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Title:
PERISTALTIC PUMP CASSETTE
Document Type and Number:
WIPO Patent Application WO/2019/106185
Kind Code:
A1
Abstract:
The present invention relates to a removable peristaltic pump cassette comprising a stator (2) configured to receive a tube (3) intended to extend from an inlet (4) to an outlet (5) of said stator (2); the cassette (1) further comprising a rotor (6) located in said stator (2); said rotor (6) comprising a driven shaft (7) configured to cooperate with a drive shaft; said rotor (6) comprises at least one roller (8) configured to move in rotation to compress a portion of said tube (3) to displace a fluid in said tube (3) from the inlet (4) to the outlet (5). The removable peristaltic pump cassette further comprises a cover (14) ensuring the closing of the stator (2), said cover (14) comprising an aperture (15) to reach the driven shaft (7) of the rotor (6). The present invention further relates to a support for a removable peristaltic pump cassette according to the present invention.

Inventors:
BLANC, Christophe (82 boulevard Bompard, Marseille, 13007, FR)
Application Number:
EP2018/083219
Publication Date:
June 06, 2019
Filing Date:
November 30, 2018
Export Citation:
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Assignee:
BLANC, Christophe (82 boulevard Bompard, Marseille, 13007, FR)
International Classes:
F04B43/12; F04B53/16; F04B53/22
Domestic Patent References:
WO2017129193A12017-08-03
WO2009042181A12009-04-02
Foreign References:
US20170184088A12017-06-29
US5518378A1996-05-21
US20010020148A12001-09-06
US20130315763A12013-11-28
US20100008755A12010-01-14
EP0885619A11998-12-23
US20040124157A12004-07-01
US3877634A1975-04-15
US5588815A1996-12-31
EP3017836A12016-05-11
EP2500569A12012-09-19
US20090053085A12009-02-26
US4558996A1985-12-17
Attorney, Agent or Firm:
ICOSA (83 avenue Denfert-Rochereau, Paris, 75014, FR)
Download PDF:
Claims:
CLAIMS

1. Removable peristaltic pump cassette (1) comprising a stator (2) configured to receive a tube (3) intended to extend from an inlet (4) to an outlet (5) of said stator (2), the cassette (1) further comprising a rotor (6) located in said stator (2), said rotor (6) comprising:

a driven shaft (7) configured to cooperate with a drive shaft (22), at least one roller (8) configured to move in rotation to compress a portion of said tube (3) to displace a fluid in said tube (3) from the inlet (4) to the outlet (5),

the peristaltic pump cassette (1) being characterized in that it comprises a cover (14) ensuring the closing of the stator (2), said cover (14) comprising an aperture (15) to reach the driven shaft (7) of the rotor (6).

2. Removable peristaltic pump cassette according to claim 1, characterized in that said cassette further comprises a pattern to be identified by a reader.

3. Removable peristaltic pump cassette according to claim 1 or claim 2, characterized in that the stator (2) comprises a frame wall (21) positioned to compress the tube against the at least one roller (8).

4. Removable peristaltic pump cassette (1) according to claim 3, characterized in that said frame wall (21) comprises a curves portion in order to guide the tube (3) circularly around the axis of the driven shaft (7) of the rotor (6).

5. Removable peristaltic pump cassette (1) according to any of the claims 1 to 4, characterized in that the rotor (6) comprises at least one support arm (9) comprising the at least one roller (8), said roller (8) being maintained with at least one degree- of-freedom in rotation.

6. Removable peristaltic pump cassette (1) according to any of the claims 1 to 5, characterized in that the inlet (4) and / or the outlet (5) comprise a maintaining groove (11) of a joint (10) comprising a protrusion (12) on its circumference to cooperate with said groove (11).

7. Removable peristaltic pump cassette (1) according to any of the claims 1 to 6, characterized in that the inlet (4) and / or the outlet (5) comprise a mobile part (13) forming a flap to maintain the tube (3).

8. Removable peristaltic pump cassette (1) according to any of the claims 1 to 7, characterized in that the rotor (6) comprises a guiding means to guide and maintain said tube in the stator (2).

9. Removable peristaltic pump cassette (1) according to claim 8, characterized in that the guiding means is a part of the at least one support arm (9).

10. Removable peristaltic pump cassette (1) according to any of the claims 1 to 9, characterized in that said removable peristaltic pump cassette is disposable.

11. Peristaltic pump head (100) characterized in that it comprises a removable peristaltic pump cassette (1) according to any of the claims 1 to 10, said head (100) being also equipped with a centrifugation device (110) comprising:

a base surface (111) in contact with the cassette cover (14), said base surface (111) comprising an aperture (112) positioned facing the aperture (15) of the cassette cover (14),

a driven shaft (114) aligned along the axis of the aperture (112) of the base surface (111), and intended to cooperate with a drive shaft so as to rotate at least part of the centrifugation device (110),

said head (100) further comprising attachment means configured to hold the centrifugation device (110) in a stable position on the cassette cover (14).

12. Peristaltic pump head (100) according to claim 11, characterized in that the cassette (1) and the centrifugation device (110) are in fluid communication, so that a liquid intended to be pumped into the cassette (1) is then conveyed to the centrifugation device (110).

13. Peristaltic pump head (100) according to any of the claims 11 to 12, characterized in that the centrifugation device (110) comprises an outer shell (113):

configured to remain in a fixed position during operation of the centrifugation device (110),

- part of which is formed by the base surface (111), and

within which is arranged an inner bowl (115) configured to cooperate with the driven shaft (114), so as to centrifuge a liquid intended to be conveyed within said inner bowl (115).

14. Peristaltic pump head (100) according to any of the claims 11 to 13, characterized in that it comprises prehension means configured to simultaneously handle and move the cassette (1) and the centrifuge device (110).

15. Peristaltic pump head (100) according to claim 14, characterized in that the prehension means comprise a handle (117) cooperating with at least the centrifugation device (110). 16. Support (18) characterized in that it comprises a pump housing intended to house a peristaltic pump head (100) according to any of the claims 11 to 15, said support (18) comprising a floating head (170) comprising drive means configured to cooperate with the driven shafts (7, 114) of said peristaltic pump head (100).

17. Support (18) according to claim 16, characterized in that said drive means comprise two drive shafts, a first drive shaft (171) and a second drive shaft (172) respectively intended to cooperate with the driven shafts (7, 114) of the cassette (1) and of the centrifugation device (110) of the peristaltic pump head (100), the second drive shaft (172) being positioned inside the first drive shaft (171) in a substantially concentric manner so that their respective rotational movements are independent, the drive means further comprising two motors configured to respectively drive the first and second drive shafts (171, 172).

18. Support (18) for a removable peristaltic pump cassette characterized in that it comprises: a floating head (17) comprising a drive shaft (22) and a motor (16) to drive said drive shaft (22);

a pump housing (19) configured to house a removable peristaltic pump cassette (1), said cassette (1) comprising a rotor (6) located in a stator (2) and comprising a driven shaft (7) configured to cooperate with the drive shaft (22) of the floating head (17);

the support (18) being characterized in that said pump housing (19) is movable from a first retracted position to a second position, so that the drive shaft (22) of the floating head (17) cooperates with the driven shaft (7) of the cassette (1) when the pump housing is in the second position.

19. Peristaltic pump characterized in that it comprises a tube (3) and:

either a support (18) according to any of the claims 16 to 17, and a peristaltic pump head (100) according to any of the claims 11 to 15,

or a support (18) according to claim 18, and a removable peristaltic pump cassette (1) according to any of the claims 1 to 10.

20. Peristaltic pump according to claim 19, characterized in that the support (18) comprises a pattern reader configured to read a pattern located on the cassette (1).

21. Peristaltic pump according to any of the claims 19 and 20, characterized in that the tube (3) is made of silicone.

Description:
PERISTALTIC PUMP CASSETTE

FIELD OF INVENTION

The present invention pertains to the field of the peristaltic pumps. In particular, the invention relates to a peristaltic pump cassette and its support.

BACKGROUND OF INVENTION

Peristaltic pump is a displacement pump used for pumping a variety of fluids. The fluid is contained within a flexible tube fitted inside a circular pump casing. A rotor with a number of rollers attached to the external circumference of the rotor compresses the flexible tube so as to generate an occlusion of the tube. As the rotor turns, the part of the tube under compression is pinched closed thus forcing the fluid to be pumped to move through the tube. This process is used in many biological systems to pump clean or sterile fluids without exposing those fluids to contamination from exposed fluid components. Peristaltic pumps are also used in a wide variety of industrial applications in order to pump abrasives and viscous fluids.

The peristaltic pump may generally include a pump body comprising a rotor driven by a motorized drive shaft and a cassette removably attached thereto, and a tube supported by the cassette. For example, such a pump is described in document W02009/042181.

A main drawback of these systems is the time needed and the difficulty to easily and safely mount a pump.

Indeed, there is a risk when the pump is not well mounted that the pressure of the roller cannot indicate a real situation of a patient assistance. In case of a critical situation, there is a need to control precisely the flow rate of the pump. For example, if the occlusion of the tube is too high or too low, the flow rate will not be the expected flow rate. This disorder can lead to dramatic situations. In a second example, the tube may be mounted in the wrong direction. In said situation, if the pump push back instead of suck the blood up from the aorta, the consequence is fatal for the patient. A second drawback raised with the peristaltic pumps of the state of the art, is the number of manipulations needed to assemble, and configure the components of the pump between two consecutive uses of said pump. In this phase, the medical staff is particularly requested and an error may be made during these transitional steps. Furthermore, the risk of incorrect setting such as an incorrect occlusion of the tube may lead to a poor sealing.

Moreover, there is a risk in the different manipulations, that the medical staff encounters a risk to be injured. Indeed, in many applications of pump, hospital staff have to dispose a new tube between the wall of the frame and the rollers and adjust the distance between the rollers to reach the good occlusion of the tube. During this operation, the risk of injury is high, especially for a person unaccustomed with such a pump.

Finally, yet another risk associated with peristaltic pumps of the previous art comes from the fact that these pumps operate on electrical energy. Therefore, if a power outage occurs, the consequences can be dramatic for a patient because the medical profession remains dependent on a new supply of electrical energy. There is a need of a secured peristaltic pump easy to mount, whose handlings between two successive uses are minimized, and increases patient safety in the event of a power outage without increasing the risks for the medical profession in return.

SUMMARY The present invention relates to a removable peristaltic pump cassette comprising a stator configured to receive a tube intended to extend from an inlet to an outlet of said stator; the cassette further comprising a rotor located in said stator; said rotor comprising a driven shaft configured to cooperate with a drive shaft; said rotor comprises at least one roller configured to move in rotation to compress a portion of said tube to displace a fluid in said tube from the inlet to the outlet. Moreover, the peristaltic pump cassette comprises a cover ensuring the closing of the stator, said cover comprising an aperture to reach the driven shaft of the rotor. One advantage of the invention is to allow a user to mount easily and safely the cassette in a support and to initiate easily the peristaltic pump without adjustment from the user. Each cassette may be addressed for a specific application or a specific need.

Another advantage of the invention is that, when the cover is closed, the rotor, the roller and the tube are not available for the user, avoiding the risk of injuries.

Still another advantage of the invention is to allow the user to open the aperture located on the cover and to insert a crank in the driven shaft to provide energy rotating the rotor without electricity.

Such arrangements are particularly advantageous in the event of a shut-down of the electrical system leading to a power interruption. In this way, the risks are greatly reduced not only for the patient but also for the user.

In one embodiment, the cassette is disposable. In one embodiment, the stator and / or the rotor are made of plastic material.

In one embodiment, said cassette further comprising a pattern to be identified by a reader. The pattern allows the cassette to be advantageously identified. Then, a configured calculator may determine the rotation speed of the rotor. This configuration allows reaching a targeted flow rate of the fluid comprised in the tube. In another example, a configured calculator may determine the flow rate. This configuration allows reaching a targeted rotation speed of the rotor. In one embodiment, the stator comprises a frame wall positioned to compress the tube against the at least one roller. In one embodiment, the frame wall comprising a curves portion in order to guide the tube circularly around the axis of the driven shaft of the rotor.

In one embodiment, the rotor comprising at least one support arm comprising the at least one roller, wherein said roller is maintained with at least one degree-of-freedom in rotation. In one embodiment, the inlet and / or the outlet comprise a maintaining groove of a joint comprising a protrusion on its circumference to cooperate with said groove. The joint allows connected safely an external tube 33 to the tube in the cassette.

In one embodiment, the inlet and / or the outlet comprise a mobile part forming a flap to maintain the tube.

In one embodiment, the rotor comprises a guiding means to guide and maintain said tube in the stator. In one embodiment, the guiding means is a part of the at least one support arm.

According to another aspect, the invention further relates to a peristaltic pump head comprising a removable peristaltic pump cassette according to the invention, said head being also equipped with a centrifugation device comprising:

a base surface in contact with the cassette cover, said base surface comprising an aperture positioned facing the aperture of the cassette cover, a driven shaft aligned along the axis of the aperture of the base surface, and intended to cooperate with a drive shaft so as to rotate at least part of the centrifugation device,

said head further comprising attachment means configured to hold the centrifugation device in a stable position on the cassette cover.

In one embodiment, the cassette and the centrifugation device are in fluid communication, so that a liquid intended to be pumped into the cassette is then conveyed to the centrifugation device.

In one embodiment, the centrifugation device comprises an outer shell:

configured to remain in a fixed position during operation of the centrifugation device,

- part of which is formed by the base surface, and

within which is arranged an inner bowl configured to cooperate with the driven shaft, so as to centrifuge a liquid intended to be conveyed within said inner bowl. In one embodiment, the peristaltic pump head comprises prehension means configured to simultaneously handle and move the cassette and the centrifuge device.

In one embodiment, the prehension means comprise a handle cooperating with at least the centrifugation device. According to another aspect, the invention relates to a support comprising a pump housing intended to house a peristaltic pump head according to the invention, said support comprising a floating head comprising drive means configured to cooperate with the driven shafts of said peristaltic pump head.

In one embodiment, said drive means comprise two drive shafts, a first drive shaft and a second drive shaft respectively intended to cooperate with the driven shafts of the cassette and of the centrifugation device of the peristaltic pump head, the second drive shaft being positioned inside the first drive shaft in a substantially concentric manner so that their respective rotational movements are independent, the drive means comprising two motors configured to respectively drive the first and second drive shafts. According to another aspect, the invention further relates to a support for a removable peristaltic pump cassette comprising a floating head comprising a drive shaft and a motor to drive said drive shaft; said support comprising a pump housing configured to house a removable peristaltic pump cassette, said cassette comprising a rotor located in a stator and comprising a driven shaft configured to cooperate with the drive shaft of the floating head; said support comprising at least one retractable element for cooperate the floating head with the driven shaft of the cassette.

In one embodiment, the at least one retractable element is the drive shaft of the floating head, said drive shaft being movable from a first retracted position to a second insertion position wherein the drive shaft of the floating head is inserted into said pump housing. In one alternative embodiment, the at least one retractable element is the pump housing, said pump housing being movable from a first retracted position to a second position wherein the drive shaft of the floating head is inserted into said pump housing. According to another aspect, the present invention relates to a peristaltic pump comprising a support according to the present invention and a removable peristaltic pump cassette according to the present invention, and a tube.

According to another aspect, the present invention also relates to a peristaltic pump comprising a tube, a support according to the invention, and a peristaltic pump head according to the invention.

In one embodiment, the support of the peristaltic pump comprises a pattern reader configured to read a pattern located on the cassette.

In one embodiment, the tube of the peristaltic pump is made of silicone.

DEFINITIONS

In the present invention, the following terms have the following meanings:

“Cassette”, refers to a removable closable receptacle.

“Stator”, refers to the stationary part of a rotary system.

- “Rotor”, refers to the moving component of a rotary system.

“Floating head”, refers to a head protruding from a surface, preferably from a surface of a support.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be better understood on reading the description that follows, provided by way of non-limiting example, and with reference to the drawings which represent:

Figure 1 is an exploded view of a cassette according to one embodiment of the present invention.

Figure 2 is an exploded view of the inlet and the outlet of the cassette according to one embodiment of the present invention. Figure 3 is a schematic view of the support for a cassette according to one embodiment where the retractable element is the pump housing.

Figure 4 is a schematic view of the floating head according to one embodiment of the present invention. Figure 5 is a schematic view of the floating head cooperating with the driven shaft of a cassette according to one embodiment of the present invention.

Figure 6 is an exploded view of the rotor according to tone embodiment of the present invention.

Figures 7 A and 7B are schematic view of the pump with transparent frame of the support wherein the at least one retractable element is the floating head.

Figures 8A, 8B and 8C are schematic view of the pump wherein the at least one retractable element is the pump housing.

Figure 9A is an exploded view of the cassette comprising needle roller bearing and thrust needle roller bearing.

Figure 9B is an exploded view of the rotor comprising needle roller bearing and thrust needle roller bearing.

Figure 10A and 10B is a schematic front view of an alternative embodiment of figures 7A and 7B, in which a peristaltic pump head is respectively disengaged and engaged with the floating head of a support, said head comprising a cassette according to the invention and a centrifugation device.

Figure 10C is a three-quarter view of a particularly advantageous embodiment of the peristaltic pump head illustrated in Fig. 10A and 10B, in which said head comprises prehension means

In these figures, references that are identical from one figure to another denote identical or analogous elements. For reasons of clarity, the elements represented are not to scale, unless stated otherwise. Moreover, the figures are not intended to limit the scope of the claims to the embodiments depicted. Accordingly, it should be understood that where features mentioned in the appended claims are followed by reference signs, such signs are included solely for the purpose of enhancing the intelligibility of the claims and are in no way limiting on the scope of the claims.

DETAILED DESCRIPTION

The following detailed description will be better understood when read in conjunction with the drawings. For the purpose of illustrating, the cassette and the support of the cassette are shown in the preferred embodiments. It should be understood, however that the application is not limited to the precise arrangements, structures, features, embodiments, and aspect shown. The drawings are not drawn to scale and are not intended to limit the scope of the claims to the embodiments depicted. Accordingly, it should be understood that where features mentioned in the appended claims are followed by reference signs, such signs are included solely for the purpose of enhancing the intelligibility of the claims and are in no way limiting on the scope of the claims.

The present invention relates to a removable peristaltic pump cassette 1, a support 18 comprising a motor to receive said cassette 1, and a peristaltic pump comprising the cassette 1 and the support 18.

According to a first aspect, the present invention relates to a removable peristaltic pump cassette 1 comprising a stator 2 and a rotor 6. The rotor 6 comprises at least one roller 8 arranged at the external circumference of said rotor 6 in order to compress a flexible tube 3. In a preferred example of realization, said tube 3 is made of silicone. The choice of such a material is particularly advantageous because it allows the tube 3 to easily return to its original shape after being compressed by the rotor 3. In this way, it is prevented that the tube bears traces as it is used, and thus damages itself. Nothing excludes, following other examples not detailed here, having other material for the tube 3. The choice of a particular material can typically result from a compromise between cost and lifespan.

In one embodiment, the stator 2 is a cassette housing. In one embodiment, the removable peristaltic pump cassette is disposable. Particularly in cardiopulmonary bypass application, elements which touch the blood cannot be reutilized.

In one embodiment, all parts of the cassette 1 are intended for single-use only. Then, the cassette 1 and its components are intended to be threw out after use.

In one embodiment, the stator 2 and / or the rotor 6 are made in plastic material.

The arrangement of the roller at the external circumference of the rotor allows compressing a portion of a tube 3 in order to displace a fluid in said tube 3 from an inlet to an outlet of the cassette 1. In one embodiment, the stator 2 defines a compartment of the cassette 1 comprising different components of the cassette 1. Said cassette 1 is configured to be inserted into a pump housing 19 of a support 18 comprising at least a floating head 17, said cassette 1 being intended to cooperate with said floating head 17. In one embodiment, the cassette 1 comprises a closed housing. One advantage is to limit the accessibility of the different elements of the cassette 1 to a user.

Said cassette 1 comprises a stator 2 on which the tube 3 is guided from an inlet 4 to an outlet 5 of the cassette 1. In one embodiment, the tube 3 is guided along a frame wall 21. Therefore, said tube 3 is made of a material which is deformable. The tube 3 is compressed between the at least one roller 8 and the frame wall 21 of the housing of the stator 2 of the cassette 1.

The rotor 6 comprises a driven shaft 7 configured to cooperate with a drive shaft 22. When the driven shaft 7 cooperates with the drive shaft 22, the rotation of the drive shaft 22 causes the rotation of the driven shaft 7.

Therefore, the removable peristaltic pump cassette 1 according to the present invention is able to be coupled to a drive shaft 22 of a floating head 17 of the support 18. The tube 3 of the cassette 1 is intended to be connected to external tubes 33 at the inlet 4 and the outlet 5. Preferably, the removable peristaltic pump cassette 1 is designed to be inserted in a pump housing 19 of a support 18, for example a drawer.

When the pump is used with blood, the tube had to be changed between each use. One advantage of the invention is to allow a user to remove easily the cassette 1 from the support 18, and choose a new cassette. Each cassette may be addressed for a specific application or a specific need. The user is able to insert a new cassette in the pump housing 19 of the support. No steps of handling tubes, especially the tube 3 of the housing of the cassette 1, rollers, or a rotor is then needed. This simplification avoids any risk of injury or any risk of incorrect setting or adjustment during the assembly which could disturb the pump to operate.

Fig. 1 describes a removable peristaltic pump cassette 1 comprising a rotor 6 and a stator 2. The stator 2 comprises a frame wall 21 which ensures guiding a tube 3. In one embodiment, the removable peristaltic pump cassette 1 further comprise a pattern 30.

In this example illustrated on Fig. 6, two rollers 8 are connected to a support arm 9 by a longitudinal element 81 configured to maintain a roller 8. The support arm 9 comprises a lower arm 91 and an upper arm 90 arranged in opposite each other. In one embodiment, the lower arm 91 and the upper arm 90 comprise each one at least one aperture 92 arranged respectively one above the other. In this example, two apertures 92 are facing each other so that the longitudinal element 81 may be introduced in each of the apertures. In one embodiment, a stopper 82 allows longitudinal element 81 to stay in position in said two apertures 92. One advantage is to realize a solid fixation of the roller 8.

Each roller may comprise a hollow cylindrical profile in order to receive the longitudinal element 81 inside the hollow. One advantage is to configure a slightly smaller diameter of the longitudinal element 81 than the diameter of the hollow of the roller 8. In this case the roller 8 may turn on itself and thus facilitate its contact with the tube 3, especially when the tube is introduced in the cassette 1. In one embodiment, the roller diameter is predefined, depending on the tube diameter, to produce an optimal occlusion of said tube 3. In one embodiment, the support arm 9 comprises the at least one roller 8 and maintains the at least one roller 8 with at least one degree-of-freedom, preferably in rotation. The advantage is the at least one roller 8 is able to compress a portion of the tube without friction between the roller 8 and the tube 3. The rotor 6 further comprises a driven shaft 7 configured to cooperate with a drive shaft 22 of a support 18.

In one embodiment, the driven shaft 7 comprises a hollow center. In one embodiment, the driven shaft 7 comprises tooth configured to cooperate with tooth 23 of a drive shaft 22. In an alternative embodiment non-illustrated, the driven shaft 7 is configured to be inserted into a hollow center of a drive shaft 22 of a support. In on embodiment, the driven shaft 7 protruding from the stator 2. In one embodiment, the cassette 1 comprises a tube 3 extending from an inlet 4 to an outlet 5. In one embodiment, the inlet 4 and / or the outlet 5 comprise a joint 10 configured to connect the tube 3 of the cassette 1 to another tube outside the cassette.

As illustrated on Fig. 2, the joint 10 comprises a hollow cylinder with an outside diameter substantially equal to the inner diameter of the tube 3 in order to insert said joint inside the tube 3. In another embodiment non-illustrated, the joint 10 comprises a hollow cylinder with an inner diameter substantially equal to the outer diameter of the tube 3 in order to insert the tube 3 inside the hollow cylinder of the joint 10. In one embodiment, the joint further comprise a protrusion 12. The advantage of this protrusion 12 is double: firstly, it acts like an abutment for the tube 3 when the joint 10 is inserted into the tube 3 and secondly it is configured to cooperate with a groove 11 of the inlet 4 or the outlet 5 to maintain the tube 3 in said inlet 4 or in said outlet 5. In one embodiment, the inlet 4 and / or the outlet 5 further comprise a maintaining groove 11 to cooperate with the protrusion 12 of the joint 10. In one embodiment, the joint 10 further comprise a second hollow cylinder extending from the cassette 1 in order to connect another external tube 33 to the inlet 4 and / or the outlet 5.

In one embodiment, the inlet 4 and / or the outlet 5 further comprises a mobile part 13 forming a flap to maintain the tube 3 or to maintain the joint 10 in the inlet 4 or in the outlet 5. In one alternative embodiment non-represented, the tube 3 protrudes from the exterior of the stator 2. In one embodiment, the tube 3 stick out from the inlet 4 and / or the outlet 5. In one embodiment, the inlet and / or the outlet comprise a plastic ring arranged at the circumference of the inlet and / or the outlet. Said plastic ring allows maintaining the tube in a predefined position.

In one embodiment, the rotor 6 further comprises guiding means configured to rotate with the roller 8 and maintaining the tube in the working position before and / or after the passage of the roller 8. In one embodiment, the support arm 9 comprises said guiding means. In another embodiment non-illustrated, the guiding means extending radially from the driven shaft 7 of the rotor 6. In one embodiment, said guiding means maintain the tube 3 in the stator 2. In one embodiment, said guiding means is a part of the at least one support arm 9. In one embodiment, said guiding means is the lower arm 91 and / or the upper arm 90 of the support arm 9.

In one embodiment, the cassette 1 comprises a cover 14 ensuring the closing of the stator 2. In one embodiment, when the cover is closed, the rotor 6, the roller 8 and the tube 3 are not available for the user, avoiding the risk of injuries. In one embodiment, said cover 14 comprises an aperture 15 to reach driven shaft 7 of the rotor 6. In one embodiment, said aperture 15 allows reaching the hollow center of the driven shaft 7 or to reach the tooth of the driven shaft 7. The advantage is to provide a security in case of a shut-down of the electrical system. In said embodiment, in case of power failure or in case of power interruption, the user is able to open the aperture and to insert a crank in the driven shaft to provide energy rotating the rotor without electricity.

In one embodiment, the cover 14 is transparent. In one embodiment, the cover 14 is made of plastic material. In one embodiment, the cover 14 is made of polycarbonate, polystyrene, or acrylonitrile butadiene styrene (also called ABS).

In one embodiment, the cassette 2 comprises a frame wall 21 positioned to guide the tube 3. In one embodiment, the at least one roller 8 is configured to press the tube against the frame wall 21. In one embodiment, said frame wall 21 comprises a curve portion in order to guide the tube 3 circularly around the axis of the driven shaft 7 of the rotor 6. In one embodiment non-illustrated, the portion of the frame wall 21 compressing the tube 3 against the roller 8 is straight. In one embodiment, said frame wall 21 is comprised in the stator 2.

In one embodiment, the cassette 1 further comprises a pattern 30. In one embodiment, the cassette 1 comprises a pattern 30 on its external surface. In one embodiment, said pattern 30 allows associating the cassette 1 with a tube diameter.

An information of the context of use is read on the pattern by an electronical or optical reader. The information is automatically read by the reader. It allows a user, such as medical staff, to understand the context of the configuration of the pump needed. An interface may be integrated in the pump or in another equipment in order to read the information decoded by the reader. The user who configures the pump may control the pressure, the flow rate or the speed rotation of the rotor according to a predefined setting.

In one embodiment, said user can adjust the speed rotation to reach a predefined speed flow. In one embodiment, said user can adjust the speed rotation to reach an optimal flow. In one embodiment, the interface comprises a button or a potentiometer to modify the speed rotation.

In one embodiment, the pattern 30 is a machine-readable label that contains information about the cassette 1 to which it is attached. In one embodiment, said information comprise the outside diameter of the tube 3 of the cassette. In one embodiment, said information comprise the inside diameter of the tube 3 of the cassette 1.

In one embodiment, said information comprise the pressure exerted by the roller 8 on the tube 3. In one embodiment, said information comprise the gap between the roller 8 and the frame wall 21 determining the squeeze applied on the tube 3.

In one embodiment, said information allow calculating the flow rate of the peristaltic pump. In one embodiment, said information allow calculating the flow rate of the peristaltic pump depending of the rotation speed of the rotor 6 or depending of the number of revolution per minute of the rotor 6. In one embodiment, said information allow calculating the flow rate depending of the rotation speed chosen by the user via the interface.

In one embodiment, said information comprise the number of rollers 8. In one embodiment, said information comprise the length of the tube 3 measured from the inlet 4 to the outlet 5.

In one embodiment, said pattern 30 is an optical label. In one embodiment, the optical label is characterized by its size, its shape or its color. In one embodiment, the optical label is a barcode. In one embodiment, the optical label is a quick response code (commonly called QR code). In one embodiment, the visual label is a matrix barcode. In one embodiment, said pattern 30 is a three-dimensional or a mechanical pattern. In one embodiment, said pattern 30 is a geometric shape or a size. In one embodiment, said pattern 30 is a pin which can be inserted in a specific housing. In one embodiment, said pattern 30 is the location of a pin in the exterior surface of the cassette.

The pattern 30 allows the cassette to be advantageously identified. Then, a calculator determines the flow applied to the fluid based on the rotation speed of the pump.

The rotation speed of the rotor may be determined by the user to reach the optimal flow.

This configuration allows reaching a targeted flow rate of the fluid comprised in the tube 3. In another example, a configured calculator may determine the flow rate. This configuration allows reaching a targeted rotation speed of the rotor 6.

According to a second aspect, the present invention also relates to a support for a cassette. In one embodiment illustrated on Fig. 3, said support 18 comprises a floating head 17.

In one embodiment, the support 18 further comprises a pump housing 19 configured and dimensioned to receive or to house a removable peristaltic pump cassette 1 to cooperate with the drive shaft 22 of the floating head 17. In one embodiment illustrated on Fig. 4, the floating head 17 comprises a drive shaft 22 and a motor 16 connected to said drive shaft 22.

In one embodiment, at least a part of the floating head 17 is protruding in the pump housing 19. In one embodiment, at least a part of the drive shaft 22 is protruding in the pump housing 19.

In one embodiment, the drive shaft 22 of the floating head 17 is configured to cooperate with a driven shaft of a cassette.

In one embodiment, the drive shaft 22 is coupled to a motor 16. In one embodiment, the motor 16 of the support 18 transmits rotating movement to the drive shaft 22 of the floating head 17. In one embodiment, the support 18 comprises a frame 31 and the floating head 17. In one embodiment, at least a part of the floating head 17 is protruding from the frame 31 of the support 18. In one embodiment, the drive shaft 22 is on a distal part of the floating head 17. By distal, it should be understood here spaced from the attachment point with the frame 31 of the support 18.

In one embodiment (non-represented), the pump housing 19 is located on the top surface of the support 18. In said embodiment, the pump housing 19 is accessible to the cassette 1 so that the cassette 1 can be mounted on the floating head 17 by a translation displacement in the direction of the rotation axis of the drive shaft 22 of the floating head 17. In an alternative embodiment, said support 18 comprises at least one retractable element for cooperate the floating head 17 with the driven shaft 7 of the cassette 1.

One advantage of the retractable element is to provide a peristaltic pump wherein the cassette 1 is at least in part surrounded by walls of the pump housing 19.

When the cassette 1 is at least in part surrounded by walls, the cassette is advantageously maintained by said walls and the stress on the floating head 17 during use is reduced. The reduction of the stress in the floating head 17 improves the durability of the floating head 17 and the durability of the support 18.

In one embodiment illustrated on Figs. 7A and 7B, the at least one retractable element is the drive shaft 22 of the floating head 17. In said embodiment, the drive shaft 22 is movable from a first retracted position to a second insertion position wherein the drive shaft 22 of the floating head 17 is inserted into said pump housing 19. In one embodiment, the floating head 17 comprises at least one element ensuring the translation of the drive shaft 22 among but not limited to a spring or a protrusion in a groove.

In one embodiment, the cassette 1 is designed to be inserted into the pump housing 19 (e.g. by translation) when the drive shaft 22 of the floating head 17 is in the first retracted position (Fig. 7A). Once the cassette 1 inserted into the pump housing 19, the driven shaft 7 of the cassette is configured to be positioned in front of the drive shaft 22. Then, the drive shaft 22 is moved from the first retracted position to the second insertion position wherein the drive shaft 22 of the floating head 17 cooperates with the driven shaft 7 of the cassette 1 (Fig. 7B).

In one embodiment illustrated on Fig. 8A - 8C, the at least one retractable element is the pump housing 19, said pump housing 19 being movable from a first retracted position (Fig. 8A and 8B) to a second position wherein the drive shaft 22 of the floating head 17 is inserted into said pump housing 19 (Fig. 8C). In one embodiment, the support 18 comprises means to ensure a displacement of the pump housing 19 from a first retracted position to a second position.

In one embodiment, the support 18 comprises at least one groove and the pump housing 19 comprises at least one protruding element configured to be movable along said groove of the support 18 (or inversely). This groove and this protruding element ensures the displacement of the pump housing 19 in regard with the support 18. In one embodiment, the support comprising a slider in which the pump housing 19 is able to slide.

In one embodiment, said removable peristaltic pump cassette is the removable peristaltic pump cassette according to the first aspect of the present invention. In one embodiment, the pump house of the support 18 further comprises a reader 32 able to read the pattern of the cassette 2 described above. In one embodiment, the support 18 comprises a software and / or a database determining the flow rate of the liquid in the tube 3. In one embodiment, the support comprises 18 a software and / or a database determining the rotation speed of the rotor.

In one embodiment, this determination is automatically engaged with the reading of the pattern of the cassette.

In one embodiment, said pump housing is a receptacle, a compartment or a container.

According to a third aspect, the present invention further related to a peristaltic pump comprising a support according to the second aspect and a removable peristaltic pump cassette according to the first aspect of the present invention.

In one embodiment, said peristaltic pump further comprises a tube 3.

In one embodiment, the cassette 1 is configured to be inserted in the pump housing 19. In one embodiment, the drive shaft 22 is located on the pump house such as to cooperate with the driven shaft 7 of the cassette when said cassette is inserted in the pump housing 19.

Fig.5 illustrates one embodiment of a mechanical cooperation between the floating head 17 of the support 18 and the driven shaft 7 of the cassette 1. In said embodiment, the floating head 17 comprises a drive shaft 22, a motor shaft 24, and a spring 26. In one embodiment, said spring 26 is located between the drive shaft 22 and the motor shaft 24. In one embodiment, the spring 26 is configured, when being uncompressed, to separate the drive shaft 22 from the motor shaft 24. This separation allows facilitating the introduction of the floating head 17 into the driven shaft 7 of the cassette 1. Advantageously, this configuration allows introducing a mechanical clearance by rotating the floating head 17 in order to guide the teeth of the drive driven shaft 7 into those 27 of the cassette 1.

In one embodiment, the drive shaft 22 comprises teeth 23 cooperating with the teeth of the driven shaft 7 of the rotor 6. In one embodiment, the teeth 23 of the drive shaft 22 comprises a distal chamfer 27 on their distal end. The distal chamfer 27 advantageously slide on the teeth of the driven shaft 7 until the embedment of the teeth 23 of the drive shaft 22 in the driven shaft 7.

In one embodiment, the motor shaft 24 comprises teeth 25. In one embodiment, the drive shaft 22 and the motor shaft 24 are configured to cooperate each other when the spring 26 between them is compressed. In one embodiment, when the floating head 17 cooperates with the driven shaft 7, the spring 26 is compressed and the teeth 23 of the drive shaft 22 cooperates with the teeth 25 of the motor shaft 24. In one embodiment, the proximal end of each tooth of the drive shaft 22 comprises a chamfer 28 improving the embedment of each tooth 23 of the drive shaft 22 between two successive teeth 24 of the motor shaft 25. In one embodiment, the teeth 25 of the motor shaft 24 also comprise chamfers 29 on their distal end improving the embedment of the teeth 23 of the drive shaft 22 in the spaces defined between two successive teeth 24 of the motor shaft 25.

In one embodiment, the driven shaft 7 comprises an abutment or an abutment ring 20 configured to stop the displacement of the teeth 23 of the drive shaft 22 in the driven shaft 7.

In one embodiment, the cassette further comprises means to reduce the friction between the driven shaft 7 and the stator 2.

In one embodiment illustrated on Fig. 9A, the cassette 1 further comprises at least one thrust needle roller bearing 35 and / or at least one needle roller bearing 34. In one embodiment, said thrust needle roller bearing 35 is located between the driven shaft 7 and the cover 14 and / or between the driven shaft 7 and the part of the stator 2.

As illustrated on Fig. 9B, the at least one thrust needle roller bearing 35 and the at least one needle roller bearing 34 are concentric with the driven shaft 7. The at least one thrust needle roller bearing 35 avoid the gap between the driven shaft 7 and the stator 2 or between the driven shaft 7 which limit a vertical displacement of the driven shaft 7. Furthermore, the at least one thrust needle roller bearing 35 and the at least one needle roller 34 avoid the friction between the stator 2 and the driven shaft 7 or between the cover 14 and the driven shaft 7.

In one embodiment, said at least one needle roller bearing 34 is arranged in a portion of the stator 2 having a cylinder shape. Then, the at least one needle roller bearing 34 ensures that the friction between the driven shaft 7 and the wall of said portion of the stator is reduced.

The at least one needle roller bearing 34 further limits the horizontal displacement of the driven shaft 7. By“vertical”, it should be understood along the rotation axis of the driven shaft 7. By “horizontal”, it should be understood along an axis perpendicular to the rotation axis of the driven shaft 7.

According to another aspect, the invention relates to a peristaltic pump head 100. Such a head 100 is configured not only to pump a liquid, such as blood, but also to centrifuge the same liquid or a different one, and thus forms an alternative embodiment of the invention described above, the support for this head 100 and the associated peristaltic pump being modified accordingly and as described below.

The figures 10A and 10B schematically illustrate said alternative embodiment, in which the peristaltic pump head 100 is housed in a support configured for this purpose, said peristaltic pump head 100 comprising not only a cassette 1 with an aperture 15 according to the invention but also a centrifugation device 110.

In particular, Figures 10A and 10B show a front view of a floating head 170 of the support on which the peristaltic pump head 100 is disengaged and engaged respectively. It should be noted that Figures 10A and 10B are schematic illustrations in that the only element of the support that is shown is the floating head 170. It will appear obvious to the skilled person in the art that the support of this alternative embodiment cannot be limited to the presence of this floating head 170 alone. Thus, all the characteristics of the support described above, for example those related to Fig. 7A, 7B, 8A, 8B and 8C, may form part of the support relative to said alternative embodiment.

The centrifugation device 110 of the peristaltic pump head comprises a base surface 111 in contact with the cassette cover 14, said base surface 111 comprising an aperture 112 positioned facing the aperture 15 of the cassette cover 14.

As illustrated in a non-limiting way in Fig. 10A and 10B, said base surface 111 is configured to conform to the surface of the cassette cover 14 and extends to the contours of said cover 14. According to this configuration, the cassette 1 forms a baseplate on which the centrifugation device 110 is supported. The base surface 111, for its part, forms part of an outer shell 113 of the centrifuge device 110. Advantageously, the part of the outer shell 113 that does not include the base surface 111 extends vertically from the base surface 111 by extending the lateral edges of the cassette 1. In this way, the peristaltic pump head 100 has a uniform appearance, without roughness, and can therefore be easily inserted into a housing provided in the. By way of a non-limiting example illustrated on Fig. 10A and 10B, the outer shell 113 is designed so that the peristaltic pump head 100 is substantially kettle- shaped. However, nothing excludes having a different configuration of the base surface 111 as well as the shape of the peristaltic pump head 100, as long as the centrifuge device 110 is supported on the cassette 1, the objective remaining that the centrifuge device 110 and the cassette 1 are substantially aligned at their respective apertures 15, 112.

The centrifugation device 110 further comprises a driven shaft 114 aligned along the axis of the aperture 112 of the base surface 111, and intended to cooperate with a drive shaft so as to rotate at least part of the centrifugation device 110. As illustrated in Fig. 10A, the driven shaft 114 of the centrifugation device 110 is arranged to extend in the axis of the floating head 170 of the support. In this example, said driven shaft 114 does not pass through the aperture 112 of the base surface 111 and therefore remains within the volume delimited by the outer shell 113. Nothing excludes having another configuration in which the driven shaft 114 extends outside the volume delimited by the outer shell 113. In a particular embodiment, the outer shell 113 is configured to remain in a fixed position during operation of the centrifugation device 110. By“fixed position”, one refers here to the fact that the outer shell 113 does not rotate when the centrifugation device 110 is in motion. In this embodiment, an inner bowl 115 is arranged within said outer shell 113 and is configured to cooperate with the driven shaft 114, so as to centrifuge a liquid intended to be conveyed within said inner bowl 115. For example, and as illustrated in Fig. 10A and 10B, the inner bowl 115 is bell-shaped and thus corresponds to a surface of revolution whose axis of revolution is aligned with the driven shaft 114. A drive disc 116 is positioned at the lower part of the inner bowl 115, so that it faces the respective apertures of the cassette cover 14 and of the base surface 111. Said drive disc 116 is configured in a manner known per se to cooperate with the driven shaft 114 as well as with the inner bowl 115 to rotate the latter when the driven shaft 114 is in motion. It will also be obvious for the skilled person in the art that other elements configured to obtain a rotational movement, such as bearings, can be used in addition or not to the drive disc 116.

It should be noticed that having an outer shell 113 housing an inner bowl 115 is only a variant of realization for the centrifugation device 110, and therefore in the end for the peristaltic pump head 100. Thus, nothing excludes, for example, having a centrifugation device 110 comprising only a bowl 115 (i.e. without outer shell) whose base is kept at a predetermined distance from the cassette cover 14 so that it can rotate independently of the latter.

As mentioned above, the centrifugation device 110 and the cassette 1 can be operated with the same liquid. For this purpose, and according to a particular embodiment, the cassette 1 and the centrifugation device 110 are in fluid communication, so that a liquid intended to be pumped into the cassette 1 is then conveyed to the centrifugation device 110, for example inside the inner bowl 115. By being“in fluid communication”, one refers here to the fact that the liquid pumped into the cassette 1 is then conveyed via a hydraulic network, for example formed by tubes, to the centrifuge device 110. For example, in the case where the liquid concerned is blood, transferring the pumped blood to the centrifuge device 110 allows the latter to be washed and the red blood cells to be concentrated following a rotation movement at high speed, typically between 3000 and 5000 rpm (revolutions per minute). Once these operations have been performed, the blood can be evacuated to an external bag for storage. It should be noted that the type of liquid that may circulate in the cassette 1 and/or in the centrifugation device 110 does not constitute a limitation of the invention. Thus, any type of liquid can be considered, such as a physiological serum, a washing solution, etc.

Moreover, the skilled person in the art knows how to build such a hydraulic network, i.e. he knows which tubes are used and how they should be arranged and used to perform operations such as those described above. In addition, the peristaltic pump head 100 comprises attachment means configured to hold the centrifugation device 110 in a stable position on the cassette cover 14. The attachment means (not illustrated on the figures) can be of any type, such as screwing, clamping, gluing, welding, clipping, etc. In this way, it is possible to move the peristaltic pump head 100 without the cassette 1 and centrifuge device 110 disengaging from each other. In a more specific embodiment, the attachment means are reversible, so that the cassette 1 can be separated from the centrifuge device 110, for example when at least one of these elements 1, 110 is defective and it is desired to replace it.

In comparison with the state of the art, the configuration of the present invention makes it advantageous to have an all-in-one system formed by the combination of the cassette 1 and the centrifuge device 110. Indeed, the configurations known until now separated the cassette from the centrifuge device, which required a complex geometry of the arrangement of these elements in close proximity to each other, and therefore also numerous and potentially dangerous manipulations to connect them. In the context of this invention, these risks are thus eliminated since the assembly of the cassette 1 with the centrifugation device 110 can be carried out upstream of the assembly of the peristaltic pump head 100 with the support. The pre-assembled head 100 forms a ready- to-use unit, which can therefore be handled safely.

Figure 10C shows a three-quarter view of a particularly advantageous embodiment of the peristaltic pump head 100 illustrated in Fig. 10A and 10B, in which said head 100 comprises prehension means configured to simultaneously handle and move the cassette 1 and the centrifuge device 110. These prehension means make it easier to move the head 100. Thus, once the cassette 1 has been assembled with the centrifugation device 110 to form said head 100, a user can grasp said prehension means, preferably with one hand, in order to transfer the head 100 very easily from an initial position, for example outside a support of a peristaltic pump, to a final position, for example in a housing of this support.

For example, the prehension means comprise a handle 117 cooperating with at least the centrifugation device 110. As illustrated on Fig. 10C, said handle 117 substantially forms an arc of a circle extending in a vertical plane, and has two extremities respectively attached to the upper part (i.e. the part which is furthest from of the cassette 1) and the lower part (i.e. the part which is nearest to the cassette 1) of the centrifugation device 110.

It will be clear to the skilled person in the art that such a configuration of the prehension handle 117 is only a variant of realization. Nothing excludes, for example, having a handle with one extremity attached to the cassette so that the handle can also be used as a holding mean between the cassette and the centrifugation device.

As mentioned before, the peristaltic pump head 100 is associated with a support configured to house and operate it, and corresponds to a variant of the support described in reference to Fig. 7A, 7B, 8A, 8B and 8C. To this end, the support comprises a pump housing (not illustrated on Fig. 10A and 10B) intended to house the peristaltic pump head 100 according to the invention. Said support also comprises a floating head 170 comprising drive means configured to cooperate with the driven shafts 7, 114 of said peristaltic pump head 100. In this way, the drive means allow not only the cassette rotor 6 but also the centrifugation device 110 to be rotated.

In a particular embodiment, said drive means comprise two drive shafts, a first drive shaft 171 and a second drive 172 shaft respectively intended to cooperate with the driven shafts

7, 114 of the cassette 1 and of the centrifugation device 110. The second drive shaft 172 is positioned inside the first drive shaft 171 in a substantially concentric manner so that their respective rotational movements are independent. For example, and as illustrated in Figs. 10A and 10B, the drive shafts 171, 172 of the floating head 170 are substantially cylindrical in shape, the second drive shaft 172 being inserted coaxially into the first drive shaft 171 without touching the inner walls of the latter. This second drive shaft 172 is positioned so as to pass through the aperture 15 of the cassette cover 14 and also the aperture 112 of the base surface 111 of the centrifugation device 110. The second drive shaft 172 also has an extremity configured to cooperate with the drive disc 116 of the inner bowl 115, the transmission of the rotational movement being carried out upon the cooperation between the drive disc 116 and this extremity of the second drive shaft 172. Having independent rotation between the first and second drive shafts 171, 172 is particularly advantageous because it allows different rotation speeds between the cassette rotor 6 and the centrifugation device 110. To this end, the drive means further comprise two motors (not illustrated in the figures) configured to respectively drive the first and second drive shafts 171, 172. In a preferred example of realization, the motor associated with the first drive shaft 171 is configured so that the rotational speed of the cassette rotor 6 is between 1 and 100 rpm. The motor associated with the second drive shaft 172 is for its part configured so that the speed of rotation of the inner bowl 115 is between 3000 and 5000 rpm. Nothing excludes, following other examples not detailed here, having different speed ranges for these motors. In particular, these speed ranges are determined by the skilled person in the art according to the intended application, i.e., in particular, whether the liquid pumped into the cassette is intended to be centrifuged.

In correspondence with the peristaltic pump head 100 and the support as described above, the invention also concerns, in another aspect, a peristaltic pump comprising a tube as well as such a head and support. Here again, in a particular embodiment, the support comprises a pattern reader configured to read a pattern located on the cassette.

While various embodiments have been described and illustrated, the detailed description is not to be construed as being limited hereto. Various modifications can be made to the embodiments by those skilled in the art without departing from the true spirit and scope of the disclosure as defined by the claims. In particular, the invention was described by considering a peristaltic pump head formed by a cassette and a centrifugation device. However, following other examples, nothing excludes to consider a peristaltic pump head formed by a stack of cassettes meeting the characteristics of cassette according to any of the embodiments described.

REFERENCES

1 - Cassette

2 - Stator

3 - Tube

4 - Inlet

5 - Outlet

6 - Rotor

7 - Driven shaft

8 - Roller

9 - Support arm

10 - Joint

11 - Maintaining groove

12 - Protrusion

13 - Mobile part

14 - Cover

15 - Aperture

16 - Motor

17 - Floating head

18 - Support

19 - Pump housing

20 - Abutment ring

21 - Frame wall

22 - Drive shaft

23 - Teeth of the drive shaft 24 - Motor shaft

25 - Teeth of the motor shaft

26 - Spring

27 - Chamfer of the distal end of the drive shaft

28 - Chamfer of the proximal end of the drive shaft

29 - Chamfer of the distal end of the motor shaft

30 - Pattern

31 - Frame of the support

32 - Reader

33 - External tube

34 - Needle roller bearing

35 - Thrust needle roller bearing

81 - Longitudinal element

82 - Stopper

90 - Upper arm

91 - Lower arm

92 - Apertures

100 - Peristaltic pump head

110 - Centrifugation device

111 - Base surface

112 - Aperture of the base surface

113 - Outer shell

114 - Driven shaft of the centrifugation device

115 - Inner bowl

116 - Drive disc

117 - Handle

170 - bloating head configured to engage/disengage with the peristaltic pump head

171 - Lirst drive shaft of the floating head

172 - Second drive shaft of the floating head