The blood collection needle is an instrument for collecting blood samples during medical examination. It consists of a needle and a needle bar. The needle is placed on the head of the needle bar. The needle is slidably connected to the needle bar. The sheath and the needle bar are There is a return spring between them and the initial position of the sheath is at the head of the needle and the needle bar.
1.Split type
The split blood collection needle is a commonly
used disposable blood collection needle, which basically replaces the blood
collection method of the syringe used in the last century, and is often used in
combination with the disposable blood collection tube.
The structure is
connected to a blood collection needle at the end of the hose end of the
intravenous infusion needle. When using, the blood collection needle needs to be
rotated and fixed at the front end of the needle holder outer tube, and the hand
vein puncturing is performed for the vein. After successful, the vacuum blood
collection tube is inserted into the rear end cavity of the needle holder, so
that the blood collection needle edge passes through. The blood-slip sleeve is
inserted into the vacuum tube rubber plug, and the blood is sucked into the
blood collection tube under the action of negative pressure. When necessary,
such repeated, multi-tube blood collection can be achieved; blood collection is
completed, the venous puncture needle is pulled out, local hemostasis is
removed, the blood collection needle is removed from the needle holder, and the
venous puncture needle is discarded in the waste box.
Features: After the blood collection needle is fired, the needle core will be locked, so that the blood collection needle can only be used once, which can ensure the safety of the user; the push-type emission design provides the user with the easiest operation; high quality and super sharp The triangular needle design can quickly pierce the skin and reduce the pain of the patient; the needle type and piercing depth of various specifications are suitable for most blood collection needs.
2. Pen type lancet
Pen-type lancets are not used much in clinical
practice. The structure is a penetrating needle, and both ends have a sharp
cutting edge. The lower part of the needle tube is fixed on the needle seat, the
front end is called a venipuncture needle, the back end is called a blood
collecting needle, and the blood collecting needle surface has a blood blocking
sleeve and a needle tube. There is a protective sleeve at the end. Clinically,
blood collection is usually used in conjunction with needle holders and
disposable blood collection tubes.
When in use, the blood collection needle is rotated and fixed at the front end of the outer tube of the needle holder, and the venipuncture is performed. After successful, the vacuum blood collection tube is inserted into the cavity of the rear end of the needle holder, so that the back end of the blood collection needle passes through the blood blocking sleeve and runs through. Puncture the vacuum tube rubber plug, and draw the blood into the blood collection tube under the action of negative pressure. Repeatedly, multiple blood collections can be collected.
3. Arterial blood collection needle
Arterial blood collection is of
great significance for the judgment and treatment of hypoxemia. Arterial blood
sampling is the basis for accurate diagnosis of hypoxemia.
Features: The arterial blood gas syringe strictly fixes the needle to prevent the risk caused by the needle loosening during the whole process of collecting the arterial blood sample. The molecular density of the blood collection needle wall height and the double closed needle plug effectively prevent gas exchange between the blood gas sample and the outside. Before the blood collection, the blood collection amount can be preset according to the test, so that the arterial puncture operation is safe and simple, and the blood sample is avoided. The rear end of the syringe is designed to form a unique automatic exhaust device, which can automatically and automatically discharge the residual gas inside the syringe under the action of arterial pressure, so as to avoid the interference of the dead space gas on the arterial blood gas detection result.
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Medical Mold - How To Use Different Blood Collection Needles
原文：https://www.cnblogs.com/kristamedicalmould/p/11697565.html