FIELD OF THE INVENTION

The present invention relates to a reservoir for storing a liquid medicament. The present invention relates further to a method of producing a reservoir for storing a liquid medicament. The present invention further relates to a method for filling a reservoir for storing a liquid medicament. The present invention further relates to a method for delivering an amount of a liquid medicament from a reservoir having stored the liquid medicament. The invention further relates to a medical pump for the automated administration of a liquid medicament.

BACKGROUND ART

In connection with the administration of liquid medicaments, for example in pain therapies, in treatment of diabetes, etc., infusion pump devices, such as insulin pumps, are used. The pump devices have arranged containers for storing the liquid medicament. These devices can be carried by a patient on the body. The containers can have a disposable design for reasons of sterility, contamination-prevention, etc. The containers can have a reusable design enabling to be filled and re-filled by a user, for example in case of medicaments that are not available in pre-f illed containers, wherein a larger choice of sources of medicaments is provided, in case of medicaments having limited stability when stored in plastic contain- ers, etc. The containers can have a rigid or a flexible design. Rigid containers can comprise a cylinder having arranged a plunger that is controlled by a motor for dosing the liquid medicament. The precision of such systems is relatively low and prone to malfunction because of air bubbles, change of position, etc. In case of flexible containers, the liquid medicament is administered using a small pump. Flexible containers have the advantage of a smaller volume surplus, reduced manufacturing costs, etc.

EP2229927 discloses a flexible container for storing a liquid medicament. The container comprises two wall sheets of a flexible material that are sealed together. The container comprises a storage compartment for the liquid medicament and an access opening on one of the wall sheets. The container comprises an insert part that is arranged between the two wall sheets with positive locking and that fluidly connects the storage compartment and the access opening. The wall sheets are sealingly connected along a peripheral sealing rim. Instead of two wall sheets, one single folded sheet can be used. The container may include a connection device for use in an infusion pump device. The connection device may comprise a degassing membrane.

EP2455 1 26 discloses a container for storing a medical or pharmaceutical liquid. The container comprises a storage compartment for storing the liquid. The storage compartment comprises an inlet opening for filling the storage compartment and an outlet opening for discharging liquid out of the storage compartment. A hydrophilic membrane is arranged within the storage compartment, which is gas-tight in a wet condition and which at least covers the outlet opening and which contacts the liquid stored in the storage compartment. The container comprises two wall parts, wherein a first wall part is realized by a rigid wall part and a second wall part is realized by a flexible wall sheet. The two wall parts are joined together for establishing a gas- and liquid tight bonding . US201 001 30957 describes a collapsible fluid reservoir that may be expanded during use and collapsed to lie substantially flat when not in use. The fluid reservoir can be used during certain surgical procedures, such as cardiologic procedures, to temporarily hold biological fluids such as blood. The collapsible fluid reservoir can include a non-rigid container having an open proximal end and a sealed distal end opposite the proximal end defining a cavity therein, wherein the distal end includes a fluid outlet port. The collapsible fluid reservoir can include a rigid cap affixed to the proximal end and including a fluid inlet port. The cross- sectional shape of the proximal end can be circular, ovular, or polygonal.

DISCLOSURE OF THE INVENTION It is an object of the present invention to provide a reservoir and a method of producing a reservoir, which do not have at least some of the disadvantages of the prior art. In particular, it is an object of the present invention to provide a reservoir and a method of producing a reservoir, wherein the reservoir makes efficient use of available space. In particular, it is an object of the present invention to provide a reservoir and a method of producing a reservoir, wherein the reservoir is robust. In particular, it is an object of the present invention to provide a reservoir and a method of producing a reservoir, wherein the reservoir is inexpensive.

According to the present invention, these objects are achieved through the features of the independent claims. In addition, further advantageous embodiments follow from the dependent claims and the description. According to the present invention, the above-mentioned objects are particularly achieved by a reservoir for storing a liquid medicament, which reservoir comprises: a flexible container which includes one folding layer, wherein the folding layer includes a seam which provides for a sealing of the flexible container. The reservoir comprises a rigid part which is connected to the flexible container and which includes a support extending into the flexible container and which includes one or more ports providing fluidic access to the flexible container. The reservoir comprises a porous hydrophilic membrane which is connected to the support of the rigid part. The rigid part provides a robust design and for example enables installation in and connection with a liquid pump, while the flexible container enables that available space is efficiently used. The porous hydrophilic membrane provides a robust design and prevents that air bubbles are administered together or instead of the liquid medicament. Production of the reservoir requires few parts and can be inexpensive. In an em- bodiment, the liquid medicament includes insulin. In a dry state, the porous hydrophilic membrane is permeable to air, such that air can pass the porous hydrophilic membrane when the flexible container contains air. The air can be sucked out of the flexible container before filling the flexible container with the liquid medicament. In a wet state, as soon as the porous hydrophilic membrane is in contact with the liquid medicament, the porous hy- drophilic membrane is air-impermeable, thereby preventing that air bubbles are administered together or instead of the liquid medicament.

In an embodiment, the flexible container includes a cross section with a rectangular design. A rectangular design makes efficient use of available space.

In an embodiment, the flexible container includes a section of a foil tube. A section of a foil tube is available at low costs. The size of the flexible container, namely the available volume for storing the liquid medicament, can be adapted to requirements by selecting a section of the foil tube having a predefined length. In an embodiment, the folding layer provides that walls of the flexible container exhibit a curved surface. The curved surface may provide for a robust design. The curved surface may simplify unfolding or folding of the flexible container when filling the reservoir with a liquid medicament or when delivering an amount of the liquid medicament from the res- ervoir. The curved surface may vary considerably as relates shape, dimensions, etc. For example, the curved surface may have the shape of a conoid, a paraboloid, etc.

The seam, which is included in the folding layer, provides an inexpensive sealing of the flexible container.

In an embodiment, the folding layer and the rigid part are arranged on opposite sides of the flexible container. The reservoir has a robust design while the rigid part provides for robust installation and connection with a medical pump and the other side of the reservoir provides for robust unfolding and folding of the flexible container.

In an embodiment, the flexible container is bonded to the rigid part. Bonding may include heat sealing, ultrasonic welding, high-frequency inductive welding, gluing, etc. The reser- voir has a robust design and the flexible container is firmly connected to the rigid part.

Because the rigid part includes a support extending into the flexible container and supporting the porous hydrophilic membrane, the reservoir has a robust design and the porous hydrophilic membrane is firmly arranged in the reservoir.

Because the rigid part includes one or more ports providing fluidic access to the flexible container, the reservoir has a robust design and provides for fluidic connection with a medical device such as a medical pump. In an embodiment the rigid part includes one or more mounting parts for mounting the reservoir to a medical device. In some embodiments, the one or more mounting parts includes one or more pins. The reservoir has a robust design and provides for firm mounting to a medical device such as a medical pump. In an embodiment, the rigid part includes one or more pins for mounting the reservoir to a medical device. The reservoir has a robust design and provides for firm mounting to a medical device such as a medical pump.

The invention further relates to a method for producing of a reservoir as described in the present specification. The method comprises: providing a flexible tube and a movable opening device located inside the flexible tube, moving the moveable opening device inside the flexible tube by a distance in a longitudinal direction of the flexible tube, providing a rigid part, and bonding the flexible tube to the rigid part and providing a folding layer included in the flexible container. The flexible tube can be provided in a large quantity enabling inexpensive production of the reservoir. The flexible tube can be provided in the form of a roll. The method enables production of inexpensive reservoirs having a robust design. By varying the distance the moveable opening device is moved inside the flexible tube, the volume of the flexible container of the reservoir can be varied and easily adapted to predefined requirements.

In an embodiment, the foil tube and the rigid part are provided having a rectangular cross section enabling bonding of the flexible tube to the rigid part in a kitty corner manner. Accordingly, the flexible container of the reservoir has a cubic design thereby making efficient use of available space, wherein the bonding in a kitty corner manner provides for a robust design. In accordance to Merriam-Webster, the term "kitty corner" defines that the arrangement is in a diagonal or oblique position, such as in the example of a house standing kitty-corner across a square, "kitty-corner" means "diagonally opposite" and applies to the way how the rigid part and the foil tube fit together especially at the corners of their rectangular shapes.

The invention further relates to a method for filling a reservoir as described in the present specification. The method comprises: actuating a fill device connected to the reservoir for filling the reservoir via the one or more ports at least partly with the liquid medicament thereby unfolding the flexible container. For example, the fill device can pump the liquid medicament into the reservoir. The flexible container unfolds in accordance to the amount of the filled liquid medicament. In a variant, the method comprises: actuating a fill device connected to the reservoir thereby unfolding the flexible container and having stored the liquid medicament for filling the reservoir at least partly with the liquid medicament.

The invention further relates to a method for delivering a liquid medicament from a reservoir as described in the present specification. The method comprises: actuating a delivery device connected to the reservoir for at least a partial delivery via the one or more ports of the liquid medicament stored in the reservoir thereby folding the flexible container. The liquid medicament is delivered via the one or more ports to a further medical device, such as for example, a medical pump. For example, the delivery device can suck the liquid medicament from the reservoir. The flexible container folds in accordance to the amount of the delivered liquid medicament. In a variant the method comprises: actuating a delivery device connected to the reservoir for at least a partial delivery of the liquid medicament stored in the reservoir thereby folding the flexible container The invention further relates to a medical pump for the automated administration of a liquid medicament, wherein the medical pump comprises a reservoir as described in the present specification .

BRIEF DESCRIPTION OF THE DRAWINGS

The herein described invention will be more fully understood from the detailed description given herein below and the accompanying drawings which should not be considered limiting to the invention described in the appended claims. The drawings are illustrating schematically:

Fig. 1 a reservoir for storing a liquid medicament;

Fig. 2 a rendered view of the reservoir for storing a liquid medicament;

Fig. 3 a different rendered view of the reservoir for storing a liquid medicament;

Fig. 4 a spatial view of the rigid part for a reservoir; and

Fig. 5 a method for producing a reservoir.

MODE(S) FOR CARRYING OUT THE INVENTION

Figure 1 illustrates schematically a reservoir 1 for storing a liquid medicament, for example for storing a liquid medicament such as insulin. Figure 2 illustrates a rendered view of the reservoir 1 for storing a liquid medicament. Figure 1 and Figure 2 correspond to each other. In order to improve clarity of the illustrations, some reference signs are included only in Figure 1 or only in Figure 2.

The reservoir 1 comprises a flexible container 1 0. The flexible container 1 0 may include a foil, such as a plastic foil. The flexible container 1 0 has essentially the form of a rectangular 5 cuboid having a top wall 1 0t, a bottom wall 1 Ob, a left wall 1 0I and a right wall 1 0r, as indicated with arrows in Figure 1 . The denomination of the top wall 1 0t, the bottom wall 1 0b, the left wall 1 0I and the right wall 1 0r is in accordance to their positions illustrated in Figure 1 and in Figure 2.

The flexible container 1 0 is connected to a rigid part 20. The rigid part 20 has essentially Ί o the form of a rectangular cuboid. The form of the rigid part 20 is adapted to the form of the flexible container 1 0. For example, a foil included in the flexible container 1 0 may be bonded to the rigid part 20 in a kitty corner manner.

The flexible container 1 0 includes a folding layer 1 2. The folding layer 1 2 and the rigid part 20 are arranged on opposite sides of the flexible container 1 0.

1 5 Following the flexible container 1 0 in direction to the folding layer 1 2, the top wall 1 0t, the bottom wall 1 0b, the left wall 1 0I and the right wall 1 Or continue into the folding layer 1 2. The folding layer 1 2 includes a seam 1 3 which provides for a sealing of the flexible container 1 0. As illustrated in Figure 2 and Figure 3 (which will be described in more detail below), the seam 1 3 extends in a horizontal direction essentially from a plane defined by 0 the left wall 1 0I to a plane defined by the right wall 1 0r. The seam 1 3 is arranged with respect to a plane defined by the bottom wall 1 0b on about a height which is the middle between the top wall 1 Ot and the bottom wall 1 0b. A middle section 1 3m of the seam 1 3 connects together parts of the top wall 1 0t and the bottom wall 1 0b. A left section 1 3I of the seam 1 3 connects together parts of the left wall 1 0l, the top wall 1 0t and the bottom wall 1 0b. A right section 1 3r of the seam 1 3 connects together parts of the right wall 1 Or, the top wall 1 Ot and the bottom wall 1 0b.

As illustrated in Figure 1 and Figure 2, the folding layer 1 2 has the shape of a gable roof that is turned by 90 degrees, wherein the left gable, which faces a plane defined by the left wall 1 0I, and the right gable, which faces a plane defined by the right wall 1 0r, exhibit a curved surface 1 1 . The shape of the curved surface 1 1 depends on geometries, material properties, fill level, etc. of the flexible container 1 0. Figure 1 and Figure 2 illustrate that the curved surface 1 1 is included in the folding layer 1 2, wherein the other parts of the flexible container 1 0 do not include the curved surface 1 1 . However, depending on the geometries, material properties, fill level, etc., the curved surface 1 1 may extend from the seam 1 3 to the rigid part 20.

As illustrated in Figure 1 and Figure 2, the rigid part 20 includes one or more ports 21 , 22. The ports 21 , 22 provide fluidic access to the flexible container 1 0. The port with reference sign 21 may be designed for delivering an amount of the liquid medicament from the reservoir 1 . The port with reference sign 22 may be designed for filling the reservoir 1 with the liquid medicament. The port with reference sign 22 designed for filling the reservoir 1 may include a flange for attaching a filling device. The port with reference sign 22 designed for filling the reservoir 1 may include a septum. As illustrated in Figure 1 and Figure 2, the rigid part 20 includes one or more pins 23, 24. The pins 23, 24 provide for mounting the reservoir 1 to a medical device such as a medical pump. Unfolding of the flexible container 1 0 occurs while filling the reservoir 1 with a liquid medicament. Folding of the flexible container 1 0 occurs while delivering an amount of the liquid medicament from the reservoir 1 .

As illustrated in Figure 1 and Figure 2, the rigid part includes a support 25 which extends 5 into the flexible container 1 0 and which supports a porous hydrophilic membrane 26. The porous hydrophilic membrane 26 avoids the entry of air during folding and unfolding once it is wetted by the liquid medicament.

The flexible container 1 0 provides for efficient use of available space. Unfolding the flexible container 1 0 prevents the liquid medicament from swashing and deterioration.

Ί o The rigid part 20 provides for a stable mounting of the reservoir 1 to a medical device such as a medical pump. The rigid part 20 provides for fluidic access to the flexible container 1 0, which enables filling of the flexible container 1 0 with a liquid medicament and delivery of the liquid medicament from the flexible container 1 0. Folding and unfolding of the flexible container 1 0 occurs with respect to the stable rigid part 20. The rigid part 20 provides for

1 5 a stable mounting of the porous hydrophilic membrane 26.

Figure 3 illustrates a different rendered view of the reservoir 1 for storing a liquid medicament. With respect to Figure 1 and Figure 2, the reservoir 1 is rotated about 1 80 degrees about a vertical axis.

As illustrated in Figure 3, the reservoir 1 includes a flexible container 1 0 and a rigid part 20. 0 The flexible container 1 0 includes a folding layer 1 2. The rigid part 20 includes a support 25 extending into the flexible container 1 0 and supporting an porous hydrophilic membrane 26. The flexible container 1 0 includes a top wall 1 Ot, a bottom wall 1 0b, a left wall 1 0I and a right wall 1 Or. The left wall 1 0l and the right wall 1 Or are denominated and illustrated with reference signs in accordance to Figure 1 and Figure 2.

The folding layer 1 2 includes a seam 1 3, which includes a middle section 1 3m, a left section 1 3I, and a right section 1 3r. The left section 1 3I and the right section 1 3r of the seam 1 3 are denominated and illustrated with reference signs in accordance to Figure 1 and Figure 2. The middle section 1 3m of the seam 1 3 connects together parts of the top wall 1 Ot and the bottom wall 1 0b. The left section 1 3I of the seam 1 3 connects together parts of the left wall 1 0l, the top wall 1 0t and the bottom wall 1 0b. The right section 1 3r of the seam 1 3 connects together parts of the right wall 1 0r, the top wall 1 0t and the bottom wall 1 Ob. On a side facing a plane defined by the right wall 1 0r, the folding layer 1 2 exhibits a curved surface 1 1 . On a side facing a plane defined by the left wall 1 Ol, the folding layer 1 2 exhibits also curved surface (not illustrated with a reference sign). Depending on the geometries, material properties, fill level, etc., the curved surface 1 1 may extend from the seam 1 3 to the rigid part 20. Figure 4 illustrates a spatial view of the rigid part 20 for a reservoir 1 . The rigid part 20 includes a support 25. The support 25 is connected to the rigid part 20. The rigid part 20 and the support 25 may be fabricated in the form of a single work piece. The support 25 supports the porous hydrophilic membrane 26. As indicated with reference signs, the rigid part 20 includes ports 21 , 22 for enabling a fluidic access to the flexible container of the reservoir (not clearly visible in Figure 4). As indicated with reference signs, the rigid part 20 includes pins 23, 24 for mounting the flexible reservoir to a medical device (not clearly visible in Figure 4). As illustrated in Figure 4, a fluidic connection 27 is arranged between the porous hydrophilic membrane 26 and a the port for delivery of the liquid medicament from the reservoir (not illustrated in Figure 4). Figure 5 illustrates schematically a method for producing a reservoir 1 .

The method for producing a reservoir 1 comprises providing a flexible tube 30 and a movable opening device 40 located inside the flexible tube 30. In some embodiments, the opening device 40 has the design of a cotter, a wedge, or a similar design. The opening device 40 provides that the flexible tube 30 can be brought from a folded state into an opened state, such that the rigid part 20 can be mounted into the flexible tube 30. The flexible tube 30 may be provided in the form of a roll, wherein an end of the flexible tube 30 is unrolled and wherein the moveable opening device 40 has been inserted through the end of the flexible tube 30 and is located inside the flexible tube 30. Along the movable opening device 40, towards the foil roll, the cross section of the flexible tube 30 has a flat shape and towards the end of the flexible tube 30 the cross section has a rectangular shape.

The method for producing a reservoir 1 comprises moving S 1 the moveable opening device 40 inside the flexible tube 30. As illustrated in Figure 5 , the moveable opening device 40 is moved towards the foil roll. The moveable opening device 40 is moved a distance that enables production of the flexible container 1 0 in the following step. Between the moveable opening device 40 and the end of the flexible tube 30, the flexible tube 30 has the form of a cuboid.

The method for producing a reservoir 1 comprises providing a rigid part 20. The rigid part 20 may include a support 25 for supporting an porous hydrophilic membrane 26, as illus- trated in Figure 4. The support 25 an the porous hydrophilic membrane 26 may be inserted into the part of the flexible cube 30 that has the form of a cuboid, as described above.

The method for producing a reservoir 1 comprises bonding S2 the flexible tube 30 to the rigid part and providing a folding layer 1 2 included in the flexible container 1 0. A welding method may be applied that tightly bonds the foil to the rigid part 20 kitty-corner. A welding method may be applied that provides a seam 1 3 of the folding layer 1 2 included in the flexible container 1 0. The foil tube may be cut in order to provide a reservoir 1 as illustrated in Figures 1 -3.

1 fluid reservoir

1 0 flexible container

1 ot top wall of the flexible container

1 0b bottom wall of the flexible container

1 01 left wall of the flexible container

1 Or right wall of the flexible container

1 1 curved surface

1 2 folding layer

1 3 seam

1 31 left section of the seam

1 3m middle section of the seam

1 3r right section of the seam

20 rigid part

21 , 22 ports

23, 24 pins

25 support

26 porous hydrophilic membrane

27 fluidic connection

30 flexible tube

40 movable opening device