Abstract: The present guide extension catheter improves the safety of the coronary stenting procedure and overcomes various safety concerns associated with conventional guide extension catheters, such as stent disruption, compromise in blood flow to the heart (ischemia), and hydraulic dissection of the coronary artery. The guide extension catheter system is insertable into a guide catheter and the coronary artery to provide back-up support during coronary stenting. The guide extension catheter system is configured with a push handle at a proximal section, an alignment device at a middle section, and a perfusion tube positioned distally. The alignment device facilitates in alignment of the stent with the concave-shaped inlet at the proximal end of the perfusion tube for the entrance into the lumen of the perfusion tube. The enhanced surface provided by the concave-shaped inlet facilitates in prevention of the stent disruption during the stenting procedure.