Endoscopic treatment instrument
An endoscopic treatment instrument is provided which includes: a flexible sheath; a wire disposed inside the sheath so as to advance and retreat; a restriction member which restricts a movement of the wire in the sheath to a proximal side; an operating portion connected to a proximal end of the sheath; a wire operating portion which is connected to a proximal end of the wire and disposed to advance and retreat relative to the operating portion; a resilient member which has a first end and a second end and of which the first end is connected to the wire operating portion to expand and contract between the second end; a movable member which is connected to the second end so as to be movable relative to the operating portion; and a control member which is disposed in the movable member and which switches the movable member between a movable state and a fixed state relative to the operating portion.
1. An endoscopic treatment instrument comprising:
a flexible sheath;
a wire disposed inside the sheath so as to advance and retreat;
a restriction member which restricts movement of the wire in the sheath to a proximal side;
an operating portion connected to a proximal end of the sheath;
a wire operating portion which is connected to a proximal end of the wire and disposed to advance and retreat relative to the operating portion;
a resilient member which has a first end and a second end, wherein the first end is connected to the wire operating portion and wherein the first end of the resilient member expands and contracts from the second end;
a movable member which is connected to the second end so as to be movable relative to the operating portion; and
a control member which is disposed in the movable member and which switches the movable member between a movable state and a fixed state relative to the operating portion,
wherein the sheath further comprises:
a hollow puncture needle which houses the wire having a hard needle portion disposed at the distal end thereof so as to advance and retreat; and
an outer sheath which houses the puncture needle so as to advance and retreat, wherein
a resilient restoring force of the resilient member is set to be smaller than a frictional force generated over an entire length between the wire and the puncture needle.
2. The endoscopic treatment instrument according to claim 1 , wherein the movable member is slidable relative to the operating portion, and wherein the control member protrudes from the movable member and is resiliently deformed in a direction of reducing a diameter of the movable member.
3. The endoscopic treatment instrument according to claim 1 , wherein the resilient member is a spring member.