Rotating Wire Endoscopic Tissue Resection System

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Solution Overview

Problem

Current endoscopic tissue resection methods, such as using needle knives and biopsy needles, often result in imprecise cutting and a risk of cauterizing healthy tissue, and can lead to 'dry taps' where tissue samples are not properly detached, necessitating a safer and more effective system for tissue resection.

Innovation Solution

A tissue resection system comprising a first tube with a working lumen and a second tube circumferentially positioned around it, with a wire that rotates to incise tissue within the lumen, allowing precise cutting of target tissue while minimizing damage to surrounding tissue, and optionally incorporating electrocautery for cauterization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If needle knife or extended cutting instrument is used to cut tissue, then tissue can be resected, but cutting precision deteriorates and risk of cauterizing healthy tissue increases

Engineering Contradiction:

Improvecutting precisionVSAvoidcauterization of healthy tissue

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The cutting function is segmented from the extended instrument and transferred to a wire that rotates within the working lumen. The wire is guided through a defined path that confines the cutting action to the target tissue only, separating the cutting mechanism from the extended instrument that caused imprecision.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The manual manipulation of extended cutting instruments is replaced by a controlled rotating wire mechanism. The rotation provides consistent cutting motion with precise control, eliminating the imprecision associated with manual extended instrument manipulation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If biopsy needle is used to obtain tissue sample, then tissue can be collected, but dry taps occur where tissue is not properly detached

Engineering Contradiction:

Improvetissue sample collection efficiencyVSAvoidsuccessful tissue detachment

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The simple needle penetration mechanism is replaced by a rotating wire that mechanically cuts and detaches tissue. The rotation provides sufficient mechanical force to cleanly sever tissue attachments, eliminating dry taps caused by inadequate detachment force.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The rotating wire creates vibrational and cutting forces that effectively detach tissue from surrounding structures. This mechanical action ensures complete separation of the tissue sample, preventing dry taps.

Inventive Principle:

Principle #18Mechanical vibration

3Ease of operation

If extended cutting instrument is moved in circular motion, then tissue can be cut, but risk of incising unrelated tissue increases

Engineering Contradiction:

Improvecutting operationVSAvoidincision of unrelated tissue

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The cutting action is extracted from the extended instrument and confined to the working lumen. The wire rotates within the defined space of the working lumen, extracting the harmful potential for unrelated tissue incision by limiting the cutting zone to only the target area.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The cutting function is localized to the working lumen where the wire rotates. The incision of unrelated tissue is prevented by confining the cutting action to the specific local region defined by the working lumen, applying quality control to the spatial distribution of the cutting effect.

Inventive Principle:

Principle #3Local quality

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 system effectively severs only the desired mucosal tissue, reducing the risk of incising surrounding tissue and minimizing 'dry taps, while being faster and more efficient than traditional methods, such as multi-band ligator or injection needle procedures.

Implementation Method 1

rotation of the second tube relative to the first tube causes the wire to pass circumferentially over a distal face of the first tube to incise tissue disposed within the working lumen of the first tube

Methodology Applied

Scientific EffectMechanical cutting: Mechanical Force

Implementation Method 2

the wire may comprise an electrocautery member configured to cauterize a segment of tissue

Methodology Applied

Scientific EffectElectrocautery: Joule Heating

Data Source

PatentUS9089359B2Endoscopic systems and methods for resection of tissue

Publication Date: 2015.07.28 COOK MEDICAL TECHNOLOGIES LLC

AI summary

The present embodiments provide apparatus and methods for facilitating endoscopic resection of tissue. In one embodiment, the apparatus comprises a first tube having proximal and distal regions, and a working lumen disposed within at least a portion of the distal region. A second tube is disposed circumferentially around at least a portion of the distal region of the first tube. A wire has a distal end that is securely attached to a distal region of the second tube. In use, rotation of the second tube relative to the first tube causes the wire to pass circumferentially over a distal face of the first tube to incise tissue disposed within the working lumen of the first tube.