Urinary Catheters Explained

Catheters Commonly Used After Surgery

Urinary catheter bag

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A catheter is a general term for a tube that is inserted into the body. A urinary catheter is a tube that is inserted into the bladder to drain urine. Multiple types of urinary catheters are used for a variety of conditions, and the right catheter for one person is not necessarily right for another person. A patient's condition that makes the catheter necessary often guides the decision of what type of catheter is necessary.

Types

  • Straight catheter: This is a rubberlike tube inserted into the urethra and through to the bladder. It is removed when the bladder has drained completely. A straight catheter does not remain in place for an extended period: It is intended to be used only once. However, for some patients who must use this type intermittently throughout the day at home, a catheter may be sterilized and reused.
  • Suprapubic catheter: This type of catheter is not inserted into the urethra. Instead, it is placed through a low abdominal incision directly into the bladder. A suprapubic catheter is typically used after certain types of surgery (such as prostate surgery) that disrupt the normal flow of urine. It often remains in place for days to weeks, or it may be used permanently.
  • Condom catheter: This type of catheter, used only with males, is not inserted into the urethra; rather, it is placed on the penis much like a condom would be. It is worn through the day and collects urine in an attached bag during episodes of incontinence.
  • Foley Catheter: A Foley catheter, also known as an indwelling catheter, remains in place for an extended period. The catheter is attached to a collection bag where urine drains and is emptied periodically. The tip of a Foley catheter is inserted into the urethra and through to the bladder, where it is kept in place with a small inflated balloon.
  • Coudé catheter: This is another type of indwelling catheter, like the Foley. The difference between them is that the tip of the Coudé catheter has a slight curve, which helps thread the catheter through the urethra when a patient has an obstruction, such as with an enlarged prostate.

Purpose of a Urinary Catheter

A urinary catheter is used when the patient is unable to control their bladder because of illness, incontinence, a condition that makes urination difficult (such as a spinal cord injury), or unconsciousness.

For example, a catheter is often placed at the beginning of certain surgeries because the patient will not be conscious for the procedure. Without the catheter, the patient might urinate during the procedure and potentially contaminate the sterile field, or their bladder may become distended with urine during a long procedure.

To prevent infections, catheters are used only when necessary. In hospitalized patients, intensive care patients typically have a catheter in place for longer than a day. For other patients who have one in place, the catheter is removed as soon as they are conscious or well enough to urinate independently.

Urinary retention is an issue where the bladder fails to empty completely. Depending on the severity of the issue, a temporary catheter, called a straight catheter, may be used to drain the bladder.

Risks of a Urinary Catheter

The primary risk of short-term catheterization is a urinary tract infection. In addition, the urethra (the tube that carries urine out of the bladder) can become irritated. The skin surrounding the insertion site might also be injured and should be inspected regularly for signs of breakdown.

In rare cases, a urinary tract infection can lead to urosepsis, a systemic infection that can be very serious.

Placement of a Urinary Catheter

A catheter is placed using a sterile technique and sterile lubricant to prevent infection. Most catheters are inserted into the urethra, then gently threaded through the urethra into the bladder.

Removal of a Urinary Catheter

A catheter is typically very easy to remove. If there is a balloon at the tip of the catheter, the balloon is deflated, then the catheter is gently pulled to remove it from the body. The process is typically painless unless there is irritation present in the urinary tract. If the process is painful, a topical medication can be used to numb the area.

Urinary Catheter Care at Home

If you are caring for an indwelling catheter at home, catheter care can be performed in the shower or bath. After gently cleaning your genital area as you normally would, the catheter tube can be gently cleaned with a washcloth and mild soap. Take care not to tug or pull on the catheter, or try to push the catheter further into the body, as this can cause irritation. Be sure to rinse the soap off completely.

A catheter and the attached drainage bag should only be touched after washing your hands with soap and water, this can help prevent infection.

A Word From Verywell

Urinary catheters are common in the hospital setting, but recent research and guidelines encourage hospital staff to remove catheters as quickly as is reasonably possible. This is done to prevent urinary tract infections and to decrease the risk of side effects such as difficulty urinating. 

Urinary catheters are rarely allowed to stay in place for convenience like they once were, and are typically only allowed when necessary for the patient's health.

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Article Sources
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