Patent ID: 6436100
Filing Date: 2002-08-20
Classification: A61B

Abstract:
A combination bone screw and driver assembly for driving a cannulated internally threaded bone screw, comprising:a bone screw with an elongated cylindrical shank having a proximal end, a distal end, an outer surface; a head integrally formed at the proximal end and a tip portion formed at the distal end; a cylindrical throughgoing bore extending through said head and shank; an engagement structure formed in said head shaped to engage and receive torque from a driver having an end portion with a shape complimentary to the shape of the engagement structure; an external thread formed on said shank outer surface running at least one half the length of the shank outer surface and an internal thread formed on a surface defining said inner cylindrical bore running substantially the length of the shank; said driver comprising a shaft member defining an internal throughgoing bore and an engagement structure formed at the distal end of said shaft member to engage the shaft member to a complimentary engagement structure formed in said head of the internally threaded screw to apply torque thereto; a handle member mounted to the proximal end of said shaft member; a rod removably mounted within said shaft member bore, said rod having a length which is greater than the length of the shaft member, and an outer diameter which is less than the inner diameter of said shaft member bore, said rod defining a thread portion formed at one end which can be threaded along the internal thread of said bone screw; and a cap member removably mounted on the other end of said rod to apply torque to said rod and retain said rod within said shaft member when said bone screw is threadedly engaged on said one end of said rod.