Study Purpose The safety and efficacy of paclitaxel controlled release balloon catheter VasoguardTM in treatment of small vessel lesion.

Study Group Experimental group: paclitaxel controlled release balloon catheter (VasoguardTM) Control group: common balloon catheter (Maverick2)

Inclusion Criteria:

Subject need 18 to 80 years of aged male or non-pregnant women; Subject has stable anina pectoris, or unstable anina pectoris, or old myocardial infarction patients, or ischemia with evidence but without symptom; Subject has a life expectancy of more than 2 years; Lesion vessel reference diameter is less than or equal to 2.5mm, target lesion length is less than or equal to 40mm; Target lesion stenosis is equal or greater than 70% or 50% and with ischemia; Single or two coronary small vessel lesions in situ; Subject can understand the trail purpose, sign informed consent voluntarily, agree to accept clinical telephone follow-up and angiographic follow-up at 9 months; Target lesion can be pre-expanded successfully (Guide wire can get through lesion, balloon pre-expand the remnant stenosis of vessel lumen is less or equal to 50%, without current limiting interlayer and thrombosis).

Exclusion Criteria:

Patient that in the opinion of the investigator is not appropriate for this trail; Pregnancy and lactation female patients; Patient has a life expectancy of less than 2 years; Severe congestive heart failure or NYHA IV heart failure; Patient who have bleeding constitution, cannot use antithrombotic and antiplatelet drugs; Patient that happened acute myocardial infarction within a week; Patient who happened stroke within six months; Patient who with severe renal failure (GFR≤30ml/Min); Patient has received heart transplantation; Patient who cannot tolerate aspirin and / or P2Y12 receptor inhibitor drugs; Patient who has allergy to paclitaxel, PLGA or contrast agent; Peptic ulcer or gastrointestinal bleeding within the prior 6 months; Patients who are participating in another drug or device clinical trail, which have not completed the primary endpoint follow- up period.

Angiographic relevant： Merge three or more coronary small vessel lesions; Target vessel with extensive thrombosis evidence; Restenosis of vein graft after bypass surgery; Target lesion proximal exist seriously distorted or severe calcified lesion.