Rotary Oscillating Bone Removal Tool with Rack-and-Pinion Mechanism
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Solution Overview
Problem
Existing rotary bone, cartilage, and disk removal tool assemblies face issues with fibrous materials wrapping around the cutting tool, causing damage.
Innovation Solution
A rotary oscillating bone, cartilage, and disk removal tool assembly with a housing, motor, spindle, and a rack-and-pinion mechanism or cam-follower mechanism to oscillate the spindle, minimizing damage to fibrous materials by smoothly transitioning velocity and preventing sudden changes in direction or acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rotary cutting tool is used for bone, cartilage, and disk removal, then the cutting operation is effective, but fibrous material wraps around the tool causing damage
Solution Approach 1:
The cutting tool is transformed from a purely rotary motion to a rotary oscillating motion. The oscillation mechanism dynamically adjusts the cutting path to prevent fibrous material from wrapping around the tool, thereby maintaining cutting effectiveness while preventing damage to surrounding tissues.
Solution Approach 2:
The cutting tool implements periodic oscillation in addition to rotation. This periodic back-and-forth motion creates a sweeping cutting pattern that prevents fibrous material from accumulating and wrapping around the tool, solving the reliability issue while preserving productivity.
2Productivity
If the spindle oscillates with high peak angular acceleration, then the cutting operation is more effective, but vibrations increase causing discomfort and potential damage
Solution Approach 1:
The system optimizes the oscillation parameters by limiting peak angular acceleration to less than nine million radians per second squared. This parameter control maintains effective cutting performance while reducing harmful vibrations that cause discomfort and potential tissue damage.
Solution Approach 2:
The oscillation mechanism is designed with predetermined acceleration limits that cushion against excessive vibrations before they occur. By setting the peak angular acceleration threshold in advance, the system prevents harmful vibration levels while maintaining cutting effectiveness.
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 tool assembly effectively removes bone, cartilage, and disk materials while minimizing damage to fibrous materials, reducing vibrations, and providing easier grip during operations.
Implementation Method 1
A rack-and-pinion mechanism is operably driven by the motor and connected to the spindle to oscillate the spindle
Implementation Method 2
A plurality of cams is supported in the housing and driven for rotation by the motor. A plurality of followers is mounted for rotation to the housing, in engagement with the plurality of cams so that one rotation of the plurality of cams oscillates the plurality of followers more than once
Data Source
AI summary
A bone, cartilage, and disk removal tool assembly is provided with a motor mounted in a housing. A spindle is mounted for rotation to the housing. A rack-and-pinion mechanism is operably driven by the motor and connected to the spindle to oscillate the spindle for providing a rotary oscillating cutting operation. According to at least another embodiment, a plurality of cams is supported in the housing and driven for rotation by the motor. A plurality of followers is mounted for rotation to the housing, in engagement with the plurality of cams so that one rotation of the plurality of cams oscillates the plurality of followers more than once while preventing over-rotation of the plurality of followers. A peak angular acceleration of the spindle is less than nine million radians per second squared.