An Ultrasonically Powered Implantable Micro-Oxygen Generator (IMOG)

Teimour Maleki, Purdue University
Ning Cao, Purdue University
Seung Hyun Song, Purdue University
Chinghai Kao
Song-Chu Ko, Purdue University
Babak Ziaie, Purdue University

Date of this Version

11-2011

Citation

IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, VOL. 58, NO. 11, NOVEMBER 2011

Abstract

In this paper, we present an ultrasonically powered implantable micro-oxygen generator (IMOG) that is capable of in situ tumor oxygenation through water electrolysis. Such active mode of oxygen generation is not affected by increased interstitial pressure or abnormal blood vessels that typically limit the systemic delivery of oxygen to hypoxic regions of solid tumors. Wireless ultrasonic powering (2.15 MHz) was employed to increase the penetration depth and eliminate the directional sensitivity associated with magnetic methods. In addition, ultrasonic powering allowed for further reduction in the total size of the implant by eliminating the need for a large area inductor. IMOG has an overall dimension of 1.2 mm x 1.3 mm x 8 mm, small enough to be implanted using a hypodermic needle or a trocar. In vitro and ex vivo experiments showed that IMOG is capable of generating more than 150 mu A which, in turn, can create 0.525 mu L/min of oxygen through electrolytic disassociation. In vivo experiments in a well-known hypoxic pancreatic tumor models (1 cm(3) in size) also verified adequate in situ tumor oxygenation in less than 10 min.

Discipline(s)

Nanoscience and Nanotechnology

 

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