Laparoscopic Tissue Retrieval Bag With Guided Specimen Lifting
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Solution Overview
Problem
Existing laparoscopic tissue retrieval bags struggle to efficiently position tissue specimens close to the minimally invasive incision for effective cutting and removal, often requiring cumbersome manual manipulation and risking damage to the bag during specimen extraction.
Innovation Solution
A retrieval bag equipped with lifting members, such as elastic bands, that can be deployed to lift the closed end of the bag towards the open end, allowing for controlled elevation and positioning of the specimen near the incision, facilitated by a support ring and guide channels to prevent cutting and slipping, and optionally featuring a cinch mechanism for secure closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the retrieval bag is made collapsible to facilitate insertion through minimally invasive incisions, then the ease of operation is improved, but the ability to maintain bag integrity and prevent accidental cutting during specimen extraction deteriorates
Solution Approach 1:
The retrieval bag is divided into two functional states: a collapsed state for insertion through minimally invasive incisions and an extended state for specimen extraction. The collapsible structure allows the bag to transition between these states, maintaining ease of insertion while enabling reliable specimen retrieval when needed.
Solution Approach 2:
The retrieval bag incorporates dynamic characteristics, transitioning from a collapsed configuration during insertion to an extended configuration during specimen extraction. This dynamic behavior allows the bag to adapt to different operational requirements, maintaining both ease of insertion and bag integrity during extraction.
2Ease of operation
If lifting members are added to elevate the closed end toward the open end for controlled positioning, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The lifting members are designed to be self-actuating through the natural collapsing and extending motions of the retrieval bag. As the bag transitions from collapsed to extended state, the lifting members automatically elevate the closed end toward the open end, providing positioning control without requiring additional actuation mechanisms.
Solution Approach 2:
The lifting members are integrated into the bag wall structure itself, merging the positioning function with the bag's structural framework. This integration allows the lifting function to be achieved through the bag's natural motion rather than requiring separate, complex actuation mechanisms.
3Reliability
If guide channels are incorporated to prevent cutting and slipping, then the reliability is improved, but the manufacturing complexity increases
Solution Approach 1:
The guide channels are formed as integral features of the flexible bag wall, utilizing the same thin film material to create both the bag structure and the guide channels. This approach maintains reliability in preventing cutting and slipping while avoiding the complexity of assembling separate guide channel components.
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
Enables efficient and controlled cutting and extraction of tissue specimens by maintaining the bag's integrity and preventing accidental cutting, while allowing for precise manipulation and secure withdrawal through minimally invasive incisions.
Implementation Method 1
the plurality of lifting members are at least partly elastic to thereby apply a continuous lifting force on the closed end of the retrieval bag and the tissue specimen
Data Source
AI summary
A laparoscopic tissue retrieval bag for minimally invasive surgery and comprising a high-strength, biocompatible film wall that is transparent or translucent. The retrieval bag wall is collapsible and crushable for ease of insertion through a laparoscopic cannula. The retrieval bag further comprises a plurality of lifting band or elements in the retrieval bag wall and extending from the open proximal end towards the closed distal end.