Splint

A splint is a type of device used to restrain limbs that are broken or otherwise injured

Usage
During the 1960s, Naked Snake utilized splints in his field medical kit during the Virtuous Mission and Operation Snake Eater. He was forced to use them in the conclusion of the former mission due to injuries he sustained in his confrontation with The Boss at the Dolinovodno bridge, namely for his broken left elbow. During this instance, he also had to bite down on the splint so he could relocate his left elbow with his free hand. The GRU Spetsnaz soldiers also carried them on hand.

Behind the scenes
The Splint appeared as a healing item for use in the survival viewer menu of Metal Gear Solid 3: Snake Eater. The player has limited amounts of splints in the beginning of the game, but can procure more either ready-made in certain locations, or by creating some from the ezo comfrey, idnentifiable as a squat bushy shrub with purple flowers.