Abstract: Apparatus for collecting body fluid utilizes a condition of negative pressure in a chamber for drawing body fluid from an area of a wound at a relatively constant flow rate. The apparatus includes a piston assembly movable in a housing from a first to a second position under forces of atmospheric pressure acting on the piston assembly. The apparatus further comprises an assembly for enabling operation of the piston assembly including at least one cylinder and piston movable therein by pulling on a hand gripping element attached to the piston to develop a partial vacuum in the cylinder. The piston assembly includes a diaphragm which is movable for maintaining the chamber sealed except through a port adapted for receipt of a tube connecting with said wound. The evacuator apparatus may be reused by emptying body fluid from the chamber and reenabling the piston assembly.

Abstract: A prosthetic knee joint comprising cooperating femoral and tibial components that allow controlled rotational movement during extension and flexion, simulating the anatomical movement characteristics of the natural knee joint.