If left to gravity, by comparison, syringes will run dry in a short time. The fluid's gravity will be high enough to suck the plunger through the syringe (with nothing moving it), injecting the fluid based on the height of the syringe compared to the user.
FREMONT, CA: Infusion pumps deliver fluids from various containers (bags, bottles, syringes) into veins and arteries. All hospitals use them, especially Intensive Care Units, where one pump is usually needed for each drug. But are infusion pumps the actual pumps? These devices often have sufficient power to pump fluids, including almost viscous ones; tiny catheters pump the fluid into patients' blood vessels. This usually happens at very high flow rates of up to 2 or 3 liters per minute (for emergency blood transfusions). But, in many situations, they do not pump the devices. So, what are they doing instead?
There are two chief types of infusion pumps:
Large Volumetric Pumps (LVPs): Supply fluid from bags or bottles, much like the drip below.
Syringe Pumps: Provide smaller quantities of fluids through a syringe.
Large Volumetric Pumps
These pumps are situated above the patient's head, meaning the action is required to decrease the flow that will typically result from gravity (free flow). Mechanisms such as 'peristaltic fingers' will regulate this free flow. They do have drip chambers and roller clamps for these infusion devices and can be used much as a normal gravity drip. Usually, though, a roller clamp is only used to stop the flow while nurses fill the bag or control it if, for any reason, the pump fails.
Drugs can also be administered via a syringe. One can imagine how painful it is to push the plunger of a syringe physically; it feels rigid and can result in finger pain for nurses prescribing the medication. If left to gravity, by comparison, syringes will run dry in a short time. The fluid's gravity will be high enough to suck the plunger through the syringe (with nothing moving it), injecting the fluid based on the height of the syringe compared to the user. This process is called siphoning. That is where syringe pumps play a significant function. They keep the plunger syringe in place, stopping it from siphoning. Then shift a set of 'syringe grippers' at a closely regulated. A group of 'syringe grippers' then move at a tightly controlled pace to control the syringe plunger and, therefore, the flow rate–while the 'syringe clamp' holds the syringe body in place.