| abstract |
Catheters are disclosed which are adapted for insertion into the heart and which include at least one inlet opening at the front end thereof, at least one outlet opening at the other end thereof, and at least one intermediate opening therebetween, and which include a cylindrical sleeve for opening and closing the intermediate opening so that it can be selectively opened and closed thereby. These catheters are employed most particularly for the withdrawal of blood from both the inferior vena cava and from the right auricle and/or from the superior vena cava of the heart. |