Patent ID: 9254194
Filing Date: 2016-02-09
CPC Classification: A61F,B24C

Claim Text:
1. A method for forming a controlled roughness gradient transition between an external prosthetic device for a bone of a patient and the corresponding dermis of the patient, the method comprising: positioning a porous metal dome-shaped structure around a metal dome-shaped portion of a transdermal adapter; roughening a first portion of an external shaft extending from the dome-shaped portion of the transdermal adapter by blasting to a first roughness, the first portion extending above the porous metal dome-shaped structure along a longitudinal axis of the external shaft, the first portion is adjacent the porous metal dome-shaped structure; and roughening a second portion of the external shaft by a combination of blasting and acid etching to a second roughness, the second portion extending above the first portion along the longitudinal axis of the external shaft, both the first portion and the second portion are between a sidewall of the external shaft and the porous metal dome-shaped structure such that the second porous portion abuts the sidewall; wherein the porous metal dome-shaped portion and the first and second portions of the external shaft are configured to directly contact the dermis for infection control; and wherein the first and the second portions provide a gradual transition from a polished portion of the external shaft to a rough surface of the porous metal dome-shaped structure through the first and the second portions of the external shaft.