Minimally invasive tool to facilitate implanting a pedicle screw and housing
View Patent ↗A minimally invasive tool to facilitate implanting a pedicle screw and housing is provided. The minimally invasive tool includes a first sleeve having flexible tabs that couple to a housing and a second sleeve slidably engaged in the first sleeve. The second sleeve provides reinforcing such that the first and second sleeve provide counter torque for driving the pedicle screw.
1. A tool for facilitating minimally invasive surgical procedures, the tool comprising:
a first sleeve, the first sleeve comprising:
a distal end having a distal tip, and a proximate end opposite the distal end,
an inner surface and an outer surface, the inner surface defining a first diameter,
a plurality of tabs elastically attached to the distal end of the first sleeve,
a plurality of first slots in the distal end of the first sleeve separating the plurality of tabs,
a mating surface on at least one of the plurality of tabs, wherein the mating surface is adapted to engage a corresponding mating surface on a housing, and
at least one protrusion coupled to the inner surface proximate the distal tip and projecting radially inwardly,
a second sleeve, the second sleeve comprising:
a distal end having a distal tip and a proximate end opposite the distal end,
an inner surface and an outer surface, the outer surface defining a second diameter less than the first diameter,
at least one channel at the distal end proximate the distal tip corresponding to the at least one protrusion;
wherein the at least one protrusion and the at least one channel are configured to selectively lock with one another;
a connector adapted to couple the proximate end of the first sleeve with the proximate end of the second sleeve, wherein the outer surface of the second sleeve is slidingly engaged with the inner surface of the first sleeve such that the at least one protrusion proximate the distal tip of the first sleeve fits in the corresponding at least one channel proximate the distal tip of the second sleeve, wherein the second sleeve is slidably inserted in the first sleeve until the at least one protrusion fits in the corresponding at least one channel and inhibits the elasticity and rotational movement of the plurality of tabs.
2. The tool according to claim 1 wherein the at least one protrusion comprises an alignment tab having a flared surface.
3. The tool according to claim 1 wherein the at least one channel comprises a tapered channel to engage the corresponding at least one protrusion.
4. The tool according to claim 1 wherein the first sleeve is adapted to rotationally lock relative to the second sleeve when the at least one protrusion is disposed in the corresponding at least one channel.
5. The tool according to claim 1 wherein the connector is a threaded connector adapted to threadedly couple the proximate end of the first sleeve to the proximate, end of the second sleeve.
6. The tool according to claim 5 wherein the at least one protrusion is adapted to be further drawn into the at least one channel when the first and second sleeves are threadedly coupled.
7. The tool according to claim 1 wherein the first sleeve inner surface further comprises an alignment ridge adapted to engage an alignment track disposed in the second sleeve.
8. The tool according to claim 7 wherein the second sleeve is adapted to be slidably received within the first sleeve when the alignment ridge is aligned with the alignment track.
9. The tool according to claim 1 wherein the first sleeve distal end comprises an alignment member adapted to engage an alignment feature in the housing of a pedicle screw.
10. The tool according to claim 9 wherein the alignment member comprises an alignment dimple.
11. The tool according to claim 1 wherein the second sleeve distal end comprises an alignment portion adapted to engage corresponding alignment points on a housing of a polyaxial screw.
12. The tool according to claim 11 wherein the alignment portion comprises at least one pin member adapted to engage a detent in the housing.
13. The tool according to claim 11 wherein the alignment portion is adapted to engage a protrusion on the housing extending.
14. The tool according to claim 1 wherein the first and second sleeve distal ends are adapted to engage the housing of a polyaxial screw, and wherein the first sleeve is restricted from rotational and axial movement relative to the housing when the at least one protrusion is disposed in the corresponding at least one channel.
15. A tool for facilitating minimally invasive surgical procedures, the tool comprising:
a first elongate sleeve having inner and outer surfaces, a proximal end and a distal end, the inner surface defining a first diameter, the inner surface having a protrusion extending therefrom proximate the distal end, at least a first mating surface proximate the distal end of the first elongate sleeve adapted to engage a corresponding mating surface in a spinal implant;
a second elongate sleeve having inner and outer surfaces, a proximal end and a distal end, the outer surface defining a second diameter smaller than the first diameter, the outer surface having a channel adapted to receive the protrusion when the second sleeve is slidably disposed within the first sleeve, at least an alignment portion proximate the distal end of the second elongate sleeve adapted to engage a corresponding alignment portion in the spinal implant;
wherein the at least one protrusion and the at feast one channel are configured to selectively lock with one another;
an alignment member coupled to the first elongate sleeve inner surface and adapted to be received within an alignment track disposed in the second elongate sleeve outer surface, the alignment member and alignment track positioned to allow the second elongate sleeve to be slidably received within the first elongate sleeve in an orientation which generally aligns the protrusion with the channel.
16. The tool according to claim 15 wherein the elasticity and rotational movement of the distal ends of the first and second sleeves is restricted when the protrusion is disposed in the channel.
17. The tool according to claim 16 wherein the protrusion extends from the first sleeve with a narrow portion widening to a bulbously-shaped head.
18. The tool according to claim 15 further comprising a pedicle screw having an elongate threaded member and a head adapted to cooperatively engage the housing member that is adapted to receive a rod.
19. The tool according to claim 15 wherein the the first mating surface at the distal end of first sleeve is adapted to couple to an outer surface of the housing, and the alignment portion at the distal end of the second sleeve is adapted to couple to an upper edge of the housing, when the protrusion is disposed within the channel.
20. A tool for facilitating minimally invasive surgical procedures, the tool comprising:
a first elongate sleeve having inner and outer surfaces, a proximal end and a distal end, the inner surface defining a first diameter, the inner surface having a protrusion extending therefrom proximate the distal end;
a second elongate sleeve having inner and outer surfaces, a proximal end and a distal end, the outer surface defining a second diameter smaller than the first diameter, the outer surface having a channel adapted to receive the protrusion when the second sleeve is slidably disposed within the first sleeve;
an alignment member coupled to the first elongate sleeve inner surface and adapted to be received within an alignment track disposed in the second elongate sleeve, the alignment member and alignment track positioned to allow the second elongate sleeve to be slidably received within the first elongate sleeve in an orientation which generally aligns the protrusion with the channel, wherein the at least one protrusion and the at least one channel are configured to selectively lock with one another; and
a first mating surface proximate the distal end of the first elongate sleeve and a second mating surface proximate the distal end of the second elongate sleeve, wherein the first and second mating surfaces are adapted to engage a spinal implant to releasably secure the first and second sleeves to the spinal implant.
21. The tool as in claim 20 wherein the protrusion extends radially inward from the first sleeve inner surface.
22. The tool as in claim 20 wherein the alignment track comprises an elongated slot extending from the distal end of the second sleeve towards the proximal end of the second sleeve.
23. The tool as in claim 22 wherein the elongated slot has a length greater than one-half the length of the second sleeve.
24. The tool as in claim 22 wherein the first sleeve comprises an elongated slot that extends from the first sleeve distal end towards the first sleeve proximal end, and wherein the first sleeve elongated slot is generally aligned with the second sleeve elongated slot when the second sleeve and first sleeve are selectively locked together.
25. The tool as in claim 20 wherein the spinal implant comprises a pedicle screw, and wherein the first and second sleeve are adapted to engage a housing portion of the pedicle screw.
26. The tool as in claim 25 wherein the housing portion of the pedicle screw is adapted to receive an elongated rod.
27. The tool as in claim 25 wherein the first sleeve distal end is adapted to engage a first surface of the housing portion and the second sleeve distal end is adapted to engage a second surface of the housing portion to releasably secure the first and second sleeves to the housing portion.
28. The tool as in claim 20 wherein the first sleeve further comprises a second protrusion and the second sleeve further comprises a second channel, and wherein the second protusion and second channel are configured to selectively lock with one another.