Ultrasound-guided piercing needle and indwelling needle

摘要

An ultrasound-guided piercing needle constituting the internal needle of an indwelling needle has ridged and grooved portions which reflect ultrasonic waves. The ridged and grooved portions comprise grooves, which are disposed on the outer periphery near the tip having a blade face, and ridges, which are arranged on both sides of the grooves.

主权项

1. An ultrasound-guided piercing needle having an annular ridged and grooved portion, which reflects ultrasonic waves, the ridged and grooved portion comprising:
an annular grooved portion provided in an outer circumferential surface of a needle body near a distal portion having a blade face; and annular ridged portions provided on both sides of the grooved portion in an axial direction of the needle body, an outer diameter of the ridged portions being greater than an outer diameter of the outer circumferential surface of the needle body; wherein the annular ridged portions are arcuate in cross section and formed with a substantially constant height over a circumferential direction.