Tissue Retrieval Bag with Reinforced Sidewalls
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Solution Overview
Problem
Current endoscopic surgery tissue retrieval devices lack efficient mechanisms for deploying and retrieving tissue specimens through small openings, often requiring complex instruments and procedures that can be cumbersome and prone to inadvertent retraction or premature opening/closure.
Innovation Solution
The development of a tissue retrieval device featuring a translatable rod with a resilient hoop member and introducer tube, allowing for staged actuation and secure deployment of a retrieval bag, which can be easily opened and closed within a patient, facilitating the removal of specimens through small incisions or ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a tissue retrieval pouch is used to remove tissue through a small opening, then the incision size is reduced, but the device complexity increases due to the need for specialized instruments for introducing, opening, positioning, and closing the pouch
Solution Approach 1:
The patent combines the introducing, opening, positioning, and closing functions into a single integrated tissue retrieval device. The pouch is pre-attached to the introducer assembly, and the actuating rod provides unified control for deployment and retrieval, eliminating the need for multiple separate instruments.
Solution Approach 2:
The tissue retrieval device is designed to perform multiple functions: introducing the pouch through the incision, deploying the pouch, positioning it at the surgical site, closing it around tissue, and retrieving it. This multi-functional design reduces the number of separate instruments needed while maintaining small incision benefits.
2Reliability
If a complex instrument system is used for tissue retrieval, then the pouch can be securely deployed, but the ease of operation decreases due to cumbersome procedures and risk of inadvertent retraction or premature opening/closure
Solution Approach 1:
The device employs dynamic, staged actuation through the actuating rod that can be progressively advanced to control pouch deployment. The system transitions from a retracted state to a deployed state in controlled stages, allowing the surgeon to adjust the degree of deployment based on tissue size and surgical needs, thereby improving both reliability and ease of operation.
Solution Approach 2:
The pouch is designed with self-contained features including integrated closure mechanisms and positioning structures that automatically engage during deployment. The actuating rod system provides inherent control that prevents inadvertent retraction or premature opening/closure, reducing the need for complex external control mechanisms.
3Adaptability or versatility
If the retrieval bag is made stretchable to accommodate varying tissue sizes, then the adaptability increases, but the manufacturing precision requirements increase due to the need for controlled stretching properties
Solution Approach 1:
The pouch is manufactured with specific elastomeric properties that allow it to stretch and expand to accommodate varying tissue sizes. The material parameters are carefully selected to provide controlled elasticity, enabling the pouch to adapt to different specimen volumes while maintaining structural integrity during retrieval.
Solution Approach 2:
The pouch utilizes composite material construction combining elastomeric properties for stretchability with reinforcing elements to control the stretching behavior. This composite structure allows the pouch to accommodate varying tissue sizes while maintaining predictable mechanical properties and manufacturing consistency.
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 solution enables secure and controlled deployment and retrieval of tissue specimens, reducing the risk of retraction errors and enhancing the ease of use during endoscopic procedures, thereby improving surgical efficiency and patient recovery times.
Implementation Method 1
the pouch is stretchable to accommodate varying sizes of tissue
Data Source
AI summary
A tissue retrieval device includes a tubular member, one or more frame members, and a tissue retrieval bag. The tubular member is insertable into a patient through a trocar to open the bag within the patient to receive a tissue specimen. The internal capacity provided by the bag may vary based on the longitudinal position of the frame members. The bag may be stretchable to increase its internal capacity. At least one sidewall of the bag may include one or more reinforcement members, which may influence the way in which the bag stretches by restricting stretching of the bag in one or more directions while freely permitting stretching of the bag in one or more other directions. Part of the undeployed bag may be contained in a recess formed in the side of the tubular member, with a removable cap being positionable over the undeployed bag and recess.