Spring-Loaded Loop Member for Tissue Engagement
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Solution Overview
Problem
Existing deployable snares with fixed loop diameters fail to maintain continuous force on tissue over time as tissue necroses or changes shape, leading to premature disengagement.
Innovation Solution
A deployable segment with a spring member that adjusts the loop's diameter to maintain continuous compression around the tissue, ensuring engagement even as tissue shape changes, using a cannula and stylet arrangement for delivery and adjustable loop sizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed diameter loop is used, then the device structure is simple, but the loop cannot maintain continuous force on tissue as tissue shape changes
Solution Approach 1:
The loop member is designed with dynamic adjustability through a spring mechanism that allows the loop diameter to change automatically in response to tissue shape changes during necrosis, maintaining continuous engagement and force application without requiring complex active control systems
Solution Approach 2:
The spring member enables the loop diameter parameter to change dynamically as tissue necroses and shrinks, allowing the loop to maintain optimal engagement force throughout the treatment process by adapting to changing tissue dimensions
2Duration of action of moving object
If a fixed configuration loop is used, then the manufacturing is simple, but the loop prematurely falls off as tissue necroses
Solution Approach 1:
The spring-loaded loop member provides dynamic adaptation to tissue shrinkage during necrosis, extending the duration of effective engagement by automatically adjusting to changing tissue dimensions without requiring complex manufacturing processes
Solution Approach 2:
The spring mechanism provides self-adjusting functionality that automatically maintains loop engagement as tissue necroses, eliminating the need for manual readjustment or complex control systems while extending the effective duration of action
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 spring member ensures the loop member maintains engagement with the tissue over time, preventing premature disengagement due to tissue necrosis or shape changes, allowing for sustained force application.
Implementation Method 1
a spring member is disposed between the cannula and the loop member. The proximal end of the spring member is affixed to the cannula, and the distal end of the spring member is movable to apply a compressive force
Data Source
AI summary
The present embodiments provide apparatus and methods for treating tissue by applying a force to the tissue. In one embodiment, the apparatus comprises a deployable segment having proximal and distal regions, a main body extending therebetween, and a loop member formed at the distal region of the deployable segment. A cannula having a bore is dimensioned to circumferentially surround at least a portion of the main body at a location proximal to the loop member, and a spring member is disposed between the cannula and the loop member. The proximal end of the spring member is affixed to the cannula, and the distal end of the spring member is movable to apply a compressive force to adjust the size of the opening of the loop member and compress tissue disposed within the opening of the loop member. In an alternative embodiment, the cannula is omitted, and a diameter of the loop member is configured to be reduced and increased any number of times before final deployment of the deployable segment.