Lidocaine Patches for Attenuating the Pain of Venipuncture Intravenous Cannulation

Inclusion Criteria: * Patients who want to participate present study and sign the informed consent form * Age from 18 to 65 years old * Patients who need intravenous cannulation before surgery * ASA class I-II and selected patients Exclusion Criteria: * Allergic to lidocaine or any other amide local anesthetics or any other medicine * Allergic skin(allergic to past agent or other topical used medicine) * Skin injured or inflection exist in the local site to patch * Sensation disturbed in any limb * Severe liver and kidney original disease:blood Aspertate aminotransferase and Alanine transaminase increased 1.5 times more than normal concentration; blood creatinine is higher than the normal range. * Hemoglobin \<80g/L * ECG is significantly abnormal * pregnant or possible pregnant or breastfeeding woman * Patient who has consciousness disturbance can not make credible dialog with investigator. * Those who are using other medicine may affect the evaluation of present patch * Those who have participated in other clinical trail in the past three months * Those excluded by investigator believed other reasons.