Device comprising a plate and screws for fastening a plate to a bone
First Claim
1. A device connectable with a bone, comprising a plate with at least two clearance holes;
- retaining means for retaining the plate on a bone and including sleeves each having a clamping part extending through the clearance hole and provided with slots and an inner contact surface and an outer surface, and a collar made of one piece with the clamping part and protruding beyond the outer surface of the latter so as to bear against the side of the plate facing away of the bone; and
screws for fastening the plate to the bone and each having an axis, a threaded portion to be screwed into the bone, and an expander displaceable relative to the clamping part in an axial direction and having an outer contact surface in contact with the contact surface of the clamping part and coaxial with the screw axis in at least one position of the screw, in which position at least one of the said two contact surfaces converges in the direction of the screw axis, in such a way, that by displacing the expander, the clamping part may be clamped tight within the clearance hole.
2 Assignments
0 Petitions
Accused Products
Abstract
A plate bearing against a bone has a number of clearance holes with sleeves. Openings provided in the sleeves include each a section diverging away from the bone and bounded by a conical surface. The sleeves are subdivided into tongues by means of slots cut into the free face of the collar. A screw is screwed into the bone at every clearance hole, the head of the screw being bounded by a conical or convex surface. By tightening the screw the tongues are forced apart by the head of the screw, thus clamping the sleeve in relation to the plate. This provides a guarantee, that the plate will stay rigidly connected with the screws, even if a reabsorption of bone takes place. Some of the sleeves comprise clamping parts excentric in relation to the screw axes, enabling the surgeon to press the bone pieces against each other.
-
Citations
15 Claims
-
1. A device connectable with a bone, comprising a plate with at least two clearance holes;
- retaining means for retaining the plate on a bone and including sleeves each having a clamping part extending through the clearance hole and provided with slots and an inner contact surface and an outer surface, and a collar made of one piece with the clamping part and protruding beyond the outer surface of the latter so as to bear against the side of the plate facing away of the bone; and
screws for fastening the plate to the bone and each having an axis, a threaded portion to be screwed into the bone, and an expander displaceable relative to the clamping part in an axial direction and having an outer contact surface in contact with the contact surface of the clamping part and coaxial with the screw axis in at least one position of the screw, in which position at least one of the said two contact surfaces converges in the direction of the screw axis, in such a way, that by displacing the expander, the clamping part may be clamped tight within the clearance hole.
- retaining means for retaining the plate on a bone and including sleeves each having a clamping part extending through the clearance hole and provided with slots and an inner contact surface and an outer surface, and a collar made of one piece with the clamping part and protruding beyond the outer surface of the latter so as to bear against the side of the plate facing away of the bone; and
-
2. A device connectable with a bone, comprising a plate with at least two clearance holes;
- retaining means for retaining the plate on a bone and including sleeves each having a clamping part extending through the clearance hole and provided with slots and an inner contact surface and an outer surface which bears at least in part against the surface bounding the clearance hole, the outer surface of the clamping part of at least one of said sleeves being disposed eccentric in relation to the screw axis; and
screws for fastening the plate to the bone and each having an axis, a threaded portion to be screwed into the bone, and an expander displaceable relative to the clamping part in an axial direction and having a contact surface in contact with the contact surface of the clamping part and coaxial with the screw axis in at least one position of the screw, in which position at least one of the said two contact surfaces converges in the direction of the screw axis, in such a way, that by displacing the expander, the clamping part may be clamped tight within the clearance hole. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- retaining means for retaining the plate on a bone and including sleeves each having a clamping part extending through the clearance hole and provided with slots and an inner contact surface and an outer surface which bears at least in part against the surface bounding the clearance hole, the outer surface of the clamping part of at least one of said sleeves being disposed eccentric in relation to the screw axis; and
-
15. A device connectable with a bone, comprising a plate with at least two clearance holes;
- retaining means for retaining the plate on a bone of two bone pieces and including sleeves each having a clamping part extending through the clearance hole and provided with slots and an inner contact surface and an outer surface which bears at least in part against the surface bounding the clearance hole and the outer surface of at least one of the sleeves is disposed eccentric in relation to the screw axis, said sleeves each having a collar made of one piece with the clamping part and protruding beyond the outer surface of the latter so as to bear against the outer side of the plate facing away from the bone; and
screws for fastening the plate to the bone and each having an axis, a threaded portion to be screwed into the bone, and an expander displaceable relative to the clamping part in an axial direction and having a contact surface in contact with the contact surface of the clamping part and coaxial with the screw axis in at least one position of the screw, in which position at least one of the said two contact surfaces converges in the direction of the screw axis, in such a way, that by displacing the expander, the clamping part may be clamped tight within the clearance hole, and upon rotation of said sleeve and screwing-in of said screw, the bone pieces are displaced toward and compressed to one another under the action of the eccentric outer surface of said clamping part, the screws expand the clamping part in the clearance holes of the plate, and the collars bear against the outer side of the plate.
- retaining means for retaining the plate on a bone of two bone pieces and including sleeves each having a clamping part extending through the clearance hole and provided with slots and an inner contact surface and an outer surface which bears at least in part against the surface bounding the clearance hole and the outer surface of at least one of the sleeves is disposed eccentric in relation to the screw axis, said sleeves each having a collar made of one piece with the clamping part and protruding beyond the outer surface of the latter so as to bear against the outer side of the plate facing away from the bone; and
Specification