The ultrasonic scalpel system works through the collaboration of four major modules: power conversion, power amplification, ultrasonic transduction, and intelligent control, converting electrical energy into ultrasonic mechanical energy to achieve precise surgical cutting and coagulation.
Ultrasonic Scalpel System Block Diagram
Power Conversion (AC-DC)
- Converts commercial alternating current into direct current to provide a stable power supply for the power amplifier and the system.
- Regulates the output voltage or power under the PWM control of FPGA and MOSFET driving.
Power Amplifier (Class AB Push-Pull)
- Circuit structure: Adopts push-pull topology (Q1 and Q2 in the figure are turned on alternately, coupled through transformers T1 and T2) to output high-frequency alternating current.
- Working mode: Class AB amplification, which combines the advantages of Class A (low distortion) and Class B (high efficiency), suitable for the high-power and low-distortion requirements of ultrasonic driving.
- Control: Controlled by the PA control of FPGA and MOSFET driving signals to adjust the output power and frequency.
Transducer & Blade
- Transducer: Converts high-frequency electrical signals into ultrasonic mechanical vibrations.
- Blade: Transmits ultrasonic vibrations to tissues to achieve cutting and coagulation.
- Feedback: The resonant frequency of the transducer is fed back to FPGA through PLL (Phase-Locked Loop) to realize frequency tracking and ensure efficient operation.
Intelligent Control (using FPGA control)
- Generates driving signals for the power amplifier and adjusts the output frequency and power.
- Processes interface inputs (buttons, USB/RS232 communication) to realize user control.
Frequently Asked Questions:
Q: In the design of ultrasonic scalpels, how are power semiconductors optimized to achieve precise mechanical energy control?
A: The Class AB PA design is mainly adopted to achieve nearly perfect sine wave driving.
More Littelfuse circuit protection products:
Littelfuse circuit protection products, with their excellent performance, provide stable and reliable signal transmission guarantees for medical electronic equipment.
- Fuses
- Electrical special fuses
- PTC resettable fuses
- Gas Discharge Tubes (GDT)
- Varistors, MOV
- Circuit breakers
More information about Littelfuse medical product safety design:
- Littelfuse Medical Product Safety Design: Defibrillator (AED)
- Littelfuse Medical Product Safety Design: X - ray Imaging System Power Supply System
- Littelfuse Medical Product Safety Design: Ultrasonic Scalpel System
- Littelfuse Medical Product Safety Design: Intravascular Pulsed Decalcification Instrument
- Littelfuse Medical Product Safety Design: Pulsed Field Ablation (PFA)
- Littelfuse Medical Product Safety Design: Ventilator System
- Littelfuse Medical Product Safety Design: Ultrasonic Scanning Equipment