Bone fastener and instrument for insertion thereof
First Claim
1. A bone fastener and surgical instrument used for holding internal and external surfaces of a cranial bone cover relative to internal and external surfaces of surrounding cranial bone, said bone fastener and said surgical instrument comprising:
- a bone fastener including, a first fastening member having a first inner face and a first outer face, a second fastening member having a second inner face and a second outer face, and an elongated member extending from said first fastening member; and
a surgical instrument having a first engagement member operable to engage said elongated member extending from said first fastening member and a second member operable to adjustably position said second fastening member relative to said first fastening member by engaging said second fastening member with said elongated member, wherein upon adjustably positioning said second fastening member relative to said first fastening member with said surgical instrument, the internal and external surfaces of the cranial bone cover and the surrounding cranial bone are engaged by said first inner face of said first fastening member and said second inner face of said second fastening member to fix a first transverse face of the cranial bone cover in apposition with a second transverse face of the surrounding cranial bone and position the internal and external surfaces of the cranial bone cover substantially co-planar with the internal and external surfaces of the surrounding cranial bone.
7 Assignments
0 Petitions
Accused Products
Abstract
A bone member fastener for closing a craniotomy includes a cap and a base interconnected by a narrow cylindrical collar. The cap has an externally threaded stud that screws into an internally threaded bore of the collar, thereby allowing the cap and base to be brought into clamping engagement against the internal and external faces of a bone plate and surrounding bone. In a particularly disclosed embodiment, the base of the fastener is placed below a craniotomy hole with the collar projecting into the hole, and the stud of the cap is screwed into the bore of the base from above the hole to clamp a bone flap against the surrounding cranium. This device provides a method of quickly and securely replacing a bone cover into a craniotomy. The distance between the cap and base can be selected by how far the threaded stud of the cap is advanced into the internally threaded collar. The fastener is therefore adaptable for use in several regions of the skull having various thicknesses. An insertion tool with a long handle permits safe and convenient placement of the base between the brain and the internal face of the bone plate. Some disclosed embodiments of the fastener have a cap and base that conform to the curved surface of the skull, for example by having an arcuate shape or flexible members that conform to the curvature of the bone plate and surrounding cranial bone as the fastener is tightened.
-
Citations
36 Claims
-
1. A bone fastener and surgical instrument used for holding internal and external surfaces of a cranial bone cover relative to internal and external surfaces of surrounding cranial bone, said bone fastener and said surgical instrument comprising:
-
a bone fastener including, a first fastening member having a first inner face and a first outer face, a second fastening member having a second inner face and a second outer face, and an elongated member extending from said first fastening member; and
a surgical instrument having a first engagement member operable to engage said elongated member extending from said first fastening member and a second member operable to adjustably position said second fastening member relative to said first fastening member by engaging said second fastening member with said elongated member, wherein upon adjustably positioning said second fastening member relative to said first fastening member with said surgical instrument, the internal and external surfaces of the cranial bone cover and the surrounding cranial bone are engaged by said first inner face of said first fastening member and said second inner face of said second fastening member to fix a first transverse face of the cranial bone cover in apposition with a second transverse face of the surrounding cranial bone and position the internal and external surfaces of the cranial bone cover substantially co-planar with the internal and external surfaces of the surrounding cranial bone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A method of holding internal and external surfaces of a cranial bone cover relative-to internal and external surfaces of surrounding cranial bone, said method comprising:
-
performing an osteonomy to form the cranial bone cover having a first transverse face between the internal and external surfaces of the cranial bone cover and a second transverse face between the internal and external surfaces of the surrounding cranial bone;
providing a first fastening member having a first inner face and a first outer face;
providing a second fastening member having a second inner face and a second outer face;
providing an elongated member extending from the first fastening member;
providing an instrument having a first engagement member operable to engage the elongated member extending from the first fastening member and a second member operable to move the first fastening member relative to the second fastening member;
using the instrument to adjustably position the second fastening member relative to the first fastening member by engaging the second fastening member with the elongated member; and
engaging the internal and external surfaces of the cranial bone cover and the surrounding cranial bone with the first inner face of the first fastening member and the second inner face of the second fastening member to fix the first transverse face of the cranial bone cover in apposition with the second transverse face of the surrounding cranial bone and position the internal and external surfaces of the cranial bone cover substantially co-planar with the internal and external surfaces of the surrounding cranial bone. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
-
-
28. A method of holding internal and external surfaces of a cranial bone cover relative to internal and external surfaces of surrounding cranial bone, said method comprising:
-
performing an osteonomy to form the cranial bone cover having a first transverse face between the internal and external surfaces of the cranial bone cover and a second transverse face between the internal and external surfaces of the surrounding cranial bone;
providing a first fastening member having a first inner face and a first outer face;
providing a second fastening member having a second inner face and a second outer face;
providing an elongated member extending from the first fastening member having a sidewall with a plurality of radially extending projections extending from at least a portion of the sidewall;
providing a first engagement member operable to engage the elongated member extending from the first fastening member;
positioning the first inner face of the first fastening member relative to the internal surfaces of the cranial bone cover and the surrounding cranial bone;
engaging the elongated member with the first engagement member to secure the first fastening member to the first engagement member;
providing a second member operable to engage the second fastening member;
using the first engagement member and the second member to adjustably position the second fastening member relative to the first fastening member by allowing the radially extending projections on the sidewall of the elongated member to engage the second fastening member; and
engaging the internal and external surfaces of the cranial bone cover and the surrounding cranial bone with the first inner face of the first fastening member and the second inner face of the second fastening member to fix the first transverse face of the cranial bone cover in apposition with the second transverse face of the surrounding cranial bone and position the internal and external surfaces of the cranial bone cover substantially co-planar with the internal and external surfaces of the surrounding cranial bone. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36)
-
Specification