Recessed Bur Bushing Isolates Driveshaft From Tissue Wrapping
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Solution Overview
Problem
High-speed surgical burs experience tissue-wrapping issues due to loose tissue adhering to the driveshaft, leading to increased tension and potential trauma, and heat conduction to sensitive structures during bone abrading.
Innovation Solution
A surgical cutting tool design featuring a bushing partially disposed within a recess of the bur, which reduces exposure of the driveshaft to tissue and incorporates a low-friction material to mitigate heat generation, allowing independent rotation of the driveshaft and bur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driveshaft is exposed to tissue during high-speed rotation, then torque transfer and bur rotation are effective, but tissue adheres to the driveshaft causing tissue-wrapping and increased tension
Solution Approach 1:
A bushing is introduced as an intermediary component between the driveshaft and the bur. The bushing has a first portion that couples to the tube and a second portion that extends into the bur's recess, creating a barrier that prevents tissue from directly contacting and adhering to the driveshaft while allowing torque to be transmitted through the bushing to rotate the bur.
Solution Approach 2:
The bushing is nested within the bur structure, with the second portion of the bushing extending into the recess of the bur. This nested configuration allows the bushing to shield the driveshaft from tissue contact while being integrated within the existing bur assembly, maintaining compactness and functionality.
2Productivity
If the driveshaft rotates at high speed to abrade bone, then cutting effectiveness is achieved, but heat is conducted to sensitive structures causing potential trauma
Solution Approach 1:
The bushing serves as a thermal intermediary between the rotating bur and the stationary tube/driveshaft assembly. By introducing this intermediate layer, heat generated during high-speed bone abrasion is isolated from the driveshaft and surrounding sensitive structures, reducing thermal conduction while maintaining cutting effectiveness.
Solution Approach 2:
The system is segmented into distinct functional zones: the rotating bur for cutting, the bushing as a transitional element, and the stationary tube structure. This segmentation allows the heat-generating component (bur) to be separated from heat-sensitive components (driveshaft, surrounding tissues), enabling effective bone abrasion while minimizing heat conduction to sensitive structures.
3Strength
If the bushing is coupled to the tube within the lumen, then structural support is provided, but the bushing may contact the bur during rotation
Solution Approach 1:
The bushing is nested within the bur's recess, with its second portion extending into the recess but positioned to avoid contact with the bur's outer surface during rotation. This nested arrangement provides structural support through the coupling to the tube while maintaining clearance to ensure smooth rotation without friction or interference.
Solution Approach 2:
The bushing has different functional portions with distinct properties: the first portion is designed for strong coupling to the tube within the lumen, while the second portion extending into the recess is positioned to provide shielding without contact. This local differentiation of function allows the bushing to simultaneously provide structural support and enable smooth rotation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively prevents tissue-wrapping and reduces heat transfer to critical structures, enhancing surgical precision and safety by minimizing tissue adhesion and heat conduction.
Implementation Method 1
incorporates a low-friction material to mitigate heat generation
Data Source
AI summary
A surgical cutting tool for use with a handpiece having a motor is disclosed. The surgical cutting tool comprises a nose tube defining a lumen between proximal and distal ends. A bushing is coupled to the nose tube at the distal end and is disposed at least partially within the lumen. The bushing defines a second lumen configured to receive a region of a driveshaft that extends past the distal end of the nose tube. A bur defines a recess sized to receive at least a portion of the bushing within the recess. The bur is configured to be coupled to the driveshaft within the recess.