Figure 2
From: Optically Guided Epidural Needle Placement Using 405-nm Wavelength for Accurate Puncture
Optical-guide Location Device Appearance and Interface. (A) Epidural Space Location Needle: A probe embedded with one 100-µm and two 200-µm optical fibers. 200-µm fibers receive reflected light from the tissues irradiated by the 405-nm laser emitted through the 100-µm fiber inside the needle probe. (B) Epidural Space Locator apparatus: A power source supplies power to the laser diode emitting 405-nm laser beam, and converts the reflected optical signals to digital data and display data on a TFT screen.
