Bone plate system
AssigneeJeil Medical Corporation
InventorsChan Bong KIM, Jang Hyeon SEO, Sung Kyu CHOI
Life of this patent
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Abstract
A bone plate system for fracture surgery is provided. The bone plate system includes a bone plate and a locking screw. The bone plate includes an upper surface, a lower surface facing a bone, and a locking hole in which an even-number-ridge internal thread is formed. The locking screw is coupled to the locking hole. The locking screw includes a head tapered so that a diameter thereof decreases along a center axis, a shank extending from the head, a double-ridge external thread formed on the head and configured to be tightened to the even-number-ridge internal thread, and an external thread formed on the shank and configured to be fastened to the bone.
Claims9
A bone plate system, comprising:
- a bone plate including an upper surface, a lower surface facing a bone, and a locking hole in which an even-number-ridge internal thread is formed;
- and
- a locking screw coupled to the locking hole, the locking screw including a head tapered so that a diameter thereof decreases along a center axis, a shank extending from the head, a double-ridge external thread formed on the head and configured to be tightened to the even-number-ridge internal thread, and an external thread formed on the shank and configured to be fastened to the bone,
- wherein the even-number-ridge internal thread and the double-ridge external thread are equal in lead to each other,
- a depth of a valley having a maximum major diameter among valleys of the double-ridge external thread is set larger than a height of ridges of the even-number-ridge internal thread so that when the double-ridge external thread is tightened to the even-number-ridge internal thread, the locking screw is obliquely tightened with respect to a center axis of the locking hole, and
- a plurality of screw entry guide grooves is formed at ridge start points of the even-number-ridge internal thread so as to guide entry of the double-ridge external thread.
Dependencies are inferred from the claim text.