IV infusion pumps are medical devices that deliver fluids, nutrients, blood products, or medications directly into a patient’s bloodstream at carefully controlled rates. They matter because many treatments must be given slowly, steadily, and accurately to be safe and effective. A small error in flow rate can lead to underdosing, overdosing, or fluid overload.
Modern pumps combine mechanical control, sensors, alarms, and software to support precise drug delivery.
Key Facts
- Flow rate formula: rate = volume ÷ time
- Common unit for IV infusion rate: mL/h
- Dose rate formula: dose rate = concentration × flow rate
- Total volume delivered: volume = rate × time
- Occlusion pressure increases when tubing is kinked, clamped, or blocked.
- Smart pumps use drug libraries, dose limits, and alarms to reduce medication errors.
Vocabulary
- Infusion pump
- A medical device that pushes fluid through IV tubing into a patient at a programmed rate.
- Flow rate
- The volume of fluid delivered per unit time, often measured in milliliters per hour.
- Occlusion
- A blockage in the IV line that prevents fluid from flowing normally.
- Catheter
- A thin flexible tube inserted into a vein to allow IV fluid or medicine to enter the bloodstream.
- Dose limit
- A safety setting that warns users when a programmed medication amount or rate is outside an allowed range.
Common Mistakes to Avoid
- Confusing mL with mL/h is wrong because volume and flow rate are different quantities. A pump set to 50 mL/h delivers 50 mL only after one full hour.
- Ignoring medication concentration is wrong because the same flow rate can deliver very different drug doses. Dose depends on both concentration and rate.
- Assuming gravity flow and pump flow are the same is wrong because a pump actively controls delivery while gravity flow depends on height, tubing resistance, and clamps.
- Silencing an alarm without checking the line is wrong because alarms may indicate air, occlusion, empty fluid, low battery, or an unsafe programming issue.
Practice Questions
- 1 A patient must receive 250 mL of saline over 5 hours. What flow rate in mL/h should the infusion pump be programmed to deliver?
- 2 A medication has a concentration of 2 mg/mL and the pump is set to 12 mL/h. What dose rate in mg/h is the patient receiving?
- 3 An infusion pump alarm reports high pressure during delivery. Explain two possible causes in the tubing or catheter line and why the pump should not simply be ignored.