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Updated: Jul 17, 2026
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A Wireless, Bidirectional Interface for In Vivo Recording and Stimulation of Neural Activity in Freely Behaving Rats
Published on: November 7, 2017
In vitro and in vivo testing of a wireless multichannel stimulating telemetry microsystem
M Ghovanloo1, K J Otto, D R Kipke
1Department of Electrical Engineering and Computer Science, University of Michigan, MI, USA.
Summary
A new 64-site microstimulating system, Interestim-2B, offers flexible neural prosthesis control with integrated impedance measurement for chronic stimulation. This system enables precise current waveform generation and various stimulation protocols for advanced neural applications.
Area of Science:
- Biomedical Engineering
- Neuroscience
- Implantable Devices
Background:
- Neural prostheses require sophisticated microstimulation systems for precise neural interface.
- Existing systems often have limitations in flexibility, component count, and diagnostic capabilities.
- Inductively powered systems offer advantages for chronic implantation.
Purpose of the Study:
- To develop and characterize an inductively powered 64-site current microstimulating system (Interestim-2B) for neural prosthesis applications.
- To enable arbitrary current waveform generation and diverse stimulation protocols.
- To incorporate in situ site impedance measurement for chronic monitoring.
Main Methods:
- Design and implementation of a modular 64-site microstimulating system with minimal off-chip components.
- Development of arbitrary current waveform generation and support for monopolar/bipolar protocols.
- Integration of a common analog line for site potential access and charge exhaustion.
- Implementation of in situ site impedance measurement for defective site detection.
- In vitro and in vivo testing using a 16-site implant.
Main Results:
- Successful development of the Interestim-2B system with a modular architecture.
- Demonstrated capability for arbitrary current waveform generation and various stimulation protocols.
- Validated the functionality of the common analog line for charge management.
- Showcased the effectiveness of in situ impedance measurement for identifying defective sites.
- Presented positive in vitro and in vivo experimental results with a 16-site configuration.
Conclusions:
- The Interestim-2B system provides a flexible and integrated solution for neural prosthesis stimulation.
- The modular design and minimal component count facilitate practical implementation.
- In situ impedance measurement enhances the reliability and longevity of chronic stimulation.
- The system shows promise for advanced neural interfacing and therapeutic applications.