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US 4,932,969 AGranted
Joint endoprosthesis
AssigneeSulzer Brothers Limited
InventorsOtto Frey, Rudolf Koch, Heinrich M. F. Planck
Life of this patent
Estimating the term…
Abstract
The joint endoprosthesis is formed of a compressible elastic hollow body which is disposed between two anchoring elements. The hollow body defines a closed cavity which is filled with an incompressible fluid medium. Compressive loadings near the edges of the endoprosthesis cause a displacement of the liquid into relieved regions of the prosthesis so as to avoid tensile forces from occurring in the anchoring of the prosthesis to the bones.
Claims9
A joint endoprosthesis comprising
- an elastic compressible hollow body having a plurality of partitions defining a plurality of cavities therein and passage openings in said partitions communicating said cavities;
- an incompressible body-compatible fluid medium filling said, said medium being selected from the group consisting of physiological sodium chloride and silicon oil and being free to move from cavity to cavity to effect liquid equalization between stressed and unstressed cavities during stressing;
- and
- anchoring elements on said body for securing said body between and to two bones.
1 more element
An intervertebral endoprosthesis for implantation between two vertebral bodies comprising
- an elastic compressible hollow body having a plurality of partitions defining a plurality of cavities therein and passage openings in said partitions communicating said cavities therein;
- an incompressible body-compatible fluid medium filling said cavities to render said body at least approximately incompressible in an axial direction thereof wherein under a decentralized load said fluid medium is free to move from cavity to cavity to effect liquid equalization between stressed and unstressed cavities during stressing whereby said fluid medium shifts to a load remote region of said body for expansion thereof to reduce tensile stresses thereat;
- and
- anchoring elements on said body for securing said body between and to two vertebral bodies.
1 more element
Dependencies are inferred from the claim text.