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US 6,132,469 AGranted
Acetabular liner extractor
AssigneeBiomet, Inc.
InventorDavid W. Schroeder
Life of this patent
Estimating the term…
Abstract
A preferred embodiment of an extractor employs a pair of arms which laterally move toward each other, thereby applying compressive forces against a first prosthetic component toward a longitudinal centerline. These compressive forces, in combination with longitudinal movement of the arms in relation to a collar of the extractor, serves to easily extract the liner from the shell.
Claims23
In combination, an acetabular prosthetic apparatus and an extractor,
- (a) the acetabular prosthetic apparatus comprising:
- a shell having an exterior surface adapted to engage an acetabulum and an interior surface;
- a liner having a partially spherical interior surface operable to receive a ball, an exterior surface of said liner engaging said interior surface of said shell, said liner being secured in said shell;
- (b) the extractor comprising:
- a first arm;
- a second arm, said arms having engagement sections;
- a collar located adjacent to said arms, said collar having a projecting edge;
- a first shaft extending through said collar and being coupled to said arms;
- said arms operably moving toward and away from each other when said shaft is respectively moved in a first direction and a second direction concurrently with said arms operably moving toward and away from said collar, said first direction being opposite of said second direction;
- and
- a substantially flat shoulder of said shell having multiple depressions;
- (c) said projecting edge of said collar abutting against said shoulder of said shell concurrently with said engagement sections of said arms being received in said multiple depressions of said shell whereby said arms are provided access to said liner;
- and
- said arms of said extractor engaging and applying inwardly compressive forces against said liner when said shaft is moved in said first direction, said collar contacting against a portion of said shell and allowing said arms to longitudinally pull said liner out of said shell when said shaft is moved in said first direction.
11 more elements
In combination, an acetabular prosthetic apparatus and an extractor,
- (a) the acetabular prosthetic apparatus comprising:
- a shell having an exterior surface adapted to engage an acetabulum and an interior surface;
- a liner having a partially spherical interior surface for receiving a ball, an exterior surface of said liner engaging said interior surface of said shell, said liner being secured in said shell;
- (b) the extractor comprising:
- a first arm;
- a second arm;
- a collar located adjacent to said arms;
- and
- a first shaft extending through said collar and being coupled to said arms;
- said arms operably moving toward and away from each other when said shaft is respectively moved in a first direction and a second direction concurrently with said arms operably moving toward and away from said collar, said first direction being opposite of said second direction;
- (c) said arms of said extractor engaging and applying inwardly compressive forces against said liner when said shaft is moved in said first direction, said collar contacting against a portion of said shell and allowing said arms to longitudinally pull said liner out of said shell when said shaft is moved in said first direction.
8 more elements
In combination, an acetabular prosthetic apparatus and an extractor,
- (a) the acetabular prosthetic apparatus comprising:
- a shell having an exterior surface adapted to engage an acetabulum and a n interior surface;
- a liner having a partially spherical interior surface for receiving a ball, an exterior surface of said liner engaging said interior surface of said shell for securing said liner in said shell;
- (b) the extractor comprising:
- a first arm;
- a second arm;
- and
- a collar located adjacent to said arms, said collar being operable to contact said shell;
- said arms being movable relative to said collar, said arms operably engaging and applying compressive forces against said liner.
6 more elements
Dependencies are inferred from the claim text.