The Classification And Use Of Lancets

A blood sampling needle is an instrument used to collect blood samples in the medical examination process. It consists of a needle and a needle shaft. The needle is set on the head of the needle shaft. A sheath is slidably connected to the needle shaft. A return spring is arranged in between, and the initial position of the sheath is located at the head of the needle and the needle shaft.

1. Split type

Split blood collection needles are disposable blood collection needles commonly used clinically, which basically replace the syringe blood collection method used in the last century, and are often used in conjunction with disposable blood collection tubes. The structure is that a blood collection needle is connected to the needle seat at the end of the tube of the intravenous infusion needle. When in use, the blood collection needle needs to be rotated and fixed on the front end of the needle holder outer cylinder, and the vein puncture is carried out with the hand held to puncture the vein. After successful, the vacuum blood collection tube is inserted into the back cavity of the needle holder, so that the blood collection needle blade passes through The blood stopper is pierced into the rubber stopper of the vacuum tube, and the blood is sucked into the blood collection tube under the action of negative pressure. If necessary, repeat this process to achieve multi-tube blood collection; after blood collection, pull out the venipuncture needle to stop bleeding locally, remove the blood collection needle from the needle holder, and discard the venipuncture needle in the waste box

2. Pen-type blood sampling needle

Pen-type blood sampling needles are not used much in clinical practice. Its structure is a penetrating needle tube with sharp cutting edges at both ends. The middle and lower section of the needle tube is fixed on the needle seat. The front end is called a venipuncture needle, and the back end is called a blood collection needle. The blood collection needle has a blood blocking sleeve and a needle tube on the surface There is a protective sleeve at the end. In clinical practice, 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 to the front end of the outer cylinder of the needle holder to perform venipuncture. After success, insert the vacuum blood collection tube into the cavity at the rear end of the needle holder, so that the rear edge of the blood collection needle passes through the blood blocking sleeve and penetrates The rubber plug of the vacuum tube is pierced, and the blood is drawn into the blood collection tube under the action of negative pressure. Such repetition can realize the collection of multiple blood samples.