Arthroscopic Handle With Single Umbilical Cable
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Solution Overview
Problem
Current arthroscopic surgical cutters lack the ability to efficiently and safely remove both hard and soft tissues during procedures like subacromial decompression and anterior cruciate ligament reconstruction, with existing devices requiring complex sterilization processes and multiple external connections.
Innovation Solution
A reusable, sterilizable handle integrated with a single umbilical cable that powers both a motor drive unit and delivers RF power to a disposable bipolar RF probe, featuring a ceramic cutting member with high hardness and fracture toughness for efficient tissue cutting and removal, and a system that includes Hall sensors and Schmitt triggers for noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single umbilical cable is used to deliver both motor power and RF power through the handle, then the number of external connections is reduced and sterilization is simplified, but the risk of fluid intrusion and electrical interference increases
Solution Approach 1:
The patent implements a nested structure where the inner conductive sleeve is positioned within the outer conductive sleeve, creating concentric electrical pathways. This nesting allows both RF power delivery and motor power delivery through the same handle structure while maintaining electrical isolation through insulation layers, thus reducing external connections without compromising reliability
Solution Approach 2:
The patent introduces insulation layers as intermediary elements between the inner and outer conductive sleeves. These insulation layers act as mediators that prevent direct electrical contact between the two pathways, blocking fluid intrusion and electrical interference while allowing both power delivery functions to coexist through the single handle
2Productivity
If bipolar RF cutting is implemented with inner and outer conductive sleeves, then cutting effectiveness is improved, but the complexity of the device increases
Solution Approach 1:
The outer conductive sleeve serves multiple functions: it acts as a return path for RF current, provides structural support for the probe, and functions as an electrode for bipolar cutting. The inner sleeve simultaneously delivers RF power and provides a secondary return path. This multi-functionality achieves effective bipolar cutting without proportionally increasing device complexity
Solution Approach 2:
The concentric arrangement of inner and outer conductive sleeves creates a compact bipolar electrode structure. The nesting allows both sleeves to be integrated within a single probe diameter, delivering bipolar cutting capability without significantly increasing the overall device size or structural complexity
3Measurement precision
If Hall sensors and Schmitt triggers are integrated into the motor drive unit, then noise reduction and control precision are improved, but the device complexity increases
Solution Approach 1:
The patent combines the Hall sensors and Schmitt triggers into an integrated control circuit within the motor drive unit. This merging of sensing and control functions into a single integrated system reduces the overall device complexity compared to having separate discrete components, while maintaining high measurement precision and noise reduction 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
The solution enables efficient cutting and removal of both hard and soft tissues with reduced risk of fluid intrusion and electrical interference, simplifying sterilization and setup while maintaining high precision and safety.
Implementation Method 1
The RF electrical cable must be routed distally in parallel to a reusable handle. In such a prior art device, the coupling of RF does not extend through the reusable handle.
Implementation Method 2
The use of Hall effect sensors for monitoring rotational speed of an inner sleeve relative to an outer sleeve in an electrosurgical cutter is described in US 2016/0346036 and US 2017/0027599
Implementation Method 3
At least one Schmitt trigger operatively coupled to the at least one signal circuit for reducing noise induction therein
Data Source
AI summary
An arthroscopic system includes a re-useable, sterilizable handle integrated with a single umbilical cable or conduit. The single umbilical cable or conduit carries electrical power from a power and/or control console to the handle for operating both a motor drive unit within the handle and delivering the RF power to a disposable RF probe or cutter which may be detachably connected to the handle. The RF power delivered to the handle and on to the probe or cutter is typically bi-polar, where the handle includes first and second electrical bi-polar contacts that couple to corresponding bi-polar electrical contacts on a hub of the disposable RF probe or cutter is connected to the handle.