Implantable infusion pump

US5814019A · kind A · utility

Assignee

• Fresenius AG · DE

Inventors

• Bernd Steinbach · Friedberg, DE
• Claus Walter · Glauburg, DE

Key dates

• Filing date: Mar 15, 1996
• Grant date: Sep 29, 1998
• Expiry date: Mar 15, 2016

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M5/155
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The invention refers to an implantable infusion pump for the dosed administration of medication into the human body comprising a pump chamber which is formed by a lower chamber part and an upper chamber part connected thereto, whereby the pumping chamber is divided into two subchambers by a gas impermeable flexible partition and provided as a reservoir for medicinal solutions, the upper chamber part has a refilling opening which is sealed by at least a pierceable septum and the reservoir for medicinal solutions is connected to an outlet catheter via an outlet opening and possibly an outlet reduction arrangement, and the second subchamber is delimited by the lower chamber part and the flexible partition to serve as a pressure chamber to accommodate a propellant, whereby the gas impermeable partition is a convex metal foil following the contour of the inner form of the upper part of the chamber. This metal foil may be covered on one or both sides with a polymer support film.