Lead Extraction Tool Lever and Dual Action Drive
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Solution Overview
Problem
Existing lead extraction tools require repeated manual squeezing and releasing to rotate the cutter, leading to hand fatigue and reduced precision in cardiac lead extraction procedures.
Innovation Solution
A rotational sheath lever system and dual pull mechanism that allows the sheath and cutter to rotate bidirectionally during both the squeeze and relax phases, reducing the number of required squeeze cycles and incorporating a lever to concentrate force for more efficient torque delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual squeezing of the trigger is used repeatedly to rotate the cutter, then the lead extraction function is achieved, but hand fatigue and reduced precision occur
Solution Approach 1:
The spring mechanism automatically returns the trigger to its initial position after each squeeze, eliminating the need for manual resetting and reducing operator fatigue while maintaining consistent operational precision
Solution Approach 2:
The trigger assembly is designed to perform periodic squeezing and releasing cycles, with the spring enabling automatic return to initial position, creating a rhythmic operation that reduces fatigue while maintaining precision
2Productivity
If repeated manual squeezing cycles are used to rotate the sheath and cutter, then lead separation is achieved, but time consumption increases
Solution Approach 1:
The spring mechanism ensures continuous rotational action of the sheath and cutter by automatically returning the trigger to its initial position, eliminating idle time between squeeze cycles and maintaining continuous useful action throughout the procedure
Solution Approach 2:
The periodic squeezing and automatic returning of the trigger creates a continuous cycle of cutter rotation, maximizing the productivity of each unit of time spent on the procedure
3Force
If manual trigger squeezing is used to deliver torque to the cutter, then cutting action is achieved, but force efficiency is reduced
Solution Approach 1:
The spring mechanism dynamically converts stored elastic potential energy into kinetic energy during the return stroke, amplifying the force delivered to the cutter during the relaxation phase and improving overall power efficiency
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 solution reduces hand fatigue and enhances precision by allowing similar cutting action with fewer trigger cycles, enabling quicker and easier separation of leads from attached tissues with greater control.
Implementation Method 1
A spring is provided to be engaged with the belt to cause rotation of the sheath and cutter bidirectionally, during both squeezing and relaxing of the trigger assembly
Data Source
AI summary
A lead extraction tool includes a lever for enhanced mechanical advantage. A belt of the tool which causes rotation of a cutter on an end of a sheath can be driven both when a trigger of the handheld tool is squeezed and when the trigger is relaxed. A pair of winged engagers are carried upon a pedestal which moves with the trigger, with a driver coupled to a portion of the trigger causing a rear winged engager or a front winged engager to engage the belt, both when squeezing the trigger and when relaxing the trigger.