A-A-53511
The positive traction device shall consist of a ratchet assembly fabricated of A-380 aluminum die castings with spring loaded lock-pin to apply positive locking, 18 degrees per engagement, to the distal (ankle) end of the splint. The positive traction device shall require no more than a manual force for operation. A nylon webbing traction strap approximately 2 inches wide by 19-1/2 inches long shall be permanently attached to the ratchet assembly. An “S” hook shall be attached to the free end of the traction strap which provides a means for connection to the tri-ring ankle strap.
The heel stand shall be adjustable and self locking and shall be attached to both sides of the lower frame to elevate the leg at least 4 inches from the ground. Stand shall be “U” shaped and fabricated of corrosion resistant metal.
The tri-ring ankle strap shall be nylon webbed strap partially covered with 1/2 inch thick closed cell foam to protect and immobilize the foot and ankle when attached to the traction strap. The strap shall be “T” shaped to wrap around the ankle with “D” rings attached to each end for connection to the ratchet traction strap. The strap shall be 2 inches wide by approximately 32 inches long to fit an adult.
A nylon webbing thigh strap shall be provided. Each strap shall be composed of two pieces connected in the middle, to form a lower and an upper loop. The lower loops are to be connected around the two aluminum tubes which form the leg support frame, and shall be fabricated from nonelastic polypropylene material with hook and pile closure. Each lower loop shall be 3 inches wide by 20-1/2 inches long.
The upper loop of each leg securing strap shall be fabricated from nylon elastic material with hook and pile closures. The upper loops will enclose the leg at four locations; two above the knee and two below the knee. The upper loops shall be furnished in the following sizes:
Strap 1: Below calf strap shall be 3 inches wide and 17-1/2 inches long.
Strap 2: Below knee strap shall be 3 inches wide and 17-1/2 inches long.
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