Offset Motor Tissue Cutter with Reciprocating Cannula
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tissue cutting devices for neurosurgical procedures face challenges in quickly and cleanly severing neurological tissue without causing traction or damage, lacking flexibility, and being unsuitable for both debulking large structures and finely shaving delicate ones, while also failing to preserve tissue for analysis.
Innovation Solution
A tissue cutting device with a 'gun sight' design featuring a handpiece with a motor drive assembly offset from the cutting axis, allowing for precise control and reduced length, equipped with a reciprocating inner cannula within an outer cannula, and a tissue collector for aspirating severed tissue, enabling efficient cutting and collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a reciprocating inner cannula is used within an outer cannula, then cutting precision and control are improved, but device complexity increases
Solution Approach 1:
The patent implements a nested cannula structure where an inner cannula is positioned within an outer cannula. The inner cannula performs the cutting function while the outer cannula provides structural support and guides the cutting motion. This nesting arrangement achieves precise cutting through the inner cannula's reciprocating motion while the outer cannula simplifies the overall structure by providing a stable framework, thereby resolving the contradiction between cutting precision and device complexity.
2Ease of operation
If the motor drive assembly is offset from the cutting axis, then ergonomics and maneuverability are improved, but device length increases
Solution Approach 1:
The patent offsets the motor drive assembly from the cutting axis, transitioning the motor's position from a linear alignment to a lateral position. This dimensional change allows the motor to be positioned perpendicular to the cutting path, improving ergonomics and maneuverability by allowing the surgeon to hold and manipulate the device more comfortably while maintaining a compact overall device length through optimized spatial arrangement.
3Productivity
If a tissue collector is integrated with the cutting device, then tissue collection efficiency is improved, but device complexity increases
Solution Approach 1:
The patent integrates the tissue collector directly with the cutting device, merging two previously separate functions into a single unified instrument. The tissue collector is positioned to receive and contain severed tissue samples immediately after cutting, eliminating the need for separate collection tools and improving workflow efficiency. This integration is achieved through careful design that combines the cutting mechanism and tissue collection chamber into one cohesive device structure.
4Adaptability or versatility
If the device is designed for both debulking and fine shaving, then versatility is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs a reciprocating inner cannula that can be selectively positioned within the outer cannula to vary the cutting depth and aggressiveness. By adjusting the extent of reciprocation and the position of the inner cannula relative to the outer cannula, the device can dynamically switch between aggressive debulking mode (deeper cuts, faster removal) and fine shaving mode (shallow cuts, precise trimming), providing versatility across different surgical requirements while maintaining manageable manufacturing precision through a single adjustable mechanism.
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 outer and inner cannulae are offset from the motor and drive assembly, and the center of gravity of the device is in the forward part of the device, providing an ergonomic design that is particularly suited for neurosurgical applications.