Ultrasound-guided perineural catheters have already arrived.
Swenson
Jeff
J
D000779:Anesthetics, Local / Q000008:administration & dosage*; D002404:Catheterization / Q000295:instrumentation*; D006801:Humans; D009407:Nerve Block / Q000295:instrumentation*; D018084:Ultrasonography, Interventional / Q000379:methods*
D000779:Anesthetics, Local