Half Cannula Biopsy Needle Semi-Circular Core Extraction
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Solution Overview
Problem
Existing biopsy devices often damage tissue during sampling and struggle to maintain the physical integrity of the tissue sample, particularly when obtaining a full-circular core, which is crucial for accurate medical evaluation.
Innovation Solution
A biopsy needle design featuring an internal and external tubular member with a semi-circular cross-section and textured sections that allow for a close fit and sliding mechanism, minimizing tissue damage and facilitating easier sample removal by maintaining the tissue's physical state during extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a full-circular core biopsy is obtained using existing devices, then the quantity of tissue sample is improved, but the tissue physical integrity deteriorates due to damage during sampling and withdrawal
Solution Approach 1:
The biopsy device is divided into two separate tubular members: an inner tubular member with a semi-circular cross-section that cuts and collects tissue, and an outer tubular member that provides a protective sheath. This segmentation allows the tissue to be collected in a dedicated chamber while being protected from damage during withdrawal, resolving the contradiction between obtaining full circular cores and maintaining tissue integrity.
Solution Approach 2:
The inner tubular member acts as an intermediary between the cutting edge and the tissue sample. It features a semi-circular cross-section that captures tissue in a dedicated chamber, isolating the sample from the external environment and preventing damage during extraction. This intermediary structure enables full circular core collection while protecting tissue physical integrity.
2Ease of operation
If the tubular members are made to slide smoothly, then the ease of operation is improved, but the tissue sample may shift or be damaged during withdrawal
Solution Approach 1:
The inner tubular member is designed with a semi-circular cross-section that provides a specific geometric fit for the tissue sample. This local geometric constraint, combined with the close fit between the inner and outer tubular members, stabilizes the tissue sample in the chamber while allowing smooth sliding during insertion and withdrawal. The semi-circular geometry provides reliable tissue containment without compromising operational smoothness.
Data Source
AI summary
There is disclosed, among other things, embodiments of a biopsy needle for taking a full core sample through soft tissue. In the illustrated embodiments, an inner tubular member having a semi-cylindrical distal end is within and slidable with respect to an outer tubular member. A semi-cylindrical channel is in the distal end, as well as a planar end surface. The channel has a set of one or more protrusions or texture, and a complementary set of protrusions or texture are placed on the inside of the outer member so that the sets of protrusions or texture face each other when the distal ends of the members are adjacent each other. Methods for using these embodiments are also described.