An implantable infusion pump consists of a hollow titanium disk separated into two chambers by a collapsible bellow (1-3). At body temperature the vapor pressure exerted on the bellow by the fluorocarbon in one chamber forces the medication in the other chamber through a regulator, from which it is delivered into the body at a constant rate. The pump is placed below the skin in a procedure similar to that used for a permanent cardiac pacemaker. It is refilled with medication by percutaneous injection through a self-sealing septum. The pump is approximately 3- X 8-cm and it weighs approximately 253 g
Implantable and External Infusion Pumps for the Treatment of Thromboembolic Disease in Outpatients. Ann Intern Med. ;100:305–306. doi: 10.7326/0003-4819-100-2-305
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Published: Ann Intern Med. 1984;100(2):305-306.
Healthcare Delivery and Policy, Prevention/Screening.
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