Resorbable anterior cervical plating system with screw retention mechanism
First Claim
1. A bone plate assembly comprising:
- a bone plate having an upper side and an underside and at least one fixation hole having a first diameter, the fixation hole extending from the upper side to the underside, wherein an area of the bone plate adjacent the fixation hole has a first thickness; and
at least one fastener, the fastener having a head, a shaft, and a relief region, the head having a larger width than the shaft, the shaft having a core diameter and threads, the threads having a pitch, and an outer thread diameter, and the relief region having a length and second diameter, wherein the first diameter is smaller than the outer thread diameter but larger than the second diameter, and wherein the length of the relief is greater than the first thickness of the bone plate.
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Accused Products
Abstract
A bone stabilization or fixation assembly may include a bone plate having an upper side and an underside and at least one fixation hole having a first diameter and the hole extending from the upper side to the underside. The area of the bone plate adjacent the fixation hole has a first thickness. The bone stabilization assembly further includes at least one fastener having a head, a shaft, and a relief. The head has a larger dimension than the shaft. The shaft may have threads having a pitch, a core diameter and an outer thread diameter. The relief has a length and a second diameter. The first diameter of the fixation hole may be smaller than the outer thread diameter but larger than the second diameter of the relief. Also, the length of the relief may be greater than the first thickness of the bone plate. The first diameter may be greater than, equal to, or less than the core diameter of the shaft.
105 Citations
20 Claims
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1. A bone plate assembly comprising:
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a bone plate having an upper side and an underside and at least one fixation hole having a first diameter, the fixation hole extending from the upper side to the underside, wherein an area of the bone plate adjacent the fixation hole has a first thickness; and
at least one fastener, the fastener having a head, a shaft, and a relief region, the head having a larger width than the shaft, the shaft having a core diameter and threads, the threads having a pitch, and an outer thread diameter, and the relief region having a length and second diameter, wherein the first diameter is smaller than the outer thread diameter but larger than the second diameter, and wherein the length of the relief is greater than the first thickness of the bone plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A bone plate assembly comprising:
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a bone fixation device having an upper side, an underside and at least one aperture configured to receive a bone fastener, the aperture having a smallest diameter d1 and wherein a region of the bone plate adjacent the aperture has a first thickness; and
a bone fastener having a head with a diameter, threads with a pitch and an outer thread diameter, and a relief region with a first length and a first diameter and no threads, wherein the outer thread diameter is greater than the smallest diameter d1 of the aperture, and the length of the relief region is greater than the first thickness. - View Dependent Claims (13, 14)
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15. A method of fixing a bone plate to a bone, the method comprising:
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selecting the bone plate having an upper side, an underside, and at least four plate fixation holes extending from the upper side to the underside, the fixation holes having a diameter that is smallest between the underside and the upper side of the bone plate and wherein an area of the bone plate adjacent the fixation hole has a first thickness;
drilling and tapping the bone plate for inserting at least two bone fasteners;
inserting at least two bone fasteners having threads with a pitch and an outer thread diameter and a relief region with a first length and first diameter through at least two of the plate fixation holes; and
verifying screw retention visually or by tactile feedback, wherein the outer thread diameter is greater than the smallest diameter of the fixation hole, and wherein the first diameter is not greater than the smallest diameter of the fixation hole and the length of the relief region is greater than the first thickness such that when the at least two bone fasteners are fully seated in the bone plate the fastener disengages from the bone plate.
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16. A bone fixation assembly comprising:
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a bone fixation device having an aperture configured to receive a bone fastener and an aperture boundary surrounding the aperture; and
a bone fastener receivable in the aperture in an installed position, the fastener having a shaft portion, a head portion, and a retainer portion extending radically outward and configured to engage the bone fixation device at the boundary of the aperture to restrain withdrawal of the bone screw from the installed position. - View Dependent Claims (17, 18, 19, 20)
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Specification