Microwave Surgical Device Coagulation Timing Control
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Solution Overview
Problem
Conventional microwave surgical devices lack the ability to detect the completion of coagulation accurately, leading to potential hypercoagulation or uncompleted coagulation, and may short-circuit during resection due to incorrect timing conditions, compromising safety and effectiveness.
Innovation Solution
A microwave surgical device control method that detects coagulation completion by monitoring the change in direct current electric resistance value as tissue temperature rises, using a determination processing part to control microwave output, ensuring appropriate timing for coagulation and preventing hypercoagulation or uncompleted coagulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If microwave output is controlled based on fixed time irradiation, then the device structure is simple, but coagulation completion cannot be detected accurately leading to hypercoagulation or uncompleted coagulation
Solution Approach 1:
The patent applies feedback by measuring the electrical resistance value of the tissue during microwave irradiation and using this measurement to control the microwave output. The determination processing part continuously monitors resistance changes and automatically adjusts or terminates microwave irradiation when coagulation is detected, creating a closed-loop control system that ensures precise coagulation completion detection without requiring complex fixed-time control mechanisms.
Solution Approach 2:
The patent replaces the mechanical/time-based control system with an electrical measurement system. Instead of relying on fixed irradiation time or complex mechanical timers, the system uses electrical resistance measurement to detect tissue coagulation state, substituting mechanical control with electrical field-based detection and control.
2Reliability
If microwave irradiation time is extended to ensure complete coagulation, then coagulation completeness is improved, but tissue carbonation and electrode spark discharge occur due to hypercoagulation
Solution Approach 1:
The system uses real-time electrical resistance measurement as feedback to monitor tissue coagulation progress. When the resistance value indicates that coagulation is complete, the determination processing part automatically terminates microwave irradiation, preventing over-coagulation that would lead to tissue carbonation and electrode spark discharge while ensuring complete coagulation is achieved.
Solution Approach 2:
The patent monitors changes in electrical resistance parameter of the tissue during microwave irradiation. By detecting the specific resistance value change that indicates coagulation completion, the system dynamically adjusts the irradiation duration based on actual tissue state rather than fixed time parameters, preventing both under-coagulation and hypercoagulation.
3Adaptability or versatility
If bipolar treatment tool is used for multifunctional operations, then operational versatility is improved, but electrical short-circuit may occur during resection when both electrodes contact each other
Solution Approach 1:
The system uses electrical resistance measurement as a safety feedback mechanism. When both electrodes contact each other causing a short-circuit, the resistance value drops to near zero, which is immediately detected by the determination processing part, causing automatic termination of microwave output and preventing electrical hazards while maintaining the versatility of bipolar treatment tools.
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 precise coagulation by automatically terminating microwave output based on resistance value changes, improving operability and preventing tissue damage, thus enhancing the functionality and safety of the device.
Implementation Method 1
the inside of the body tissue is irradiated with the convergent microwaves from the electrode and the tissue in the vicinity of the electrode is coagulated by the dielectric heat energy that is generated in the organism
Implementation Method 2
detecting the completion of coagulation (hemostasis or sealing) of tissue and determining the completion of coagulation at an appropriate timing depending on the conditions etc. of the body tissue by making use of the change in the direct current electric resistance value due to the reduction in the amount of water in the tissue with the advancement of the coagulation of the body tissue by irradiation of microwave
Implementation Method 3
controlling a microwave (high-frequency wave) oscillation output by making use of the change in the direct current electric resistance value
Data Source
AI summary
The solution of the problem to be solved is the provision of a means for determining timing both accurately and securely at which a treatment is shifted from gripping and coagulation (hemostasis or sealing) to resection by using a multifunctional treatment tool capable of exfoliation, gripping, coagulation (hemostasis or sealing) and resection of the treated region in a bipolar microwave treatment tool. A microwave surgical device control method and a device, in which the completion of coagulation (hemostasis or sealing) of tissue is detected and a microwave oscillation output is controlled by making use of the change in the direct current electric resistance value due to the reduction in the amount of water as the temperature rise of the tissue at the time of heating and coagulation of the tissue in the treated region with microwaves.