Patent ID: 8142351
Filing Date: 2012-03-27
Classification: A61B,G02B

Abstract:
1. An endoscope insertion portion, wherein the endoscope insertion portion extends in an axial direction and comprises: an exterior unit forming an outer frame of a distal end portion of the insertion portion; an imaging unit provided within the exterior unit, extending in the axial direction, configured to acquire an observation image and including a cylindrical supporting member which extends in the axial direction and has a heat-insulating function, a distal end optical member which is arranged at a distal end portion of the supporting member within the supporting member and a movable optical member which is configured to be moved in the axial direction relative to the distal end optical member, and having an optical axis; an actuator unit provided within the supporting member, arranged at an outer peripheral surface portion of the supporting member, extending in the axial direction, configured to drive the movable optical member and including a shape memory member which is configured to deform according to temperature; and a heater unit provided within the supporting member, arranged at an inner peripheral surface portion of the supporting member, extending in the axial direction, arranged on a side opposite to a side on which the actuator unit is arranged relative to the optical axis of the imaging unit when viewing in the axial direction of the insertion portion, configured to heat the distal end optical member and including a heating member which is thermally connected to a proximal end side portion of the distal end optical member on the side opposite to the side on which the actuator unit is arranged relative to the optical axis of the imaging unit when viewing in the axial direction of the insertion portion and is configured to produce heat.