Transdermal intraosseous device
View Patent ↗A transdermal intraosseous device includes a transdermal adapter for an external prosthetic device for a bone of a patient and a bone fixator including a distal portion coupled to the transdermal adapter and a proximal portion for anchoring into the bone. The transdermal adapter includes a dome-shaped portion for transcutaneous implantation and an external shaft extending from the dome-shaped portion. A dermal transition structure is configured to include a controlled roughness gradient from the external shaft to the dome-shaped portion and configured for use in infection control at a dermis layer of the patient.
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.
2. The method of claim 1 , wherein the porous metal dome-shaped structure has an average porosity of about 67 percent.
3. The method of claim 1 wherein the porous metal dome-shaped structure has pore size ranging from about 100 to about 600 microns.
4. The method of claim 1 , wherein the porous metal dome-shaped structure has average pore size of about 300 microns.