Fully Detachable Trocar with Segmented Sealing for Tissue Extraction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing trocars in laparoscopic surgery face issues with inconsistent sealing structures, air leakage, difficulty in handling larger tissues, and risk of cannula dislodgment due to inadequate fixation and design flaws, which hinder surgical efficiency and safety.

Innovation Solution

A fully detachable trocar design featuring multiple sealing components, including a primary and second sealing component with guide plates and barbs for secure fixation, and an air-inflated structure for improved sealing and quick discharge, allowing for various tissue extraction methods and preventing air leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the opening of the sealing plate is made smaller to better cover the surgical device, then sealing performance is improved, but the tissue extraction capability deteriorates as the tissue cannot pass through the sealing plate

Engineering Contradiction:

Improvesealing performanceVSAvoidtissue extraction capability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The sealing structure is divided into two independent detachable components: a sealing plate with a small opening for sealing performance, and a non-return part with a larger opening for tissue extraction. This segmentation allows each component to perform its specific function optimally without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sealing plate can be dynamically detached from the non-return part during surgery. When tissue extraction is needed, the sealing plate is removed to allow the tissue to pass through the larger opening of the non-return part. When sealing is needed, the sealing plate is reattached to provide effective sealing.

Inventive Principle:

Principle #15Dynamics

2Device complexity

If the sealing plates and non-return part are integrated together, then structural simplicity is improved, but the tissue extraction capability deteriorates as the tissue cannot pass through the sealing plate

Engineering Contradiction:

Improvestructural simplicityVSAvoidtissue extraction capability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

3Reliability

If a round hole opening is used in the sealing plate, then sealing performance is improved, but the insertion and pulling resistance increases and recovery speed decreases

Engineering Contradiction:

Improvesealing performanceVSAvoidinsertion and pulling ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The sealing plate employs a lens-shaped opening with different curvature characteristics compared to a standard round hole. The lens shape provides optimal sealing performance while reducing resistance during insertion and pulling operations, and improving the recovery speed of the sealing structure.

Inventive Principle:

Principle #3Local quality

4Ease of manufacture

If the cannula has only unilaterally arranged barbs, then manufacturing simplicity is improved, but the fixation reliability deteriorates as the cannula may divorce from the human body

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidfixation reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The cannula is designed with barbs arranged in both unilateral and bilateral directions, creating an asymmetric fixation pattern that prevents the cannula from slipping or divorcing from the human body. This asymmetric barb arrangement provides superior fixation reliability while maintaining manufacturing feasibility.

Inventive Principle:

Principle #4Asymmetry

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 design enhances surgical efficiency by providing multiple methods for tissue extraction, effectively preventing air leakage, ensuring quick discharge, and stabilizing the trocar during surgery, thus facilitating safer and more efficient operations.

Implementation Method 1

an air-inflated structure arranged on the support and communicated with the channel

Methodology Applied

Scientific EffectAir inflation: Pressure Increase

Implementation Method 2

the external wall of a cannula only has an unilaterally arranged barb

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 3

a plurality of first barbs uniformly arranged at an outer surface of the cannula; and a plurality of reversed second barbs arranged among the first barbs

Methodology Applied

Scientific EffectMechanical Fastener: Mechanical Fastener

Data Source

PatentUS10575871B2Fully detachable trocar

Publication Date: 2020.03.03 UNIMICRO MEDICAL SYST SHENZHEN

AI summary

Disclosed is a fully detachable trocar, comprising: a cannula; a support connected to one end of the cannula; a channel passing through the cannula and the support along an axial direction; an air-inflated structure arranged on the support and communicated with the channel; an air valve for controlling the air-inflated structure to turn on and off; a primary sealing component for sealing when a device is used; and a second sealing component for sealing when no device is used; the primary sealing component, the second sealing component and the support are connected in a sealing manner from top to bottom in sequence, and the primary sealing component can be independently separated from the second sealing component which can be independently separated from the support, so as to provide multiple methods for taking out tissues.