Biopsy Needle Collapsible Leg Tissue Engagement
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Solution Overview
Problem
Existing biopsy devices often compromise tissue quality during the sampling process due to mechanical actions employed for tissue engagement, cutting, and retention.
Innovation Solution
A needle assembly with an inner tube and outer cannula, featuring an elastically collapsible leg that changes position upon forward movement, allowing for tissue engagement and retention without compromising the sample's integrity, utilizing materials like elgiloy or super elastic materials for the collapsible leg and incorporating a cutting edge for effective tissue sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical actions are employed for tissue engagement and cutting, then tissue sampling capability is improved, but tissue quality is compromised
Solution Approach 1:
The biopsy device employs dynamic mechanical actions where the inner tube and outer cannula move relative to each other in a controlled sequence. The inner tube advances first to engage tissue, then the outer cannula advances to cut and retain the sample. This dynamic, staged approach allows gentle tissue engagement followed by precise cutting, maintaining tissue quality while achieving effective sampling.
Solution Approach 2:
The biopsy device is segmented into distinct functional components: an inner tube for tissue engagement and a separate outer cannula for cutting and retention. This segmentation allows each component to perform its specific function optimally without compromising the other, enabling gentle tissue capture followed by precise mechanical cutting, thus preserving tissue integrity.
2Productivity
If traditional biopsy devices are used for tissue removal, then sampling function is achieved, but tissue integrity is compromised
Solution Approach 1:
The inner tube performs preliminary engagement of the tissue sample before the outer cannula is advanced for cutting. This preliminary action allows the tissue to be gently captured and positioned within the inner tube, maintaining its structural integrity. Only after this preliminary engagement does the outer cannula advance to complete the cutting action, ensuring tissue integrity is preserved throughout the sampling process.
3Manufacturing precision
If elastically collapsible leg is used for tissue retention, then tissue quality is maintained, but device complexity increases
Solution Approach 1:
The collapsible leg is made from elastic material that changes its physical state in response to mechanical stress. During the biopsy procedure, the leg collapses from an expanded state to a compressed state as the inner tube advances, automatically engaging the tissue. This parameter change (from expanded to compressed) provides effective tissue retention without requiring complex mechanical structures, maintaining tissue quality while keeping the device relatively simple.
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 solution enables the efficient and intact removal of tissue samples by engaging and retaining the tissue portion within the inner tube, maintaining sample quality and facilitating easy withdrawal and removal without causing mechanical damage.
Implementation Method 1
an elastically collapsible leg operably engaged with the inner tube and the outer cannula whereby a forward movement of a portion of the inner tube within the interior cavity of the outer cannula changes the elastically collapsible leg from a neutral position to a collapsed position
Data Source
AI summary
A tissue removal apparatus and needle assembly for extracting a tissue portion from tissue or the like, the needle assembly comprising an inner tube having an interior cavity, an outer cannula having a proximal end, a distal end and an interior cavity, the interior cavity of the outer cannula having an interior diameter to slidably receive the inner tube and a collapsible section operably engaged with the inner tube and the outer cannula whereby a forward movement of a portion of the inner tube within the interior cavity of the outer cannula changes the collapsible section from a neutral position to a collapsed position to engage the tissue portion. A method of tissue removal comprising the steps of positioning a needle assembly in a tissue, engaging a tissue portion and withdrawing the needle assembly to remove the tissue portion from the tissue.