Arthroscopic Probe Integrating RF Electrode and Shaver
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Solution Overview
Problem
Current arthroscopic shavers and RF devices are inefficient due to separate tools for mechanical cutting and electrosurgical procedures, with designs that are not suitable for tight spaces, lack durability, and have inadequate fluid extraction channels, leading to increased risk of infection and reduced visibility during procedures.
Innovation Solution
A disposable arthroscopic probe with a rotating shaver blade and integrated bi-polar RF electrode, featuring a ceramic housing for durability, a compact design with a large fluid extraction channel, and a secure electrode attachment to prevent detachment during use, optimized for use with a motor-drive handpiece for efficient tissue cutting and ablation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate electrosurgical probes are used for ablation and coagulation, then electrosurgical functions can be performed, but tool exchange frequency increases and infection risk increases
Solution Approach 1:
The patent combines mechanical cutting and electrosurgical ablation/coagulation functions into a single integrated arthroscopic probe. The probe includes both a rotating mechanical cutting member and an RF electrode arrangement, allowing surgeons to perform multiple functions without exchanging tools, thereby reducing infection risk and procedure time
Solution Approach 2:
The integrated probe serves multiple functions: mechanical cutting via the rotating cutting member, tissue ablation via the RF electrode, and coagulation via the RF electrode. This multi-functional design eliminates the need for separate specialized tools while maintaining all required capabilities
2Ease of operation
If electrode projects outwardly from outer sleeve, then electrosurgical contact is improved, but maneuverability in tight spaces deteriorates
Solution Approach 1:
The RF electrode is nested within the outer sleeve structure, with the electrode contained inside the hollow interior of the outer sleeve. This nesting arrangement allows the electrode to function effectively while maintaining a compact insertion profile that can maneuver in tight joint spaces
Solution Approach 2:
The electrode is positioned to extend along the longitudinal axis of the probe rather than projecting radially outward. This dimensional reorientation allows sufficient electrode length for effective tissue contact while keeping the radial insertion profile diameter small for better maneuverability
3Length of moving object
If small diameter extraction channel is used, then insertion profile is reduced, but fluid extraction capability deteriorates
Solution Approach 1:
The fluid extraction system is segmented into multiple aspiration ports distributed around the probe. This includes at least one aspiration port positioned near the cutting member and another near the electrode, allowing effective fluid and debris removal despite the small overall insertion profile diameter
Solution Approach 2:
Different regions of the probe have specialized extraction capabilities: aspiration ports are strategically positioned near the cutting member for mechanical debris removal and near the electrode for ablation vapor removal. This localized quality optimization ensures effective fluid extraction throughout the working area
4Reliability
If electrode is securely attached to outer sleeve, then durability is improved, but manufacturing complexity increases
Solution Approach 1:
The electrode is pre-positioned and secured within the outer sleeve during probe assembly before sterilization and use. This preliminary securing action ensures the electrode cannot detach during surgical use when substantial forces are applied, while the simple integration into the hollow outer sleeve minimizes manufacturing complexity
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
The solution enables efficient and safe arthroscopic procedures by providing a durable, compact, and effective tool for both mechanical cutting and electrosurgical ablation, reducing the risk of infection and improving visualization by optimizing the electrode placement and fluid management.
Implementation Method 1
arthroscopic shavers and burrs having rotational cutting surfaces to remove soft tissue and bone
Implementation Method 2
electrosurgical ablation devices for ablating, coagulating or contouring soft tissue
Implementation Method 3
electrosurgical ablation devices for ablating, coagulating or contouring soft tissue
Implementation Method 4
integrated aspiration mechanism for extracting resected tissue, irrigation fluid and ablation debris
Data Source
AI summary
An arthroscopic tissue resecting probe includes an elongated shaft having outer and inner sleeves which are formed from an electrically conductive material extending about an axis to a working end. Outer and inner resecting windows are formed in the sleeves in the working end. The working end includes a ceramic body having a collar portion extending fully around a region of the outer sleeve proximal to outer resecting window. A radiofrequency (RF) electrode is disposed on an outer surface of the ceramic body and is spaced-apart from the outer resecting window.