Off-axis Rotary Tool Precession Reduces Reactionary Force
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Solution Overview
Problem
Surgical robots face challenges in handling high force and energy demands during orthopedic surgeries, such as reaming procedures, due to inability to provide sufficient linear force and manage reactionary forces, which can damage robotic components and require surgeon intervention.
Innovation Solution
An off-axis rotary tool with a motor-driven cutting head that simultaneously precesses and rotates, reducing the need for excessive linear force by minimizing frictional load and allowing the tool to advance medially with minimal force, while maintaining control and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a traditional rotary tool is used for reaming, then the cutting function is effective, but high reactionary forces and frictional load are generated that can damage robotic components
Solution Approach 1:
The cutting head is designed to simultaneously precess about a precession axis and rotate about a rotation axis, creating a dynamic motion pattern that reduces frictional load and reactionary forces compared to traditional single-axis rotation
Solution Approach 2:
The tool transitions from single-axis rotation to dual-axis precession and rotation, adding a dimensional aspect to the cutting motion that distributes forces more effectively and reduces peak loads on the robotic system
2Productivity
If traditional rotary tools are used, then cutting action is provided, but excessive linear force is required to advance the tool medially
Solution Approach 1:
The dynamic precession and rotation motion enables the cutting teeth to engage and advance through bone tissue more efficiently, reducing the linear force required to push the tool medially while maintaining effective cutting action
3Productivity
If high linear force is applied to advance the tool, then cutting progress is achieved, but control and precision are compromised
Solution Approach 1:
The simultaneous precession and rotation creates a controlled cutting pattern that progresses medially with minimal force, maintaining precision and control while achieving effective cutting progress
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 off-axis rotary tool effectively reduces reactionary forces on surgical robots and surgeons, enabling efficient orthopedic surgeries with reduced linear force requirements and improved control, allowing the tool to create precise cavities without excess material.
Implementation Method 1
During an operational cycle of the off-axis rotary tool, the cutting head simultaneously precesses about a precession axis and rotates about a rotation axis
Data Source
AI summary
An off-axis rotary tool may include a motor drive and a cutting head having teeth. During an operational cycle of the off-axis rotary tool, the cutting head may simultaneously precess about a precession axis and rotate about a rotation axis.