Helical Tissue Sampling Needle for Single-Pass Biopsy
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Solution Overview
Problem
Conventional biopsy devices require multiple tissue samples along a straight path, which is time-consuming and uncomfortable for patients, and lacks precise depth control, necessitating a device that can acquire larger tissue volumes in one pass with accurate depth monitoring.
Innovation Solution
A tissue sampling device featuring a sheath and inner tube with a pivotally mounted cutting needle that moves between radially inward and outward positions, allowing the needle to remove tissue along a helical path when rotated, enabling larger volume sampling and precise depth control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple tissue samples are taken along a straight path, then sufficient tissue volume can be obtained, but the procedure time increases and patient discomfort increases
Solution Approach 1:
The cutting needle follows a curved (helical) path during tissue sampling instead of a straight line. The needle rotates and advances simultaneously, creating a spiral cutting trajectory that increases the length of the cutting path within the same insertion depth, thereby obtaining sufficient tissue volume in a single pass without requiring multiple needle insertions
Solution Approach 2:
The invention adds rotational motion as a new dimension to the traditional linear needle advancement. By combining axial advancement with rotational movement, the needle traces a helical path through the tissue, effectively converting a one-dimensional cutting motion into a two-dimensional spiral path that captures more tissue volume without increasing insertion depth or requiring multiple passes
2Quantity of substance
If multiple tissue samples are taken along a straight path, then sufficient tissue volume can be obtained, but patient discomfort increases due to multiple needle insertions
Solution Approach 1:
The cutting needle follows a curved (helical) path during tissue sampling instead of a straight line. The needle rotates and advances simultaneously, creating a spiral cutting trajectory that increases the length of the cutting path within the same insertion depth, thereby obtaining sufficient tissue volume in a single pass without requiring multiple needle insertions
Solution Approach 2:
The invention adds rotational motion as a new dimension to the traditional linear needle advancement. By combining axial advancement with rotational movement, the needle traces a helical path through the tissue, effectively converting a one-dimensional cutting motion into a two-dimensional spiral path that captures more tissue volume without increasing insertion depth or requiring multiple passes
3Length of moving object
If needle length is increased to obtain deeper tissue samples, then sampling depth increases, but depth control precision decreases
Solution Approach 1:
The device incorporates depth marking features on the sheath that provide visual feedback to the operator during needle advancement. These markings indicate the current insertion depth, allowing the operator to monitor and control the sampling depth in real-time, thereby maintaining precision even when sampling deeper tissues
Solution Approach 2:
The sheath is pre-marked with depth indicators before the procedure begins. These pre-established reference marks allow the operator to plan and control the insertion depth in advance, knowing exactly how deep the needle will penetrate based on the visible markings, thus maintaining depth control precision without requiring longer needles
Data Source
AI summary
A tissue sampling device includes a sheath having an inner surface having a proximal end and a distal end, and an inner surface defining a passage. An inner tube is disposed within the passage. The inner tube has an inner surface defining a passage, and an outer surface radially spaced outward from the inner surface. A cutting needle is pivotally mounted to the inner tube and pivots between a first position radially inward of the inner surface of the sheath and a second position substantially radially outward of the outer surface of the inner tube. Relative movement between the inner tube and the sheath causes the cutting needle to move between the first position and the second position. Rotation of the inner tube relative to the sheath when the cutting needle is in the second position causes the cutting needle to remove tissue in a helical path.