Patent ID: 7856730
Filing Date: 2010-12-28
Classification: A61B,G01B

Abstract:
1. An internal diameter measurement device configured for insertion into a cavity to measure an internal diameter thereof, the internal diameter measurement device comprising: a tubular insertion portion configured to be inserted into the cavity; a distending portion which is provided on a distal end portion of the insertion portion, and is configured to be capable of expanding by supplying a fluid to an inner portion thereof; at least one linear reference member having a first end portion and a second end portion; and a measuring portion which is provided in a proximal end portion of the insertion portion and configured to confirm the position of the second end portion of the reference member, wherein the first end portion of the reference member is fixed to the distending portion or the distal end portion of the insertion portion, the second end portion is fixed to the measurement portion, and the second end portion moves towards the distal end of the insertion portion in conjunction with the expansion of the distending portion.