A Foley catheter is a flexible tube that a clinician passes through the urethra and into the bladder to drain urine.
Material: Typically made of latex or silicone.
Balloon: A small inflatable balloon at the tip that holds the catheter in place within the bladder.
Uses: Used for patients with urinary retention, during surgery, for accurate urine output measurement, and in certain medical conditions.
Types of foley catheters:
1. Two-way foley catheter: Standard type with one channel for urine drainage and another for inflating the balloon.
2. Three-way foley catheter: Has an additional channel for bladder irrigation, commonly used in patients with hematuria or after bladder surgery.
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Devices that are inserted through natural opening |
Devices that are inserted through unnatural opening |
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Number increase, diameter increase |
Number increase, diameter decrease |
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Diameter order- 12G < 14G < 16G < 18G |
Diameter order- 12G > 14G > 16G > 18G |
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1. Ryles tube- in nose / mouth 2. Suction catheter- in nose / mouth 3. Gudel airway- in mouth 4. Foley catheter- in uretha |
1. IV cannula - in veins |
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French Size (Fr) |
Foley Catheter Color |
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10 Fr |
Black |
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12 Fr |
White |
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14 Fr |
Green |
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16 Fr |
Orange |
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18 Fr |
Red |
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20 Fr |
Yellow |
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22 Fr |
Purple |
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24 Fr |
Blue |