Urinary catheters
Urinary catheter gauges
The French scale (Fr.) is used to denote the
size of catheters. Each unit is roughly equivalent to 0.33 mm in diameter (that
is, 18 Fr. indicates a diameter of 6 mm). The smaller the number, the smaller
the catheter. A larger sized catheter is used for a male because it is stiffer,
thus easier to push the distance of the male urethra. Catheters come in several
sizes:
–
a. Number 8 Fr. and 10 Fr. are used for
children.
–
b. Number 14 Fr. and 16 Fr. are used for female
adults.
–
c. Number 20 Fr. and 22 Fr. are usually used for
male adults.
Intermittent Catheter. An intermittent catheter is used to
drain the bladder for short periods (5-10 minutes). It may be inserted by the
patient.
Retention/Indwelling Catheter. This type of catheter is
placed into the bladder and secured there for a period of time.
Supra Pubic Catheter. This type of catheter is inserted into
the bladder through a small incision above the
pubic area. It is used for
continuous drainage.
Catheterization of the urinary bladder is the
insertion of a hollow tube through the urethra into the bladder for removing
urine. It is an aseptic procedure for which sterile equipment is required.
Purpose of using urinary catheterization
a. Relieve Urinary Retention.
b. Obtain a Sterile Urine Specimen from a Female Patient.
c. Measure Residual Urine.
d. Empty the Bladder Before, During, or After Surgery.
e. Allows accurate measurement of urine output.
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