Urinary catheter is a hollow and partially flexible tube which is used to empty the urinary bladder and collect urine in a drainage bag. This procedure known as Urinary Catheterisation. It is made up of different materials like rubber, plastic (PVC) and silicone. It is inserted either by a doctor or nurse. There are two methods by which urinary catheter is inserted in body It is inserted either through the tube that carries out of the bladder. It is known as Urethral catheter. Other method is through a small opening made above pubic region.
Why Urinary Catheterisation is used?
Catheters are used to empty bladder. If bladder is not empty properly urine build up and lead to pressure in the kidneys. If pressure is built for long time it cause kidney failure. It later on cause permanent damage to the kidneys.
Urinary catheters are used:
There are two purposes for which catheters are used-
When people have difficulty in urination naturally.
It is used to empty bladder before or after surgery and to it helps to perform certain tests.
Conditions for which Urinary Catheterisation is necessary
- After pelvic surgery.
- Blood clots in the urine.
- Dementia (Loss of memory).
- For severely impaired and terminally ill patient.
- If patient has weakness either in urinary bladder itself or in nerve. This will affect a person’s ability of pass urine.
- It is given at the time of child birth when there is need to empty bladder. Patient is not able to pass urine because of epidural anaesthetic.
- It is given in case of surgery.
- It is given when doctor want of deliver medicines directly to bladder in conditions like chemotherapy for bladder cancer.
- It is said to be last available option in untreatable case of urinary incontinence.
- It is used in conditions where there is obstruction and free flow of urine is restricted. E.g.- Prostate enlargement.
- Kidney stones.
- Medicines which impair the ability of bladder muscles to squeeze. It causes urine to remain stuck in bladder.
- Severe large of prostate gland.
- Spina bifida.
- Spinal cord injury.
- Surgery in the genital area as seen in hip fracture repair.
- To monitor urinary output of critically ill patient and it is used after surgery.
- To take sterile urine sampling for culture.
Types of Urinary Catheter
Two main varieties are used are given below:
They are temporary type. They are removed once the bladder is empty.
Indwelling catheters (Other names- Urethral catheter, Suprapubic catheter, Foley catheter)
These remain in place for many days or weeks. They are held in their appropriate place by means of inflated balloon. These are more convenient and avoid repeated insertions. But indwelling catheters are more likely to cause infections.
This type of catheter resides in the bladder. It is inserted through urethra. When it is inserted by making a hole in abdomen it is known as supra pubic catheter.
It is attached to tiny balloon present at the end of catheter. This prevents the tube from sliding out of the body.
Type of drainage in indwelling urethral catheter:
Continuously via a tube into a drainage bag- It is seen in supra pubic catheter. It is used in patient of spinal cord injury.
Intermittently via a catheter valve- It can be opened when required to allow urine to drain into a toilet, then closed to allow the bladder to refill. This avoids the need for a permanently attached drainage bag and allows the bladder to fill and empty intermittently, maintaining good bladder function. The valve must be released regularly to prevent over filling of your bladder.It is usually connected to a larger bag for drainage at night. A catheter valve is discreet and comfortable and can provide greater independence. It also reduces the possibility of trauma and infection in your bladder.
External catheters (Condom catheters)
It is placed outside the body. It is necessary for patient of serious mental disabilities like dementia. This is named so as it looks like condom which covers penis head. A tube leads from the condom device to a drainage bag.
It is more comfortable and has lower risk of infection.
Short term catheters / Intermittent catheters/In-and-out catheter.
When catheters are needed for short duration as in surgery this is used.
Indications of Urethra Catheterisation
- Accurate measurement of urinary output in critically ill patients.
- Acute and chronic urinary retention. It means urine is not passed properly either from short duration or from longer duration.
- After surgery.
- Patients having neurological disorders like paralysis or loss of sensation in body.
- Patients of urinary surgery.
- To find healing of perineal wounds in incontinent patients.
Indications for suprapubic catheterisation:
- Acute and chronic urine retention that is not able to be adequately drained with a
- Acute prostatitis.
- Complex urethral or abdominal surgery.
- Complications of long-term urethral catheterisation.
- Pelvic trauma.
- urethral catheter.
- Wheel chair user.
- When long-term catheterisation is used to manage incontinence.
Advantages of supra pubic catheterisation-
- There is less chance of urethral trauma.
- There is less chance of catheter contamination with micro-organism commonly found in the bowel.
- It is very useful for patients who are chair bound.
Disadvantages of supra pubic catheters-
- It has bleeding and visceral injury.
- Patient may still leak urine via the urethra.
- Patient of artificial heart valves may require antibiotic therapy prior to initial insertion or routine catheter change.
Contraindications of Urethra Catheterisation
- Acute prostatitis- short duration inflammation of prostate gland.
- If there is suspicion of urethral trauma.
Contraindications for supra pubic catheterisation-
- Cancer of bladder.
- If patient has localised distended urinary bladder.
- If patient has previous lower abdominal surgery.
- In patients of ascites.
- If patient has coagulopathy.
Choosing the Right Catheter
- It depends upon external circumference of the catheter.
- Inside space of the catheter (it is known as lumen). Smallest size lumen is necessary to drain completely.
- Material used like silicone, latex or Teflon or a combination of these. The material selected will depend on how long the catheter will be in place.
- Length, shape, design and structural features are important. Doctor decide the length of tube , size of collection bag and means of attachment upon patient’s ability to walk, how and where to store or wear collection bag and how often bag is to be empty.
- Type of catheter depends upon lifestyle of patient.
Removal of Catheter
- It depends upon-
- Type of catheter.
- Purpose for which it is used.
- It can be removed after few minutes, hours or days or it may used for long time.
Complications of using Catheters
- Allergic reaction to material used in catheter
- Bladder stones
- Blood in the urine
- Blood in urine
- Burning of the urethra or genital area
- Cloudy urine due to pus
- Damage to kidneys
- Foul-smelling urine
- Indwelling catheters lead to urinary tract infections
- Infection of the urinary tract and kidneys
- Injury to urethra
- Leaking of urine out of the catheter
- Low back pain
- Stricture formation
- Symptoms of urinary tract infection-
- Urethral trauma
Precaution While Using Catheter
- Drink plenty of water to keep urine clear or slightly. It helps to prevent infection.
- For reusable catheters- Make sure to clean both the catheter and the areas where it enters the body with soap and water to reduce the risk of a UTI.
- Empty the drainage bag used to collect the urine at least every 8 hours and whenever the bag is full.
- Use a plastic squirt bottle containing a mixture of vinegar and water or bleach and water to clean the drainage bag.