Hip joint device and method
View Patent ↗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 implantation in a hip joint of a patient, said medical device comprising:
a. a first piece, wherein
i. said first piece is adapted to be fixated to the pelvic bone, and
ii. said first piece comprises a convex contacting surface adapted to be partially placed inside a concave contacting surface,
b. a second piece, wherein
i. said second piece is adapted to be fixated to the femoral bone, and
ii. said second piece comprises a concave contacting surface adapted to partially surround said convex contacting surface of said first piece, when implanted, and
c. a releasing member adapted to, when implanted, 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 predetermined strain is placed on said releasing member by the connection with the first or second piece, when implanted, and wherein said medical device comprises a calibration member for 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 first piece comprises a ball shaped piece and said second piece comprises a bowl shaped piece, and wherein said ball shaped piece is adapted to be placed in said bowl shaped piece to replace a functioning hip joint.
3. The medical device according to claim 2 , wherein said ball shaped piece is adapted to be fixated in said bowl shaped piece using said releasing member.
4. The medical device according to claim 2 , wherein said releasing member comprises an elastic band adapted to at least partly encircle said ball shaped piece.
5. The medical device according to claim 1 , wherein said releasing member is adapted to change from said first state to said second state and from said second state to said first state without requiring any invasive steps, when a predetermined strain is placed on said releasing member.
6. The medical device according to claim 1 , wherein at least one of said first and second pieces comprises at least two parts adapted to be in contact with each other when the medical device is implanted in the patient.
7. The medical device according to claim 1 , wherein said second piece of said medical device comprises said releasing member.
8. The medical device according to claim 1 , wherein said releasing member comprises at least one of;
a bendable portion,
a flexible portion,
a compressible portion,
a movable portion,
a movable part,
an elastic material,
a spring,
an elastic band,
a magnet adapted to hold said first piece to said second piece, and
a rupture device adapted to fail at a pre-determined strain.
9. The medical device according to claim 1 , wherein said releasing member comprises multiple holding members.
10. The medical device according to claim 1 , wherein said first piece comprises a first area and a second area, and wherein said first area, comprises a first material adapted to be elastic and said second area comprises a second material adapted to be elastic, and wherein said first material is adapted to be more elastic than said second material.
11. The medical device according to claim 1 , wherein said calibration member is a calibration screw.
12. A medical device for implantation in a hip joint of a patient, said medical device comprising:
a. a first piece, wherein
i. said first piece is adapted to be fixated to the pelvic bone, and
ii. said first piece comprises a convex contacting surface adapted to be partially placed inside a concave contacting surface,
b. a second piece, wherein
i. said second piece is adapted to be fixated to the femoral bone,
and
ii. said second piece comprises a concave contacting surface adapted to partially surround said convex contacting surface of said first piece, when implanted, and
c. a releasing member adapted to, when implanted, 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 predetermined strain is placed on said releasing member by the connection with the first or second piece, when implanted, and wherein said first piece comprises a first area and a second area, and wherein said first area comprises a first material adapted to be elastic and said second area comprises a second material adapted to be elastic, and wherein said first material is adapted to be more elastic than said second material.
13. The medical device according to claim 12 , wherein said releasing member comprises multiple holding members.
14. The medical device according to claim 12 , wherein said releasing member comprises at least one of;
a bendable portion,
a flexible portion,
a compressible portion,
a movable portion,
a movable part,
an elastic material,
a spring,
an elastic band,
a magnet adapted to hold said first piece to said second piece, and
a rupture device adapted to fail at a pre-determined strain.
15. The medical device according to claim 12 , wherein said releasing member comprises an elastic band adapted to at least partly encircle said ball shaped piece.
16. The medical device according to claim 12 , wherein said second piece of said medical device comprises said releasing member.
17. The medical device according to claim 12 , wherein said first piece comprises a ball shaped piece and said second piece comprises a bowl shaped piece, and wherein said ball shaped piece is adapted to be placed in said bowl shaped piece to replace a functioning hip joint.
18. The medical device according to claim 17 , wherein said ball shaped piece is adapted to be fixated in said bowl shaped piece using said releasing member.
19. The medical device according to claim 12 , wherein said releasing member is adapted to change from said first state to said second state and from said second state to said first state without requiring any invasive steps, when a predetermined strain is placed on said releasing member.
20. The medical device according to claim 12 , wherein at least one of said first and second pieces comprises at least two parts adapted to be in contact with each other when the medical device is implanted in the patient.