Device for metered administration of a liquid product

• US 20070010789A1
• Filed: 03/23/2006
• Published: 01/11/2007
• Est. Priority Date: 03/24/2005
• Status: Active Grant

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Roche Diagnostics International AG (Roche Holding AG)
• Inventors: Peter, Daniel, Gafner-Geiser, Simone
• Granted Patent: US 8,529,513 B2
• Time in Patent Office: Days
• US Class Current: 604/155
• CPC Class Codes: A61M 2005/14264 with means for compensating influence from the environment
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/14566 with a replaceable reservoir for receiving a piston rod of the pump
• CPC Class Codes: A61M 5/16831 Monitoring, detecting, signalling or eliminating infusion flow anomalies low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066

Abstract

A device for administering an injectable substance, the device including a housing, a translation member moveable in a translation direction, a rotation member rotatably moveable about a rotation axis and coupled to the translation member to support the translation member counter to the translation direction, a rotary bearing including a bearing body bearing the rotation member rotatably about the rotation axis, the rotary bearing having support surfaces for supporting the rotation member axially on the bearing body, and a device for reducing play whereby at least two support surfaces are brought into contact with a pressing force, thereby reducing an axial play of the rotary bearing.

Claims

1. A device for metered administration of an injectable product, said device comprising:

a) a housing comprising one of a product reservoir or a receiving seat for a product reservoir,

b) a translation member which, to deliver the product, executes a translation movement in a translation direction,

c) a rotation member which, for the delivery, executes a rotation movement about a rotation axis and is coupled to the translation member in such a way that it supports the translation member counter to the translation direction, and one of the movements of rotation movement and translation movement produces the other one,

d) a rotary bearing comprising a bearing body formed by or axially supported by the housing, which bearing body bears the rotation member rotatably about the rotation axis, and which rotary bearing has a first support surface, a second support surface, a third support surface and a fourth support surface in order to secure the rotation member axially on the bearing body,

e) the first support surface and the second support surface being connected axially rigidly to the bearing body and either facing away from one another axially or facing towards one another axially, and the third support surface facing axially towards the first support surface and the fourth support surface facing axially towards the second support surface and being axially rigidly connected to the rotation member, and

f) a device for reducing play with which at least two of the support surfaces facing axially towards one another are clamped axially to one another with a pressing force, thereby reducing an axial play of the rotary bearing.

2. The device according to claim 1, wherein the pressing force comprises an elasticity force.

3. The device according to claim 1, wherein the device for reducing play comprises a spring for generating the pressing force.

4. The device according to claim 3, wherein the spring acts like a leaf spring.

5. The device according to claim 3, wherein the spring is an axially elastic annular body that surrounds the rotation member.

6. The device according to claim 5, wherein the annular body is undulated about its perimeter.

7. The device according to claim 1, wherein the device for reducing play comprises a transmission body axially movable relative to at least one of the housing or bearing body and arranged between two of the axially facing support surfaces for transmitting the axial pressing force between these support surfaces.

8. The device according to claim 7, wherein the transmission body is guided axially by at least one of the bearing body or housing.

9. The device according to claim 7, wherein the transmission body is guided axially by at least one of the bearing body or housing and in a manner secure against twisting.

10. The device according to claim 7, wherein the support surfaces between which the transmission body is arranged are radially offset from one another, and the transmission body spans this radial offset.

11. The device according to claim 1, wherein one of the bearing body or the housing comprises a base part, preferably a sensor carrier, having an axially protruding pedestal which, at a front face, forms the second support surface.

12. The device according to claim 11, wherein the rotation member slides in rotation on the pedestal.

13. The device according to claim 12, wherein the rotation member comprises an annular web which forms at least one of the support surfaces of the rotation member.

14. The device according to claim 1, wherein the device for reducing play forms the first or second support surface and is in an adjustment engagement with the bearing body in which the first support surface and the second support surface are displaced relative to one another into an adjustment position and are axially secured relative to one another in the adjustment position such that an axial play of the rotary bearing is reduced.

15. The device according to claim 1, wherein the device for reducing play forms the third or fourth support surface and is in an adjustment engagement with the rotation member in which the third support surface and the fourth support surface are displaced relative to one another into an adjustment position and are axially secured relative to one another in the adjustment position such that an axial play of the rotary bearing is reduced.

16. The device according to claim 1, wherein a roller bearing with a radially inner bearing ring and with a radially outer bearing ring is arranged between the first support surface and the third support surface.

17. The device according to claim 16, wherein one of the bearing rings is axially supported by the first support surface but not by the third support surface, and the other of the bearing rings is axially supported by the third support surface, but not by the first support surface.

18. The device according to claim 1, wherein a roller bearing with a radially inner bearing ring and a radially outer bearing ring is arranged between the second support surface and the fourth support surface.

19. The device according to claim 18, wherein one of the bearing rings is axially supported by the second support surface but not by the fourth support surface, and the other of the bearing rings is axially supported by the fourth support surface, but not by the second support surface.

20. The device according to claim 1, wherein the rotary bearing is a roller bearing arrangement comprises two roller bearings, and one of the roller bearings is arranged between the first support surface and the third support surface and the other of the roller bearings is arranged between the second support surface and the fourth support surface, the support surface of the device for reducing play being formed such that, in the adjustment engagement of the device for reducing play, it can have contact neither with the rotation member nor with the bearing body, but only with one of the roller bearings.

21. The device according to claim 20, wherein the support surface of the device for reducing play is formed such that, in the adjustment engagement of the device for reducing play, said support surface contacts just one of the bearing rings of one of the roller bearings.

22. The device according to claim 1, wherein the device for reducing play, in the adjustment position, is connected cohesively either to the bearing body or to the rotation member.

23. The device according to claim 1, wherein the device for reducing play comprises an inherently axially rigid adjustment member.

24. The device according to claim 1, wherein the rotation member forms the third support surface and the fourth support surface in one piece.

25. The device according to claim 1, wherein the device for reducing play is in adjustment engagement with the bearing body.

26. The device according to claim 25, wherein the adjustment engagement is based on a form fit and force fit.

27. The device according to claim 26, wherein the adjustment engagement is a threaded engagement.

28. The device according to claim 27, wherein the bearing body is a sleeve body surrounding the rotation member and having an inner thread in threaded engagement with an outer thread of the device for reducing play.

29. The device according to claim 1, wherein the translation member and the rotation member each form at least one engagement flank and, by the engagement flanks, are in a flank engagement such that the rotation movement of the rotation member produces the translation movement of the translation member, and wherein a further device for reducing play is provided which, in an adjustment engagement with the translation member and the rotation member, is displaced relative to the translation member and the rotation member into an adjustment position and is secured in the adjustment position such that an axial play of the flank engagement is reduced.

30. The device according to claim 29, wherein the flank engagement is a threaded engagement.

31. The device according to claim 29, wherein the adjustment engagement of the further device for reducing play with the translation member is a threaded engagement.

32. The device according to claim 29, wherein the adjustment engagement of the further device for reducing play with the rotation member is a threaded engagement.

33. A device for administering an injectable substance, the device comprising a housing, a translation member moveable in a translation movement, a rotation member rotatably moveable about a rotation axis and coupled to the translation member to support the translation member counter to the translation movement, a rotary bearing including a bearing body bearing the rotation member rotatably about the rotation axis, the rotary bearing having support surfaces for supporting the rotation member axially on the bearing body, and a device for reducing play whereby at least two support surfaces are brought into contact with a pressing force, thereby reducing an axial play of the rotary bearing.

34. The device according to claim 33, wherein one of the translation and rotation movements produces the other.

35. The device according to claim 34, wherein the support surfaces comprise a first, second, third and fourth support surface, the first support surface and the second support surface being connected axially rigidly to the bearing body and either facing away from one another axially or facing towards one another axially, and the third support surface facing axially towards the first support surface and the fourth support surface facing axially towards the second support surface and being axially rigidly connected to the rotation member.