Cardiovascular implants of enhanced biocompatibility
First Claim
1. A heart valve prosthesis for implantation in living body tissue of a patient, the heart valve prosthesis having enhanced hemocompatibility, comprising:
- components of a heart valve prosthesis including a valve body component and flow control components, said components at least partially fabricated from a low modulus metal alloy, the low modulus alloy being free of deliberately toxic elements, except such amounts of said toxic elements as may occur as impurities in the low modulus alloy and as contaminants as a result of an alloying process, comprising;
(i) titanium; and
(ii) niobium from a range of about 10 to about 20 wt. % niobium or from about 35 to about 50 wt. % niobium.
0 Assignments
0 Petitions
Accused Products
Abstract
Cardiovascular and other medical implants fabricated from low-modulus Ti--Nb--Zr alloys to provide enhanced biocompatibility and hemocompatibility. The cardiovascular implants may be surface hardened by oxygen or nitrogen diffusion or by coating with a tightly adherent, hard, wear-resistant, hemocompatible ceramic coating. The cardiovascular implants include heart valves, total artificial heart implants, ventricular assist devices, vascular grafts, stents, electrical signal carrying devices such as pacemaker and neurological leads, defibrillator leads, and the like. It is contemplated that the Ti--Nb--Zr alloy can be substituted as a fabrication material for any cardiovascular implant that either comes into contact with blood thereby demanding high levels of hemocompatibility, or that is subject to microfretting, corrosion, or other wear and so that a low modulus metal with a corrosion-resistant, hardened surface would be desirable.
-
Citations
19 Claims
-
1. A heart valve prosthesis for implantation in living body tissue of a patient, the heart valve prosthesis having enhanced hemocompatibility, comprising:
components of a heart valve prosthesis including a valve body component and flow control components, said components at least partially fabricated from a low modulus metal alloy, the low modulus alloy being free of deliberately toxic elements, except such amounts of said toxic elements as may occur as impurities in the low modulus alloy and as contaminants as a result of an alloying process, comprising; (i) titanium; and (ii) niobium from a range of about 10 to about 20 wt. % niobium or from about 35 to about 50 wt. % niobium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 18)
-
11. A heart valve prosthesis for implantation in living body tissue of a patient, the heart valve prosthesis having enhanced hemocompatibility, comprising:
components of a heart valve prosthesis including a valve body component and flow control components, said components at least partially fabricated from a low modulus metal alloy, the low modulus alloy being free of deliberately toxic elements, except such amounts of said toxic elements as may occur as impurities in the low modulus alloy and as contaminants as a result of an alloying process, comprising; (i) titanium; and (ii) niobium and tantalum, with a combined wt. % of niobium and tantalum selected from a range of about 10 to about 20 wt. % or from about 35 to about 50 wt. %. - View Dependent Claims (12, 13, 14, 15, 16, 17, 19)
Specification