Reusable Torque-Limiting Driver with Movable 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 limited to single-use applications.
Innovation Solution
A torque-limiting driver with a hollow body and internal movable ramps that set a predefined torque limit, allowing multiple use with a series of torque-limited tightenings and reversible features, ensuring precise and consistent 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 describes a disposable torque-limiting driver designed for single-use applications. The driver includes a disposable handle with a torque-limiting mechanism and a disposable driver head that attaches to surgical fasteners. After use, the entire driver is discarded, eliminating the need for recalibration while ensuring consistent torque application. The disposable nature allows the device to be pre-calibrated during manufacturing with high precision, and each new driver guarantees the same precision without requiring field recalibration.
2Reliability
If disposable torque-limiting drivers are used, then reliability and precision are ensured without recalibration, but the device is limited to single-use applications only
Solution Approach 1:
The patent describes a torque-limiting mechanism with movable components that allow the driver to function for multiple uses. The handle includes a torque-limiting mechanism with a movable ramp and a spring-loaded detent system that can be reset. The driver head can be detached and reattached multiple times, and the torque-limiting mechanism can be reset between uses by actuating a release mechanism that returns the ramp to its initial position. This dynamic design allows the disposable driver to be reused multiple times while maintaining torque precision.
3Manufacturing precision
If a torque-limiting mechanism is implemented, then precise torque control is achieved, but the device complexity increases
Solution Approach 1:
The patent describes a torque-limiting mechanism that utilizes flexible membrane elements within the handle assembly. The mechanism includes a flexible diaphragm or membrane that deflects under torque load to engage or disengage locking features. This flexible element approach simplifies the overall mechanism compared to rigid mechanical linkages, reducing the number of parts while maintaining precise torque control. The flexible membrane provides a compact, integrated solution that limits torque precisely without requiring complex assemblies.
Data Source
AI summary
A torque limiting device is disclosed, comprising a hollow body with an open proximal end and open distal end forming a handle, an internal wall bisecting said hollow body into a first and a second section on one side having torque limiting movable ramps, a rotatable head section affixed movably to the internal wall with bumps extended from the backside thereof, and a tool mounted to the front side whereby when rotated in a torque limiting direction, the at least one bump stop will pass over the ramp and the application of sufficient torque requirement of said device will depress the ramp, and allow the bump stop to pass over.