Biopsy Device Rotational Cannula Alignment
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Solution Overview
Problem
Current biopsy devices require manual rotation of the probe assembly to obtain tissue samples at different radial orientations, which can be inconvenient and inefficient.
Innovation Solution
A biopsy device with a probe assembly and driver unit that simultaneously rotate two cannulas in opposite directions at different velocities to periodically align their apertures, forming a virtual tissue sample aperture at multiple angular radial positions, allowing for efficient tissue sampling without manual adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual rotation of the probe assembly is used to obtain tissue samples at different radial orientations, then tissue sampling at multiple orientations is achieved, but operator convenience deteriorates and sampling efficiency decreases
Solution Approach 1:
The invention transforms the static probe assembly into a dynamic system where the inner cannula rotates automatically relative to the outer cannula. The rotation mechanism allows the apertures to dynamically align at different radial orientations without requiring manual rotation of the entire probe assembly, thereby maintaining adaptability while significantly improving ease of operation.
Solution Approach 2:
The system performs self-rotation through the differential rotation capability of the inner cannula relative to the outer cannula. The apertures automatically align at multiple radial orientations through the rotational mechanism, enabling the device to serve itself in achieving multi-orientation sampling without operator intervention for rotation, thus improving both convenience and efficiency.
2Adaptability or versatility
If manual rotation of the probe assembly is used to obtain tissue samples at different radial orientations, then tissue sampling at multiple orientations is achieved, but sampling efficiency deteriorates
Solution Approach 1:
The dynamic rotation mechanism enables rapid repositioning of the inner cannula apertures relative to the outer cannula, allowing multiple tissue samples to be obtained in succession without the time-consuming manual rotation of the entire probe assembly. This dramatically improves sampling efficiency while maintaining the capability to sample at multiple radial orientations.
Solution Approach 2:
The continuous rotation capability of the inner cannula allows for uninterrupted tissue sampling at multiple radial orientations. The system can continuously form virtual apertures at different orientations as the inner cannula rotates, eliminating the interruptions caused by manual rotation and thereby improving overall sampling efficiency and productivity.
3Extent of automation
If simultaneous rotation of two cannulas in opposite directions is implemented, then automated multi-orientation sampling is achieved, but device complexity increases
Solution Approach 1:
The invention employs a nested structure where the inner cannula is positioned within the outer cannula. This nesting allows the inner cannula to rotate independently while sharing the same longitudinal axis, enabling automated multi-orientation sampling through a compact design that minimizes overall device complexity despite the added rotational capability.
Solution Approach 2:
The solution adds rotational freedom in the angular dimension while maintaining the linear longitudinal axis. By introducing rotation about the longitudinal axis for the inner cannula, the system achieves automated multi-orientation sampling without significantly complicating the overall device structure, as the rotation occurs in a dimension perpendicular to the main insertion direction.
Data Source
AI summary
A biopsy device includes a probe assembly and a driver unit. The probe assembly includes a first cannula having a first aperture extending to a lumen proximal to a first distal end of the first cannula. A second cannula has a second aperture extending to a lumen proximal to the second distal end of the second cannula. The second cannula is disposed co-axially with the first cannula. A least one of the first aperture and the second aperture has a cutting edge. The driver unit is configured for releasably mounting the probe assembly. The driver unit is operatively configured to simultaneously rotate the first cannula and the second cannula at different rotational velocities so that the first aperture and the second aperture periodically come into alignment to form a virtual tissue sample aperture.