The Karman cannula is a soft, flexible medical-grade plastic tube used by gynecologists to connect to a manual vacuum aspiration syringe for safe uterine evacuation and endometrial biopsy. Its atraumatic rounded tip protects cervical and uterine tissue during insertion and removal. The transparent tube body allows real-time visual monitoring of aspirate contents during the procedure. It is available in 8 color-coded sizes ranging from 4 mm to 12 mm, with a standard working length of 22.8 cm, for immediate clinical use.