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US 8,784,458 B1Granted
Polyaxial insert for surgical screws
AssigneeGreatbatch Medical S.A.
InventorsPatrick M. White, Fabrice Chenaux, Jean-Sebastien Merette
Life of this patent
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Abstract
An improved insert for assembly with a bone plate is described. The insert has a first opening adapted to receive a set screw and a second opening adapted to receive a bone screw. The insert is connectable to the bone plate using a set screw. The insert in conjunction with the set screw provides an improved range of relative motion for placing the bone screw at outboard locations with respect to the bone plate. That way, bone fragments that are not necessarily reachable using the bone plate without the insert can be secured together for improved healing.
Claims23
An insert disc for a bone plate, the insert disc comprising:
- a) an outer sidewall providing an insert disc thickness extending from a bottom surface to a top surface of the insert disc, wherein at least one of the top and bottom surfaces is planar;
- b) a first, unthreaded aperture extending through the insert disc thickness, wherein the first aperture comprises:
- i) a top region sidewall sloping downwardly and inwardly part-way through the insert disc thickness from a first diameter at the top surface to a ridge having a second diameter less than the first diameter, and
- ii) a bottom region sidewall extending from the ridge to the bottom surface, wherein the bottom region sidewall is aligned substantially perpendicular to the at least one of the top and bottom planar surfaces of the insert disc;
- c) a second, threaded aperture extending through the insert disc thickness;
- and
- d) an inlet that extends through the outer sidewall of the insert disc and is in open communication with the first, unthreaded aperture, but not the second, threaded aperture,
- e) wherein the first and second apertures are not in open communication with each other.
5 more elements
An assembly comprising an insert disc for threadingly receiving a bone screw threaded into a bone plate, the assembly comprising:
- a) a bone plate comprising:
- i) a plate thickness extending from a bone-contacting bottom side to a top side;
- ii) at least a first plate aperture and a second plate aperture extending through the plate thickness, at least one of the first and second plate apertures having threads;
- b) a bone screw having threads that are adapted to threadingly engage with the threads of the at least one of the first and second apertures of the bone plate;
- c) an insert disc comprising:
- i) an outer sidewall providing an insert disc thickness extending from a bottom surface to a top surface of the insert disc, wherein at least one of the top and bottom surfaces is planar;
- ii) a first, unthreaded aperture extending through the insert disc thickness, wherein the first aperture comprises:
- a top region sidewall sloping downwardly and inwardly part-way through the insert disc thickness from a first diameter at the top surface to a ridge having a second diameter less than the first diameter, and
- a bottom region sidewall extending from the ridge to the bottom surface, wherein the bottom region sidewall is aligned substantially perpendicular to the at least one of the top and bottom planar surfaces of the insert disc;
- iii) a second, threaded insert aperture extending through the insert disc thickness;
- and
- iv) an inlet that extends through the outer sidewall of the insert disc and is in open communication with the first, unthreaded aperture, but not the second, threaded aperture,
- v) wherein the first and second insert apertures are not in open communication with each other;
- and
- d) wherein with the insert disc contacting the bone plate, a set screw received in the first, unthreaded insert aperture is threadingly engageable with the threads of the at least one of the first and second plate apertures.
12 more elements
An assembly comprising an insert disc for threadingly receiving a bone screw threaded into a bone plate, the assembly comprising:
- a) a bone plate comprising:
- i) a plate thickness extending from a bone-contacting bottom side to a top side;
- ii) at least one complex aperture extending through the plate thickness from the top side to the bottom side thereof,
- iii) wherein the complex aperture comprises at least one set of immediately adjacent first and second plate apertures, and
- iv) wherein the complex aperture comprises an unthreaded compression ramp extending from an opening at the top side of the bone plate downwardly and inwardly part way through the plate thickness to a threaded lower portion providing an hourglass shape;
- b) a bone screw having threads that are adapted to threadingly engage with either one or both of the immediately adjacent first and second plate apertures of the complex aperture;
- c) an insert disc that is nestable in the complex aperture of the bone plate, the insert disc comprising:
- i) an outer sidewall providing an insert disc thickness extending from a bottom surface to a top surface of the insert disc, wherein at least one of the top and bottom surfaces is planar;
- ii) a first, unthreaded aperture extending through the insert disc thickness, wherein the first aperture comprises:
- a top region sidewall sloping downwardly and inwardly part-way through the insert disc thickness from a first diameter at the top surface to a ridge having a second diameter less than the first diameter, and
- a bottom region sidewall extending from the ridge to the bottom surface, wherein the bottom region sidewall is aligned substantially perpendicular to the at least one of the top and bottom planar surfaces of the insert disc;
- iii) a second, threaded insert aperture extending through the insert disc thickness;
- and
- iv) an inlet that extends through the outer sidewall of the insert disc and is in open communication with the first, unthreaded aperture, but not the second, threaded aperture,
- v) wherein the first and second insert apertures are not in open communication with each other;
- and
- d) wherein with the insert disc contacting the bone plate, a set screw received in the first, unthreaded insert aperture is threadingly engageable with the threads of the at least one of the first and second plate apertures of the complex aperture.
14 more elements
Dependencies are inferred from the claim text.