Direct vertebral rotation tool and method of using same
View Patent ↗A head holder for holding and tensioning the head of a bone screw, particularly a pedicle screw, is provided. Also provided is a ratcheting connector for connecting to the head holders while permitting rotational movement of the head holder when engaged with the ratcheting connector. Also provided is a flex arm connector for connecting multiple ratcheting connectors across multiple vertebral bodies. A tool set for managing and/or correcting spinal deformities, such as scoliosis, including at least one or more head holders and one or more ratcheting connectors is provided.
1. A vertebral rotation tool comprising:
a head holder comprising:
a handle portion having a generally tubular shape, a distal end and a proximal end;
an inner sheath having a tubular proximal end and a distal end having two U-shaped cutouts, two arc-shaped head clamp portions adapted to receive a head of a pedicle screw;
an outer sheath having a distal end and a proximal ring section and a longitudinal axis defined therebetween, the proximal ring section including a locking mechanism that permits the outer sheath to move between and to reside in locked and unlocked positions, wherein the locking mechanism is operable to be depressed substantially perpendicular to the longitudinal axis in the unlocked position, and wherein the tubular proximal end of the inner sheath can be attached to the handle portion and the outer sheath can surround the inner sheath; and
a spring adapted to surround the inner sheath and be positioned between a distal edge of the handle portion and a proximal edge of the outer sheath.
2. The vertebral rotation tool of claim 1 wherein the distal end of the inner sheath is adapted to be releasably connected to the head of the pedicle screw by applying an axial force along a longitudinal axis of the head holder.
3. The vertebral rotation tool of claim 2 wherein the distal end of the inner sheath further comprises pins adapted to releasably connect with a mating feature on the head of the pedicle screw.
4. The vertebral rotation tool of claim 2 wherein the distal end of the outer sheath comprises two opposing U-shaped cutouts adapted to receive a rod and the distal end of the inner sheath.
5. The vertebral rotation tool of claim 1 wherein the outer sheath can be placed into the unlocked position by sliding the outer sheath towards the handle portion along a longitudinal axis of the head holder such that the spring biases the outer sheath towards the distal end of the head holder and wherein the outer sheath can be held in the unlocked position by engaging the locking mechanism.
6. The vertebral rotation tool of claim 5 wherein the outer sheath can be moved from the unlocked position to the locked position by releasing the locking mechanism such that the spring moves the outer sheath in a distal direction over the inner sheath.
7. The vertebral rotation tool of claim 1 wherein the locking mechanism comprises a spring-loaded locking ring and a locking button;
wherein the spring-loaded locking ring is adapted to receive the distal end of the handle portion and engage with one of a proximal groove formed on an outer surface of the handle portion or a distal groove formed on the outer surface of the handle portion; and
wherein when the spring-loaded locking ring is engaged with the distal groove on the handle portion, the outer sheath is placed in the unlocked position and when the spring-loaded locking ring is engaged with the proximal groove on the handle portion, the outer sheath is placed in the locked position.
8. The vertebral rotation tool of claim 7 wherein the spring-loaded locking ring can be disengaged from the unlocked position by pressing the locking button.
9. The vertebral rotation tool of claim 1 further comprising:
a ratcheting connector comprising:
a first arm comprising a first inner section and a first outer section, the first outer section comprising a first adjustable circular sleeve;
a first rotatable bearing adapted to be rotatably mounted within the first adjustable circular sleeve;
a first mechanism adapted to lock the first adjustable circular sleeve around the first rotatable bearing;
a second arm comprising a second inner section and a second outer section, the second outer section comprising a second adjustable circular sleeve and a receptacle having an opening;
a second rotatable bearing adapted to be rotatably mounted within the second adjustable circular sleeve;
a second mechanism adapted to lock the second adjustable circular sleeve around the second rotatable bearing;
wherein the first and second inner sections are adapted to be slidably connected to each other to permit adjustment of a distance between the first and second adjustable circular sleeves.
10. The vertebral rotation tool of claim 9 wherein the first and second inner sections have substantially rectangular cross-section that can be slidably mounted to each other.
11. The vertebral rotation tool of claim 10 wherein the first and second inner sections have a substantially flat profile.
12. The vertebral rotation tool of claim 10 wherein the first and section inner sections have a substantially curved profile.
13. The vertebral rotation tool of claim 9 wherein a bottom surface of the first inner section comprises a toothed surface and a bottom surface of the second inner section comprises at least one pin adapted to engage with one or more recesses of the toothed surface to lock a position of the first arm with respect to the second arm.
14. The vertebral rotation tool of claim 9 wherein the ratcheting connector further comprises a receptacle placed on an upper surface of the ratcheting connector that can receive and releasably lock an installation tool.
15. The vertebral rotation tool of claim 14 , wherein the installation tool is a rotation handle adapted to apply a rotational force to the ratcheting connector.
16. The vertebral rotation tool of claim 14 , wherein the installation tool is a flex arm connector comprising:
a plurality of nesting cups, each cup having a female portion and a male portion such that the male portion nests within the female portion, the plurality of nesting cups forming a flexible length;
a mechanism for locking the flex arm connector into a desired configuration attached to one end of the flexible length; and
at least one adjustable sleeve adapted to be slidably mounted on the flexible length, each adjustable sleeve including a mechanism to lock the sleeve at a location on the flexible length, each sleeve further including a swivel post configured to interlock with the receptacle.
17. The vertebral rotation tool of claim 16 wherein the at least one adjustable sleeve further comprises a receptacle having an opening, the receptacle located opposite the swivel post.
18. A vertebral rotation tool comprising:
a head holder comprising:
a handle portion having a generally tubular shape, a distal end and a proximal end;
an inner sheath having a tubular proximal end and a distal end having two U-shaped cutouts, two arc-shaped head clamp portions adapted to receive a head of a pedicle screw;
an outer sheath having a distal end and a proximal ring section and a longitudinal axis defined therebetween, the proximal ring section including a locking mechanism that permits the outer sheath to move between and to reside in locked and unlocked positions, wherein the locking mechanism is operable to be depressed substantially perpendicular to the longitudinal axis in the unlocked position, and wherein the tubular proximal end of the inner sheath can be attached to the handle portion and the outer sheath can surround the inner sheath;
wherein the distal end of the inner sheath is adapted to be releasably connected to the head of the pedicle screw by applying an axial force along a longitudinal axis of the head holder; and
a ratcheting connector comprising:
a first arm comprising a first inner section and a first outer section, the first outer section comprising a first adjustable circular sleeve;
a first rotatable bearing adapted to be rotatably mounted within the first adjustable circular sleeve;
a first mechanism adapted to lock the first adjustable circular sleeve around the first rotatable bearing;
a second arm comprising a second inner section and a second outer section, the second outer section comprising a second adjustable circular sleeve and a receptacle having an opening;
a second rotatable bearing adapted to be rotatably mounted within the second adjustable circular sleeve;
a second mechanism adapted to lock the second adjustable circular sleeve around the second rotatable bearing;
wherein the first and second inner sections are adapted to be slidably connected to each other to permit adjustment of a distance between the first and second adjustable circular sleeves; and
wherein the ratcheting connector further comprises a receptacle placed on an upper surface of the ratcheting connector that can receive and releasably lock an installation tool.
19. The vertebral rotation tool of claim 18 , wherein the installation tool is a rotation handle adapted to apply a rotational force to the ratcheting connector.
20. The vertebral rotation tool of claim 18 , wherein the installation tool is a flex arm connector comprising:
a plurality of nesting cups, each cup having a female portion and a male portion such that the male portion nests within the female portion, the plurality of nesting cups forming a flexible length;
a mechanism for locking the flex arm connector into a desired configuration attached to one end of the flexible length; and
at least one adjustable sleeve adapted to be slidably mounted on the flexible length, each adjustable sleeve including a mechanism to lock the sleeve at a location on the flexible length, each sleeve further including a swivel post configured to interlock with the receptacle.