Spinal intervertebral implant, interconnections for such implant and processes for making
First Claim
35. A pin for interconnecting a plurality of bone elements in an implant comprising:
- an elongated member having a longitudinal length dimension and comprising cortical bone having a fiber direction, the fiber direction extending in the length dimension, the member having first and second sections which are offset relative to each other in the radial direction transverse to the longitudinal length direction.
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Accused Products
Abstract
A cortical bone implant is formed of two or more planks of bone which are connected with one or more offset pins. The pins may be right circular cylinders inserted into a corresponding offset bore which offset bends the inserted pin. The bending creates compression and tensile loads in the pin which loads creates friction compression forces on the planks connecting them to the pins by friction. The pins may have different shapes to form the offsets and different configurations for friction attachment to the planks. The implants may be formed of flat or L-shaped planks or bones formed into other shapes including interlocking arrangements. Processes and fixtures are disclosed for forming the pins, planks and implants. Various embodiments of the pins, planks, implants and processes are disclosed.
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Citations
138 Claims
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35. A pin for interconnecting a plurality of bone elements in an implant comprising:
an elongated member having a longitudinal length dimension and comprising cortical bone having a fiber direction, the fiber direction extending in the length dimension, the member having first and second sections which are offset relative to each other in the radial direction transverse to the longitudinal length direction. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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58. A spinal implant comprising:
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first and second cortical bone members each having a pin receiving bore at an interface therebetween;
means for resisting translation of the members relative to each other in any given direction; and
a cortical bone pin in the bores for connecting the bone members;
one of the pin and mating bores being offset relative to each other to create a compressive and/or tensile force in the pin to create a static friction load to lock the pin to the bone members in the given direction. - View Dependent Claims (59)
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60. A cortical bone implant comprising:
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a first cortical bone member having a first bore;
a second cortical bone member having a second bore; and
a connecting pin attached to each member in said bores;
means for placing the pin in both compression and tension to frictionally hold the pin to the members and the members together. - View Dependent Claims (61)
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62. A cortical bone implant comprising:
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a first cortical bone member;
a second cortical bone member abutting the first member, each member having a pin receiving bore; and
a pin, the pin being in each member bore for attaching the members to each other, the pin and bores being arranged to place the pin in both compression and tension. - View Dependent Claims (63, 64, 65, 66, 67, 68, 69, 70, 71)
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73. An implant comprising:
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a first planar member having two opposing broad surfaces having a periphery defining a first plurality of edges;
a second L-shaped member having a first base member defined by a second plurality of edges and a first leg extending from the base member at one base member edge forming a first recess, the first member being disposed in the first recess with an edge of the first member abutting the first leg, the edges of the first base member and the edges of the first member being coextensive; and
means for securing the first member to the second member. - View Dependent Claims (74, 75)
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76. An implant comprising:
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a first L-shaped member having a first base portion and a first leg portion;
a second L-shaped member having a second base portion and second leg portion;
a third planar member disposed between the first and second base portions and between the first and second leg portions;
and means for securing the members together. - View Dependent Claims (77, 78, 79)
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80. A spinal implant comprising:
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a stacked plurality of planar cortical bone sheets each with a bore, the implant having a length dimension in a given direction, the sheets each having an abutting interface surface extending in the length direction with the corresponding bore at said interface; and
means including a pin extending transversely the length direction in said bores for securing the sheets together, the bores and pin being arranged so that the pin exhibits compressive and tensile forces for applying a compressive load on at least two of said sheets to hold the sheets together.
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81. A spinal implant comprising:
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a stacked plurality of planar cortical bone sheets, the implant having a length dimension in a given direction, the sheets each having an interface surface abutting an adjacent sheet extending transversely the length direction and a bore at the interface surface; and
a cortical bone pin extending in the length direction in said bores for securing the sheets together. - View Dependent Claims (82)
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83. A spinal implant comprising:
a member of formed of cortical bone, the member having an anterior end defined by an anterior end surface and a posterior end defined by a posterior end surface, the implant having first and second side surfaces terminating at said end surfaces, the side surfaces comprising mirror image continuous curved surfaces. - View Dependent Claims (84, 85, 86)
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87. A cortical bone implant member comprising:
a cortical bone plank defined by opposing sides each having a surface, the plank being surrounded by a peripheral edge, the plank having a fiber direction generally parallel to the opposing side surfaces, the plank have a length dimension and a transverse width dimension smaller than the length dimension, the fiber direction being generally parallel to the width dimension, the plank having at least one through bore in communication with said sides.
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88. A bone implant comprising:
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first and second cortical bone planks each defined by opposing sides each side having a surface and surrounded by a peripheral edge, the planks having a fiber direction generally parallel to the opposing side surfaces, each plank having a length dimension defining a longitudinal direction and a transverse width dimension smaller than the length dimension, the fiber direction being generally parallel to the width dimension, the planks each having at least one through bore in communication with said side surfaces; and
a cortical bone pin in interference fit with each said bores wherein the pin applies a compressive load on the corresponding planks in opposing longitudinal directions.
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89. A method of forming a bone implant comprising:
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assembling two cortical bone planks in parallel abutting relation;
boring at least one first bore in one of the bone planks in a first direction; and
boring at least one second bore in the other of the bone planks in a second direction generally opposite the first direction wherein the first and second bores are offset relative to each an amount such that a straight bone pin inserted in the bores is placed in compression and tension. - View Dependent Claims (90, 91, 92, 93, 94, 95, 96)
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97. A method of forming an implant comprising:
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forming first and second cortical bone planks;
forming a bore in each said planks; and
inserting a bone pin in the bores so as to cause the pin to exhibit both compressive and tensile loads which compressively secure the planks to the pin. - View Dependent Claims (98, 99, 100, 101, 102)
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103. A method of forming a bone implant comprising:
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clamping a bone between first and second clamp members such that an end portion of the bone overhangs an end of the clamp members; and
removing a portion of the overhanging end portion of the bone to form an implant plank.
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104. A method of forming an implant comprising:
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forming a plurality of implant members each defining a plane;
abutting the members; and
attaching a pin to the abutting members transverse to the plane and creating opposing compressive forces against the members by creating compressive and tensile bending loads in the pin to resist forces which otherwise tend to separate the members. - View Dependent Claims (105, 106, 107, 108, 109, 110)
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111. A method of forming an implant comprising:
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forming first and second cortical bone members with a bore in each member;
contracting a cortical bone pin by dehydrating the pin;
inserting the dehydrated pin in the bore of each member; and
thenexpanding the inserted pin to create an interference fit between the pin and bone members in the bores. - View Dependent Claims (1, 2, 3, 4, 5, 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, 32, 33, 34, 112, 113, 114, 115, 116)
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115-1. The implant of claim 114 wherein the means for securing comprises a cortical bone pin in a bore of each plank, the pin having bone fibers extending in the length direction of the pin, a surface of the pin being demineralized.
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117. A cortical bone implant comprising:
first and second mirror image blocks of substantially the same shape and dimensions formed of cortical bone, each block having opposing ends, a projection extending from one end and a slot formed in the other end, the slot of one block receiving the projection of the other block to form an assembled six sided implant.
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118. An implant comprising:
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a body comprising first and second cortical bone members having an oval outer peripheral surface and two opposing planar surfaces at opposite edges of the oval surface; and
mechanical interconnection means for connecting the first and second members. - View Dependent Claims (119, 120, 121)
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122. A bone implant comprising:
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first and second cortical bone members;
each member comprising a segment of a ring of cortical bone and including a plurality of slots, the slots being arranged so that the slots of the first and second members interengage to mechanically secure the members together into a single structure.
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123. A process for forming a bone implant comprising:
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forming a plurality of planks of cortical bone, the planks having a broad surface terminating at edges, the surface being defined by a length and a width, the planks each having a thickness;
forming the broad surface of each of at least two of said planks for mating in abutting relation;
surface demineralizing all surfaces of the at least two planks;
clamping together the two at least planks with said mating broad surfaces abutting;
washing the clamped at least two planks;
forming at least one bore in the at least two clamped planks transversely the broad surfaces for receiving a locking pin therein;
forming a locking pin and inserting the locking pin in said at least one bore in each of the at least two clamped planks;
forming a plurality of ridges on first and second opposing sides of said clamped planks;
surface demineralizing the formed ridges;
freezing and/or drying under clamping pressure the resulting demineralized implant; and
thenunclamping the implant. - View Dependent Claims (124, 125, 126)
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127. A spinal implant comprising:
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first and second planks of cortical bone each plank having opposing broad surfaces, the bone having fibers running generally in a direction parallel to the broad surfaces of each plank;
a broad surface of each plank being surface demineralized and abutting, the demineralized surfaces having an acid applied thereto to form crystals on the deminerlized surface of each plank; and
forcing the abutting wet surfaces together to join the planks by interlocking the formed crystals of each bone;
the planks each having at least one bore that is surface deminerallized, the bore having a longitudinal axis that is normal to the fiber direction; and
a cortical bone pin in the plank bores for securing the planks together. - View Dependent Claims (128)
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129. A process of making a spinal implant comprising:
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forming first and second hydrated cortical bone planks with aligned bores;
surface demineralizing a bone pin and then dehydrating the pin;
inserting the dehydrated pin into the aligned bores; and
thenswelling the demineralized pin surface to provide a friction fit between the pin and bores. - View Dependent Claims (130, 131)
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132. A method of forming a bone pin comprising:
passing a bone through a set of a plurality of cutting dies of progressively smaller bore sizes to form the pin of a given peripheral dimension and shape from a bone of a larger peripheral dimension. - View Dependent Claims (133, 134, 135, 136, 137, 138)
Specification