Length adjustable modular screw system
AssigneeIntegrity Implants Inc.
InventorsWyatt Drake GEIST, John SOUZA, JR.
Life of this patent
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Abstract
A system including anchors, anchor components, and anchor assemblies and subassemblies that are adapted for attachment to a bony structure of a clinical subject. For example, two or more such anchors in the form of screws may be affixed to bones, for example, vertebral structures such as the pedicle, and each anchor is connected to a stabilizer such as a surgical rod that is inserted between the anchors. The anchors and assemblies are novel in many respects owing to their modular nature and height adjustability, which in contrast to conventional systems, allows the anchors to be provided to a surgeon in modular, sub assembled and fully assembled form to enable a broad array of choices in devising the optimal plane for surgical bone fixation.
Claims20
A length adjustable modular anchor system for engagement with a bone, the length adjustable modular anchor system comprising:
- a length adjustable modular screw comprising a neck assembly and a shank
- the neck assembly comprising an expander component and a collet component, a portion of the expander component insertable within a through channel in the collet component along a common axis, each of the expander and collet components comprising cooperating features that are compressible together to splay the collet
- the expander component comprising a head at a proximal end and a pin 330 that extends from the head at a distal end
- the collet component comprising at a proximal end a seat that is matable with the head of the expander component, and comprising at a distal end a collet that extends from the seat, the collet comprising at least one through slot oriented parallel to the common axis and along at least a portion of the collet through the distal end, the collet component through channel originating within the seat and extending through the distal end of the collet, and
- a shank comprising a threaded portion between proximal and distal ends and comprising at the proximal end an aperture in communication with a socket that extends within the shank along a length from the proximal end toward the distal end for receiving at least a portion of the collet of the neck assembly wherein the neck assembly is adjustably engagable within the shank to achieve variable length of the length adjustable modular screw.
A length adjustable modular anchor system for engagement with a bone, the length adjustable modular anchor system comprising:
- a length adjustable modular screw comprising a neck assembly and a shank
- the neck assembly comprising an expander component and a collet component, a portion of the expander component insertable within a through channel in the collet component along a common axis, each of the expander and collet components comprising cooperating features that are compressible together to splay the collet
- the expander component comprising a head at a proximal end and a pin that extends from the head at a distal end
- the collet component comprising at a proximal end a seat that is matable with the head of the expander component, and comprising at a distal end a collet that extends from the seat, the collet comprising at least one through slot oriented parallel to the common axis and along at least a portion of the collet through the distal end, the collet component through channel originating within the seat and extending through the distal end of the collet, and
- a shank comprising a threaded portion between proximal and distal ends and comprising at the proximal end an aperture in communication with a socket that extends within the shank along a length from the proximal end toward the distal end for receiving at least a portion of the collet of the neck assembly
- wherein the neck assembly is adjustably engagable within the shank to achieve variable length of the length adjustable modular screw;
- and
- at least one spinal rod;
- a retaining housing and a locking element for engaging and securing the length adjustable modular screw and the surgical rod;
- and
- optionally, one or more compression washers for engagement between a rod and a bone anchor.
Dependencies are inferred from the claim text.