Instant vacuum venous blood-sampling method and special equipment

Abstract

The invention discloses an instant vacuum venous blood-sampling method and special equipment. A closed negative-pressure blood-sampling system is formed by a miniature variable-speed peristaltic pump, a miniature electromagnetic valve, a bidirectional blood-sampling needle, a test tube with a special test tube plug and a closed test tube rack. The instant vacuum venous blood-sampling method comprises the following steps of: inserting the test tube with a plug into the test tube rack and tightly pressing the tube plug; then, puncturing a plug-puncturing needle of the bidirectional blood-sampling needle into the test tube plug, puncturing the other end into vein, starting a peristaltic pump and forming a vacuum environment between the interior of the test tube rack and the test tube; forming a negative pressure in the test tube through an air hole of the test tube plug and pumping blood into the test tube; and adding auxiliary blood-sampling equipment so as to conveniently sample blood. The invention solves various problems existing in a vacuum blood-sampling system, has the advantages of simpleness, convenience, practicability, economy and high efficiency and is suitable for popularization and use in various big hospitals and primary healthcare departments.

Description

technical field [0001] The invention relates to a medical device, in particular to a venous blood collection device for blood testing in a hospital. [0002] As a fully enclosed blood collection device, the vacuum blood collection system can greatly improve the quality of blood samples and promote the quality control of laboratories before analysis. At the same time, it can better protect the safety of medical personnel such as blood collectors and inspectors than traditional syringe blood collection, and avoid blood-borne cross-infection. Today, the vacuum blood collection system is the mainstream of the blood sample collection system in the world. In recent years, the introduction and development of the vacuum blood collection system has been carried out in our country. The two health industry standards "WS / T 224-2002 Vacuum Blood Collection Tubes and Their Additives" and "WS / T 224-2002 Vacuum Blood Collection Tubes and Their Additives" stipulate that disposable vacuum bloo...

AI Technical Summary

Problems solved by technology

However, it is not a perfect technology, there are still many inherent deficiencies in the technology and some problems in operation need to be solved

The specific problems are as follows: (1) Hemolysis phenomenon Due to the large negative pressure in the vacuum tube, the blood flows into the bottom of the tube at a fast speed at the beginning of blood collection, and the collision of red blood cells may cause rupture and increase in foam, which may easily cause hemolysis

(2) Existence of residual negative pressure Since ordinary vacuum tubes are widely used, the set negative pressure is relatively large. If the difference between the collected specimen volume and the set pressure in the test tube is large, there will still be a large residual in the previous test tube when changing the tube. Negative pressure, causing the gas dissolved in the blood to overflow, causing red blood cells to swell and rupture, causing hemolysis

(3) Blood pollution caused by blood leakage. The latex sheath at the blood collection tube end of the two-way blood collection needle is loose or the needle pierces the latex sheath, resulting in a poor seal of the two-way blood collection needle.

(4) It is impossible to judge whether the puncture is successful. It is difficult to judge whether the puncture is successful when there is no blood return when the bidirectional needle is punctured. The success of the puncture can only be judged by the operator's feeling, experience or blood inflow after connecting the vacuum tube.

However, the presence or absence of a vacuum cannot be identified with the naked eye, and it is impossible to detect the vacuum state in the tube to eliminate the waste tube before clinical application. Therefore, there are cases where the puncture is successful but no bleeding or insufficient blood volume is obtained after the puncture is inserted into the blood collection tube.

(6) The amount of blood collected cannot be controlled independently. Too many or too few blood samples will cause blood coagulation in the anticoagulant tube and blood non-coagulation in the procoagulant tube.

A small number of blood collection tubes inevitably have quality problems, resulting in insufficient or high negative pressure in the blood collection tubes

(7) Test tube manufacturing costs are high In order to maintain negative pressure for a long time, good quality rubber stoppers and test tubes must be used, and test tubes made of soft materials cannot be used, resulting in increased manufacturing costs

It retains the advantages of the vacuum blood collection device and overcomes its shortcomings, but there are still problems to be solved after the implementation: 1. Manual multi-tube replacement operation is inconvenient and cumbersome

2. The soft test tube cannot be extracted, and the tube wall will collapse during suction

3. The machine is noisy and cannot adjust the speed

4. Without auxiliary blood collection equipment, it is still inconvenient to use

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