The product is used to provide a channel for introducing balloon catheter, guidewire or other treatment device in an interventional surgery characteristics： 1、PTFE inner tube design, providing superb pushability when support device delivering2、304V Stainless steel braiding, less pitch size offers phenomenal support and kink resistance 3、18mm flexible distal segment, ensure perfect transition from distal to proximal end, providing excellent steerability and torque control