Surgical Tissue Retrieval Pouch with Toggle Closure Mechanism
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Solution Overview
Problem
Existing tissue retrieval devices in endoscopic surgery face issues with pouch closure mechanisms that prevent easy collection and removal of samples, as they often require closing the pouch before removal, leading to potential spillage and damage during the process.
Innovation Solution
A surgical device with a collapsible pouch and a toggle mechanism that allows for repeated deployment, opening, and closing of the pouch without locking the mouth, enabling secure attachment and detachment from the support, facilitating tissue collection and pretreatment while preventing accidental deployment or closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a drawstring or wire loop closure mechanism is used to close the pouch, then tissue spillage is prevented, but the pouch cannot be reopened after closing and removal is difficult
Solution Approach 1:
The pouch closure mechanism transitions from a static permanent closure (drawstring/wire loop) to a dynamic reversible closure. The interlocking jaws with toggle mechanism allow the pouch to be opened and closed multiple times during the procedure, providing dynamic control over the closure state while maintaining secure containment when closed.
Solution Approach 2:
The pouch is designed to be discarded (removed from the body) separately from the support structure. The support with jaws and toggle remains in the body while the pouch is extracted, allowing the pouch to be recovered and disposed of after use while the support structure stays in place for potential future use.
2Stability of the object's composition
If the pouch is securely attached to the support, then the pouch remains stable during tissue collection, but the pouch cannot be easily released for removal
Solution Approach 1:
The attachment mechanism between pouch and support transitions from a permanent fixed connection to a dynamic controllable connection. The toggle mechanism allows the surgeon to easily detach the pouch from the support by simple manual operation, providing dynamic control over the attachment state.
Solution Approach 2:
The toggle mechanism serves as an intermediary between the pouch closure system and the support structure. It mediates the connection and detachment process, allowing easy separation of the pouch from the support without requiring complex manipulation or damage to either component.
3Object-affected harmful factors
If a tiny insertion is used for device insertion, then patient trauma is minimized, but the filled pouch cannot be easily removed from the body
Solution Approach 1:
The device is segmented into separate functional components: the support structure with toggle mechanism that remains in the body, and the pouch that is extracted. This segmentation allows the pouch to be removed through a small incision while the larger support structure stays in place, minimizing patient trauma while enabling easy pouch removal.
Solution Approach 2:
The toggle mechanism acts as an intermediary that facilitates the separation and extraction of the pouch through the small incision. By providing a simple detachment mechanism, it enables the pouch to be pulled through the tiny insertion without requiring enlargement of the incision site.
4Ease of operation
If the pouch mouth is kept open for tissue collection, then access to the pouch is improved, but accidental spillage or premature closure may occur
Solution Approach 1:
The interlocking jaw mechanism provides mechanical feedback that ensures proper closure when engaged. The toggle mechanism requires deliberate action to disengage, providing feedback that prevents accidental closure. This feedback system maintains reliability while allowing easy access when intentionally opened.
Solution Approach 2:
The pouch closure mechanism is self-latching through the interlocking jaws and toggle system. Once closed, it automatically maintains its closed state without requiring continuous external force or attention, preventing accidental spillage while allowing easy reopening when needed.
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.