Tool for driving pedicle screws
First Claim
1. A tool for driving pedicle screws into a vertebra of the human spine, comprising a shaft having a handle at one end and at the opposite end having a holder for receiving a ring-shaped head of a pedicle screw, which head is flattened on opposite sides, wherein said holder comprises a first clamping jaw (18) and a second clamping jaw (20), wherein said first clamping jaw (18) is secured to the shaft (12), wherein said second clamping jaw (20) is movable and includes a lateral projection (24) which is tiltably received by the first clamping jaw (18) and wherein an axially slidable actuating member (50) is guided along the shaft (12), wherein said actuating member engages said second clamping jaw (20) so as to urge said second clamping jaw (20) to tilt toward said first clamping jaw by a thread driving means, wherein the first clamping jaw (18) includes a slot (13) and wherein said projection (24) includes a hook-shaped portion (26) engaging said first clamping jaw (18).
2 Assignments
0 Petitions
Accused Products
Abstract
A tool for driving pedicle screws into vertebrae of the human spine has a shaft preferably with a handle at one end and, at the opposite end, a holder for receiving a preferably ring-shaped head which is flattened on opposite sides. The tool has a first clamping jaw (18) secured to the shaft (12), and a second loose clamping jaw (20) including a lateral projection which is tiltably received by the first clamping jaw (18). The tool has an axially slidable actuating member (32) which is guided along the shaft (12). The front end of the actuating member (32) engages the rear end of the second clamping jaw (20) and is preferably axially urged towards the second clamping jaw (20) by a threaded driving means.
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Citations
15 Claims
- 1. A tool for driving pedicle screws into a vertebra of the human spine, comprising a shaft having a handle at one end and at the opposite end having a holder for receiving a ring-shaped head of a pedicle screw, which head is flattened on opposite sides, wherein said holder comprises a first clamping jaw (18) and a second clamping jaw (20), wherein said first clamping jaw (18) is secured to the shaft (12), wherein said second clamping jaw (20) is movable and includes a lateral projection (24) which is tiltably received by the first clamping jaw (18) and wherein an axially slidable actuating member (50) is guided along the shaft (12), wherein said actuating member engages said second clamping jaw (20) so as to urge said second clamping jaw (20) to tilt toward said first clamping jaw by a thread driving means, wherein the first clamping jaw (18) includes a slot (13) and wherein said projection (24) includes a hook-shaped portion (26) engaging said first clamping jaw (18).
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7. A tool for driving a pedicle screw into a vertebra of the human spine, said tool comprising:
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(a) a shaft having a first end and a second end; (b) a holder for receiving a head of a pedicle screw, said holder being located at said second end of said shaft, said holder comprising; (1) a first clamping jaw substantially rigidly secured to said shaft and (2) a movable second clamping jaw having a projection which is tiltably received by said first clamping jaw; and (c) an actuating member which is axially movable along said shaft and engageable with said second clamping jaw so as to tilt said second clamping jaw toward said first clamping jaw wherein said first clamping jaw includes a guide recess and wherein said projection includes a hook-shaped portion for engaging said first clamping jaw. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A tool for driving a pedicle screw into a vertebra of a human spine, said tool comprising:
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(a) a shaft having a first end and a second end and a slot therewithin; (b) a holder for receiving a head of a pedicle screw, said holder being located at said first end of said shaft, said holder comprising; (1) a first clamping jaw into which said slot extends and having a receptacle (15) therein and being substantially rigidly secured to said shaft and (2) a movable second clamping jaw having a hook-shaped curved projection which is tiltably received within said slot in said first clamping jaw and said projection having an end which fits securely within said receptacle in said first clamping jaw but permits rotation of said curved projection within said receptacle with respect to said first clamping jaw; and (c) a plate-shaped thrust member having a first extension extending therefrom and being axially movable within said slot located longitudinally within said shaft and being engageable at said first extension with said second clamping jaw at a single point on said curved projection so as to tilt said second clamping jaw with respect to said first clamping jaw so as to cause said holder to close and to be able to grasp said pedicle screw firmly. - View Dependent Claims (14, 15)
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Specification