Abstract: A shoe sole construction designed so as to be biodynamically shock-absorbing.In the sole are provided two cushions which are filled with a fluid and interconnected by means of a number of channels. One cushion is positioned underneath the heel of the foot and the other cushion is positioned underneath the transverse forward arch of the foot.When the wearer of the shoe sets down his foot into contact with the ground, the heel strikes the ground first and a shock-absorbing effect is then obtained as the rear cushion is compressed. Upon this compression, fluid flows from the rear cushion to the front cushion, which expands and lifts the front arch of the foot, releaving the weight thereon and supporting the front arch when the forefoot is set down on the ground. When the wearer continues the walking cycle, the forward cushion is compressed, causing the rear cushion to expand and the latter is again ready to provide a shock-absorbing effect upon the next step and heel strike.

Abstract: A surgical instrument is provided for engaging a bony part of the human body and guiding a drill bit into a specific location in the bony part comprising, in combination, a pair of lever arms pivotably attached at a point intermediate their ends; locking means for locking the arms together in a fixed position with respect to each other; means on each arm on the same side of the pivot attachment for manipulating the arms in a swinging movement about the pivot; each arm on the other side of the pivot attachment being shaped so that the pair of arms can embrace the bony part during an operation; one of the arms carrying on one end on said other side a guide head having at least one through passage to guide a drill bit and the other arm carrying at one end on the said side an engagement head, the inner facing surfaces of the guide head and engagement head being shaped to fixedly engage said bony part, the through passage in the guide head being aligned along an axis which in the operating position of the instrume