Infusion pumps and plunger pusher position-responsive cartridge lock for infusion pumps

• US 8,430,849 B2
• Filed: 09/24/2010
• Issued: 04/30/2013
• Est. Priority Date: 09/24/2010
• Status: Active Grant

• Current Assignee: Medtronic Minimed Incorporated (Medtronic Plc)
• Original Assignee: PerQFlo, LLC
• Inventors: Smith, Roger E., Causey, James, He, Tom Xiaohai
• Primary Examiner(s): Bouchelle, Laura A
• Assistant Examiner(s): Price, Nathan R
• Application Number:
  US12/890,277
• Publication Number:
  US 20120078183A1
• Time in Patent Office: 949 Days
• Field of Search: 604/67, 604/154, 604/155
• US Class Current: 604/155
• CPC Class Codes: A61M 2005/16863 Occlusion detection
• CPC Class Codes: A61M 2205/073 Syringe, piston type
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/502 User interfaces, e.g. screens or keyboards
• CPC Class Codes: A61M 5/14216 Reciprocating piston type
• CPC Class Codes: A61M 5/1452 pressurised by means of pistons
• CPC Class Codes: A61M 5/14546 Front-loading type injectors
• CPC Class Codes: A61M 5/16804 Flow controllers
• CPC Class Codes: A61M 5/16854 by monitoring line pressure
• CPC Class Codes: A61M 5/16877 Adjusting flow; Devices for setting a flow rate
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

Ambulatory infusion pumps, pump assemblies, cartridges, baseplates, cannulas, insertion tools, and related components as well as combinations thereof and related methods.

Claims

1. An infusion pump apparatus, comprising:

a housing having therein a cartridge receiving area, a plunger pusher that is movable between a retracted position and an extended position, and a drive mechanism, including a motor, that drives the plunger pusher;

a contact member that is biased to a cartridge lock position, where an end thereof extends into the cartridge receiving area, and is movable relative to the cartridge receiving area to an unlock position;

the plunger pusher and contact member being operably connected to one another such that the contact member will be locked in the lock position in response to the plunger pusher moving out of the retracted position; and

a medicament cartridge, having a medicament reservoir and a plunger, positionable in an inserted position in the cartridge receiving area;

the contact member, the cartridge receiving area and the cartridge being configured such that the cartridge will be locked in the cartridge receiving area when the contact member is in the lock position; and

the contact member, the cartridge receiving area and the cartridge being configured such that the cartridge can be inserted into or removed from the inserted position when the contact member is in the unlock position.

2. An apparatus as claimed in claim 1, wherein the contact member when blocked from rearward movement is blocked by frictional engagement with a spring-biased member.

3. An apparatus as claimed in claim 2, wherein the spring-biased member is repositioned away from the frictional engagement to a different position that allows the contact member to retract when the plunger pusher is in the retracted position.

4. An apparatus as claimed in claim 1, wherein the contact member, when locking the cartridge in the cartridge receiving area, is positioned in a groove in the cartridge.

5. An apparatus as claimed in claim 1, wherein the contact member is part of a releasable, linear one-way clutch.

6. An apparatus as claimed in claim 1, wherein the contact member has a waterproof o-ring sealing surface and the plunger pusher has a waterproof o-ring sealing surface.

7. An apparatus as claimed in claim 1, wherein the plunger pusher and contact member are operably connected to one another such that the contact member will be permitted to move to the unlock position in response to the plunger pusher returning to the retracted position.

8. An infusion pump apparatus, comprising:

a housing having therein a cartridge receiving area, a plunger pusher and a drive mechanism, including a motor, that drives the plunger pusher;

a contact member biased forward so that an end thereof extends into the cartridge receiving area;

a spring-biased member movable between an engaged position, where the spring-biased member frictionally engages the contact member, and a different position;

a pivot member that is pivoted by action of the plunger pusher on the pivot member when the plunger pusher is in the retracted position to move the spring-biased member to the different position; and

a medicament cartridge, having a medicament reservoir and a plunger, positionable in an inserted position in the cartridge receiving area;

the contact member, with the cartridge in the inserted position and the plunger pusher in a non-retracted position, being blocked from rearward movement relative to the cartridge receiving area by frictional engagement with the spring-biased member and thereby locking the cartridge in the cartridge receiving area; and

the spring-biased member being repositioned to the different position, when the plunger pusher is in the retracted position, thereby allowing the contact member to retract relative to the receiving area and the cartridge to be inserted into or removed from the inserted position.

9. An apparatus as claimed in claim 8, wherein the pivot member is a half-ball toggle.

10. An infusion pump apparatus comprising:

a housing having a cartridge receiving area;

a plunger pusher, associated with the housing, that is movable between a retracted position and an extended position where a portion thereof is located in the cartridge receiving area;

a drive mechanism, associated with the housing and including a motor, that drives the plunger pusher;

a cartridge, having a medicament reservoir and a plunger, in the cartridge receiving area; and

a cartridge locking assembly, including a contact member that is movable between a first position that prevents removal of the cartridge from the cartridge receiving area and a second position that does not prevent removal of the cartridge from the cartridge receiving area, that prevents and permits movement of the contact member as a function of the location of the plunger pusher;

wherein the plunger pusher prevents the contact member from moving from the first position to the second position when the plunger pusher is in the extended position; and

wherein the plunger pusher does not prevent the contact member from moving from the first position to the second position when the plunger pusher is in the retracted position.

11. An apparatus as claimed in claim 10, wherein the contact member is biased to the first position.

12. An apparatus as claimed in claim 10, wherein the contact member is biased to the first position.

13. An apparatus as claimed in claim 10, wherein

the cartridge locking assembly includes a spring-biased member that is movable between a first position, where the spring-biased member frictionally engages the contact member and prevents movement of the contact member from the first position to the second position, and a second position where the spring-biased member does not prevent movement of the contact member from the first position to the second position.

14. An apparatus as claimed in claim 13, wherein the plunger pusher drives the spring-biased member from the first position to the second position as the plunger pusher reaches the retracted position.

15. An apparatus as claimed in claim 13, wherein the plunger pusher holds the spring-biased member in the second position when the plunger pusher is in the retracted position.

16. An apparatus as claimed in claim 10, wherein

the cartridge includes a groove;

and

a portion of the contact member is positioned within the groove when the cartridge is in the cartridge receiving area and the contact member is in the first position.