Cardiovascular prosthetic devices and implants with porous systems
First Claim
1. A controlled release device in the form of a heart pacemaker electrode comprising a hollow chamber formed in said electrode containing a source of material to be released to heart tissue engaged by said electrode and a porous tissue-engaging surface of said electrode communicating with said chamber through a network of interconnected pores, to permit said material to be released to said heart tissue through said network of interconnected pores, said porous surface being formed of rigid electroconductive material inert to blood, said porous surface having a porosity of at least 8% by volume up to the limit of coherence of the surface, an interstitial pore size of about 1 to about 1000 microns and a thickness up to about 1 cm.
2 Assignments
0 Petitions
Accused Products
Abstract
Novel cardiovascular prosthetic devices or implants having many useful cardiovascular applications comprise a porous surface and a network of interconnected interstitial pores below the surface in fluid flow communication with the surface pores. Tissue forms a smooth thin adherent coating or self-determining thickness on the porous surface making it resistant to the formation of the blood clots normally associated with the presence of foreign bodies in the blood stream. The device has particular utility in heart valves, pacemaker electrodes, blood pumps, blood stream filters, an artificial pancreas, vascular access tubes, small and large bore vascular grafts, blood pump diaphragms and vascular and intracardiac patches.
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Citations
5 Claims
- 1. A controlled release device in the form of a heart pacemaker electrode comprising a hollow chamber formed in said electrode containing a source of material to be released to heart tissue engaged by said electrode and a porous tissue-engaging surface of said electrode communicating with said chamber through a network of interconnected pores, to permit said material to be released to said heart tissue through said network of interconnected pores, said porous surface being formed of rigid electroconductive material inert to blood, said porous surface having a porosity of at least 8% by volume up to the limit of coherence of the surface, an interstitial pore size of about 1 to about 1000 microns and a thickness up to about 1 cm.
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5. A controlled release device comprising a source of material to be released to body tissue and a porous tissue-engaging surface communicating with said material through a network of interconnected pores to permit the same to be released to tissue engaged by said surface, said porous surface being formed or rigid electroconductive material inert to blood, said porous surface having a porosity of at least 8% by volume up to the limit of coherence of the surface, an interstitial pore size of about 10 to about 1000 microns and a thickness up to about 1 cm.
Specification