There are two rudimentary categories of pumps made by Infusion Pump Manufacturers. Large-volume pumps can propel liquid replacement such as saline solution, medicines such as antibiotics, or nutrient mixtures big enough to feed a patient. Small-volume pumps permeate hormones, such as insulin, or other drugs, such as opiates.
Within these categories, some pumps are planned to be portable, others are intended to be used in a hospital, and there are special schemes for charity and battlefield use.
Large-volume pumps typically use some method of peristaltic pump. Typically, they use computer-controlled rollers squeezing a silicone-rubber tube through which the drug flows. Another shared method is a set of fingers that press on the tube in sequence.
Small-volume pumps typically use a computer-controlled motor turning a bolt that pushes the plunger on a syringe.
The classic medical invention for an infusion pump is to place a blood pressure cuff around a bag of liquid. The battlefield correspondent is to place the bag underneath the patient. The heaviness of the bag sets the distillation pressure. The pressure can essentially be read out at the cuff's pointer. The difficulty is that the flow differs dramatically with the cuff's pressure (or patient's mass), and the required pressure differs with the administration course, possibly instigating risk when tried by an individual not trained in this method.
Stations that must offer the least-expensive care often use pressurized infusion systems made by Infusion Pump Manufacturers in India. One common scheme has a purpose-designed plastic "pressure bottle" pressurized with a large throwaway plastic syringe. A joint flow restrictor, air filter, and drip chamber support a nurse set the flow. The parts are refillable, mass-produced sterile plastic, and can be fashioned by the same apparatuses that make plastic soft-drink bottles and caps. A pressure bottle, restrictor, and cavity need more nursing attention than electronically controlled pumps. In the parts where these are used, nurses are often helpers.
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