期刊
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
卷 61, 期 6, 页码 1822-1832出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TBME.2014.2308058
关键词
Cochlear implants; inverse problems; noninvasive treatments; scanning probe microscopy; sensor systems
资金
- Cornell NanoScale Facility, a member of the National Nanotechnology Infrastructure Network
- National Science Foundation [ECS-0335765, CHE-0957313]
- Center for Functional Nanomaterials, Brookhaven National Laboratory
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0957313] Funding Source: National Science Foundation
A growing number of minimally invasive surgical and diagnostic procedures require the insertion of an optical, mechanical, or electronic device in narrow spaces inside a human body. In such procedures, precise motion control is essential to avoid damage to the patient's tissues and/or the device itself. A typical example is the insertion of a cochlear implant which should ideally be done with minimum physical contact between the moving device and the cochlear canal walls or the basilar membrane. Because optical monitoring is not possible, alternative techniques for sub millimeter-scale distance control can be very useful for such procedures. The first requirement for distance control is distance sensing. We developed a novel approach to distance sensing based on the principles of scanning electrochemical microscopy (SECM). The SECM signal, i.e., the diffusion current to a microelectrode, is very sensitive to the distance between the probe surface and any electrically insulating object present in its proximity. With several amperometric microprobes fabricated on the surface of an insertable device, one can monitor the distances between different parts of the moving implant and the surrounding tissues. Unlike typical SECM experiments, in which a disk-shaped tip approaches a relatively smooth sample, complex geometries of the mobile device and its surroundings make distance sensing challenging. Additional issues include the possibility of electrode surface contamination in biological fluids and the requirement for a biologically compatible redox mediator.
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