Thread-like Cutting Element for Kerf-less Ligament Transection

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Solution Overview

Problem

Current surgical methods for carpal tunnel syndrome, such as open and endoscopic procedures, cause significant tissue disruption and trauma, leading to prolonged healing times and potential nerve damage due to the use of incisions, saws, and abrasive cutting surfaces.

Innovation Solution

A minimally invasive method using a thin, flexible thread-like cutting element routed around the transverse carpal ligament with a retrieval tool, allowing for a smooth kerf-less cut without incisions, minimizing tissue disruption, and employing a cutting element with high tensile strength and a smooth surface for precise transection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If open or endoscopic surgical methods are used to transect the transverse carpal ligament, then the ligament can be severed to relieve pressure on the median nerve, but significant tissue disruption and trauma occur leading to prolonged healing times and potential nerve damage

Engineering Contradiction:

Improveligament transection effectivenessVSAvoidtissue disruption and trauma

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts the cutting function from traditional surgical instruments (scalpels, saws) and transfers it to a flexible cutting element that can be routed through the carpal tunnel without requiring large incisions or complex instrument insertion. This allows the ligament to be cut while minimizing contact with and damage to surrounding healthy tissue.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs a flexible cutting element (such as a thin wire or filament) that can be routed through the carpal tunnel space and around the ligament. This flexible element cuts the ligament with minimal tissue disruption compared to rigid surgical instruments, reducing trauma to surrounding structures while maintaining cutting effectiveness.

Inventive Principle:

Principle #30Flexible shells and thin films

2Ease of operation

If traditional surgical incisions and instruments are used, then the transverse carpal ligament can be accessed and cut, but the procedure causes tissue trauma and requires prolonged healing

Engineering Contradiction:

Improveligament accessibilityVSAvoidhealing time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

Instead of bringing large cutting instruments in through incisions to cut the ligament, the patent inverts the approach by routing a flexible cutting element through the natural carpal tunnel space and using it to cut the ligament from within. This reverses the traditional sequence of accessing then cutting, allowing minimal access with maximal effect.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The flexible cutting element serves as an intermediary that can be introduced through minimal access points, routed to the target ligament, and used to perform the cutting function. This intermediary approach avoids the need for large incisions and complex instrument manipulation while achieving the same surgical goal.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Manufacturing precision

If saw-like instruments are used to cut the ligament, then the ligament can be transected, but a kerf is created with rough cut surfaces that increase inflammatory response and scarring

Engineering Contradiction:

Improvecut precisionVSAvoidinflammatory response and scarring

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent replaces the mechanical sawing action that creates kerfs and rough surfaces with a different cutting mechanism using a flexible element. This substitution produces a smoother cut surface that generates less tissue debris and triggers a reduced inflammatory response, thereby minimizing scarring and adhesions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the cutting parameters by using a flexible element with different mechanical properties compared to traditional saws or scalpels. The flexible element creates a cleaner cut with less mechanical trauma to the tissue edges, altering the cutting characteristics to reduce harmful inflammatory responses and improve healing outcomes.

Inventive Principle:

Principle #35Parameter changes

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

This approach reduces trauma to surrounding tissues, minimizes scarring, and significantly shortens recovery time by enabling precise, smooth cutting with minimal risk to nerves, achieving a kerf-less transection of the ligament.

Implementation Method 1

Methodology Applied

Scientific EffectTensile strength: Tension

Data Source

PatentUS9381033B2Method and apparatus for thread transection of a ligament

Publication Date: 2016.07.05 GUO JOSEPH

AI summary

A method and apparatus for transecting soft tissue, such as a ligament, and more particularly, the transverse carpal ligament. A retrieval tool and a threadlike cutting element enable the method to performed in a minimally invasive manner. The cutting element is routed into position about the target ligament such that the cutting element both enters and exits the body from the same side of the ligament. The smooth exterior surface of the cutting element serves to provide for a kerf-less cut.