Redeployable Tissue Retrieval Bag for Serial Specimen Collection
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Solution Overview
Problem
Existing laparoscopic surgery methods face challenges in efficiently capturing and removing tissue specimens, particularly large or multiple specimens, due to limited access and the bulkiness of current devices, which can lead to complications and inefficiencies.
Innovation Solution
A redeployable tissue retrieval system comprising a tubular introducer, actuator, retaining latch, support arms, and a tissue retrieval bag, allowing for serial removal and detachment of specimens through a single port, with features like a bead and cord loop for easy manipulation and closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single laparoscopic port is used to reduce invasiveness, then patient invasiveness is reduced, but tissue removal becomes difficult
Solution Approach 1:
The tissue retrieval bag is nested within the introducer device, allowing the bag to be deployed from the introducer into the abdominal cavity. This nested configuration enables the retrieval system to pass through a single small port while still providing sufficient working space for tissue capture and removal operations
Solution Approach 2:
The retrieval bag transitions from a compact folded state within the introducer to an expanded three-dimensional configuration in the abdominal cavity. This dimensional transformation allows the device to maintain a small profile during insertion through the port while providing ample space for tissue manipulation and removal operations
2Object-affected harmful factors
If tissue is contained quickly with minimal disturbance, then surgical site disturbance is minimized, but device complexity increases
Solution Approach 1:
The actuator, support arms, and retrieval bag are merged into a single integrated assembly that can be deployed as one unit. This consolidation allows the entire retrieval mechanism to be introduced through a single port and deployed simultaneously, minimizing the number of separate device components that would otherwise require multiple insertion points or assembly steps
3Measurement precision
If multiple tissue specimens are removed in series, then diagnostic accuracy is improved, but procedure time increases
Solution Approach 1:
The retrieval bag remains deployed in the abdominal cavity throughout the procedure, allowing multiple tissue specimens to be captured sequentially without requiring removal and reinsertion of the device between specimens. This continuous presence enables uninterrupted serial removal of lymph nodes or other tissue samples for diagnostic analysis
Solution Approach 2:
After capturing a tissue specimen, the bag can be partially collapsed to compact the specimen for removal, then re-expanded to continue capturing additional specimens. This recoverable configuration allows the device to be reused multiple times during a single procedure rather than requiring replacement after each specimen removal
4Device complexity
If a compact single unit device is used, then operating space efficiency is improved, but device functionality is limited
Solution Approach 1:
The retrieval bag transitions dynamically between compact and expanded states, and the support arms can adjust their configuration to accommodate different tissue sizes and shapes. This dynamic adaptability allows a single compact device to perform multiple functions including capturing small biopsies, large tissue specimens, and irregularly shaped structures
Data Source
AI summary
A tissue retrieval system including a tissue retrieval bag deployable by an actuator from an introducer and suspended in an open configuration by support arms can be serially redeployed between a partially or fully stowed configuration and a first deployed configuration to be used in procedures to collect multiple samples. The system can include defeasible proximal and distal stop mechanisms to limit movement of the actuator for serial redeployment. The tissue retrieval system can include a retention latch to couple a bead of the tissue retrieval bag to the actuator with the retrieval bag in the first deployed position and a user-selectable deployment release to allow deployment of the retrieval bag to a fully deployed position where it is released from the actuator. A bead stop is positioned to engage the introducer to prevent reintroduction of the bead and bag into the introducer once the bag has been fully deployed.