Systems and methods for percutaneous spinal fusion

Patent metadata

Field	Value
Publication number	US-9510875-B2
Application number	US-201414206431-A
Country	US
Kind code	B2
Filing date	Mar 12, 2014
Priority date	Mar 14, 2013
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

A system for percutaneous spinal fusion may include two spaced apart blades connected together by a coupling such that the blades define a percutaneous pathway from a skin incision to an implanted pedicle fastener. The coupling may be c-shaped and may have at least one flexible tab for engaging one or more holes along the length of the blades. If one of the blades becomes disconnected from the pedicle fastener, a supplemental access device may be provided comprising a tubular body having a channel therein for receiving the other of the blades. If both of the blades become disconnected, a supplemental access device may be provided comprising a gripping member received within a locking member. The gripping member may have two legs engageable with the pedicle fastener, and the locking member may move along the gripping member to prevent the legs from disengaging the pedicle fastener.

First claim

The invention claimed is:

1. An access device for percutaneously accessing a pedicle fastener connected to a vertebra of a patient, the access device comprising:
an elongate gripping member including a body portion, a first leg, and a second leg, the first and second legs each having a proximal portion connected to the body portion and a distal portion for engagement with a head of a pedicle fastener, the distal portion of the first leg including a first prong and a second prong, and the distal portion of the second leg including a third prong and a fourth prong, the first and second prongs having a first longitudinal slot therebetween permitting the first and second prongs to spread apart from one another, and the third and fourth prongs having a second longitudinal slot therebetween permitting the third and fourth prongs to spread apart from one another, wherein the distal portions of the first and second legs are deflectable away from one another to engage and disengage the head of the pedicle fastener, and wherein the first and second legs of the gripping member define a first pass-through slot therebetween, the first pass-through slot adapted to receive a spinal fusion rod therethrough; and
an elongate locking member connected to and movable relative to the gripping member between a retracted position and a locked position, wherein the locking member prevents the first and second legs of the gripping member from deflecting away from one another when in the locked position;
wherein the access device includes at least one projection arranged within the first slot, and wherein the projection is adapted to move along the first slot to cause the first and second prongs to spread apart from one another.

2. The access device of claim 1 , wherein the projection is connected to the locking member, and wherein movement of the locking member to the retracted position causes the projection to move along the first slot so as to deflect the first and second prongs away from one another.

3. The access device of claim 1 , further comprising at least one tab arranged to be received within a recess in the gripping member, wherein movement of the locking member to the locked position causes the tab to move into the recess.

4. The access device of claim 3 , wherein the elongate locking member has a first extension aligned along the first leg and a second extension aligned along the second leg, and wherein the first and second extensions of the locking member prevent the respective first and second legs of the gripping member from deflecting away from one another when in the locked position, and wherein the tab is located at a distal end of the first extension.

5. The access device of claim 4 , wherein the tab extends in a distal direction from the distal end of the first extension.

6. The access device of claim 5 , wherein the recess extends distally within a ledge, the ledge protruding outwardly from an outer surface of the first leg.

7. The access device of claim 3 , wherein engagement of the tab within the recess restrains movement of the first and second prongs away from one another.

8. The access device of claim 7 , wherein the recess is located on one of the first and second prongs.

9. The access device of claim 1 , wherein the gripping member is received within the locking member.

10. The access device of claim 9 , wherein the gripping member has a tubular shape defining a longitudinal pathway therein along a central longitudinal axis of the access device.

11. The access device of claim 1 , wherein the locking member is movable along a central longitudinal axis of the access device relative to the gripping member between the retracted and locked positions.

12. The access device of claim 11 , further comprising an actuation mechanism for actuating movement of the locking member relative to the gripping member along the central longitudinal axis between the retracted and locked positions, wherein the actuation mechanism is adapted to actuate the movement of the locking member relative to the gripping member in response to rotation of the actuation mechanism.

13. The access device of claim 12 , wherein the rotation of the actuation mechanism is about the central longitudinal axis of the access device.

14. The access device of claim 12 , wherein the rotation of the actuation mechanism is along a threaded connection.

15. The access device of claim 1 , wherein the elongate locking member has a first extension aligned along the first leg and a second extension aligned along the second leg, and wherein the first and second extensions of the locking member prevent the respective first and second legs of the gripping member from deflecting away from one another when in the locked position.

16. The access device of claim 15 , wherein the first and second extensions of the locking member define a second pass-through slot therebetween, the second pass-through slot adapted to receive the spinal fusion rod therethrough, and wherein the first and second pass-through slots are aligned with one another about a central longitudinal axis of the access device.

17. A percutaneous spinal fusion system comprising:
the access device of claim 1 ; and
the pedicle fastener, wherein the pedicle fastener includes a first blade and a second blade detachably connected thereto, the first and second blades each having a plurality of holes spaced apart along a length of the respective blades.

18. A system for percutaneously accessing a pedicle fastener connected to a vertebra of a patient, the pedicle fastener having a head defining a receptacle for receiving a spinal fixation rod therein, and the pedicle fastener having two blades detachably connected to the head, comprising:
the access device of claim 1 , for use when both of the blades become detached from the head; and
a second access device for use when one of the blades becomes detached from the head, leaving a remaining blade, the second access device including an elongate body having a distal end for engagement with the head of the pedicle fastener, the body defining a longitudinal bore therein along a central longitudinal axis of the body, and the body including a groove therein extending longitudinally along the bore, the groove dimensioned to receive the remaining blade of the pedicle fastener therein.

19. An access device for percutaneously accessing a pedicle fastener connected to a vertebra of a patient, the access device comprising:
an elongate gripping member including a body portion, a first leg, and a second leg, the first and second legs each having a proximal portion connected to the body portion and a distal portion for engagement with a head of a pedicle fastener, the distal portion of the first leg including a first prong and a second prong, and the distal portion of the second leg including a third prong and a fourth prong, the first and second prongs having a first longitudinal slot therebetween permitting the first and second prongs to deflect relative to each other, and the third and fourth prongs having a second longitudinal slot therebetween permitting the third and fourth prongs to deflect relative to each other, wherein the distal portions of the first and second legs are deflectable away from one another to engage and disengage the head of the pedicle fastener; and
an elongate locking member connected to and movable relative to the gripping member between a retracted position and a locked position, wherein the locking member prevents the first and second legs of the gripping member from deflecting away fro

Assignees

• Stryker Spine
• Stryker European Holdings I Llc

Inventors

• Reitblat Abram
• Stein Joshua
• Sharifi-Mehr Amir Ali

Classifications

• A61B17/7074

  Tools specially adapted for spinal fixation operations other than for bone removal or filler handling (A61B17/7062, A61B17/808, A61B17/8858 take precedence; for spinal image producing devices A61B90/36, A61B34/20; markers A61B90/39) · CPC title

• A61B17/708

  with tubular extensions coaxially mounted on the bone anchors · CPC title

• A61B17/7091

  for applying, tightening or removing longitudinal element-to-bone anchor locking elements, e.g. caps, set screws, nuts or wedges · CPC title

• A61B17/7085 Primary

  for insertion of a longitudinal element down one or more hollow screw or hook extensions, i.e. at least a part of the element within an extension has a component of movement parallel to the extension's axis · CPC title

• A61B17/7083

  Tools for guidance or insertion of tethers, rod-to-anchor connectors, rod-to-rod connectors, or longitudinal elements · CPC title