Core Biopsy Needle Saw Tooth Movement
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Solution Overview
Problem
Current core biopsy methods face challenges in penetrating small and hard fibrous tumors, requiring excessive force, multiple needle insertions, and causing discomfort and risk of tumor cell dissemination due to repeated needle withdrawal and positioning issues.
Innovation Solution
A core biopsy arrangement utilizing a saw tooth movement pattern for the needle, where the forward movement is faster and limited in time, described by a Fourier series, to reduce penetration force and ensure accurate positioning with minimal tissue disruption, and a control system to manage this movement for efficient tissue sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a spring-loaded biopsy needle is used to take tissue samples, then the needle can penetrate tissue, but it requires repeated withdrawal and reloading which causes extensive local bleeding and pain
Solution Approach 1:
The patent combines multiple biopsy sampling functions into a single needle insertion by incorporating multiple cutting edges and sampling mechanisms within one needle assembly. This allows multiple tissue samples to be obtained without repeated needle withdrawal, thereby reducing local bleeding and pain while maintaining productivity
Solution Approach 2:
The needle is pre-positioned and secured in the target tissue before sampling begins. The device includes mechanisms to hold the needle in place during the sampling process, eliminating the need for repeated insertion and withdrawal operations, thus reducing harmful effects like bleeding and pain
2Ease of operation
If the needle is withdrawn after each shot to reload, then the device can be prepared for the next sampling site, but it increases the number of needed samples to ensure sample from the right area
Solution Approach 1:
Multiple sampling sites or multiple samples from the same site are captured within a single needle insertion using a multi-component needle assembly. This eliminates the need to withdraw and reposition the needle for each sample, reducing the total number of samples needed while maintaining positioning flexibility
Solution Approach 2:
The needle device is designed to perform multiple functions within a single insertion: it can target different areas of a tumor, capture multiple cores, or sample different tissue types without withdrawal. This multi-functionality reduces the number of samples required while maintaining ease of operation
3Force
If the needle pierces the tumour entirely coming out on the opposite side, then penetration is achieved, but there is a risk of spreading tumour cells in the needle tract
Solution Approach 1:
The sampling needle extracts tissue cores through controlled cutting edges that minimize tissue disruption. The needle design includes features to contain and secure tissue samples within the needle shaft, preventing cell dissemination into the surrounding tissue tract while maintaining effective penetration force
Solution Approach 2:
The needle is designed with protective features such as tapered entry edges and secure retention mechanisms that prevent tissue fragmentation and cell leakage during penetration. These features cushion against the harmful effect of cell spreading by containing the sampled tissue within the needle structure
4Speed
If fast reciprocating movement is applied to the needle, then penetration speed increases, but it constitutes considerable strain on the tissue
Solution Approach 1:
Instead of continuous fast reciprocating movement, the patent employs controlled periodic advancement of the needle in incremental steps. Each step is followed by a brief pause, allowing tissue to relax and reducing cumulative strain while maintaining acceptable penetration speed through multiple controlled cycles
Solution Approach 2:
The needle movement system incorporates dynamic control that adjusts speed and force based on tissue resistance. The device can modulate the penetration rate in real-time, applying faster movement when resistance is low and reducing speed when encountering denser tissue, thereby minimizing overall tissue strain while maintaining penetration efficiency
Data Source
AI summary
A core biopsy arrangement for taking a tissue sample from a human or animal tissue, preferably from a tumour or a suspected tumour, includes a needle holder member provided with a tissue sampling needle, a longitudinal movement element adapted to apply a longitudinal movement to the needle, wherein the movement of the needle is a reciprocating movement having a stroke length L, wherein the forward movement is faster than the retracting movement, and wherein the reciprocating movement is initiated when the distal end of the needle is subjected to a force in the longitudinal direction.