Adjustable Delivery Sleeve for Neurosurgical Tissue Cutting
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Solution Overview
Problem
Existing tissue cutting systems for neurosurgical procedures lack the ability to simultaneously deliver fluids and ancillary devices to the surgical site and accurately adjust fluid delivery relative to the cutting location, and often fail to operate effectively as aspiration wands with precise control over aspiration extent.
Innovation Solution
A tissue cutting device with a delivery sleeve attached to an outer cannula, allowing for simultaneous fluid delivery and adjustable aspiration, featuring a reciprocating inner cannula within an outer cannula, a motor-driven mechanism for precise tissue cutting, and a delivery sleeve that can be positioned along the length of the outer cannula for fluid and device delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a tissue cutting system is designed for neurosurgical procedures, then tissue cutting precision is improved, but the ability to deliver fluids and ancillary devices 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 dual purposes: it acts as a guide for the reciprocating inner cannula (tissue cutting) and simultaneously serves as a delivery conduit for fluids and ancillary devices to the surgical site. This merging of functions resolves the contradiction by allowing both precise tissue cutting and fluid delivery capabilities to coexist in one system.
Solution Approach 2:
The outer cannula is designed as a multi-functional component that performs multiple roles: guiding the inner cannula for precise tissue cutting, delivering fluids to the surgical site, and providing a pathway for ancillary devices. This universal design allows the system to adapt to different surgical needs while maintaining tissue cutting precision, thereby resolving the contradiction between specialized cutting capability and overall system versatility.
2Adaptability or versatility
If fluid delivery is added to the tissue cutting device, then fluid delivery capability is improved, but the ability to accurately adjust fluid delivery location relative to the cutting location is lost
Solution Approach 1:
The delivery sleeve is designed to be movable along the outer cannula, allowing dynamic adjustment of the fluid delivery location relative to the cutting site. The sleeve can be positioned at different locations by advancing or retracting it along the length of the outer cannula, enabling the surgeon to accurately control where fluids are delivered in relation to the tissue cutting location. This dynamic positioning capability resolves the contradiction by providing both fluid delivery capability and precise location control.
3Productivity
If the device is designed for tissue cutting, then cutting effectiveness is improved, but the ability to operate as an aspiration wand with precise control over aspiration extent is lost
Solution Approach 1:
The delivery sleeve's movable design allows it to function as an aspiration wand by controlling the extent of aspiration through its position along the outer cannula. When the sleeve is retracted, it exposes more of the outer cannula opening for aspiration; when advanced, it limits the aspiration area. This dynamic control mechanism provides precise adjustment of aspiration extent while maintaining tissue cutting effectiveness, resolving the contradiction between cutting productivity and aspiration control ease.
Data Source
AI summary
A tissue cutting device is disclosed and described. The device includes a handpiece and an outer cannula in which a reciprocating inner cannula is disposed. A delivery sleeve may be selectively provided that is configured to be disposed about the outer cannula for delivery of a variety of devices.