Sprung joint frame for prosthesis

摘要

The joint frame consists of two long flat strip pieces (1,2) which at their head ends (3,4) are connected together by a joint (5). The head end (3) of the first piece is made from two parallel shanks (6) and the flat head end (4) of the second piece (2) engages between these shanks allowing rotational movement about the connecting joint. The angle between the two pieces is fixed by means of a retaining screw (13) but can be up to a maximum of 100 deg. limited by a shaped piece (20) between the shanks.A rubber tie (9) is fixed by a screw (12) in the second piece and at its other end is connected to a pin (8) on the first piece which engages in a connection slot (7) around the joint. The rubber tie acts always to bring the joint into a position such that the frame is in the "extended" position by pulling the pin back around the slot.