Obstetric Instruments

A Pinnard Fetoscope (Pinard horn) is a mechanical acoustic horn (150-200 mm length, 40-60 mm bell) for auscultation of fetal heart sounds through the maternal abdomen, available in traditional metal (stainless steel/chrome-plated, 150-300g, autoclavable, durable, requires warming) and modern plastic (medical-grade polymer, 30-80g, lightweight, unbreakable, economical, not autoclavable) versions. The flared bell collects fetal heart sounds, concentrating them through the tapered horn to the single earpiece for mechanical amplification (10-20 dB). Primary clinical applications include intermittent fetal heart rate monitoring during prenatal care and labor in low-risk pregnancies, confirming fetal viability, determining fetal presentation and position through point of maximal intensity, monitoring multiple gestations, and providing non-interventive fetal assessment in natural childbirth, home birth, and resource-limited settings. Class I medical device. Requires significant practitioner training and experience; reliable after 18-20 weeks gestation; limited by maternal obesity, anterior placenta, and ambient noise. Critical safety considerations include infection control (metal autoclavable, plastic chemical disinfection only), gentle abdominal pressure, maternal positioning, and recognition that Pinnard is not a replacement for electronic monitoring in high-risk pregnancies.