Recess drive bone screw and cooperable driving tool
First Claim
1. A bone screw for attaching an implant to a bone portion, the bone screw comprising a head adapted to engage an implant and a threaded shaft configured for engaging the bone portion, wherein the head includes a recessed drive socket for receiving a partially mating, rotational drive tool therein, wherein the socket comprises a socket cavity having a generally cylindrical wall having a longitudinal length, said cylindrical wall substantially smooth throughout said longitudinal length and interrupted by a plurality of pre-formed driving corners formed by a pair of substantially planar surfaces joined at a junction, each surface abutting the cylindrical wall, wherein said driving corners receive a portion of the driver tool therein.
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Accused Products
Abstract
A fastener with a recessed drive socket and a driving tool with a cooperable driving head. The socket having a cylindrical interior wall interrupted by a plurality of driving corners. The driver having a tapered driving head including a plurality of sharpened driving edges adapted to engage the driving corners. The tapered driving end may be axially forced into the driving socket such that the plurality of driving edges frictionally engage the driving corners to hold the fastener on the driver and to enhance torque transmission. The cylindrical walls of the socket and the walls of the driver bit between the driving edges cooperate to define a fluid channel for passage of fluid around the driving head during positioning within the socket.
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Citations
21 Claims
- 1. A bone screw for attaching an implant to a bone portion, the bone screw comprising a head adapted to engage an implant and a threaded shaft configured for engaging the bone portion, wherein the head includes a recessed drive socket for receiving a partially mating, rotational drive tool therein, wherein the socket comprises a socket cavity having a generally cylindrical wall having a longitudinal length, said cylindrical wall substantially smooth throughout said longitudinal length and interrupted by a plurality of pre-formed driving corners formed by a pair of substantially planar surfaces joined at a junction, each surface abutting the cylindrical wall, wherein said driving corners receive a portion of the driver tool therein.
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5. A bone screw and driver combination, comprising:
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a bone screw having a drive socket, said socket having a substantially cylindrical wall having a longitudinal length, said wall substantially smooth throughout said longitudinal length, and a plurality of pre-formed driving corners formed by a pair of substantially planar surfaces joined at a junction, each surface abutting the cylindrical wall; and a driver having a driving head including a plurality of driving edges sized for mating engagement with corresponding driving corners of said bone screw, said driving head further defining a recessed area between each driving edge. - View Dependent Claims (6, 7, 8, 11)
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9. A bone screw and driver combination, comprising:
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a bone screw having a recessed drive socket, said socket defined by a substantially cylindrical interior wall having a longitudinal length, said interior wall substantially smooth throughout said longitudinal length and interrupted by a plurality of driving corners formed by a pair of substantially planar surfaces joined at a junction, each surface abutting the cylindrical interior wall, a driver having a driving head including an outer surface defining a plurality of driving edges spaced for mating engagement with the corresponding driving corners of said bone screw, said cylindrical interior wall of said bone screw and said outer surface of said driver define at least one fluid channel, said fluid channel permitting the passage of fluid during movement of said driver with respect to said recessed drive socket. - View Dependent Claims (14, 15, 16)
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17. A bone screw and driver combination, comprising:
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a bone screw having a recessed drive socket, said socket defined by a plurality of driving corners formed by a pair of substantially planar surfaces joined at a junction, each of said driving corners separated from an adjacent driving corner by a concave surface having a longitudinal length, said concave surface substantially smooth throughout said longitudinal length, each substantially planar surface abutting a concave surface; and a driver having a driving head including an outer surface defining a plurality of driving edges spaced apart by a plurality of recessed surfaces, wherein the driving edges are provided for mating engagement with the driving corners of said bone screw and the recessed surfaces are adapted to prevent complete engagement of said driving head with said concave surface. - View Dependent Claims (18, 19, 20)
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21. A bone screw for attaching an implant to a bone portion, the bone screw comprising:
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a threaded shaft configured for engaging the bone portion and having an outer thread diameter of between about 1.0 mm and about 5.0 mm; and a head adapted to engage an implant, wherein the head includes a recessed drive socket for receiving a partially mating, rotational drive tool therein, the socket comprising a socket cavity having a generally cylindrical wall having a longitudinal length, said cylindrical wall substantially smooth throughout said longitudinal length and interrupted by a plurality of pre-formed driving corners formed by the junction of a pair of substantially planar surfaces each surface abutting the cylindrical wall, said driving corners spaced apart by a plurality of concave surfaces, wherein the concave surfaces are adapted to inhibit hydraulic lock by bodily fluids from inducing bone screw pullout upon disengagement of the drive tool from the recessed socket.
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Specification