Medical devices

Cannula – Use & Health Benefits


cannula is a hollow needle that serves as part of a syringe for penetrating human or animal tissue to inject or withdraw fluids. In medicine, it is used for diagnostic and therapeutic purposes. For reasons of hygiene, cannulas are now almost exclusively used once for routine procedures.

What is a cannula?

Cannulas are hollow needles through which injections or blood samples are taken. They can also be used as stylets for introducing catheters.

Cannulas play an indispensable role in medicine. There are hollow needles through which injections or blood samples are taken. They can also be used as stylets for introducing catheters .

Depending on the intended use, the length, outer diameter and cut of the cannulas vary. There is usually a sloping cut at the end of the cannula. As a result, it makes a small incision when penetrating the tissue. This incision means that the puncture (sticking into the tissue) is not as painful.

When injecting into existing body orifices or cavities, blunt cannulas are used. The tissue is not damaged in the process. These cannulas are ground blunt and cut vertically.

Button cannulas still have a bead-shaped, thickened head. They are mainly used in dentistry .

Shapes, Species & Types

Cannulas can be classified according to indication, properties or use. Depending on the purpose for which they are indicated, there are biopsy cannulas, tracheal cannulas, injection cannulas, puncture cannulas or rinsing cannulas.

The length, the diameter and the ship play a role in the properties. The size of cannulas can be specified in different dimensions. This is how the outside diameter is represented in millimeters. The representation in gauge (G) stands for the fineness of the outer diameter. The larger the gauge number, the thinner the cannula. Furthermore, the cannula can be sharpened to a point or blunt.

After use, there are disposable cannulas or multiple cannulas. For reasons of hygiene, only single-use cannulas are used in Germany for taking blood and for injections. Needles often have to be inserted into blood vessels for injection or blood collection. These require sharp grinding in order to open the tissue of the blood vessel through an incision.

For some applications, such as in dentistry, cannulas are often only used to introduce rinsing fluids or medication into an existing body opening (body cavity). In this case, no tissue needs to be opened. Cannulas with a blunt cut or with a bead-like, thickened head are used. These cannulas are also used to supply wounds with medication.

A cannula can also be used as a stylet. In this case, it serves as an aid for the insertion of catheters or tubes. When the catheter or tube is in the right place, the stylet is removed.

Structure & functionality

Cannulas are very often used to open blood vessels . Blood sampling and injections are part of the routine measures in medical applications. Here, cannulas with a sharpened, sloping cut must always be used.

This sets an incision. If this sloping cut were not available, the tissue would only be painfully displaced. In order to keep the injection as painless as possible, some cannulas are additionally coated. After piercing the tissue, the sharpness of the cut disappears again. The next application would be much more painful. The cannula is therefore disposed of immediately after it has been used once.

When taking blood or tissue, the samples are sucked in through the narrow channel of the hollow needle. In contrast, with injection, the material to be injected (blood, electrolyte solution, nutrient solution, medication, and much more) is injected into the target tissue or blood vessel. In both cases, the cannula is attached to a reservoir of the syringe, which either contains the injection solution or is filled when the blood or sample is taken.

Cannulas also serve as stylets for opening blood vessels or other tissue parts for the insertion of catheters or tubes. Biopsies by puncturing certain organs can also be carried out using cannulas. Cannulas for treating wounds with medication also have a wide range of applications.

Medical & health benefits

Cannulas are of great medical importance. They are used for diagnostic purposes when taking blood and removing tissue for biopsies. Injections take up a lot of space. For example, blood transfusions , electrolyte administration, injections of nutrient solutions, hormone replacement therapies and much more would not be possible without cannulas.

Another major area of ​​application for cannulas is the supply of medicines to wounds in medicine and dentistry. The introduction of catheters and tubes is often ensured by cannulas. In emergency medicine , many life-saving measures would not be possible without cannulas.

Proper use is of course important. So cannulas can also be the source of diseases. In the past, infectious diseases were often transmitted via syringes. The cannulas were often used several times, and their disinfection even failed in some cases. That is why the strict rules for single-use cannulas apply today.

But even at present, health impairments due to improper use of cannulas and syringes cannot be ruled out. They must always be sterilized before use. When performing infusions, care must always be taken to ensure that no air can get into the blood vessels. This is a serious emergency that can lead to an air embolism.

Overall, the medical importance of cannulas cannot be overestimated. They have been used medicinally since ancient times.

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Hello! I am Lisa Newlon, and I am a medical writer and researcher with over 10 years of experience in the healthcare industry. I have a Master’s degree in Medicine, and my deep understanding of medical terminology, practices, and procedures has made me a trusted source of information in the medical world.