EP0535973A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
An acetabular cup inserter
Assignee: Johnson and Johnson Professional Inc
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Filing: 1992-10-02
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Granted: —
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Expires: 2012-10-02
Abstract
Abstract This invention relates to a surgical instrument for inserting acetabular cups which may also be used to maintain pressure on the cup while the bone cement is setting. The instrument consists of a rigid central rod with a hemispherical button (300) on its forward end and a palm pad (400) on the other. A cup retainer (100) may be slid along the rod between forward and rearward positions, and a trigger mechanism (118), associated with a hand grip (116) is provided to commence rearward motion of the cup retainer (100) from its forward position. When in its forward position, the cup retainer may engage and retain an acetabular cup, as it is moved backwards, the hemispherical button holds the cup still, disengaging it from the retainer (100). The retainer (100) may then be moved to its rearward position while the cup is pressed in and excess extruded bone cement removed therefrom.
Inventors
- 👤 Frank Foley
- 👤 Edward Light
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 17:54
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/46; A61F2/4603; A61F2/4609
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
70 words
An instrument for inserting prosthetic acetabular cups including: pressure application means; and a cup retainer capable of being moved relative to the pressure application means between a forward position, in which it is adapted to engage and retain an acetabular cup, and a rearward position; wherein the pressure application means enables pressure to be continually applied to the acetabular cup, irrespective of the position relative thereto of the cup retainer.
Claim 2
Dependent Claim
37 words
An instrument according to claim 1 further including actuating means operable to move the cup retainer from its forward position to a retracted position in which it is adapted to be out of engagement with the cup.
Claim 3
Dependent Claim
22 words
An instrument according to claim 2 in which the retracted position of the cup retainer lies between its forward and rearward positions.
Claim 4
Dependent Claim
30 words
An instrument according to claim 2 or claim 3 further including a hand grip and wherein the actuating means comprises a trigger or lever mechanism associated with the hand grip.
Claim 5
Dependent Claim
17 words
An instrument according to claim 4 in which the hand grip is integral with the cup retainer.
Claim 6
Dependent Claim
17 words
An instrument according to claim 5 in which the actuating means is integral with the cup retainer.
Claim 7
Dependent Claim
36 words
An instrument according to any one of claims 4-6 in which the trigger or lever mechanism includes a manipulating portion, a pivot and an abutment portion adapted to abut against a receiving part of the instrument.
Claim 8
Dependent Claim
19 words
An instrument according to any preceding claim further including means for retaining the cup retainer in its rearward position.
Claim 9
Dependent Claim
24 words
An instrument according to claim 8 in which the means for retaining the cup retainer in its rearward position comprises a clip or latch.
Claim 10
Dependent Claim
44 words
An instrument according to any preceding claim in which the pressure application means comprises a rigid central rod adapted at its forward end to engage the central recess of the cup, the cup retainer comprising an external sleeve capable of sliding along the rod.
Claim 11
Dependent Claim
34 words
An instrument according to claim 10 wherein the central rod includes a stop surface adapted to abut a complementary stop surface on the cup retainer when the cup retainer is in its forward position.
Claim 12
Dependent Claim
38 words
An instrument according to claim 11 in which the central rod comprises a forward portion of relatively large cross-sectional area and a rearward portion of relatively small cross-sectional area, the transition between the two forming the stop surface.
Claim 13
Dependent Claim
90 words
An instrument according to claim 6 in which the trigger or lever mechanism includes a manipulating portion, a pivot axis and an abutment portion, and the pressure application means comprises a rigid central rod adapted at its forward end to engage the central recess of the cup, the cup retainer comprising an external sleeve capable of sliding along the rod, the rod including a stop surface adapted to abut a complementary stop surface on the abutment portion of the trigger mechanism when the cup retainer is in its forward position.
Claim 14
Dependent Claim
31 words
An instrument according to any one of claims 10-13 in which the central rod includes, at its forward end a substantially hemispherical button and, at its rearward end a palm pad.
Claim 15
Dependent Claim
22 words
An instrument according to any one of claims 10-14 in which the cup retainer includes, at its forward end a cup-retaining flange.
Claim 16
Dependent Claim
16 words
An instrument according to claim 15 in which the flange includes at least one cup-engaging pin.
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