Surgical Bur Flute Layout for Longer Exposure and Rotational Stability
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Solution Overview
Problem
Surgical burs face a challenge in balancing cutting efficiency, stability, and working length, where improvements in one characteristic often negatively affect others, and increasing exposure length leads to instability during axial rotation.
Innovation Solution
The design incorporates primary and auxiliary flutes with specific clearance and rake surfaces and angles, localized to certain regions of the surgical bur, which enhance cutting efficiency and stability without compromising other characteristics, allowing for increased exposure length without instability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the exposure length of the surgical tool is increased to improve visibility and access, then the surgeon can better access the surgical site, but the stability of the surgical tool during axial rotation deteriorates
Solution Approach 1:
The surgical bur incorporates auxiliary flutes localized in specific regions (distal, central, and/or proximal) rather than uniform flutes throughout. This localized differentiation allows the bur to provide enhanced cutting performance in specific areas while maintaining overall structural stability, resolving the contradiction between exposure length and stability.
2Productivity
If auxiliary flutes are added to enhance cutting efficiency in specific regions, then the cutting performance is improved, but the complexity of the surgical bur structure increases
Solution Approach 1:
The surgical bur is segmented into primary flutes that extend from proximal to distal end, and auxiliary flutes localized in specific regions. This segmentation allows the bur to perform multiple functions - the primary flutes provide overall cutting action while the auxiliary flutes enhance cutting efficiency in specific regions, achieving improved productivity without excessive complexity.
3Length of moving object
If the shaft length is increased to provide greater exposure, then the surgeon has better access to the surgical site, but the surgical tool becomes more unstable during operation
Solution Approach 1:
The invention changes the geometric parameters of the surgical bur by incorporating auxiliary flutes with specific configurations in localized regions. This parameter modification enhances the cutting performance and structural characteristics of the bur, allowing for improved exposure length while maintaining stability through optimized flute geometry and distribution.
Data Source
AI summary
A surgical bur including primary flutes and auxiliary flutes. The primary flutes include (i) first clearance surfaces, and (ii) first rake surfaces with first cutting edges. The primary flutes extend from a proximal end of the surgical bur to a distal end of the surgical bur. The auxiliary flutes are localized in central regions or distal regions of the surgical bur. The auxiliary flutes include (i) second clearance surfaces, and (ii) second rake surfaces with second cutting edges. At least one of the auxiliary flutes is located between a pair of adjacent ones of the primary flutes.