- Size (18 Fr): “Fr” stands for French gauge (or French size), a scale used to measure the diameter of catheters. Each French unit equals 0.33 mm, meaning an 18 Fr catheter has a diameter of approximately 6 mm. The 18 Fr catheter is often color-coded red on the inflation port for easy size identification.
- Structure: It is a flexible tube, typically made of silicone or coated latex, designed to be inserted through the urethra into the bladder. It features at least two separate internal channels (lumens):
Uses
A size 18 Fr Foley catheter is typically selected for adults when a slightly larger lumen is needed for efficient drainage or when there is a risk of blockage. Common uses include:
- Urinary Retention/Incontinence: To provide relief for patients unable to empty their bladder due to conditions like an enlarged prostate (BPH) or nerve-related bladder dysfunction.
- Post-Operative Care: For draining the bladder during and after surgery, especially prostate or genital surgeries, to allow the bladder to heal and to monitor urine output.





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