An IV involves both a needle and plastic. Here's the breakdown:
How IVs Work
When starting an IV, a needle is used to guide a small plastic tube, called a cannula, into a vein. The reference states, "There is a needle inside the tube that helps guide it into the vein." The needle allows the cannula to pierce the skin and enter the vein.
Role of the Needle
- The needle's primary function is to create the initial access point into the vein.
- It is then removed, leaving the soft, flexible plastic cannula in place.
Role of the Plastic Cannula
- The plastic cannula remains inside the vein.
- This allows for fluids or medication to be administered directly into the bloodstream.
In summary
| Component | Role | Remains in Vein? |
|---|---|---|
| Needle | Guides the cannula into the vein. | No |
| Cannula | Delivers fluids/medication into the bloodstream. | Yes |
