Abstract: Stabilizing arterial blood flow in the presence of arterial irregularities by insertion of a flow modulating device in the opening of a deformed artery to alter the admittance phasor to match the input impedance of the artery. The device comprises a plug having a central passageway therethrough adapted to receive an insert and the insert having an interior passageway therethrough which when the insert is positioned in the central passageway alters the admittance phasor to match the input impedance. This result obtains because the device reduces the interior diameter of the artery at the opening of the artery into a second, larger artery through which blood flows into the first artery from the second artery.