Rotating Biopsy Needle with Cutting Slits for Precise Tissue Sampling
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Solution Overview
Problem
Current biopsy devices face challenges in precisely targeting small tumors due to the sharp, solid tip of biopsy needles, which cause unnecessary trauma and risk the dissemination of tumor cells, and struggle with filling the needle with tissue and severing the sample effectively, especially in dense tissues.
Innovation Solution
A biopsy arrangement featuring an elongated hollow member with a circular cross-section and a cutting edge at the distal end, incorporating a rotational member for controlled rotation and a cutting slit, along with a suction generating unit and an oscillating longitudinal movement, to facilitate tissue collection and separation from surrounding tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a sharp, solid needle tip is used for tissue penetration, then penetration capability is improved, but tissue trauma and tumor cell dissemination increase
Solution Approach 1:
The needle tip is segmented into multiple cutting edges arranged circumferentially, transforming a single sharp point into multiple controlled cutting points that slice through tissue rather than puncturing it, thereby reducing trauma while maintaining penetration capability
Solution Approach 2:
The cutting edges are arranged in a circular pattern at the distal end of the hollow member, creating a rotational cutting mechanism that slices tissue in a controlled manner rather than penetrating with a sharp point, reducing tissue damage and tumor cell dissemination risk
2Length of moving object
If a long needle tip (5-15 mm) is used for penetration, then penetration depth is improved, but precision in targeting small tumors deteriorates
Solution Approach 1:
The hollow member is designed to rotate during the biopsy procedure, transforming the static long needle tip into a dynamic rotating cutting tool that can precisely target small tumors while maintaining adequate penetration depth through controlled rotational movement
Solution Approach 2:
The cutting action is moved from a linear penetration mode to a rotational cutting mode, adding a rotational dimension to the tissue sampling process that improves precision for small tumors while maintaining penetration capability
3Force
If manual or spring-loaded thrust mechanisms are used for needle insertion, then insertion capability is improved, but placement precision deteriorates
Solution Approach 1:
The insertion mechanism is transformed from a simple linear thrust to a controlled rotational movement that allows precise placement of the hollow member at the target site while maintaining adequate insertion force through the rotational cutting action
4Length of moving object
If a fixed thrust length greater than 10 mm is used, then penetration capability is improved, but patient trauma beyond lesion dimensions increases
Solution Approach 1:
The fixed thrust length is replaced with a controlled rotational movement that allows the hollow member to cut through tissue at the precise depth needed, preventing unnecessary trauma to healthy tissue beyond the lesion dimensions while maintaining adequate penetration capability
Solution Approach 2:
The cutting action is localized to the distal end of the hollow member where the cutting edges are positioned, allowing precise tissue sampling at the target site without affecting surrounding healthy tissue, thereby reducing patient trauma
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
This solution allows for precise tissue sampling with minimal trauma, effective filling of the needle with tissue, and reliable severance of the sample from surrounding tissue, reducing patient discomfort and the risk of tumor cell dissemination.
Implementation Method 1
a suction generating unit and an oscillating longitudinal movement, to facilitate tissue collection and separation from surrounding tissue
Implementation Method 2
a rotational member configured to apply rotational movement to the hollow member, wherein the rotational movement is applied in accordance to a rotational procedure such that the hollow member is rotated in one direction a predefined amount of rotations, and thereafter rotated in an opposite direction approximately the same predefined amount of rotations
Implementation Method 3
an oscillating longitudinal movement, to facilitate tissue collection and separation from surrounding tissue
Data Source
AI summary
The present invention relates to an arrangement for taking a biopsy in a human or animal tissue, comprising an elongated hollow member having a circular cross-section in a plane perpendicular to a longitudinal axis, and a circular cutting edge at distal end. The circular cutting edge is provided with at least one cutting slit, running from the cutting edge in a proximal direction of the elongated hollow member. The arrangement further comprises a rotational member configured to apply rotational movement to the hollow member, wherein the rotational movement is applied in accordance to a rotational procedure such that the hollow member is rotated in one direction a predefined amount of rotations, and thereafter rotated in an opposite direction the same amount of rotations.