Handheld Tissue Extraction Needle Vacuum Mechanism
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Solution Overview
Problem
Existing handheld devices for extracting tissue samples are complex and require significant driving force, often leading to inefficient tissue sampling and potential pain due to tissue entanglement during the extraction process.
Innovation Solution
A handheld device with a needle arrangement comprising a cutting needle and a sample extraction needle, where the cutting needle is connected to a vacuum chamber that expands to reduce pressure, facilitating suction of tissue into the sample extraction needle for efficient cutting and sample collection, utilizing a simple vacuum-assisted mechanism with minimal driving force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional handheld device uses multiple independent driving arrangements for the cutting needle and sample extraction needle, then the tissue sampling function is complete, but the device complexity increases and more driving force is required
Solution Approach 1:
The patent merges the driving arrangements by mechanically connecting the first member (driving the cutting needle) to the sample extraction needle assembly. This single integrated driving arrangement simultaneously controls both the cutting needle movement and the sample extraction needle operation, reducing device complexity while maintaining complete tissue sampling function
Solution Approach 2:
The first member serving as both the driver for the cutting needle and the mechanical connector for the sample extraction needle exemplifies multi-functionality. This universal component performs multiple functions (driving cutting, controlling extraction) through a single arrangement, simplifying the overall device structure
2Productivity
If the cutting needle moves back over the side opening to cut the tissue sample, then the tissue sample is successfully extracted, but tissue entanglement and pain may occur with conventional devices
Solution Approach 1:
The side opening is pre-positioned on the sample extraction needle before insertion. During the needle advancement, tissue is already drawn into the needle through this pre-positioned opening by vacuum action, so that when the cutting needle moves back, the tissue is already properly positioned and secured, preventing entanglement and pain
Solution Approach 2:
A vacuum source is connected to the sample extraction needle to create negative pressure that actively sucks tissue into the needle through the side opening before cutting. This pneumatic action secures the tissue firmly in place, preventing entanglement during the cutting process and reducing patient pain
3Ease of operation
If a vacuum chamber is used to assist tissue suction, then tissue extraction is facilitated, but the device requires more complex control arrangements
Solution Approach 1:
The vacuum chamber control is merged with the existing needle advancement mechanism. The same mechanical motion that advances the needle also operates the vacuum chamber, eliminating the need for separate control systems and reducing overall device complexity while maintaining effective tissue suction capability
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 achieves efficient tissue sampling with reduced pressure in the vacuum chamber, allowing for easy extraction and cutting of tissue samples with minimal operator effort, reducing the risk of tissue entanglement and pain, and enabling multiple samples from a single insertion.
Implementation Method 1
a movement between said first member and said second member to increase the volume of said vacuum chamber thereby reducing the pressure in said sample extraction needle
Implementation Method 2
reducing the pressure in said sample extraction needle induces a movement between said cutting needle and said sample extraction needle to expose said side opening of said sample extraction needle
Data Source
AI summary
A handheld device for extracting tissue samples includes a needle arrangement and control arrangement. The needle arrangement has a cutting needle, a sample extraction needle, and a first end for inserting into tissue. The cutting needle has a cutting edge for cutting the tissue sample. The sample extraction needle has a side opening for receiving the tissue. The control arrangement has a vacuum chamber in fluid communication with the sample extraction needle. The vacuum chamber has a first member and a second member that move relative to each other. The first member is mechanically connected to the cutting needle. The handheld device is configured so that movement between the first and second members to increase volume of the vacuum chamber thereby reduces pressure in the sample extraction needle, induces movement between the cutting needle and the sample extraction needle to expose the side opening.