An analgesic pump that can be automatically adjusted and its working method

Abstract

The present disclosure provides an analgesic pump that can be automatically adjusted and a working method, including an infusion tube, a microcontroller, a water press, a liquid-liquid converter, a flow detection device, and a flow adjustment device; the water press is used to provide The liquid under pressure is input to the flow detection device after passing through the flow adjustment device, and the flow detection device is used to detect the liquid flow in real time and transmit it to the microcontroller; the flow adjustment device includes a micro geared motor, a screw, a nut slider, a slider Rod, fixed clamp, movable clamp and silicone tube, the microcontroller, according to the detected infusion flow value, real-time control the micro gear motor to rotate the screw, move the nut slider to drive the movable clamp, and then drive the expansion and contraction of the silicone tube to make the diameter of the tube And length changes, realize the automatic adjustment of the infusion flow rate of the analgesic pump, and greatly improve the control accuracy of the infusion pump.

Description

technical field [0001] The disclosure relates to the technical field of analgesic pumps, in particular to an automatically adjustable analgesic pump and a working method. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Disposable analgesic pumps are currently a very common medical device used in the medical field, mainly through the intravenous administration of drugs by patients to achieve the purpose of treatment and rapid pain relief. [0004] The inventors of the present disclosure found that (1) the actual injection speed of the existing disposable analgesic pump is affected by the type of liquid medicine, the viscosity of the liquid medicine, and the temperature, and the physical properties of the elastic liquid storage device will also cause changes in the injection speed (For example, at the beginning, the elasticity of silica g...

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Problems solved by technology

[0004] The inventors of the present disclosure found that (1) the actual injection speed of the existing disposable analgesic pump is affected by the type of liquid medicine, the viscosity of the liquid medicine, and the temperature, and the physical properties of the elastic liquid storage device will also cause changes in the injection speed (For example, at the beginning, the elasticity of silica gel is large, and the flow rate will be faster than the nominal flow rate), and the automatic adjustment performance of its flow limiting device (ie, flow regulating device) is poor, and the one-time use cost is relatively high; (2) the current The minimum detection flow value of the flowmeter is relatively large. The minimum flow detection value of the flowmeter commonly used in the market is about ten milliliters per hour, while the current analgesic pump is adjusted at 2ml / h, that is, the current flowmeter cannot meet the requirements during the infusion process. Therefore, it is impossible to realize the closed-loop control of the infusion volume; (3) The conventional small-flow regulating valve is to adjust the opening size of the valve by moving the spool, and the movement stroke with a small flow rate will also produce Large flow changes, that is, the current small flow regulating valve can not meet the flow regulation needs in the infusion process; (4) the current bubble sensor can use ultrasonic detection and photoelectric detection, the cost of ultrasonic detection is relatively high, and the sensor and infusion The tube requires close contact (to reduce the surface reflection and acoustic impedance of the tube), while the photoelectric detection has a simple structure, low cost, and low requirements for the cooperation between the infusion tube and the photoelectric detection device. The detection method is easily affected by factors such as the light transmittance of the infusion tube and the infused liquid (such as different liquid medicines), light source changes, dust, and photosensitive elements that are sensitive to temperature changes. At the same time, it is not easy to increase the light intensity. To reduce the influence of the above factors, because increasing the light intensity will reduce the resolution of detecting bubbles (low sensitivity), that is, it is not conducive to the detection of small bubbles, and it will also cause light pollution to some liquids, thus limiting its practical application

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