Dual-Channel Oocyte Retrieval Needle With Transverse Flushing
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Solution Overview
Problem
Current oocyte retrieval methods result in approximately 60% retrieval rates, limiting the chances of success in in-vitro fertilization, and existing apparatuses do not effectively maximize the volume of biological material extracted from intracorporeal sacs.
Innovation Solution
A needle design with a first flow channel for aspiration and a second flow channel for flushing fluid, where the flushing fluid outlet is configured transverse to the aspiration channel, creating vortical structures within the intracorporeal sac to enhance the displacement and movement of biological material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional aspiration needles are used for oocyte retrieval, then the procedure is simple and quick, but the retrieval rate is limited to approximately 60%
Solution Approach 1:
The needle is divided into functionally distinct segments: a first flow channel for aspiration and a second flow channel for flushing fluid delivery. This segmentation allows simultaneous or sequential performance of multiple functions (aspiration and flushing) that work together to improve retrieval rates beyond what a single-channel needle can achieve
Solution Approach 2:
The invention merges the aspiration function and flushing function into a single integrated needle device. By combining both flow channels in one needle, the system achieves协同 effect where flushing dislodges oocytes and aspiration simultaneously or sequentially retrieves them, thereby improving overall retrieval efficiency without requiring multiple separate devices
2Quantity of substance
If flushing fluid is directed parallel to the aspiration channel, then the device structure is simple, but the volume of biological material extracted is not maximized
Solution Approach 1:
The outlet of the second flow channel is configured to direct flushing fluid in a direction substantially transverse (perpendicular) to the first flow channel rather than parallel to it. This dimensional change in fluid delivery creates vortical flow patterns that enhance mixing and displacement of biological material, thereby increasing the volume of material that can be effectively extracted
3Productivity
If multiple aspiration passes are performed to increase retrieval rate, then more oocytes may be retrieved, but the procedure time and patient exposure to invasive procedure increase
Solution Approach 1:
The dual-channel needle enables continuous useful action by allowing flushing and aspiration to occur simultaneously or in rapid sequence without requiring device changes or prolonged procedural steps. The flushing action continuously dislodges oocytes while aspiration continuously retrieves them, maintaining effective action throughout the procedure and reducing total time compared to multiple separate aspiration passes
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 new needle design increases the likelihood of successfully retrieving biological material from a larger volume of the intracorporeal sac by promoting vortical flow patterns, improving retrieval rates beyond existing methods.
Implementation Method 1
the outlet is configured to direct the flushing fluid in a direction substantially transverse to the first flow channel... creating vortical structures within the intracorporeal sac to enhance the displacement and movement of biological material
Implementation Method 2
a first flow channel comprising an inlet for aspirating biological material from the intracorporeal sac
Data Source
Figure 1a~1b
Figure 2
Figure 3
AI summary
A needle for extraction of biological material from a fluid filled intracorporeal sac, the needle comprising: a shaft comprising a first flow channel comprising an inlet for aspirating biological material from the intracorporeal sac and a second flow channel comprising an outlet for supplying a flushing fluid to the intracorporeal sac; and wherein the outlet is configured to direct the flushing fluid in a direction substantially transverse to the first flow channel; and methods using the needle.