Intramedullary nail
View Patent ↗The invention relates to an intramedullary nail used for treating fractures of the femur. It comprises a distal end, which is appointed for insertion into the marrow cavity channel, a proximal end, and a longitudinal axis. A first bore is located adjacent the proximal end and extends through the proximal end and transversely intersects the longitudinal axis, and serves to accommodate a femoral head screw. The center axis of the first bore forms an angle with the longitudinal axis that ranges from 110° to 150°. A second bore is located between the first bore and the proximal end and extends through the proximal end and transversely intersects the longitudinal axis, and serves to accommodate a hip pin. The second bore is at least partially shaped as an oblong hole or slot with a width B and a length L>B, and the length L of the oblong hole extends in the direction of the longitudinal axis.
1. A fixation system for the treatment of femoral fractures, comprising an intramedullary nail, a femoral-head screw and a hip pin, wherein
the intramedullary nail includes a distal end for insertion in the medullary channel, a proximal end, a longitudinal axis and, a first borehole located closer to the proximal end that intersects the longitudinal axis and is configured to accept the femoral-head screw, and the first borehole defining a center line extending at an angle α of 30° to 70° relative to the longitudinal axis; and
the intramedullary nail includes a second borehole provided between the first borehole and the proximal end that intersects the longitudinal axis and is configured to accept the hip pin and is at least in part elongated into a slot with a width B and a length L>B, said length L of the slot extending in the direction of the longitudinal axis.
2. The fixation system of claim 1 , wherein the first borehole is cylindrically round.
3. The fixation system of claim 1 , wherein the second borehole defines a lateral entry opening that is cylindrically round and a medial exit opening that is elongated into a slot.
4. The fixation system of claim 3 , wherein both the lateral entry opening and the medial exit opening of the second borehole are elongated into a slot.
5. The fixation system of claim 3 , wherein the lateral entry opening of the second borehole is elongated into a slot while the medial exit opening of the second borehole is cylindrically round.
6. The fixation system of claim 1 , wherein the first borehole has a diameter D and the width B of the second borehole is smaller than D.
7. The fixation system of claim 1 , wherein the second borehole defines a center line that extends at an angle of between about 30° to 70° relative to the longitudinal axis.
8. The fixation system of claim 7 , wherein the center line extends at an angle of between about 70° to 90° relative to the longitudinal axis.
9. The fixation system of claim 1 , wherein the length L is between about 8 to 12 mm.
10. The fixation system of claim 1 , wherein the width B is between about 5 to 10 mm.
11. The fixation system of claim 1 , wherein the intramedullary nail further comprises a third borehole located closer to the distal end that horizontally intersects the longitudinal axis and is configured to accept a distal locking screw.
12. The fixation system of claim 1 , wherein the first borehole defines a center line that extends at an angle of between about 40° to 55° relative to the longitudinal axis.
13. The fixation system of claim 1 , wherein the ratio of L:B is in the range of about 1.05 to 2.00.
14. The fixation system of one of claim 1 , wherein the hip pin has a length between about 5 to 20 mm and preferably 10 to 15 mm shorter than the femoral-head screw.
15. The fixation system of claim 14 , wherein the diameter of the hip pin corresponds to the width B of the second borehole.
16. An intramedullary nail for the treatment of femoral fractures, comprising
a distal end for insertion in the medullary channel;
a proximal end;
a longitudinal axis;
a first borehole located closer to the proximal end extending through the proximal end and intersecting the longitudinal axis and configured to accept a femoral head screw, the first borehole defining a center line extending at an angle of between about 30° to 70° relative to the longitudinal axis; and
a second borehole positioned between the first borehole and the proximal end extending through the proximal end and intersecting the longitudinal axis and configured to accept a hip pin,
wherein the second borehole is at least in part elongated into a slot having a width B and a length L>B, with the length L of the slot extending in the direction of the longitudinal axis; and
the second borehole defines a lateral entry opening that is cylindrically round and a medial exit opening that is elongated into a slot.
17. The nail of claim 16 , wherein the first borehole is cylindrically round.
18. The nail of claim 17 , wherein the second borehole defines a center line that extends at an angle of between about 30° and 70° relative to the longitudinal axis.
19. An intramedullary nail for the treatment of femoral fractures, comprising
a distal end for insertion in the medullary channel;
a proximal end;
a longitudinal axis;
a first borehole located closer to the proximal end extending through the proximal end and intersecting the longitudinal axis and configured to accept a femoral head screw, the first borehole defining a center line extending at an angle of between about 30° to 70° relative to the longitudinal axis; and
a second borehole positioned between the first borehole and the proximal end extending through the proximal end and intersecting the longitudinal axis and configured to accept a hip pin,
wherein the second borehole is at least in part elongated into a slot having a width B and a length L>B, with the length L of the slot extending in the direction of the longitudinal axis; and
the second borehole defines a lateral entry opening that is elongated into a slot and a medial exit opening that is cylindrically round.