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Catheter – Definition, Types and Uses

A catheter is a thin, flexible tube inserted into body cavities or blood vessels to drain or deliver fluids. It is used in medicine for both diagnostic and therapeutic purposes.

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Things worth knowing about "Catheter"

A catheter is a thin, flexible tube inserted into body cavities or blood vessels to drain or deliver fluids. It is used in medicine for both diagnostic and therapeutic purposes.

What Is a Catheter?

A catheter is a thin, flexible tube made of plastic, latex, or silicone that is inserted into body cavities, blood vessels, or hollow organs. It is used to drain fluids, deliver medications, or assist with diagnostic procedures. Catheters are used across nearly all medical specialties and represent a fundamental tool in modern medicine.

Types of Catheters

Catheters are classified by their intended use and insertion site:

Urinary catheter (bladder catheter): Inserted through the urethra or abdominal wall into the bladder to drain urine. This is the most common type of catheter in clinical practice.
Central venous catheter (CVC): Inserted into a large vein (such as the subclavian vein or internal jugular vein) to administer medications, IV fluids, or nutritional solutions directly into the bloodstream.
Peripheral venous catheter: The most basic form of venous access, typically placed in a vein in the arm.
Arterial catheter: Inserted into an artery for continuous blood pressure monitoring or blood sampling.
Cardiac catheter: A specialized catheter advanced through blood vessels to the heart to diagnose or treat heart conditions (e.g., coronary angiography, balloon dilation).
Epidural catheter: Inserted into the epidural space of the spine to deliver pain medication close to the spinal cord, commonly used in childbirth or post-operative pain management.
Peritoneal dialysis catheter: Placed into the abdominal cavity to enable peritoneal dialysis in patients with kidney failure.

Applications

Catheters serve a wide range of medical purposes:

Draining urine in cases of urinary retention or during surgery
Administering medications, fluids, or blood products
Diagnostic procedures (e.g., cardiac catheterization, contrast dye injection)
Measuring body pressures (e.g., blood pressure, intracranial pressure)
Collecting body fluids and blood samples
Pain management (e.g., epidural catheter)
Parenteral nutrition delivery

Insertion and Care

Inserting a catheter is always performed under sterile conditions to minimize the risk of infection. For a transurethral bladder catheter, the tube is guided through the urethra into the bladder and secured in place with a small balloon (Foley catheter). Alternatively, a catheter may be inserted directly through the abdominal wall into the bladder (suprapubic catheter).

Regular care and monitoring of an indwelling catheter are essential to prevent complications such as infections, blockages, or tissue damage. Healthcare professionals and patients should watch for signs of infection (redness, pain, fever, cloudy urine) and report them promptly.

Risks and Complications

Although catheters are indispensable medical devices, they can carry certain risks:

Catheter-associated urinary tract infections (CAUTI): The most common complication of bladder catheters. Bacteria can travel along the catheter into the bladder.
Thrombosis and embolism: Blood clot formation is a risk especially with venous catheters.
Pneumothorax: When placing a central venous catheter in the chest area, there is a risk of accidental puncture of the lung.
Sepsis: In severe cases, bacteria can enter the bloodstream via the catheter and cause a life-threatening infection.
Injury and bleeding: Surrounding structures may be damaged during insertion or removal.

When Is a Catheter Necessary?

A catheter is used when a medical condition or procedure requires it. Common indications include:

Urinary retention (acute or chronic)
Controlled fluid management in intensive care units
Major surgical procedures
Diagnostic cardiac catheterization
Pain management during surgery or for chronic conditions
Renal replacement therapy (dialysis)

The treating physician always determines which type of catheter is most appropriate for each individual situation. The duration of catheter use should be kept as short as medically justifiable to reduce the risk of complications.

References

European Association of Urology (EAU) - Guidelines on Urological Infections. 2023. Available at: https://uroweb.org
Centers for Disease Control and Prevention (CDC) - Guidelines for Prevention of Catheter-Associated Urinary Tract Infections. 2009. Available at: https://www.cdc.gov
Kuipers, S. et al. - Central Venous Catheter Care and Complications. New England Journal of Medicine, 2023.

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