Portable blood purifying system bubble monitoring device and method

A technology of blood purification and monitoring device, applied in blood circulation treatment, medicine equipment, other medical equipment and other directions, can solve the problems affecting the normal application of the sensor, the bubble sensor cannot be used, the instrument is shaking, etc., to achieve enhanced reliability, The effect of changing sensitivity and shielding interference

Inactive Publication Date: 2016-06-22
BEIJING MEDER MEDICAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 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 treat

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  • Portable blood purifying system bubble monitoring device and method
  • Portable blood purifying system bubble monitoring device and method
  • Portable blood purifying system bubble monitoring device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: as image 3 As shown, a bubble monitoring device used in a portable blood purification system according to the present invention includes an ultrasonic bubble detector 4, a signal processor 5, a comparator 6, a CPU processor 7 and an alarm device 8;

[0038] The ultrasonic bubble detector 4 includes a transmitting device 4-1 and a receiving device 4-2, and the transmitting device 4-1 and the receiving device 4-2 are installed on both sides of the blood catheter 3;

[0039] The signal processor 5 includes an interference signal processing module 5-1 and a signal shaping module 5-2, and the interference signal processing module 5-1 is connected with the receiving device 4-2, and is used for receiving the ultrasonic pulse signal received by the receiving device 4-2. The interference signal is eliminated. Since the shaking of the instrument will generate a lot of interference signals, it will also affect the normal application of the sensor. Therefore, such i...

Embodiment 2

[0043] Embodiment 2: as Figure 4 As shown, a method for monitoring air bubbles in a portable blood purification system according to the present invention includes:

[0044] Step 1, the transmitting device transmits the ultrasonic pulse signal A, and the receiving device receives the ultrasonic pulse signal B passing through the blood catheter;

[0045] Step 2, canceling the interference signal on the ultrasonic pulse signal B, and shaping the signal after the interference is eliminated to form a regular rectangular signal and the pulse width of the rectangular signal is Tc;

[0046] Step 3: Comparing the signal pulse width Tc with the small bubble threshold Tc0 and large bubble threshold Tc1 set by the comparator:

[0047] Tc≧Tc1, directly enter the CPU processor and start the alarm device;

[0048] Tc≦Tc0, filter out directly;

[0049] Tc0﹤Tc﹤Tc1 enters the CPU processor and performs cumulative calculations. When the cumulative amount per minute is greater than the set va...

Embodiment 3

[0053] Embodiment 3: detection test of the present invention

[0054] The vehicle-mounted dialysis test is carried out on the air bubble monitoring device of the present invention, which is carried out under the condition of vehicle running.

[0055] Test subject: dog, weighing 23 kg

[0056] 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.

[0057] 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.

[0058] 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.

[0059] Based on the obtained test results, several experiments were carried out. The experimental results all show that the reliability...

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Abstract

The invention discloses a bubble monitoring device used in a portable blood purification system, comprising an ultrasonic bubble detector, a signal processor, a comparator, a CPU processor and an alarm device; the ultrasonic bubble detector is installed on both sides of a blood catheter; the signal processing The device is connected with the ultrasonic bubble detector to eliminate the interference signal and form a regular rectangular signal pulse width Tc; the comparator is connected with the signal processor, and the CPU processor is connected with the comparator and the alarm device respectively. The comparator compares the rectangular signal pulse width Tc with the set large bubble threshold Tc1, no bubble and micro bubble threshold Tc0, when Tc≧Tc1, the alarm device is activated directly; when Tc≦Tc0, it is directly filtered; when When Tc0﹤Tc﹤Tc1, the cumulative calculation is carried out, and when the cumulative amount per minute is greater than the set value T, the alarm device is activated. The reliability of the air bubble monitoring device of the present invention has been greatly enhanced, which not only ensures timely and accurate alarm of the air bubbles, but also effectively shields various disturbances.

Description

technical field [0001] The invention relates to the field of blood purification, in particular to a bubble monitoring device and method used in a portable blood purification system. 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] Generally, there are three commonly used detection methods: (1) capacitive detector; (2) infrared photoelectric detector; (3) ultrasonic detector. Since the ultrasonic detector has the characteristics of strong...

Claims

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Application Information

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IPC IPC(8): A61M1/36
CPCA61M1/3626A61M2205/18
Inventor 李平
Owner BEIJING MEDER MEDICAL SCI & TECH
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