Development of laser ruler in rigid laryngoscope.
OBJECTIVE
The objective of this study was to develop a new device that provides a simple, noninvasive method of measuring accurate lesion size while using an endoscope.


METHODS
We developed a rigid laryngoscope with a built-in laser-ruler using a one-light emitting diode and an acrylic plate. The invention incorporates a built-in laser diode that projects an auto-parallel beam into the optical path of the rigid laryngoscope to form two spots in the field of view.


RESULTS
While the interspot distance remains consistent despite changes in focal plane, magnification, or viewing angle of the laryngoscope, projection to an uneven surface introduces certain variations in the shape, and size of the spots, and the distance between the two spots.


CONCLUSIONS
The device enables a laryngologist to easily measure the distance between landmarks, as well as the change in real size, and the progressive change of vocal fold lesions in an outpatient setting.
Department of Otorhinolaryngology-Head & Neck Surgery, School of Medicine, Pusan National University, Busan, Korea.
Young-Ok
YO
Lee
Byoung-Chul
BC
Kim
Jung-Hoon
JH
Lee
Jin-Choon
JC
Lee
Byung-Joo
BJ
Lee
Soo-Geun
SG
Wang
Jung-Hoon
JH
Ro
Gye-Rok
GR
Jeon
Bum-Joo
BJ
Shin