A treatise on the science and practice of midwifery . the patient is now pinched (d), so as to form avacuum, and the bulb becomes filled with blood from the finger is now removed so as to compress the distal tube (d),and the bulb being compressed (c), its contents are injected into thepatients vein. The bulb is calculated to hold about two drachms,so that the amount injected can be estimated by the number of timesit is emptied. The risk of injecting air is prevented by filling thesyringe with Avater, which is injected before the blood. Injection of Defibrinated Blood.—For injecting d
A treatise on the science and practice of midwifery . the patient is now pinched (d), so as to form avacuum, and the bulb becomes filled with blood from the finger is now removed so as to compress the distal tube (d),and the bulb being compressed (c), its contents are injected into thepatients vein. The bulb is calculated to hold about two drachms,so that the amount injected can be estimated by the number of timesit is emptied. The risk of injecting air is prevented by filling thesyringe with Avater, which is injected before the blood. Injection of Defibrinated Blood.—For injecting defibrinated bloodvarious contrivances have been used. McDonnells instrument is asimple cylinder with a nozzle attached, from which the blood is pro- THE TRANSFUSION OF BLOOD 521 pelled by gravitation. When the propulsive power is insufficient,increased pressure is applied by breathing forcibly into the open endof the receiver. De Belinas instrument is on the same principle,only atmospheric pressure is supplied by a contrivance similar to Fig. i D Method of Transfusion by Avelings Apparatus. Kichardsons spray-producer, attached to one end. The idea is simple,but there is some doubt of a gravitation instrument being sufficientlypowerful, and it certainlyfailed in my hands. I have had valvesapplied to Avelings instrument, so that it works by compression ofthe bulb, like an ordinary Higginsons syringe. This, with a singlesilver canula at one end, for introduction into the vein, forms a per-fect and inexpensive transfusion apparatus, taking up scarcely anyspace. If it be not at hand, any small syringe, with a tolerably finenozzle, may be used. Mode of Preparing the Blood.—The first step of the operation isdefibrination of the blood, which should, if possible, be prepared inan apartment adjoining the patients. The blood should be takenfrom the arm of a strong and healthy man. The quality cannot beunimportant, and, in some recorded cases, the failure of the operation,has bee
Size: 2284px × 1094px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, bookidtre, booksubjectobstetrics
