Vertebral joint implants and delivery tools

• US 8,753,345 B2
• Filed: 09/26/2012
• Issued: 06/17/2014
• Est. Priority Date: 06/06/2008
• Status: Active Grant

• Current Assignee: Providence Medical Technology, Inc.
• Original Assignee: Providence Medical Technology, Inc.
• Inventors: McCormack, Bruce M., Smith, Jeffrey D., Tanaka, Shigeru, Liou, Edward, Eyster, Edward Fletcher, Carver, Jonathan, Druker, Joshua, Leugers, Martin, Tu, Kurin, Lombrozo, Peter
• Primary Examiner(s): Ramana, Anu
• Application Number:
  US13/627,865
• Publication Number:
  US 20130030440A1
• Time in Patent Office: 629 Days
• Field of Search: 606/86.R, 606/90, 606/99, 606/104, 606/105, 606/79, 606/80, 606/82, 606/84, 606/85, 623 1711- 1716
• US Class Current: 606/79
• CPC Class Codes: A61B 17/025 Joint distractors
• CPC Class Codes: A61B 17/0642 for bones, e.g. for osteosynthesis or connecting tendon to bone
• CPC Class Codes: A61B 17/1604 Chisels; Rongeurs; Punches; Stamps
• CPC Class Codes: A61B 17/1659 Surgical rasps, files, planes, or scrapers
• CPC Class Codes: A61B 17/1671 for the spine
• CPC Class Codes: A61B 17/1735 for rasps or chisels
• CPC Class Codes: A61B 17/1757 for the spine
• CPC Class Codes: A61B 17/7064 Devices acting on, attached to, or simulating the effect of, vertebral facets; Tools therefor
• CPC Class Codes: A61B 17/7074 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 Class Codes: A61B 17/863 with thread interrupted or changing its form along shank, other than constant taper
• CPC Class Codes: A61B 17/8811 characterised by the introducer tip, i.e. the part inserted into or onto the bone
• CPC Class Codes: A61B 17/8819 characterised by the introducer proximal part, e.g. cannula handle, or by parts which are inserted inside each other, e.g. stylet and cannula A61B17/8825 takes precedence
• CPC Class Codes: A61B 17/8822 characterised by means facilitating expulsion of fluid from the introducer, e.g. a screw pump plunger, hydraulic force transmissions, application of vibrations or a vacuum
• CPC Class Codes: A61B 2017/00424 ergonomic, e.g. fitting in fist
• CPC Class Codes: A61B 2017/00429 with a roughened portion
• CPC Class Codes: A61B 2017/0256 for the spine
• CPC Class Codes: A61B 2017/320028 with reciprocating movements
• CPC Class Codes: A61B 2090/031 torque limiting
• CPC Class Codes: A61B 2090/034 abutting on parts of the device itself
• CPC Class Codes: A61B 2090/037 with a frangible part, e.g. by reduced diameter
• CPC Class Codes: A61F 2/4405 : for apophyseal or facet joints, i.e. between adjacent spinous or transverse processes devices implanted between spinous or transverse processes A61B17/7062
• CPC Class Codes: A61F 2/4455 : for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages intervertebral discs A61F2/442
• CPC Class Codes: A61F 2/447 : substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section
• CPC Class Codes: A61F 2/4611 : of spinal prostheses
• CPC Class Codes: A61F 2002/30131 : horseshoe- or crescent- or C-shaped or U-shaped
• CPC Class Codes: A61F 2002/30168 : L-shaped
• CPC Class Codes: A61F 2002/30176 : V-shaped
• CPC Class Codes: A61F 2002/30266 : wedge-shaped parallelepipeds
• CPC Class Codes: A61F 2002/30289 : helically-coiled
• CPC Class Codes: A61F 2002/30378 : Spherically-shaped protrusion and recess
• CPC Class Codes: A61F 2002/30405 : made by screwing complementary threads machined on the parts themselves
• CPC Class Codes: A61F 2002/30451 : soldered or brazed or welded
• CPC Class Codes: A61F 2002/30471 : connected by a hinged linkage mechanism, e.g. of the single-bar or multi-bar linkage type
• CPC Class Codes: A61F 2002/30484 : Mechanically expandable devices located on the first prosthetic part for locking into or onto the second prosthetic part
• CPC Class Codes: A61F 2002/30507 : using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/3052 : unrestrained in only one direction, e.g. moving unidirectionally
• CPC Class Codes: A61F 2002/30523 : by means of meshing gear teeth
• CPC Class Codes: A61F 2002/30538 : for adjusting angular orientation
• CPC Class Codes: A61F 2002/30556 : for adjusting thickness
• CPC Class Codes: A61F 2002/30599 : stackable
• CPC Class Codes: A61F 2002/30733 : Inserts placed into an endoprosthetic cavity, e.g. for modifying a material property
• CPC Class Codes: A61F 2002/30841 : Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/3085 : with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
• CPC Class Codes: A61F 2002/30904 : serrated profile, i.e. saw-toothed
• CPC Class Codes: A61F 2002/448 : comprising multiple adjacent spinal implants within the same intervertebral space or within the same vertebra, e.g. comprising two adjacent spinal implants
• CPC Class Codes: A61F 2002/4627 : with linear motion along or rotating motion about the instrument axis or the implantation direction, e.g. telescopic, along a guiding rod, screwing inside the instrument
• CPC Class Codes: H04L 45/00 : Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/02 : Topology update or discovery
• CPC Class Codes: H04L 45/22 : Alternate routing
• CPC Class Codes: H04L 45/28 : using route fault recovery
• CPC Class Codes: H04W 28/04 : Error control

Abstract

A spinal joint distraction system for treating a facet joint including articular surfaces having a contour is disclosed and may include a delivery device including a generally tubular structure adapted to engage a facet joint, an implant adapted to be delivered through the delivery device and into the facet joint, the implant comprising two members arranged in opposed position, and an implant distractor comprising a generally elongate member adapted to advance between the two members of the implant causing separation of the members and distraction of the facet joint, wherein the implant is adapted to conform to the shape of the implant distractor and/or the articular surfaces of the facet upon being delivered to the facet joint. Several embodiments of a system, several embodiments of an implant, and several methods are disclosed including a method for interbody fusion.

Claims

1. A minimally invasive system for preparing tissue associated with a spinal facet joint space targeted for receiving an implant, the spinal facet joint space including a superior facet joint surface and an inferior facet joint surface, the spinal facet joint space opening in a posterior direction immediately adjacent a superior lateral mass and an inferior lateral mass, the system comprising:

a decorticator comprising a proximal portion, a distal portion opposite the proximal portion and a hollow body extending between the proximal and distal portions, the distal portion distally terminating in a decorticating surface comprising at least one of an abrasive surface or a plurality of teeth; and

a guide tool comprising a proximal region, a distal region opposite the proximal region and an elongated member extending between the proximal and distal regions, the distal region including a first chamfered tip,

wherein the decorticator and guide tool are each further configured such that, when the first chamfered tip is positioned in the spinal facet joint space between the superior and inferior facet joint surfaces and the elongated member of the guide tool extends through the hollow body of the decorticator, the decorticator can be rotated about a longitudinal axis of the elongated member and the decorticating surface brought into decorticating contact with at least one of the superior lateral mass or the inferior lateral mass.

2. The system of claim 1, wherein the distal portion of the decorticator terminates at a sloped angle relative to a longitudinal axis of the hollow body.

3. The system of claim 2, wherein the sloped angle defines a chamfered tip.

4. The system of claim 2, wherein, when the decorticator is rotated about the elongated member in a first orientation, the sloped angle allows the decorticating surface to contact the superior lateral mass without contacting the inferior lateral mass, and, when the decorticator is rotated about the elongated member in a second orientation opposite the first orientation, the sloped angle allows the decorticating surface to contact the inferior lateral mass without contacting the superior lateral mass.

5. The system of claim 2, wherein the sloped angle is between approximately 10 degrees to approximately 80 degrees relative to the longitudinal axis of the hollow body.

6. The system of claim 2, wherein the sloped angle is between approximately 30 degrees to approximately 60 degrees relative to the longitudinal axis of the hollow body.

7. The system of claim 2, wherein the sloped angle is approximately 45 degrees relative to the longitudinal axis of the hollow body.

8. The system of claim 1, wherein an inner diameter of the hollow body of the decorticator is substantially equal to an outer diameter of the elongated member and a difference between the inner diameter and the outer diameter is such that the hollow body can slide over and rotate about the elongated member.

9. The system of claim 1, wherein the first chamfered tip comprises a first fork and a second fork offset from the first fork by a distance measured transverse to a longitudinal axis of the elongated member.

10. The system of claim 9, wherein the first fork distally tapers towards a distal point.

11. The system of claim 1, wherein the elongated member comprises a lumen extending between the proximal and distal regions.

12. The system of claim 11, wherein the first chamfered tip comprises a first fork and a second fork offset from the first fork by a distance transverse to a longitudinal axis of the elongated member, the system further comprising:

a rasp comprising a proximal aspect, a distal aspect opposite the proximal aspect and a shaft extending between the proximal and distal aspects, the distal aspect distally terminating in a second chamfered tip including a rasp configuration comprising a planar surface with a series of raised features,

wherein the rasp and guide tool are further configured such that, when the first chamfered tip is positioned in the spinal facet joint space between the superior and inferior facet joint surfaces and the shaft of the rasp extends through the lumen of the guide tool such that the rasp configuration is positioned in the spinal facet joint space, the second chamfered tip is positioned between the first and second forks.

13. The system of claim 12, wherein the rasp can be longitudinally displaced within the lumen to cause the series of raised features to rasp against at least one of the inferior facet joint surface or the superior facet joint surface.

14. The system of claim 12, wherein a longitudinal cross section of the second chamfered tip is generally similar to a longitudinal cross section of the first chamfered tip.

15. The system of claim 14, wherein the first chamfered tip and second chamfered tip are both double chamfered.

16. The system of claim 12, wherein an inner diameter of the lumen of the guide tool is substantially equal to an outer diameter of the shaft and a difference between the inner diameter and the outer diameter is such that the shaft can slide through the lumen.

17. The system of claim 16, wherein the proximal aspect of the rasp includes a first structure and the proximal region of the guide tool includes a second structure configured to matingly engage with the first structure, such that, when the first and second structures are matingly engaged, the longitudinal cross section of the first chamfered tip is generally aligned with the longitudinal cross section of the second chamfered.

18. The system of claim 12, wherein the series of raised features comprises ridges in a chevron rasp pattern.

19. The system of claim 12, wherein the second chamfered tip and the first chamfered tip both comprise complementary transverse holes that generally align when the second chamfered tip and first chamfered tip are generally aligned to generally form a combined chamfered tip, the transverse hole of the second chamfered tip including an axis that is transverse to a longitudinal axis of the shaft of the rasp, the transverse hole of the first chamfered tip including an axis that is transverse to the longitudinal axis of the elongated member.