Abstract : Vacuum is the power of vacuum blood collection tube to collect blood, which directly affects the amount of blood collected. In this paper, the Labthink blue light G2/130 differential gas container gas permeability tester was used to test the air permeability of the vacuum blood collection tube sample to prevent the air permeability of the blood collection tube from causing excessive changes in its internal vacuum. And introduce the test equipment, test principle, equipment parameters and other contents to provide reference for the enterprise to monitor the air permeability of vacuum blood collection tubes.
Key words: vacuum blood collection tube, vacuum degree, blood collection amount, barrier property, air permeability, pressure difference method container gas permeability tester
1. Meaning
Vacutainer tube plug generally consists of four parts, plastic caps, tubes and additives, having a clean and safe, simple and reliable when used in blood collection process has been widely used in the world. According to the different uses of the extracted blood, the type and concentration of the additives contained in the vacuum blood collection tube will be different and differentiated by the color of the blood collection cap, as shown in FIG. 1 .
Figure 1 Vacuum blood collection tube for different purposes
There are many factors affecting the quality of vacuum blood collection tubes, such as the type, performance, concentration, and vacuum stability of materials and additives for vacuum blood collection tubes. Vacuum is the driving force for blood collection by vacuum blood collection tubes, and the degree of vacuum directly affects the blood collection tube. Blood volume. The quality of venous blood collection depends on the ratio of blood to anticoagulant. For vacuum blood collection tubes, the ratio of blood to anticoagulant depends on the amount of blood collected by the blood collection tube. If the amount of blood collected is large, the proportion of blood is too high. Relatively insufficient coagulant, rapid increase in micro-coagulation in plasma, it may plug the test equipment, affecting some of the test indicators, if the blood collection is small, the relative excess anticoagulant, will also seriously affect the test. Therefore, the degree of vacuum in the vacuum blood collection tube is an important factor affecting the test results. For the degree of vacuum in the blood collection tube, in addition to the influence of the ambient air pressure, temperature, and airtightness of the vacuum tube, the blood collection tube itself is also one of the influencing factors for the air in the environment, and the higher air permeability will lead to The amount of gas infiltrated into the interior of the blood collection tube is large, which causes a decrease in the degree of vacuum of the blood collection tube. With the prolonged storage time of the blood collection tube, the poorer barrier performance of the blood collection tube will have more significant influence on the degree of vacuum. Vascular barrier monitoring is particularly necessary.
2. Test samples
A brand of plastic vacuum tube.
3. Detection basis
In the storage process, there is a pressure difference between the inner and outer side of the vacuum blood collection tube. Therefore, this article uses the differential pressure principle to test the air permeability of the vacuum blood collection tube sample. At present, there is no use of the pressure difference method to test the gas permeability of the container. Related standards.
4. Test equipment
This article uses the G2/130 Differential Pressure Vessel Gas Permeability Tester independently developed by Jinan Languang Electromechanical Technology Co., Ltd. to test the air permeability of the sample.
Figure 2 G2/130 differential pressure vessel gas permeability tester
4.1 Test principle
When the air permeability of the container is tested by the differential pressure principle, a certain pressure difference is maintained on both sides of the sample. During the test, the treated hollow container sample is clamped on the test chamber. Then, the inner and outer chambers of the container and the entire system are evacuated. After the specified degree of vacuum is reached, the vacuum is stopped, and then the outer chamber of the test specimen is evacuated. The pure air is introduced so that the set pressure difference between the inner and outer chambers is reached. Under the action of this pressure gradient, air will penetrate from the outer chamber of the sample through the sample to the inner chamber, and the pressure will be monitored according to the change of the inner chamber pressure. The air permeability performance data of the entire container sample was obtained.
4.2 Equipment Parameters
The test range is 0.0001 to 1800 mL/(pkg·day) with a vacuum resolution of 0.1 Pa . The gas permeation of 3 samples can be tested at the same time , and the average of the test results of the 3 samples is displayed . The test temperature is ambient temperature and the humidity control range is 0%RH , 2%RH ~ 98.5%RH , 100%RH . Testable test gases include air, oxygen, nitrogen, carbon dioxide, and the like. Inside and outside the container are vacuumed to ensure the accuracy and validity of the test data. The system is computer controlled and the entire test process is automated. LystemTM laboratory data sharing system is supported to uniformly manage test results and test reports. The patented testing method and structural design of the invention effectively solve various problems in the differential pressure container testing.4.3 Scope of application
This equipment is suitable for testing the overall gas transmission capacity of various hollow packaging containers, such as carbonated beverage bottles, Guozhen beverage bottles, edible oil drums, tea beverage bottles, dairy product packaging containers, washing and chemical product packaging containers, and metal packaging containers.
5. Test process
(1) Seal the vacuum blood collection tube to be tested on the sample clamping structure of the device with a fast-fixing glue, and fix the sealing cover.
Figure 3 sample clamping
(2) Set the sample name, sample parameters, and other related information.
(3) Click on the test option to turn on the vacuum pump and start the test.
(4) After the test is completed, the equipment automatically displays the test results.
6. Test results
The air permeability of the vacuum blood sampling sample for this test was 0.0061 mL/(pkg·day) .
7. Conclusion
The air permeability is an important factor affecting the blood collection volume of vacuum blood collection tubes, which directly affects the accuracy of the test results. Therefore, the monitoring of its barrier properties should be strengthened. G2/130 differential pressure container gas permeability tester has the advantages of accurate test results, good reproducibility, simple operation, etc. in the gas permeability of the test container, and there are many types of gases that can be tested. It is an accurate test. Container test specimen barrier performance testing equipment. Labthink is a high-tech enterprise specializing in R&D, production and service of packaging testing equipment. It is always committed to providing high-end, precise packaging testing equipment and caring, high-quality packaging testing services to customers around the world. The relevant testing equipment has been covered. Packaging performance, smoothness, flexibility, sealing performance, resistance to puncture, solvent residue, evaporation residue and other full-featured testing, related equipment and services you can visit the website of Jinan Languang company to view or call Jinan Languang advisory. The more you understand, the more trust! Labthink expects to enhance technology exchanges and cooperation with enterprises and institutions in the industry!
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