Surgical Instrument Mode Selection Using Tissue Impedance Feedback
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Solution Overview
Problem
Current surgical instruments lack the ability to seamlessly switch between radio frequency (RF) and ultrasonic energy modes based on user input and tissue impedance, limiting precision and efficiency in surgical procedures.
Innovation Solution
A surgical instrument system that includes a generator capable of receiving user inputs to select between RF and ultrasonic energy modes, with a mode selection algorithm that adjusts energy delivery based on jaw position and tissue impedance, allowing for simultaneous or sequential application of RF and ultrasonic energies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If surgical instruments use fixed energy delivery modes, then device complexity is reduced, but surgical precision and adaptability deteriorate
Solution Approach 1:
The surgical instrument dynamically switches between RF and ultrasonic energy modes based on real-time detection of tissue impedance and user inputs. The system transitions from static fixed-mode operation to dynamic adaptive operation, where the energy delivery mode changes automatically according to tissue conditions and surgical needs, thereby improving surgical precision without requiring multiple separate instruments
Solution Approach 2:
The surgical instrument integrates multiple energy delivery functions (RF energy and ultrasonic energy) into a single device. The end effector can operate in RF mode for coagulation and sealing, ultrasonic mode for cutting and coagulation, or combined modes, making the instrument universal and adaptable to various surgical tasks without increasing the number of separate devices needed
2Productivity
If surgical instruments lack automatic mode switching, then ease of operation is improved, but productivity and surgical efficiency deteriorate
Solution Approach 1:
The system continuously monitors tissue impedance and uses this feedback to automatically determine the appropriate energy mode. The control circuit receives real-time impedance data and automatically switches between RF and ultrasonic modes without requiring manual intervention from the surgeon, thereby improving surgical efficiency while maintaining ease of operation through automated decision-making
Solution Approach 2:
The surgical instrument performs self-adjustment of energy modes based on detected tissue conditions. The system automatically selects and switches between RF and ultrasonic energy delivery without external control, enabling the instrument to serve itself in optimizing its operation according to real-time surgical conditions, thus improving productivity without complicating the user interface
3Adaptability or versatility
If surgical instruments use manual mode selection only, then adaptability to tissue conditions is reduced, but device complexity is minimized
Solution Approach 1:
The system uses real-time tissue impedance detection to automatically adapt the energy delivery mode to tissue conditions. The control circuit continuously monitors impedance changes and switches between RF and ultrasonic modes based on detected tissue properties such as moisture content, density, and thermal characteristics, providing automatic adaptability without requiring complex manual adjustment mechanisms
Solution Approach 2:
The system replaces manual mechanical mode selection with automated electronic control based on tissue impedance sensing. Instead of requiring the surgeon to manually switch modes based on visual assessment, the system uses electrical impedance measurement and automated control algorithms to select the appropriate energy mode, thereby improving adaptability to tissue conditions while keeping the device architecture manageable through electronic rather than mechanical complexity
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
Enhances surgical precision and efficiency by allowing the system to automatically adjust energy delivery based on user intent and tissue conditions, improving tissue treatment outcomes.
Implementation Method 1
electrical energy applied by an electrosurgical device can be transmitted to the instrument by a generator in communication with the hand piece. The electrical energy may be in the form of RF energy... Heat generated by the current flowing through the tissue may form hemostatic seals within the tissue
Implementation Method 2
an electrosurgical device can transmit low frequency RF energy through tissue, which causes ionic agitation, or friction, in effect resistive heating, thereby increasing the temperature of the tissue
Implementation Method 3
Ultrasonic energy cuts and coagulates by vibrating a blade in contact with tissue. Vibrating at high frequencies (e.g., 55,500 times per second), the ultrasonic blade denatures protein in the tissue to form a sticky coagulum
Implementation Method 4
receiving a third input indicating electrical impedance at the RF energy output
Data Source
AI summary
Disclosed is a method for operating a surgical instrument, the surgical instrument comprising a radio frequency (RF) energy output, an ultrasonic energy output, and a first jaw and a second jaw configured for pivotal movement between a closed position and an open position, the method comprising: receiving a first input indicating a user selection of one of a first option and a second option; receiving a second input indicating whether the first jaw and the second jaw are in the closed position or in the open position; receiving a third input indicating electrical impedance at the RF energy output; and selecting a mode of operation for treating a tissue from a plurality of modes of operation based at least in part on the first input, the second input and the third input.