Bubble monitoring device for portable blood purification system

A technology of blood purification and monitoring device, applied in the direction of dialysis system, etc., can solve the problems such as the shaking of the instrument, affecting the normal application of the sensor, and the inability of the bubble sensor to achieve the effect of enhancing reliability and shielding interference.

Inactive Publication Date: 2013-04-24
BEIJING MEDER MEDICAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] First, the detection threshold of the existing air bubble sensor is generally calibrated when the sensor leaves the factory. When there is an air bubble in the blood, it will immediately alarm, which is very sensitive. However, this has caused certain defects for the portable dialysis machine, because the design of the portable dialysis machine The purpose of the device is designed for trea

Method used

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  • Bubble monitoring device for portable blood purification system
  • Bubble monitoring device for portable blood purification system
  • Bubble monitoring device for portable blood purification system

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The invention provides a bubble monitoring device used in a portable blood purification system, which mainly consists of an ultrasonic bubble detector. The ultrasonic bubble detector includes an ultrasonic transmitting device and a receiving device. (1) The ultrasonic pulse signal detected by the receiving device After processing by the signal processing module, the regular rectangular signal pulse width is obtained; (2) The signal pulse width Tc is compared with the set threshold value through the comparator. The threshold value of large bubbles is Tc1, and the threshold value of no bubbles and micro bubbles is Tc0 , when Tc≥Tc1, directly enter the CPU processor and start the alarm device; when Tc≤Tc0, directly filter out; when Tc0Tc0, the set value T is 1-3ml / min. It also includes an active band-pass filter circuit, a Schmitt trigger, a comparator, and an interference signal processing module. The interference signal processing module adopts a digital filtering method,...

Embodiment 2

[0034] Embodiment 2 detection test of the present invention

[0035] Carry out vehicle-mounted dialysis test to the present invention, carry out under the situation of vehicle running.

[0036] Test subject: dog, weighing 23 kg

[0037] Test parameters: blood flow is set at 300ml / min; fluid infusion rate is set at 1 liter / hour; dehydration rate is set at 0.2 liter / hour; dialysis time is set at 5 hours.

[0038] In the test, the original ultrasonic air detector was used, and the original air bubble sensor alarmed continuously in 5 hours, generating hundreds of alarms, which greatly interfered with the dialysis.

[0039] Under the same conditions, using the device of the present invention, a total of 5 large bubble alarms were generated, and the accumulated bubble alarms were 3 times.

[0040]According to the obtained test results, the project team conducted another 6 experiments, and the experimental results all showed that the reliability of the improved ultrasonic bubble de...

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Abstract

The invention discloses a bubble monitoring device for a portable blood purification system. The monitoring device mainly comprises an ultrasonic bubble detector which comprises an ultrasonic transmitting device and an ultrasonic receiving device. The monitoring device functions through steps as follows: (1) acquiring the regular rectangular signal pulse width by processing the ultrasonic pulse signal detected by the receiving device through the signal processing module; (2) comparing the pulse width of the signal Tc and the set threshold by the comparator, large bubble threshold is Tc1, no bubbles and micro bubbles threshold is Tc0. When Tc >/= Tc1, the bubbles directly enter the CPU processor and start the alarming device; when Tc </=Tc0, the bubbles are directly filtered out; when Tc0 <Tc <Tc1, the bubbles enter the CPU processor and be cumulated, when the cumulative amount per minute is greater than the set value T, the alarming device is triggered. The reliability of the bubble monitoring device is greatly enhanced, timely and accurate warning of the bubble is guaranteed, and various disturbances are also effectively avoided.

Description

technical field [0001] The invention relates to an air bubble monitoring device, in particular to an air bubble monitoring device used in a portable blood purification system under rocking and vibrating field conditions. Background technique [0002] As the main detection device on the current dialysis equipment, the bubble detector is mainly used to detect whether there are bubbles in the venous return section of the extracorporeal circulation in real time, continuously and reliably during the whole dialysis process, so as to prevent the gas from entering the patient's body and causing gas Embolism to ensure the safety of dialysis patients. When there is air, the machine sends out an alarm signal, which makes the blood clip close and prevents the blood from flowing back into the patient's body. [0003] There are three commonly used detection methods: (1) capacitive detectors; (2) infrared photoelectric detectors; (3) ultrasonic detectors. Because the ultrasonic detector ...

Claims

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Application Information

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IPC IPC(8): A61M1/14
Inventor 石炳毅周春华李平李洋
Owner BEIJING MEDER MEDICAL SCI & TECH
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