Endoscopic Access System with Independent Extraction Bag Pressurization
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Solution Overview
Problem
During endoscopic operations, the positive pressure in the body cavity compresses extraction bags containing infectious tissue, making it difficult to cut and remove tissue fragments using a morcellator, and there is a risk of cutting the bag or re-introducing tissue into the body cavity.
Innovation Solution
An access system comprising a trocar, a cover, and spreading elements that allow the extraction bag to be expanded independently, using a fluid feed to maintain counterpressure and prevent bag compression, enabling safe cutting and removal of tissue fragments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the body cavity is insufflated with gas to expand operating space, then the surgeon is provided with more operating space, but the extraction bag containing detached diseased tissue is compressed so much that it is difficult or impossible to detach small pieces of tissue with the morcellator and remove them
Solution Approach 1:
The invention introduces a separate fluid feed system that can independently insufflate the extraction bag with gas, segmenting the pressure control from the body cavity insufflation. This allows the bag to maintain its own internal pressure to counteract compression from the positive body cavity pressure, enabling the morcellator to freely detach and remove tissue pieces without the bag being compressed
Solution Approach 2:
The invention uses a fluid feed as an intermediary mechanism to introduce gas into the extraction bag, creating a counterpressure system that mediates between the body cavity insufflation and the bag contents. This intermediary gas injection system allows the bag to resist compression while maintaining its containment function
2Area of stationary object
If the body cavity is insufflated with gas to expand operating space, then the surgeon is provided with more operating space, but there is a risk of the rotating blade of the morcellator cutting the extraction bag itself and parts of the infectious tissue passing back into the body cavity
Solution Approach 1:
By independently insufflating the extraction bag with gas through a separate fluid feed, the invention creates a pressurized containment environment that segments the bag contents from the body cavity. This independent pressure system ensures the bag remains expanded and intact, preventing the morcellator blade from cutting through the bag and eliminating the risk of infectious tissue passing back into the body cavity
Solution Approach 2:
The invention applies beforehand cushioning by pre-insufflating the extraction bag with gas through the fluid feed before morcellation begins. This creates a protective gas cushion that maintains bag expansion and structural integrity, preventing the rotating blade from contacting or cutting the bag during the morcellation process
3Productivity
If a morcellator is used to cut up large pieces of tissue in the extraction bag, then smaller pieces can be removed from the body cavity, but tiny remnants of diseased tissue could remain in the body during the cutting up process
Solution Approach 1:
The invention enhances the containment function by independently insufflating the extraction bag, effectively taking out and isolating all tissue processing activities from the body cavity environment. This ensures that even tiny remnants of diseased tissue remain confined within the pressurized bag during morcellation, preventing any disease spread while maintaining efficient tissue removal
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 access system effectively expands the extraction bag, allowing safe morcellation and removal of tissue fragments without risking tissue re-introduction into the body cavity, while maintaining equivalent insufflation pressure to the body cavity.
Implementation Method 1
the insufflation gas can be fed via a distribution valve such that the insufflation pressure in the body cavity and in the extraction bag is maintained at the same or at least similar level
Data Source
AI summary
An access system for endoscopic operations includes of a trocar, a cover that is fittable on the trocar and at least one spreading element having a retaining portion and an effector portion, wherein the access system has, between the trocar and the cover in the fitted state, a receiving region for the retaining portion of the at least one spreading element. Furthermore, the access system can include an extraction bag which is expanded by the effector portion of the at least one spreading element.