Medical flushing pump comprising two suction lines
The present invention relates to a device for flushing a body cavity with a fluid, the fluid being pumped by means of two lines from the body cavity. The respective pumping capacity is regulated via controllable pinch valves, the two pinch valves being coupled in an antiparallel manner.
1. A device for flushing a body cavity (K), comprising
(i) a storage container ( 1 ) for the flushing liq¬uid,
(ii) a supply line ( 2 ),
(iii) a controlled roller wheel pump ( 3 ),
(iv) a controlled vacuum pump ( 4 ),
(v) a first medical instrument ( 5 ) with a first suction line ( 6 ),
(vi) a second medical instrument ( 7 ) with a second suction line ( 8 ),
(vii) optionally a third suction line ( 9 ) with a throttle ( 10 ),
(viii) a first pinch valve ( 11 ) at the first suction line ( 6 ),
(ix) a second pinch valve ( 12 ) at the second suction line ( 8 ),
(x) a waste container ( 13 ), connected to the first suction line ( 6 ), second suction line ( 8 ), and optional third suction line ( 9 ), and to the controlled vacuum pump ( 4 ),
characterized by that the first pinch valve ( 11 ) and the second pinch valve ( 12 ) are coupled in an anti¬parallel manner,
wherein the antiparallel coupling takes place such that the first and the second pinch valves ( 11 , 12 ) are formed by pinch elements that are respectively attached on two gear racks ( 14 , 15 ), and the two gear racks ( 14 , 15 ) are coupled to each other by means of a gear wheel ( 16 ), so that they are moved for an antiparallel movement,
wherein one or more position sensors ( 19 ) provided at the gear wheel ( 16 ) and/or the two gear racks ( 14 , 15 ), which enables, at any point of time, an absolute determination of a position of the gear wheel ( 16 ) and the two gear racks ( 14 , 15 ) moved thereby,
wherein the gear wheel ( 16 ) is driven by a motor-gear combination which is selected such that a speed of travel of the two gear racks ( 14 , 15 ) is maximum in the phases, in which there is no contact of the pinch elements or the two gear racks with a tube to be pinched and that a reduction of the speed of the two gear racks to 50% in the last 10 to 20% of the travel, until the tube is completely pinched, is performed, and
wherein the motor-gear combination driving the gear wheel ( 16 ) which in turn move the two gear racks ( 14 , 15 ) provides a speed-of-travel profile, in which for a short travel before the tube contact, the speed of travel is reduced, and at an occasion of tube contact of one of the two gear racks an increase of speed of travel occurs, with a subsequent continuous reduction to zero in the position, in which the tube is completely pinched.