JP2011015774A - Distal end part of forward view type endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distal end part of a forward view type endoscope in which a nozzle head part can be configured in a small size, and which can be accurately bent without any variation by individuals by turning a fluid jetting direction toward an observation window.SOLUTION: A flow path hole 6 includes a nozzle insertion hole part 6A on the distal end side, to which a fluid jetting nozzle 10 is inserted and fixed, and a communication hole part 6B straightly communicated to the fluid jetting nozzle 10 from the rear side. The nozzle insertion hole part 6A is formed in a non-circular cross-sectional shape in which the extension area P of a part near the observation window 3 of the communication hole part 6B is closed. The fluid jetting nozzle 10 is formed in such a cross-sectional shape that it is fitted to the nozzle insertion hole part 6A without any play so as not to be rotated inside the nozzle insertion hole part 6A, and is fixed to a distal end part body 2.

Description

  The present invention relates to a distal end portion of a front-view endoscope.

  In a front-view endoscope, an observation window is generally placed forward on the distal end surface of the distal end main body that forms the most distal portion of the insertion portion, and adheres to the observation window during endoscopic examination. A fluid ejection nozzle for ejecting water or air is disposed on the distal end surface of the distal end portion body so as to be ejected toward the surface of the observation window.

  The head of such a fluid ejection nozzle (hereinafter referred to as “nozzle head”) needs to be configured so that the ejection direction of water or air can be accurately bent toward the surface of the observation window. However, there are many cases where sufficient cleaning ability cannot be obtained unless they are provided close to each other.

  However, if the head of the fluid ejection nozzle is large and close to the observation window, that part enters the observation screen and obstructs the field of view, and the illumination light is reflected to the observation window even outside the observation screen. As a result, flare, ghost, etc. may occur and the observed image may be deteriorated. Therefore, it is desirable to make the head of the fluid ejection nozzle as small as possible.

  Such a fluid ejection nozzle includes a connection base portion that is inserted and connected to a flow path hole of the tip portion main body, and a nozzle head portion that protrudes from the tip surface of the tip portion main body. It has been a subject to be able to be configured and to be able to accurately bend the fluid ejection direction toward the observation window.

  Therefore, in a conventional front-view endoscope, a fluid passage that is eccentric with respect to the central axis is formed in the connection base portion of the fluid ejection nozzle, and the nozzle head that protrudes from the tip surface of the tip portion main body has a connection base portion. The fluid ejection nozzle has been downsized by adopting a configuration in which the jet outlet is formed with its direction aligned with the thick side (for example, Patent Document 1).

JP2000-83890

  However, in the invention described in Patent Document 1, in the manufacturing process, when the connection base portion of the fluid ejection nozzle is inserted into the flow passage hole of the tip body, the fluid ejection nozzle is freely moved around the axis of the connection base portion in that state. Rotate.

  For this reason, the direction of the spout is directed toward the observation window with the operator's control, and then the fluid ejection nozzle is fixed to the tip body by welding or the like. The direction of the spout varies, and the observation window In some cases, there was a variation in the cleaning ability.

  An object of the present invention is to provide a distal end portion of a front-view endoscope in which a nozzle head can be configured in a small size, and can be accurately bent without causing variation due to an individual toward a viewing window. With the goal.

  In order to achieve the above object, the distal end portion of the front-view endoscope of the present invention has an observation window disposed forwardly on the distal end surface of the distal end portion main body constituting the most distal portion of the insertion portion, The fluid ejection nozzle is inserted from the front end of the flow path hole formed in the front end portion in the front-rear direction and fixed thereto, and the fluid passing through the flow path hole is transferred from the fluid ejection nozzle to the surface of the observation window. In the distal end portion of the front-view endoscope configured to be ejected toward the front end, the flow path hole includes a nozzle insertion hole portion on the distal end side where the fluid ejection nozzle is inserted and fixed, and the fluid ejection nozzle The nozzle insertion hole is formed in a non-circular cross-sectional shape in which the extension region of the communication hole near the observation window is closed. The nozzle should not be rotated in the nozzle insertion hole. It is formed in a sectional shape to be fitted without rattling into Le insertion hole, in which is fixed to the distal end body.

  In addition, the cross-sectional shape of the inner wall of the nozzle insertion hole may be formed in a substantially D shape, and the flat portion of the inner wall may be directed in the direction in which the observation window is located. The fluid ejection nozzle has a C-shaped wall having a substantially C-shaped cross section in which the connection base inserted into the nozzle insertion hole is inscribed in the arc-shaped portion of the inner wall of the nozzle insertion hole. A nozzle head that protrudes from the distal end surface of the main body may be formed with a jet opening that opens in the direction in which the observation window is located.

  The spout may be formed by directly extending the wall deficient portion of the C-shaped wall of the connection base, and the cross-sectional shape of the inner wall of the communication hole portion of the flow path hole is circular, The extension line of the central axis line may coincide with the central axis line of the arc of the arcuate portion of the inner wall of the nozzle insertion hole.

  Further, the nozzle head may include a roof portion having a circular cross-sectional shape obtained by extending the outer periphery of the C-shaped wall of the connection base in a circular shape, or the nozzle head may have a C-shaped wall of the connection base. You may provide the roof part which encloses the spout formed by extending the wall defect | deletion part of this as it is in a rectangular shape.

  According to the present invention, the nozzle insertion hole is formed in a non-circular cross-sectional shape in which the extended region of the communication hole near the observation window is closed, and the fluid ejection nozzle rotates within the nozzle insertion hole. It is formed in a cross-sectional shape that fits in the nozzle insertion hole without rattling, and is fixed to the tip body, so that the nozzle head can be made compact and fluid It can be bent accurately with no variation due to the individual, with the direction of jetting toward the observation window.

1 is a partially enlarged side cross-sectional view of a distal end of an insertion portion of a front-view endoscope according to a first embodiment of the present invention. 1 is a perspective view of the vicinity of a distal end of an insertion portion of a front-view endoscope according to a first embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1 of the front-view endoscope according to the first embodiment of the present invention. 1 is a perspective view of a fluid ejection nozzle of a front-view endoscope according to a first embodiment of the present invention. FIG. 5 is a cross-sectional view taken along the line VV in FIG. 1 of the front-view endoscope according to the first embodiment of the present invention. It is a perspective view of the fluid ejection nozzle of the front-viewing endoscope according to the second embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 2 shows the distal end portion of the insertion portion 1 of the front-view endoscope according to the first embodiment of the present invention. An observation window 3 is disposed on the distal end surface 2a of the distal end portion main body 2 that is connected and disposed at the forefront of the insertion portion 1, so that the front of the distal end portion main body 2 can be observed. On the distal end surface 2 a of the distal end main body 2, an illumination window 4, a treatment instrument protruding port 5, and the like are also arranged side by side with the observation window 3.

  Further, a fluid ejection nozzle 10 for ejecting water or / and air to the distal end surface 2a of the distal end portion main body 2 so that mucus or the like adhering to the observation window 3 can be washed away during the endoscopic examination. However, it is arranged so as to protrude toward the surface of the observation window 3 with the jet port facing.

  FIG. 1 shows the tip of such a front-view endoscope. 3 is the above-mentioned observation window. A channel hole 6 through which water and air pass is formed in the distal end portion body 2 so as to penetrate straight in the front-rear direction (vertical direction in FIG. 1).

  The flow path hole 6 communicates straight with the fluid ejection nozzle 10 from the rear side to the nozzle insertion hole 6A on the distal end side where the fluid ejection nozzle 10 is inserted and fixed from the distal end surface 2a side of the distal end body 2. From the communication hole portion 6B and the pipe connection hole portion 6C in which the distal end portion of the pipe 7 for air supply and / or water supply inserted and arranged in the insertion portion 1 is connected and fixed at the rear position of the communication hole portion 6B. It has become.

  Both the communication hole 6B and the pipe connection hole 6C have circular inner wall cross-sectional shapes, and the positions of the central axes of both of them match. X is the common central axis. However, the configuration on the pipe connection hole 6C side may be in any form.

  The nozzle insertion hole 6A is formed in a non-circular cross-sectional shape in which the extension region P in front of the portion near the observation window 3 of the communication hole 6B is closed without being drilled. Hereinafter, this region is referred to as “P region”. Specifically, as shown in FIG. 3 illustrating the III-III cross section, the cross-sectional shape of the inner wall of the nozzle insertion hole 6A is formed in a substantially D shape.

  As shown in FIGS. 3 and 1, the center axis of the arc of the arc-shaped portion of the inner wall of the nozzle insertion hole 6A coincides with the extended line of the center axis X of the communication hole 6B. A flat portion (that is, a flat wall facing the P region) 6a of the inner wall of the nozzle insertion hole 6A having a substantially D-shaped cross section is directed in the direction in which the observation window 3 is positioned.

  The fluid ejection nozzle 10 includes a connection base 11 that is inserted into the nozzle insertion hole 6A and a nozzle head 12 that protrudes from the front end surface 2a of the front end main body 2. As shown in FIG. And the nozzle head portion 12 are formed by processing a single cylindrical material whose end surface on the head side is closed.

  Specifically, as shown in FIG. 3, the connection base 11 is composed of only a C-shaped wall having a substantially C-shaped cross section inscribed in the arc-shaped portion of the inner wall of the nozzle insertion hole 6A. It fits in the nozzle insertion hole 6A without rattling so that it cannot rotate in the insertion hole 6A, and is fixed to the tip end body 2 by being bonded or welded thereto. Therefore, the mounting direction of the fluid ejection nozzle 10 with respect to the distal end portion body 2 is uniquely determined by the parts.

  As described above, the center axis of the arc of the arc-shaped portion of the inner wall of the nozzle insertion hole 6A coincides with the extension of the center axis X of the communication hole 6B, and the axis of the fluid ejection nozzle 10 is also It is consistent with it. Further, the central axis of the C-shaped wall of the connection base 11 (that is, the central axis of the arc-shaped portion) also coincides with it.

As shown in FIG. 1 and FIG. 5 illustrating the VV cross section, the nozzle head 12 is formed with a jet 13 that opens in the direction in which the observation window 3 is located. As shown in FIG. 4, the spout 13 of this embodiment is formed by extending a wall deficient portion of the C-shaped wall of the connection base 11 toward the nozzle head 12 as it is.

  The outer shape of the nozzle head portion 12 is a cylindrical material as it is, and includes a roof portion 14 having a circular cross-sectional shape obtained by extending the outer circumference of the arc-shaped portion of the connection base portion 11 in a circular shape. Therefore, the fluid ejection nozzle 10 of this embodiment can be configured to be extremely small without the nozzle head 12 protruding greatly.

  The spout 13 is located at the front position of the P region on the distal end surface 2 a of the distal end main body 2, and the water channel is bent at a substantially right angle toward the surface of the observation window 3 at that portion. As a result, the water or air sent through the pipe 7 changes its direction at the nozzle head 12 through the connection base 11 from the communication hole 6B of the flow path hole 6 and from the jet port 13 to the observation window 3. It is ejected toward the surface.

  In the assembling process for attaching the fluid ejection nozzle 10 to the tip body 2, it is not necessary to adjust the direction of attachment of the fluid ejection nozzle 10 to the tip body 2, and the connection base 11 of the fluid ejection nozzle 10 is flowed through the connection base 11. If the nozzle 6 is inserted into the nozzle insertion hole 6 </ b> A of the hole 6, the ejection port 13 of the fluid ejection nozzle 10 is set without variation in a state where the ejection port 13 is correctly directed to the observation window 3. Therefore, it is possible to accurately bend the direction of water and air ejection toward the observation window 3 without variation among individuals.

  FIG. 6 shows a fluid ejection nozzle 10 according to a second embodiment of the present invention, in which the roof portion 14 of the nozzle head portion 12 is formed by extending a wall deficient portion of the C-shaped wall of the connection base portion 11. The spout 13 formed in a rectangular shape is formed.

  With this configuration, the nozzle head 12 is slightly larger than in the first embodiment, but the flow of water and air ejected from the ejection port 13 is controlled to be more stable toward the surface of the observation window 3. Therefore, there is a merit that fine dust or the like is not easily clogged in the corners, and cleaning is easy even if clogged.

DESCRIPTION OF SYMBOLS 1 Insertion part 2 Tip part main body 2a Tip surface 3 Observation window 3
6 channel hole 6a plane part 6A nozzle insertion hole part 6B communication hole part 10 fluid ejection nozzle 11 connection base part 12 nozzle head part 13 outlet 14 roof part P It is an extension area of the part near the observation window of the communication hole part. Unperforated area X Central axis

Claims (7)

An observation window is disposed forward on the distal end surface of the distal end main body constituting the most distal portion of the insertion portion, and the fluid ejection nozzle is formed at the distal end of the flow path hole formed through the distal end main body in the front-rear direction. A forward-viewing endoscope configured to be inserted into a portion from the front and fixed thereto, and fluid that has passed through the flow path hole is ejected from the fluid ejection nozzle toward the surface of the observation window. At the tip,
The flow path hole is provided with a nozzle insertion hole portion on the front end side where the fluid ejection nozzle is inserted and fixed, and a communication hole portion that communicates straight from the rear side to the fluid ejection nozzle,
The nozzle insertion hole is formed in a non-circular cross-sectional shape in which an extension region of the communication hole near the observation window is closed,
The fluid ejection nozzle is formed in a cross-sectional shape that is fitted in the nozzle insertion hole without rattling so that it cannot rotate in the nozzle insertion hole, and is fixed to the tip body. A distal end portion of the forward-viewing endoscope as a feature.   The front-viewing endoscope according to claim 1, wherein a cross-sectional shape of an inner wall of the nozzle insertion hole is formed in a substantially D shape, and a flat portion of the inner wall is directed in a direction in which the observation window is positioned. The tip of the.   The fluid ejection nozzle has a C-shaped wall having a substantially C-shaped cross section in which a connection base portion inserted into the nozzle insertion hole portion is inscribed in an arc-shaped portion of the inner wall of the nozzle insertion hole portion, The front-end | tip part of the front-view-type endoscope of Claim 2 in which the nozzle head which protrudes toward the direction where the said observation window is located is formed in the nozzle head part which protrudes from the front end surface of a front-end | tip part main body.   The front-end | tip part of the front-view-type endoscope of Claim 3 in which the said jet nozzle is formed as it is by extending the wall defect | deletion part of the C-shaped wall of the said connection base.   The cross-sectional shape of the inner wall of the communication hole portion of the flow path hole is formed in a circular shape, and the extension line of the central axis line coincides with the central axis line of the arc of the arc-shaped portion of the inner wall of the nozzle insertion hole portion. The front-end | tip part of the front-view-type endoscope of Claim 3 or 4.   6. The front view type interior according to claim 3, wherein the nozzle head includes a roof portion having a circular cross-sectional shape obtained by extending the outer peripheral line of the C-shaped wall of the connection base in a circular shape. The tip of the endoscope.   The forward-viewing type internal view according to claim 4 or 5, wherein the nozzle head portion includes a roof portion that rectangularly surrounds a spout formed by extending a wall defect portion of the C-shaped wall of the connection base. The tip of the mirror.

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