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In the operation of direct transfusion of blood by the method of Crile, certain difficulties have sometimes been encountered, and efforts have been made by a number of operators to simplify the procedure. Some experience is required before the Crile instrument can be handled with ease; the caliber of the cuffed vessel is decreased by the canula; sometimes there is difficulty in telescoping the artery over the vein. The steps of the operation with Crile's canula are numerous, and the application of guide sutures and the tying of ligatures complicates the operation, as the following enumeration of the steps of the operation will show. The technic of direct transfusion by Crile's canula comprises the following:
The choice of the canula of the proper size.
The exposure of the vein of the recipient, its isolation and division.
The stripping back of the adventitia and the application of fine guide sutures.
ELSBERG CA. A SIMPLE CANULA FOR THE DIRECT TRANSFUSION OF BLOOD. JAMA. 1909;LII(11):887–888. doi:10.1001/jama.1909.25420370045004f
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