Table 1

Characteristics of 4 tetrapolar probes used in the study.

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


All electrodes were made from 9 ct gold and were housed in a PEEK casing.

Jokhi et al. BMC Pregnancy and Childbirth 2009 9:40   doi:10.1186/1471-2393-9-40

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