Insulated Jaw Electrodes for Electrosurgical Thermal Control
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Solution Overview
Problem
Electrosurgical devices face issues with excess thermal margin, thermal injury, and electrical shorting or re-grasp due to heat spread and residual heat on jaws, which can cause unintended tissue damage and device malfunction.
Innovation Solution
An electrosurgical device with a pair of jaws featuring an insulating shield system made of materials like ETFE, PTFE, or nylon, which covers the active and side surfaces of the electrodes, preventing excessive heat transfer and electrical shorts by forming a lip or ring around the active surfaces to maintain tissue isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrosurgical jaws are used to deliver energy to tissue, then coagulation effect is achieved, but thermal margin and thermal injury occur due to heat spread to surrounding tissue
Solution Approach 1:
The jaw electrode surface is segmented into active and inactive regions. The active surface delivers energy to tissue while the inactive surface is protected by an insulating coating that segments the thermal and electrical fields, preventing heat spread to surrounding tissue and reducing thermal margin effects.
Solution Approach 2:
An insulating coating is introduced as an intermediary layer on the inactive surface of the jaw electrode. This coating acts as a thermal and electrical barrier that mediates between the active electrode surface and the surrounding tissue, preventing excessive heat transfer and reducing thermal injury to adjacent structures.
2Reliability
If electrosurgical jaws are used to deliver energy to tissue, then coagulation effect is achieved, but residual heat on jaws causes thermal injury to surrounding tissue and organs
Solution Approach 1:
An insulating coating is applied beforehand to the inactive surfaces of the jaw electrode, creating a protective cushion against residual heat. This pre-applied insulation cushioning prevents thermal injury to surrounding tissue and organs by absorbing and blocking heat that would otherwise be transferred during or after the coagulation cycle.
3Manufacturing precision
If jaw electrodes are used to treat thin tissues, then surgical precision is improved, but electrical short between jaws occurs causing re-grasp alarm and shutdown
Solution Approach 1:
The jaw electrode is segmented into conductive and insulating regions. The active surface remains conductive for energy delivery while the inactive surface is covered with insulating material, creating distinct functional zones that prevent electrical short between jaws when treating thin tissues, thereby maintaining surgical precision without causing re-grasp alarms.
Solution Approach 2:
Different surfaces of the jaw electrode have different electrical properties: the active surface is conductive to deliver energy to tissue, while the inactive surface is insulating to prevent electrical short. This local differentiation of electrical quality allows precise treatment of thin tissues without causing harmful electrical discharge between the jaws.
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 insulating shield system effectively reduces thermal injury and electrical shorts, ensuring precise energy delivery to the target tissue while preventing unwanted heat spread and re-grasp events, enhancing safety and efficacy in surgical procedures.
Implementation Method 1
An insulating shield system is disposed on the first jaw first side surface and the first jaw second side surface... The first insulating shield system includes an insulating material
Implementation Method 2
The first insulating shield system includes an insulating material... configured to prevent excess thermal margin, thermal injury, and/or electrical short or re-grasp
Data Source
AI summary
An electrosurgical device includes a pair of jaws including a first jaw disposed adjacent to a second jaw. The pair of jaws is movable between open and closed positions. Each jaw comprises an electrode, and each jaw has an active surface. The first jaw active surface is disposed adjacent to the second jaw active surface in the closed position. An actuating member is coupled to one or more of the first and second jaws. The actuating member is configured to move the pair of jaws between the open position and the closed position. In one form, an insulating ring is disposed around the first jaw. In another form, a shield system is disposed on first and second side surfaces of the first jaw and a portion of the first jaw active surface. In yet another form, the shield system forms a lip extending from the first jaw.