What Is a Foley Catheter and How It Differs From Other Types

A Foley catheter is a flexible tube that medical professionals place into the bladder to drain urine. It’s named after Dr. Frederic Foley, who developed the design in the 1930s. This device is one of the most common types of indwelling urinary catheters, meaning it stays in place for a period of time rather than being inserted and removed immediately.

Understanding what a Foley catheter is—and how it differs from other catheter types—can help you feel more informed if you or a loved one ever needs one. Below, we cover its design, uses, benefits, risks, and a comparison with other catheters.

---

Key Features of a Foley Catheter

• Indwelling design
  A Foley catheter remains in the bladder until it is no longer needed. A small balloon inflated with sterile water anchors it in place.

• Two or three lumens (channels)

  • One lumen drains urine into a collection bag.
  • One lumen inflates and deflates the balloon.
  • A third lumen, present in some models, allows irrigation (flushing the bladder).

• Materials and sizes

  • Common materials: silicone, latex, or a combination.
  • Sizes measured in French units (Fr), typically ranging from 10 Fr to 24 Fr for adults.
  • Balloon capacity usually 5–30 mL of sterile water.

• Collection system
  Urine drains continuously into a bag that can be anchored to a bed or leg, allowing mobility.

---

Common Reasons for Foley Catheter Use

1. Urinary retention
   Inability to fully empty the bladder due to blockages (e.g., enlarged prostate), nerve issues, or post-surgery swelling.
2. Accurate urine output monitoring
   Critical in intensive care, major surgery recovery, or for severe dehydration.
3. Perioperative management
   During and after urologic or certain abdominal surgeries.
4. Immobilized patients
   Those unable to use a toilet (e.g., spinal cord injuries, severe fractures).
5. Skin care
   Managing severe incontinence when skin breakdown is a concern.

---

How a Foley Catheter Works

1. Insertion
   • Performed under sterile conditions by a trained professional.
   • The catheter is lubricated and gently passed through the urethra into the bladder.
2. Balloon inflation
   • Sterile water injected into the inflation lumen expands the balloon inside the bladder.
   • The balloon holds the catheter in place.
3. Urine drainage
   • Gravity or a closed drainage system directs urine through the main lumen into a bag.
4. Maintenance
   • Regular cleaning of the catheter’s external portion and changing the collection bag per protocol.

---

Foley Catheter vs. Other Urinary Catheter Types

1. Intermittent (Straight) Catheter

• Design: Single-lumen tube without a balloon.
• Use: Inserted to drain the bladder then removed immediately.
• Pros:
  • Lower risk of infection than indwelling catheters when performed correctly.
  • No balloon irritation.
• Cons:
  • Requires multiple daily catheterizations.
  • Less convenient for patients with limited hand function or mobility.

2. External (Condom) Catheter

• Design: A sheath (like a condom) placed over the penis, attached to a drainage tube.
• Use: For men with urinary incontinence who don’t retain urine.
• Pros:
  • Non-invasive, no internal device.
  • Lower urethral trauma risk.
• Cons:
  • Can slip or leak.
  • Not suitable for women.
  • Air and moisture under the sheath can irritate skin.

3. Suprapubic Catheter

• Design: Inserted directly into the bladder through a small incision in the lower abdomen.
• Use: Long-term drainage when urethral access is problematic.
• Pros:
  • Reduced urethral trauma.
  • Easier sexual activity.
• Cons:
  • Requires a minor surgical procedure.
  • Risk of abdominal infection.
  • Scarring at insertion site.

4. Indwelling Urethral (Foley) Catheter

• Design: Balloon-tipped tube inside the bladder; remains in place.
• Use: Medium- to long-term drainage (days to weeks).
• Pros:
  • Reliable, continuous urine drainage.
  • Relatively straightforward insertion and removal.
• Cons:
  • Higher urinary tract infection (UTI) risk if not properly maintained.
  • Urethral irritation or injury over time.

---

Potential Risks and Complications

While Foley catheters serve important medical purposes, they carry possible downsides:

• Urinary Tract Infections (UTIs)
  Bacteria can travel along the catheter into the bladder.
• Blockages
  Blood clots, sediment, or kinks may obstruct urine flow.
• Urethral Injury
  Overinflation of the balloon or improper insertion can cause trauma.
• Bladder Spasms
  Irritation from the catheter balloon may trigger discomfort or spasms.
• Allergic Reactions
  Rare latex sensitivity in some patients.

To lower risks:

• Maintain strict hygiene—clean around the catheter daily with mild soap and water.
• Ensure the drainage bag stays below bladder level to prevent backflow.
• Replace the catheter per medical guidelines (usually every 2–4 weeks for long-term use).
• Watch for signs of infection: fever, burning sensation, cloudy or foul-smelling urine, or lower abdominal pain.

---

Insertion and Removal Overview

Insertion

• Patient in a comfortable position (supine with knees bent or side-lying).
• Sterile gloves, drapes, and equipment used.
• Lubricate catheter; gently advance until urine flows.
• Inflate balloon with sterile water once in the bladder.

Removal

• Deflate the balloon completely by withdrawing water.
• Gently pull the catheter out.
• Monitor for normal urination and any discomfort.

Both procedures should be performed by or under the guidance of a healthcare professional.

---

When to Seek Medical Attention

Always consult a doctor if you experience:

• Fever or chills alongside catheter use.
• Severe lower abdominal, pelvic, or back pain.
• Inability to drain urine (no urine output for several hours).
• Blood in the urine that doesn’t improve.
• Signs of catheter damage or dislodgment.

If you’re unsure about your symptoms, consider doing a free, online symptom check, using the doctor approved Ubie Symptom Checker. This tool can help you decide whether to seek urgent care or speak with your provider.

---

Final Thoughts

A Foley catheter is a versatile, indwelling urinary device designed for continuous bladder drainage. It differs from intermittent, external, and suprapubic catheters by its balloon-anchored design and medium- to long-term use. While Foley catheters can improve patient comfort and enable accurate monitoring, they come with risks such as infection and urethral injury.

If you or a loved one faces catheter placement, stay proactive about hygiene, follow care instructions, and watch for warning signs. Always speak to a doctor about anything that could be life threatening or serious. Proper understanding and management can help ensure the safest and most effective outcome.