Reciprocating Cannula Tissue Cutter for Neurosurgery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current tissue cutting devices for neurosurgical procedures face challenges in quickly and cleanly severing neurological tissue without causing traction or damage, lacking flexibility, and are not suitable for both debulking large structures and finely shaving smaller ones, while also failing to preserve tissue for analysis.
Innovation Solution
A tissue cutting device with a reciprocating inner cannula within a fixed outer cannula, capable of high-speed cutting and variable aspiration, designed for use with surgical imaging devices, allowing precise control and compatibility with both open and closed procedures, featuring a hand-held design with a rotating outer cannula for enhanced maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If known tissue cutting devices are used to quickly sever neurological tissue, then cutting speed is improved, but tissue damage and traction on surrounding tissue worsen
Solution Approach 1:
The device employs a reciprocating inner cannula that moves back and forth within a fixed outer cannula, creating dynamic cutting action. The inner cannula's reciprocating motion allows for controlled tissue engagement and disengagement, enabling quick cutting while minimizing continuous traction on surrounding tissue. This dynamic mechanism resolves the contradiction by providing high-speed cutting capability without the harmful effects of sustained pulling forces.
Solution Approach 2:
The cutting device is divided into two distinct cannulas: an inner reciprocating cannula and an outer fixed cannula. This segmentation allows the inner cannula to perform the cutting function while the outer cannula provides structural support and defines the cutting path. The separated functions enable efficient tissue severing while the outer cannula's presence prevents uncontrolled traction on surrounding tissues.
2Quantity of substance
If known tissue cutting devices are used for debulking large structures, then large tissue removal capability is improved, but flexibility for fine shaving operations worsens
Solution Approach 1:
The reciprocating inner cannula can be adjusted to different positions within the outer cannula, allowing dynamic control over the cutting depth and engagement. This adjustability enables the device to switch between aggressive debulking mode (greater engagement) and fine shaving mode (minimal engagement), providing versatility for both large tissue removal and delicate operations.
Solution Approach 2:
The device allows changing operational parameters by adjusting the reciprocating cannula's position, speed, and engagement depth. These parameter changes enable the same device to perform both debulking operations (high engagement, rapid reciprocation) and fine shaving operations (low engagement, controlled reciprocation), resolving the contradiction between tissue removal quantity and operational flexibility.
3Productivity
If known tissue cutting devices are used to resect tissue, then tissue resection capability is improved, but tissue integrity for subsequent analysis worsens
Solution Approach 1:
The reciprocating motion of the inner cannula creates a controlled cutting action that severs tissue cleanly without excessive friction or heat generation. The intermittent contact during reciprocation prevents continuous thermal damage and mechanical stress that would compromise tissue integrity. This dynamic cutting mechanism enables effective tissue resection while preserving sample quality for pathological and histological analysis.
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. The tissue cutting device may be used with imaging device such as microscopes and endoscopes during neurosurgery procedures.