WO1996035472A1

WO1996035472A1 - Portable medical pump device

Info

Publication number: WO1996035472A1
Application number: PCT/FR1996/000692
Authority: WO
Inventors: Christophe Aubert; Pierre Merz; Frédéric Neftel
Original assignee: Debiotech S.A.
Priority date: 1995-05-09
Filing date: 1996-05-09
Publication date: 1996-11-14
Also published as: AU5825396A; FR2733915A1

Abstract

A medical micropump device having a pump for injecting a liquid material which includes a housing (12) with a first rotational side wall (18), a flexible tubing (16) which has a first end connected to the pump and a second free end, and a hollow rotational pump support (14) containing the pump housing (12). The pump support (14) allows access to at least the major portion of one of the side surfaces of the pump housing (12) and surrounds at least partially the rotational side wall of the housing (12) to form a winding space (26) for receiving the tubing reel (16). The pump support (14) has at least one opening on its peripheral surface through which extends the free end of the tubing (16), means for rotationally guiding the pump housing and coupling means for preventing the free separation of the pump support and the pump housing. The device provides a portable winding apparatus with the possibility of adjusting the length of the tubing connecting the micropump to the injection site.

Description

MEDICAL PORTABLE PUMP DEVICE

The present invention relates to a micropump device intended in particular for an electromechanical medical micropump with a disposable electromagnetic motor, of small size and of circular shape.

Such a micropump is known and described in particular in patent applications EP 388 787, EP 447 909 and FR 2 677 711. These documents describe the structure and the internal mechanism of a portable peristaltic pump for administering a liquid therapeutic substance fitted with an integrated tank and an engine module. A pump like this prevents patients, having to receive medication, from lying on a bed. Indeed, thanks to its small size this pump can be worn on the human body.

Tubing secured to the pump connects the reservoir to the catheter located at the infusion site. Depending on the patient, this infusion site may vary, as can the location of the pump. Indeed, for various reasons of comfort, aesthetics or minimum bulk, the patient may wish to wear the pump in various places such as belt, abdomen or as a pendant.

The tubing must therefore be able to be long enough to be suitable whatever the infusion site and the place where the pump is located: on the bedside table, hung on the shower tap, carried by the user, etc ... The infusion site may be relatively far from the pump when, for example, the pump is at the waist and the catheter on the wrist (intravenous administration), or very close to the pump when, for example, the pump is size and catheter in the abdomen for subcutaneous administration. Long tubing satisfies this condition satisfactorily.

However, this length is cumbersome in certain cases and it would be advantageous to be able to have a desired length adapted to the distance separating the site of infusion and the place of port of the pump. On the other hand, part of the pump can be reusable when it is designed with a motor module separable from the sterile reservoir and the useful length of the tubing must be adjustable according to the new user and / or new infusion site. The present invention therefore aims to fulfill all of the above objectives.

To this end, the present invention relates to a micropump device which makes it possible to wind and unwind the tubing either clockwise or in counterclockwise, until the length of the remaining tubing matches as needed.

The present invention also aims to facilitate the wearing of the pump according to the type of patient, the time of day and the activity exercised by the patient during the treatment (wearing the pump, shower, sleep, etc.).

If the pump is for single use, the support must be reusable and suit the type of port desired by the patient. This one can be a man, a woman, of strong build or rather thin. In addition, since the pump is worn continuously, it must be able to be easily worn in multiple ways so as to at least inconvenience the user during the day and at night, whatever the activity and position of the pump holder, even during a shower.

Thus, according to one embodiment of the invention, the support of the pump can be equipped with an element removably attached which will allow the micropump device to be hung on a belt. This element can be a clip formed by a plate which stands out, screwed onto the support or onto a removable accessory which relates to the support so that the micropump device becomes jammed on a belt thanks to the pressure exerted by this plate. on the rear side of the support.

In the case where the most discreet possible port is sought, the wearer of the pump can accommodate the elements of the micropump device in the pocket of an elastic belt worn directly on the skin.

It is also possible, according to the present invention, to wear the pump as a pendant. This can be particularly useful when taking a shower. For this, a removable cord can be connected to a loop located on the pump support. This passer-by can itself be removable.

According to another embodiment of the invention, the pump support is provided with a first coupling system element which will cooperate with a second coupling system element located on interchangeable port elements. The object of the invention is therefore to adapt a miniature medical pump in order to be able to adjust at will the useful length of the tubing which connects the pump to the infusion site while facilitating the wearing of this pump thanks to multiple means of carrying and fixing.

The object of the invention is a micropump device comprising: - a medical pump for injecting a liquid substance comprising a casing with an external side wall of revolution,

- a flexible tubing forming a first end connected to the pump and a second free end, - a hollow revolution pump support which contains the pump, leaves accessible at least the major part of one of the side faces of the pump, surrounds at least partially the lateral wall of revolution of the pump casing to form a space for winding the tubing, has at least one opening on the peripheral face of the pump support intended for the passage of the free end of the tubing, l 'winding space being of substantially constant width and greater than the diameter of the tubing, has means for guiding the pump in rotation and means for securing to prevent free separation between the pump support and the pump housing. The advantageous arrangements are, moreover, preferably adopted: - the micropump device further comprises means for guiding the tubing which are located in the casing of the pump, open onto the lateral wall of revolution of the casing of the pump and which, on the one hand, guide the tubing to the side of the winding space where the winding begins and, on the other hand, allow the tubing to exit tangentially to the pump housing, - the means of guide of the tubing consist of a winding guide in the form of a reamed or extruded sleeve whose inner profile guides the tubing for the formation of the first turn,

- the symmetry of the internal profile of the winding guide allows the tubing to exit tangentially to the pump casing to the right or to the left,

the micropump device further comprises carrying means,

- the carrying means consist of a loop located on the pump support which allows the port as a pendant thanks to a removable cord,

the carrying means form a clip by means of a spring plate, fixed to the rear face of the pump support to allow the micropump device to be hung on the belt,

the carrying means consist of a pocket located in an elastic belt, the carrying means consist of a first element of the coupling system located on an outer face of the pump support and of a second element of the coupling system located on a port element, the first element of the '' coupling reversibly cooperating with the second coupling system element,

- the coupling system is a bayonet system,

- the wearing element forms a loop for wearing as a pendant,

- the port element is fixed on a plate which comes out to form a hanging clip, - the port element consists of a reception element with hollow space in the shape of a disc and flange, this reception element being intended to cooperate by engagement with a disc-shaped element and a tissue, an area of said tissue being wedged between the disk-shaped element and the receiving element,

the pump support further comprises a notch making it possible to wedge the tubing,

- the pump housing and the pump support have their cylindrical revolution profile,

the securing means consist of the upper rim of the pump support, the means for guiding the pump in rotation have a symmetry of revolution which allows the pump to rotate clockwise or counterclockwise,

The main advantage of the invention lies precisely in the fact that, on the one hand, the pump housing also serves as a winding drum for the tubing and that, on the other hand, the support of the pump allows both wearing the pump and forming the winding space.

The invention will be better understood, and secondary characteristics and their advantages will become apparent during the description of embodiments given below by way of example. It is understood that the description and the drawings are given for information only and are not limiting.

Reference will be made to the accompanying drawings, in which:

- Figure 1 is a perspective view of the front face of the micropump device according to the invention; - Figure 2 is a partial cross section of the micropump device with winding of the tubing counterclockwise from the bottom of the winding space;

- Figure 3 is similar to Figure 2 but shows a winding of the tubing from the upper part of the winding space;

- Figures 4A to 4C are plan views of the winding guide;

- Figure 5 is identical to Figure 1 but only shows the pump support provided with certain means of carrying the micropump device according to the invention; and, - Figure 6 is a detailed perspective of a particular carrying means with removable loop.

- Figure 7 is a perspective view of the pump support according to another embodiment;

FIGS. 8A and 8B are perspective views of various port elements intended to couple with the pump support of FIG. 7.

As shown in FIG. 1, the micropump device 10 consists of a pump casing 12 contained in a pump support 14 and connected to a tube 16.

The pump housing 12 contains all the elements (not shown) of a medical micropump such as a peristaltic pump with motor element and reservoir for infusion liquid. This casing has a symmetry of revolution and preferably has a cylindrical side wall 18 whose width is less than the diameter of the cylinder 18. The two other lateral faces of the casing 12 are planar and the angles formed by the junction between these lateral faces and the face peripheral 18 are rounded. In the case of FIG. 1, this pump is of the type which has been described in FR 2 677 711; we can distinguish the tank module 20 from the engine module 22.

The interior of the pump support 14 must have approximately the same symmetry of revolution as the pump housing 12 so that these two elements can easily be rotated relative to each other. In the embodiment shown, the outside and the inside of the pump support 14 are cylindrical, which allows both the correct rotation of the pump casing 12 in the pump support 14 and a good grip of the device. micropump 10 when the outside of the pump support 14 is in the palm of the hand. The pump housing 12 is placed in the pump support 14 by the front face 24 of the pump support which only consists of a discontinuous peripheral flange 25 facing towards the inside of the pump support so as to retain the housing. pump side 12. The side wall of revolution of the pump support 14 is preferably non-continuous to allow a certain elasticity of this side wall leaves the possibility for the pump housing 12 to be inserted in the hollow of the support pump 14.

An important feature in the production of the micropump device according to the invention is that the peripheral space formed between the pump housing 12 and the pump support 14 creates a winding space 26 where the tubing 16 can be housed in the form of coils stacked in the winding path 26.

This tubing 16 will allow the pump to be connected to the catheter located on the infusion site. Tubing 16 is flexible, its first end is connected to the pump and its second end is either free or connected to the catheter during an infusion.

The way in which the tubing 16 is connected to the pump is not shown, but this connection must not interfere with the positioning of the pump casing 12 in the pump support 14 and the rotation or the rotational movement. of the pump housing 12 in the pump support 14.

Two openings 28 have been provided in the pump support 14 and one of them will serve as an outlet for the free end of the tube 16.

The symmetry of revolution of this embodiment allows winding of the tubing in the desired direction: winding on the right or winding on the left. The use of this micropump device is simple and easy: when all the elements of the micropump device have been mounted, the user will take the pump holder 12 in the hollow of one of his hands and with one or more fingers with the other hand, it will rotate the pump casing 12 in the pump support around the axis of rotation 30 in the direction which will allow it to obtain the length of tubing located outside the micropump device 10 which corresponds if needed.

Depending on the direction of rotation, the tubing will wind or unwind to form a stack of turns. It is intended that the width of the winding space 26 is not much greater than the diameter of the tubing 16 so that two turns cannot be one next to the other but that they are necessarily stacked.

To facilitate an orderly winding, provision is made to place a winding guide 32 in the pump housing, where the tubing exits the pump housing. This winding guide 32 is visible on the cross section of the micropump device (Figure 2).

The internal profile of this winding guide 32 makes it possible to guide the tubing at the pump outlet, on the one hand, towards the side of the winding space 26 where the winding will start and, on the other hand, tangentially to the pump housing. This guide prevents the tube from coming out of the pump housing at a right angle which could damage the tube and disturb or prevent the circulation of the liquid in the coiled tube during the infusion.

It should be noted that the micropump device, according to the invention, does not influence the operation of the pump and that it is even possible to adjust the length of the tubing during an infusion.

In Figure 2 the winding guide 32 is mounted so that the winding begins in the bottom of the winding space 26, that is to say on the side of the rear face 34 of the support pump.

In FIG. 3, the winding guide 32 is mounted differently and allows the winding to take place from the top of the winding space 26, that is to say on the side of the front face 24 of the pump support.

The winding guide is produced in the form of a sleeve whose external profile is adapted to the shape of the pump casing and whose internal profile guides the tubing so as to orient it to form the start of a turn. The main axis 36 of the inner profile of the winding guide is parallel and offset from the median plane of the micropump device on the side where the winding will start.

FIGS. 4A to 4C show the winding guide 32 not mounted in the pump housing. The front face 38 of the winding guide 32 has the same profile as the pump housing. Thus when the winding guide 32 is in place in the pump housing 12, the assembly formed by these two elements keeps a symmetry of revolution. The internal profile 40 of the winding guide 32 allows the passage of the tubing 16 from its place of attachment to the pump itself to the winding space 26. It is a conduit 40, preferably in the form of Y, the two branches of the Y of which open onto the front face 38 of the winding guide 32 and form a curvature, the profile of which deviates both from the main axis 36 of the conduit 40 and from the median plane defined by the axes 36 and 42. The median plane is the plane of symmetry of the internal profile 40 of the winding guide 32.

The tubing 16 is initially slid into the conduit 40 and oriented in that of the two branches of the Y which will allow the tubing to initiate the curvature of the first turn of the winding in the desired direction: clockwise or counterclockwise.

Thanks to the shape of the conduit 40 of the winding guide 32, the turns of the winding stack regularly, do not cross, and do not overlap. This regular stack facilitates the rotation of the pump casing 12 in the pump support 14 and, thus, a rapid modification of the free length of the tubing.

FIG. 5 illustrates the addition of carrying means on the pump support

14. A clip can be formed on the rear of the pump support: a rigid plate 42 which stands out is fixed by screws 44 on the rear flat side wall 34 of the pump support and makes it possible to hang the micropump device 10 on the patient's belt.

A loop 46 is preferably formed in an element 48 coming from the radial extension of the pump support 14. This loop allows, thanks to a removable cord, the pendant port of the micropump device 10, which may prove to be practical. when the patient wishes to take a shower.

The element 48 preferably has a notch 50 intended to wedge the tube 16 so that it ends up winding from bottom to top, so that there is no overlap between two sections of the tube and avoid that the tubing becomes tangled or knots. FIG. 6 proposes an alternative embodiment of the element for wearing as a pendant with a loop 46 separable from the element 48.

In addition, it is possible to wear the micropump device in the pocket of an elastic belt worn next to the skin, this means of wearing being more discreet. FIG. 7 represents the pump support 114 according to another embodiment which allows the addition of various port accessories with a single coupling system. This pump support 114 is identical to that which has been described above for all that relates to its peripheral side wall. Its rear face 34 is provided with a first coupling system element 52 located in the central part of the face 34.

The coupling system is preferably a bayonet system and in this case, the first coupling system element 52 comprises at least one arcuate groove 60 which opens radially into a central part which is circularly recessed from the face rear 34 of the pump support. The area between the recessed central part and the groove 60 is provided with a radial notch 64 on the side of the interior of the pump support. The groove 60, its opening 62 and the notch 64 are preferably found a second time on the rear face 34 of the pump support, symmetrically with respect to the axis of revolution 30 of the pump support 114.

FIGS. 8A and 8B illustrate two port accessories which can be coupled with the pump support 114 of FIG. 7.

These two figures represent identically the second element of the coupling system 54 consisting of a cylindrical projection 66 provided with at least one radial lug 68 facing outwards. The outside diameter of the projection 66 is at least slightly less than the diameter of the circularly recessed part of the face 34. The cylindrical projection 66 is preferably provided with a second lug 68 diametrically opposite to the first lug. These pins 68 protrude radially by a length less than the opening 62 of the rear face of the pump support. Thanks to this construction, the first and second coupling system elements 52, 54 will cooperate to couple the pump support 114 with the corresponding accessory. This coupling is carried out as follows: the second coupling system element 54 is centered at the rear of the rear face 34 of the pump support, the two lugs 68 of the second coupling system element are positioned in face of the two openings 62 of the first element of the coupling system then these lugs 68 are introduced into the openings 62 which makes the cylindrical projection 66 coincide with the interior of the hollowed out part of the rear face 34 of the pump support. A relative rotation of small amplitude between the pump support 114 and the accessory which carries the second coupling system element 54 allows the pins 68 to be positioned in the notches 64 hence a locking between the pump support 114 and its accessory. The accessory shown in FIG. 8A comprises two tapped holes 70 intended to receive two screws 44 entirely. As in the case of FIG. 5, these screws will be able to cooperate with a rigid plate 42 which stands out for the production of a clip for belt. The accessory of FIG. 8A also includes a separable element 48 with a loop 46 for wearing as a pendant. Another wearing accessory is shown in FIG. 8B: it consists of two elements 56 and 58 intended to cooperate by tight engagement on either side of a fabric used as a belt, for example. A receiving element 56 carries the second coupling system element 54 on a circular face which is extended on the other side by a discontinuous peripheral wall and a radial rim turned inwards. Each piece of this discontinuous peripheral wall is flexible and elastic enough to allow the engagement of a disc-shaped element 58 and its retention in the receiving element 56 thanks to the flange. This accessory works like a press button and allows you to position the micropump device on a fabric used as a belt or as an armband. It should be noted that the presence of the pump does not in any way modify the mounting of the port accessories on the pump support, said accessories being able to be dismantled by carrying out the mounting steps described above in the opposite direction.

It should moreover be understood that the foregoing description has been given only by way of example and that it in no way limits the field of the invention from which one would not depart by replacing the execution details described by all other equivalents.

Claims

CLAIMS 1. Portable micropump device (10) comprising:

- a medical pump for injecting a liquid substance comprising a casing (12) with a lateral wall of revolution (18), - a flexible tube (16) forming a first end connected to the pump and a second free end, characterized in that it further comprises

- a pump support (14) of hollow revolution containing said pump housing (12), leaving accessible at least the major part of one of the side faces of said pump housing (12), at least partially surrounding the side wall of revolution of said pump housing (12) to form a winding space (26) intended to receive the winding of said tubing (16), having at least one opening on the peripheral face of said pump support intended for the passage of the free end of said tubing, said winding space (26) being of substantially constant width and greater than the diameter of said tubing (16), said pump support (14) further having means for guiding said pump casing in rotation and securing means to prevent free separation between said pump support and said pump housing.

2. Micropump device according to claim 1, characterized in that it further comprises means for guiding said tube (16) located in the casing (12) of said pump, which open onto the lateral wall of revolution of the casing. (12) of said pump and which, on the one hand, guide said tube (16) towards the side of said winding space (26) where the winding begins and, on the other hand, allow said tube to exit tangentially said pump housing (12).

3. Micropump device according to claim 2, characterized in that the guide means of the tubing consist of a winding guide (32) in the form of a reamed or extruded sleeve whose internal profile (40) guides the tubing for the formation of the first turn.

4. Micropump device according to claim 3, characterized in that the symmetry of the inner profile (40) of the winding guide (32) allows the tubing to exit tangentially to the pump housing to the right or to the left.

5. Micropump device according to one of claims 1 to 4, characterized in that it further comprises carrying means.

6. Micropump device according to claim 5, characterized in that said carrying means consist of a pass (46) located on the pump support.

7. Micropump device according to claim 5, characterized in that said carrying means form a clip by means of a plate (42) which springs out, fixed on the rear face (34) of the pump support (14) to allow d '' hook the device (10) to the belt.

8. Micropump device according to claim 5, characterized in that said carrying means consist of a pocket located in an elastic belt.

9. Micropump device according to claim 5, characterized in that said carrying means consist of a first coupling system element (52) located on an outer face of the pump support (114) and a second a coupling system element (54) located on a port element, said first coupling system element cooperating reversibly with said second coupling system element.

10. Micropump device according to claim 9, characterized in that said coupling system is a bayonet system (52,54).

11. Micropump device according to one of claims 9 or 10, characterized in that said port element carries a passer-by (46).

12. Micropump device according to one of claims 9 or 10, characterized in that said port element is fixed on a plate (42) which comes out to form a hooking clip.

13. Micropump device according to one of claims 9 or 10, characterized in that said carrying element consists of a receiving element (56) with hollow space in the form of a disc and flange, this receiving element (56 ) being intended to cooperate by engagement with a disc-shaped element (58) and a tissue, an area of said tissue being wedged between the disk-shaped element (58) and the receiving element (56).

14. Micropump device according to any one of claims 1 to 13, characterized in that the pump support (14) further comprises a notch (50) for wedging the tubing.

15. Micropump device according to any one of claims 1 to 14, characterized in that the pump (12) and the pump support (14) have a cylindrical profile of revolution.

16. Micropump device according to any one of claims 1 to 15, characterized in that the securing means consist of the upper flange (25) of the pump support (14).

17. Micropump device according to any one of claims 1 to 16, characterized in that the means for guiding the rotation of the pump have a symmetry of revolution.