Method of providing surgical access through an incision

摘要: An active cannula or sleeve which does more than merely maintain a channel passage is usable to create and/or enlarge passage, position scope instrument, move locate tissue, etc. The can vary in size shape as needed, intraoperatively. Because of the present invention expandable, surgeon make small relatively incision, stretch tissue with expandable cannula, contract and remove it, allowing skin come back its unstretched condition. Thus, smaller incision be made fit same instrument. This results less trauma scarring an easier operation. cannulas are assume such non-circular shape, into natural opening cause trauma. devices used seal off space; expand existing space potential for working visualization; (for example, incision) protect it.