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Infusion pump
An infusion pump or perfusor infuses fluids, medication or nutrients
into a patient's circulatory system. It is generally used intravenously,
although subcutaneous, arterial and epidural infusions are occasionally
used.
Infusion pumps can adminster fluids in ways that would
be impractically expensive or unreliable if performed manually by
nursing staff. For example, they can administer 1 mL per hour injections
(too small for a drip), injections every minute, injections with
repeated boluses requested by the patient, up to maximum number
per hour (e.g. in patient-controlled analgesia), or fluids whose
volumes vary by the time of day.
Because they can also produce quite high but controlled
pressures, they can inject controlled amounts of fluids
subcutaneously (beneath the skin), or epidurally (just
within the surface of the central nervous system- a
very popular local spinal anesthesia for childbirth).
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