Tissue Retrieval Device With Ratchet Bag Closure
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Solution Overview
Problem
Laparoscopic surgery faces challenges in efficiently retrieving tissue from body cavities due to limited space and the complexity of existing devices, which can lead to infection or contamination issues if tissue is not properly contained and removed.
Innovation Solution
A tissue retrieval device comprising an actuator, a tissue bag with a cord and guide bead, and a ratchet mechanism that allows for deployment, closure, and withdrawal of the specimen bag through a trocar, ensuring containment and minimization of disturbance to the surgical site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a tissue retrieval device is designed to be compact and simple, then device complexity is reduced and ease of operation is improved, but the ability to securely contain and withdraw tissue may be compromised
Solution Approach 1:
The tissue bag is nested within the retrieval device, allowing the bag to be stored inside the device body when not in use. The bag can be deployed from the device through the trocar, and both the bag and device can be withdrawn together as a single unit, maintaining secure tissue containment while minimizing device complexity and space requirements.
Solution Approach 2:
A cord is used as an intermediary element to connect the tissue bag to the retrieval device. The cord allows for the deployment and closure of the bag through mechanical action at the proximal end, while maintaining a simple and compact overall device structure. The cord transmits force from the user's manipulation of the device to the bag, enabling reliable tissue containment without complex mechanisms.
2Reliability
If existing retrieval devices are used, then tissue containment is achieved, but the limited space in operating rooms and access ports makes removal difficult
Solution Approach 1:
The tissue bag and retrieval device are merged into a single integrated unit that can be withdrawn together through the trocar. This eliminates the need to separately remove the bag and device, simplifying the removal process and reducing the space required in the operating room. The integrated design allows the entire assembly to be pulled out as one compact unit through the limited access port.
Solution Approach 2:
The retrieval device is designed with a separable structure where the tissue bag can be deployed from the device body, but both components remain connected through the cord. This segmentation allows the bag to be positioned within the body cavity while the device remains accessible for withdrawal, facilitating easy removal through the trocar without compromising tissue containment.
3Productivity
If tissue is not properly contained and removed, then surgical procedure simplicity is maintained, but infection and contamination issues arise
Solution Approach 1:
The tissue bag is designed as a disposable, single-use component that is discarded after containing the tissue specimen. This eliminates the need for cleaning and sterilization of the bag, reducing the risk of infection and contamination. The bag is inexpensive and can be easily replaced, maintaining surgical efficiency while preventing harmful factors associated with reusable contaminated equipment.
Solution Approach 2:
The tissue bag acts as an intermediary barrier between the tissue specimen and the surgical environment. By containing the tissue within a sealed bag, the risk of contamination and infection is prevented. The bag can be easily manipulated and withdrawn through the trocar, maintaining surgical efficiency while protecting the surgical site from harmful factors.
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
The device effectively captures and removes tissue specimens with minimal disturbance, preventing contamination and facilitating quick withdrawal, while the ratchet mechanism ensures secure deployment and closure of the specimen bag, enhancing operational efficiency in laparoscopic procedures.
Implementation Method 1
A guide bead frictionally coupled to the cord
Implementation Method 2
A ratchet is connected to the actuation rod and is movable between a first and a second position. The ratchet in the first position is arranged to allow the bag to be moved from the stored position to the deployed position as the actuation rod is moved in the distal direction and restrict movement of the actuation rod in the proximal direction.
Data Source
AI summary
The tissue retrieval system deploys a tissue bag at the surgical site. The bag is supported by the system as tissue is placed within the bag and is closed to isolate the collected tissue and allow the bag and collected tissue to be removed from the body. The bag can be reopened and re-closed as desired through use of a guide bead and cord. The bead also facilitates removal of the collected tissue.