Design and Analysis of a Patient-Controlled Analgesia Micropump by Using the Frequency-modulated PZT Bimorph
Date Issued
2011
Date
2011
Author(s)
Wu, Chia-Yi
Abstract
In this study, an innovative one-side actuating Piezoelectric Transducer (PZT) micropump with an adjustable frequency modulator has been developed for a portable biomedical device. The PZT micropump which consists of a pump chamber and one passive check valve is used as a disposable Patient-Controlled Analgesia (PCA) pump. Because of the restriction of the micropump size, there is a component which transmits force from the PZT to the chamber. First, in order to simulate the performance of one-point mode and two-point mode, the software, CFD-RC, is used. The result shows that one-point mode has better performance. And the experiment result shows the same tendency. Furthermore, the influence of different position and different diameter of the transmitting component has been studied. Due to the standardization of the medicine restriction, the membrane is chosen as silica gel. And different thickness of the membrane has been studied. The result shows that the maximum flow rate is 26ml/min, which happens at the thickness of 0.24mm. The flow direction of the micropump is determined by the valve, so the influence of thickness and the diameter of the valve have been researched. The chamber size is also an important parameter affecting the performance of the micropump, two size, 10mm × 10mm × 3mm and 20mm × 10mm × 3mm, have been studied. And the maximum flow rate is 28ml/min, when the chamber size is 20mm × 10mm × 3mm, and the operating frequency is 75Hz.
Subjects
One-side actuation
Piezoelectric device
Flow-direction
PCA micropump
frequency modulation
Type
thesis
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