brain selfretaining retractor

例句：

1. 1.The brain selfretaining retractor is a surgical tool used to stabilize the brain during craniotomy.
   脑自持式拉钩是一种手术工具，用于颅骨切开术中稳定大脑。
2. 2.During the operation, the surgeon carefully placed the brain selfretaining retractor to avoid damaging the surrounding tissue.
   在手术过程中，外科医生小心地放置了脑自持式拉钩，以避免损伤周围的组织。
3. 3. The patient's head was fixed in place with the brain selfretaining retractor, allowingfor precise dissection of the tumor.
   患者头部被脑自持式拉钩固定住，以便能够精确地切除肿瘤。