The most common type of indwelling urine drainage system is the Foley catheter. The modern Foley catheter has two lumen tubes, one for urinary drainage and the other for balloon inflation. You can inflate the balloon with air or sterile water. It is inflated after catheterization to assist in keeping the catheter in place. Silicone rubber or Latex are commonly used in Foley catheters. Latex is prone to overgrowth and has been linked to urethral irritation.
The French scale is used to size Foley catheters based on outer diameter. 0.33 mm = one French (Fr). The size ranges from 12 Fr (4 mm) to 30 Fr (30 mm) (10 mm). In most adults, size 12 Fr is large enough to remove urinary blockage, though practitioners commonly use size 14 to 16 Fr for first catheterization. For appropriate hematuria or clot drainage, larger diameter catheters may be required. A drainage bag is commonly used with the catheter.
Color | Size French |
Green | 6 |
Blue | 8 |
Black | 10 |
White | 12 |
Green | 14 |
Orange | 16 |
Red | 18 |
Yellow | 20 |
Purple | 22 |
Blue | 24 |
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