Device for shortening an elongated bone
The invention relates to a device ( 1 ) for shortening an elongated bone, in particular an ulna, comprising a bone plate ( 5 ) to be attached to the bone with a hole ( 6 ) for a fastening element for fixing the bone plate ( 5 ) on the bone and a slot offset longitudinally thereto for a holding element ( 9 ) that can be fastened in the bone, so that after the bone has been severed and a piece of bone has been removed in the region between the hole ( 6 ) and the slot, bone parts can be guided together by the displacement of the bone plate relative to the holding element ( 9 ). In order to create a device ( 1 ), which is constructed with a small space requirement and permits a highly accurate guiding together of the bone parts, it is provided according to the invention that a block ( 12 ) with an opening ( 13 ) for the holding element ( 9 ), which opening is elongated in plan view and lies above the slot, is arranged on the bone plate ( 5 ) in the region of the slot, wherein a unit ( 14 ) is arranged in the opening ( 13 ), against which unit the holding element ( 9 ) rests in the displacement direction and relative to which a remaining part of the block ( 12 ) can be displaced with the aid of a provided adjustment element ( 15 ).
1. Device for shortening an elongated bone, comprising a bone plate to be attached to the bone with a hole for a fastening element for fixing the bone plate on the bone and a slot offset longitudinally from the hole for a holding element that can be fastened in the bone, so that after the bone has been severed to form bone parts and a piece of bone has been removed in the region between the hole and the slot, remaining bone parts can be guided together by the displacement of the bone plate relative to the holding element, wherein a block with an opening for the holding element, which opening is elongated in plan view and lies above the slot, is arranged on the bone plate in the region of the slot, wherein a unit is arranged in the opening, against which unit the holding element rests in the displacement direction and relative to which a remaining part of the block can be displaced with the aid of a provided adjustment element.
2. Device according to claim 1 , wherein the bone plate is embodied in an elongated manner.
3. Device according to claim 1 , wherein the block is embodied with extensions on the base which define a further plate, which is embodied at least in part with approximately the same width as the bone plate, but shorter.
4. Device according to claim 3 , wherein the bone plate and the further plate respectively have a slot, which slots are arranged one above the other and are located at an end of the bone plate lying opposite the hole.
5. Device for shortening an elongated bone, comprising a bone plate to be attached to the bone with a hole for a fastening element for fixing the bone plate on the bone and a slot offset longitudinally from the hole for a holding element that can be fastened in the bone, so that after the bone has been severed to form bone parts, and a piece of bone has been removed in the region between the hole and the slot, remaining bone parts can be guided together by the displacement of the bone plate relative to the holding element,
wherein a block with an opening for the holding element, which opening is elongated in plan view and lies above the slot, is arranged on the bone plate in the region of the slot, wherein a unit is arranged in the opening, against which unit the holding element rests in the displacement direction and relative to which a remaining part of the block can be displaced with the aid of a provided adjustment element,
wherein the block is embodied with extensions on the base which define a further plate, which is embodied at least in part with approximately the same width as the bone plate, but shorter,
wherein the bone plate and the further plate respectively have a slot, which slots are arranged one above the other and are located at an end of the bone plate lying opposite the hole, and
wherein the holding element and a further holding element are provided, which engage in the slot and the opening of the block or the slots and are formed in an elongated manner with a cylindrical part and a part having a thread, wherein the cylindrical part in the block bears against the unit or against the further plate.
6. Device according to claim 3 , wherein the further plate is attached to the bone plate in a detachable manner.
7. Device according to claim 3 , wherein a guide device for a cutting device is detachably fastened to the further plate.
8. Device according to claim 7 , wherein the guide device can be fixed in a variable manner relative to the further plate.
9. Device according to claim 7 , wherein the guide device has a guide slot and a scale, on which a position of the guide device relative to the further plate can be read off.
10. Device according to claim 6 , wherein the guide device is detachably fastened to the further plate.
11. Device according to claim 1 , wherein the remaining part of the block can be displaced continuously by the adjustment element.
12. Device according to claim 1 , wherein the unit partially surrounds the holding element.
13. Device according to claim 1 , wherein the adjustment element is embodied as an adjustment screw, which is arranged in or on the remaining part of the block, and is connected to the unit.
14. Device according to claim 13 , wherein the adjustment screw runs approximately parallel to the bone plate in the displacement direction.
15. Device according to claim 1 , wherein the unit can be placed into the opening and the block has lateral recesses running in the displacement direction, through which a holder connected to the adjustment element and holding the unit vertically in position is guided.
16. Device according to claim 5 , wherein the slots of the bone plate and a free region of the opening into which the holding element is guided or the slot of the further plate are embodied with approximately the same dimensions.
17. Device for shortening the elongated bone according to claim 1 , wherein the elongated bone is an ulna.