| 摘要 |
A cardioplegic controlling and regulating device for the dosed perfusion of cardioplegic perfusion solution in open-heart surgery has a storage container for receiving the cardioplegic solution, which container is part of a scale and can be connected to the heart over a tubular conduit. A pressure-controlled dosing pump which acts on the tubular conduit and cooperates with a second, reversible pump which is constructed as an exhaust pump and is selectively operable synchronously or asynchronously within controllable tolerance limits with the first dosing pump during the perfusion and sustaining of the perfusion. An ultrafilter for the mixture of blood and cardioplegic solution removed from the patient's heart is located in a removal line. An outlet for the blood separated form the ultrafilter is connected by a conduit to a blood storage container and the permeate or filtrate outlet of which ends in a filtrate line or in a filtrate collector vessel. The ultrafilter is located in a by-pass line to a blood storage container so that the patient's blood mixed with cardioplegic solution can be prepared to a hemoconcentrate after the perfusion has been completed. In the same manner, other blood removed by suction from the patient during the operation can be prepared by this by-pass line and the ultrafilter. Another pressure-controlled dosing pump sustains the first dosing pump and is connected to it in parallel. |
