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US5358533: Sintered coatings for implantable prostheses

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Filing Information

Inventor(s) Douglas G. Noiles · DeCarlo, Jr.; Alfred F. ·
Assignee(s) Joint Medical Products Corporation ·
Attorney/Agent(s) Maurice M. Klee ·
Primary Examiner Randall L. Green ·
Assistant Examiner Dinh X. Nguyen ·
Application Number US8007059
Filing date 01/21/1993
Issue date 10/25/1994
Predicted expiration date 02/19/2012
U.S. Classifications 623/22  · 623/23  ·
International Classifications A61F 232  ·
Kind CodeA
International Classifications 62322;23;18;16 ·
Related U.S. Application DataThis application is a divisional application of copending application Ser. No. 07/838,577 filed on Feb. 19, 1992, now U.S. Pat. No. 5,263,986.
4 Claims, No Drawings


Abstract

A sinterable coating for an implantable prosthesis is provided having 1) interstices into which tissue or bone can grow, and 2) increased surface roughness which provides enhanced initial press-fit fixation. The coating includes at least two sets of particles having different mean diameters. The sizes and numbers of particles are chosen so as to produce a matrix of smaller particles in which are embedded a lesser number of spaced-apart larger particles. The smaller particles provide support for the larger particles, and the larger particles stand proud of the smaller particles to provide the enhanced surface roughness.

Independent Claims | See all claims (4)

  1. 1. An acetabular prosthesis for implantation in bone comprising a body having a substantially spherical outer surface at least a portion of which is stepped, said substantially spherical outer surface defining a pole, and said steps:a) having similar radial cross-sectional shapes irrespective of their azimuthal locations on the surface of the prosthesis, andb) being substantially covered with a sintered coating of particles,each of said steps comprising a tread and a riser which intersect at a corner, said tread and riser being oriented so that the step opens towards the pole at said corner, whereby, when the prosthesis is implanted in bone, the forces between the bone and the sintered coating tend to drive the particles of the sintered coating into the corner.

References Cited

U.S. Patent Documents

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Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
DE2911754REIMER HANS DROct 1980
FR2590478LAHILLE MICHELMay 1987
FR2651675MENDOLIA GEORGESMar 1991