Electrochemical syringe pump having a sealed storage reservoir for a charge transfer medium

• US 5,971,722 A
• Filed: 09/05/1997
• Issued: 10/26/1999
• Est. Priority Date: 09/05/1997
• Status: Expired due to Fees

• Current Assignee: Baxter International Inc.
• Original Assignee: Baxter International Inc.
• Inventors: Rosati, Robert, Davis, Lisa, Maget, Henri J. R.
• Primary Examiner(s): Freay, Charles G.
• Assistant Examiner(s): EVORA, ROBERT Z
• Application Number:
  US08/924,564
• Time in Patent Office: 781 Days
• Field of Search: 204/228, 204/265, 204/266, 204/252, 429/54, 604/140, 604/134, 604/143, 417/379, 417/472, 417/473
• US Class Current: 417/379
• CPC Class Codes: A61M 2005/14204 with gas-producing electrochemical cell
• CPC Class Codes: A61M 5/14526 the piston being actuated by fluid pressure

Abstract

An electrochemically driven syringe pump for infusion of medicament wherein the pump has a detachable barrel in which medicament can be stored and subsequently infused. The pump is further adapted for storage as the charge transfer medium is sealed in a reservoir prior to activation.

Claims

1. An electrochemical syringe pump comprising:

a syringe for delivering a supply of fluid;

a plunger disposed within said syringe;

a pump housing having an inner and outer surface, said inner surface is attached to said syringe, said pump housing comprises;

an electrochemical cell;

a power supply selectively connected to said electrochemical cell;

a current control apparatus providing a limited current to said electrochemical cell from said power supply;

a perforating member defined on said inner surface of said pump housing; and

,

a sealed charge transfer medium reservoir housed between said syringe and said pump housing wherein upon engagement of said perforating member with said sealed charge transfer medium reservoir, said perforating member perforates said sealed charge transfer medium reservoir and releases a charge transfer medium contained in said reservoir to contact said electrochemical cell to assist in a chemical reaction in said cell wherein said reaction causes an increase in pressure on said plunger to deliver a predetermined amount of said fluid.

2. The invention according to claim 1 wherein said syringe further comprising a barrel wherein said barrel has a draft angle defined thereon of substantially zero.

3. The invention according to claim 2 wherein a plunger adapted to slidingly fit within said barrel and a cruciform seal retained by said plunger.

4. The invention according to claim 3 wherein said cruciform seal in combination with said draft angle provides a substantially constant force of sliding friction therebetween.

5. The invention according to claim 1 wherein said current control controls a rate of infusion of medicament from said pump.

6. The invention according to claim 1 wherein said syringe further comprises a cam having a first position and a second position wherein said first position affixes said syringe to said pump while preventing activation of said cell.

7. The invention according to claim 6 wherein said second position activates said cell.

8. The invention according to claim 1 wherein said current control is a fixed resistive element which determines a rate of infusion by controlling a current available to said cell.

9. An electrochemically driven syringe pump for delivery of medicament to a patient;

comprising a syringe for delivering a supply of medicament;

a plunger disposed within said syringe;

a pump head having an inner and outer surface wherein said inner surface is connected to said syringe;

an electrochemical cell located within said pump head;

a power supply and current control apparatus located within said pump head and selectively connected to said electrochemical cell;

said pump further comprising a reservoir, in movable attachment to said pump head, which releasably retains a charge transfer medium, wherein said reservoir is covered by a perforatable membrane and said membrane is surmounted by a perforating member, extending from said inner surface of said pump head, which perforates said membrane when said pump is activated by attachment of said syringe to said pump head thereby releasing said charge transfer medium to come into contact with said electrochemical cell so as to assist said cell in executing an electrochemical reaction which increases pressure in said syringe to move said plunger and deliver a metered amount of medicament from said syringe.

10. The invention according to claim 9 wherein said reservoir further comprises a fluid retaining area and a blotter.

11. The invention according to claim 10 wherein said blotter contacts said electrochemical cell upon activation of said pump.

12. The invention according to claim 9 wherein said perforating member is a toothed annulus.

13. A gas driven syringe pump comprising a syringe and a plunger and a

pump module housing an electrochemical cell;

said pump module having a toothed perforating member extending therefrom;

a cup-like fluid reservoir, slideably retained about said perforating member;

a sealing member placed within said reservoir wherein said sealing member is emplaced between said perforating member and a charge transfer medium retained in said reservoir;

wherein said perforating member perforates said sealing member upon activation of said pump by attachment of said pump module to said syringe wherein such attachment causes said syringe to slide said perforating member into said reservoir, thereby releasing said charge transfer medium from said reservoir to come into contact with said electrochemical cell retained within said pump module thereby assisting in an electrochemical reaction causing an increase in pressure in said syringe so as to move said plunger and deliver medicament from said syringe.

14. The invention according to claim 13 wherein said charge transfer medium being water.

15. The invention according to claim 14 wherein there is a said medium comprising a medium storage area and a medium delivery apparatus;

said apparatus comprising a blotter to deliver said medium from said storage area to said electrochemical cell.

16. The invention according to claim 15 wherein said medium storage area further comprising a rupturable cover wherein said cover is adapted to be ruptured upon engagement with said pump module.