Curved Biopsy Needle Stylet for Single-Insertion Tissue Sampling
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Solution Overview
Problem
Current biopsy needles with straight and rigid stylets require multiple insertions to obtain sufficient tissue samples, leading to increased risk of complications, patient discomfort, and unsatisfactory cosmetic results, as they struggle to collect larger tissue samples effectively.
Innovation Solution
A biopsy needle design featuring a bent or curved distal portion of the inner stylet relative to the outer coaxial sheath, allowing for a larger tissue sample collection and reduced number of insertions, with the stylet capable of bending to facilitate easier navigation and increased sample size without compromising sample integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a straight and rigid stylet is used in a biopsy needle, then the stylet maintains stability and reduces lateral drift during insertion, but the tissue sample size collected is insufficient requiring multiple insertions
Solution Approach 1:
The stylet is designed with a curved configuration that allows it to flex and adapt to tissue contours during insertion, transitioning from a rigid straight form to a dynamic curved form that follows tissue geometry, thereby increasing sample collection capacity while maintaining directional control
Solution Approach 2:
The stylet incorporates a curved or bent configuration instead of a straight rigid form, allowing the distal portion to follow tissue contours and expand the effective sampling area, thereby collecting larger tissue samples in a single insertion while maintaining stability through the curve's geometric properties
2Quantity of substance
If multiple needle insertions are performed to obtain sufficient tissue samples, then adequate sample size is achieved for diagnosis, but patient discomfort and risk of complications increase
Solution Approach 1:
The curved stylet is pre-configured before insertion to match the expected tissue geometry, allowing the needle to navigate and collect adequate tissue sample in a single predetermined motion, thereby eliminating the need for multiple insertions and associated complications
Solution Approach 2:
The flexible curved stylet adapts its configuration during the single insertion process to optimize tissue engagement and sample collection, ensuring adequate sample size is obtained in one procedure rather than requiring multiple traumatic insertions
3Ease of manufacture
If a straight rigid stylet is used, then the needle structure is simple and easy to manufacture, but larger tissue samples cannot be collected effectively
Solution Approach 1:
The stylet is manufactured with a curved configuration using standard bending or forming processes, maintaining relative manufacturing simplicity while dramatically improving tissue sample collection capacity by allowing the stylet to conform to tissue contours and engage larger sample volumes
Data Source
AI summary
Disclosed is a biopsy needle, medical device incorporating the biopsy needle, and method of using the biopsy needle and medical device. The biopsy needle and medical device is used to obtain a sample of tissue for further analysis and testing. The biopsy needle includes an inner stylet that is slidably engaged with an outer coaxial sheath and at least part of the distal portion of the stylet is bent or curved relative to the longitudinal axis of the coaxial sheath.