A modified bilateral carotid artery stenosis procedure to develop a chronic cerebral hypoperfusion rat model with an increased survival rate

•Bilateral carotid artery occlusion results in substantial mortality in rats.•Modifications prolong the experimental period or require additional materials.•Approximately 89±8% stenosis of both carotid arteries was established with a 32G needle.•This method produced a chronic cerebral hypoperfusion model with an increased survival rate.