Bidirectional Torque-Limiting Driver with Flexible Ramps
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Solution Overview
Problem
Reusable torque-limiting drivers in the medical industry require frequent recalibration to maintain precise torque application, which is cumbersome, while disposable drivers provide reliability but are not reusable.
Innovation Solution
A bidirectional torque-limiting driver with movable torque limiting flex ramps (TLFR) that disengages at a predefined torque limit, allowing for a predetermined number of uses, ensuring precise torque application without the need for recalibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reusable torque-limiting drivers are used, then device cost is reduced and environmental impact is minimized, but the driver requires frequent recalibration to maintain precise torque application
Solution Approach 1:
The patent implements a disposable torque-limiting driver that is pre-calibrated at the factory and discarded after a predetermined number of uses (typically one implant procedure). This eliminates the need for recalibration between uses while ensuring consistent torque application precision. The disposable nature allows the driver to be packaged with the implant, guaranteeing that the torque limiting mechanism has not been compromised or altered.
2Reliability
If disposable torque-limiting drivers are used, then torque application precision is maintained without recalibration, but the driver cannot be reused and must be discarded after each use
Solution Approach 1:
The patent employs a dynamic torque limiting mechanism using flexible ramps that can deflect elastically under load. The ramps are designed to flex and return to their original position, enabling the driver to be reset and reused for multiple procedures. The elastic deformation allows the torque limiting function to be reset without permanent deformation, provided the predetermined torque limit is not exceeded.
3Adaptability or versatility
If a torque limiting mechanism with flexible ramps is used, then bidirectional torque control is achieved, but the structure becomes more complex with movable components
Solution Approach 1:
The patent combines the torque limiting function with the driver shaft structure by integrating flexible ramps directly into the shaft wall. This merging of functions eliminates the need for separate torque limiting components while achieving bidirectional torque control. The ramps are formed as part of the shaft structure, reducing overall device complexity despite the added functionality.
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 bidirectional torque-limiting driver provides reliable and precise torque application in both clockwise and counterclockwise directions, maintaining accuracy and reducing the need for frequent recalibration, making it suitable for surgical environments.
Implementation Method 1
movable torque limiting flex ramps (TLFR) are formed on a wall bisecting said handle... TLFRs can flex in response to the passing of the force head(s) thereover
Data Source
AI summary
A bidirectional torque limiting driver with a handle, internal wall, movable head and a tool mounted thereon, with flexible torque limiting flex ramp(s) formed on said internal wall, whereby said ramps move under sufficient force to impart a predetermined torque to a tip is disclosed.