Anterior Hip Extractor with Arcuate Arm for Bone Stress Reduction

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Solution Overview

Problem

Conventional medical devices are not capable of properly executing the direct anterior approach for hip implant removal, often causing excess stress or damage to the bone during extraction.

Innovation Solution

An anterior hip extractor with an arcuate frame and fastener system that aligns the force of removal with the femur, minimizing bone stress, and allows attachment of a secondary extraction device for efficient implant removal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional posterior approach extraction tools are used for direct anterior approach hip implant removal, then the implant can be removed, but excess stress and unintended damage to the bone occurs

Engineering Contradiction:

Improveimplant removal capabilityVSAvoidbone stress and damage

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The extractor device inverts the conventional extraction approach by designing the arm to extend at a 40-50 degree angle relative to the base, opposite to the traditional posterior approach geometry. This inverted configuration enables force application aligned with the femur's longitudinal axis during direct anterior approach surgery, eliminating bone damage while maintaining extraction effectiveness.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The device changes the critical geometric parameter of the extraction tool's angle configuration from the conventional posterior approach geometry to a 40-50 degree angle relative to the implant aperture. This parameter change aligns the force vector with the femur's longitudinal axis, resolving the contradiction between extraction capability and bone stress reduction.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If conventional extraction tools are used, then implant removal is possible, but surgical efficiency is reduced due to improper force alignment

Engineering Contradiction:

Improvesurgical efficiencyVSAvoidbone damage

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The device inverts the conventional extraction geometry to match the direct anterior approach, enabling efficient force application along the femur's axis while preventing bone damage. This inverted design simultaneously improves surgical efficiency and eliminates harmful bone stress.

Inventive Principle:

Principle #13The other way round (Inversion)

3Object-affected harmful factors

If a properly aligned extractor is designed for direct anterior approach, then bone stress is minimized, but device complexity increases compared to conventional tools

Engineering Contradiction:

Improvebone stressVSAvoidextractor geometry

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The extractor device is segmented into distinct functional components: a base with aperture for implant engagement, a fastening mechanism, and an arm with specific 40-50 degree angular geometry. This segmentation allows each component to perform its specific function while maintaining overall simplicity despite the specialized angular configuration.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The device introduces a specific geometric parameter (40-50 degree angle) to the extractor design. While this parameter increases design specificity, the overall structure remains simple through modular segmentation, balancing bone stress reduction with manageable device complexity.

Inventive Principle:

Principle #35Parameter changes

4Adaptability or versatility

If conventional posterior approach tools are used, then existing equipment can be utilized, but proper force alignment with the femur cannot be achieved

Engineering Contradiction:

Improveequipment compatibilityVSAvoidforce alignment precision

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The extractor inverts the conventional posterior approach geometry to create a 40-50 degree angled configuration that enables precise force alignment with the femur during direct anterior approach surgery. This inverted design sacrifices universal compatibility with posterior approach protocols but achieves superior force alignment precision for anterior procedures.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The device changes the geometric parameter from conventional posterior approach angles to a specific 40-50 degree angle, sacrificing adaptability to existing posterior tools but achieving precise force alignment with the femur for direct anterior approach surgery.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10456270B2Anterior hip extractor

Publication Date: 2019.10.29 SHUKLA MEDICAL INC

AI summary

An implant extraction device and method are provided that are designed for the direct anterior approach method of hip implant removal. The device includes a proximal end having a first aperture for receiving the neck of a femoral implant, and a second aperture through which a clamp shaft is delivered on an axis approximately perpendicular to the longitudinal axis of the first aperture. An arcuate column extends from the proximal end. The shape of the arcuate column effectively orients the extraction device and an attachable impaction frame relative to one another such that the force applied to the frame to remove the implant is essentially parallel to the longitudinal axis of the hip implant, thus minimizing the likelihood of damage to the femur bone caused by excessive or unbalanced forces.