Patent ID: 9649142
Date: 2017-05-16
CPC Classifications: A61B

Claim:
1. A bottom loading modular head assembly for stabilizing bones comprising: a bone screw having a first end and a second end, said first end constructed and arranged as a shank portion for penetrating securement to a bone, said second end constructed and arranged as a head portion; a connector for securing a rod to an anchored bone screw, said connector formed from a clamp securable to said head portion of said anchored bone screw wherein said clamp is inserted over said head portion of said anchored bone screw, said clamp having an elongated body with an exterior wall, said exterior wall including at least one annular bulge to provide a change in the external diameter of said exterior wall, at least one pin slot having a pin receiving portion constructed and arranged for receipt of a pin, said pin receiving portion comprising an expansion slot at a distal end and an opening at a proximal end forming a lip to allow uni-directional movement of said pin through said lip into a passageway; said passageway further comprising an expansion slot at an apex of said passageway; a rod slot extending across said exterior wall constructed and arranged to accept said rod; and, a compression ring surrounding said exterior wall, said compression ring comprises a pin receiving aperture which aligns with said pin receiving portion of said clamp when said assembly is in an unlocked position during installation; wherein said clamp is linearly traversable along said exterior walls between a first or open position and a second or closed position by application of a force consisting of a linear force along a longitudinal axis of said clamp, whereby traversal of said clamp from said first position to said second position simultaneously causes (i) said pin to move past said lip portion and into shaft, said compressive forces prohibiting said pin from being pushed back into said pin receiving slot, and (ii) causes said clamp to cooperate with said at least one annular bulge to apply compressive forces to said clamp to immobilize the connections between said clamp and said rod and said clamp and said anchored bone screw.