Tissue Ligation Device Hook Mechanism for Secure Knot Formation

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Solution Overview

Problem

In minimally invasive surgical procedures using endoscopes or laparoscopes, forming secure knots with suture threads is challenging due to the difficulty in handling and binding the threads, which can lead to complications if the knots loosen.

Innovation Solution

A tissue ligation device featuring a hook-like member with a connecting portion and a groove that engages the suture thread, assisted by a direction regulating part to stabilize the thread and form a secure loop, allowing for easy knot formation and prevention of thread disengagement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a suture thread is used for tissue ligation in minimally invasive procedures, then the procedure can be performed using endoscope or laparoscope, but the handling and binding of the thread becomes difficult

Engineering Contradiction:

Improveadaptability to minimally invasive proceduresVSAvoidease of handling and binding thread

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The hook-like member serves as an intermediary tool that facilitates the handling and binding of the suture thread. The groove on the hook-like member engages with the suture thread, providing a mechanical advantage for forming knots and securing the thread during minimally invasive procedures, thereby resolving the difficulty in thread handling while maintaining adaptability to endoscopic and laparoscopic approaches.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a knot is formed to secure tissue ligation, then the ligation is strengthened, but the complexity of the procedure increases

Engineering Contradiction:

Improvesecurity of tissue ligationVSAvoidcomplexity of knot formation

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The hook-like member with groove acts as a mediator that simplifies knot formation. The groove engages the suture thread to form a loop, and the linear part regulates the thread direction, making knot formation straightforward while ensuring secure tissue ligation, thus achieving both reliability and reduced procedural complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The hook-like member pre-forms a loop by engaging the suture thread in its groove, which simplifies the subsequent knot-tying process. This preliminary loop formation reduces the steps required to create a secure knot, thereby decreasing procedural complexity while maintaining ligation security.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If multiple knots are formed to secure tissue, then the ligation reliability is improved, but the time required for the procedure increases

Engineering Contradiction:

Improvereliability of tissue ligationVSAvoidprocedure time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The hook-like member pre-forms loops by engaging the suture thread in its groove, which significantly accelerates the knot-tying process. This preliminary loop formation allows multiple knots to be formed quickly and efficiently, thereby maintaining high ligation reliability while minimizing the time required for the procedure.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9414836B2Tissue ligation device

Publication Date: 2016.08.16 OLYMPUS CORPORATION(JP)

AI summary

Provided is a tissue ligation device for ligating tissues. The tissue ligation device includes a suture thread, and a hook-like member having a connecting portion connected to a suture thread-side of the connecting portion of the suture thread and a groove whose inner wall has a locking surface disposed so as to face the suture thread-side connecting portion and allowed to be brought into contact with the suture thread.