Length adjustable modular screw system
Inventors
Geist, Wyatt Drake • SOUZA, SR., John
Assignees
Geist Wyatt • Folsom Metal Products Inc • Kapstone Medical LLC
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Publication Number
US-11633220-B2
Publication Date
2023-04-25
Expiration Date
Abstract
A length adjustable modular screw includes a neck assembly and a shank. The neck assembly has proximal and distal ends and includes an expander component and a collet component that are slidably engagable by insertion of the expander component in a through channel of the collet component along a common axis. The length adjustable modular screw also includes a shank suitable for insertion and retention within a bone, the shank including a threaded portion between proximal and distal ends and a socket adapted to coaxially receive at least a portion of the distal end of the neck assembly. The length adjustable modular screw has a length that is selected by splaying at least a portion of the distal end of the engaged expander and collet components of the neck assembly within the socket of the shank.
Core Innovation
The invention provides a length adjustable modular screw for bone anchor system installation for spinal fixation. The screw includes a neck assembly with an expander component and a collet component, with proximal and distal ends, and the expander and collet components are slidably engagable by insertion of the expander component in a through channel of the collet component along a common axis.
The neck assembly is received by a shank that includes a threaded portion and a socket adapted to coaxially receive at least a portion of the distal end of the neck assembly. The length of the length adjustable modular screw is selected by splaying at least a portion of the distal end of the engaged expander and collet components within the socket of the shank, and the screw is configured to be monoaxial, uniaxial, or poly-axial.
The installation method includes engaging and inserting the neck assembly into the socket of the shank, contacting the distal end of the shank with a bone, splaying the distal end of the engaged expander and collet components within the socket, and driving the threaded portion of the shank into the bone. Afterward, the length is adjusted by sliding the neck assembly along the common axis within the socket of the shank, and a locking element is tightened within a retaining housing to compress a spinal rod against the neck assembly and lock the neck assembly within the socket of the shank.
Claims Coverage
The partial content provides one independent claim as a surgical method and describes the method’s key inventive features through that claim.
Length adjustable modular screw with expander-collet splaying in a shank socket
A length adjustable modular screw comprising a neck assembly including an expander component and a collet component, slidably engagable by insertion of the expander component in a through channel of the collet component along a common axis, and a shank having a threaded portion and a socket adapted to coaxially receive at least a portion of the distal end of the neck assembly, wherein the screw length is selected by splaying at least a portion of the distal end of the engaged expander and collet components within the socket of the shank.
Monoaxial, uniaxial, and poly-axial configurable length adjustable modular screw
The length adjustable modular screw is monoaxial, uniaxial, or poly-axial.
Surgical installation method for spinal fixation with retaining housings and locking elements
A surgical method for installing a bone anchor system for spinal fixation by selecting a spinal rod defining a longitudinal axis, two or more retaining housings adapted for engaging and securing a bone anchor and the at least one spinal rod, and two or more locking elements adapted for securing the at least one spinal rod to a bone anchor, and installing the selected length adjustable modular screw by seating the neck assembly in a retaining housing, engaging the neck assembly components and inserting the neck assembly into the shank socket, splaying the distal end within the socket, driving the threaded portion into bone, adjusting length by sliding the neck assembly along the common axis, and tightening a locking element within the retaining housing to compress the spinal rod against the neck assembly and lock the neck assembly within the socket of the shank.
Across the independent claim, the principal inventive concept centers on a length adjustable modular screw in which expander and collet components are slidably engagable along a common axis and the selected screw length is produced by splaying within a socket of a shank, combined with a spinal fixation installation method that includes adjusting the neck assembly along the common axis and tightening a locking element to compress and lock the spinal rod to the neck assembly.
Stated Advantages
Documented Applications
Spinal fixation surgery using a bone anchor system for installing length adjustable modular screws with spinal rod engagement.
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