To complete the surgery, the hole in the dura must be completely sealed to prevent leaking of cerebrospinal fluid.

为了完成整个手术，硬脊膜上的小孔必须完全密封防止脑脊液漏出。

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This type of surgery involves constantx-rays and can take a long time to complete, exposing the physician toharmful radiation and mandating that they wear a heavy protective vestwhile operating.

这类手术需要恒定的X光，并且需要耗费很长时间才能完成。 手术过程中放射出的X光会对医生造成有害辐射，在手术过程中必须要求医生穿上防护性背心。

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Doctors said that this surgery is not complicated, just half an hour to complete, not only pain, the patient can be discharged from hospital two or three days.

医生表示，这种手术并不复杂，只需要半个小时就可以完成，不仅没有痛苦，患者两三天就可以出院。

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The company chose not to commercialize the initial device because the surgery was complicated, taking four surgeons eight hours to complete it, said Dr. Greenberg.

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The procedure would take six days to complete with doctors performing surgery on two to three patients a day.

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For Sharapova, it's a chance to complete a comeback from a 2008 shoulder injury that dropped her from the No. 1 spot and eventually required surgery.

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