Spinal correction system and method

Patent metadata

Field	Value
Publication number	US-2016338740-A1
Application number	US-201615225078-A
Country	US
Kind code	A1
Filing date	Aug 1, 2016
Priority date	Jun 13, 2012
Publication date	Nov 24, 2016
Grant date	—

Abstract

A spinal correction apparatus comprises a body. A ratchet is disposed with the body. A longitudinal element is connected to the ratchet. A force is applied to at least a portion of the apparatus that causes dynamic incremental movement of the longitudinal element relative to the body in at least one direction. Methods of use are disclosed.

First claim

1 . A spinal correction apparatus comprising:
a body; a ratchet disposed with the body; and a longitudinal element connected to the ratchet, wherein a force applied to at least a portion of the apparatus causes dynamic incremental movement of the longitudinal element relative to the body in at least one direction.

2 . An apparatus as recited in claim 1 , further comprising an actuator disposed with the body and connected to the ratchet to facilitate incremental movement of the longitudinal element relative to the body in the at least one axial direction, wherein the force includes an expansion force applied to the longitudinal element that causes the dynamic incremental movement of the longitudinal element, independent of the actuator, relative to the body in a first axial direction.

3 - 6 . (canceled)

7 . An apparatus as recited in claim 1 , wherein the longitudinal element is disposed in a telescopic configuration with the body.

8 . An apparatus as recited in claim 2 , wherein the actuator is rotatable in at least one direction to facilitate axial movement of the longitudinal element.

9 . An apparatus as recited in claim 2 , wherein the actuator is rotatable in a first direction and a second direction to facilitate movement of the longitudinal element in the first axial direction.

10 . (canceled)

11 . An apparatus as recited in claim 2 , wherein the actuator defines a socket configured for engagement with an instrument.

12 . An apparatus as recited in claim 1 , wherein the longitudinal element is connected with the ratchet and configured for movement in a first axial direction only.

13 . An apparatus as recited in claim 1 , wherein the longitudinal element is connected with the ratchet and configured for movement in a first axial direction and a second axial direction.

14 . An apparatus as recited in claim 1 , wherein the longitudinal element is connected with the ratchet and configured for movement in a first axial direction such that an overall length of the apparatus increases and a second axial direction such that the overall length of the apparatus decreases.

15 . An apparatus as recited in claim 1 , wherein the ratchet comprises a drive screw and a carriage connected with the longitudinal element, the carriage being engageable with the screw to facilitate axial movement of the longitudinal element.

16 . An apparatus as recited in claim 1 , wherein the ratchet comprises a drive screw and a carriage connected with the longitudinal element, the ratchet further comprising a helical pawl engageable with the carriage to facilitate axial movement of the longitudinal element.

17 . An apparatus as recited in claim 2 , wherein the actuator includes a worm gear engageable with the ratchet.

18 . An apparatus as recited in claim 2 , wherein the actuator includes a worm gear engageable with the ratchet such that the longitudinal element is movable in a first axial direction and a second axial direction.

19 . (canceled)

20 . A spinal correction apparatus comprising:
an outer sleeve extending between a first end and a second end, the outer sleeve including an inner surface that defines an elongated cavity; a ratchet disposed with the cavity of the outer sleeve, the ratchet comprising a drive screw, a carriage and a helical pawl being engageable with the carriage; a rod telescopically oriented with the outer sleeve and connected to the carriage, the rod extending between a first end and a second end; and a worm gear engageable with the screw in a configuration to facilitate incremental movement of the rod relative to the outer sleeve in a first axial direction and a second axial direction, the worm gear defining a socket configured for engagement with an instrument, wherein an expansion force applied to the first end of the rod causes incremental movement of the rod, independent of the worm gear, relative to the outer sleeve in the first axial direction.

21 . An apparatus as recited in claim 1 , wherein the longitudinal element comprises an outer surface that is threaded with a threaded cavity of the ratchet.

22 . An apparatus as recited in claim 1 , wherein the ratchet comprises a drive screw and a carriage connected with the longitudinal element, the drive screw being offset from a longitudinal axis defined by the longitudinal element.

23 . An apparatus as recited in claim 1 , wherein the ratchet comprises a drive screw and a carriage connected with the longitudinal element, the carriage being engageable with the drive screw to facilitate axial movement of the longitudinal element.

24 . An apparatus as recited in claim 1 , further comprising a second longitudinal element that is coaxial with the longitudinal element, the second longitudinal element comprising a threaded outer surface that engages a threaded inner surface of the body.

25 . A spinal correction apparatus comprising:
a sleeve extending between first and second ends, the sleeve including an inner surface that defines a cavity; a ratchet disposed with the cavity and comprising a screw, a carriage and a pawl that is engageable with the carriage; a rod telescopically oriented with the sleeve and connected to the carriage; and a worm gear engageable with the screw in a configuration to facilitate incremental movement of the rod relative to the sleeve in a first axial direction and a second axial direction.

26 . An apparatus as recited in claim 1 , wherein screw is offset from a longitudinal axis defined by the rod.

Assignees

• Warsaw Orthopedic Inc

Inventors

• Kawakami Noriaki
• Askin Geoffrey
• Crawford Haemish
• Lim Roy
• Glaser Adam D

Classifications

• A61B17/7014 Primary

  with means for adjusting the distance between two screws or hooks · CPC title

• A61B17/707

  Devices acting on, or attached to, a transverse process or rib; Tools therefor · CPC title

• A61B17/888

  the driver bit acting on the central region of the screw head · CPC title