Adjustable Fluid Sleeve for Neurosurgical Tissue Cutting
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Solution Overview
Problem
Existing tissue cutting systems for neurosurgical procedures lack the ability to deliver fluids to or near the surgical site and adjust fluid delivery location relative to the tissue cutting location, and often cannot operate in aspiration mode or adjust aspiration extent effectively.
Innovation Solution
A tissue cutting device with a fluid supply sleeve that is selectively positionable along the outer cannula, allowing for delivery of irrigants, hemostatic agents, and tissue sealants, and capable of adjusting the aspiration area through the outer cannula aperture, featuring a reciprocating inner cannula for precise tissue cutting and aspiration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a tissue cutting system is designed for neurosurgical procedures, then cutting precision is improved, but the ability to deliver fluids to the surgical site is lost
Solution Approach 1:
The patent combines the tissue cutting function and fluid delivery function into a single integrated device. The outer cannula serves as both the cutting element guide and the fluid delivery conduit, allowing simultaneous or sequential performance of cutting and fluid delivery operations without requiring separate devices.
Solution Approach 2:
The device is designed with multi-functionality, where the outer cannula can deliver fluids (irrigants, hemostatic agents, tissue sealants) while the inner cannula performs tissue cutting. This universal design allows the system to adapt to various neurosurgical requirements including cutting, irrigating, and hemostasis in a single procedure.
2Device complexity
If a fixed fluid delivery location is used, then device simplicity is maintained, but the ability to adjust fluid delivery location relative to tissue cutting location is lost
Solution Approach 1:
The fluid delivery location is made dynamic rather than fixed. The outer cannula can be positioned at different locations along the inner cannula, allowing the fluid delivery aperture to be adjusted relative to the tissue cutting location. This dynamic positioning enables adaptation to different surgical needs while maintaining a relatively simple device structure.
3Device complexity
If aspiration is not adjustable, then device simplicity is maintained, but the ability to adjust aspiration extent is lost
Solution Approach 1:
The aspiration capability is made adjustable through dynamic control of the outer cannula position and aspiration activation. By controlling when and where the outer cannula is positioned, the extent of aspiration can be adjusted to match the surgical requirements, providing versatility without significantly increasing device complexity.
4Device complexity
If a single cannula design is used, then device simplicity is maintained, but the ability to perform both cutting and fluid delivery is lost
Solution Approach 1:
The device employs a nested cannula structure where the inner cannula is inserted within the outer cannula. The inner cannula performs tissue cutting while the outer cannula delivers fluids and provides aspiration. This nested configuration allows multiple functions to be performed simultaneously or sequentially while maintaining a compact and relatively simple overall device structure.
Data Source
AI summary
A tissue cutting device that is especially suited for neurosurgical applications is disclosed and described. The device includes a handpiece and an outer cannula in which a reciprocating inner cannula is disposed. The inner cannula includes a hinge between a body section and a cutting section that allows the cutting section to pivot when the inner cannula reciprocates within the outer cannula. A tissue collector is also provided and is in fluid communication with the lumen of the inner cannula. A fluid supply sleeve is disposed about the outer cannula and is selectively positionable along the length of the outer cannula.