Cardiac pacemakers
First Claim
1. A case for implantation in a body, which case comprises a rigid supporting substrate of a plastics material, which substrate defines a chamber, and a skin of platinum fitted over said substrate and forming the outermost surface of the case, the skin being formed of at least two pieces of platinum, the thickness of which pieces is 0.1875 mm to 0.5 mm, the pieces of platinum being welded together along mating edges to form a hermetically-closed case surrounding and being supported by said substrate.
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Accused Products
Abstract
A case for an implantation in a human or animal body. The case comprises a rigid plastics substrate which defines a chamber and a platinum skin arranged to overlie the substrate, the skin being formed in two or more pieces welded together--for instance by electron beam welding--to form a hermetically sealed case. The platinum skin should be from 0.1875 mm to 0.5 mm thick and is biocompatible, rendering the case suitable for implanting and containing a power pack and electronic package for a cardiac pacemaker.
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Citations
12 Claims
- 1. A case for implantation in a body, which case comprises a rigid supporting substrate of a plastics material, which substrate defines a chamber, and a skin of platinum fitted over said substrate and forming the outermost surface of the case, the skin being formed of at least two pieces of platinum, the thickness of which pieces is 0.1875 mm to 0.5 mm, the pieces of platinum being welded together along mating edges to form a hermetically-closed case surrounding and being supported by said substrate.
- 9. A cardiac pacemaker system for implantation in a body, comprising an electrode catheter having a proximal end and a distal end, a plug member having an insulating body portion and a projecting conducting spigot being provided at said proximal end and an electrode for stimulating the heart being provided at said distal end, and a cardiac pacemaker case comprising a rigid substrate of a synthetic resinous plastic material in the form of two mating parts, each of which has solid walls, said two parts being mated to define a closed chamber, a power source, an electronic package to generate timed electrical pulses, said power source and said electronic package being located within said closed chamber, a socket member for receiving said plug member provided in one of said parts to allow the connection of the proximal end of the electrode catheter thereto, the socket member comprising a ceramic body defining a bore for sealingly receiving said plug member, a block of resilient conducting silicone rubber material located within said bore and having a recess for receiving the spigot of the plug member, the recess having a smaller cross-sectional dimension than that of the spigot, the socket member further comprising an electrical contact provided through the wall of the socket member defining the bore and being electrically connected to said electronic package, said contact making electrical connection with the block of conducting silicone rubber material within the bore, and a metallic flange surrounding the opening to said bore, said case further comprising a skin of platinum fitted over and supported by said rigid substrate, said skin having a thickness of from 0.1875 mm to 0.5 mm and being formed in two parts, each of which fits respectively over said two mating parts of said rigid substrate and one of said parts of the platinum skin having an aperture corresponding in shape and position to said metallic flange of the socket member, the two parts of the platinum skin being welded together and said metallic flange being welded to said one part of the platinum skin so as to form a hermetically sealed case.
Specification