Patent ID: 8251898

Claim:
Laryngoscope apparatus comprising: (a) a curved laryngoscope blade having a trailing spatula section and a leading spatula section terminating at a leading blade tip; and (b) an optical system having a line of sight with a field of view and including an eyepiece lens and an aperture lens defining an optical axis, said aperture lens located along said laryngoscope blade for demarcating said leading spatula section, said aperture lens having a rearmost concave surface and a forwardmost concave inclined prism surface respectively facing towards and away from said eyepiece lens, said rearmost concave surface providing an initial magnified field of view along said line of sight, said forwardmost concave inclined prism surface further magnifying said initial magnified field of view along said line of sight, said forwardmost concave inclined prism surface defining an imaginary plane subtending an included acute prism angle with said optical axis in a side view of said laryngoscope blade for deflecting said line of sight away from said optical axis beyond said aperture lens towards said blade tip, wherein said plane subtends an included prism angle α=55°±3.0° and said forwardmost concave inclined prism surface has an 180±6.0 mm radius of curvature.