Ultrasonic transducer is one of the key components of medical ultrasonic equipment, and its characteristics directly affect or even limit the performance of the entire equipment. With the continuous development of piezoelectric materials and MEMS technology, small size, light weight, wide frequency band, high resolution, high frequency, and high sensitivity will be the main development direction of medical ultrasonic transducers in the future.
Ultrasonic transducers will inevitably have some problems during long-term use. Some of these problems will directly affect the use of products and production lines, so they need to be eliminated in time. There are three common ultrasonic transducer problems.
A complete ultrasonic device can be formed only when the driving power of the ultrasonic transducer and the ultrasonic generator and the ultrasonic mold cooperate well. This is called matching for short. Matching has a great impact on the performance of the whole machine, so no matter how important it is to emphasize the importance of matching is immeasurable. The main matching considerations are the capacitance of the ultrasound transducer and subsequent transducer frequency.
Ultrasonic transducer is a device that converts electrical energy into mechanical energy, and realizes the mutual conversion of electrical energy and mechanical energy by piezoelectric effect. It is called piezoelectric transducer. It consists of a central piezoelectric ceramic element, front and rear metal covers, and prestressed screws, electrodes and insulating tubes. According to different structural designs, it also has a great influence on their form and performance.
Ultrasonic scalpel products are composed of generator, transducer system, cutter and foot switch. The transducer system has a long service life and maximizes application value; the integrated torque wrench facilitates inventory control; the transducer system and the tool can be separated, reducing replacement costs.
With the increasing development of science and technology and the continuous improvement of modern people's demand for medical technology, the scalpel is no longer a purely medical cutting role. In order to achieve accurate and fast cutting, and at the same time have the function of hemostasis, the ultrasonic blade came into being.
In order to meet the various requirements of different industries, ultrasonic transducers often need to be considered from the material, shape and structural composition of the transducer. In addition, under the needs of detection conditions, objects and environments, there are corresponding special requirements for small ultrasonic transducers, such as being used in high temperature and low temperature environments, underwater detection and so on. In general, the ultrasonic transducers used are required to have sharp directivity, just like using a concentrating flashlight for illumination, which is conducive to concentrating the transmitted energy, obtaining a higher signal-to-noise ratio when receiving, and is also conducive to the detection of Target positioning assessment.
The ultrasonic generator generates a signal of a specific frequency. This signal can be a sinusoidal signal or a pulse signal. This specific frequency is the frequency of the ultrasonic transducer. Generally, there are many ultrasonic frequencies used in ultrasonic equipment. With the continuous development of technology, it is believed that the application area will gradually expand. A relatively complete generator should also have a feedback link, which mainly provides feedback signals in two aspects.