Drive for diaphragm or piston pump for dosing of media, e.g. medicine into body

摘要

The drive comprises SMA components (9). The diaphragm (7), the piston (3) and the associated valves (2,4) are connected with the SMA components such that the diaphragm, piston and the valves are moved back and forth by contraction of SMA components. The contraction is resulted from heating. The opening and closing of the inlet and outlet aperture to the dosing chamber is carried out by a hose. The piston and the valves are pressed on the inlet hose (6), the diaphragm, and the outlet hose (8) via springs (5).