Pivotable Osteotomy Jig for Accurate Bone Alignment

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Solution Overview

Problem

Existing osteotomy assistance jigs are not applicable to open wedge high tibial osteotomy (OWHTO), despite its popularity, limiting their ability to accurately reproduce preoperative planning alignments during operations.

Innovation Solution

An osteotomy assistance jig with a first registration member for setting the distal screw bolt position and a pivotable second registration member for setting the proximal screw bolt position, allowing for adjustable alignment based on preoperative planning, along with a digital template for precise bone cutting and fixation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If an osteotomy assistance jig is designed for closed wedge high tibial osteotomy (CWHTO), then it can accurately reproduce osteotomy alignment for CWHTO, but it cannot be applied to open wedge high tibial osteotomy (OWHTO)

Engineering Contradiction:

Improveapplicability to different osteotomy typesVSAvoidjig structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The second registration member is made pivotable relative to the first registration member around a pivot axis on the bone cutting line, allowing the jig to adapt to different osteotomy angles and types (CWHTO and OWHTO) while maintaining accurate alignment reproduction

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The jig is designed with adjustable components that enable it to perform multiple functions: it can be configured for both closed wedge and open wedge high tibial osteotomies, as well as corrective osteotomies, by adjusting the pivot angle and registration member positions

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If a fixed structure is used to set screw bolt positions, then the alignment is stable, but it cannot be adjusted for different preoperative planning requirements

Engineering Contradiction:

Improveadjustability for different planningVSAvoidalignment stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The second registration member can pivot relative to the first registration member, allowing adjustment of the proximal screw bolt position according to different preoperative planning requirements while maintaining stable fixation once positioned

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The jig allows preoperative planning to be performed by adjusting the pivot angle and registration member positions before the actual osteotomy, enabling the surgeon to determine optimal screw bolt positions in advance

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250099110A1Osteotomy assistance jig, digital template, and long bone corrective osteotomy

Publication Date: 2025.03.27 OLYMPUS TERUMO BIOMATERIALS CORP

AI summary

Provided is an osteotomy assistance jig, a digital template, and long bone corrective osteotomy. This osteotomy assistance jig comprises: a first registration member that has a positioning plate serving as a placement reference, and that sets a fixed position of a distal screw bolt; and a second registration member that is connected to the first registration member at an arbitrarily defined pivot angle so as to be capable of pivoting about a pivot axis set on a bone cutting line serving as a reference for cutting, and that sets a fixed position of a proximal screw bolt, wherein the fixed positions of the distal screw bolt and the proximal screw bolt are determined on the basis of the position of the first registration member and the connection position and connection angle of the second registration member with respect to the first registration member.