Bone screw assembly

Abstract

Spine stabilization systems are disclosed. One spine stabilization system includes a bone screw assembly including a coupling member and a screw member received therein. The coupling member includes a pair of extension elements that form a pair of slots. The slots include bottom angled surfaces. An angled wedge member having a substantially horizontal bottom surface and an angled top surface is delivered on top of the screw member within the coupling member. A rod member can be delivered down the coupling member such that it rests on the slots and on top of the angled wedge member. A locking assembly comprising a cap member and set screw can be delivered down the coupling member to secure the rod member to the coupling member. The rod member and locking assembly components can be delivered through a single incision and at a same or similar angle as the screw member during surgery.

What is claimed is: 
     
         1 . A bone stabilization system comprising:
 a coupling member;   a screw member configured to be received in the coupling member;   a wedge member configured to be received in the coupling member, wherein the wedge member includes a bottom surface and a top surface that is non-parallel to the bottom surface;   a rod implant configured to be received in the coupling member; and   a locking assembly configured to secure the rod implant within the coupling member,   wherein the coupling member includes first and second angled slots, the first angled slot having a greater length than the second angled slot.   
     
     
         2 . The bone stabilization system of  claim 1 , wherein the coupling member includes a pair of extension elements. 
     
     
         3 . The bone stabilization system of  claim 2 , wherein the angled slots having angled contact surfaces between the extension elements. 
     
     
         4 . The bone stabilization system of  claim 1 , wherein the coupling member includes a bumper element along an inner surface of the coupling member. 
     
     
         5 . The bone stabilization system of  claim 4 , wherein the bumper element comprises an angled shoulder. 
     
     
         6 . The bone stabilization system of  claim 1 , further comprising a coupling body component having one or more slots to assist in securing the screw member to the coupling member. 
     
     
         7 . The bone stabilization system of  claim 1 , wherein the bottom surface of the wedge member is substantially horizontal. 
     
     
         8 . The bone stabilization system of  claim 1 , wherein the top surface of the wedge member is at an angle of between about 15 and 30 degrees from the bottom surface. 
     
     
         9 . The bone stabilization system of  claim 1 , wherein the locking assembly includes a cap member and a set screw received therein. 
     
     
         10 . The bone stabilization system of  claim 9 , wherein the set screw includes an angled bottom surface. 
     
     
         11 . The bone stabilization system of  claim 10 , wherein the angled bottom surface of the set screw is substantially parallel to the angled top surface of the wedge member. 
     
     
         12 . A bone stabilization system comprising:
 a coupling member including a pair of extension elements and a pair of angled slots formed therebetween, wherein the angled slots include angled contact surfaces and have different lengths;   a screw member configured to be received in the coupling member;   a wedge member configured to be received in the coupling member and positioned on top of the screw member;   a rod implant configured to be received in the coupling member and seated on top of the angled contact surfaces; and   a locking assembly configured to secure the rod implant within the coupling member.   
     
     
         13 . The bone stabilization system of  claim 12 , wherein the coupling member includes a recessed groove for receiving the wedge member. 
     
     
         14 . The bone stabilization system of  claim 12 , wherein the pair of angled slots include angled contact surfaces that are at a substantially similar angle to a surface of the wedge member. 
     
     
         15 . The bone stabilization system of  claim 12 , wherein the wedge member includes a bottom surface and a top surface at a non-parallel angle to the bottom surface. 
     
     
         16 . The bone stabilization system of  claim 12 , wherein the top surface is at an angle of between about 15 and 30 degrees relative to the bottom surface. 
     
     
         17 . The bone stabilization system of  claim 12 , further comprising a coupling body component having one or more slits configured to fit around at least a portion of a head of the screw member. 
     
     
         18 . The bone stabilization system of  claim 12 , wherein the locking assembly includes a cap member and a set screw therein. 
     
     
         19 . The bone stabilization system of  claim 18 , wherein the set screw includes an angled bottom surface that is substantially parallel to the angled contact surfaces of the coupling member. 
     
     
         20 . A bone stabilization system comprising:
 a coupling member including a pair of extension elements, wherein the pair of extension elements form slots, wherein the coupling member has a bottom surface and a top surface, the top surface being angled with respect to the bottom surface;   a screw member including a head and a threaded shaft, wherein the screw member is configured to be received in the coupling member;   a coupling body component including one or more slits, wherein the coupling body component is configured to extend over a portion of the head of the screw member to assist in securing the screw member to the coupling member a wedge member configured to be received in the coupling member on top of the screw member, the wedge member including a substantially horizontal bottom surface and a top surface;   a rod member receivable in the slots of the coupling member, wherein the rod member is configured to contact the top surface of the wedge member; and   a locking assembly comprising a cap member and a set screw, the set screw having an angled bottom surface that is substantially at the same angle as the angled top surface of the coupling member, wherein the locking assembly is configured to be delivered down the coupling member to apply a compressive force that secures the rod member within the coupling member.