Prosthesis (i.e. – artificial body members) – parts thereof – or ai – Implantable prosthesis – Bone
Patent
1996-02-06
1998-03-03
Isabella, David
Prosthesis (i.e., artificial body members), parts thereof, or ai
Implantable prosthesis
Bone
606 61, 606 73, A61F 244
Patent
active
057230137
ABSTRACT:
An implant for replacing a removed vertebra includes an outer sleeve having a longitudinal axis and a peripheral inner surface. The inner surface has a series of axially adjoining, peripheral grooves lending the inner surface a sawtooth-shaped configuration when viewing the inner sleeve in axial section. The implant further includes an inner sleeve having a longitudinal axis and a peripheral outer surface. The outer surface has a series of axially adjoining, peripheral ribs lending the outer surface a sawtooth-shaped configuration when viewing the inner sleeve in axial section. The inner sleeve is telescopingly received in the outer sleeve such that the series of axially adjoining, peripheral ribs of the outer surface engage into the series of axially adjoining, peripheral grooves of the surface in an interfitting relationship. The sawtooth-shaped configurations of the inner and outer surfaces are oriented such that in normal operation the sleeves are prevented by the interengaging sawtooth configurations from being telescoped into one another, but are allowed by ratchet action to telescope outwardly from one another. The inner sleeve is radially sufficiently resilient to allow alternating radial compression and expansion during the ratchet action.
REFERENCES:
patent: 4157715 (1979-06-01), Westerhoff
patent: 4567884 (1986-02-01), Edwards
patent: 4657550 (1987-04-01), Daher
patent: 4870957 (1989-10-01), Goble et al.
patent: 4892545 (1990-01-01), Day et al.
patent: 5290312 (1994-03-01), Kojimoto et al.
Ameil Marc
Dinville Herve
Gau Michel
Huppert Jean
Jeanson Jean-Francois
Isabella David
JBS S.A.
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