Abstract: Objective  To  summarize reportson experience using the GuidezillaTM extension catheter for complex coronary lesions at the documented institution and evaluation of its safety and efficacy. Methods  We retrospectively collected 53 cases from the Cardiology Department of Handan First  Hospital from January of 2017 to December of 2018 who had received percutaneous coronary intervention (PCI). GuidezillaTM extension catheter was used during PCI Since the balloon or stent cannot pass leision.The  clinical, angiographic and procedural data of all 53 procedures were collected. the safety and efficacy of this novel equipment was evaluated.In addition，recorde the successful rate and the incidence of complications. the adverse cardiovascular events were also recorded during followup. Results  53 patients were received with GuidezillaTM extensionassisted balloon and stent to achieve coronary artery lesions for PCI. The mean depth of intubation was 19.38±12.66  mm.Stent implantation was successful in 49 out of 53 procedures (92.5%). 45 cases via radial artery, 8 cases via arteria femoralis,  4 cases of target abnormal openings,  22 cases of target vessel narrow openings,  19 cases of chronic,  totally occluded (CTO) 9 cases circuity pathological changes,  19 cases of calcified lesions, 9 cases of tortuosity lesions and 24 case of tortuosity and calcified lesions.1cases of rotational atherectomy. None of the patients experienced coronary dissection,  thrombogenesis air embolism, or other major complications during the procedure.Conclusion  The use of GuidezillaTMguide extension catheter to support extension catheter assisted balloon and stent to reach the lesion site of complex coronary lesion is safe and effective and has a higher success rate and less complications.

Key words: angioplasty, , balloon, , coronary；GuidezillaTMextensioncatheter；complex coronary lesion