Transdermal intraosseous device

1. A transdermal intraosseous device comprising:

a transdermal adapter configured for connection to an external prosthetic device and configured for use with a bone, the transdermal adapter including:

a metal dome-shaped portion configured for transcutaneous implantation;

a polished metal external shaft having a longitudinal axis and extending from the metal dome-shaped portion; and

a dermal transition structure defining a controlled roughness gradient from the dome-shaped portion of the transdermal adapter to the polished metal external shaft and configured for engagement with a dermis layer of a patient for infection control, the dermal transition structure including:

a porous metal dome-shaped structure surrounding and overlaying the dome-shaped portion of the transdermal adapter;

a first transitional surface treatment layer and a second transitional surface treatment layer both between a sidewall of the polished external shaft and the porous metal dome-shaped structure, the first and second layers aligned along the longitudinal axis of the polished metal external shaft;

the first transitional surface treatment layer roughened by blasting and configured for direct engagement with the dermis layer upon implantation of the device; and

the second transitional surface treatment layer roughened by a combination of blasting treatment and acid-etching treatment and configured for direct engagement with the dermis layer upon implantation of the device; and

a bone fixator including a tapered distal portion received into a tapered bore of the dome-shaped portion of the transdermal adapter via a taper-to-taper connection, a proximal portion configured for anchoring into the bone and a skirt-shaped collar between the distal portion and the proximal portion;

wherein the first transitional surface treatment layer is contiguous with the porous metal dome-shaped structure and is between the porous metal dome-shaped structure and the second transitional surface treatment layer, which abuts the sidewall of the polished metal external shaft; and

wherein the first and the second transitional surface treatment layers provide a gradual transition from the polished metal external shaft to a rough surface of the porous metal dome-shaped structure through the first and the second transitional surface treatment layers, the first transitional surface treatment layer has a greater roughness than the second transitional surface treatment layer.

2. The transdermal intraosseous device of claim 1 , wherein the dome shaped portion of the transdermal adapter includes an extension with a circumferential groove coupled to a redundant connector between the bone fixator and the transdermal adapter.

3. The transdermal intraosseous device of claim 1 , wherein the bone fixator includes a compliant biasing member within a bore formed in the distal portion of the bone fixator, wherein the compliant biasing member is pre-stressed and configured to provide compressive force to the bone.

4. The transdermal intraosseous device of claim 1 , wherein the blasting treatment is selected from ceramic bead blasting, sand blasting and grit blasting.

5. The transdermal intraosseous device of claim 1 , further comprising a centering sleeve having an outer surface engageable with a bore in the bone and an inner surface receiving the proximal portion of the bone fixator.

6. The transdermal intraosseous device of claim 1 , wherein an outer surface of a centering sleeve is patient-specific and configured to mate with a bore of the bone based on a preoperative plan for the patient.

7. The transdermal intraosseous device of claim 1 , wherein the porous metal dome-shaped structure has an average porosity of about 67 percent.

8. The transdermal intraosseous device of claim 1 , wherein the porous metal dome-shaped structure has pore size ranging from about 100 to about 600 microns.

9. The transdermal intraosseous device of claim 1 , wherein the porous metal dome-shaped structure has average pore size of about 300 microns.

10. The transdermal intraosseous device of claim 1 , wherein the first and second transitional surface treatment layers extend annularly about the polished metal external shaft.

11. The transdermal intraosseous device of claim 1 , wherein the first and second transitional surface treatment layers are each configured to align with the dermis layer.