Such devices can be designed as a glucose meter for the self-diagnosis of diabetics. A plurality of test fields is provided on a spoolable test tape in the tape cassette. The reactive test fields are examined photometrically after the application of a small amount of blood sample in order to determine the glucose content. The tape cassette is inserted as a disposable part into a compact hand-held device housing in order to allow the necessary analytical steps to be carried out automatically and rapidly.

The document WO 2012/080384 discloses a glucose meter having a door lock for retaining the cassette door in the closed position, wherein the protective cover is coupled with the door lock via an interlocking mechanism, whereby the door lock is blocked in the closed position of the protective cover and can be unlocked in the release position of the cover. The interlocking mechanism has a swivel-mounted lock catch which can be turned by manually operating the protective cover. Further, the door lock has a slider for manual operation. However, such function is not intuitively clear to the user, is difficult in handling and requires a complex construction. If the slider is operated in the closed or not fully opened position of the tip cover, the cassette door will not open and the user may get the false impression that the cassette door is jammed. On this basis the object of the invention is to further improve the known test devices and methods of device operation to achieve a user-friendly, simple and straightforward producible design. The combination of features stated in the independent claims is proposed to achieve this object. Advantageous embodiments and further developments of the invention are derived from the dependent claims.

The invention is based on the idea of using only one operating element for enabling a cassette change. Accordingly it is proposed according to the invention

a housing having a cassette compartment adapted to receive a replaceable analytical tape cassette,

a cassette door which can be retained in a closed position preferably by a door lock and which allows access to the cassette compartment through a housing opening in an open position,

a tip cover which can be positioned in a first (closed) position covering a housing aperture and a second (operating) position allowing access to a tip of the tape cassette arranged to protrude through the housing aperture for sample application,

wherein the tip cover is moveable into a third (release) position in which the cassette tip is at least partially uncovered and the housing opening is extended into the area of the cassette tip,

and wherein the cassette door is self-opening when moving the tip cover to the third position.

In this way the tape cassette can be easily removed without collision with the tip cover. As the cassette door is self-opening in the third position, it is required to handle only one functional element to move the tip cover into the third position. There is no need for the user to know the function of additional elements and the order of their use.

In a preferred embodiment the door lock is automatically unlocked when moving the tip cover to the third position, so that a self-acting opening of the cassette door is effectuated. Another advantageous embodiment provides that the door lock can be unlocked by means of a manually activated release button, wherein the release button is mechanically connected to the tip cover to actuate a movement to the third position. In this way, the release button is the only operational element to be handled in case of a cassette exchange.

In order to further ease the operation, it is advantageous when a sliding module is connected to the release button, wherein the tip cover can be pivoted from the first position to the third position by a pull force of the sliding module.

It is also conceivable that the tip cover can be manually operated to assume the third position and at the same time forms a leverage to actuate the door lock. A further improvement can be achieved when a pivot is provided to allow pivoting of a free end of the tip cover.

In a further preferred embodiment the tip cover is movable in a guide structure between the first and second position, wherein the guide structure is mounted on a slider which is movable relative to the housing, wherein a movement of the slider carries the tip cover to the third position and unlocks the door lock.

For an ergonomic design, it is particularly advantageous when a grip member formed on the slider for shifting of the slider in linear track of the housing.

A further manufacturing and functional simplification can be achieved when the tip cover is moveably connected to the cassette door to allow movement between the first and second position, and when the cassette door and the tip cover can be moved cooperatively as a unitary lid to move the cassette door to the open position and the tip cover to the third position. In this context, it is further advantageous when a folding connection is provided as a hinge mounted between an edge of the cassette door and of the tip cover. Another unique aspect of the invention is test tape device comprising a housing having a cassette compartment adapted to receive a replaceable analytical tape cassette, a cassette door which can be retained in a closed position preferably by a door lock and which allows access to the cassette compartment through a housing opening in an open position, a tip cover which can be positioned in a first (closed) position covering a housing aperture and a second (working) position allowing access to a tip of the tape cassette arranged to protrude through the housing aperture for sample application, and further comprising a device electronics that is configured to prompt the user to open the tip cover for a cassette change and automatically unlocks the cassette door in the open position of the tip cover. In this way, there is no need for a specific user operation for opening the cassette door, and any confusion on the sequence of operation during the cassette change is avoided. Furthermore, a compact and robust design with a reduced number of mechanical elements can be achieved.

Preferably, the device electronics is adapted to detect conditions for replacement of the tape cassette, wherein said conditions comprise one of a consumed number of tests, a defect of the cassette and expiry of a life period of the cassette.

The invention is also directed to a test tape system comprising a test tape device according to the invention and an analytical tape cassette including a test tape inserted in the cassette compartment.

In order to achieve the objects stated above with respect to a method of operation, the following measures are proposed

positioning a tip cover in a first position for covering a housing aperture, - moving the tip cover to a second position to allow access to a tip of the tape cassette for sample application, moving the tip cover to a third position in which the cassette tip is at least partially uncovered and the housing opening is extended into the area of the cassette tip,

inserting or replacing the tape cassette in the third position of the tip cover, wherein the cassette door is self-opening.

In a preferred embodiment, tip cover is provided as an actuation element for automatically releasing a door lock of the cassette door in the third position. The invention is further elucidated in the following on the basis of a embodiment examples shown schematically in the drawings, where

Fig. 1 shows a tape cassette-type glucose meter in the closed position of both a cassette door and a tip cover in a perspective view (Fig. 1 a) and sectional views (Figs. 1 b,c) along lines b - b and c - c of Fig.

1 c and b, respectively;

Fig. 2 shows the glucose meter in a working position of the tip cover in views similar to Fig. 1 ;

Fig. 3 shows the glucose meter in a release position of the tip cover for opening the cassette door in views similar to Fig. 1 ;

Fig. 4a is a rear view of a further embodiment of a tape cassette-type glucose meter illustrating three positions of the tip cover; is a partly expanded and cutaway side view showing a cassette door lock of the glucose meter of fig. 4a; Fig. 4c is a perspective view of a mechanism of the glucose meter of Fig.

4a connecting a release button to a door lock; Fig. 5 shows perspective views of a further embodiment of a glucose meter with a sliding release mechanism;

Fig. 6 shows perspective views of a still further embodiment of a glucose meter with a combination door and tip cover;

Fig. 7 shows an alternative embodiment of a glucose meter with an electronically controlled cassette door. The drawings illustrate a test tape device configured as a portable glucose meter 10 for self-monitoring of blood glucose and comprising a housing 12 for inserting a disposable analytical tape cassette 14. The tape cassette 14 stores a number of test fields on a carrier tape which can be successively spooled forwards to a cassette tip 16 for a targeted application of a blood sample.

As shown in Figs. 1 a-c the glucose meter 10 comprises a hinged cassette door 20 covering a cassette compartment 22 and a tip cover 24 protecting a lateral housing aperture 26 and the cassette tip 16 protruding therethrough. The tip cover 24 forms a shell over the cassette tip 16 and has an extension 28 which is guided in an arc-shaped conduct 30. This conduct 30 is formed in a guide block 32 slidably disposed in the housing 12.

The cassette door 20 on one side has a spring-loaded hinge 34 configured to swing open automatically when released to allow a change of cassette 14. In the state shown in Fig. 1 , when the tip cover 24 is in the closed (first) position, the cassette door 20 is locked by retaining hooks 36 engaging into undercut recesses 38 of the guide block 32. Thus, the cassette 14 cannot be removed when the side wall 40 of the tip cover 24 in the closed position overlaps the cassette tip 16. In this way, accidental damage by the user is avoided. Figs. 2a-c show the glucose meter 10 with the tip cover 24 in a second (operating) position. To attain this position, the extension 28 is moved on a curved path in the conduct 30 by appropriate manual actuation of the tip cover 24. In the second position of the tip cover 24, the carrier tape 42 guided above the cassette tip 16 is easily accessible for sample application, e.g. a blood drop from a fingertip. Still, the cassette door 20 is maintained in the closed position by retaining hooks 28.

As illustrated in Figs. 3a-c, the cassette 14 can be easily exchanged in a third (release) position of the tip cover 24. This position can be reached by manually gripping the tip cover 24 and exerting a pulling force, whereby the extension 28 extracts the guide block 32 out of the housing 12 along a limited distance defined by the recesses 38. In the open-end position, the retaining hooks 36 disengage the undercut and the cassette door 20 swings open under spring force. Then, the opening 21 of the cassette compartment 22 is extended into the area of the cassette tip 16 and the tape cassette 14 can be removed or exchanged without collision with the tip cover 24. Hence the tip cover 24 can be used as an operating element for both actuations, namely exposure of the sample application site and simultaneous opening of the cassette door 20 and tip cover 24.

Fig. 4 shows an embodiment which allows to accomplish simultaneous opening of the cassette door 20 and removal of the tip cover 24 for cassette exchange by means of a single one release button 44. The release button 44 can be manually operated as a sliding switch with the thumb of the hand holding the meter

As illustrated in Fig. 4a the tip cover 24 can be moved into three positions. The arcuate movement between the closed position (solid line) and open position (dotted line) can be effected with the aid of a finger grasp 46 formed on the outer contour of the tip cover 24. The release position (dot and dash line) can be triggered via the release button 44, as further explained below. Fig. 4b shows a lock module 48 for the cassette door 20. This module comprises two swing pinions 50, 52 which are swivel-mounted on respective bearing pins 54 such that locking hooks 56 can engage a holding part 58 on the inner side of the cassette door 20. Swing pinion 50 has a driving pin 60 connected to the release button 44. Swing pinion 52 has a linking pin 62 for actuating movement of the tip cover 24 into the third (release) position. When pushing the release button 44 (rightward as shown in Fig. 4b), the driving pin 60 on pinion 50 will rotate clockwise, effecting a counterclockwise rotation of pinion 52 through tooth engagement. Then, the cassette door 20 will be released and swing open under spring force. Manual closing of the cassette door 20 will exert a force on the pinions 50, 52 to rotate in the locking direction. Fig. 4c further elucidates a sliding module 64 next in line to the lock module 48 construed for movement of the tip cover 24 into the third (release) position. The sliding module 64 has a guide member 66 to transform the rotary motion of the linking pin 62 into a linear movement of a pulling member 68 acting on shaft 70. As the extension 28 of tip cover 24 has a pivot 72, the exerted pulling force promotes the tip cover 24 to swivel out to the position shown in dot and dash line in Fig. 4a. Thus, the tip cover 24 opens at the same time as the cassette door 20, and the cassette 14 is accessible to be replaced conveniently without collision. Fig. 5 illustrates a design in which the tip cover 24 is movable on a guide structure 74, which in turn is mounted on a slider 76 that can be displaced relative to the housing 12 by means of a manually operated grip member 78.

Fig. 5a shows the tip cover 24 in the closed state (first position), where the cassette door 20 is also closed and the meter 10 is in sleeping mode. For normal operation, the tip cover 24 can be moved by aid of finger grasp 46 along guide structure 46 to assume the open state (second position), as shown in Fig. 5b. In this working mode of the meter 10, the cassette tip 16 is accessible for sample application and optical measurement. As can be seen from Fig. 5c, the tip cover 24 can be transported to a third position where the cassette tip 16 is laterally exposed. The manually operated grip member 78 allows a corresponding linear shifting of the slider 76 in a track 80 of the housing 12. As explained before, the movement of the slider 76 also releases a door lock, e.g. retaining hooks 36, such that the cassette door 20 automatically opens and the cassette 14 can be replaced (Fig. 5d). In order to assist the user in accurate positioning, the intended end positions can be marked by position marks 81 or pictograms provided on the housing and on the tip cover 24 and/or the slider 76. Then, the user is aware of the range of movement and the second and third positions can be located precisely specifically if the movement requires several steps in one direction.

Fig. 6 shows an embodiment in which the tip cover 24 is connected to a lateral edge of the cassette door 20 via a hinge 82 to allow movement between the first and second position (Fig. 6a), and in which the cassette door 20 and the tip cover 24 can be moved cooperatively as a unitary lid 84 to move the cassette door 20 to the open position and the tip cover 24 to the third position (Fig. 6b).

Fig. 6 illustrates another embodiment of a glucose meter 10 having a tip cover that can be manually displaced on a guide structure 74 between first and second positions as also shown in Fig. 5a and b. The meter 10 further comprises a device electronics 86 that is configured to prompt the user to open the tip cover 24 for a cassette change. For this purpose, device electronics 86 is adapted to detect conditions for replacement of the tape cassette, e.g. a consumed number of tests, a defect of the cassette 14, expiry of a life period of the cassette 14. Such a prompt can be shown on display 88, and then the device electronics 86 automatically unlocks the cassette door in the open position of the tip cover 24.