Prospective Post-market Evaluation of an Echogenic Catheter

Inclusion Criteria: * Patients scheduled to undergo breast surgery requiring use of a peripheral nerve block catheter for establishing a paravertebral block * Patients classified as ASA (American Society of Anesthesiologists) physical status I, II or III * Patients at least 18 years old * Patient is willing and able to provide informed consent for study participation * Patient has a good understanding of written and verbal English Exclusion Criteria: * Patient with contraindications to regional anesthesia technique (e.g. allergy to local anesthetic or other medications used in study) * Patient with known coagulopathy * Patient whose target nerve cannot be seen with linear ultrasound probe in a pre-procedure scan. All patients who need a curvilinear probe to visualize the target nerve will be excluded from the study. * Patients having mastectomy and immediate reconstruction