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Injectable infusion pump apparatus for implanting long-term dispensing module and medication in an animal and method therefor

  • US 4,834,704 A
  • Filed: 04/13/1988
  • Issued: 05/30/1989
  • Est. Priority Date: 04/13/1988
  • Status: Expired due to Fees
First Claim
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1. Injectable infusion pump apparatus for implanting a long-term dispensing module and medication into a body cavity of an animal comprising:

  • an elongate body having a cannula extending from one end and a chamber communicating with said cannula open to an opposite end, the distal end of said cannula being cut at an acute angle;

    a plug slidably retained within said cannula, said plug having a fluid flow restrictor orifice therethrough;

    a hollow elastic reservoir having said plug affixed in one end to seal off said one end and having a self-sealing septum at an opposite end, said reservoir being disposed within said cannula;

    a syringe barrel slidably disposed in said chamber having a tubular extension projecting into said cannula abutting said opposite end of said reservoir, the distal end of said extension having a reduced-size projection penetrating said septum, said syringe barrel having a fluid receiving cavity and a fluid flow passage leading therefrom through said tubular extension and said reduced-size projection into said reservoir;

    a quantity of fluid medication in said syringe barrel cavity; and

    a plunger slidably disposed in said syringe barrel cavity;

    depression of said syringe barrel into said body chamber causing said extension to eject said reservoir and said plug out the distal end of said cannula; and

    depression of said plunger into said syringe barrel cavity injecting said medication into said reservoir through said fluid flow passage to elastically expand said reservoir, elasticity of said expanded reservoir providing a pressure on medication therein to force said medication through said flow restrictor orifice at a predetermined rate.

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