Tissue Removal Needle With Collapsible Leg
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Solution Overview
Problem
Existing biopsy devices often compromise tissue quality during the sampling process due to mechanical actions, leading to incomplete or damaged tissue samples.
Innovation Solution
A needle assembly with an inner tube and outer cannula, featuring an elastically collapsible leg that changes position from neutral to collapsed when the inner tube is advanced, allowing for precise engagement and retention of tissue samples without damaging them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical actions are used to cut and retain tissue samples, then tissue sampling is achieved, but tissue quality is compromised
Solution Approach 1:
The patent replaces traditional mechanical cutting and retention mechanisms with a vacuum-based system. The vacuum pump creates negative pressure to hold the tissue sample in place, eliminating the need for mechanical fingers or notches that would damage the tissue. This substitution of mechanical action with vacuum pressure directly resolves the contradiction between achieving tissue sampling and maintaining tissue quality.
Solution Approach 2:
The invention employs a vacuum pump and air pressure differential to retain the tissue sample. The vacuum pump creates a pressure difference that holds the tissue against the inner tube wall, providing a non-mechanical retention method. This pneumatic approach allows for gentle tissue handling while maintaining sampling capability, thus resolving the contradiction between productivity and tissue quality.
2Quantity of substance
If vacuum or finger projections are used to capture round cores, then full round core retrieval is achieved, but tissue integrity is compromised
Solution Approach 1:
The patent eliminates mechanical retention structures (fingers, notches, projections) and replaces them with a vacuum-based retention system. The vacuum pump creates negative pressure that uniformly holds the tissue sample without mechanical contact, preserving tissue integrity while maintaining the ability to retrieve full round cores.
Solution Approach 2:
The invention changes the retention mechanism from mechanical contact (fingers, notches) to pressure-based retention (vacuum). By controlling the pressure differential through the vacuum pump, the system can hold the tissue sample securely without mechanical deformation, thus maintaining tissue integrity while achieving complete core retrieval.
3Manufacturing precision
If elastically collapsible leg is used to engage tissue, then tissue retention without damage is achieved, but device complexity increases
Solution Approach 1:
The patent incorporates an elastically collapsible leg that can dynamically change shape from an open state during insertion to a collapsed state for tissue engagement. This dynamic structure allows the device to adapt to tissue conditions and provide gentle retention without mechanical damage, while the elasticity material properties simplify the overall design compared to complex mechanical retention mechanisms.
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, maintaining sample quality and allowing for potential reuse of the needle assembly.
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. In some embodiments, the outer cannula further comprises an aperture configured to allow a tissue portion from within the needle assembly to pass through or otherwise be expelled outside of the needle assembly.