Electromyometrial imaging (EMMI) technology has emerged as one of the promising technology that can be used for non-invasive pregnancy risk stratification and for preventing complications due to pre-term birth. Current EMMI systems are bulky and require a tethered connection to desktop instrumentation, as a result, the system cannot be used in non-clinical and ambulatory settings. In this paper, we propose an approach for designing a scalable, portable wireless EMMI recording system that can be used for in-home and remote monitoring. The wearable system uses a non-equilibrium differential electrode multiplexing approach to enhance signal acquisition bandwidth and to reduce the artifacts due to electrode drifts, amplifier 1/f noise, and bio-potential amplifier saturation. A combination of active shielding, a passive filter network, and a high-end instrumentation amplifier ensures sufficient input dynamic range (<inline-formula><tex-math notation="LaTeX">$&gt;100~dB$</tex-math></inline-formula>) such that the system can simultaneously acquire different bio-potential signals like maternal electrocardiogram (ECG) in addition to the EMMI electromyogram (EMG) signals. We show that the switching artifacts and the channel cross-talk introduced due to non-equilibrium sampling can be reduced using a compensation technique. This enables the system to be potentially scaled to a large number of channels without significantly increasing the system power dissipation. We demonstrate the feasibility of the proposed approach in a clinical setting using an 8-channel battery-powered prototype which dissipates less than 8&#x00A0;<inline-formula><tex-math notation="LaTeX">$\mu$</tex-math></inline-formula>W per channel for a signal bandwidth of 1KHz.

Original languageEnglish
Pages (from-to)1-12
Number of pages12
JournalIEEE Transactions on Biomedical Circuits and Systems
StateAccepted/In press - 2023


  • Biomedical monitoring
  • Capacitance
  • ECG
  • Electrocardiography
  • Electrodes
  • Electromyometrial Imaging
  • Instruments
  • Multi-channel Instrumentation
  • Multiplexing
  • Pre-term labor
  • Recording
  • Wearable


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