Two types of bipolar microelectrodes for intraretinal use

Area of Science:

• Neuroscience
• Biomedical Engineering
• Ophthalmology

Background:

• Intraretinal recordings are crucial for understanding retinal function.
• Development of advanced microelectrode technology is essential for precise neural signal acquisition.

Purpose of the Study:

• To describe the construction and performance of two novel bipolar microelectrode designs.
• To compare the electrical stability and mechanical properties of the developed microelectrodes.

Main Methods:

• Construction of a silver paint-coated glass micropipette electrode with a recording site 120 micrometers from the tip.
• Fabrication of a coaxial glass micropipette electrode with a 50 micrometer tip separation and varying tip diameters (10 and 1 micrometer).
• Evaluation of electrical stability and mechanical strength of both electrode types.

Main Results:

• The coaxial glass electrode exhibited enhanced electrical stability compared to the silver paint electrode.
• The coaxial glass electrode demonstrated superior mechanical strength.
• Intraretinal recordings were successfully obtained using the developed microelectrodes.

Conclusions:

• The coaxial glass micropipette electrode offers significant advantages in electrical stability and mechanical robustness for intraretinal recordings.
• These microelectrodes are suitable for detailed electrophysiological studies in the intact rhesus monkey retina.