What are the classification and usage of lancet?

1. The split blood sampling needle is a disposable blood sampling needle commonly used clinically, which basically replaces the syringe blood sampling method used in the last century, and is often used in conjunction with a disposable blood sampling tube. 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, the venipuncture needle is pulled out to stop bleeding locally, the blood collection needle is removed from the needle holder, and the venipuncture needle is discarded in the waste box. Features: After the lancet is launched, the needle core will be locked, so that the lancet can only be used once, which can ensure the safety of the user; the design of the push-type launcher provides the user with the easiest operation; high-quality, ultra-sharp The three-sided needle design can quickly pierce the skin and reduce the pain of the patient; the various needle types and piercing depths are suitable for most blood collection needs.

2. Pen-type blood sampling needles are not widely used in clinical practice. The 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 successful, 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 stop 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.

3. Arterial blood sampling needle Arterial blood sampling is of great significance for judging and treating hypoxemia. Arterial blood sampling is the basis for accurately judging hypoxemia.

Features: The arterial blood gas syringe strictly fixes the needle to prevent the risk of loosening the needle during the whole process of collecting the arterial blood sample. The high molecular density of the blood sampling syringe wall and the double closed needle plug effectively prevent the blood gas sample from gas exchange with the outside world. Before blood sampling, the amount of blood collected can be preset according to the needs of the test, so that the arterial puncture operation is safe and simple, and the waste of blood samples is avoided. The hole stone at the back of the syringe is designed to form a unique automatic exhaust device, which can quickly and safely discharge the residual gas in the syringe under the action of arterial pressure, and avoid the interference of dead space gas on the arterial blood gas detection results.

The steps of using arterial blood sampling needle:

1. Take the arterial lancet out of the sterile packaging.

2. Remove the cap of the arterial blood sampling needle and put it in a proper place.

3. Flip the needle cap outward.

4. Push the mandrel forward to the zero scale line and withdraw the preset to the desired scale.

5. With the arterial blood sampling needle down, puncture at an angle of 45° to 90°.

6. Fill the sample to the preset scale under arterial pressure.

7. After the sample is collected, immediately pull out the arterial lancet needle and press the puncture point with gauze for at least 5 minutes to prevent bleeding.

Precautions for use:

1. Do not use the protective cap if it is loose or detached.

2. For personal safety, please do not reuse the lancet.

3. Do not share the same lancet with others to prevent cross-infection.

4. The problem of lancet fixation: the little finger presses the connecting tube or the tape sticks to one-third of the connecting tube. If possible, the lancet tip should enter the blood vessel as much as possible.

5. Bullet tube problem: In order to prevent the tube from collapsing, hold the blood collection tube in one hand and the end of the blood collection needle in the other hand.

6. Bleeding problems: Use cotton swabs or post-needle stickers to gently press the puncture point to prevent bleeding.

7. Occasionally, the blood flow rate is very slow during use. It may be due to insufficient negative pressure of the vacuum blood collection tube, thick blood of the patient, low blood pressure, and the blood collection needle hole is blocked by the blood vessel wall.

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