A Karman cannula is a soft, flexible medical-grade plastic tube that gynecologists use for manual vacuum aspiration, uterine evacuation, endometrial biopsy, and miscarriage management. Available in eight color-coded sizes from 4 mm to 12 mm—yellow for 4mm through dark blue for 12 mm—at a standard working length of 22.8 cm. The smooth atraumatic, rounded tip reduces patient discomfort during uterine procedures. ISO 13485 and CE certified, EO sterilized, and compatible with all standard MVA syringes. GSTC manufactures and exports these ISO-certified Karman cannulas under the Heuer brand to hospitals and distributors across 60-plus countries worldwide.