Reciprocating Tissue Cutter with Pivoting Inner Cannula
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Solution Overview
Problem
Current tissue cutting devices for neurosurgical procedures face challenges such as inability to quickly and cleanly sever neurological tissue without causing traction, lack of flexibility, and unsuitability for both debulking large structures and finely shaving delicate tissues, while also posing space limitations and risking tissue damage for analysis.
Innovation Solution
A tissue cutting device with a handpiece and inner cannula that reciprocates within an outer cannula, featuring a motor-driven mechanism for precise tissue cutting, a beveled cutting edge, and a hinge for pivoting, allowing for efficient cutting and aspiration of tissue samples without damaging them, and includes a rotatable outer cannula for enhanced maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a tissue cutting device is designed to quickly and cleanly sever neurological tissue, then cutting speed and efficiency are improved, but tissue damage and traction on surrounding tissue worsen
Solution Approach 1:
The device divides the cutting function into two separate components: an outer cannula for debulking large tissue structures and an inner cutting cannula for precise tissue severing. This segmentation allows each component to be optimized for its specific function, enabling quick debulking without damaging surrounding tissue during the precise cutting phase
Solution Approach 2:
The outer cannula acts as an intermediary that first removes large portions of tissue, creating space and reducing the workload for the inner cutting cannula. This intermediary action allows the inner cannula to work more precisely with less traction on surrounding delicate tissue
2Productivity
If a tissue cutting device is designed for debulking large structures, then tissue removal efficiency is improved, but flexibility for fine shaving operations worsens
Solution Approach 1:
The device combines multiple functions in a single integrated system: the outer cannula performs debulking operations, while the inner cutting cannula performs precise tissue severing and fine shaving. Both cannulas can be used independently or together, providing universal applicability for different surgical requirements
Solution Approach 2:
The device allows dynamic adjustment of its configuration - the inner cutting cannula can be advanced or retracted relative to the outer cannula, and the cutting depth can be controlled by adjusting the engagement between the two cannulas. This dynamic adjustability enables transition between debulking and fine shaving modes
3Volume of moving object
If a tissue cutting device is designed to operate in confined spaces, then space utilization is improved, but ease of manipulation by surgeon worsens
Solution Approach 1:
The inner cutting cannula is nested within the outer cannula, creating a compact telescopic structure that minimizes the device's external dimensions while maintaining the functionality of both components. This nested configuration allows the device to access confined spaces while the surgeon can still manipulate the exposed portions for control
4Manufacturing precision
If a tissue cutting device is designed for precise cutting, then cutting precision is improved, but tissue suitability for analysis worsens
Solution Approach 1:
The device creates clean, precise cuts that replicate the appearance of surgically excised tissue without the artifacts of thermal damage or mechanical maceration. This copying of natural tissue separation preserves the tissue's structural and biochemical integrity, making it suitable 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 handpiece includes a proximal section that is angled with respect to a distal section.