Liquid spray tool for endoscope

1. A liquid spray tool for an endoscope configured to spray solution to in vivo tissue, comprising:

a flexible tube to be inserted into and extracted from a treatment tool insertion channel of the endoscope;

a liquid storage pouch configured to pool the solution to be conveyed into the flexible tube therein;

a liquid measuring pouch for measuring an amount of the solution to be conveyed into the flexible tube, the liquid measuring pouch being arranged between a rear end of the flexible tube and a distal end of the liquid storage pouch; and

a first one-way valve arranged between the liquid storage pouch and the liquid measuring pouch, the first one-way valve being configured to allow the solution to pass theretrough from an inside of the liquid storage pouch to an inside of the liquid measuring pouch, and to prevent the solution from passing theretrough from the inside of the liquid measuring pouch to the inside of the liquid storage pouch.

2. The liquid spray tool according to claim 1 ,

wherein the liquid measuring pouch is configured to have a volume smaller than that of the liquid storage pouch.

3. The liquid spray tool according to claim 1 ,

wherein the liquid storage pouch is formed from opaque material.

4. The liquid spray tool according to claim 1 ,

wherein the first one-way valve is formed with the distal end of the liquid storage pouch being narrowed.

5. The liquid spray tool according to claim 1 ,

wherein the liquid measuring pouch includes a scale for measuring an amount of the solution pooled therein.

6. The liquid spray tool according to claim 1 ,

wherein all of outer surface portions thereof, including a distal end of the flexible tube, are sealed against an outside of the liquid spray tool.

7. The liquid spray tool according to claim 6 ,

wherein the distal end of the flexible tube is sealed by welding.

8. The liquid spray tool according to claim 1 , further comprising a stopple for sealing a distal end of the flexible tube.

9. The liquid spray tool according to claim 1 , further comprising a second one-way valve configured to allow air to pass therethrough from an outside to an inside of the liquid storage pouch into the liquid storage pouch, and to prevent the solution from passing therethrough from the inside to the outside of the liquid storage pouch.

10. The liquid spray tool according to claim 1 ,

wherein the liquid storage pouch is formed from resilient material.

11. The liquid spray tool according to claim 10 ,

wherein the liquid storage pouch is formed from silicon rubber.

12. The liquid spray tool according to claim 1 ,

wherein the liquid measuring pouch is formed from transparent resilient material.

13. The liquid spray tool according to claim 12 ,

wherein the liquid measuring pouch is formed from silicon rubber.

14. The liquid spray tool according to claim 1 ,

wherein the flexible tube is formed from the same material as at least one of the liquid storage pouch and liquid measuring pouch.

15. The liquid spray tool according to claim 1 ,

wherein the flexible tube is formed from silicon rubber.

16. The liquid spray tool according to claim 1 ,

wherein the flexible tube is formed from material of a stiffness higher than silicon rubber.

17. The liquid spray tool according to claim 16 ,

wherein the flexible tube is formed from silicon resin.

18. The liquid spray tool according to claim 16 ,

wherein the flexible tube is formed from fluorocarbon resin.