Extraction device
OwnerBruno Hiernard, Richard Farrarinventors
Life of this patent
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Abstract
An extraction device (10,110) for removing a socket bearing insert (12) from an acetabular cup (14) in an acetabular prosthesis in which an extracting member (30, 130) is adapted for attachment to a groove (20) in the insert (12). The extraction device (10, 110) includes a support in the form of a sleeve (38, 138) which bears against the rim of the acetabular cup (14). The extraction device (10, 110) has means for providing an axial force exclusively between the extracting member (30, 130) and the support such that no force is transmitted to a bone to which the acetabular cup (14) is attached.
Claims10
An extraction device for removing an insert from an acetabular cup comprising:
- an extracting member with attachment means for attachment, in use, to the insert to be removed;
- a support adapted for bearing, in use, against the cup portion;
- and
- means for providing an axial force exclusively between the extracting member and the support such that no force is transmitted to any bone to which the cup portion is attached;
- wherein the support is in the form of an outer sleeve one end of which bears against the cup portion during the extraction operation;
- wherein a cut away portion extends through the outer sleeve to allow access within the outer sleeve and to enable visual inspection by the surgeon.
An extraction device for removing an insert from an acetabular cup comprising:
- an extracting member with attachment means for attachment, in use, to the insert to be removed;
- a support adapted for bearing, in use, against the cup portion;
- and
- means for providing an axial force exclusively between the extracting member and the support such that no force is transmitted to any bone to which the cup portion is attached;
- wherein the extracting device is magnetized.
An extraction device for removing an insert from an acetabular cup comprising:
- an extracting member with attachment means for attachment, in use, to the insert to be removed;
- a support adapted for bearing, in use, against the cup portion;
- and
- means for providing an axial force exclusively between the extracting member and the support such that no force is transmitted to any bone to which the cup portion is attached;
- wherein the attachment means of the extracting member is in the form of a lip for attachment means to the insert such that the axial force is transmitted to the insert.
An extraction device for removing an insert from an acetabular cup comprising:
- an extracting member with attachment means for attachment, in use, to the insert to be removed;
- a support adapted for bearing, in use, against the cup portion;
- and
- means for providing an axial force exclusively between the extracting member and the support such that no force is transmitted to any bone to which the cup portion is attached;
- wherein the attachment means of the extracting member is in the form of at least one extracting member which is moveable to allow the location of the attachment means on the insert;
- and
- wherein said at least one extracting member is biased such that at least one extracting member disengages the insert when the sleeve is not located over the extracting member.
An extraction device for removing an insert from an acetabular cup comprising:
- an extracting member with attachment means for attachment, in use, to the insert to be removed;
- a support adapted for bearing, in use, against the cup portion;
- and
- means for providing an axial force exclusively between the extracting member and the support such that no force is transmitted to any bone to which the cup portion is attached;
- wherein the extracting member is in the form of an arc of a cylinder, the arc no greater than 180 degrees such that the extracting member can be slidably located on the insert.
An extraction device for removing an insert from an acetabular cup comprising:
- an extracting member with attachment means for attachment, in use, to the insert to be removed;
- a support adapted for bearing, in use, against the cup portion;
- and
- means for providing an axial force exclusively between the extracting member and the support such that no force is transmitted to any bone to which the cup portion is attached;
- wherein the extracting member is in the form of a plurality of arms which are either moveable outwardly from the insert or rotatable about a pivot point such that the attachment means can be located or removed from the insert.
Dependencies are inferred from the claim text.