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Noise from implantable Cooper cable.

V Carrington1, L Zhou, N Donaldson

  • 1UCL Implanted Devices Group, University College London, UK.

Medical & Biological Engineering & Computing
|January 18, 2006
PubMed
Summary
This summary is machine-generated.

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Cooper cables demonstrate excellent durability for recording neural signals, showing minimal noise increase after extensive flexing. However, transmitting power and signals together in these cables is not recommended due to potential leakage.

Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Materials Science

Background:

  • Cooper cables are commonly used for implanted devices, primarily for stimulation.
  • Their suitability for recording electroneurogram (ENG) signals from cuffs is not well-established.

Purpose of the Study:

  • To evaluate the performance and durability of Cooper cables for ENG signal recording.
  • To assess the impact of prolonged use and environmental factors on cable integrity and signal quality.

Main Methods:

  • Four Cooper cables underwent continuous flexion (2 Hz) in saline for 184 million cycles.
  • Noise levels in the neural band (500-5000 Hz) and ENG band were measured using a low-noise amplifier and spectrum analyzer.
  • A severe test involved applying 18V to cable cores to assess power transmission compatibility.

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Main Results:

  • Cables showed no fractures after 184 million flexions; neural band noise remained stable.
  • ENG band noise increased by less than 3 dB due to motion.
  • A worn cable failed, exposing conductors, detected by increased motion-induced noise.
  • Applying voltage revealed increased noise in two cables during motion, indicating potential leakage.

Conclusions:

  • Cooper cables are highly reliable for transmitting neural signals alone.
  • Simultaneous transmission of neural signals and power supplies in Cooper cables should be avoided due to potential noise and leakage issues.