Feature-Based Orthopedic Cutting Instrument Design for Bone Integrity
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Solution Overview
Problem
Existing bone cutting instruments for shoulder arthroplasty, such as glenoid reamers, face challenges in balancing bone removal efficiency with the preservation of bone integrity and instrument durability, often leading to high torque requirements, instrument failure, and bone fracture, particularly in cases of poor bone quality or unfavorable bone shape.
Innovation Solution
A feature and analysis-based design scheme that leverages computational and empirical methodologies, incorporating machine learning and simulations, to optimize cutting instrument parameters such as blade curvature, notches, and angles, reducing stress on both the bone and the reamer, and minimizing torque requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional reamer designs with straight blades are used, then bone removal can be achieved, but torque requirements increase and instrument failure risk increases
Solution Approach 1:
The patent applies curvature to the reamer blades, transitioning from traditional straight blades to curved blades that follow the contour of the glenoid cavity. This curvature allows the reamer to remove bone more efficiently while distributing mechanical stresses more evenly along the blade length, reducing peak stresses that would otherwise cause instrument failure. The curved geometry enables better engagement with the bone surface while maintaining lower torque requirements.
2Productivity
If aggressive bone removal is performed, then bone removal efficiency improves, but bone integrity is compromised and fracture risk increases
Solution Approach 1:
The patent implements varying blade geometries at different locations along the reamer shaft. The cutting edges are designed with specific curvatures and angles optimized for their local position, allowing aggressive bone removal in certain areas while preserving bone integrity in others. The blades are configured to remove bone efficiently where needed while maintaining lower stress concentrations to prevent fracture, creating a localized optimization of cutting performance versus bone preservation.
Solution Approach 2:
The patent employs computational modeling to optimize various geometric parameters of the reamer blades, including curvature radius, blade angle, and cross-sectional dimensions. By systematically varying these parameters and analyzing the results through finite element analysis, the design achieves optimal balance between bone removal efficiency and bone strength preservation, preventing fracture while maintaining high productivity.
3Productivity
If high forces are applied during reaming, then bone removal efficiency improves, but bone fracture risk increases
Solution Approach 1:
The curved blade design distributes the applied forces along the arc of the blade rather than concentrating them at a single point. This curvature allows the reamer to achieve effective bone removal through a more gradual engagement and cutting action, reducing peak forces applied to the bone while maintaining removal efficiency. The distributed force application prevents stress concentrations that would lead to fracture.
4Ease of manufacture
If reamer design does not account for patient-specific factors, then manufacturing is simplified, but surgical outcomes are compromised
Solution Approach 1:
The patent incorporates patient-specific factors into the reamer design process through preoperative planning and computational modeling. Patient anatomy, bone quality, and surgical goals are analyzed before finalizing the reamer geometry. This preliminary customization allows the reamer to be optimized for each patient's specific requirements, improving surgical outcomes while the modular design approach keeps manufacturing relatively simple through standardized manufacturing processes with variable parameters.
Data Source
AI summary
Illustrated and discussed examples include a method of designing a cutting instrument for removing a portion of a bone of a patient. The method can include: receiving with a computing device, bone data; receiving with the computing device, operation data regarding one or more operating parameters for the cutting instrument; receiving a first plurality of device design parameters for the cutting instrument; performing a first analysis using the first plurality of device design parameters for the cutting instrument, the bone data and the operation data; altering one or more of the first plurality of device design parameters to a second plurality of device design parameters for the cutting instrument; performing a second analysis using the second plurality of device design parameters, the bone data and the operation data; and outputting a design of the cutting instrument after performing at least the first analysis and the second analysis.