Parts of Cannula - 3 Way Cannula

Intravenous Cannula - IV Cannula



The cannula is a small tube inserted into the body, used for the delivery of liquid or removal of fluid or for the collecting of samples. For example; a blood sample.



Check out here what different types of cannula are and sizes their uses.



A cannula is a hollow tube, retractable (able to be drawn back) which has a sharp inner core, that is inserted into a vein, an artery, or another body cavity.


Intravenous (IV) cannulation or venous cannula or IV cannula are inserted into a vein, primarily administration of intravenous fluids, drugs, or obtaining blood samples.



Healthcare providers must have knowledge about What types of IV fluids are given and how to deliver fluid directly to the vein.




Parts of Cannula


The parts of IV Cannula is- 

Parts of Cannula

1.      Flashback Chamber


2.      Needle Grip


3.      Luer Lock Plug


4.      Luer Connector


5.      Valve


6.      Injection Port Cap


7.      Catheter Hub + Wings


8.      Bushing


9.      Catheter


10.    Needle

3 Way IV Cannula – 3 Way Stopcock



The IV cannula is integrated with a 3-way stop cock that facilitates simultaneous infusion of fluids or additional medication.


It provides 3-way fluid flow by use of top of the stopcock to open and close lines.



1. From inlet to outlet


2. Inlet to side-port


3. Side port to an outlet



For example, a 3-way cannula stopcock has three positions-


1. Liquid flows between points A and B.

2. Liquid flows between points A and C.

3. Liquid flows between points B and C.



Know here what are different types of iv catheters and their sizes and uses.




4 Way Cannula - 4 Way Stopcock




A 4-way cannula stopcock allows for 360° of rotation and has four available positions.

1. In the first, liquid flows between points A and B.

2. In the second, liquid flows between points A and C.

3. In the third, liquid flows between points B and C.

4. In the fourth (in 4-way stopcock only), liquid flows between all three points.





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