Method of making a prosthetic device

Abstract

Abstract THIS IS A METHOD FOR MAKING A PROSTHETIC DEVICE FOR IMPLANTATION IN A LIVING BODY. THE METHOD COMPRISES THE STEPS OF FORMING A SUBSTRATE OF A MATERIAL STABLE AT TEMPERATURE OF AT LEAST ABOUT 1350* C., HEATING SAID SUBSTRATE TOGETHER WITH PARTICULATE MATERIAL TO PROVIDE ADDITIONAL DEPOSITION SURFACE AREA TO A TEMPERATURE OF BETWEEN ABOUT 1350* C. AND ABOUT 1600* C. IN A REACTION CHAMBER, FLOWING A MIXTURE OF PROPANE OR BUTANE AND AN INERT GAS THROUGH SAID REACTION CHAMBER AT ATMOSPHERIC PRESSURE, SAID PROPANE OR BUTANE CONSTITUTING BETWEEN ABOUT 15 VOLUME PERCENT AND ABOUT 40 VOLUME PERCENT OF SAID MIXTURE, SO THAT SAID SUBSTRATE BECOMES COATED WITH ISOTROPIC PYROLYTIC CARBON HAVING A BAF BETWEEN 1.0 AND 2.0, HAVING AN APPARENT CRYSTALLITE SIZE OF ABOUT 50 A. OR LESS AND HAVING A DENSITY OF AT LEAST ABOUT 1.5 GRAMS PER CM.3, AND CONTINUING SAID GAS FLOW UNTIL THE THICKNESS OF SAID ISOTROPIC CARBON DEPOSIT IS AT LEAST ABOUT 50 MICRONS, WHEREBY A DEVICE IS PRODUCED WHICH HAS EXCELLENT COMPATIBILITY WITH BODY TISSUE AND IS NONTHROMBOGENIC. IF DESIRED, THE HYDROCARBON GAS MIXTURE MAY CONTAIN A CARBIDE-FORMING ELEMENT SELECTED FROM THE GROUP CONSISTING OF SILICON, ZIRCONIUM, TITANIUM, TANTALUM, BORON, TUNGSTEN, NIOBIUM, VANADIUM, MOLYBDENUM, ALUMINUM, OR HAFNIUM.

Inventors

• 👤 Jack C Bokros
• 👤 Willard H Ellis

Bibliographic Details