Etex Corporation

Atul Nagras

Dosuk D Lee

Pramod Chakravarthy

Anthony M Majahad

A method of obtaining a porous titanium surface suitable for medical implants is provided. The titanium surface is exposed to a plasma comprising a reactive plasma gas, the reactive plasma gas comprising an active etching species and a sputtering gas. The plasma conditions are effective to modify the titanium surface and provide surface porosity. The plasma conditions are effective to non-uniformly etch and sputter the titanium surface.

Surface modification of medical implants

An irregularly etched metallic medical implant device is provided having random non-uniform relief patterns on the surface ranging from about 0.3 &mgr;m to less than about 20 &mgr;m in depth. The random, irregular surface as defined by the etch micromorphology and respective dimensional properties is sobtained by exposing a surface to a reactive plasma in a chamber wherein said reactive plasma produces a reaction product with the surface to thereby etch the surface, said reaction product or a complex thereof having a vapor pressure lower than a pressure in the chamber; providing a dynamic masking agent during the etching process; and removing the reaction products.

An irregularly etched medical implant device is provided having random non-uniform relief patterns on the surface ranging from about 0.3 .mu.m to less than about 20 .mu.m in depth. The random, irregular surface as defined by the etch micromorphology and respective dimensional properties are obtained by exposing a surface to a reactive plasma in a chamber wherein said reactive plasma produces a reaction product with the surface to thereby etch the surface, said reaction product or a complex thereof having a vapor pressure lower than a pressure in the chamber; providing a dynamic masking agent during the etching process; and removing the reaction products.

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Somerville, MA, United States of America

Atul Nagras