• Natural openings- Mouth, Nose, Urethra
• Unnatural openings- created during procedures such as intravenous (IV) cannula insertion & lumbar puncture.
|
Devices that are inserted |
Devices that are inserted |
|
Number increase, diameter increase |
Number increase, diameter decrease |
|
Diameter order- 12G < 14G < 16G < 18G |
Diameter order- 12G > 14G > 16G > 18G |
|
• Ryles tube: in nose / mouth • Suction catheter: in nose / mouth • Gudel airway: in mouth • Foley catheter: in uretha |
• IV cannula: in veins • Spinal needle (for lumbar |
|
Color |
Gauge Size |
Outer Diameter (mm) |
Flow Rate (ml/min) |
|
Orange |
14 G |
2.1 |
270 |
|
Grey |
16 G |
1.8 |
180 |
|
White |
17 G |
1.5 |
133 |
|
Green |
18 G |
1.3 |
90 |
|
Pink |
20 G |
1.1 |
60 |
|
Blue |
22 G |
0.9 |
36 |
|
Yellow |
24 G |
0.7 |
20 |
|
Purple |
26 G |
0.6 |
13 |
