Abstract: An apparatus includes a proximal shaft configured to mechanically couple to a motor, a first universal joint, a middle shaft coupled to the proximal shaft via the first universal joint, a housing having a bore, a second universal joint within the bore, a distal shaft coupled to the middle shaft via the second universal joint, and a connector disposed over the distal shaft. The bore limits a downward tilt of the distal shaft such that, as a rotor approaches the distal shaft, the distal shaft becomes axially aligned with the rotor by virtue of the proximal end of the rotor entering the connector or vice versa. A spring connected proximally to the connector and distally to the second universal joint is configured to decompress, thereby reversibly coupling the connector to the proximal end of the rotor, upon the motor rotationally aligning the connector with the proximal end of the rotor.

Abstract: A sealing assembly for a progressive cavity pump and a progressive cavity pump assembly having a retaining sleeve, a ring, and an elastic diaphragm terminating in a first end of the diaphragm in a first opening, and in a second end of the diaphragm, opposite the first end, in a second opening larger than the first opening. The second opening is held in contact with the retaining sleeve by the ring, and the first opening is configured to grip a rotor of the progressive cavity pump, and the ring is configured to hold the second opening fixed with respect to a stator of the progressive cavity pump.

Abstract: A medical device having a housing, an annular fixture contained in the housing and having a central opening, a needle having a proximal end contained within the central opening of the annular fixture and a distal end protruding out of the housing, a motion assembly, which is configured to move the needle longitudinally back and forth relative to the annular fixture and the housing, and a flexible diaphragm comprising a peripheral part that seals externally around the annular fixture and an inner sleeve that seals around the proximal end of the needle, whereby movement of the needle back and forth causes the sleeve to evert and invert within the central opening while maintaining a vacuum seal between the annular fixture and the needle.