Neurosurgical Tissue Cutting Device with Reciprocating Cannula
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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 hand-held design featuring a reciprocating inner cannula within an outer cannula, capable of high-speed reciprocation and variable aspiration, configured for use with surgical imaging devices, and equipped with a tissue collector to manage tissue samples effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a tissue cutting device is designed for high-speed reciprocation to quickly sever tissue, then productivity is improved, but tissue damage and traction on surrounding tissue increases
Solution Approach 1:
The inner cannula is configured to reciprocate at high speeds (e.g., 1000-5000 reciprocations per minute) within the outer cannula, creating a vibrating cutting action that severs tissue quickly while minimizing traction on surrounding tissue through the rapid oscillatory motion rather than sustained pulling force
2Manufacturing precision
If a tissue cutting device is designed with a fixed configuration for debulking large structures, then manufacturing precision is improved, but adaptability to different tissue sizes and surgical spaces deteriorates
Solution Approach 1:
The device incorporates variable aspiration control that allows the surgeon to adjust the aspiration level dynamically during the procedure, enabling the same device to effectively handle both large structures requiring debulking and smaller delicate structures requiring fine shaving, adapting to different surgical needs without changing the physical device configuration
Solution Approach 2:
The tissue cutting device is designed with a universal applicability through its variable aspiration capability and reciprocating cutting mechanism, allowing it to perform multiple functions including debulking large structures, finely shaving smaller structures, and preserving tissue for analysis, all within a single device configuration
3Productivity
If a tissue cutting device uses emulsification or thermal methods to remove tissue, then productivity is improved, but tissue preservation for analysis deteriorates
Solution Approach 1:
The device extracts and removes tissue samples through the outer cannula in a controlled manner, allowing selective retrieval of tissue specimens that remain intact and suitable for pathological and histologic analysis, rather than emulsifying or thermally destroying the tissue during the cutting process
4Ease of operation
If a tissue cutting device is designed for one-handed manipulation in tight spaces, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The device merges multiple functions including reciprocating cutting, variable aspiration control, and tissue sample collection into a single integrated hand-held unit, allowing one-handed operation in tight surgical spaces while maintaining the necessary complexity for versatile tissue resection capabilities
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise and efficient cutting of neurological tissues, minimizing tissue damage and preserving samples for analysis, while allowing for both debulking and fine shaving operations within tight surgical spaces.
Implementation Method 1
a vacuum unit (168) operably connected to the tissue cutting device (40), whereby the vacuum unit (168) provides a controllable vacuum level to the tissue cutting device (40) for aspirating tissue received in the outer cannula opening (49)
Implementation Method 2
an inner cannula (76) configured to reciprocate within an outer cannula lumen (110) of an outer cannula (44) at high speeds... inner cannula distal end (79) configured to cut tissue samples
Data Source
AI summary
A tissue cutting device 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. At least one position transducer for tracking a location in space of the tissue cutting device is rigidly associated with the handpiece. The position transducer is operable for sending a signal indicative of a location of a distal end of the outer cannula. The tissue cutting device may also include an angular position sensor for determining an angular position of the outer cannula relative to the position transducer.