Long-Electrode RF Cutting With Insulated Distal Support
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Solution Overview
Problem
Existing electrosurgical devices lack the ability to precisely cut target tissue adjacent to non-target tissue, particularly in scenarios where direct control over the position and force of the electrode is limited, leading to potential harm to non-target tissues.
Innovation Solution
An electrosurgical device with an elongate shaft featuring a large, electrically insulated distal portion and a smaller electrode configured to prevent movement into cuts or punctures, ensuring precise cutting of target tissue while preventing advancement into non-target tissue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a small surface area electrode is used to deliver sufficient current density for cutting, then cutting effectiveness is improved, but the risk of advancing into non-target tissue increases
Solution Approach 1:
The electrode assembly is segmented into two distinct parts: a small surface area electrode for delivering RF energy to cut tissue, and a large surface area insulating distal portion that prevents advancement into non-target tissue. This segmentation allows each part to perform its specific function optimally without interfering with the other.
Solution Approach 2:
Different parts of the device have different surface areas and functions: the electrode portion has a small surface area optimized for current density and cutting, while the distal portion has a large surface area optimized for prevention of advancement. This local differentiation of properties resolves the contradiction between cutting effectiveness and precision.
2Reliability
If a large surface area electrode is used to prevent advancement into non-target tissue, then safety is improved, but current density for cutting is reduced
Solution Approach 1:
The device is divided into functional segments: the electrode with small surface area for high current density delivery, and the distal portion with large surface area for mechanical support and prevention of over-advancement. This segmentation allows both safety and cutting effectiveness to be optimized independently.
Solution Approach 2:
The distal portion acts as an intermediary mechanical element that does not participate in energy delivery but provides the large surface area needed to prevent advancement into non-target tissue, while the electrode separately provides the high current density needed for cutting.
3Ease of operation
If the physician has less direct control over position and force of the electrode, then ease of operation is improved, but the ability to perform discrete cutting is reduced
Solution Approach 1:
The device performs the precision function automatically through its design: the large surface area distal portion self-regulates the insertion depth by preventing advancement into non-target tissue, eliminating the need for the physician to precisely control position and force. The device's geometry itself provides the precision control.
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 device enables safe and precise cutting of target tissue by minimizing the risk of damaging adjacent non-target tissue, enhancing control in minimally invasive procedures.
Implementation Method 1
A target tissue can be vaporized using a conductive material that delivers RF energy of a specific voltage, frequency, and current density to it.
Implementation Method 2
The at least one electrode is configured to cut the target tissue by the application of energy to the at least one electrode
Data Source
AI summary
An electrosurgical device for discretely cutting target tissue that is adjacent non-target tissue includes an elongate shaft having a proximal portion including a proximal end and a distal portion including a distal end. At least one electrode is configured to cut the target tissue. The at least one electrode has a surface area and is located on the distal portion. The distal portion is electrically insulated from the at least one electrode and has a surface area significantly larger than the surface area of the at least one electrode. The distal portion is configured to prevent movement of the distal portion into a cut or puncture formed in the target tissue by application of energy to the at least one electrode.