| 摘要 |
A surgical instrument can be used to dilate a tissue within the body of a patient to create a working space within the body to allow a surgeon to easily advance an endoscope into a patient's body. In various embodiments, the surgical instrument can include a balloon capable of transitioning from a collapsed position to an expanded position and a sleeve at least partially surrounding the balloon when the balloon is in the collapsed position. The sleeve includes at least one frangible portion that may at least partially release along the frangible portion when the balloon transitions from the collapsed position to the expanded position. In various embodiments, the surgical instrument further includes a catheter, a needle, an endoscope or an endoscopic trocar.
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