Orthopaedic Implants and Prostheses

• US 20080281425A1
• Filed: 02/20/2008
• Published: 11/13/2008
• Est. Priority Date: 02/21/2007
• Status: Abandoned Application

• Current Assignee: Surgicraft Limited (Surgicraft Group Holdings Ltd.)
• Original Assignee: Surgicraft Limited (Surgicraft Group Holdings Ltd.)
• Inventors: Stinson, David T., Thalgott, John
• Application Number:
  US12/034,062
• Publication Number:
  US 20080281425A1
• Time in Patent Office: Days
• US Class Current: 623/17.16
• CPC Class Codes: A61B 17/8033 having indirect contact with screw heads, or having contact with screw heads maintained with the aid of additional components, e.g. nuts, wedges or head covers
• CPC Class Codes: A61B 17/86 Pins or screws or threaded wires; nuts therefor A61B17/72 take precedence
• CPC Class Codes: A61F 2/4465 having a circular or kidney shaped cross-section substantially perpendicular to the axis of the spine
• 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 2/4684 Trial or dummy prostheses
• CPC Class Codes: A61F 2002/2817 Bone stimulation by chemical reactions or by osteogenic or biological products for enhancing ossification, e.g. by bone morphogenetic or morphogenic proteins [BMP] or by transforming growth factors [TGF]
• CPC Class Codes: A61F 2002/30062 (bio)absorbable, biodegradable, bioerodable, (bio)resorbable, resorptive
• CPC Class Codes: A61F 2002/30331 made by longitudinally pushing a protrusion into a complementarily-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2002/30385 the rib and groove having non-parallel, e.g. conically-tapered, cooperating sides, e.g. having a trapezoidal front cross-section
• CPC Class Codes: A61F 2002/30387 Dovetail connection
• CPC Class Codes: A61F 2002/30426 Bayonet coupling
• 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 2002/305 Snap connection
• CPC Class Codes: A61F 2002/30507 using a threaded locking member, e.g. a locking screw or a set screw
• CPC Class Codes: A61F 2002/30517 using a locking plate
• CPC Class Codes: A61F 2002/30538 for adjusting angular orientation
• CPC Class Codes: A61F 2002/30579 with mechanically expandable devices, e.g. fixation devices
• CPC Class Codes: A61F 2002/30593 hollow
• CPC Class Codes: A61F 2002/30604 modular
• CPC Class Codes: A61F 2002/30616 : Sets comprising a plurality of prosthetic parts of different sizes or orientations
• CPC Class Codes: A61F 2002/30624 : Hinged joint, e.g. with transverse axle restricting the movement
• CPC Class Codes: A61F 2002/30733 : Inserts placed into an endoprosthetic cavity, e.g. for modifying a material property
• CPC Class Codes: A61F 2002/30787 : inclined obliquely with respect to each other
• CPC Class Codes: A61F 2002/3082 : Grooves
• CPC Class Codes: A61F 2002/30841 : Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
• CPC Class Codes: A61F 2002/30904 : serrated profile, i.e. saw-toothed
• 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: A61F 2210/0004 : bioabsorbable
• CPC Class Codes: A61F 2220/0025 : Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
• CPC Class Codes: A61F 2220/0033 : made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit
• CPC Class Codes: A61F 2220/0091 : connected by a hinged linkage mechanism, e.g. of the single-bar or multi-bar linkage type
• CPC Class Codes: A61F 2250/0006 : for adjusting angular orientation
• CPC Class Codes: A61F 2310/00131 : Tantalum or Ta-based alloys
• CPC Class Codes: A61F 2310/00293 : containing a phosphorus-containing compound, e.g. apatite

Abstract

Disclosed herein are modular spinal implants having components which are interlocked together to form a single implant. Specifically exemplified herein are implants that are sectioned along a longitudinal plane. Implants are disclosed which include channels for inter-fragmentary association with an elongate bone screw and which allow for angular variability of the screw relative to the channel. Also disclosed is an anti-backout mechanism that helps prevent fixators from backing out upon securement of the implant in the spine. Kits comprising different sizes and inclination angles of components are disclosed, which can assist the surgeon in preoperatively assembling an implant to best fit in the surgical site of the patient.

Claims

1-80. -80. (canceled)

81. A modular interbody implant comprising

a first component comprising a perimeter side surface, a top surface, a longitudinal plane and a bottom surface;

and

a second component comprising a perimeter side surface, a top surface, a longitudinal plane and a bottom surface, said first and second components being adjoined together along said longitudinal plane to comprise a unitary implant comprising an implant top surface, an implant bottom surface and an implant perimeter side surface and wherein said first and second components form a tapered dimension in a sagital plane of said unitary implant thereby emulating a disc anatomy.

82. A modular interbody implant as claimed in claim 81, wherein said unitary implant comprises a first channel being defined according to a vector that begins at said implant perimeter side surface and traverses a plane of said implant top surface and a second channel being defined according to a vector that begins at said implant perimeter side surface and traverses a plane of said implant bottom surface.

83. A modular interbody implant as claimed in claim 81 wherein said first and second components form a tapered convex form in a sagital plane and an elliptical dimension in a coronal plane.

84. The implant of claim 81, wherein:

(i) said second component comprises at least two channels defined therethrough, said at least two channels comprising at least one channel being defined according to a vector that begins at said implant perimeter side surface and traverses a plane of said implant top surface and at least one channel defined according to a vector that begins at said implant perimeter side surface and traverses a plane of said implant bottom surface;

or

(ii) said first component comprises at least one channel defined therethrough defined according to a vector that begins at said implant perimeter side surface and traverses a plane of said implant top surface or implant bottom and said second component comprises at least one channel defined therethrough defined according to a vector that begins at said implant perimeter side surface and traverse a plane of said implant top surface or implant bottom surface.

85. The implant of claim 81, wherein said first and second channels are sized and configured such that an elongate bone fixator may separately pass through each of said at least two channels so as to allow for up to 20 degrees either side of centre angular variability of said elongate bone fixator about a central axis of each of said first and second channels.

86. The implant as claimed in claim 85 wherein one or more of said first and second channels comprise tapered channels.

87. The implant of claim 86, wherein said first and second channels are configured so as to allow an interfragmentary association with said elongate bone fixator.

88. The implant of claim 81, wherein said implant comprises an instrument interface associated therewith.

89. The implant of claim 88, wherein said instrument interface is an interface receptacle defined in said unitary implant or an interface extension extending from said implant.

90. The implant of claim 82 further comprising at least one locking component movably affixed thereto and proximate to at least one of said at least two channels such that said locking component can be shifted to block at least a portion of said proximate channel.

91. The implant of claim 81 useful for an anterior surgical approach, wherein:

the first component is a posterior component (PC) comprising a PC perimeter side surface, a PC top surface and a PC bottom surface; and

the second component is an anterior component (AC) comprising an AC perimeter side surface, an AC top surface and an AC bottom surface, wherein;

(i) said anterior and posterior components are adjoined together along a coronal, longitudinal plane to form a unitary implant comprising an implant perimeter side surface having an implant anterior side and an implant posterior side, a first implant lateral side extending in a direction between said implant anterior and posterior sides and a second implant lateral side extending in a direction between said implant anterior and posterior sides; and

an implant top surface and an implant bottom surface;

(ii) said implant anterior side is comprised of said anterior component and said posterior side is comprised of said posterior component.

92. The implant of claim 91 wherein said anterior component comprises at least one receptacle defined therein or at least one extension member, or both and said posterior component comprises at least one receptacle defined therein or at least one extension member;

wherein said anterior component and posterior component are adjoined by mating of an extension member of one component with a receptacle in another component.

93. The implant of claim 91, wherein said anterior component comprises at least two channels defined therethrough, said at least two channels comprising at least one vector that beguins at said AC perimeter side surface and transverses a plane of said AC top surface and at least one channel defined by a vector that beguins at said AC perimeter side surface and traverses a plane of said AC bottom surface.

94. The modular interbody implant of claim 81 useful for an antero-lateral surgical approach, wherein:

said first and second components are adjoined together along a transverse longitudinal plane to form a unitary implant comprising an implant perimeter side surface an implant top surface and an implant bottom surface; and

, optionally,

said second component comprises said first and second channels or said second component comprises at least one channel and said first component comprises at least one channel.

95. The modular interbody implant of claim 94, wherein said unitary implant defines a cavity contained within at least a majority of said implant perimeter side surface, said cavity communicating with said implant top surface or said implant bottom surface, or both.

96. The implant of claim 94, wherein said implant comprises at least one locking component movably affixed thereto and proximate to each of said first and second channels such that said locking component can be shifted to block at least a portion of its proximate channel.

97. The implant of claim 94, wherein said first and second channels are sized and configured such that an elongate bone fixator may separately pass through each of said at least two channels so as to allow for up to 20 degrees either side of centreangular variability of said elongate bone fixator about a central axis of each of said first and second channels.

98. The implant of claim 97, wherein said first and second channels are configured so as to allow an interfragmentary association with said elongate bone fixator.

99. The modular interbody implant of claim 81 for use with a lateral surgical approach, wherein:

the first component is a posterior component (PC) comprising a PC body having a PC anterior side

the second component is an anterior component (AC) comprising an AC body having an AC posterior side;

wherein;

said anterior component and said posterior component are adjoinable together along a coronal, longitudinal plane such that said AC posterior side and said PC anterior side face each other to form a unitary implant having an implant perimeter side surface having first lateral end, an implant second lateral end, an implant anterior side, and an implant posterior side, and an implant top surface and an implant bottom surface.

100. The modular interbody implant of claim 99 wherein said AC posterior and said PC anterior side are slidably or otherwise engaged.

101. The modular interbody implant of claim 99, wherein said AC posterior side comprises a groove and PC anterior side comprises a ridge member, or vice versa, wherein said ridge member is configured to slide and lock into said groove.

102. The implant of claim 99 wherein said first and second channels are sized and configured such that an elongate bone fixator may separately pass through each of said at least two channels so as to allow for up to 20 degrees either side of centre angular variability of said elongate bone fixator about a central axis of each of said first and second channels.

103. The implant of claim 102, wherein said first and second channels are configured so as to allow an interfragmentary association with said elongate bone fixator.

104. The implant of claim 99 wherein said anterior component comprises at least one of said first and second channels and said posterior component comprises at least one of said first and second channels.