1. TPU material with good bio-compatibility,no stimulation to the tissue. 2. Inner and outer diameter ratio is large and tube wall is thin,so that the drainage is smooth. 3. The radiopaque catheter is visible under X-Ray,convenient for clinical observation. thyroid surgery Product Code of Surgical Drainage Catheter Model Size Multichannel Type Double Cannula Type Relevant Clinical Departments: General Surgery Department, Cardiology Department, Orthopaedics Department, Plastics Surgical Department and so on.