Patent ID: 8282649

Claim:
An instrument for use in removal of a prosthetic implant having a hollow generally hemispherical portion having a peripheral rim, the implant for use performing arthroplasty, the instrument comprising: a body; a first member connected to the body, the first member including a contact portion for engagement with the rim of the implant at a first position; a second member connected to the body, the second member being moveable with respect to the first member, the second member including a contact portion for engagement with the implant at a second position, spaced from the first position; and an urging member for urging the contact portion of the first member toward the contact portion of the second member and for urging the contact portion of the first member away from the contact portion of the second member; wherein the urging member includes a first linking member pivotally coupled to the body and the first member, a second linking member pivotally coupled to the body and the second member, a third linking member coupled to the first and second linking members, and a shaft having a longitudinal axis and coupled to the third linking member, such that as the shaft is moved along the longitudinal axis, the first and second linking members pivot relative to the body, thereby causing the first and second members to pivot relative to the body; wherein the contact portion of the first member have an inner contact surface and an outer contact surface defined by an included angle of between about 5 and about 45 degrees.