Spinal implant revision device

Patent metadata

Field	Value
Publication number	US-9451994-B1
Application number	US-201514755340-A
Country	US
Kind code	B1
Filing date	Jun 30, 2015
Priority date	Jun 19, 2015
Publication date	Sep 27, 2016
Grant date	Sep 27, 2016

Abstract

A spinal implant revision device has a revision connector and a tulip member. The revision connector is configured for attachment to a pre-existing rod in a patient. The revision connector has a slotted opening configured to receive a first or a pre-existing rod. The tulip member is pivotally connected to the revision connector and movable in angularity within predetermined ranges in a first plane. This first plane is parallel to a rod to which the revision connector is attached. A second plane which is non-parallel to that first plane allows a second or new rod to be received in the tulip and allows the second rod to pivot relative to the first rod.

First claim

What is claimed is:

1. A spinal implant revision device comprising:
a revision connector for attachment to a pre-existing rod in a patient, the revision connector having a slotted opening configured to receive a first or a pre-existing rod; and
a tulip member pivotally connected to the revision connector and movable in angularity within predetermined ranges in a first plane, the first plane being parallel to a rod to which the revision connector is attached, the tulip configured to receive a second or new rod wherein the tulip member can rotate within the first plane in a predetermined angular range α− to α+, wherein the angular range of α− to α+ is between −15 degrees to 15 degrees wherein 0 degrees is parallel to a longitudinal axis of the pre-existing rod, the range of angles α− to α+ allows the second or new rod to be tilted either upwardly or downwardly relative to the first or pre-existing rod to permit installation at different levels relative to the spine, and wherein the tulip member has a lower rod receiving portion and an elongated detachable tower portion connected integral to the lower rod receiving portion by a breakaway groove positioned therebetween, the lower rod receiving portion of the tulip is formed as a second or new rod receiving slot or channel extending to a closed end, a pair of legs extend from the closed end defining the second or new rod receiving slot or channel to the breakaway groove, the elongated detachable tower portion has a pair of detachable leg extensions, one leg extension extending from the breakaway groove and aligned with one of the legs further extending the receiving slot or channel toward a proximal end wherein the second or new rod receiving slot or channel extends open through and between legs and leg extension to receive the second or new rod therethrough external of a patient and configured to deliver said rod internal an incision to the closed end of the tulip, and wherein the tulip has a side with a projection interposed between the connector and the inner surface of the connector, the projection fits into a complimentary truncated “V” shaped recessed slot configured to limit the angularity of the connector relative to the tulip within the predetermined range α− to α+ when the tulip and revision connector are assembled the tulip can pivot limited by the projection abutting sides of the truncated “V” shaped recessed slot.

2. The spinal implant revision device of claim 1 wherein a second plane lies transverse to the first rod and allows the revision connector and tulip member to bend within a predetermined angle range θ to θ+ on assembly relative to the first or pre-existing rod and the second or new rod.

3. The spinal implant revision device of claim 2 wherein the angular range within the second plane is θ− to θ+ between −15 degrees and 15 degrees wherein 0 degrees is perpendicular to the first or pre-existing rod, the range of angles θ− to θ+ allows the new second rod to be angled relative to the first or pre-existing rod inward or outward relative to the first or pre-existing rod to permit installation directionally within the second plane toward or away from a centerline of a spine.

4. The spinal implant revision device of claim 1 wherein the leg extensions and the legs have internal threads to receive a compression screw for securing the second or new rod.

5. The spinal implant revision device of claim 1 wherein at or near the proximal end the leg extensions further comprises a pair of bridge connections spanning the respective channel connecting each leg extension.

6. The spinal implant revision device of claim 1 wherein the tulip comprises a projection configured to limit the angle of angular movement α− to α+, the projection extending between the tulip and the revision connector, the revision connector further comprises a recessed slot to receive the projection and sized larger to permit the range of angularity α− to α+ and θ− to θ+.

7. The spinal implant revision device of claim 1 wherein the revision connector has a shaft extending outwardly for coupling to the tulip member, the tulip member having a first receiving hole for passing a shaft and a second receiving hole for passing an end of the shaft therethrough.

8. The spinal implant revision device of claim 7 wherein the revision connector slotted opening for receiving a first or pre-existing rod extends inwardly toward the tulip member to a closed end, the revision connector having a threaded opening above the slotted opening to receive a threaded set screw with a convex or conical or frustoconical shaped tip, and wherein tightening the set screw directs the tip of the set screw to engage the first or pre-existing rod external surface outward of the rod's longitudinal axis as tightening of the set screw draws the revision connector closed end to move tightly against the first or pre-existing rod securing the first or pre-existing rod between the closed end and the tip of the set screw.

9. The spinal implant revision device of claim 8 wherein the end of the shaft of the revision connector is swedged or flared outwardly to pivotally movably fix the revision connector to the tulip member within the angular range α− to α+ fixed to the projection and the truncated recessed slot.

10. The spinal implant revision device of claim 7 wherein the shaft has a concavity or depression on an upper surface to receive a saddle assembly and the implant device further comprises a two piece saddle, a first lower saddle portion with a bottom “U” shaped opening oriented to fit over the shaft and an upper saddle portion with an upper “U” shaped opening for receiving the second or new rod and wherein the upper saddle portion is movable relative to the lower saddle portion so the second or new rod can be moved within the range of angles θ− to θ+.

11. The spinal implant revision device of claim 10 wherein the upper saddle portion has a convex bottom that passes through the lower saddle portion to the depression on the shaft when a set screw tightens the rod.

Assignees

• Amendia Inc

Inventors

• Whipple Dale
• Tillett Jason Hayes
• Tally William C
• Khajavi Kaveh

Classifications

• A61B17/7049 Primary

  Connectors, not bearing on the vertebrae, for linking longitudinal elements together (A61B17/7055, A61B17/7053, A61B17/7019 take precedence) · CPC title

• A61B17/7043

  with a longitudinal element fixed to one or more transverse elements which connect multiple screws or hooks · CPC title

• A61B17/7002

  Longitudinal elements, e.g. rods · CPC title

• A61B17/7032

  Screws or hooks with U-shaped head or back through which longitudinal rods pass · CPC title

• A61B17/705

  for linking adjacent ends of longitudinal elements · CPC title