Medical Screwdriver Tool with Cam-Actuated Split Tip
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Solution Overview
Problem
Existing medical screwdrivers require counter-intuitive force application to secure screws, making the process tedious and risky, especially in medical procedures, due to the asymmetrical split end design which can lead to screws becoming loose or lost.
Innovation Solution
A tool with a driver shaft and actuator that moves between positions to open or close the tip's portions via a cam profile and drive projections, allowing intuitive forward pushing to secure fasteners, reducing the risk of misalignment and screw loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the bushing is moved away from the screw to clamp the screw, then the clamping force is improved, but the user must apply counter-intuitive force which increases operation difficulty and risk of screw loss
Solution Approach 1:
The patent inverts the traditional bushing movement direction. Instead of moving the bushing away from the screw to clamp (as in prior art), the actuator moves toward the tip to engage the cam profile and force the split portions together. This reversal makes the clamping action intuitive - pushing forward to clamp, pulling back to release - eliminating the counter-intuitive force application problem while maintaining strong clamping force
2Ease of operation
If the bushing is pulled back to release the screw, then the screw can be removed, but the force required may outweigh the securing force causing accidental screw loss
Solution Approach 1:
The patent introduces a cam profile as an intermediary mechanism between the actuator and the split portions. The cam profile converts the actuator's linear motion into controlled radial movement of the split portions. During release, the actuator simply pulls back along the cam profile's guide groove, and the cam geometry automatically reduces clamping force progressively, preventing sudden screw loss while ensuring reliable release when fully retracted
3Adaptability or versatility
If the split end design is used to enable screw clamping, then the fastening function is achieved, but the asymmetrical design creates counter-intuitive operation and increases screw loss risk
Solution Approach 1:
The patent applies the inversion principle to the entire clamping mechanism operation. The actuator moves in the same direction as the desired clamping force (toward the tip), rather than opposite to it. The cam profile translates this forward motion into the necessary radial convergence of split portions, making the operation intuitive while maintaining the asymmetrical split design's fastening capability
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 enables intuitive and reliable fastener securing with reduced risk of loss, improving ergonomics and visibility, and is compatible with various fastener sizes through a tapered cam profile and slot design.
Implementation Method 1
the actuator is configured to drive against a cam profile defined by grooves on the driver shaft
Implementation Method 2
the pressure from the contact ring onto the shaft is reduced allowing the two parts of the split end of the shaft to move towards each other due to the elasticity of the material of the shaft
Data Source
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AI summary
There is provided a tool for use with a fastener, more particularly, there is provided a medical screwdriver tool arranged to interact with a fastener. The tool has a driver body with a driver shaft, the driver shaft being associated with a tip configured for interaction with a fastener. The tool also having an actuator arranged for reciprocal movement with respect to a longitudinal axis of the driver shaft between a first position proximal the tip and a second position distal the tip. The tip has first and second portions. The tool is configured for moving said first and second portions from a closed condition to an open condition upon movement of the actuator from said second position to said first position.