Electrosurgical Instrument Suction Aperture and Return Electrode
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Solution Overview
Problem
Conventional electrosurgical instruments face challenges in underwater endoscopic surgery, including high power requirements, tissue heating, capacitive coupling, limited depth of effect, and visualization issues due to vaporized tissue products and fluid heating in small body cavities.
Innovation Solution
A bipolar electrosurgical instrument with a tissue treatment electrode and a return electrode, where the tissue treatment electrode has a planar surface and a suction aperture, and the return electrode has a fluid contact surface, forming a conductive fluid path, and a peripheral gap for aspirating vapor bubbles and particulate material, reducing power requirements and improving visualization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If monopolar electrosurgery is used with high power levels, then tissue treatment effectiveness is improved, but tissue heating at the return plate causes severe skin burns and power losses occur in the conductive fluid medium
Solution Approach 1:
The invention extracts the return electrode from the external body surface and relocates it to the distal end of the instrument shaft, immersing it in the conductive fluid medium within the body cavity. This separation removes the harmful heating effect from the patient's skin while maintaining the electrosurgical circuit functionality.
Solution Approach 2:
The conductive fluid medium (irrigation fluid) serves as an intermediary to complete the electrical circuit between the active electrode and the return electrode. The fluid medium conducts the return current away from the tissue, preventing direct heating at the return site while allowing effective tissue treatment at the active electrode.
2Length of moving object
If bipolar electrodes are spaced further apart to increase depth of effect, then tissue penetration is improved, but the electrodes obscure vision of the application site and require modification in surgical technique
Solution Approach 1:
The invention positions both electrodes at the distal end of a long instrument shaft, utilizing the longitudinal dimension of the shaft to achieve adequate electrode spacing while keeping the electrodes confined to the distal region. This allows the proximal shaft to remain clear of the surgical field, maintaining unobstructed vision.
3Reliability
If the tissue treatment electrode is completely buried in tissue to enable return electrode circuit completion, then electrical circuit continuity is improved, but the electrode orientation becomes sensitive to application angle changes
Solution Approach 1:
The conductive fluid medium acts as an intermediary that allows the return electrode to complete the electrical circuit without requiring deep tissue burial. The fluid provides a conductive path that is less sensitive to precise electrode orientation and application angle variations.
4Power
If conventional electrosurgical instruments are used in small body cavities, then tissue treatment is possible, but vaporized tissue products and heated fluid reduce visualization and cause collateral tissue damage
Solution Approach 1:
The invention extracts harmful byproducts (vaporized tissue products and heated fluid) from the surgical site using a suction mechanism. The suction channel removes these harmful factors before they can cause collateral damage or obscure visualization, allowing continued effective tissue treatment.
Solution Approach 2:
The invention converts the harmful heated fluid and vaporized products into removable debris that can be suctioned away. By actively removing these byproducts, the system transforms a harmful accumulation into a controlled removal process, improving safety and visualization.
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 instrument achieves lower power levels, enhanced depth of effect, reduced tissue damage from heated fluid, and improved visualization by effectively aspirating vapor bubbles and debris, facilitating safer and more effective tissue treatment in small body cavities.
Implementation Method 1
the return electrode having a fluid contact surface so as to define, in use, a conductive fluid path that completes an electrical circuit between the tissue treatment electrode and the return electrode
Implementation Method 2
a suction aperture in the tissue treatment electrode, and the insulation member includes an aperture, and the tissue treatment electrode is mounted with respect to the aperture such that a peripheral gap exists around at least a substantial portion of the periphery of the tissue treatment electrode, such that a suction channel is formed by the peripheral gap between the tissue treatment electrode and the insulation member through which vapour bubbles and/or particulate material can be aspirated
Implementation Method 3
This arrangement has advantages from the safety standpoint, due to the relative proximity of the two electrodes so that radio frequency currents are limited to the region between the electrodes
Data Source
AI summary
An electrosurgical instrument for the treatment of tissue in the presence of an electrically-conductive fluid medium comprises an instrument shaft (10), and an electrode assembly (12) at one end of the shaft. The electrode assembly (12) comprises a tissue treatment electrode (14) and a return electrode (18) which is electrically insulated from the tissue treatment electrode by means of an insulation member (16). The tissue treatment electrode (14) has an exposed surface for treating tissue, and the return electrode (18) has a fluid contact surface so as to define, in use, a conductive fluid path that completes an electrical circuit between the tissue treatment electrode and the return electrode. The tissue treatment electrode (14) is provided with at least one aperture (14a) through which vapour bubbles and/or particulate material can be aspirated from the region surrounding the tissue treatment electrode, and the tissue treatment electrode and the insulation member are disposed such that there is a gap therebetween forming an additional suction channel (25).