Open Loop Polypectomy Snare With Adjustable Hemi-Loops

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Solution Overview

Problem

Existing closed loop snares face difficulties in encircling large polyps, particularly pedunculated polyps, which prevents effective cauterization and removal, leading to increased procedural risk and time consumption, especially for sessile polyps in challenging anatomical locations.

Innovation Solution

An open loop polypectomy snare system with adjustable hemi-loops that can be controlled to encircle lesions, featuring a handle-activated mechanism for opening and closing, allowing for variable loop sizes and configurations to accommodate diverse polyp shapes and sizes, and optionally incorporating electrosurgical capabilities for tissue cutting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If closed loop snares are used to remove polyps, then polyp removal is achieved, but large pedunculated polyps cannot be effectively encircled and cauterized

Engineering Contradiction:

Improveability to encircle polyps of varying sizesVSAvoiddifficulty in seating snare loop around polyp base

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The snare loop is divided into two separate hemi-loops that can be independently manipulated and positioned. This segmentation allows each hemi-loop to be separately advanced and configured to match the specific size and shape of the polyp, enabling effective encirclement of large pedunculated polyps that cannot be accommodated by a fixed closed loop snare.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The hemi-loops are designed to be dynamically adjustable in length and configuration during the procedure. The operator can advance or retract each hemi-loop independently to optimize the loop size and shape for capturing polyps of varying dimensions, providing adaptability while maintaining ease of operation through simple proximal control.

Inventive Principle:

Principle #15Dynamics

2Productivity

If conventional closed loop snares are used for large sessile polyps, then polyp removal is attempted, but thermal injury or perforation risk increases

Engineering Contradiction:

Improvepolyp removal efficiencyVSAvoidthermal injury or perforation risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The hemi-loops can be independently adjusted to create a customized loop configuration that precisely matches the local anatomy of the polyp and surrounding tissue. This local adaptation allows the snare to apply cauterization energy only where needed at the polyp base, minimizing thermal spread to adjacent healthy tissue and reducing perforation risk while maintaining removal efficiency.

Inventive Principle:

Principle #3Local quality

3Reliability

If difficult polyps are removed piecemeal over several procedures, then complete removal is achieved, but procedural risk increases and time consumption increases

Engineering Contradiction:

Improvecomplete polyp removalVSAvoidnumber of procedures required

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The open loop snare system with adjustable hemi-loops provides a universal solution that can accommodate various polyp types (pedunculated and sessile), sizes, and anatomical locations within a single procedure. This multi-functionality eliminates the need for multiple separate procedures or piecemeal removal strategies, achieving complete removal in one session and reducing overall procedural time and risk.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Device complexity

If fixed size closed loop snares are used, then device simplicity is maintained, but adaptability to different polyp sizes and shapes is reduced

Engineering Contradiction:

Improvesnare structure simplicityVSAvoidaccommodation of diverse polyp configurations

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The snare employs dynamic hemi-loops that can be independently advanced and retracted through the sheath from the proximal handle. This dynamic design allows the operator to adjust the loop size and shape in real-time to match different polyp configurations, achieving high adaptability while maintaining relatively simple device structure through telescopic movement within the sheath.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20240074774A1Endoscopic open wire snare system

Publication Date: 2024.03.07 KESAR VARUN

AI summary

An embodiment relates to a product comprising an open loop polypectomy snare comprising: a) a handle; b) a tubular sheath having proximal and distal ends, said distal end defining a longitudinal axis; c) a snare wire having a first end and a second end extending from cavity of the tubular sheath and relatively movable with respect to the tubular sheath, wherein the first end is attached to the handle, d) at least two snare hemi-loops attached to the second end of the snare wire, wherein said hemi-loops configured to advance and recede inside the tubular sheath such that said hemi-loops are in close form inside the tubular sheath and when said hemi-loops advance from the tubular sheath, they open to encircle a matter of choice and join at a joint to form a close loop to resect the matter of choice; and wherein movement of said hemi-loops from the tubular sheath and/or opening and closing of said hemi-loops are controlled by the handle; wherein the polypectomy snare is configured for removal of a polyp in endoscopic resection.