Asymmetrical Disposable Torque-Limiting Mount
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Solution Overview
Problem
There is a need for reliable disposable unidirectional torque-limiting devices capable of imparting higher torques for larger applications in the medical industry, as reusable devices require frequent recalibration and sterilization, while traditional disposable drivers are limited to lower torque values.
Innovation Solution
The development of asymmetrical disposable torque-limiting devices with a handle and tool containment interface, featuring a pin guide, actuator with a ball-shaped end, and elastomeric bushing, which applies a predetermined force to limit torque, allowing for unidirectional operation and easy tool swapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reusable torque-limiting drivers are used, then torque precision and reliability are maintained, but frequent recalibration and sterilization are required
Solution Approach 1:
The patent employs a disposable torque-limiting driver that is discarded after a single use or limited number of actuations. This eliminates the need for recalibration and sterilization procedures associated with reusable devices, while maintaining torque precision through factory pre-setting. The disposable nature resolves the contradiction by sacrificing device reusability to gain time efficiency and eliminate maintenance overhead.
2Ease of manufacture
If traditional disposable drivers are used, then sterilization is eliminated, but torque capacity is limited to lower values
Solution Approach 1:
The patent changes the structural parameters of the disposable driver by incorporating an asymmetrical actuator mechanism with a ball-shaped end and complementary cavity. This design modification enables the disposable device to achieve higher torque capacities (up to 20 inch-ounces or more) while maintaining the sterilization-free advantage. The asymmetrical geometry allows for more effective force transmission and torque generation in a disposable format.
3Force
If asymmetrical actuator design is implemented, then higher torque capacity is achieved, but device complexity increases
Solution Approach 1:
The patent implements an asymmetrical actuator design where the actuator body has a non-symmetrical cavity that receives a ball-shaped end. This asymmetry enables unidirectional torque application and higher force capacity. The complexity is managed by integrating the asymmetrical features into the basic actuator geometry rather than adding separate components, thus achieving high torque capacity while keeping the overall device structure relatively simple and suitable for disposable manufacturing.
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
These devices provide reliable, precise torque application over a predetermined number of actuations, eliminating the need for recalibration and sterilization, and enabling higher torque values in a disposable format, enhancing operational efficiency in medical settings.
Implementation Method 1
an elastomeric bushing, which applies a predetermined force to limit torque
Data Source
AI summary
Disclosed are aspects of exemplars of torque-limiting devices, methods and mechanisms exemplars methods may include placing an actuator in a tool containment interface of a handle; movable mounting a tool portion with an actuation catch and a work piece engaging region (WER) in the interface; applying sufficient force to the movable mounting to the handle may be via pins, guides and slots. Said catch may be one of a body catch and a lever catch; and, the actuator terminates on one of a ball shaped end that forms and interface with the body catch and a force lever that forms an interface with the lever catch.