Puncture Needle with Stopper Member for Controlled Tissue Collection
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Solution Overview
Problem
Conventional suction methods for tissue sampling, such as the suction method and Trucut method, face challenges including high negative pressure leading to tissue scattering and crushing, requiring multiple needle reciprocations, limited sample size collection, and increased operational time, while the Trucut method is expensive and limited in size flexibility.
Innovation Solution
A suction puncture device with a puncture needle featuring a stopper member and a sample containing section within the outer tube, allowing for controlled negative pressure application and tissue collection without excessive impact, enabling efficient collection of tissues of varying sizes without crushing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high negative pressure is applied to suction tissue into the needle, then tissue collection efficiency is improved, but tissue scattering and crushing occur
Solution Approach 1:
The inner tube is divided into two functional sections: a sample introduction section with larger diameter for efficient tissue suction, and a sample holding section with smaller diameter that prevents excessive compression. This segmentation allows the system to achieve both high collection efficiency and tissue integrity preservation simultaneously.
Solution Approach 2:
Different sections of the inner tube are designed with different diameters to perform different functions. The introduction section has larger diameter to facilitate tissue entry, while the holding section has smaller diameter to maintain tissue structure. This local differentiation of geometric properties resolves the contradiction between suction efficiency and tissue preservation.
2Quantity of substance
If the puncture needle is reciprocated multiple times to collect sufficient tissue, then sample quantity is improved, but operational time increases
Solution Approach 1:
The stopper member is pre-positioned within the inner tube before puncture to define the sample holding section. This preliminary configuration ensures that tissue collected in a single reciprocation is immediately contained and prevented from escaping, eliminating the need for multiple reciprocations and reducing operational time while maintaining sufficient sample quantity.
Solution Approach 2:
The stopper member acts as an intermediary element that facilitates single-pass tissue collection by creating a controlled holding section. It mediates between the suction force and tissue containment, allowing sufficient tissue to be collected in one reciprocation without requiring multiple operations.
3Adaptability or versatility
If the outer tube diameter is increased to collect larger tissue samples, then sample size flexibility is improved, but device complexity and cost increase
Solution Approach 1:
The inner tube can be dynamically adjusted relative to the outer tube through advancement and retraction movements. By changing the relative positions of the inner and outer tubes, the effective sample holding section length can be adjusted, providing sample size flexibility without requiring multiple needles of different diameters, thus avoiding increased device complexity.
Solution Approach 2:
The inner tube is nested within the outer tube, with the inner tube's sample holding section positioned within the outer tube's lumen. This nested configuration allows the system to collect tissue samples of varying lengths by adjusting how much of the inner tube extends into the target, providing adaptability while maintaining a simple two-tube structure.
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 allows for quick and reliable tissue collection with reduced operational time, enabling efficient cytodiagnosis and tissue diagnosis, and is cost-effective compared to existing methods.
Implementation Method 1
a suction device (21) connected to the base end side of the outer tube (11) so as to be able to suction the inside of the sample containing section (13)
Data Source
Figure 1
Figure 2
Figure 3A~3D
AI summary
A puncture needle (2) has an outer tube (11) that has an opening edge of a front end formed in the shape of a blade, and a stopper member (12) that has a front end disposed within the outer tube (11) at a position separated from the front end of the outer tube (11) by a predetermined distance. A sample containing portion (13) is formed between the front end of the stopper member (12) and the front end of the outer tube (11). A ventilation passage (14) is formed around the stopper member (12) within the outer tube (11). A suction device (21) is connected to the base end side of the outer tube (11). The suction device (21) is communicated and connected with the sample containing portion (13) via the ventilation passage (14).