Surgical Instrument Power Control via Dynamic State Transition
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Solution Overview
Problem
Existing electrosurgical and thermal surgical instruments face challenges in controlling power delivery, leading to overheating and potential damage, especially when the instrument is not in contact with tissue, which can result in adverse outcomes for patients.
Innovation Solution
The implementation of a system that uses software and hardware to manage power delivery through algorithms, including PID controllers and state machines, which vary power based on the environment of the active element, preventing overheating and allowing for precise temperature control of the thermal surgical instrument.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If power is continuously delivered to the electrosurgical instrument, then the active element can maintain heating capability for tissue treatment, but the instrument may overheat when not in contact with tissue, causing safety issues and potential damage
Solution Approach 1:
The patent implements dynamic power adjustment by transitioning between multiple power states (first power state when in contact with tissue, second power state when not in contact) based on real-time detection of the active element's environment. This dynamic adaptation allows the system to maintain effective treatment temperature while preventing dangerous overheating, directly resolving the technical contradiction between maintaining heating capability and preventing overheating damage
Solution Approach 2:
The system employs feedback mechanisms through detectors that continuously monitor whether the active element is in contact with tissue or in air, and automatically adjust power delivery accordingly. This closed-loop control ensures the instrument receives appropriate power levels based on actual operating conditions, preventing overheating while maintaining effective treatment temperatures
2Ease of operation
If the surgeon needs to handle the instrument for prolonged periods, then the instrument must be portable and manageable, but heat transfer to the surgeon's hand may occur, making the instrument unusable
Solution Approach 1:
The patent applies dynamic power state adjustment based on the active element's environmental contact status. When the detector determines the active element is not in contact with tissue (indicating the surgeon may be holding it), the system transitions to a second power state with reduced power delivery, minimizing heat generation and preventing heat transfer to the surgeon's hand while maintaining instrument portability and manageability
3Productivity
If high power is delivered to achieve effective tissue treatment, then the surgical procedure can be completed efficiently, but the thermal element may be damaged from excessive thermal stress
Solution Approach 1:
The system dynamically adjusts power delivery based on real-time detection of tissue contact status. When contact is detected, high power is delivered for efficient tissue treatment; when contact is lost (indicating potential air exposure and thermal stress risk), the system reduces to a second power state. This dynamic adaptation maintains surgical efficiency while preventing thermal element damage from excessive thermal stress
Solution Approach 2:
The system proactively reduces power to a protective second state when the active element is determined to be in air, before damage can occur. This preventive measure cushions the thermal element against excessive thermal stress that would result from continued high-power operation in air, ensuring reliability while allowing high-power efficient treatment when properly used
Data Source
AI summary
A thermal surgical instrument having a system to control the delivery of power from an energy source to an active element located on a tip. The system for controlling delivery to the tip may include a control algorithm which uses one or more measurements, such as tip current, SWR, and rapid changes in reflected power, to manage power without affecting cutting efficacy, and in a manner that may be imperceptible by a surgeon. The system may utilize a state machine to determine the current environment in which the tip may be in. Power delivered to the tip may be selectively managed according to a fixed power index or a repeatedly executed power profile.