PK(Pharmacokinetic) Papyrus Covered Coronary Stent System

Inclusion Criteria:

* Patients with acute perforations of native coronary arteries and coronary bypass grafts in vessels 2.5 to 5.0 mm in diameter

Exclusion Criteria:

* Patients in whom antiplatelet agents or anticoagulation therapy is contraindicated.
* Patients with a known allergy or hypersensitivity to amorphous silicon carbide or any other compound of the system (siloxane-based polyurethane, L-605 cobalt chromium alloy including tungsten and nickel).
* Lesions that cannot be reached or treated with the system.
* Lesions with threatened or abrupt closure during attempted pre-dilation prior to stent implantation.
* Risk of treatment-related occlusion of vital coronary artery side branches.
* Uncorrected bleeding disorders.
* Allergy to contrast media.