Intrabody osteotomy implant and methods of use

Abstract

An intrabody implant disclosed and methods of use are disclosed. The implant has an inclined surface, forming a wedge shape having an acute angle adapted to be placed between at least 2 separated portions of a single bony structure (such as a vertebral body). In some embodiments, the implant may be used to support portions of a vertebral body that have been separated surgically as part of a pedicle subtraction osteotomy and to orient the portions at a more predictable lordotic angle.

1 . An intrabody implant adapted to be placed between at least 2 separated portions of a single bony structure, the intrabody implant comprising:
 a first surface configured for engaging a first of the at least two separated portions of the bony structure;   a second surface, disposed opposite the first surface, and configured for engaging a second of the at least two separated portions of the bony structure, the second surface disposed at an acute angle relative to the first surface;   a wall disposed between the first and second surfaces, the wall comprising an anterior portion and a posterior portion, the posterior portion having a posterior height and the anterior portion having an anterior height, the posterior and anterior heights being unequal to form the acute angle between the first surface and the second surface.   
     
     
         2 . An intrabody implant as recited in  claim 1  wherein the first and second surfaces define an aperture extending through the implant to allow for bone growth through the implant from the first portion of the bony structure to the second portion of the bony structure. 
     
     
         3 . An intrabody implant as recited in  claim 1 , wherein the posterior height is less than the anterior height such that the acute angle of the intrabody implant introduces a lordotic angle between the first and second portions of the bony structure. 
     
     
         4 . An intrabody implant as recited in  claim 1 , wherein the acute angle is between 10 degrees and 30 degrees. 
     
     
         5 . An intrabody implant as recited in  claim 1  wherein the posterior portion of the wall comprises an outer concave surface configured to conform to a posterior anatomy of the bony structure. 
     
     
         6 . An intrabody implant as recited in  claim 1  wherein the anterior portion of the wall comprises an outer convex surface configured to conform to an anterior anatomy of the bony structure. 
     
     
         7 . An intrabody implant as recited in  claim 1  wherein the posterior portion of the wall defines a convex profile between the first surface and the second surface. 
     
     
         8 . An intrabody implant as recited in  claim 1  wherein the implant includes a width extending parallel to the anterior portion and the posterior portion, the width being at least 40 mm. 
     
     
         9 . An intrabody implant as recited in  claim 1  wherein the first and second surfaces comprise a plurality of surface features extending outward from the surfaces to engage the bony structure. 
     
     
         10 . An intrabody implant as recited in  claim 1 , wherein the implant is formed entirely of PEEK polymer. 
     
     
         11 . An intrabody implant as recited in  claim 10 , further comprising a coating of titanium applied to the first and second surfaces. 
     
     
         12 - 20 . (canceled) 
     
     
         21 . An intrabody implant as recited in  claim 3 , wherein:
 the posterior portion of the wall comprises an outer concave surface configured to conform to a posterior anatomy of the bony structure; and   the anterior portion of the wall comprises an outer convex surface configured to conform to an anterior anatomy of the bony structure.   
     
     
         22 . An intrabody implant as recited in  claim 21 , wherein the first and second surfaces comprise rows of teeth having a substantially right-triangular profile, the teeth being sloped upwards toward the anterior portion. 
     
     
         23 . An intrabody implant as recited in  claim 1 , wherein the acute angle is between 15 degrees and 25 degrees. 
     
     
         24 . An intrabody implant as recited in  claim 1 , wherein the implant is formed entirely of bone material. 
     
     
         25 . An intrabody implant as recited in  claim 1 , wherein the first and second surfaces are smooth and the wall has no projections or surface features. 
     
     
         26 . An intrabody implant as recited in  claim 25 , wherein the implant comprises a coating applied to one or more of the first and second surfaces and the wall to encourage bone growth onto the implant, the coating comprising a material selected from a group consisting of gold, titanium, hydroxyapatite and combinations thereof. 
     
     
         27 . An intrabody implant as recited in  claim 25 , wherein the implant comprises a coating applied to one or more of the first and second surfaces and the wall to encourage bone growth onto the implant, the coating being applied with a roughened texture so as to provide a plurality of irregular projections that may serve as surface features configured to resist expulsion of the implant after implantation. 
     
     
         28 . An intrabody implant comprising:
 a first surface configured for engaging a first vertebra;   a second surface opposite the first surface configured for engaging a second vertebra, the second surface disposed at an angle between 10 and 30 degrees relative to the first surface; and   a wall disposed from the first surface to the second surface, the wall comprising an anterior portion and a posterior portion, the posterior portion having a maximum height that is less than a maximum height of the anterior portion, the posterior portion of the wall comprising an outer concave surface, the anterior portion of the wall comprising an outer convex surface, the posterior portion of the wall defining a convex profile from the first surface to the second surface,   wherein the first and second surfaces comprise rows of teeth having a substantially right-triangular profile, the teeth being sloped upwards toward the anterior portion.   
     
     
         29 . A system comprising:
 an intrabody implant comprising:
 a first surface configured for engaging a first vertebra, 
 a second surface opposite the first surface configured for engaging a second vertebra, the second surface disposed at an angle between 10 and 30 degrees relative to the first surface, and 
 a wall disposed from the first surface to the second surface, the wall comprising an anterior portion and a posterior portion, the posterior portion having a maximum height that is less than a maximum height of the anterior portion, the posterior portion of the wall comprising an outer concave surface, the anterior portion of the wall comprising an outer convex surface, the posterior portion of the wall defining a convex profile from the first surface to the second surface; 
   a pair of rods; and   two pairs of pedicle screws, the pedicle screws each comprising spaced apart arms that define a U-shaped implant cavity therebetween configured for disposal of one of the rods,   wherein the first and second surfaces comprise rows of teeth having a substantially right-triangular profile, the teeth being sloped upwards toward the anterior portion.