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.
Comparison of a bevel tip passive needle and an active symmetric tip needle insertions. (a) Passive bevel tip needle. (b) Active symmetric tip needle with a comparable deflection. (c)Active symmetric tip needle but without optical actuation, demonstrating a straight insertion trajectory.
