BONE COMPRESSION SYSTEM AND ASSOCIATED METHODS

摘要

Systems and associated methods for repairing first and second bone fragments include a bone compression device characterized by an elongated fastener and an anchor. The fastener includes an externally-threaded shank, an enlarged head, and a bore extending through both. The anchor includes an internally-threaded bore configured to receive the threaded shank of the fastener at a first end of the anchor, and an enlarged shoulder at a second end. The fastener inserts fittedly into a first bore formed in the first and second bone fragments, with the head engaging a rim of the first bore. The anchor inserts fittedly into a second bore formed in the second bone fragment, the anchor shoulder engaging a rim of the second bore. During compression of the bone segments, a small space is maintained between the second end of the anchor and an intersection of the first bore and the second bore.

主权项

1. A bone compression device comprising:
an elongated fastener having
a shank portion with an externally-threaded portion and first and second ends,an enlarged head portion coupled to the first end of the shank portion, anda bore extending through the head and shank portions and configured to provide access through the fastener, and an anchor having
an internally-threaded bore, andfirst and second ends, the first end configured to threadedly receive at least part of the externally-threaded portion of the shank portion of the fastener, and the second end characterized by an enlarged shoulder; wherein the shank portion of the fastener is configured to insert fittedly into a first bore formed in the first and second bone fragments such that the shank portion extends through the first bone fragment and at least partially through the second bone fragment with the head portion engaging a rim of the first bore in the first bone fragment; and wherein the anchor is configured to insert fittedly into a second bore formed in the second bone fragment, the second bore having a diameter greater than a diameter of the first bore and the second bore positioned coaxial with the first bore and configured to form a counterbore floor at an intersection of the first bore and the second bore, with the anchor shoulder engaging a rim of the second bore to define a small space between the counterbore floor of the second bore and the first end of the anchor, wherein the small space is characterized by a distance between three (3) millimeters and a minimum distance required to prevent contact of the first end of the anchor with the counterbore floor of the second bore based on a bending moment of the second bone fragment.