Electrosurgical Device for Bladder Tumor Resection
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Solution Overview
Problem
Current transurethral resection techniques for bladder tumors are limited in removing large tumors en bloc due to excessive bleeding, risk of bladder wall perforation, and inability to perform radical resection without general anesthesia, especially for highly vascularized tumors.
Innovation Solution
A novel surgical method using short pulses of monopolar dissection mode with an electrosurgical device to carefully prepare and remove bladder tumors en bloc, minimizing bleeding and maintaining visual control, combined with an electrosurgical apparatus that automatically controls pulse duration for easier operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional transurethral resection techniques are used for large bladder tumors, then the tumor can be removed by fragmentation, but excessive bleeding occurs and visualization is impaired
Solution Approach 1:
The electrosurgical device performs preliminary coagulation of blood vessels before tumor resection. The system applies high-frequency current to seal vascular structures ahead of the resection path, preventing blood loss during subsequent tissue removal and maintaining clear visualization throughout the procedure
Solution Approach 2:
The device uses pulsed high-frequency current delivery with automated cycle control. The system alternates between coagulation phases and resection phases, allowing brief intervals for heat dissipation and tissue stabilization, which prevents excessive thermal damage while maintaining hemostasis
2Reliability
If the loop electrode is advanced deep in the tissues for radical resection, then complete tumor removal is achieved, but the risk of bladder wall perforation increases
Solution Approach 1:
The electrosurgical device incorporates automated depth control with real-time feedback mechanisms. The system monitors tissue impedance and power consumption to detect when the electrode approaches the bladder wall boundary, automatically adjusting or stopping current delivery to prevent perforation while ensuring complete tumor excision
Solution Approach 2:
The system replaces manual mechanical control of the loop electrode with automated electrosurgical control. The high-frequency current system provides precise tissue interaction without requiring deep mechanical insertion, using electrical field penetration to achieve radical resection margins while maintaining safety through electronic rather than mechanical depth control
3Illumination intensity
If high-flow perfusion is used to maintain visual control during resection of highly vascularized tumors, then constant visualization is achieved, but intravesical pressure increases and risk of bladder wall perforation increases
Solution Approach 1:
The device performs preliminary coagulation of highly vascularized areas before resection begins. By sealing blood vessels in advance, the system reduces ongoing blood loss that would otherwise require high-flow perfusion for clearance, thereby maintaining good visualization with lower perfusion rates and reduced intravesical pressure
4Productivity
If horizontal resection layer-by-layer is performed on small tumors, then the tumor can be removed, but the technique is unacceptable for highly vascular tumors due to excessive bleeding
Solution Approach 1:
The system uses automated cyclic control of high-frequency current delivery, alternating between coagulation bursts and resection phases. This periodic operation allows brief coagulation intervals to seal vessels before each resection cut, enabling horizontal layer-by-layer removal of even highly vascularized tumors without excessive bleeding
Solution Approach 2:
The electrosurgical device dynamically adjusts current parameters including frequency, amplitude, and pulse duration based on tissue type and vascular density. The system automatically modifies electrical parameters to optimize coagulation effectiveness while minimizing thermal damage, enabling safe resection of tumors with varying vascularity
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 safe and radical removal of bladder tumors of any size or location with minimal bleeding and reduced risk of bladder wall perforation, allowing for spinal anesthesia and efficient perfusion, thus improving surgical outcomes.
Implementation Method 1
high-frequency current (electric resection)
Implementation Method 2
means for automatic regulation of the voltaic arc intensity
Data Source
AI summary
An electrosurgical apparatus having a HF power source providing HF energy for electrosurgery and a circuitry to control application of said HF energy to an electrode end used in electrosurgically operating on a patient is characterized in that said circuitry is adapted to apply in a dissecting mode said HF energy for dissecting to an electrode end automatically in the form of pulses such that the pulses automatically have a defined length. This device can be used for exploration of the bladder and en bloc radical removal of a large tumor using the active resection electrode loop of an optic resectoscope such that the bladder wall layers below the tumor base within the intact tissue margin are prepared using step-by-step coagulation and dissection of the tumor nutrient vessels and of the interlayer tissue fibers performed by impulsive turns-on of the electrosurgical apparatus in-use in the monopolar dissection mode.