Endoscope balloon, endoscope balloon unit, and endoscope

1 . An endoscope balloon that covers an ultrasonic transducer provided in a distal end part body of an endoscope insertion part, the endoscope balloon configured separately from the distal end part body, the endoscope balloon comprising:

a cover body that has a shape which is closed on a distal end side in a first direction corresponding to a longitudinal direction of the endoscope insertion part and has an opening on a base end side in the first direction, includes a bulging portion configured to bulge by storing an ultrasonic transmission medium, and is mounted on the distal end part body and is configured to cover the ultrasonic transducer;

a fixing body that is provided on the base end side with respect to the cover body and that is fixed to a fixed part of the endoscope insertion part; and

a connecting body that connects the cover body and the fixing body, and has an open window that is configured to be at a position corresponding to a treatment tool outlet port provided in the distal end part body,

wherein the fixing body has a tubular shape configured to allow the distal end part body of the endoscope to be removably inserted, and

the fixing body is configured to be disposed on the base end side of the treatment tool outlet port in the first direction.

2 . The endoscope balloon according to claim 1 ,

wherein the fixing body is closely fixed to the fixed part.

3 . The endoscope balloon according to claim 1 ,

wherein the fixing body is configured of a tubular body having a through-passage in the first direction, and

an inner peripheral surface of the tubular body is fixed to the fixed part.

4 . The endoscope balloon according to claim 3 ,

wherein the opening of the cover body is provided at a position intersecting an extension direction of an axis of the through-passage.

5 . The endoscope balloon according to claim 1 ,

wherein the fixing body is fixed to the distal end part body as the fixed part.

6 . The endoscope balloon according to claim 1 , wherein the fixing body is configured to be fixed to a bendable part provided on the base end side of the distal end part body of the endoscope insertion part.

7 . The endoscope balloon according to claim 1 , wherein the cover body has a cover body fixing portion that is configured to be fixed to the distal end part body.

8 . The endoscope balloon according to claim 7 , wherein the cover body fixing portion has a pair of fixing surfaces facing each other in a second direction orthogonal to the first direction, and the pair of fixing surfaces are configured to elastically hold the distal end part body.

9 . The endoscope balloon according to claim 1 , wherein the connecting body has a gutter shape that is configured to be open on a side where the treatment tool outlet port is provided.

10 . The endoscope balloon according to claim 1 ,

wherein the cover body has

an inner part,

an outer part that covers the inner part, and

a storage part that stores the ultrasonic transmission medium between the inner part and the outer part, and

the outer part has the bulging portion at a position configured to face a transducer surface of the ultrasonic transducer.

11 . The endoscope balloon according to claim 10 ,

wherein the inner part, the connecting body, and the fixing body are integrally formed.

12 . The endoscope balloon according to claim 10 ,

wherein the connecting body has a communication port that communicates with the storage part.

13 . An endoscope balloon unit comprising:

the endoscope balloon according to claim 1 ;

an attachment member that is configured to be attachable to and detachable from an operation part connected to the base end side of the endoscope insertion part and has a supply/discharge port for supplying and discharging the ultrasonic transmission medium; and

a pipe line member that sends the ultrasonic transmission medium between the attachment member and the endoscope balloon.

14 . An endoscope mounted with the endoscope balloon unit according to claim 13 .