The authors describe a "stabilizing hemostatic clamp" of their own design for use in end-to-side anastomosis. Its application facilitates simultaneous stabilization and hemostasis of the cortical artery at the site where anastomosis is to be performed. Using this instrument, the authors have performed anastomosis of the superficial temporal artery with a branch of the middle cerebral artery in 60 patients. On evaluation of the clinical effects of the treatment and results of control angiography, and taking into account the authors' relatively small experience with this type of surgical treatment, they conclude that their new clamp facilitates this form of surgery.