Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1996-09-16
1999-12-28
Yu, Mickey
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
623 11, 623 18, 623 22, 623 23, A61F 228
Patent
active
060084316
ABSTRACT:
A bone prosthesis has a growth enhancement coating recessed in and protected by its surface topography. The topographic features define gaps under a few millimeters which are readily spanned by new bone growth, while the features protect the coating from abrasion or physical damage. The topographic features substantially surround the coated regions, and prevent migration of flakes spalled during implantation or microparticles shed by the coating as it is resorbed or incorporated in new bone over time. In a preferred embodiment, edge features cast in the surface of a metal prosthesis include dovetail, undercut or skewed faces which firmly interlock with newly-growing bone to form a strong and shear-free, substantially rigid attachment. The prosthesis may be cast in a mold having a complex surface interlock texture, and these molds may be mass produced by an iterative three-dimensional printing technique to build each mold up in layers in the form of a suitable casting negative. The prosthesis is then cast of molten metal in the mold, and the mold material is broken away and cleaned off, e.g., by an etch. A growth enhancer such as hydroxyapatite (HA) is plasma-sprayed to selectively deposit on and completely cover the floors of the recesses formed in the casting. Preferably, the upper surfaces about the recesses are polished, and the recess walls are overhung so they are masked from the coating process, causing the HA coating to adhere only in the protected floor regions. The HA floors are at the bottom of pits or macropores, at a depth of under three millimeters, and preferably one-half to two millimeters, so that new bone growth spans the gaps and penetrates into the prosthesis over an extended surface textured region.
REFERENCES:
patent: 4179485 (1979-12-01), Tritten
patent: 4722870 (1988-02-01), White
patent: 4795472 (1989-01-01), Crowninshield et al.
patent: 4813959 (1989-03-01), Cremascoli
patent: 4865603 (1989-09-01), Noiles
patent: 4871578 (1989-10-01), Adam et al.
patent: 4878914 (1989-11-01), Miwa et al.
patent: 4944759 (1990-07-01), Mallory et al.
patent: 5007931 (1991-04-01), Smith
patent: 5042560 (1991-08-01), Ahlers
patent: 5108435 (1992-04-01), Gustavson et al.
patent: 5128146 (1992-07-01), Hirayama et al.
patent: 5204055 (1993-04-01), Sachs et al.
patent: 5258098 (1993-11-01), Wagner et al.
patent: 5344457 (1994-09-01), Pilliar et al.
patent: 5507815 (1996-04-01), Wagner et al.
patent: 5507833 (1996-04-01), Bohn
patent: 5514184 (1996-05-01), Doi et al.
patent: 5658334 (1997-08-01), Caldarise et al.
patent: 5665118 (1997-09-01), Lasalle et al.
Besemer John W.
Caldarise Salvatore
Foley Frank R.
Ritchie Allan
Cuddihy Francis K.
Johnson & Johnson Professional Inc.
Yu Mickey
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