A System of midwifery : including the diseases of pregnancy and the puerperal state . n may be performed in various ways. The simplestprocess is that of immediate transfusion by some such simple apparatusas has been recommended by Dr. Aveling.1 This is described as con-sisting of two small silver tubes, to enter the vessels, and of an india-rubber tube by which they are united, and which has in its centre anelastic receptacle, holding about two drachms. It is without valves,and is simply a continuous pipe with an expanded portion in themiddle. By its means, the vessels are, as it were, extende
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A System of midwifery : including the diseases of pregnancy and the puerperal state . n may be performed in various ways. The simplestprocess is that of immediate transfusion by some such simple apparatusas has been recommended by Dr. Aveling.1 This is described as con-sisting of two small silver tubes, to enter the vessels, and of an india-rubber tube by which they are united, and which has in its centre anelastic receptacle, holding about two drachms. It is without valves, and is simply a continuous pipe with an expanded portion in themiddle. By its means, the vessels are, as it were, extended from oneto the other, and a supplementary heart is added to regulate the cir-culation. Air is got rid of by first pumping water or a saline solu- 1 Obstetrical Transactions, vol. vi, p. 133, 1865. XX IT.] TRANSFUSION. 41 tion through it, and then seeing that it is quite full of blood before thetube is inserted into the recipient vein. In what has been called, in contradistinction from the other, themediate process, the blood is first received in a vessel, in which it is Fig. 132. Avelings apparatus for transfusion. kept at the proper temperature, and it is thence injected by means of asyringe, different varieties of which have been devised by Drs. Little, Richardson, and Graily Hewitt. In addition to the difficulty whichattends the exclusion of air, another and no less formidable one con-sists in the tendency of the blood to rapid coagulation. It has beenattempted, with the view of obviating the latter, to inject the defibri-nated blood only, the blood being received in an open vessel, rapidlystirred so as to promote coagulation, and then filtered. In a consider-able number of cases, this process has been attended with successfulresults, sufficient at least to prove that the presence of fibrin is notessential ; but the preponderance of professional opinion is decidedlyin favor of the immediate process. It has been proposed by Dr.Richardson, as a corollary to certain well-known