Orthopaedic done screw apparatus
First Claim
1. A bone screw apparatus comprising;
- a) an elongated shaft having proximal and distal end portions, the distal end portion having a cutting head and the proximal end portion being sized and shaped to fit a driver tool such as a drill chuck;
b) the shaft being externally threaded along at least a portion of its length and having at least one longitudinally extending shaped surface thereon;
c) a removable head with a central opening that enables the head to slide along the shaft;
d) means for preventing sliding movement of the head along the shaft distal to proximal;
e) the head central opening being shaped to conform to the shaped surface of the shaft so that the head and shaft can be rotated as a unit by engaging and rotating the head; and
f) a tool receptive surface portion of the head that accepts a driver tool for rotating the head and the connected shaft.
1 Assignment
0 Petitions
Accused Products
Abstract
A bone screw apparatus and method of implantation provides a bone screw having an elongated shaft of an oversized length with proximal and distal end portions. The distal end portion of the shaft has a cutting head. The proximal end portion of the shaft is sized and shaped to accept a driver tool, such as a drill chuck. The shaft is externally threaded along a majority of its length. A pair of opposed longitudinally extending circumferentially spaced flat surfaces are provided along the shaft. A removable head with a central opening enables the head to slide along the shaft proximally to distally. A ratcheting mechanism prevents movement of the head along the shaft in but one direction. A central opening of the head is shaped to conform to the shaped surfaces of the shaft, so that the head and shaft can be rotated as a unit by engaging and rotating the head. The tool receptive surface portion of the head includes intersecting external surfaces of the head spaced radially away from the shaft during use.
177 Citations
25 Claims
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1. A bone screw apparatus comprising;
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a) an elongated shaft having proximal and distal end portions, the distal end portion having a cutting head and the proximal end portion being sized and shaped to fit a driver tool such as a drill chuck; b) the shaft being externally threaded along at least a portion of its length and having at least one longitudinally extending shaped surface thereon; c) a removable head with a central opening that enables the head to slide along the shaft; d) means for preventing sliding movement of the head along the shaft distal to proximal; e) the head central opening being shaped to conform to the shaped surface of the shaft so that the head and shaft can be rotated as a unit by engaging and rotating the head; and f) a tool receptive surface portion of the head that accepts a driver tool for rotating the head and the connected shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A bone screw apparatus comprising;
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a) an elongated shaft having proximal and distal end portions, the distal end portion having a cutting head and the proximal end portion being sized and shaped to fit a driver tool such as a drill chuck; b) the shaft being externally threaded along a majority of its length and having a plurality of longitudinally extending, circumferentially spaced apart shaped surfaces thereon; c) a removable head with a central opening that enables the head to slide along the shaft; d) the head having ratchets thereon that prevent sliding movement of the head along the shaft in a distal to a proximal direction; e) the head central opening being shaped to conform to the shaped surfaces of the shaft so that the head and shaft can be rotated as a unit by engaging and rotating the head; and f) a tool receptive surface portion of the head that accepts a driver tool for rotating the head and the connected shaft. - View Dependent Claims (11)
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12. A method of implanting a bone screw through a patient'"'"'s bone tissue, comprising the steps of:
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a) inserting a bone screw shaft into a patient'"'"'s bone tissue, the shaft having an external surface with shaped longitudinally extending portions; b) placing a removable head on the shaft after the shaft is embedded in step "a" by sliding the head proximally to distally along the shaft until the head engages the patient; c) severing the shaft proximally of the head; and d) interlocking the head and shaft so that they rotate together. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method of implanting a bone screw through a patient'"'"'s bone tissue, comprising the steps of:
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a) inserting a bone screw shaft into a patient'"'"'s bone tissue, the shaft having an external surface with shaped longitudinally extending portions; b) placing a removable head on the shaft after the shaft is embedded in step "a" by sliding the head in a proximal to distal direction along the shaft until the head engages the patient; c) severing the shaft proximally of the head; d) interlocking the head and shaft so that they rotate together; and e) further comprising the step between step "b" and "c" of disallowing movement of the head in a distal to proximal direction with a ratchet mechanism. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification