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While the Alzet® pump (Figure 4) could only be used for 14 days, the iPRECIO® pump (same infusion flow-rate as Alzet®), after transcutaneous refills, maintained an elevated level of arterial pressure. There are longer duration Alzet® pumps but they operate with a lower infusion rate. iPRECIO® pumps will infuse for up to 6 months at 1 μl/h. The longest duration Alzet® pump would only infuse for 6 weeks.
