ULTRASONIC TREATMENT DEVICE
An ultrasonic treatment device including, a vibration transmitting portion, an inner surface which defines an internal space, a first tube which extends along the longitudinal axis in an internal space, a path portion which is provided on the inner circumferential side of the first tube, and a first spacer which intervenes between the inner surface and the first tube at a node position of the ultrasonic vibration in a longitudinal axis and which supports the first tube so that the outer circumferential surface of the first tube does not contact the inner surface.
1 . An ultrasonic treatment device comprising:
a vibration transmitting portion which extends along a longitudinal axis and which transmits ultrasonic vibration from a proximal direction to a distal direction;
an inner surface which defines an internal space along the longitudinal axis inside the vibration transmitting portion; a first tube which extends along the longitudinal axis in the vibration transmitting portion the internal space;
a path portion which is provided on the inner circumferential side of the first tube and through which a suction target to be suctioned passes toward the proximal direction; and
a first spacer which intervenes between inside of the vibration transmitting portion the inner surface and an outer circumferential surface of the first tube at a node position of the ultrasonic vibration in a longitudinal axis direction parallel to the longitudinal axis and which supports the first tube so that the outer circumferential surface of the first tube does not contact the inner surface;
a second tube disposed inside the first tube, extending along the longitudinal axis, and permitting a suction target to be suctioned toward the proximal direction;
a second spacer located off the node position of the ultrasonic vibration where the first spacer is located such that a clearance is formed between an inner circumferential surface of the first tube and an outer circumferential surface of the second tube, and configured to support the second tube in a state where the outer circumferential surface of the second tube is prevented from coming into contact with the inner circumferential surface of the first tube.
2 . The ultrasonic treatment device according to claim 1 , wherein the first spacer and the second spacer are lower in heat conductivity than the ultrasonic wave transmitting portion.
3 . The ultrasonic treatment device according to claim 1 , wherein a first axially parallel dimension of the first spacer in the longitudinal axis direction is smaller than a second axially parallel dimension of the second spacer in the longitudinal axis direction.
4 . The ultrasonic treatment device according to claim 1 , wherein the inner circumferential surface of the second tube has higher slipperiness than the inner surface of the vibration transmitting portion.
5 . The ultrasonic treatment device according to claim 1 , wherein the first tube and the second tube extends in the internal space and is attachable and detachable from the vibration transmitting portion.
6 . The ultrasonic treatment device according to claim 1 , wherein the first spacer abuts on the outer circumferential portion of the first tube in part of a range in a direction around the longitudinal axis.
7 . The ultrasonic treatment device according to claim 1 , wherein the first tube and the first spacer are lower in heat conductivity than the vibration transmitting portion, and
the inner circumferential surface of the first tube has higher slipperiness than the inner surface of the vibration transmitting portion.
8 . The ultrasonic treatment device according to claim 7 , further comprising a ring member which is formed by the integration of the first tube and the first spacer and which abuts on the inner surface circumferentially in a direction around the longitudinal axis and in which the path portion is formed.
9 . The ultrasonic treatment device according to claim 8 , wherein the ring member is provided over a predetermined range which includes the node position where the first spacer is located in the longitudinal axis direction and which is smaller than a quarter wavelength of the ultrasonic vibration.