System for blocking a nerve comprising an echogenic stimulating needle and a drug delivery catheter

摘要

An apparatus and method for blockage of a peripheral nerve of a patient utilizes simultaneous continuous electrical nerve stimulation and visualization of the nerve using 2D ultrasound. A hyperechoic stimulating block needle is provided for insertion into the patient. The needle includes a hollow metal conduit, and a generally non-conductive covering extending along the shaft of the conduit. An echogenic surface capable of scattering and reflecting ultrasound waves for enhanced visualisation extends along at least a portion of the length of the needle. The needle is inserted into the patient, and the needle tip is optimally aligned in proximity with the nerve by simultaneous visualization with 2D ultrasound and by electrical nerve stimulation. Once the needle is optimally placed with regard to the nerve, a drug may be injected through a catheter passing through the needle, the catheter being capable of continuous administration of a drug therethrough upon removal of the needle.