US Patent 8449500 Flow pulsatility dampening devices for closed-loop controlled infusion systems

A flow monitoring infusion system that includes an infusion circuit having a fluid with a pulsatile fluid flow flowing therethrough. The infusion circuit includes a dampening element having a dampening chamber that absorbs the pressure fluctuations of the pulsatile fluid flow to transform the pulsatile fluid flow to a more smooth fluid flow. A fluid flow sensor that measures the flowrate of the more smooth fluid flow is disposed along the infusion circuit downstream of the dampening element.