Patent ID: 9089263
Filing Date: 2015-07-28
Classification: A61B,G02B

Abstract:
1. An instrument lifting operation device for an endoscope for remotely controlling, from an operation unit connected to a proximal end of an insertion unit, an instrument lifting piece movably arranged on a tip side of the insertion unit of the endoscope, comprising: an operation wire drawing mechanism configured to draw, in response to a manual operation, an proximal end of an operation wire whose tip is connected to the instrument lifting piece; and a braking mechanism configured to restrict movement of the operation wire toward the tip side by a drawing force applied to the operation wire from the instrument lifting piece, wherein the operation wire drawing mechanism and the braking mechanism are arranged in the operation unit of the endoscope, wherein the operation wire drawing mechanism includes: an instrument lifting operation member which is rotatable about an axis; and a wire coupling member to which the proximal end of the operation wire is connected, the wire coupling member being arranged to be rotated about the axis by the instrument lifting operation member, wherein the braking mechanism includes: a fixed wall fixedly arranged in the operation unit to have a shape of an arc having a center corresponding to the axis and a spring arranged to be able to rotate about the axis together with the instrument lifting operation member in a state where the spring is elastically pressed against an inner circumferential surface of the fixed wall, the inner circumferential surface of the fixed wall having a constant diameter, wherein when the instrument lifting operation member is operated to rotate about the axis, the wire coupling member rotates about the axis and the operation wire moves forward and backward in a state where the spring contacts and slides on the inner circumferential surface of the fixed wall to generate frictional resistance at a contacting part of the spring and the inner circumferential surface of the fixed wall, and