Various methods of making fibrin tissue adhesive from a patient's own blood were evaluated. The method using ammonium sulfate for fibrinogen preparation produced the greatest bonding strength. The average bonding strength of the commercially manufactured adhesive and of the autologous fibrin tissue adhesive were compared at 10 minutes and 30 minutes after glucing together lxl cm samples of fresh human dura. Results indicate the commercial glue holding 57 gms/cm2 at 10 minutes and 123 gms/cm2 at 30 minutes, while autologous glue prepared with the “ammonium sulfate method” has a bonding strength of 41 gms/cm2 at 10 minutes and 217 gms/cm2 at 30 minutes.

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A surgical tissue adhesive can be made from the patient's own blood. We have been refining the procedures for manufacturing autologous fibrin tissue adhesive to facilitate its use in the operating room and to increase its bonding strength. Fibrin tissue adhesive efficacy depends on fibrinogen concentration. We found that fibrinogen precipitation using the ammonium sulfate method produced the highest concentration. Bonding power was compared with that of the commercial glue 10 minutes and 30 minutes after glueing two pieces of 1 X 1 cm2 human dura together. Bonding strength of the autologous product was close to that of the commercial product. Comparisons of fibrinolysis inhibition time of autologous fibrin tissue adhesive and commercial glue in experiments on rats over a period of one hour to six days after subcutaneous injection are described.