title: A Wireless Implantable Micropump for Chronic Drug Infusion Against Cancer.
abstract: We present an implantable micropump with a miniature form factor and completely wireless operation that enables chronic drug administration intended for evaluation and development of cancer therapies in freely moving small research animals such as rodents. The low power electrolysis actuator avoids the need for heavy implantable batteries. The infusion system features a class E inductive powering system that provides on-demand activation of the pump as well as remote adjustment of the delivery regimen without animal handling. Micropump performance was demonstrated using a model anti-cancer application in which daily doses of 30 μL were supplied for several weeks with less than 6% variation in flow rate within a single pump and less than 8% variation across different pumps. Pumping under different back pressure, viscosity, and temperature conditions were investigated; parameters were chosen so as to mimicin vivoconditions. In benchtop tests under simulatedin vivoconditions, micropumps provided consistent and reliable performance over a period of 30 days with less than 4% flow rate variation. The demonstrated prototype has potential to provide a practical solution for remote chronic administration of drugs to ambulatory small animals for research as well as drug discovery and development applications.
authors: Department of Biomedical Engineering, Viterbi School of Engineering, University of Southern California, 1042 Downey Way, DRB-140, Los Angeles, CA 90089-1111, USA.
authors: Angelica
authors: A
authors: Cobo
authors: Department of Biomedical Engineering, Viterbi School of Engineering, University of Southern California, 1042 Downey Way, DRB-140, Los Angeles, CA 90089-1111, USA.
authors: Roya
authors: R
authors: Sheybani
authors: Department of Biomedical Engineering, Viterbi School of Engineering, University of Southern California, 1042 Downey Way, DRB-140, Los Angeles, CA 90089-1111, USA.
authors: Heidi
authors: H
authors: Tu
authors: Department of Biomedical Engineering, Viterbi School of Engineering, University of Southern California, 1042 Downey Way, DRB-140, Los Angeles, CA 90089-1111, USA; Department of Electrical Engineering, Viterbi School of Engineering, University of Southern California, 3651 Watt Way, VHE-602, Los Angeles, CA 90089-0241, USA.
authors: Ellis
authors: E
authors: Meng
keywords: Drug delivery; MEMS electrochemical bellows actuator; cancer; check valve; implantable micropumps; wireless powering