Bone Screw Locking Receiver With Counterbore for Angled Plate Fixation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bone screws inserted at non-parallel angles to the longitudinal axis of stabilization plates cause deformation and misalignment, leading to improper fitting and potential disengagement.
Innovation Solution
A bone screw locking receiver with a counterbore and helical threads provides a secure interference fit, allowing the screw to be coupled at various angles while limiting lateral deformation, ensuring a flush surface and stable fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bone screws are inserted at non-parallel angles to the longitudinal axis of stabilization plates, then the screw can be positioned to achieve desired anchoring, but the stabilization plate deforms and the screw does not fit flush with the plate
Solution Approach 1:
The hole in the stabilization plate is segmented into two distinct portions: a first portion (counterbore) and a second portion (threaded section). This segmentation allows the screw head to be received at an angle in the first portion while the threaded portion engages the bone through the second portion, resolving the conflict between angular adaptability and flush fitting precision
Solution Approach 2:
The counterbore creates an additional dimensional space within the hole structure, allowing the screw to be positioned at non-parallel angles relative to the stabilization plate's longitudinal axis. This extra dimensional accommodation enables angular versatility without compromising the overall structural integrity and flush fit of the stabilization plate
2Adaptability or versatility
If bone screws are inserted at non-parallel angles to the longitudinal axis of stabilization plates, then the screw can be positioned to achieve desired anchoring, but the stabilization plate deforms
Solution Approach 1:
Dividing the hole into a counterbore portion and a threaded portion allows the stabilization plate to accommodate angular screw insertion without transmitting deforming forces to the overall plate structure. The counterbore acts as a buffer zone that isolates the angular stress from the main plate body, preserving structural integrity
Solution Approach 2:
The counterbore serves as a pre-designed cushioning structure that absorbs and distributes the mechanical stress generated by angular screw insertion. This beforehand cushioning prevents stress concentration that would otherwise cause deformation or failure of the stabilization plate
Data Source
AI summary
Various implementations described herein include a screw locking receiver. The screw locking receiver includes a receiver frame which has a first surface, a second surface opposite and spaced apart from the first surface, and an inner surface which extends between the first surface and the second surface. The receiver frame defines a cylindrical inner channel having a central axis. The receiver includes a counterbore which extends along a first portion of the inner surface. The receiver includes a plurality of threads extending helically about a second portion of the inner surface. The counterbore has a diameter that is sufficient to accept a screw head having a non-parallel central axis with respect to a central axis of the inner channel when in a fastened position.