Ultrasonic emulsification equipment is the first components of ultrasonic generator, ultrasonic in transmission medium molecule by the vibration of the sound wave energy and the elastic vibration of a longitudinal wave direction, will produce a series of mechanical effect, cavitation effect, Ta fracture effect. Of course, modern ultrasonic emulsification equipment is not only composed of ultrasonic generator. It is a precision operating system integrating sound, light, electricity and machinery. There are many kinds of ultrasonic emulsifying equipment, but the basic structure is roughly the same, and it is usually composed of ultrasonic system, liquid flow system, control system and auxiliary device.
I. ultrasonic system.
Ultrasonic system mainly consists of ultrasonic generator, power amplifier, piezoelectric transducer and ultrasonic handle. The working frequency of ophthalmic ultrasonic emulsification equipment is often 27 ~ 64kHz, because of the different handle, it is often used 28. 5, 32, 40, 48kHz and other frequencies, which are compared with other ultrasonic treatment devices such as ultrasound hyperthermia (1-5mhz) and ultrasound therapy (0). The frequency of equipment such as 5 ~ 5MHz is low. It mainly considers the attenuation of low frequency acoustic wave and less heat, etc. The power amplifier is used to amplify the weak current signal. Piezoelectric transducers are used to generate the inverse piezoelectric effect (the conversion of electric energy to sound energy). When the frequency of alternating electric field is greater than 20kHz, the piezoelectric transducer generates ultrasonic waves. Transducers are made up of piezoelectric crystals, such as lead zirconate PZT. After the polarization treatment of such materials, if the electric field is applied in the direction of polarization, the inverse piezoelectric effect will be generated, and the resulting mechanical vibration will be amplified to the emulsified needle. >100000psi can be generated at the emulsion needle end (about 689. The stress of 5MPa is sufficient for the closure of the crystalline nucleus. Ultrasonic controller is the key component of ultrasonic energy output. It is composed of vibrators, weights, transducers, needles and jackets. The handle integrates three functions: infusion, suction and emulsification. The emulsified needle is a special shape of the sound radiation head. In the case of medium air tube, its function can produce a great amount of ultrasonic energy, but also can remove the broken tissue. Coat silicone tube on one hand to maintain the perfusion. On the other hand, it is necessary to cool the emulsion needle.
Ii. Fluid flow system.
The fluid flow system is also called a priming system, consisting mainly of pumps, pipes and handles. With the start of the ultrasonic emulsifier, the pump also produces negative pressure. The chylous nucleus is sucked out through the delivery of pipes and handles. The speed of the regulating pump can adjust the flow rate to control the output of negative pressure. The pump system used in ultrasonic emulsification equipment is: peristaltic pump, venturi pump and diaphragm pump, and the diaphragm pump has been eliminated. The advantage of the peristaltic pump is that the negative pressure is stable and reliable. Its mechanism is that the pressure is generated in the pipe by the rotation of the drum, no matter how the gear is rotating at any speed. The liquid in the pipe is constant, which ensures constant flow. Allow the surgeon to have adequate response time, thereby improving the stability of the front room. Its disadvantage is that the emulsifying head must be able to produce negative pressure when there is a blockage, so the attraction is relatively slow. Venturi pump, also known as venturi pump, can provide a strong negative pressure suction, but the stability of the front room has no peristaltic pump. Venturi pump USES the compressed gas instead of the peristaltic pump liquid flow to produce negative pressure, its mechanism is: compressed gas through the pipeline to produce high speed air flow, make the container air is sucked out and produce negative pressure. Then the emulsion is sucked out. Its advantage is that it quickly generates high pressure attraction. The super - milk glass - cutter is usually used in the venturi pump because it must meet the strong negative pressure required for the posterior segment.
The control system USES multiple independent microprocessors. The ultrasonic system, liquid flow system and interface system are controlled respectively. Depending on the handle, there are multiple emulsification modes available. Such as the mode of wiggling, the emulsification mode and the traditional emulsification mode, etc. : the modulated mode of ultrasonic energy can be controlled, such as pulse mode, blasting mode and cold superemulsion mode. Control suction rate O 1 60m‰in and negative pressure 10-650mmhg (1mmHg=133. 322 pa); In the control aspect of user interface system, the procedures and parameters of the operation can be personalized, visual and graphical interface, animation, voice prompt and confirmation; In addition, the control system also has the function of wireless remote control operation.
The electrocoagulation handle and the vitreous cutting handle are the main parts of the superemulsion auxiliary device. The coag handle: the purpose of stopping the bleeding is to supply a conductor (such as tweezers) with a separated bipolar current. The current strength of hemostasis is crucial, too low to stop bleeding effect, too high will cause tissue burn. The glass handle is a kind of reciprocating or oscillating vitrectomy knife, which can provide suction and excision function. The removal speed of the handle can be adjusted, ranging from 10 to 800 times, min. There is negative pressure attraction when cutting. The cutting frequency, flow rate, negative pressure attraction can be preset.