A linear damper includes a conical housing with a friction cone in the housing and a rod extending therethrough and axially moveable relative thereto. They can be employed for treating andor preventing several diseases, in particular coronary syndromes, neurodegenerative disorders as well as for reducing cholesterol levels. In the present invention, on the one hand, the independent input means integrated with computer main can be connected with the input means to constitute a set of microcomputer, on the other hand, it can also conveniently be separated from the output means so as to be used independently.