Spinous Process Fusion Implants and Insertion, Compression, and Locking Instrumentation

Abstract

A bone plate assembly including at least one bone plate, polyaxially adjustable fixation elements and a polyaxially adjustable locking mechanism. A first plate includes at least one polyaxial element for lockable connection with a fixation pad, and a connection feature which allows the plate to translate and polyaxially rotate relative to the locking mechanism. A second plate includes at least one polyaxial element for connection with a fixation pad and a connection feature for non-rotatable connection with the locking mechanism. The locking mechanism allows translation and polyaxial adjustment of the first plate relative to the second plate and locks the first and second plates via a taper lock. The fixation pad includes a deflectable spacer configured to prevent premature locking of the pad. Methods for implantation of the bone plate assembly between bone structures are disclosed. Instrumentation for implantation, compression and locking of the bone plate assembly is disclosed.

1 . A device, comprising:
 an implant, wherein the implant comprises a first portion, a second portion opposite the first portion, and a locking mechanism coupling the first portion to the second portion; and   wherein the implant has an insertion configuration, a clamped configuration, and a first locked configuration;   wherein the first portion is adapted to be urged toward the second portion to change the implant from the insertion configuration to the clamped configuration, wherein the first portion is adapted to polyaxially rotate relative to the second portion as the first portion is urged toward the second portion;   wherein, in the clamped configuration, the first portion is adapted to be fixed relative to the second portion;   wherein at least a first component of the locking mechanism is adapted to be urged from an unlocked position to a first locked position to change the implant from the clamped configuration to the first locked configuration, wherein the first portion is adapted to be fixed relative to the second portion as the first component is urged from the unlocked position to the first locked position;   wherein, in the first locked configuration, the first component maintains the first portion fixed relative to the second portion.   
     
     
         2 - 3 . (canceled) 
     
     
         4 . The device of  claim 1 , wherein the implant is adapted to receive force from a primary instrument on the first component when in the locked configuration while avoiding contact with the primary instrument at the locking mechanism in the insertion configuration and the clamped configuration. 
     
     
         5 - 20 . (canceled) 
     
     
         21 . The device of  claim 1  wherein the implant further includes at least one pad disposed on at least one of the first portion and second portion. 
     
     
         22 . The device of  claim 21  wherein the at least one pad is polyaxially rotatable prior to the implant entering the clamped configuration. 
     
     
         23 . The device of  claim 1  wherein the locking portion extends between the first and second portion and is configured to be disposed transversely between two spinous processes when the implant is inserted. 
     
     
         24 . The device of  claim 1  wherein the implant further comprises at least one opening window and a chamber that is adapted to receive graft material to promote bone fusion. 
     
     
         25 . A device comprising:
 an implant having a first portion, a second portion opposite the first portion, and a locking mechanism coupling the first portion to the second portion; and   wherein the implant is adapted to be disposed in an insertion configuration, a clamped configuration, and a first locked configuration;   wherein the first portion is adapted to be polyaxially rotatable relative to the second portion while in the insertion configuration, and wherein, upon receiving a first clamping force at the locking mechanism, the implant is adapted to transition from the insertion configuration to the clamped configuration and the first portion becomes fixed relative to the second portion;   wherein the implant is further configured to transition from the clamped configuration to the first locked configuration upon receiving a second clamping force at the locking mechanism while maintaining the fixed relationship between the first and second portions.   
     
     
         26 . The device of  claim 25 , wherein the implant is adapted to receive force from a primary instrument on the first component while avoiding contact with the primary instrument at the locking mechanism in the insertion configuration and the clamped configuration. 
     
     
         27 . The device of  claim 25  wherein the implant further includes at least one pad disposed on at least one of the first portion and second portion. 
     
     
         28 . The device of  claim 27  wherein the at least one pad is polyaxially rotatable prior to the implant entering the clamped configuration. 
     
     
         29 . The device of  claim 25  wherein the locking portion extends between the first and second portion and is configured to be disposed transversely between two spinous processes when the implant is inserted. 
     
     
         30 . The device of  claim 25  wherein the implant further comprises at least one opening window and a chamber that is adapted to receive graft material to promote bone fusion.