Abstract: A flexible prosthetic liner having a proximal access opening for a stump of a limb and a distal end region as well as a flexible tension member which is arranged in the distal 5 end region on the prosthetic liner. The tension member is detachably fastened to the prosthetic liner by means of a closure system that can be actuated without a tool. A prosthetic shaft system may be formed by such a prosthetic liner and a prosthetic shaft.

Abstract: A method for determining the fibrinogen level of a patient blood plasma in an optical density based prothrombin time test. The method and apparatus utilize a novel parameter DELTA which factors out statistical inaccuracies associated with prior art test methods. The patient fibrinogen level is determined using DELTA points calculated from blood samples having known fibrinogen levels in the low, normal and high ranges. A piece wise function is then constructed around the DELTA points and the fibrinogen level of a patient blood sample is calculated using four equations pre-stored in a non-volatile memory.