JP4390326B2 - Endoscope sprayer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endoscope spraying instrument that is used by being inserted through a treatment instrument insertion channel of an endoscope in order to spray liquid into a body cavity.
[0002]
[Prior art]
FIG. 5 shows a conventional endoscope spraying tool. A spiral groove 93 is formed on the outer peripheral surface of the distal end opening of a flexible liquid supply pipe 91 inserted into and removed from a treatment tool insertion channel of the endoscope. The formed screw body 92 is arranged.
[0003]
The liquid discharged from the tip of the liquid supply pipe 91 through the spiral groove 93 rotates around the axis on the inner side of the tip cap 94 covered by the screw body 92 so as to block the outer surface of the spiral groove 93. As described above, a liquid rotating chamber 95 is formed between the front end surface of the screw body 92, and the liquid is sprayed forward from an ejection hole 96 formed at the center position of the front end surface of the liquid rotating chamber 95. It is like that.
[0004]
[Problems to be solved by the invention]
The screw body 92 of the conventional endoscope spray tool as described above has a spiral groove 93 formed on the outer peripheral surface of a cylindrical material, and the liquid passing through the spiral groove 93 rotates around the axis. It is sent out to the liquid rotation chamber 95.
[0005]
Therefore, in order for the liquid that has entered the liquid rotating chamber 95 to be discharged from the ejection hole 96 formed at the center of the liquid rotating chamber 95, the flow direction must be changed in the liquid rotating chamber 95, so that the turbulent flow As a result, the rotational force of the flow was reduced, and the spray state tended to be insufficient.
[0006]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an endoscope spraying tool that can obtain a good spray state by discharging liquid from an ejection hole without reducing the rotational force applied in the spiral groove. To do.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, an endoscope spray tool according to the present invention is a front surface of a screw body in which a spiral groove for rotating a liquid sent from the rear through a liquid feeding tube around an axis is formed. In the endoscope spraying tool in which the liquid rotating chamber in which the ejection hole is formed in the central portion of the tip wall faces the side, the front half of the screw body is formed in a substantially hemispherical shape, The spiral groove of the strip is formed on the outer peripheral surface of the screw body.
[0008]
In addition, the front-end | tip part of the screw body may be formed in the shape sharpened toward the front, and in that case, the internal diameter of a liquid rotation chamber may be smoothly formed small toward the front side.
[0009]
Further, the tip portion of the screw body may be formed in a planar shape cut in a direction substantially perpendicular to the axis of the liquid rotating chamber, in which case the inner wall surface of the liquid rotating chamber is It may be formed in the same spherical shape.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a distal end portion of an endoscope spray tool according to a reference example of the present invention, and FIG. 2 is a sectional view taken along line II-II.
[0011]
A tip nozzle 1 for spraying liquid is attached to the tip of a liquid feeding tube 2 made of a flexible tube made of, for example, tetrafluoroethylene resin, which can be inserted into and removed from a treatment instrument insertion channel of an endoscope (not shown). It has been. An inlet for injecting the liquid into the liquid feeding pipe 2 is attached to the proximal end of the liquid feeding pipe 2 not shown.
[0012]
The tip nozzle 1 has a substantially U-shaped cross-sectional shape in the nozzle body 11 in which a spiral groove 15 for rotating the liquid sent through the liquid feeding pipe 2 around the axis is formed in the front side portion. The tip cap 12 formed in the shape of a cap is covered and fixed by caulking.
[0013]
A male threaded portion 13 is formed on the outer peripheral surface near the rear end of the nozzle body 11, and the male threaded portion 13 is screwed and bonded to the tip of the liquid feeding pipe 2 so that the nozzle main body 11 is attached to the liquid feeding pipe. It is connected and fixed to the tip of 2.
[0014]
A portion near the tip of the nozzle body 11 is a screw body 14 in which a plurality of (for example, eight) spiral grooves 15 are formed. The front half of the screw body 14 is formed in a substantially hemispherical shape, and the middle maximum diameter portion is in contact with the inner wall surface of the tip cap 12.
[0015]
FIG. 2 shows the cross-sectional shape of the portion, and FIG. 3 shows the shape of the screw body 14 viewed from the tip side. As shown in FIG. 1, the rear half of the screw body 14 is formed in a shape in which the outer diameter gradually decreases.
[0016]
A flow path hole 16 is formed in the axial position of the latter half portion of the nozzle body 11 from the rear end, and a plurality of communication holes 18 are formed in the intermediate annular groove 17 formed in the outer peripheral portion of the intermediate portion of the nozzle body 11. It communicates through.
[0017]
The intermediate annular groove 17 directly faces the rear end portion of the spiral groove 15. Therefore, the liquid sent from the rear through the liquid feeding pipe 2 passes through the flow path hole 16, passes through the intermediate annular groove 17 from the communication hole 18, and passes through the spiral groove 15, thereby rotating around the axis. It becomes a state to do.
[0018]
The space between the front side portion of the screw body 14 and the inner surface of the distal end wall of the distal end cap 12 is a liquid rotation in which the liquids fed from the plurality of spiral grooves 15 are rotated around the axis and rotated around the axis. It is chamber 20.
[0019]
A portion corresponding to a corner of the tip portion of the inner surface of the tip cap 12 is formed in a smooth arcuate curved surface, whereby the inner diameter of the liquid rotating chamber 20 is smoothly reduced toward the front side.
[0020]
The tip cap 12 is formed with an ejection hole 10 that penetrates the central portion of the tip wall of the liquid rotating chamber 20. And the front-end | tip part of the screw body 14 is formed in the shape sharpened small toward the center of the ejection hole 10, and the spiral groove 15 is formed in the screw body 14 to the front-end | tip part.
[0021]
Therefore, when the liquid is fed into the liquid feeding pipe 2 from the hand side, the liquid fed into the liquid rotating chamber 20 while rotating around the axis by passing through the spiral groove 15 has a radial spread from the ejection hole 10. Released (sprayed).
[0022]
Since the screw body 14 and the liquid rotating chamber 20 are formed in the shape as described above, the liquid sent from the spiral groove 15 into the liquid rotating chamber 20 flows smoothly toward the ejection hole 10. Therefore, the turbulent flow does not occur, and the rotational force applied in the spiral groove 15 is released from the ejection hole 10 without being diminished, and a strong and good spray state can be obtained.
[0023]
The present invention is as implementation forms that shown in Figure 4 if example embodiment, forming the tip portion of the screw body 14, in a plane that skived cut in a direction substantially perpendicular to the axis of the liquid rotating chamber 20 May be.
[0024]
In the form of implementation of this, the inner wall surface of the liquid rotating chamber 20, be formed in the same hemispherical and the front side half portion of the screw body 14, the screw member 14 is cut scraped off portion A liquid rotating chamber 20 is provided.
[0025]
【The invention's effect】
According to the present invention, the front half of the screw body is formed in a substantially hemispherical shape, and a plurality of spiral grooves are formed on the outer peripheral surface of the screw body, whereby the liquid fed into the liquid rotating chamber from the spiral groove Therefore, the rotational force applied to the spiral groove is released from the ejection hole without being reduced, and a good spray state can be obtained.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a distal end portion of an endoscope spray tool according to a reference example of the present invention.
2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a front view of a single screw body according to a reference example of the present invention.
4 is a side sectional view of a distal portion of the endoscopic spray instrument implementation of the present invention.
FIG. 5 is a side cross-sectional view of a distal end portion of a conventional endoscope spray tool.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tip nozzle 2 Liquid feeding pipe 10 Ejection hole 11 Nozzle body 12 Tip cap 14 Screw body 15 Spiral groove 20 Liquid rotation chamber

Claims (1)

Screw body spiral groove for rotating the liquid sent from the rear around the axis is formed through a liquid feed pipe is disposed within the distal end cap ejection hole in a central portion of the tip wall is formed In an endoscope sprayer,
The tip end surface of the screw body is formed in a planar shape obtained by cutting a tip portion of a hemispherical surface in which a plurality of spiral grooves are formed on the outer peripheral surface in a direction substantially perpendicular to the axis, and the tip cap The inner wall surface is formed in a hemispherical shape into which the hemispherical surface of the screw body is fitted,
The spraying tool for an endoscope , wherein the cut portion of the screw body is a liquid rotation chamber for rotating the liquid that has passed through the screw body .

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