Proximal Humerus Site for Anesthesia

Inclusion Criteria: * Age 21 years or older Have no amputation of the upper extremities Able to lay flat on table for up to 2 hours Self-reported as healthy, as confirmed by the PI Exclusion Criteria: * Have an active infection in the body Imprisoned Pregnant Cognitively impaired Fracture in humerus, or significant trauma to the site Excessive tissue and/or absence of adequate anatomical landmarks in humerus Infection in target area Humeral IO insertion in past 48 hours, prosthetic limb or joint or other significant orthopedic procedure in humerus Current use of anti-coagulants Current cardiac condition requiring pacemaker or anti-arrhythmic drugs Prior adverse reaction to lidocaine Volunteers with any of the following characteristics may be excluded from the infusion pathway evaluation involving administration of contrast dye at the discretion of the PI. Prior adverse reaction to contrast dye Allergy to any food or drug History of impaired renal function History of impaired hepatic function History of cardiac disease History of pheochromocytoma