Filter Retrieve Bag for Large Tissue Removal Through Endoscopes
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Solution Overview
Problem
Existing tissue retrieval devices struggle to reliably capture large tissue pieces from liquid-filled body cavities without leaving scraps or cells behind and efficiently remove them through narrow access paths like an endoscope's working channel.
Innovation Solution
A retrieve device with a hydrophilic water-permeable filter diaphragm and flexible sidewalls, allowing the bag to shrink by expelling liquid, enabling large tissue pieces to be captured and removed through a narrow channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the retrieve bag is dimensioned spaciously to capture large tissue pieces, then the tissue can be reliably taken up as large non-separated pieces, but the retrieve bag cannot be removed through the narrow working channel of the endoscope
Solution Approach 1:
The retrieve bag transitions from a large, expandable configuration during tissue capture to a compressed, compact configuration for removal through the narrow working channel. The flexible material and structural design allow dynamic volume adjustment to satisfy both requirements.
Solution Approach 2:
The retrieve bag is constructed from flexible material that can be compressed and folded to reduce its volume for passage through the endoscope's working channel, while maintaining sufficient capacity to hold large tissue pieces when deployed.
2Volume of moving object
If the retrieve bag is dimensioned spaciously to capture large tissue pieces, then the tissue can be reliably taken up as large non-separated pieces, but the retrieve bag occupies unnecessary large space due to taken up liquid
Solution Approach 1:
The retrieve bag incorporates a hydrophobic air filtering material or diaphragm that allows liquid to pass through while retaining tissue. This porous structure enables selective permeability based on surface tension and pore size, separating liquid from solid tissue.
Solution Approach 2:
Liquid is extracted from the retrieve bag through the hydrophobic filtering material, allowing only gas and liquid vapor to pass while retaining the retrieved tissue. This separation removes the harmful liquid component while preserving the valuable tissue sample.
3Speed
If a hydrophobic air filtering material is provided to allow gas to exit, then gas can be vented from the retrieve bag, but liquid passage is blocked by the water-repelling effect
Solution Approach 1:
The hydrophobic air filtering material utilizes porous structure with pore sizes that allow gas molecules to pass through while the hydrophobic surface tension properties prevent liquid from penetrating the pores, achieving selective permeability.
Solution Approach 2:
The material properties are selected to exploit the difference in surface tension between liquids and gases, allowing gas to pass through the hydrophobic material while blocking liquid based on the water-repelling effect of the material surface.
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
Enables reliable retrieval of large tissue sections as a whole, reducing the need for instrument changes and minimizing the risk of tissue scattering and recurrence.
Implementation Method 1
a section made of hydrophilic water permeable filter diaphragm. Such a filter diaphragm means any filter diaphragm, the pore width thereof is so small that tissue scraps or cells of the retrieved tissue are reliably retained
Implementation Method 2
by pressing out water to a volume that is not remarkably larger than the volume of the retrieved tissue
Data Source
AI summary
A retrieve device for retrieving tissue having a retrieve bag that is at least in part a hydrophilic water permeable filter diaphragm. The filter diaphragm may have a pore width that allows for blocking passage of pathogen cells or other pathogen material. The pores width may also be large enough to allow water to exit out of the retrieve bag. Liquid in the retrieve bag can be expelled through the filter diaphragm and thus does not contribute the volume of the retrieve bag.