Rotating Biopsy Needle Stylet Mechanism
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Solution Overview
Problem
Existing biopsy needle devices often cause axial translation impact during tissue sample collection, leading to potential trauma and inaccuracy in sample extraction, as they require longitudinal movement to sever the sample, which can result in damage to surrounding tissues and organs.
Innovation Solution
The biopsy needle assembly features a needle with a distal end having a window and a stylet with a notch, allowing for rotational cutting and sample capture without axial displacement, minimizing translational movement and reducing trauma by using a mechanism where the stylet rotates to open and close the window, facilitating precise tissue sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If axial translation is used to sever tissue sample, then cutting action is achieved, but tissue trauma and sampling inaccuracy increase
Solution Approach 1:
Instead of moving the needle axially to cut tissue, the patent inverts the approach by rotating the stylet within the needle to open and close the window, thereby capturing and severing the tissue sample through rotational motion rather than longitudinal translation.
Solution Approach 2:
The patent transitions from one-dimensional axial motion to two-dimensional rotational motion. The stylet rotates within the needle, using angular displacement in the circumferential dimension to achieve tissue capture and severing, thereby eliminating the need for harmful axial translation at the tissue site.
2Productivity
If longitudinal movement is used to capture tissue sample, then sample extraction is achieved, but surrounding tissues and organs are damaged
Solution Approach 1:
The patent inverts the conventional approach by using rotational motion of the stylet to close the window and capture tissue, rather than advancing the needle longitudinally to push tissue into the lumen. This eliminates axial displacement at the tissue site while maintaining effective sample capture.
Solution Approach 2:
The window in the needle and the stylet act as intermediaries that enable tissue capture through rotation. The window provides a controlled opening/closing mechanism, and the rotating stylet serves as the mediating element that opens and closes this window, allowing tissue to be captured and severed without direct axial impact.
3Manufacturing precision
If axial displacement is used during biopsy, then tissue severing is achieved, but precision of sample collection decreases
Solution Approach 1:
The patent employs dynamic rotational motion of the stylet within the needle to achieve precise tissue capture. The stylet can rotate to open the window for tissue entry, then rotate to close the window for capture, and finally rotate to sever the sample, providing dynamic control over the sampling process without axial displacement.
Solution Approach 2:
The rotating stylet mechanism is self-contained within the needle assembly, with the stylet's rotation itself performing the functions of opening/closing the window and severing tissue. The system uses its own internal rotational motion to achieve precise sample collection without requiring external axial displacement mechanisms.
Data Source
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AI summary
A biopsy needle assembly configured for use with a tissue biopsy device is disclosed. The biopsy needle assembly may be configured to be advanced to a predetermined tissue sample, sever the tissue sample, and extract the tissue sample from a body tissue of a patient. The biopsy needle assembly may be further configured to minimize or eliminate the axial translation of the biopsy needle beyond a targeted location.