Drive system seal

• US 7,063,684 B2
• Filed: 02/19/2003
• Issued: 06/20/2006
• Est. Priority Date: 10/28/1999
• Status: Expired due to Fees

• Current Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Inventors: Moberg, Sheldon B.
• Primary Examiner(s): RODRIGUEZ, CRIS LOIREN
• Application Number:
  US10/369,438
• Publication Number:
  US 20030167039A1
• Time in Patent Office: 1,217 Days
• Field of Search: 604/181, 604/221, 604/213, 604/218, 604/187, 604/220, 604/228, 604/224, 604/235, 604/152, 604/154, 604/131, 604/151, 604/155, 604/121, 604/123, 128/DIG.1, 128/DIG.12, 128/DIG.13, 600/432
• US Class Current: 604/155
• CPC Class Codes: A61M 5/1456 with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir
• CPC Class Codes: Y10S 128/01 Motorized syringe
• CPC Class Codes: Y10S 128/12 Pressure infusion

Abstract

A pump for dispensing a fluid from a reservoir provides a drive system seal within the pump. The pump includes a reservoir cavity adapted to receive the reservoir, and a drive system. The pump also includes at least one plunger slider having one end coupled to the drive system and the other end coupled to the reservoir. The plunger slider is adapted to translate from a retracted position to an extended position to dispense the fluid from the reservoir in response to actuation by the drive system. The pump further includes a sealing ring mounted around the plunger slider, and a spring disposed within the sealing ring. The sealing ring with the spring disposed therein is adapted to allow the plunger slider to translate from the retracted position to the extended position, and to prevent entry of fluid from the reservoir cavity into the drive system.

Claims

1. An apparatus for dispensing a medication fluid from a reservoir adapted to contain the fluid, the apparatus comprising:

a reservoir cavity adapted to receive the reservoir;

a drive system;

at least one plunger slider having one end coupled to the drive system and the other end releasably coupled to the reservoir, wherein the at least one plunger slider is adapted to translate from a retracted position to an extended position to dispense the fluid from the reservoir in response to actuation by the drive system;

a sealing ring mounted around the at least one plunger slider; and

a spring disposed within the sealing ring, wherein the sealing ring with the spring disposed therein is adapted to allow the at least one plunger slider to translate from the retracted position to the extended position and to prevent entry of fluid from the reservoir cavity into the drive system.

2. The apparatus of claim 1, wherein the sealing ring is formed from Teflon.

3. The apparatus of claim 1, wherein the sealing ring is formed from plastic.

4. The apparatus of claim 1, wherein the spring is a leaf spring.

5. The apparatus of claim 1, wherein the spring is a canted coil spring.

6. The apparatus of claim 1, wherein the sealing ring has a proximate side and a distal side, the proximate side being adjacent to the reservoir cavity, and the distal side defining an opening leading into a cavity, wherein the spring is inserted into the cavity in the sealing ring.

7. The apparatus of claim 1, wherein the sealing ring has a proximate side and a distal side, the proximate side being adjacent to the reservoir cavity and defining an opening leading into a cavity, wherein the spring is inserted into the cavity in the sealing ring.

8. The apparatus of claim 1, wherein the spring is enclosed within the sealing ring.

9. The apparatus of claim 1, wherein the drive system comprises:

a drive motor; and

a drive gear positioned to be rotatably actuated by the drive motor, said drive gear having external threads;

wherein the at least one plunger slider has internal threads positioned to be engaged by the external threads of the drive gear and is adapted to be linearly actuated by rotation of the external threads of the drive gear.

10. The apparatus of claim 1, wherein the drive system comprises:

a drive motor having a rotating drive shaft; and

a gearbox coupled to the drive shaft of the drive motor; and

wherein the at least one plunger slider is coupled to the gearbox and adapted to translate from the refracted position to the extended position in response to rotation of the drive shaft of the drive motor.

11. The apparatus of claim 10, wherein the at least one plunger slider substantially radially surrounds at least a portion of a length of the gearbox when the at least one plunger slider is in the refracted position.

12. An apparatus for dispensing a medication fluid from a reservoir adapted to contain the fluid, the apparatus comprising:

a reservoir cavity adapted to receive the reservoir;

a drive motor;

a drive gear coupled to the drive motor and adapted to be rotatably actuated by the drive motor;

at least one plunger slider having one end coupled to the drive gear and the other end releasably coupled to the reservoir, wherein the at least one plunger slider is adapted to be linearly actuated from a retracted position to an extended position to dispense the fluid from the reservoir in response to rotation by the drive gear;

a sealing ring mounted around the at least one plunger slider; and

a spring disposed within the sealing ring, wherein the sealing ring with the spring disposed therein is adapted to allow the at least one plunger slider to translate from the refracted position to the extended position and to prevent entry of fluid from the reservoir cavity into the drive system.

13. The apparatus of claim 12, wherein the sealing ring is formed from Teflon.

14. The apparatus of claim 12, wherein the sealing ring is formed from plastic.

15. The apparatus of claim 12, wherein the spring is a leaf spring.

16. The apparatus of claim 12, wherein the spring is a canted coil spring.

17. The apparatus of claim 12, wherein the sealing ring has a proximate side and a distal side, the proximate side being adjacent to the reservoir cavity, and the distal side defining an opening leading into a cavity, wherein the spring is inserted into the cavity in the sealing ring.

18. The apparatus of claim 12, wherein the sealing ring has a proximate side and a distal side, the proximate side being adjacent to the reservoir cavity and defining an opening leading into a cavity, wherein the spring is inserted into the cavity in the sealing ring.

19. The apparatus of claim 12, wherein the spring is enclosed within the sealing ring.

20. The apparatus of claim 12, wherein the drive gear has external threads, and wherein the at least one plunger slider has internal threads positioned to be engaged by the external threads of the drive gear and is adapted to be linearly actuated by rotation of the external threads of the drive gear.