Development
VPG was first introduced in 1967 by Palti and Berovici, who affixed a light source and photosensitive cell onto a gynecological speculum and recorded vaginal pulse waves. Sintchak and Geer improved on the device in 1975 by using a vaginal probe. The vaginal photoplethysmograph was the first practical and reliable device for the measurement of vaginal blood flow.
Read more about this topic: Vaginal Photoplethysmograph
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