Inserter for soft tissue or bone-to-bone fixation device and methods
A positioning and installation tool for a fixation implant is inserted through a single, simple drill hole and positioned in place. The device controls the degree to which the implant is deployed and prevents accidental disengagement of the device from the implant before deployment has completed. The device also guides the components of the implant involved in active tendon compression at the aperture of the bone tunnel. The implant is deployed simply by rotating a knob, thereby creating an anchor point of high stiffness and fixation strength. When deployment has completed, the inserter is disengaged from the affixed implant by simply pulling a release mechanism.
1. A device for positioning and deploying a fixation implant, comprising:
a handle;
an insertion shaft extending distally from said handle;
an implant retention mechanism disposed on a distal end of said insertion shaft, wherein the implant retention mechanism is configured to engage the insertion shaft to the fixation implant;
an implant deployment control comprising a rotatable knob disposed on said handle, wherein rotation of the knob deploys the implant retention mechanism;
an implant release control disposed on said handle, wherein movement of the implant release control relative to the handle retracts the implant retention mechanism to release the implant retention mechanism;
a safety mechanism disposed on said handle for preventing unintentional actuation of the deployment control, said safety mechanism comprising a safety pin which in a first position prevents rotation of the rotatable deployment knob and in a second position permits rotation of the rotatable deployment knob; and
a deployment mechanism for limiting rotation of the deployment knob to only one direction, wherein because the deployment knob may only be rotated in one direction, the deployment mechanism may be advanced distally, but not retracted proximally.
2. The device as recited in claim 1 , and further comprising a suture cleat on said handle on which suture may be wrapped.
3. The device as recited in claim 1 , wherein the implant retention mechanism comprises a ball detent mechanism, said ball detent mechanism comprising a detent ball, a detent ball retainer, and a ball detent rod.
4. The device as recited in claim 3 , and further comprising an insertion shaft spring disposed on said ball detent rod.
5. The device as recited in claim 3 , and further comprising a fixation implant, wherein said fixation implant comprises an implant screw for deploying the fixation implant, said implant screw comprising a head having a hole for engaging said detent ball.
6. The device as recited in claim 1 , wherein said implant release control comprises a knob which is movable proximally to disengage said implant retention mechanism from a fixation implant engaged therewith.
7. The device as recited in claim 1 , and further comprising a hex tube disposed at the distal end of the insertion shaft, said implant retention mechanism being disposed on said hex tube, and said hex tube having a recess for receiving a portion of said fixation implant.
8. The device as recited in claim 5 , wherein said implant screw further comprises internal left-hand threads disposed on an interior surface in said head, defining said hole, so that the implant screw may be disengaged from the fixation implant.
9. The device as recited in claim 8 , wherein the implant screw further comprises a shaft having external threads, extending distally from said head.
10. The device as recited in claim 6 , wherein said implant release knob is proximal to and coaxial with said deployment knob.
11. The device as recited in claim 6 , wherein pulling said implant release knob proximally releases the implant retention mechanism.
12. The device as recited in claim 1 , wherein the mechanism for limiting rotation of the deployment knob to only one direction comprises a ratchet shaft to which the deployment knob is attached.
13. The device as recited in claim 12 , and further comprising a pawl for engaging the ratchet shaft, wherein engagement of the pawl with portions of the ratchet shaft operates to limit rotation of the deployment knob to only one direction.
14. A device for positioning and deploying a fixation implant, comprising:
a handle;
an insertion shaft extending distally from said handle;
an implant retention mechanism disposed on a distal end of said insertion shaft, wherein the implant retention mechanism comprises a ball detent mechanism, said ball detent mechanism comprising a detent ball, a detent ball retainer, and a ball detent rod, wherein the implant retention mechanism is configured to engage the insertion shaft to the fixation implant;
an implant deployment control comprising a rotatable knob disposed on said handle, wherein rotation of the knob deploys the implant retention mechanism;
an implant release control disposed on said handle, wherein movement of the implant release control relative to the handle retracts the implant retention mechanism to release the implant retention mechanism;
a safety mechanism disposed on said handle for preventing unintentional actuation of the deployment control, said safety mechanism comprising a safety pin which is removable to permit rotation of the rotatable deployment knob; and
a fixation implant, wherein said fixation implant comprises an implant screw for deploying the fixation implant, said implant screw comprising a head having a hole for engaging said detent ball.
15. The device as recited in claim 14 , and further comprising an insertion shaft spring disposed on said ball detent rod.
16. The device as recited in claim 14 , wherein said implant screw further comprises internal left-hand threads disposed on an interior surface in said head, defining said hole, so that the implant screw may be disengaged from the fixation implant.
17. The device as recited in claim 16 , wherein the implant screw further comprises a shaft having external threads, extending distally from said head.
18. The device as recited in claim 14 , wherein said implant release knob is proximal to and coaxial with said deployment knob.
19. The device as recited in claim 14 , wherein pulling said implant release knob proximally releases the implant retention mechanism.