A post-occlusion chamber collapse canceling system for a surgical apparatusthat detects the breaking of occlusions by tissue fragments in the distal endof the aspiration path and produces a response comprising a transitory blockageof the distal end the aspiration path to terminate the chamber collapse and a simultaneoustransitory venting of the aspiration line to relieve the vacuum, in a way thatpost-occlusion chamber collapses are cancelled. Disclosed herein, in a preferredembodiment, is a surgical system and related method for preventing collapseof a body chamber being operated upon, due to a vacuum surge following a clearingof an occlusion in an aspiration path of the surgical system, comprising: an occlusion-breaksensor (300) for sensing the clearing of the occlusion； a normally-open occlusionvalve (57), temporarily closing in response to the occlusion-break sensor sensingthe clearing of the occlusion, thereby occluding fluid flow through the aspirationpath and controllably stabilizing the occlusion break, thereby preventingthe vacuum surge and consequent body chamber collapse； and a normally- closedventing valve temporarily opening in response to the occlusion-break sensorsensing the clearing of the occlusion, to reduce the vacuum thereby preventingthe vacuum surge and consequent body chamber collapse. In an alternative embodiment,the normally-open occlusion valve may be omitted.
