科研之友
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摘要
Objective: Intravascular ultrasound (IVUS) is an important method for evaluating lumen dimensions and guiding intervention. However, the current IVUS catheter using a proximal motor and flexible drive shaft is easily rotated at an unstable speed when it passes through along bending vessel. One approach to solve this problem is to develop a catheter driven by a distal motor. Methods: This paper presents a rotation device incorporating a high-frequency transducer as an attempt to facilitate this approach. A novel micro distal synchronous micro motor with 3.7 mm length and 1.2 mm outer diameter was proposed as an actuator for the IVUS catheter. A 0.5 mm x 0.5 mm Pb(Mg1/3Nb2/3)O-3-PbTiO3 single crystal 1-3 composite single-element transducer was designed and manufactured. The probe is fixed to the front end of the catheter. The 45 degrees reflector, which is opposite to the probe, was used to steer ultrasound to the tissue. Results: The results showed that the maximum torque and rotation speed of the motor were 2.79 mu Nm and 275 revolutions per second, respectively, at a driving current of 0.34 A. The maximum angular error was 7 degrees at 0.13 A and 30 Hz. The center frequency and -6 dB fractional bandwidth of single element were 34 MHz and 72%, respectively. At the center frequency, the two-way insertion loss was 14 dB. Conclusion: The integrated distal motor IVUS catheter, with small dimensions, a good torque, speed stability, and good ultrasound imaging performance, has tremendous potential in blood vessel imaging. Significance: The novel structure of the catheter could facilitate endoluminal sonography, reducing risks of the clinical diagnosis.
- 出版日期2019-3
- 单位深圳大学
