JP2006167242A - Water supply device for endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water supply device for an endoscope which easily switches to supply water between to an observation window and to an observation field of view only by inserting one water supply tube in an insertion portion. <P>SOLUTION: A water supply nozzle 10 comprises a cylinder body 11 and a piston body 12. A head part 11a of the cylinder body 11 has a lateral nozzle 13 opening to the surface of the observation window 3 on the side and a front nozzle 14 opening in the direction of the observation field of view in the front. The piston body 12 has an elastic deformation part 16 elastically deformed into a crushed state when a pressure for supplying water increases, a lateral communication opening 17 which is closed normally and communicates with the lateral nozzle 13 when the piston body 12 moves by the elastic deformation of the elastic deformation part 16, and a front communication opening 18 which communicates with the front nozzle 14 normally and is blocked by the elastic deformation of the elastic deformation part 16. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an endoscope water supply device.

  Endoscope for gastrointestinal examination because it becomes impossible to perform good endoscopic observation if mucus or filth in the body adheres to the surface of the observation window placed at the tip of the insertion part of the endoscope Is provided with a water supply nozzle for spraying cleaning water toward the surface of the observation window.

In addition, in endoscopes for inspection of the large intestine, stool or the like may adhere to the mucosal surface to be inspected, and the portion may not be endoscopically observed. The 2nd water supply nozzle for spraying is attached to the front-end | tip of the insertion part (for example, patent document 1, 2).
JP-A-8-238214 JP 2001-37709 A

  However, in the conventional endoscope water supply device as described above, two water supply tubes, the water supply tube for cleaning the observation window and the auxiliary water supply tube for cleaning the subject, are inserted and arranged over the entire length of the insertion portion. Therefore, there is a drawback that the entire insertion portion becomes thick and the pain given to a person who undergoes endoscopy is increased.

  Therefore, the present invention provides an endoscope water supply device that can easily switch between water supply toward the observation window and water supply toward the observation visual field simply by inserting a single water supply tube into the insertion portion. For the purpose.

  In order to achieve the above object, an endoscope water supply device according to the present invention is an endoscope water supply device in which a water supply nozzle is arranged at the distal end of an insertion portion in communication with a water supply tube inserted and arranged in the insertion portion. The water supply nozzle is composed of a cylinder body whose head protrudes from the tip of the insertion portion, and a piston body that is formed with a pressure receiving surface that receives the water supply pressure from the water supply tube and is freely movable in the axial direction within the cylinder body. Then, a side nozzle that opens toward the surface of the side observation window and a front nozzle that opens toward the front observation field are formed on the head of the cylinder body. Is an elastically deformable portion that is elastically deformed into a crushed state when the water supply pressure increases, and is usually closed by the inner wall surface of the cylinder body at a position closer to the base than the elastically deformable portion, To deformation When the piston body moves more than a certain amount forward, the side communication hole that communicates with the side nozzles of the cylinder body and the amount of deformation of the elastically deforming portion that normally communicates with the front nozzle of the cylinder body If it exceeds, it forms a front communication hole that is closed by the deformation.

  Even though the through hole is formed straight at the axial position of the piston, the surface surrounding the through hole on the bottom surface of the piston body is a pressure receiving surface, and the tip opening portion of the through hole is a front opening. Good.

  Moreover, the piston body may be formed as one part by an elastic member, and the elastic deformation part may be formed thinner than the other part.

  According to the present invention, when a water supply operation is performed at a water supply pressure below a certain level, the side communication hole of the piston body is kept closed by the inner wall surface of the cylinder body, and the front nozzle of the cylinder body is moved forward. When the water supply operation is performed at a high pressure exceeding a certain water supply pressure, the elastic deformation part of the piston body is elastically deformed by the pressure, and the piston body moves forward in the cylinder body. By doing so, the front communication hole of the piston body is closed by the elastic deformation portion, the side communication hole communicates with the side nozzle of the cylinder body, and only water feeding from the side nozzle of the cylinder body toward the surface of the observation window is performed. Therefore, just by inserting and arranging a single water supply tube in the insertion part, water supply toward the observation window and water supply toward the observation visual field can be easily switched, and the diameter of the insertion part is made narrow. , Inside It is possible to reduce the pain a person is subjected to receive the mirror inspection.

  The water supply nozzle is composed of a cylinder body whose head protrudes from the tip of the insertion portion, and a piston body that is formed with a pressure receiving surface that receives the water supply pressure from the water supply tube and that can be moved back and forth in the axial direction within the cylinder body. In the head of the cylinder body, a side nozzle that opens toward the surface of the side observation window and a front nozzle that opens toward the front observation field are formed. An elastically deforming portion that elastically deforms into a crushed state when the water supply pressure increases, and an elastic deformation portion of the elastically deforming portion that is usually closed by the inner wall surface of the cylinder body at a position closer to the base than the elastic deforming portion When the piston body moves more than a certain distance forward, the side communication hole that communicates with the side nozzle of the cylinder body and the amount of deformation of the elastically deforming part that is normally in communication with the front nozzle of the cylinder body is constant. The excess to form a front communication hole in a state of being closed by the deformation.

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 2, reference numeral 1 denotes an insertion portion of an endoscope covered with a flexible tube, and an observation window 3 and an illumination window (not shown) are provided on the distal end surface of the distal end main body 2 connected to the distal end. Is arranged.

  The imaging surface of the solid-state imaging device 5 is arranged at the projection position of the subject by the objective optical system 4 arranged on the back side of the observation window 3, and an image of the subject in the observation field in front of the tip body 2 is taken. It can be observed with a monitor television (not shown).

  A single water supply tube 6 made of, for example, a tetrafluoroethylene resin tube or the like is inserted through the entire length of the insertion portion 1, and the tip thereof is connected and fixed to the rear end portion of the tip portion main body 2.

  Reference numeral 10 denotes a water supply nozzle that communicates with the water supply tube 6 and is disposed at the tip of the tip end body 2 in order to eject water that has been sent through the water supply tube 6 to the outside. The head 11a is composed of a cylinder body 11 that protrudes forward from the tip surface of the tip body 2 and a piston body 12 that is disposed in the cylinder body 11 so as to be movable back and forth in the axial direction.

  The cylinder body 11 is formed of, for example, a stainless steel pipe or the like. The head 11a of the cylinder body 11 has a side nozzle 13 that opens toward the surface of the observation window 3 on the side thereof, and a front observation field of view. A front nozzle 14 that opens in the direction is formed. The portions other than the head portion 11 a of the cylinder body 11 are formed in a bottomless cylindrical shape and are embedded in the distal end portion main body 2.

  The piston body 12 is formed of an elastic synthetic resin material, rubber material, or the like, and a through hole 15 is formed straight at the axial position, and a surface surrounding the through hole 15 on the bottom surface of the piston body 12 is a water supply. It is a pressure receiving surface 19 that receives the water supply pressure from the tube 6.

  In the vicinity of the tip of the piston body 12, there is an elastic deformation portion 16 that is elastically deformed into a crushed state by being pressed against the inner surface of the head 11 a of the cylinder body 11 from the rear when the water supply pressure from the water supply tube 6 increases. Is formed.

  In this embodiment, the elastic deformation portion 16 is formed thinner than the other portions, and the entire piston body 12 is formed as a single component. However, the piston body 12 may be composed of a plurality of parts, such as forming only the elastically deforming portion 16 with an elastic member and joining it to other portions.

  The piston body 12 is formed with a side communication hole 17 corresponding to the side nozzle 13 of the cylinder body 11 and a front communication hole 18 corresponding to the front nozzle 14. A communication hole 18 is formed.

  The side communication hole 17 is normally in close contact with the inner wall surface of the cylinder body 11 at a position closer to the base than the elastic deformation portion 16, and as shown in FIG. When the piston body 12 is moved forward by a certain amount by elastically deforming 16, the side communication holes 17 are in communication with the side nozzles 13.

  On the other hand, as shown in FIG. 2, the front communication hole 18 normally communicates straight with the front nozzle 14 of the cylinder body 11, and as shown in FIG. 1, the deformation amount of the elastic deformation portion 16 is a constant amount. If it exceeds, it will be in the state obstruct | occluded by the deformation | transformation.

  When the water feeding operation of the endoscope water feeding device of the embodiment configured as described above is performed from the proximal end side through the water feeding tube 6 at a water feeding pressure below a certain level, as shown in FIG. The direction communication hole 17 is closed and the front communication hole 18 is maintained in communication with the front nozzle 14, and only water feeding from the front nozzle 14 toward the front observation visual field direction is performed.

  When a water supply operation is performed at a high pressure exceeding a certain water supply pressure, the elastic deformation portion 16 is elastically deformed by the pressure and the piston body 12 moves forward in the cylinder body 11 as shown in FIG. As a result, the front communication hole 18 is closed by the elastic deformation portion 16, and the side communication hole 17 and the side nozzle 13 communicate with each other, so that only water feeding from the side nozzle 13 toward the surface of the observation window 3 is performed. Is called.

  In this way, in the present invention, the water supply state to the surface of the observation window 3 and the water supply state in the observation visual field direction can be easily switched only by inserting and arranging the single water supply tube 6 in the insertion portion 1. be able to.

It is side surface sectional drawing of the state in which water supply to the observation window surface direction is performed in the water supply apparatus of the endoscope of the Example of this invention. It is side surface sectional drawing of the state in which the water supply to an observation visual field direction is performed in the water supply apparatus of the endoscope of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insertion part 2 Front-end | tip part body 3 Observation window 6 Water supply tube 10 Water supply nozzle 11 Cylinder body 11a Head 12 Piston body 13 Side nozzle 14 Front nozzle 15 Through-hole 16 Elastic deformation part 17 Side communication hole 18 Front communication hole 19 Pressure receiving surface

Claims (3)

In the endoscope water supply apparatus in which a water supply nozzle is arranged at the tip of the insertion part in communication with a water supply tube inserted and arranged in the insertion part,
A piston body in which the water supply nozzle has a cylinder body whose head projects from the tip of the insertion portion and a pressure receiving surface that receives the water supply pressure from the water supply tube, and is disposed so as to be movable forward and backward in the axial direction within the cylinder body. And consist of
Formed on the head of the cylinder body is a side nozzle that opens toward the surface of the side observation window, and a front nozzle that opens toward the direction of the front observation field,
The piston body is usually blocked by an inner wall surface of the cylinder body at an elastic deformation portion that is elastically deformed into a crushed state when the water supply pressure increases, and at a position closer to the base than the elastic deformation portion. And a side communication hole that communicates with the side nozzle of the cylinder body when the piston body moves forward by a predetermined amount or more due to elastic deformation of the elastic deformation portion, and normally communicates with the front nozzle of the cylinder body. An endoscope water-feeding device, comprising: a front communication hole that is closed when the amount of deformation of the elastic deformation portion exceeds a certain amount. A through hole is formed straight at the axial position of the piston, and a surface surrounding the through hole on the bottom surface of the piston body is the pressure receiving surface, and a front end opening portion of the through hole is the front opening. The endoscope water supply device according to claim 1.   The water supply device for an endoscope according to claim 1 or 2, wherein the piston body is formed as a single part by an elastic member, and the elastic deformation portion is formed thinner than other portions.

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