Electrosurgical Generator Power Distribution Control
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Solution Overview
Problem
Electrosurgical generators often face insufficient power to supply multiple probes during the ramping phase, leading to delayed procedures and inefficiencies, as existing systems are typically limited to 50 W and struggle with simultaneous large lesions.
Innovation Solution
A method that temporarily disables energy delivery to the least or most power-consuming probe during ramping, using a control system to check for disabling conditions and re-enable channels when power becomes available, ensuring all probes reach a set temperature within the generator's output limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the generator supplies power to multiple probes simultaneously during ramping phase, then all probes can reach set temperature faster, but the generator exceeds its maximum output power limit
Solution Approach 1:
The control system proactively monitors the total power demand of all probes during the ramping phase and predicts when the generator will exceed its maximum output limit. By taking preliminary action to disable a probe channel before the power limit is actually reached, the system prevents the contradiction from occurring and allows smooth transition to the next phase without interruption.
Solution Approach 2:
The system dynamically adjusts the number of active probe channels based on real-time power conditions. During ramping phase, if total power demand approaches the generator's maximum output, the control system automatically disables one channel to maintain power within limits. This dynamic adaptation resolves the contradiction by making the system flexible rather than static.
2Reliability
If the generator limits power output to stay within maximum limits, then power distribution remains stable, but probe ramping time increases and procedure duration extends
Solution Approach 1:
The control system implements periodic monitoring of power demand and probe temperatures throughout the procedure. By continuously checking power levels and probe status, the system can rhythmically enable and disable channels as needed, maintaining stable power distribution while minimizing overall procedure time through efficient timing of channel activation.
Solution Approach 2:
The system uses feedback from temperature sensors and power monitors to continuously adjust channel activation. When probes approach their set temperature or when power demand decreases, the system feeds this information back to the control algorithm, which then enables previously disabled channels. This feedback mechanism resolves the contradiction by allowing the system to maintain stability while reducing total procedure duration.
3Power
If the system disables a probe channel to reduce power consumption, then the generator operates within power limits, but the disabled probe cannot reach its set temperature
Solution Approach 1:
The system dynamically manages channel activation based on real-time probe temperature and power demand. When a channel is disabled to maintain power limits, the system continuously monitors the probe's temperature progress. Once power becomes available or other probes complete their ramping, the disabled channel is re-enabled to reach its target temperature, ensuring thermal treatment is completed without compromising overall power management.
Solution Approach 2:
The control system temporarily discards (disables) certain probe channels when power constraints require it, but plans to recover (re-enable) these channels later when power becomes available. This temporary discarding allows the generator to operate within limits during critical phases, while the recovery mechanism ensures that all probes ultimately receive the necessary thermal treatment to reach their set temperatures.
Data Source
AI summary
A method and apparatus are disclosed for using a generator having insufficient power to supply power to a number of electrosurgical probes during ramping up of the probes to reach set point temperatures. The method includes reducing energy delivery to at least one probe by temporarily disabling energy delivery thereto. Some embodiments comprise a method of delivering energy to at least two electrosurgical probes connected to at least two of the channels of a generator wherein the generator has a maximum output, the method comprising: (a) activating channels which are to be activated; (b) checking for disabling conditions; and (c) if there are disabling conditions, disabling the channel which takes the least power amongst all active channels.