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Table 1 Characteristics of 4 tetrapolar probes used in the study.

From: The role of cervical Electrical Impedance Spectroscopy in the prediction of the course and outcome of induced labour

Name Pitch circle diameter
(mm)
Electrode separation
(between centres, mm)
Electrode diameter
(mm)
Probe diameter
(mm)
Peak current
(μA)
3 mm 2 1.41 0.6 5 3.00
6 mm 3 2.12 1.5 9 4.41
9 mm 5.5 3.89 1.5 10 8.33
12 mm 8.5 6.01 1.5 12 12.5
  1. All electrodes were made from 9 ct gold and were housed in a PEEK casing.