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Those who have witnessed or performed syringe-cannula transfusions realize the difficulties associated with the procedure. It was to obviate these, and at the same time lose none of the valuable features of the method, that I set out to devise my instrument.
DIFFICULTIES OF THE SYRINGE-CANNULA METHOD
The chief difficulties are: 1. The cannulas are repeatedly handled because (a) the syringes are being constantly connected and disconnected, and (b) they are pulled on when blood is aspirated, and pushed on when blood or saline is injected. When one considers the amount of handling necessitated in the transfusion of a syringeful, or 20 c.c., of blood, the large number of times the cannulas are jarred is evident. It is in the fact that the cannulas are handled frequently and directly that we find the cause of their dislodgment from the vein.2. The second great difficulty is the risk of clotting.
Unger LJ. A NEW METHOD OF SYRINGE TRANSFUSION. JAMA. 1915;LXIV(7):582–584. doi:10.1001/jama.1915.25710330001013
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