US 10,667,917 B2Granted

Acetabular joint prosthesis

OwnerDaniel F. Justin, George J. Haidukewych +1inventors

InventorsDaniel F. Justin, George J. Haidukewych, James Q. Spitler

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Abstract

An acetabular joint prosthesis may be designed to replace an acetabular articular surface. The prosthesis can include an acetabular cup, an augment, and an augment-securing mechanism configured to secure the augment to the cup. The mechanism can be reconfigured between an unlocked configuration in which a slider is slidable along a guide feature and a locked configuration in which the slider or guide feature is in an expanded form such that the slider is fixed in place relative to the guide feature. An unlocked configuration may include the augment-securing mechanism allowing rotation between the augment and the cup, with the augment being securable to the augment in multiple rotational positions. Also, the prosthesis may be configured to facilitate actuation between the unlocked and locked configurations, including moving an instrument to the prosthesis in an access direction that is substantially perpendicular to a rim of the cup.

Claims20

Dependent claims

An acetabular joint prosthesis for replacing a natural acetabular articular surface on a pelvis, the acetabular joint prosthesis comprising:

a prosthetic acetabular cup comprising:
a cup bone-facing surface having a generally convex shape;
and
a cup joint-facing surface having a generally concave shape defining a rim proximate a plane;
an augment comprising:
an augment cup-facing surface that is securable to the cup bone-facing surface;
and
an augment bone-facing surface that, with the augment cup-facing surface secured to the cup bone-facing surface, is configured to face a portion of a pelvis to which the prosthetic acetabular cup is attached;
and
an augment-securing mechanism configured to secure the augment to the prosthetic acetabular cup, the augment-securing mechanism comprising:
a guide feature extending along one of the cup bone-facing surface and the augment cup-facing surface;
a slider on the other of the cup bone-facing surface and the augment cup-facing surface that engages the guide feature;
and
a securing element;
wherein the augment-securing mechanism is reconfigurable between:
an unlocked configuration, in which the slider is slidable along the guide feature;
and
a locked configuration in which the slider and the guide feature are frictionally engaged such that the slider is fixed in place relative to the guide feature;
wherein the augment-securing mechanism is reconfigurable by:
engaging the securing element of the augment-securing mechanism with an instrument by moving the instrument toward the prosthetic acetabular cup in an access direction generally perpendicular to the plane;
with the instrument engaging the securing element, actuating the instrument to move the augment-securing mechanism to the locked configuration;
and
with the augment-securing mechanism in the locked configuration, withdrawing the instrument.

20 more elements

An acetabular joint prosthesis for replacing a natural acetabular articular surface on a pelvis, the acetabular joint prosthesis comprising:

a prosthetic acetabular cup comprising:
a cup bone-facing surface having a generally convex shape;
and
a cup joint-facing surface having a generally concave shape;
and
an augment comprising:
an augment cup-facing surface that is securable to the cup bone-facing surface;
and
an augment bone-facing surface;
and
an augment-securing mechanism configured to secure the augment to the prosthetic acetabular cup with at least a portion of the cup bone-facing surface facing at least a portion of the augment cup-facing surface, the augment-securing mechanism comprising a pair of members that are rotatable relative to each other, and the augment-securing mechanism being reconfigurable between:
an unlocked configuration, in which the augment is rotatable about an axis between multiple rotational positions relative to the prosthetic acetabular cup, wherein in each of the rotational positions, with the augment cup-facing surface secured to the cup bone-facing surface, the augment bone-facing surface is configured to face a portion of a pelvis to which the prosthetic acetabular cup is attached;
and
a locked configuration in which the augment is fixed in place in one of the rotational positions, wherein the augment-securing mechanism is reconfigurable into the locked configuration with the augment in any of the multiple rotational positions.

11 more elements

An acetabular joint prosthesis for replacing a natural acetabular articular surface on a pelvis, the acetabular joint prosthesis comprising:

a prosthetic acetabular cup comprising:
a cup bone-facing surface having a generally convex shape;
and
a cup joint-facing surface having a generally concave shape defining a rim proximate a plane;
an augment comprising:
an augment cup-facing surface that is securable to the cup bone-facing surface;
and
an augment bone-facing surface that, with the augment cup-facing surface secured to the cup bone-facing surface, is configured to face a portion of a pelvis to which the prosthetic acetabular cup is attached;
and
an augment-securing mechanism configured to secure the augment to the prosthetic acetabular cup, the augment-securing mechanism comprising:
a guide feature extending along one of the cup bone-facing surface and the augment cup-facing surface;
a slider on the other of the cup bone-facing surface and the augment cup-facing surface that engages the guide feature;
and
a fastener that can be actuated to reconfigure the augment-securing mechanism between:
an unlocked configuration, in which the slider is slidable along the guide feature;
and
a locked configuration in which the slider and the guide feature are frictionally engaged such that the slider is fixed in place relative to the guide feature;
wherein the fastener is oriented such that, with the cup bone-facing surface secured to the pelvis, the fastener can be engaged and actuated by an instrument from along an access direction generally perpendicular to the plane.

15 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/886,711Filed 1 Feb 2018
Published: US 2019/0231539 A11 Aug 2019
Granted: 2 Jun 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

A61F 2/34
For the hip: acetabular cups
A61F 2/30734
Accessories: modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
A61F 2002/30131
Rounded shapes, e.g. with rounded corners: horseshoe- or crescent- or C-shaped or U-shaped
A61F 2002/30158
Convex polygonal shapes: trapezoidal