Interbody fusion grafts and instrumentation
First Claim
Patent Images
1. A spinal fusion implant, comprising:
- a bone portion having an upper bone engaging surface, a lower bone engaging surface, a first sidewall and an opposite second sidewall extending between said upper and lower bone engaging surfaces, said first sidewall having a portion defined by a concave surface.
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Accused Products
Abstract
This invention relates to implants formed from donor bone for use in lumbar interbody fusion procedures and instruments for performing such procedures. The implants are formed to include a concave surface formed from a portion of the medullary canal of a long bone. The concave surface defines a recess in the implant that serves as a depot for osteogenic material. Specific instruments for inserting the implants prepared according to this invention and for preparing the intervertebral space to receive the implants are also provided.
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Citations
62 Claims
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1. A spinal fusion implant, comprising:
a bone portion having an upper bone engaging surface, a lower bone engaging surface, a first sidewall and an opposite second sidewall extending between said upper and lower bone engaging surfaces, said first sidewall having a portion defined by a concave surface. - View Dependent Claims (2, 3, 4)
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5. A spinal fusion implant formed from bone, the implant comprising
a first end adapted to receive an implant tool, the first end having at least one tool engaging recess provided for mating engagement with a projection on an implant insertion tool; -
a second end distal from the first end; and
an elongated body disposed between said first and second ends and defining a longitudinal axis along a length of the implant and wherein the body is provided with a concave surface wherein at least a portion of the concave surface approximates a section of the medullary canal from a long bone. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A spinal fusion implant for positioning within a cavity in an intervertebral space defined by the inferior surface of a first vertebra and an opposing superior surface of an adjacent second vertebrae, wherein the implant is formed from a portion of a diaphysis of a long bone having a medullary canal, said implant comprising:
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a first end adapted for engaging an implant holder the first end having at least one tool engaging recess provided for matingly engagement of a projection on an implant tool, a second end distal from the first end; and
an elongated body disposed between the first and second ends and defining a longitudinal axis along a length of the implant and wherein the body is provided with an upper bone engaging surface, a lower bone engaging surface, and a concave surface extending between said upper and lower bone engaging surfaces, wherein at least a portion of the concave surface is formed from a section of the medullary canal from the long bone. - View Dependent Claims (33)
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34. An implant holder for releasably securing a spinal fusion implant, the holder comprising:
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a shaft defining a proximal end and an opposite distal end with a longitudinal axis extending between said proximal and distal ends, said shaft including an upper branch, a lower branch and a channel therebetween; and
a gripping head attached to said distal end, said gripping head including an upper branch extension attached to the upper branch, a lower branch extension attached to the lower branch, wherein the lower branch extension includes an impacting first surface and a second surface abutting the first surface and positioned to lie substantially parallel to the longitudinal axis and wherein the upper branch extension includes an impacting third surface and a fourth surface extending distally beyond said lower branch extension and adapted to matingly engage one side of a secured implant; and
a closure device movably mounted on said shaft, said closure device movable between a holding position urging said upper and lower branches together and a released position allowing movement of said upper and lower branches. - View Dependent Claims (35, 36, 37, 39, 43)
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38. An implant holder for releasably securing a spinal fusion implant, the holder comprising:
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a shaft defining a longitudinal axis and having a proximal end and an opposite distal end;
a gripping head attached to the distal end of the shaft, the gripping head provided with an impacting first surface positioned to lie substantially perpendicular to the longitudinal direction and a second surface abutting the first surface and substantially perpendicular to the first surface, the second surface adapted for controlling lateral motion of a secured implant; and
a pin extending from the first surface substantially parallel to the longitudinal axis. - View Dependent Claims (40, 41, 42, 44, 45)
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46. A chisel for cutting tissue from a first inferior surface of a first vertebrae and an opposing second superior surface of a second vertebrae adjacent to the first vertebrae, the chisel comprising:
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a shaft; and
a cutting head mounted on the second end of the shaft, the cutting head including a first non-cutting edge attached to a first arm, a second non-cutting edge attached to an opposite second arm and a first cutting blade and a second cutting blade disposed between said first and second arms wherein said first non-cutting edge and said second non-cutting edge extend distally beyond said first and second cutting blades, thereby contacting the first and second surfaces to guide the first and second cutting blades. - View Dependent Claims (47, 48, 49, 56, 57)
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50. A nerve retractor assembly for manipulation of the spinal neurostructure, the assembly comprising,
a retractor blade; a retractor body adapted for unobstructed view of the retracted area wherein the retractor body is provided with a channel adapted to receive the retractor blade. - View Dependent Claims (51, 52, 53, 54)
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55. A nerve retractor assembly for manipulation of the spinal neurostructure, the assembly comprising:
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a retractor body adopted for undistracted view of the retracted area, the retractor body including at least one supporting member mounted thereon for attaching a retractor pin, and at least one retractor pin attached to the supporting member.
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- 58. A method of preparing a implant for a posterior lumbar interbody fusion, the method comprising forming an implant having a substantially elongated body from a bone remnant left from the manufacture of a bone dowel from a long bone.
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60. A round scraper for removal of tissue, the round scraper defining a longitudinal axis and comprising:
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a first arm extending substantially parallel to the longitudinal axis, a second arm spaced from the first arm and extending substantially parallel to the longitudinal wherein the first arm and the second arm define a cavity therebetween, and a tip disposed between the first arm and the second arm wherein the tip includes a first upper cutting edge and a second lower cutting edge and a curved surface disposed between the first cutting edge and the second cutting edge. - View Dependent Claims (61)
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62. A bone graft loader for depositing osteogenic material in an intervertebral space, the bone graft loader comprising:
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a body surrounding a hollow shaft wherein the body includes a first wall and a second wall, the second wall including an opening into the shaft, a pivot plate pivotally mounted within the shaft and having a surface proximal to the opening wherein the surface is adapted for receipt of osteogenic material, and a plunger slidably received with the shaft and disposed between the pivot plate and the first wall.
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Specification