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Implantable infusion pump

  • US 5,722,957 A
  • Filed: 03/15/1996
  • Issued: 03/03/1998
  • Est. Priority Date: 03/17/1995
  • Status: Expired due to Term
First Claim
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1. An implantable infusion pump for the dosed administration of medication into the human body, comprising a pumping chamber, which is formed by a lower chamber part and an upper chamber part connected thereto, whereina) the implantable pumping chamber is divided by a gas impermeable flexible partition into two subchambers,b) the first subchamber is delimited by the upper chamber part and the flexible partition and designed as a reservoir for medicinal solutions, the upper part of the chamber has a refill opening which is sealed by at least one piercable septum, and the reservoir for medicinal solutions is connected via an outlet opening to an outlet catheter, andc) the second subchamber is delimited by the lower chamber part and the flexible partition and is designed as a pressure chamber accommodating a halogenized hydrocarbon propellant, wherein the propellant is hexafluorobutane.

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