Patent ID: 6755814
Filing Date: 2004-06-29
Classification: A61M

Abstract:
A compact implantable infusion pump comprising:a) a housing having a base plate and a propellant chamber disposed below the base plate, the base plate including a top and bottom surface and a depression formed in the base plate bottom surface, b) a bellow mechanism positioned within the housing propellant chamber underneath the housing base plate, the bellow mechanism having a base member and an internal volume, the bellow mechanism internal volume receiving a medicament for delivery into a patient's body, c) a constriction section communicating with the bellow mechanism internal volume and a catheter disposed within the patient's body for transferring the medicament into the patient's body from the bellow mechanism internal volume through the catheter and into the patient's body, and d) a resonant circuit including an inductance and a capacitance, the resonant circuit having a resonant frequency determined by a distance measured between the bellow mechanism base member and the housing base plate.