Bone Void Sculpting Loops for Precise Hip Implant Cavities

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Solution Overview

Problem

Existing joint arthroplasty methods face challenges in creating a bone void that accurately matches the shape of prosthetic implants, often leading to high mechanical stress and the risk of intraoperative fracture, especially in minimally-invasive procedures.

Innovation Solution

A bone void sculpting instrument with a tool frame and interlocked bone sculpting tools that form continuous loops along non-circular paths, allowing for precise shaping of the bone cavity to match the prosthetic implant, while minimizing mechanical stress and enabling minimally-invasive access.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional bone preparation methods are used, then the bone void can be created with standard access approaches, but the mechanical stress on the bone is high and intraoperative fracture risk increases

Engineering Contradiction:

Improverisk of intraoperative fractureVSAvoidmechanical stress on bone

Core Design Contradiction:

ReliabilityVSStress or pressure

Solution Approach 1:

The bone preparation tool is divided into multiple segmented cutting elements arranged in a circular pattern, allowing distributed cutting action that reduces peak stress concentration compared to single-point cutting methods

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The tool employs a circular arrangement of cutting elements that creates a curved cutting path matching the natural anatomy of the bone void, distributing mechanical stress along the curved interface rather than through straight linear cuts

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Ease of operation

If minimally-invasive approaches are used, then access to the bone is reduced, but creating an accurately shaped bone void becomes more difficult

Engineering Contradiction:

Improveminimally-invasive accessVSAvoidaccuracy of bone void shape

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The bone preparation tool is designed with a universal circular cutting interface that can be inserted through various minimally-invasive access points while maintaining the ability to create accurately shaped bone voids through controlled rotation and engagement of the cutting elements

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The tool replaces complex multi-component mechanical cutting systems with a simplified circular array of cutting elements that achieve precise bone void shaping through rotational motion, enabling accurate preparation through minimally-invasive access

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Manufacturing precision

If the bone void is shaped to match the prosthetic implant, then the implant-bone match improves, but the complexity of the preparation process increases

Engineering Contradiction:

Improvematch between implant and bone voidVSAvoidcomplexity of bone preparation process

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The tool enables precise control of bone void parameters (shape, size, orientation) through adjustment of the circular cutting elements and rotational parameters, allowing customization to match specific implant requirements without excessive process complexity

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260013873A1Device, method, and kit for preparing a bone void for joint replacement

Publication Date: 2026.01.15 KARAS GRP LLC

AI summary

Systems and methods for use of an instrument for preparing a bone for joint replacement is provided. In various embodiments, the instrument comprises a tool frame, a drive interface, a drive shaft, at least one torque interface, and a plurality of bone sculpting tools interlocked to form at least one continuous loop. Methods and systems for preparing a femur for total hip arthroplasty are also provided.