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Micro Piezo Air Pump: microfluidics for high-precision "wrist sphygmomanometers"

2024-04-11 Product Information

Micro Piezo Air Pump is becoming an important force in promoting the technological innovation and progress of medical equipment with their advantages of precise control, low noise, high reliability and low energy consumption in  blood pressure measurement equipment and other medical equipment. With the continuous development of medical technology, the application prospect of miniature piezoelectric air pumps will be broader, and make greater contribution to the improvement of people's health and quality of life.

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Micro Piezo Air Pump: the source of accurate power for portable blood pressure measurement equipment

In the development of modern medical equipment, the miniature piezoelectric air pump is gradually developing into an indispensable core component in blood pressure measurement equipment and other medical equipment with its excellent performance and application advantages. It achieves precise control of fluid through advanced Micro Fluid Control technology, thus playing a crucial role in blood pressure measurement.

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AUDIOWELL, which has been dedicated to ultrasonic technology for more than 20 years, has long had rich experience in mass production of the first generation of Micro Piezo Air Pump and miniature piezoelectric fans and other related technologies. Through technological innovation, the company has successfully developed a new generation of Micro Piezo Air Pump integrating ultrasonic frequency band, high flow output and high pressure load.

Working principle of Micro Piezo Air Pump

Micro Piezo Air Pump consists of piezoelectric vibrator, pump valve and pump body, there is no motor, no rotating parts, piezoelectric vibrator for its power drive source, driven by AC power, piezoelectric vibrator radial shortening or lengthening under the action of the electric field, and at the same time drive the elasticity of the substrate bending and deformation, so as to change the volume of the pump cavity. Piezoelectric vibrator positive bending (that is, piezoelectric vibrator elongation), the pump cavity volume increases, the pressure inside the cavity decreases, the gas flows into the pump cavity; when the piezoelectric vibrator reverse bending (that is, the piezoelectric vibrator contraction), the pump cavity volume decreases, the pressure inside the cavity increases, the gas is squeezed out of the pump cavity, thus forming a gentle continuous gas flow direction.

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Integrated design, high precision flow control

Micro Piezo Air Pump has a simple structural design and operates efficiently. By integrating the drive source, transmission part and pump body into one compact unit, the integrated design not only makes the pump body lighter, but also has a fast response speed, which can precisely control the output of tiny flow and precise air pressure according to the applied voltage or frequency. If the driving voltage is increased and the air pressure is high, the flow rate will be high and vice versa. As can be seen from the following P-Q characteristic chart, influenced by the large radial vibration characteristics of the piezoelectric vibrator, the product has a large output flow rate, and the gas flow rate can still maintain a positive output under a pressure load of 40 kPa.

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This is particularly true in blood pressure measurement equipment applications, where Micro Piezo Air Pump provides a steady and continuous flow of gas to ensure the accuracy and reliability of blood pressure measurements.

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In other medical device applications, the Micro Piezo Air Pump also demonstrates its unique advantages. For example, in drug delivery systems, its ability to precisely control the release of minute amounts of slow-release agents makes it more reliable, which is essential for the precise delivery of drugs such as insulin or cancer analgesia.

"Silent" operation, stable performance

As there is no motor and rotating parts inside the Micro Piezo Air Pump, the resonant frequency is 24.5±2KHz (>20 kHz), which belongs to the ultrasonic frequency band and is beyond the range of human ear hearing, the noise is as low as below 40dB and is not easy to be subjected to electromagnetic interference, and the piezoelectric oscillator inside the product is of good toughness, good resistance to rupture, strong antioxidant performance, and high reliability, which makes it an ideal choice in the need for a quiet environment and stable performance in the medical scenarios as an ideal choice.

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Low power consumption, which helps to improve the whole machine's endurance

It is worth mentioning that the low power consumption of the Micro Piezo Air Pump also provides a possibility for its application in smart wearable devices. Compared with traditional air pumps, the micro piezoelectric air pump has a high efficiency of conversion of electrical and mechanical energy, low driving voltage, and power consumption of only 1.5w, which will help improve the endurance of the whole device.

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Small size and light weight

For portable blood pressure measurement seeking small size and lightness, the Micro Piezo Air Pump's compact dimensions (21x19x3.2mm, excluding nozzle) and light weight (3.5g) are perfectly in line with this technological trend.

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Fast pressure reduction for a more comfortable experience

In real-world application tests, the Micro Piezo Air Pump demonstrated excellent performance. When connected to a 100cc container, it was able to reduce the pressure from 260mmHg to 15mmHg in 10 seconds, a rapid response capability that greatly enhances the user experience. Users are able to quickly release the pressure constraints and enjoy a more comfortable and convenient testing process after using a wearable device fitted with the pump for blood pressure testing.

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Other Medical Insurance Applications Products

Transducers for ultrasonic scalpels

Ultrasonic scalpel handle is the use of ultrasonic transducer piezoelectric material in the inverse piezoelectric effect, in the piezoelectric ceramic oscillator at both ends of the positive and negative voltage, after the piezoelectric ceramic is conducted, deformation in the longitudinal direction, so as to convert electrical energy into mechanical energy, to achieve high-frequency vibration. The cutting hemostat transducer developed by AUDIOWELL is a special piezoelectric ceramic specially designed for ultrasonic knives. The large amplitude and high reliability of the product provide a good hardware foundation for the ultrasonic knife to achieve finer control and more flexible operation.

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- Large amplitude, high cutting efficiency

- Small loss, less heat, high reliability, long product life

- High capacitance consistency, product consistency

Corrosion Resistant Smart Atomizer

Corrosion Resistant Smart Atomizer is an intelligent atomizing module specially designed for medical applications, which is corrosion-resistant and has stable performance. It integrates atomizing transducer and circuit board, the ultrasonic transducer generates high-frequency axial mechanical deformation, so that the energy is rapidly accumulated on the surface of the liquid and cavitation occurs, so that the liquid is rapidly atomizing and evaporated. The module can be externally connected to the fan, water level sensor and knob switch, with a variety of extended function interface, suitable for a variety of flexible design needs. In addition, the product supports a variety of communication protocols such as UARI, GPIO, etc., which can be applied to the IOT system with high efficiency, stability, safety and digital features.

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- Corrosion-resistant, stable performance

- Ultra-large fog volume, energy-efficiency ratio of super "A" level.

- Intelligent frequency tracking technology, more stable atomizing, good consistency

- Intelligent anti-dry burning protection, safe and reliable

- Integrated structure design, support for more applications

- Atomizing particle size as small as microns

Ultrasonic Level sensors for water tank

Ultrasonic Level sensors for water tank is a non-contact liquid level sensor, which integrates transmitting drive, receiving and collecting, signal processing, parameter storage and communication interaction in one, and forms a warning system with liquid level detection and liquid filling loop. It can be used to measure the level height of various types of liquids, etc., and is not affected by its chemical properties such as acidity and alkalinity, which is suitable for flow monitoring applications of strong acid and alkali liquids.

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- Non-contact measurement

- High measurement accuracy, the measurement result is not affected by the chemical properties of the liquid.

- Continuous detection, suitable for strong acid, strong alkali flow measurement applications.

Ultrasonic welding transducer

Ultrasonic welding transducer is the conversion of electrical energy into mechanical energy, mechanical energy is converted into thermal energy of a kind of energy transfer parts, which has a low cost, stable performance, strong amplitude and other characteristics. Ultrasonic welding transducer using high-frequency vibration to generate ultrasonic energy transmission to the weld zone, so that the two welded objects at the interface of the vibration friction, thereby generating a local high temperature, so that the contact surface of the plastic quickly melted, plus a certain pressure, the formation of a solid connection, to achieve the purpose of welding, weld strength can be close to the strength of the raw material.

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- High power drive, large amplitude

- High Qm value, stable performance

- Low resonance impedance, low dielectric loss.

- Long life

-Suitable for ultrasonic welding equipment, ultrasonic cleaning and other applications.


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