Bone Compression Screw With Anti-Rotation Hook

Solution Overview

Problem

Existing compression screw systems for bone fixation do not provide adequate compression and stability, often requiring multiple screws or additional devices, which increases the risk of complications.

Innovation Solution

A compression screw system comprising a compression screw component and a hook component with anti-rotation features and cooperating structures, allowing the hook component to attach securely to the compression screw component, providing both intra-medullary and extra-medullary compression and stabilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple compression screws or additional devices are used to provide adequate compression and stability, then the compression and stabilization effect is improved, but the device complexity and risk of complications increase

Engineering Contradiction:

Improvestabilization effectVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines multiple functions (compression, stabilization, anti-rotation) into a single integrated compression screw device. The screw includes integrated features such as a hooked end for stabilizing bone fragments, threads for compression, and an enlarged head with positioning features, eliminating the need for separate stabilization devices or multiple screws.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The compression screw is designed as a multi-functional device that simultaneously provides compression through its threads, stabilization through its hooked end that engages bone fragments, and anti-rotation control through its enlarged head with positioning features. This single device performs multiple functions that would traditionally require separate components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If a single compression screw is used to reduce device complexity, then the ease of operation is improved, but the compression and stabilization effect deteriorates

Engineering Contradiction:

Improvenumber of componentsVSAvoidcompression and stabilization effect

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent combines multiple functions (compression, stabilization, anti-rotation) into a single integrated compression screw device. The screw includes integrated features such as a hooked end for stabilizing bone fragments, threads for compression, and an enlarged head with positioning features, eliminating the need for separate stabilization devices or multiple screws.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The compression screw features a dynamic design where the hooked end can engage and stabilize bone fragments while the threads provide progressive compression as the screw is advanced. The enlarged head with positioning features allows for dynamic adjustment and positioning during insertion, ensuring proper orientation and engagement.

Inventive Principle:

Principle #15Dynamics

3Reliability

If the compression screw is designed with additional features for anti-rotation and stabilization, then the reliability is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improveanti-rotation featureVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent combines multiple functions (compression, stabilization, anti-rotation) into a single integrated compression screw device. The screw includes integrated features such as a hooked end for stabilizing bone fragments, threads for compression, and an enlarged head with positioning features, eliminating the need for separate stabilization devices or multiple screws.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The compression screw employs asymmetric design features including a hooked end with specific curvature for engaging bone fragments, non-circular enlarged head geometry for anti-rotation positioning, and asymmetric thread patterns. These asymmetric features provide enhanced stabilization and anti-rotation capabilities while being manufacturable using standard forming and machining processes.

Inventive Principle:

Principle #4Asymmetry

Data Source

PatentUS10321942B2Compression screw systems for compressing bones of the extremities

Publication Date: 2019.06.18 LIFE SPINE INC

AI summary

Compression screw systems for stabilizing and/or compressing bones of the extremities, characterized by a compression screw component and a hook component. The hook component is received on the compression screw component in any rotational position relative to the compression screw component in order to orient the hook component relative to a bone or bones requiring stabilization and/or compression. The hook component includes an anti-rotation feature, while a configured flange thereof provides a hook that extends about and overhangs a part of the bone. The compression screw component and the hook component may include cooperating structures that allow the hook component to attach to the compression screw component or allow the compression screw component to self-orientate with respect to the hook component upon compressing engagement of the compression screw head with the hook component. The configured flange of the hook component may terminate with a single, double or multiple tined prong.