Surgical Tissue Retrieval Pouch with Reversible Jaw Closure
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Solution Overview
Problem
Existing tissue retrieval devices in endoscopic surgery face issues with pouch closure mechanisms that prevent reopening, leading to difficulties in sample collection and removal, as well as pouch failure during extraction due to applied force and contact with sharp instruments.
Innovation Solution
A surgical device featuring a collapsible pouch with laterally biased jaws and a toggle mechanism that allows for repeated deployment, opening, and closing of the pouch, enabling secure attachment and quick release, along with a design that prevents accidental deployment or closure, facilitating tissue collection and manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a drawstring or wire loop is used to close the pouch, then the pouch can be securely closed to prevent spillage, but the pouch cannot be reopened once closed
Solution Approach 1:
The pouch closure mechanism transitions from a static irreversible closure (drawstring/wire loop) to a dynamic reversible closure using a sliding jaw system. The movable jaw can be positioned to either engage with the fixed jaw for secure closure or disengage to allow reopening, enabling the pouch to transition between closed and open states multiple times during the procedure.
2Productivity
If force is applied to pull the filled pouch through the incision, then the tissue can be removed from the body, but the pouch may fail or rip during extraction
Solution Approach 1:
The pouch support structure is segmented into multiple components: a fixed jaw and a movable jaw connected via a rod. This segmentation allows the support structure to flex and adapt during pouch removal, distributing mechanical stress across multiple elements rather than concentrating it on the pouch material alone, thereby reducing the risk of pouch failure.
Solution Approach 2:
The movable jaw can be dynamically repositioned during the extraction process. When resistance is encountered or pouch stress is detected, the movable jaw can be retracted or repositioned to reduce tension on the pouch, allowing the procedure to continue without pouch failure while maintaining extraction progress.
3Ease of operation
If the pouch mouth is made large for easy sample collection, then tissue can be efficiently placed in the pouch, but the pouch becomes harder to control and secure
Solution Approach 1:
The dual-jaw closure system provides dynamic control over the pouch mouth. The movable jaw can be precisely positioned to create an optimized opening size that balances easy sample access with secure closure capability. The jaw mechanism allows the operator to adjust the mouth configuration from fully open for sample placement to securely closed for extraction, managing the trade-off between accessibility and control.
Data Source
AI summary
A surgical tissue retrieval instrument has a collapsible pouch at the distal end of an elongated pusher rod that is introduced into a patient through a cannula. The instrument includes a two-jaw fork that forms a loop when in an unconstrained configuration and that supports the pouch. Deployment and operation of the fork and the pouch are controlled by a securing mechanism. The two jaws and the securing mechanism are slid in a hem surrounding the opening of the pouch when the device is assembled.