Tissue Retrieval Bag with Pleated Fold and Dual Drawstrings
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Solution Overview
Problem
Current tissue retrieval devices are not versatile enough to facilitate morcellation of waste tissue within the retrieval bag and often require multiple instruments and complex deployment procedures, posing risks during surgeries like laparoscopic and natural portal surgeries.
Innovation Solution
A tissue retrieval bag with a pleated fold that can be easily deployed and collapsed using a single motion, featuring a first drawstring for closure and optional secondary openings for a camera or insufflation, and a second drawstring for sealing during morcellation, allowing minimal hardware and effort for tissue harvesting across various surgical modalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a tissue retrieval bag is designed to remain attached to the surgical device, then the bag can be easily deployed and removed, but the bag cannot facilitate morcellation of waste tissue within the retrieval bag
Solution Approach 1:
The bag is divided into two functional parts: a retrieval portion that remains attached to the device for easy deployment and removal, and a separable morcellation portion that can be detached to allow morcellation procedures. This segmentation resolves the contradiction by allowing each part to specialize in its intended function without compromising the other.
Solution Approach 2:
The morcellation capability is extracted as a separate removable component from the main retrieval bag. This allows the bag to maintain its simple attached design for retrieval while enabling morcellation functionality when needed, through the addition of a separate morcellation device that can be introduced into the bag.
2Reliability
If multiple instruments and complex deployment procedures are used, then the bag can be securely deployed and closed, but the procedure requires more hardware and effort
Solution Approach 1:
Multiple functions are merged into a single integrated bag structure: the drawstring closure mechanism simultaneously achieves both sealing and compression of the bag contents, while the pleated design provides both deployment assistance and volume reduction. This merging reduces the number of separate instruments needed while maintaining reliable deployment and closure.
Solution Approach 2:
The bag utilizes parameter changes in its material properties - specifically, the drawstring mechanism changes the physical state of the bag from open to sealed and compressed through a single continuous action. This parameter change approach allows reliable closure without requiring multiple discrete steps or instruments.
3Ease of operation
If the bag opening is fully open for tissue collection, then tissue can be easily placed in the bag, but the bag cannot be easily collapsed for removal through small incisions
Solution Approach 1:
The bag opening is designed to be dynamic rather than static - it can transition between a fully open state for easy tissue collection and a collapsed state for removal. The drawstring mechanism enables this dynamic transformation, allowing the opening to adapt its size based on the operational phase, thus resolving the contradiction between ease of collection and ease of removal.
Solution Approach 2:
The pleated design introduces an additional dimensional aspect to the bag structure. The pleats allow the bag to collapse in on itself, reducing its effective size for removal while maintaining a large opening for tissue collection. This dimensional transformation enables the bag to satisfy both requirements at different times in the procedure.
4Adaptability or versatility
If a second trocar is added to access the interior of the bag for camera or insufflation, then the bag can accommodate different surgical modalities, but the device complexity increases
Solution Approach 1:
The bag is designed with universal features that accommodate multiple surgical modalities without requiring additional access points. The clear material allows for camera visualization from outside the bag, and the insufflation capability works with standard laparoscopic techniques. This universal design approach allows different surgical approaches (laparoscopic, natural portal, etc.) to be used with the same basic device, avoiding the need for a second trocar while maintaining versatility.
Data Source
AI summary
Provided is a tissue retrieval bag. The bag is made primarily of a first material, the bag having a region defining an opening; a pleated fold intersecting the opening. The bag has at least one porthole on at least one side of the bag. The at least one porthole is covered by a second material, the second material being different from the first material. The bag also includes a first hem circumferentially formed around the opening, the first hem forming insertion points adapted to receive a first draw string.