Hip joint device and method
A medical device for implantation in a hip joint of a patient is provided. The medical device comprises a first and second piece and a releasing member adapted to, in a first state hold the first piece attached to the second piece, and in a second state release the first piece from the second piece. The releasing member is adapted to change from the first state to the second state when a pre-determined strain is placed on the releasing member.
1. A medical device for reducing the risk of permanent damage to at least one of; the femoral bone, the pelvic bone, components of a prosthetic hip joint, and a fixation between a prosthetic hip joint and at least one of the femoral bone and the pelvic bone, wherein said medical device comprises a first and second piece, wherein said first piece is a ball shaped piece, adapted to replace at least the surface of the caput femur of the hip joint, and wherein said second piece is a bowl shaped piece, adapted to replace the acetabulum of the hip joint, wherein said medical device further comprising a releasing member adapted to, in a first state hold said first piece attached to said second piece, and in a second state release said first piece from said second piece, and wherein said releasing member is adapted to change from said first state to said second state when a pre-determined strain is placed on said releasing member, and wherein said releasing member further comprises an adjustable calibration screw for adjusting and thereby calibrating the pre-determined strain required for said releasing, member to change from said first state to said second state.
2. The medical device according to claim 1 , wherein said releasing member is adapted to non-invasively change front said first state to said second state and from said second state to said first state, when a pre-determined strain is placed on said releasing member.
3. The medical device according to claim 1 , wherein said releasing member comprises an elastic portion.
4. The medical device according to claim 3 , wherein said elastic portion comprises an elastic material.
5. The medical device according to claim 1 , wherein said releasing member comprises a movable part.
6. The medical device according to claim 3 , wherein said elastic portion comprises a spring.
7. The medical device according to claim 1 , wherein said releasing member comprises an elastic portion and/or a bendable portion and/or a flexible portion and/or a compressible portion.
8. The medical device according to claim 1 , wherein said ball shaped piece is adapted to be fixated in said bowl shaped piece using said releasing member.
9. The medical device according to claim 1 , wherein said releasing member comprises multiple holding members.
10. The medical device according to claim 9 , wherein said multiple holding members are adapted to at least one of:
slide against said first piece, and
roll against said first piece.
11. The medical device according to claim 1 , wherein, said howl shaped piece of said medical device comprises said releasing member.
12. The medical device according to claim 1 , wherein said releasing member comprises a movable portion.
13. The medical device according to claim 12 , wherein the releasing member comprises a movable part.