Arthroscopic Cutting Probe With Rotating Sleeve And RF Electrode
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Solution Overview
Problem
Existing arthroscopic surgical tools lack the flexibility to efficiently and effectively perform both mechanical and electrosurgical cutting and removal of both soft and hard tissues, necessitating a variety of tools for different procedures and anatomical differences.
Innovation Solution
A single arthroscopic cutting probe with a tubular design featuring a rotating inner sleeve and an outer sleeve, equipped with an active electrode and a return electrode, allowing for mechanical cutting and electrosurgical enhancement through controlled rotation and RF current application, along with aspiration capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate surgical tools are used for different tissue types and procedures, then functional versatility is improved, but device complexity and the number of interchangeable components increases
Solution Approach 1:
The patent applies multi-functionality by integrating both mechanical cutting capabilities (through rotating cutting surfaces) and electrosurgical capabilities (through electrodes) into a single arthroscopic shaver handpiece. This allows the device to perform multiple surgical functions including soft tissue removal, hard tissue resection, cutting, ablation, and coagulation without requiring multiple separate tools or interchangeable probes, thereby reducing device complexity while maintaining functional versatility.
Solution Approach 2:
The patent merges previously separate mechanical cutting functions and electrosurgical functions into a single integrated device. The handpiece combines a motor-driven rotating cutting surface for mechanical resection with electrodes for electrosurgical cutting, ablation, and coagulation, allowing both functional systems to operate from one unified platform rather than requiring separate interchangeable tools.
2Device complexity
If a single tool is used for both mechanical and electrosurgical functions, then device complexity is reduced, but the ability to perform specialized procedures may be compromised
Solution Approach 1:
The single arthroscopic shaver handpiece is designed with universal multi-functionality, incorporating both mechanical cutting surfaces for soft and hard tissue resection and electrodes for electrosurgical cutting, ablation, and coagulation. This integrated design maintains specialized procedure capability while reducing the need for multiple interchangeable tools.
Solution Approach 2:
The device employs dynamic functionality by allowing the motor-driven cutting surfaces to rotate at variable speeds and the electrodes to be selectively activated, enabling the single tool to adapt to different surgical procedures and tissue types through controlled operational parameters rather than requiring physical reconfiguration.
3Productivity
If rotational cutting surfaces are used for hard tissue resection, then cutting efficiency is improved, but the ability to perform electrosurgical procedures requires additional components
Solution Approach 1:
The patent merges rotational mechanical cutting surfaces with electrosurgical electrodes into a single integrated arthroscopic shaver handpiece. The motor-driven rotating cutting surfaces provide efficient hard tissue resection while electrodes are integrated into the same device for electrosurgical cutting, ablation, and coagulation functions, eliminating the need for separate electrosurgical components.
Solution Approach 2:
The handpiece achieves multi-functionality by combining mechanical resection capabilities with electrosurgical capabilities in one device, allowing efficient cutting of hard and soft tissues through rotational surfaces while also performing electrosurgical procedures through integrated electrodes, all from a single unified platform.
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 efficient and versatile tissue resection with both mechanical shearing and electrosurgical ablation/coagulation, adapting to various surgical procedures and anatomical sites with improved precision and efficiency.
Implementation Method 1
An active electrode will usually be disposed on a distal exterior surface of an inner sleeve or tubular cutter so that it can apply electrosurgical current to tissue when aligned with the outer cutting window in the outer tubular sleeve
Implementation Method 2
Rotation of the inner sleeve will cause an inner cutting window to rotate past the outer cutting window to resect tissue received through the cutting windows as they pass each other
Implementation Method 3
A longitudinal passageway will typically extend through the inner sleeve from its proximal end to its distal end and be adapted for coupling to a negative pressure source
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
An arthroscopic cutting probe includes an outer sleeve having a longitudinal bore and an outer cutting window at its distal end. An inner sleeve is rotationally disposed in a bore of the outer sleeve, and the inner sleeve has a distal end, a proximal end, a longitudinal passageway, and an inner cutting window at its distal. An active electrode sleeve is disposed on an outer surface of the inner sleeve in a position opposed to the inner cutting window. Rotation of the inner sleeve relative to the outer sleeve causes the inner cutting window to rotate past the outer cutting window to resect tissue received through the cutting windows as they pass each other. Radiofrequency current can be applied to the active electrode to enhance tissue cutting then the cutting windows are being rotated or to able or cauterize tissue when the cutting windows are held stationary with the active electrode disposed through the outer cutting window.