Medison ER4-9/10ED Transvaginal Ultrasound Transducer for Obstetrics and Gynaecology Product Overview Medison ER4-9/10ED Transvaginal Ultrasound Transducer for Obstetrics and Gynaecology applications. Product Type Ultrasound Probe Array / Crystal / Scanhead / Acoustic Module / Transducer Brand Medison Model Number ER4-9/10ED Probe Type Transvaginal Technical Specifications Material Composition The active element is typically made of piezoelectric crystals or newer materials