Ultrasound endoscope distal end portion to accommodate bend wires and wiring substrate

1. An ultrasound endoscope distal end portion comprising:

an ultrasound transducer that is provided at a distal end of an insertion portion and has an ultrasound transmission/reception surface that transmits/receives ultrasound and a back surface positioned on a side opposite to the ultrasound transmission/reception surface;

a wiring substrate that is arranged on the back surface and is electrically connected to the ultrasound transducer;

a plurality of wires that include a bending portion that is connected to the wiring substrate from an upward direction which is a direction toward the ultrasound transmission/reception surface viewed from the wiring substrate to a backward direction which is a direction opposite to the upward direction and thereafter bent toward a direction different from an insertion axis which is a direction in which the insertion portion is inserted;

a restricting section that is disposed so as to cover the wiring substrate and is made of a non-conductive material;

a wiring substrate side fitting section that is provided on the wiring substrate and fits with the restricting section; and

a first restricting section side fitting section that is provided in the restricting section and fits with the wiring substrate.

2. The ultrasound endoscope distal end portion according to claim 1 , further comprising:

a backing member that is disposed on the back surface and fills the wiring substrate so that a part of the wiring substrate is exposed;

a holding frame that holds the backing member by surrounding a whole circumference on a side of the sideward direction of the backing member, the sideward direction being a direction crossing a direction from the upward direction toward the backward direction; and

a fixing section that fixes the restricting section to the backing member or the holding section, and thereby prevents wobbling of the wiring substrate and maintains connection between the ultrasound transducer and the wiring substrate.

3. The ultrasound endoscope distal end portion according to claim 1 , wherein the restricting section comprises a wiring holding portion that holds the bending portion so that a bending state of the wiring is maintained.

4. The ultrasound endoscope distal end portion according to claim 1 , wherein the wiring substrate is bonded and fixed to the restricting section.

5. The ultrasound endoscope distal end portion according to claim 2 , wherein the fixing section is a layer of an adhesive, and the restricting section and the backing member or the holding frame are fixed using an adhesive.

6. The ultrasound endoscope distal end portion according to claim 2 , further comprising a housing that houses the ultrasound transducer, the wiring substrate, the backing member, the holding frame, the restricting section and the wiring so that the ultrasound transmission/reception surface is exposed,

wherein the housing comprises a housing side fitting section that fits with the restricting section while in contact with a face on the side of the sideward direction of the restricting section.

7. The ultrasound endoscope distal end portion according to claim 1 ,

wherein the restricting section comprises two holders, and

the two holders sandwich and fix the wiring substrate so as to cover a connection portion of the plurality of wires electrically connected to the wiring substrate.