Equipment Nonsterile gloves Barrier precautions as indicated (eg, face mask, safety glasses or face shield, cap and gown) Antiseptic solution (eg, chlorhexidine, povidone-iodine, alcohol) Injectable local anesthetic * such as lidocaine 2% with epinephrine † 1: 100, 000 or, for longer-duration anesthesia, bupivacaine 0.5% with epinephrine † 1: 200, 000 Syringe (eg, 10 mL) and needle (eg, 25 or 27 gauge, 3.5 cm long) for anesthetic injection For ultrasonography: Ultrasound machine with high-frequency (eg, 7.5 MHz or higher) linear array probe (transducer); probe cover (eg, transparent sterile dressing, single-use probe cover); sterile, water-based lubricant, single-use packet (preferred over multi-use bottle of ultrasound gel) * Local anesthetics are discussed in Lacerations.