Offset adapter unit
AssigneeCorentec Co., Ltd.
InventorsDoo-Hun Sun, Goon-Hee Lee, Oui-Sik Yoo, Jung-Woo Seo, Yeo-Kyung Kang
Life of this patent
Estimating the term…
Abstract
The present invention relates to an implant playing a role as a joint in coupling a revision implant in revision total knee arthroplasty and, more specifically, to an offset adapter unit comprising an adapter which couples a femoral member or a tibial member to a stem member in revision total knee arthroplasty; and a nut coupled to the adapter, thereby improving the strength by considering fracture occurring in the narrowest area.
Claims8
An offset adapter unit for use in coupling a femoral member or a tibial member to a stem member in a total knee arthroplasty revision, the offset adapter unit comprising:
- an adapter comprising:
- a head, comprising:
- a female screw groove extending at least partially into the head through a top surface of the head;
- and
- a lower surface having a first diameter;
- a body extending from the head, the body and the head being a single, integral, unitary, and monolithic structure, the body comprising:
- an upper expanded portion extending from the lower surface of the head, the upper expanded portion having a second diameter that is less than the first diameter;
- and
- a lower screw portion extending monolithically from a lower surface of the upper expanded portion, the lower screw portion having a third diameter that is less than the second diameter and wherein the lower screw portion is threaded;
- and
- a nut, comprising:
- a lower female screw portion having an inside surface that directly engages the threads of the lower screw portion of the body during use;
- and
- an upper step portion having an inside surface that contacts the upper expanded portion of the body during use, the upper step portion extending from the lower female screw portion, the upper step portion and the lower female screw portion being a single, integral, unitary, and monolithic structure.
An arthroplasty revision offset adapter unit, the offset adapter unit comprising:
- an adapter comprising:
- a head comprising a lower surface having a first diameter;
- a body extending monolithically from the head, comprising:
- an upper expanded portion extending from the lower surface of the head, the upper expanded portion having a second diameter;
- and
- a lower screw portion extending monolithically from a lower surface of the upper expanded portion, the lower screw portion having a third diameter that is less than the second diameter;
- and
- a nut, comprising:
- a lower female screw portion that directly engages the lower screw portion of the body;
- and
- an upper step portion having an inside surface that at least partially surrounds and contacts the upper expanded portion of the body, the upper step portion extending monolithically from the lower female screw portion.
An arthroplasty revision offset adapter unit, the offset adapter unit comprising:
- an adapter comprising:
- a head, comprising:
- a female-threaded screw groove extending at least partially into the head through a top surface of the head;
- and
- a lower surface having a first diameter;
- a body extending from the head, the body comprising:
- an upper expanded portion extending from the lower surface of the head, the upper expanded portion having a lower portion having a second diameter;
- and
- a lower screw portion extending from the lower portion of the upper expanded portion, the lower screw portion having a third diameter that is less than the second diameter;
- and
- a nut, comprising:
- a lower female screw portion that directly engages the lower screw portion of the body;
- and
- an upper step portion having an inside surface that at least partially surrounds and contacts the upper expanded portion of the body
- wherein the female-threaded screw groove has a first central axis that is parallel to and offset from a second central axis of the lower screw portion of the body.
Dependencies are inferred from the claim text.