US 12,303,328 B2
Ultrasonic endoscope and distal end unit thereof
Yuto Shimoyama, Kanagawa (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Jun. 16, 2023, as Appl. No. 18/336,022.
Application 18/336,022 is a continuation of application No. PCT/JP2021/047234, filed on Dec. 21, 2021.
Claims priority of application No. 2021-002650 (JP), filed on Jan. 12, 2021.
Prior Publication US 2023/0329671 A1, Oct. 19, 2023
Int. Cl. A61B 8/00 (2006.01); A61B 1/06 (2006.01); A61B 1/267 (2006.01); A61B 8/12 (2006.01)
CPC A61B 8/12 (2013.01) [A61B 1/06 (2013.01); A61B 1/2676 (2013.01); A61B 8/445 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An ultrasonic endoscope comprising:
a distal end part body provided on a distal end side of an insertion part; and
an ultrasound transducer provided on a distal end side of the distal end part body,
wherein an outer peripheral surface of the distal end part body includes
a first surface that is provided on a proximal end side of the ultrasound transducer and that extends along a longitudinal axis of the insertion part,
a second surface that is provided on a proximal end side of the first surface and that extends along the longitudinal axis, the second surface being positioned on a one direction side of a first direction perpendicular to the longitudinal axis with respect to the first surface, and
a stepped surface that connects the proximal end side of the first surface and a distal end side of the second surface, and
in a case where a direction perpendicular to both the longitudinal axis and the first direction is referred to as a second direction, an angle indicating an irradiation range of an ultrasonic wave emitted from the ultrasound transducer in a case where the distal end part body is viewed from a second direction side is referred to as an effective angle, and an intersection of a tangent line in contact with the ultrasound transducer and in contact with the stepped surface at a position closest to the one direction side and the ultrasound transducer is referred to as a first intersection, the first intersection is included in a range of 1/3 on a proximal end side of the effective angle.