Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Ultra-tapered mechanical dilator. (a) Ultra-tapered mechanical dilator. The tip is extremely tapered up to 2.5 Fr and a radiopaque ring (arrow) is implanted 1 cm from the tip to facilitate visibility on fluorography.(b) Condition of the catheter mounted over the guidewire. The step between the catheter tip and the guidewire is extremely small for easy penetration of the needle tract (ES dilator; Zeon Medical Co., Ltd., Tokyo, Japan)
