Pelvic Ring Fixation Assembly With Rotating Schanz Pin Compression

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Solution Overview

Problem

Current pelvic ring injury treatment devices fail to provide simultaneous stabilization and adjustable compression of both the anterior and posterior joints, leading to high disability and mortality rates in unstable pelvic fractures, and are cumbersome to apply.

Innovation Solution

A pelvic ring injury treatment device with Schanz pins that allow independent rotation and adjustable compression through a base body with rotary links and fixing devices, enabling simultaneous compression of both joints and reducing complexity and production costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a closed complex and bulky frame is used to stabilize both joints, then simultaneous stabilization of anterior and posterior joints is achieved, but device complexity and bulkiness increase

Engineering Contradiction:

Improvesimultaneous stabilization of anterior and posterior jointsVSAvoidcomplexity of frame structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The frame structure is divided into two separate branches (first branch and second branch) that can be independently positioned and adjusted. Each branch targets one joint (anterior or posterior), allowing simplified individual components that together achieve comprehensive stabilization without requiring a single complex bulky frame

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The treatment device is designed to perform multiple functions through its two branches: each branch can provide stabilization, compression, and positioning for different joints. The Schanz pin accommodations and biasing mechanisms are universally applicable to both anterior and posterior joints, reducing overall device complexity while maintaining comprehensive functionality

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple fixture points and degrees of freedom are provided for anatomical adjustment, then adaptability to patient anatomy is improved, but device complexity and adjustment complexity increase

Engineering Contradiction:

Improveadjustment to patient anatomyVSAvoidnumber of degrees of freedom

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Each branch is equipped with localized adjustment capabilities specifically tailored to its target joint's anatomical requirements. The first branch has adjustment features optimized for the anterior joint while the second branch has features optimized for the posterior joint, allowing anatomical adaptation without requiring every part of the device to have multiple degrees of freedom

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The device incorporates dynamic adjustment mechanisms that allow real-time modification of branch positions, angles, and compression forces during application and treatment. The Schanz pin accommodations can be dynamically positioned along the branch lengths, and biasing forces can be adjusted independently for each joint, providing adaptability without fixed complex mechanisms

Inventive Principle:

Principle #15Dynamics

3Reliability

If Schanz pins are fixed rigidly to provide compression force, then compression stability is improved, but the risk of bone fragment displacement increases due to lack of rotational freedom

Engineering Contradiction:

Improvecompression force stabilityVSAvoidbone fragment displacement

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The connection between Schanz pins and the frame is made dynamic rather than rigid. The Schanz pin accommodations allow rotational movement and angular adjustment while maintaining compression force application. This dynamic connection adapts to bone fragment positioning needs while preserving stable compression, preventing harmful displacements that would occur with rigid fixed connections

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP4656147A1Pelvic ring injury treatment device and pelvic ring injury treatment assembly

Publication Date: 2025.12.03 GEORG AUGUST UNIVERSITAT GOTTINGEN STIFTUNG OFFENLICHEN RECHTS

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AI summary

The invention relates to a pelvic ring injury treatment device (19). The pelvic ring injury treatment device (19) comprises a base body (25) and two Schanz pin accommodations (54) for accommodating two Schanz pins (10, 11). The invention proposes that the pelvic ring injury treatment device (19) comprises two fixing devices (32) for fixing the Schanz pins (10, 11) in the Schanz pin accommodations (54). Furthermore, the pelvic ring injury treatment device (19) comprises two rotary links (33) for rotating the Schanz pin accommodations (54) relative to the base body (25) about axes of rotation (20, 21). According to the invention the Schanz pin accommodations (54) can be rotated relative to the base body (25) about the axes of rotation (20, 21) also when the fixing devices (32) are in the fixing state. The invention allows a simultaneous application of compression forces both to the anterior joint and the posterior joint of the pelvic ring.