Abstract
steam radiator with “U” tubes of glass set in discs of hard rubber fixed on a central glass rod. All this was enclosed in a water jacket. In spite of our fear that the blood pressure might be insufficient to force the blood through this long course (about 80 inches) it works well, and we have carried on an experiment for five hours. The difficulty in preventing leaks where the celloidin tube is tied on the glass we have obviated by first wrapping the joint with rubber adhesive plaster and then tying. The difficulty in tying on the tubes of the inner row when the “U” tubes are ranged round a disc, we have removed by spreading out the “U” tubes flat in a square frame made of rubber and glass which can be turned over when it is necessary to tie the lower row. When the sheaf of tubes is enclosed in a water cylinder plugged at both ends, it is impossible to remedy a leak except by stopping the experiment, but we have simply laid our square frame in an enamel pan of the fluid covered with a glass lid and can reach any part of it at any time without disturbing the circulation.
Hirudin is very expensive and we have therefore defibrinated the blood of our animals realizing the possible objections to this. Instead of starting with the celloidin tubes full of salt solution they are filled with defibrinated blood of another normal dog and enough of this is kept in a funnel or tank connected with the inlet tube to allow some blood from the machine to run through the outlet tube into the vein while a similar amount is bled from the carotid and defibrinated.
Get full access to this article
View all access options for this article.