Osteotome Blade With Non-Planar Gripping Portion
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Solution Overview
Problem
Current orthopedic surgical tools lack convenience, ease of access to surgical sites, and optimal geometric properties for efficient bone cutting.
Innovation Solution
A blade design comprising a planar cutting portion, a three-dimensional transition portion, and a non-planar gripping portion, along with a chuck system for secure retention, which reduces stress concentration and enhances bending stiffness for improved cutting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional planar blade design is used, then the blade structure is simple and easy to manufacture, but the bending stiffness is insufficient and stress concentration occurs during bone cutting
Solution Approach 1:
The blade transitions from a conventional two-dimensional planar structure to a three-dimensional structure with varying cross-sectional geometries along its length. The cutting portion has a first cross-sectional geometry optimized for cutting, the middle portion has a second cross-sectional geometry for stress distribution, and the handle portion has a third cross-sectional geometry for handling. This dimensional evolution increases bending stiffness and reduces stress concentration without excessive complexity.
Solution Approach 2:
Different portions of the blade are designed with locally optimized cross-sectional geometries tailored to their specific functional requirements. The cutting portion features a geometry optimized for bone engagement and cutting efficiency, the middle portion has a geometry that distributes bending stresses, and the handle portion has a geometry optimized for surgeon grip and control. This localized optimization improves overall performance while maintaining manufacturing feasibility.
2Stress or pressure
If the blade has a uniform cross-sectional geometry throughout, then the manufacturing process is simplified, but stress concentration occurs during bone cutting operations
Solution Approach 1:
The blade employs a three-dimensional variable cross-sectional geometry where the shape and dimensions of each cross-section change along the longitudinal axis. This dimensional variation allows stress distribution to be optimized at different locations - with broader sections at stress-prone areas and narrower sections where less strength is required - thereby reducing stress concentration while remaining manufacturable through conventional processes.
Solution Approach 2:
Each portion of the blade is designed with a cross-sectional geometry specifically tailored to its functional demands and stress conditions. The cutting portion has a geometry that concentrates strength at the cutting edge, the middle portion has a geometry that distributes bending loads, and the handle portion has a geometry optimized for mechanical attachment. This local optimization reduces stress concentration without requiring complex manufacturing.
3Volume of moving object
If the cutting portion is made thinner to reduce incision size, then the surgical access is improved, but the bending stiffness of the blade is reduced
Solution Approach 1:
The blade is designed with a gradient of cross-sectional geometries where the cutting portion has a smaller, thinner cross-section optimized for minimal incision size and precise bone cutting. As the blade extends toward the handle, the cross-sectional geometry progressively increases in size and thickness to provide the necessary bending stiffness and structural support. This local optimization allows the cutting end to be thin for surgical access while the proximal end provides structural rigidity.
Solution Approach 2:
The blade transitions from a thin cross-section at the cutting portion to a thicker cross-section at the handle portion through a three-dimensional geometric evolution. This dimensional change along the longitudinal axis enables the blade to maintain flexibility and precision at the cutting end while providing sufficient stiffness and strength at the handle end for controlled operation and secure attachment to the osteotome device.
Data Source
AI summary
A blade for use in an osteotome or other cutting device. The blade may have, in sequence, a cutting portion, a transition portion, and a gripping portion, with the transition portion being located between the cutting portion and the gripping portion. The cutting portion may be planar and have at least one cutting edge. The gripping portion may be non-planar. The transition portion may be smoothly contoured. The non-planar nature of the gripping portion may provide increased rigidity of the blade. All of the blade may have uniform thickness of material. Also provided may be a chuck for gripping the blade. The chuck may have an upper nest and a lower nest that in combination closely fit around the gripping portion. The chuck may have a movable pin that locks the gripping portion into the chuck. A portion of the chuck may be spring-loaded.