Design of Intravascular Ultrasound-enhanced Thrombolysis Excitation System Based on FPGA.
10.3969/j.issn.1671-7104.2020.03.005
- Author:
Yao ZENG
1
;
Peiyang LI
2
;
Zhitian SHEN
1
;
Yaoyao CUI
1
;
Jie XU
2
Author Information
1. University of Science and Technology of China, Hefei, 230026.
2. Suzhou Institute of Biomedical Engineering and Technology Chinese Academy of Sciences, Suzhou, 215163.
- Publication Type:Journal Article
- Keywords:
DAC;
DDS;
FPGA;
ultrasound-enhanced thrombolysis
- MeSH:
Amplifiers, Electronic;
Electric Impedance;
Thrombolytic Therapy;
Ultrasonography;
Ultrasonography, Interventional
- From:
Chinese Journal of Medical Instrumentation
2020;44(3):210-215
- CountryChina
- Language:Chinese
-
Abstract:
An intravascular ultrasound-enhanced thrombolysis excitation system with adjustable frequency, amplitude and duty cycle was designed based on FPGA (ZYNQ-7Z020). Firstly, the FPGA generated waveform amplitude binary data based on direct digital frequency synthesis (DDS) technology, and then the data was converted into burst signal through an external daughter card, which included D/A conversion circuit, active low-pass filter, power amplifier circuit and impedance matching circuit. The test results demonstrated that the output waveform reached the target with advantages of simple implementation and flexible control, the peak negative pressure generated from ultrasound transducer was doubled by means of an electrical impedance matching network. In vitro thrombus models were applied to verify the excitation system, it turned out that ultrasound cavitation effect generated could accelerate the penetration of urokinase and increase the thrombolysis rate by about 20%.
