摘要 |
A medical device for implantation in a hip joint of a patient is provided. The medical device is adapted to be fixated to the pelvic bone of the patient. The medical device comprises an inner and an outer surface, a contacting portion of the inner surface is spherical and adapted to face the center of the hip joint when said medical device is implanted, and said medical device is adapted to receive a caput femur or a prosthetic caput femur having a spherical portion. The medical device comprises at least one extending portion adapted to clasp the caput femur, or prosthetic caput femur, for restraining said caput femur, or prosthetic caput femur in said medical device. The medical device is adapted to release the caput femur or prosthetic caput femur from the medical device when a predetermined strain is placed on the medical device. The ability of the medical device to release the caput femur or prosthetic caput femur from the medical device when a predetermined strain is placed on the medical device reduces the risk that the prosthesis is loosened by an abnormal strain being placed on the hip joint from e.g. the patient falling or making a rapid movement of the hip. |
主权项 |
1. A medical device for implantation in a hip joint of a patient, wherein said medical device is adapted to be fixated to the pelvic bone of the patient, and wherein said medical device comprises an inner and an outer surface, the inner surface comprises an equator line, being the largest circular circumference of said inner surface, wherein a contacting portion of said inner surface is spherical and adapted to face the center of the hip joint when said medical device is implanted, and wherein said medical device is adapted to receive a caput femur or a prosthetic caput femur having a spherical portion, wherein
a) said medical device comprises at least one extending portion extending beyond said circular equator line and being adapted to clasp the caput femur, or prosthetic caput femur, for restraining said caput femur, or prosthetic caput femur in said medical device, b) said medical device is adapted to release the caput femur or prosthetic caput femur from said medical device when a predetermined strain is placed on said medical device, and c) wherein said at least one extending portion adapted to clasp the caput femur comprises an elastic portion comprising an elastic band adapted to at least partly encircle the caput femur. |