Bipolar RF Electrosurgical Blade with Segmented Return Electrode
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Solution Overview
Problem
Current bipolar electrosurgical devices are not configured to cut small tissues, such as nerves, and pose safety concerns due to undefined energy pathways in monopolar devices, leading to potential patient burns during procedures like spine or brain surgery.
Innovation Solution
A bipolar radiofrequency electrosurgical device with an elongate shaft and fluid conduit, featuring a first electrode for cutting tissue and a second electrode for receiving RF energy, designed with a curvilinear shape and larger surface area to minimize collateral damage, along with an alignment element to maintain the first electrode's position and a fluid conduit for irrigation or suction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monopolar RF energy is delivered to target tissue, then cutting and coagulation functions are achieved, but undefined energy pathways cause current to flow to unwanted tissue areas resulting in patient burns
Solution Approach 1:
The return electrode is segmented into multiple discrete contact points along the shaft rather than a single large pad, creating multiple defined pathways that confine current flow to the immediate treatment area and prevent widespread energy dispersion
Solution Approach 2:
The return electrode transitions from a two-dimensional pad on the patient's body to a one-dimensional linear array of contact points along the shaft, fundamentally changing the geometry of the energy pathway and enabling precise localization of current flow
2Adaptability or versatility
If bipolar devices are designed for large area tissues, then general surgical procedures are supported, but the devices cannot cut small tissues such as nerves or be used for microsurgery
Solution Approach 1:
The active electrode is designed with a small, localized tip geometry optimized for precise cutting of small tissues, while the return electrode provides a distributed array of contact points that adapt to different tissue sizes and surgical applications
Solution Approach 2:
The device allows dynamic adjustment of the effective treatment area by selecting different combinations of return electrode contact points, enabling the same device to function for both microsurgery on small nerves and broader surgical procedures on larger tissues
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 cutting and coagulation of small tissues while reducing the risk of collateral damage and patient burns by defining a controlled energy pathway and minimizing unwanted energy dispersion.
Implementation Method 1
a first electrode is at least partially disposed within the lumen and extends distally from the distal end of the shaft, the first electrode is sized and configured to cut tissue with radiofrequency energy
Implementation Method 2
a second electrode is arranged in a bipolar configuration with the first electrode, the second electrode is coupled to ground and configured to receive radiofrequency energy from the first electrode
Data Source
AI summary
An electrosurgical medical device includes an elongate shaft defining a proximal end, a distal end, and a lumen there through. A fluid conduit is disposed within the lumen. A first electrode is at least partially disposed within the lumen and extends distally from the distal end of the shaft, the first electrode is sized and configured to cut tissue with radiofrequency energy. A second electrode is arranged in a bipolar configuration with the first electrode, the second electrode is coupled to ground and configured to receive radiofrequency energy from the first electrode. The second electrode is defined by at least a portion the shaft and extending a distance away from the distal end of the shaft.