METHOD FOR IN VITRO SIMULATION AND EVALUATION OF PLATELET ADHESION IN BLOOD-CONTACTING MEDICAL DEVICES

• Main Authors: HU, Shengshou, LIU, Guangmao
• Format: Patent
• Language: English
• Published: 20.01.2022
• Subjects: BANDAGES, DRESSINGS OR ABSORBENT PADS; DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROMTHE BODY; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; FILTERS IMPLANTABLE INTO BLOOD VESSELS; FIRST-AID KITS; FOMENTATION; HUMAN NECESSITIES; HYGIENE; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; MEDICAL OR VETERINARY SCIENCE; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; PHYSICS; PROSTHESES; TESTING; TREATMENT OR PROTECTION OF EYES OR EARS

A method for in vitro simulation and evaluation of platelet adhesion in blood-contacting medical devices is disclosed, including the following steps: (1) using a glycerin aqueous solution with a mass percentage concentration of 40% in an extracorporeal circulation circuit to simulate a viscosity and hydrodynamic characteristics of blood, and adding fluorescent particles with a diameter of 3 μm to 5 μm to the solution to simulate platelets; (2) after the solution circulates in the circuit for a specified time period, removing flow passage components of a tested device, and observing the deposition of the fluorescent particles on a blood-contacting surface inside the device by naked eyes and photographs; and (3) using laser-induced fluorescence (LIF) technique to apply laser light on a device surface deposited with the fluorescent particles and in contact with blood, and using charge-coupled device (CCD) camera imaging to photograph the aggregation and adhesion of laser-induced fluorescent particles.