element keeper 447 this protrusion is provided with the ratio of the lengths of movable element 418 and keeper 447 as well as disposition of limiting flange 448 on movable element 418 as a result in the inoperative position spring 441 holds movable element 418 in an extreme lower position needed for preventing lower holder part 407 from spontaneous falling out of upper holder part 406 thus batteries 421 422 are contacting with movable element 418 in any position the offered mechanism of interacting spring 441 batteries 421 422 and movable element 418 is novelty allowing simplifying the design of turning means 420 due to using only one spring 441 both as a battery holding means and as a spring of turning means 420 as well as enhancing a reliability of the electrical circuit due to decreasing the number of disconnectable contacts while in the identical mechanism in the prior art at least two springs as well as the disconnecting contact of the movable element and battery are used in fig3 32 is used holder subassembly 454 shown in fig2 to 30 and having a plastic housing 453 eliminating a short circuit between movable element 448 and lower holder part 407 in the inoperative position fig3 version embodiment 500 of the offered intubation laryngoscope shown in fig3 to 38.