Hip joint device and method

Abstract

A medical device for implantation in a hip joint of a patient, the natural hip joint having a ball shaped caput femur integrated with a collum femur having a collum and caput center axis, extending longitudinal along the collum and caput femur, in the center thereof, as the proximal part of the femoral bone with a convex hip joint surface towards the centre of the hip joint and a bowl shaped acetabulum as part of the pelvic bone with a concave hip joint surface towards the centre of the hip joint, the medical device comprising; an artificial caput femur comprising a convex surface towards the centre of the hip joint, an elongated portion adapted to be connected to a prosthetic spherical portion of said artificial convex caput femur and fixated to the pelvic bone of the human patient.

1 . A medical device for implantation in a hip joint of a patient, the natural hip joint having a ball shaped caput femur integrated with a collum femur having a collum and caput center axis, extending longitudinal along the collum and caput femur, in the center thereof, as the proximal part of the femoral bone with a convex hip joint surface towards the centre of the hip joint and a bowl shaped acetabulum as part of the pelvic bone with a concave hip joint surface towards the centre of the hip joint, the medical device comprising; an artificial caput femur comprising a convex surface towards the centre of the hip joint, an elongated portion adapted to be connected to a prosthetic spherical portion of said artificial convex caput femur and fixated to the pelvic bone of the human patient, wherein said artificial convex caput femur is adapted to, when implanted:
 a. be fixated to the pelvic bone of the human patient through said elongated portion fixation to the pelvic bone, and   b. be in movable connection with a prosthetic artificial acetabulum surface fixated to the femoral bone of the patient, comprising at least one extending portion adapted to clasp said prosthetic spherical portion, wherein   c. said elongated portion comprises a restricting portion adapted to restrict the motion range of the artificial acetabulum in relation to said artificial convex caput femur, and wherein   d. said restricting portion of said elongated portion is adapted to enable an advantageous motion range in relation to said artificial acetabulum.   
     
     
         2 . The medical device according to  claim 1 , wherein said elongated portion comprises at least one recess adapted to receive a portion of said prosthetic artificial acetabulum, when implanted. 
     
     
         3 . The medical device according to  claim 2 , wherein said recess is adapted to be placed frontal to the coronal pelvis plane, when implanted. 
     
     
         4 . The medical device according to  claim 2 , wherein said recess is adapted to be placed in the frontal quadrant, when implanted. 
     
     
         5 . The medical device according to  claim 2 , wherein said recess is adapted to be placed in the dorsal quadrant, when implanted. 
     
     
         6 . The medical device according to  claim 2 , wherein said recess is adapted to be placed in the proximal quadrant, when implanted. 
     
     
         7 . The medical device according to  claim 2 , wherein said recess is adapted to be placed in the distal quadrant, when implanted. 
     
     
         8 . The medical device according to  claim 2 , wherein said recess is more than 2 mm deep. 
     
     
         9 . The medical device according to  claim 2 , wherein said recess is more than 4 mm deep. 
     
     
         10 . The medical device according to  claim 2 , wherein said recess is more than 6 mm deep. 
     
     
         11 . The medical device according to  claim 2 , wherein said recess is more than 8 mm deep. 
     
     
         12 . The medical device according to  claim 1 , wherein said elongated portion comprises an adaptation adapted to receive said extending portion when implanted. 
     
     
         13 . The medical device according to  claim 12 , wherein said adaptation comprises a bent portion of said elongated portion. 
     
     
         14 . The medical device according to  claim 13 , wherein said bent portion is bent such that said restricting portion of said elongated portion mainly is placed frontal to the coronal pelvis plane, when implanted. 
     
     
         15 . The medical device according to  claim 13 , wherein said bent portion is bent such that said restricting portion of said elongated portion mainly is placed dorsal to the coronal pelvis plane, when implanted. 
     
     
         16 . The medical device according to  claim 13 , wherein said bent portion is bent such that said restricting portion of said elongated portion mainly is placed in the frontal quadrant, when implanted. 
     
     
         17 . The medical device according to  claim 13 , wherein said bent portion is bent such that said restricting portion of said elongated portion mainly is placed in the dorsal quadrant, when implanted. 
     
     
         18 . The medical device according to  claim 13 , wherein said bent portion is bent such that said restricting portion of said elongated portion mainly is placed in the proximal quadrant, when implanted. 
     
     
         19 . The medical device according to  claim 13 , wherein said bent portion is bent such that said restricting portion of said elongated portion mainly is placed in the distal quadrant, when implanted. 
     
     
         20 . The medical device according to  claim 1 , wherein a cross-section of said restricting portion of said elongated portion, perpendicular to the caput and collum center axis, comprises a first distance and a second distance, wherein a center point of a line of said first distance intersects a center point of a line of said second distance, and wherein said first distance is shorter than said second distance. 
     
     
         21 .- 70 . (canceled)