缺血组采用颈外动脉逆行置管，暂时夹闭颈总动脉，由导管内注入自体血凝块，建立脑缺血模型。
To set up the cerebral ischemic model, we retrogradely catheterized the external carotid artery, temporarily clipped the common carotid artery, then injected the autocoagnlated clot.
目的：探讨在胶原膜包绕情况下，骨缺损内填充自体静脉血凝块和异体骨成骨作用的比较。
Objective: to compare the osteogenic effect of autologous blood clot with that of bone allograft.
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