Proximally self-locking long bone prosthesis
US8398790B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 17, 2012 |
| Grant date | Mar 19, 2013 |
| Priority date | — |
| Expiry date | Jan 17, 2032 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61F2310/0097
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A femoral stem hip implant for insertion into a surgically created aperture in a femur includes a monolithic femoral stem made of shape memory material. The stem is configured to be inserted into the aperture, has a proximal portion and a longitudinal axis. The shape memory material within the proximal portion has a cross-section perpendicular to the longitudinal axis. At least a portion of the shape memory material within the proximal portion is in a compressed state by application of a plurality of compressive forces at a temperature below an austenitic finish temperature of the shape memory material so that the cross-section expands through shape memory effect via the formation of austenite in response to a temperature increase after insertion into the aperture thereby causing a locking-force to be exerted against an inner surface of the aperture, the locking force being sufficient to stabilize the implant in the aperture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.