JPH10248792A - Hood for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform mounting to the insertion part of an endoscope in a stable state without forming special recessed and projected parts at the tip hard part of the insertion part and to prevent excessive pressure from being generated to celom inner walls and internal organs, etc., at the time of performing insertion inside a celom by forming an interval holding part to a hood main body composed of an elastic member in the state of being projected from the tip of the insertion part. SOLUTION: For this hood 40, the hood main body 41 fitted to the tip hard part 20b of the insertion part 20 and the interval holding part 42 for holding an interval to an observation object part by a tip part main body 20b are successively provided. The part of the extension line of the fluid jetting nozzle 37 of the interval holding part 42 is turned to a notch 43, an inner peripheral surface on the tip side of the hood main body 41 is separated from the tip hard part 20b and an annular passage 44 is formed between them. A gap is formed between the interval holding part 42 and the tip hard part 20b, the passage 44 is communicated to the outside through the gap and a communication path 48 whose one end is opened to a treatment tool passage 33 and other end is opened to the passage 44 is opened to the passage 44.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope hood mounted on the distal end of an insertion portion of an endoscope used for medical purposes or the like.

[0002]

2. Description of the Related Art In general, an endoscope is provided with an insertion portion inserted into a body cavity or the like connected to a main body operation portion which is operated by an operator or the like, and is connected to at least a light source device. The universal cord is pulled out, and the insertion part has a flexible part for most of the length from the part connected to the main body operation part, and an angle part and an angle part are provided at the tip of this flexible part. The distal end is provided with a distal end hard portion in sequence. The flexible part is one that bends in an arbitrary direction along an insertion path such as in a body cavity, and an illumination window, an observation window, and the like are provided in the distal end hard part. An angle portion is interposed between the distal end hard portion and the soft portion. Therefore, the angle portion can be bent in a desired direction at a desired angle by operating an angle knob attached to the main body operation portion.

[0003] This is a so-called direct-view endoscope in which an illumination window and an observation window are provided on the distal end surface of a hard distal end portion. In addition to this type of direct-view endoscope, for example, a side view provided on a side surface of a hard distal end portion is provided. There are endoscopes and the like. In a direct-viewing endoscope, the observation window is open to the distal end surface of the rigid distal end portion, and thus may adhere to the inner wall of the body cavity or the like during observation through the observation window. If the observation window comes into close contact with the inner wall of the body cavity, observation becomes impossible. In addition, a treatment tool insertion channel for inserting forceps and other treatment tools is provided in the vicinity of the illumination window and the observation window, and the treatment tool insertion channel also serves as a suction passage for sucking dirt such as body fluids. Used. Therefore, if a suction force is generated in the treatment instrument insertion channel while the distal end surface of the distal end hard portion is in close contact with the inner wall of the body cavity, the inner wall of the body cavity may be sucked.
In view of the above, a configuration in which the hood is mounted on the distal end hard portion of the insertion portion is disclosed in, for example, Jikho 54-44473.
This has been conventionally used in Japanese Patent Publication No.

FIGS. 4 and 5 show a configuration in a state in which a conventional endoscope hood is mounted near the distal end of an insertion portion. FIG. 4 shows the appearance of the distal end face of the insertion portion, and FIG. 5 is a sectional view thereof. In the figure, reference numeral 1 denotes an insertion portion, and the insertion portion 1 is provided with an angle portion 1a which can be operated to bend at the tip of a soft portion (not shown), and a tip end hard portion 1b is provided at the tip of the angle portion 1a. Are linked. A pair of illumination windows 2 and 2 and one observation window 3 are formed on the distal end surface of the distal end hard portion 1b, and a treatment tool outlet 4 through which forceps and other treatment tools are led out is opened. Fluid ejection nozzles 5 and 5 are provided on both sides of the observation window 3, and when the observation window 3 is contaminated, the cleaning liquid is ejected from these fluid ejection nozzles 5 to wash away dirt.
Next, the droplets adhering to the observation window 3 are removed by blowing pressurized air.

[0005] The illustrated endoscope is of an optical type,
For this purpose, a cover glass 6 is attached to the distal end hard portion 1b, an objective lens 7 is provided inside the cover glass 6, and an image guide 8 made of an optical fiber bundle is formed at an image forming position of the objective lens 7. Is facing the entrance end.
In recent years, a so-called electronic endoscope, in which a solid-state image pickup device such as a CCD is arranged at an image forming position of the objective lens 7 instead of the image guide 8, has been widely used. Therefore, a configuration may be adopted in which a solid-state imaging device is arranged at an image forming position of the objective lens 7 instead of the image guide 8.

[0006] The treatment tool outlet 4 is provided at the distal end hard portion 1b.
Is a treatment instrument passage 9, and a flexible tube 11 is connected to the treatment instrument passage 9 via a connection pipe 10, whereby forceps, a high-frequency treatment instrument, and other treatment instruments are connected. Is formed. Here, treatment instrument insertion channel 1
Reference numeral 2 is used not only for inserting a treatment tool but also as a suction passage for sucking body fluid and the like. In the case of a suction passage, a suction pump is connected to the proximal end of the treatment instrument insertion channel 12.

Reference numeral 13 denotes a hood. The hood 13 is a cylindrical member made of plastic, metal, or the like. The hood 13 is screwed to a screw portion 14 provided on the outer periphery of the hard tip portion 1b. And protrudes forward by a predetermined length from the distal end hard portion 1b. The hood 13 is for preventing the distal end surface of the distal end hard portion 1b from directly abutting on the inner wall of the body cavity.
The observation is made possible by separating the observation window 3 from the body cavity wall by an amount corresponding to the protrusion of the observation window 3. When the treatment instrument insertion channel 12 is used as a suction passage, the treatment instrument outlet 4 constituting the treatment instrument insertion channel 12 is separated from the body cavity wall so as to prevent suction.

When the cleaning liquid is ejected from the fluid ejecting nozzle 5 with the hood 13 attached to the hard distal end portion 1b, the hood 13 rises from the hard distal end portion 1b. Will stay. In particular, the cleaning liquid stagnates substantially in the vicinity of the inner circumference of the hood 13, so that the illumination window 2 and a part of the observation window 3 are covered with the cleaning liquid, and the amount of illumination light is reduced or a part that cannot be observed. Occurs. In order to prevent such a situation, a flow path 15 is formed in the distal end hard portion 1b in a direction orthogonal to the treatment instrument passage 9 and a circle in which the flow path 15 is opened on the outer peripheral portion of the distal end hard portion 1b. An annular concave groove 16 is formed, and four notches 17 communicating with the concave groove 16 are formed at approximately 90 degrees from the distal end surface to the outer peripheral surface of the distal end hard portion 1b. Thus, a liquid discharge path including the flow path 15, the concave groove 16, and the notch 17 is formed from the treatment instrument path 9. Therefore, if the treatment tool insertion channel 12 is set to a negative pressure when the cleaning liquid is retained in the inner peripheral portion of the hood 13, the retained cleaning liquid can be discharged from the liquid discharge path formed in this manner.

[0009]

The use of the hood 13 having such a configuration has the above-mentioned various advantages, but it does not mean that there is no problem to be solved. That is, since the hood 13 is a hard cylindrical member and is fixed by being screwed onto the outer periphery of the distal end hard portion 1b, the screw portion 14 is formed on the outer peripheral surface of the distal end hard portion 1b. There is a need to. Further, since the concave groove 16 and the notch 17 are provided as the liquid discharge path, complicated irregularities are formed on the outer peripheral surface of the distal end hard portion 1b. Therefore, there is a problem that cleaning performed after an endoscope is inserted into a patient's body to perform an inspection or the like becomes troublesome. Further, when the hood 13 is formed of a hard member, when the hood 13 is brought into contact with an inner wall of a body cavity, an organ, or the like, the insertion portion 1
If a force is applied in the direction of pressing, they may be strongly pressed.

The present invention has been made in view of the above points, and can be stably mounted on an insertion portion of an endoscope without forming any special irregularities on a hard distal end portion of the insertion portion. An object of the present invention is to provide an endoscope hood that prevents excessive pressure from being applied to an inner wall of a body cavity, an organ, or the like when inserted into the inside.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a fluid ejecting apparatus which forms at least an illumination window and an observation window on a distal end surface of a rigid distal end portion and ejects a fluid to the observation window. A nozzle is mounted, a channel capable of suction is further opened and provided, and the channel is mounted on an insertion portion connected to a communication path opened on the outer peripheral surface of the distal end hard portion, and has a substantially cylindrical shape. A hood body fitted and held on the outer peripheral surface of the hard distal end is provided with an interval holding portion projecting only a predetermined length from the distal end surface of the hard distal end. It is characterized in that a passage leading to the communication path is formed from the tip end side of the main body to the space holding portion, and a cutout is formed in a part of the space holding portion in the circumferential direction. is there.

Here, it is preferable that the portion where the notch is formed in the interval holding portion is a portion extending in the direction of the extension of the ejection portion of the fluid ejection nozzle. Thus, most of the cleaning liquid injected from the fluid injection nozzle flows out of the hood after cleaning the observation window. Then, in order to allow the hood to be mounted on the hard distal end portion so that the notch is located at a predetermined position, a hood alignment portion that is wrapped around the side opposite to the ejection port of the fluid ejection nozzle is connected to the interval holding portion. It is preferable to set up.

When the cleaning liquid or the like accumulates on the inner peripheral side of the hood, the cleaning liquid is sucked from the communication passage opening in the outer peripheral surface of the distal end hard portion in the channel, so that the gap between the outer peripheral surface of the distal end hard portion and the inner surface of the hood main body. The liquid is discharged from the passage formed in the above. Here, as the channel, the treatment instrument insertion channel and the suction channel may be combined, and a suction passage may be provided separately from the treatment instrument insertion channel. In any case, when the liquid in the hood is sucked or discharged, the passage is in a negative pressure state. One or a plurality of spacers may be provided on the inner surface of the main body or the spacing member to contact the outer peripheral surface of the hard tip portion.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. Here, in the following description, an electronic endoscope in which a solid-state imaging device is provided at the distal end of the insertion section is shown. However, it is possible to apply the present invention to an optical endoscope as in the above-described related art. Needless to say. FIG. 1 shows the distal end surface of the insertion portion.
2 is a sectional view taken along line XX of FIG. 1, and FIG. 3 is a sectional view taken along YY of FIG.

In the figure, reference numeral 20 denotes an insertion portion. Although not shown, most of the insertion portion 20 is formed of a flexible portion from the side connected to the main body operation portion. And
An angle portion 20a is connected to the flexible portion, and a hard tip portion 20b is connected to a tip portion of the angle portion 20a. An operation wire 21 is inserted through the angle portion 20a, and by pushing and pulling the operation wire 21, the distal end hard portion 20b can be directed in a desired direction.

The rigid distal end portion 20b has a distal end body 22 made of metal or the like as a structural body, and a distal end surface of the distal end main body 22 is formed of an electrically insulating plastic or the like. Are fitted and fixed.
The distal end cap 23 extends around the outer peripheral surface of the distal end main body 22, and the end surface of the distal end cap 23 is abutted against a skin layer 24 made of a synthetic resin tube extending from the angle portion 20 a side. . This prevents the metal from being exposed to the outside. Further, after the end of the outer skin layer 24 is wound, the adhesive is applied so as to swell from the wound portion to a portion near the end of the tip cap 23. It is a ridge 25.

A plurality of through holes are provided from the distal end cap 23 constituting the distal end hard portion 20b to the distal end body 22. In FIG. 1, 26 and 26 are illumination windows, 27 is an observation window, and 28 is a treatment tool outlet. In the lighting window 26,
Although not shown, an illumination lens facing the emission end of the light guide is mounted. On the other hand, an objective lens unit 29 is mounted in a through hole in the observation window 27, and a prism 30 for bending the optical path by 90 ° is bonded to the objective lens unit 29. The imaging unit 32 provided on the substrate is joined. Further, the treatment instrument outlet 28 constitutes a distal end portion of the treatment instrument passage 33, and a connection pipe 34 is inserted into the treatment instrument passage 33. This connection pipe 34
A flexible tube 35 is connected to the treatment instrument, and a treatment instrument insertion channel 36 extending from the treatment instrument outlet 28 to the tube 35 via the treatment instrument passage 33 and the connection pipe 34 is formed. Further, an observation window 2 is provided on the distal end surface of the distal end hard portion 20.
Jet nozzle 3 for jetting the cleaning fluid toward 7
7 are provided.

In the figure, reference numeral 40 denotes a hood, and the hood 40 has a hood main body 41 fitted from the distal end of the rigid distal end portion 20b of the insertion portion 20 to the distal end of the angled portion 20a. A wrap-around part inward is continuously provided at the tip of the hood main body 41, and the wrap-around part has a predetermined thickness. This serves as an interval holding unit 42 for holding the interval. Here, the interval holding portion 42 is not formed on the entire circumference of the hood main body 41, and a part thereof is a cutout 43 in which the interval holding portion 42 is missing. The position where the notch 43 is formed is at a predetermined angle in a portion in front of the fluid ejection nozzle 37 in the fluid ejection direction, preferably approximately 9
It is about 0 °. Further, the interval holding portion 42 is extended so as to wrap around on the opposite side to the ejection portion of the fluid ejection nozzle 37, and this extension portion serves as a hood alignment portion 42a indicating the mounting direction of the hood 40. I have. The hood alignment portion 42a is for confirming the direction of the hood 40 when the hood 40 is fitted to the distal end hard portion 20b of the insertion portion 20.

The hood body 41 is provided with the tip cap 2.
A portion of the connecting portion ridge 25 that constitutes a connecting portion between the base member 3 and the outer skin layer 24 extending from the angle portion 20a side to the distal end hard portion 20b side is in close contact with the outer skin layer 24, The inner peripheral surface on the side is separated from the distal end hard portion 20b, and the outer peripheral surface bulges outward, and an annular passage 44 is formed therebetween. Most of the space holding portion 42 is not in contact with the tip cap 23, so that a substantially arc-shaped gap 45 is formed therebetween, and the passage 44 communicates with the outside through the gap 45. doing. In addition, in order to maintain the gap between the gap holding section 42 and the tip cap 23, three spacer sections 46 are provided at predetermined intervals on the inner surface side of the gap holding section 42, The part 46 is in contact with the tip cap 23. Here, the width of each spacer portion 46 may be the same, but as shown in the figure, it is possible to make the width of one other portion wider than that of the two portions near the notch 43. it can. The hood main body 41 partially abuts on the tip cap 41 at the notch 43, but a cavity 47 is formed in the middle of the hood main body 41, and a passage 44 is formed through the cavity 47. Is open to the outside. Further, a communication path 48 is provided between the distal end cap 23 and the distal end body 22, one end of which opens into the treatment instrument passage 33 constituting the treatment instrument insertion channel 36, and the other end of which opens into the passage 44. . Thus, the gap 45 and the cavity 47, the passage 45, and the communication passage 48 constitute a path for collecting the liquid remaining on the inner surface side of the hood 40 into the treatment instrument insertion channel 36.

Here, since the hood 40 has elasticity, the inner diameter of the hood 40 is set to the angle portion 20a of the insertion portion 20.
The hood 40 is prevented from coming off by pushing the hood 40 to a position beyond the position of the connecting projection 25 by making the outer diameter of the hood 40 slightly smaller than the outer diameter of the hood 40.
Further, in order to more securely fix the hood 40, particularly a portion on the base end side, a medical adhesive tape 49 used for an operation or the like is wound. Thereby, the hood 40 is almost completely fixed to the insertion portion 20. Further, if the hood 40 is pulled out from the insertion portion 20 by peeling the adhesive tape 49, the hood 40 can be detached therefrom.

As described above, by attaching the hood 40 to the insertion portion 20, the illumination window 26, the observation window 27, the treatment tool outlet 28, and the fluid ejection nozzle 37 are provided at the distal end portion of the insertion portion 20. The gap holding section 42 is formed at a position avoiding the part where the gap has been formed, and the gap holding section 42 is the foremost portion. Therefore, when the hood 40 is inserted into the body cavity and the inspection / observation is performed with the hood 40 attached to the insertion portion 20, even if the distal end of the insertion portion 20 abuts on the inner wall of the body cavity, the hood 40 does not directly abut. Since the illumination window 26 and the observation window 27 do not come into contact with the body cavity, at least observation is possible. Further, when the body fluid or the like stays in the body cavity, it obstructs the observation or the like, so that the body fluid or the like is removed by suction. For this purpose, the treatment instrument insertion channel 36 is used as a suction passage. For this purpose, the inside of the treatment instrument insertion channel 36 is set to a negative pressure. At this time, if the tip of the insertion portion 20 is in contact with the inner wall of the body cavity,
Although the inner wall of the body cavity may be sucked into the treatment instrument outlet 28, like the illumination window 26 and the observation window 27 described above,
Since the treatment instrument outlet 28 does not directly contact the inner wall of the body cavity, suction force does not act on the inner wall of the body cavity.

During the examination in the body cavity, the observation window 27 is contaminated with body fluid or the like, and the observation field of view is deteriorated. For this purpose, in order to remove contaminants from the observation window 27, a cleaning liquid, usually cleaning water, is ejected from the fluid ejection nozzle 37 toward the observation window 27, and then pressurized air is ejected. After the washing liquid ejected from the washing window 27 is washed away, the washing liquid is ejected from the portion of the notch 43 to the outside by the pressure. Therefore, hood 4
The cleaning liquid can be prevented from staying at the tip of the insertion section 20 surrounded by the zero interval holding section 42.

Of course, the hood 4 is
As long as the zero spacing member 42 protrudes, the cleaning liquid or other liquid stays between the inner surface of the spacing member 42 and the tip cap 23, and the liquid causes the whole or a part of the illumination window 26 or the like to remain. May be covered. In such a state, the treatment instrument insertion channel 36 is set to a negative pressure.
Thus, the liquid staying on the inner surface side of the hood 40 in the treatment instrument insertion channel 36 can be recovered from the gap 45 and the space 47 via the passage 45 and the communication passage 48 sequentially. In addition, since the spacer portion 46 is formed in the interval holding portion 42, even if a negative pressure is applied to the portion of the gap 45, there is no possibility that the gap 45 will be closed.

The hood 40 is fixed to the insertion portion 20 by the elastic force of the hood 40 without using special screws or the like. Further, a liquid discharge path for collecting the liquid remaining on the inner surface side of the hood 40 into the treatment instrument insertion channel 36 is as follows:
It is necessary to provide a mechanism for fixing the hood 40 and a liquid discharge path on the side of the hood 40, such as the gap 45 and the void 47, the passage 45, and the communication passage 48. Absent. Therefore, as long as the outer diameter of the insertion portion and the inner diameter of the hood have a predetermined dimensional relationship, the hood 40
Can be attached, and the hood can have versatility.
In addition, after inspecting the inside of the body cavity with the hood 40 attached, the hood 40 is removed, and the entire endoscope is removed.
When the hood 40 is reused, the hood 40
Although it is necessary to clean and disinfect the endoscope, cleaning of the endoscope is facilitated by the absence of the hood mounting unevenness in the insertion portion.

Further, the hood 40 is formed of an elastic member, and the hood main body 41 extends to a position beyond the connecting ridge 25 formed at the connecting portion between the angle portion 20a and the hard distal end portion 20b in the insertion portion 20. Since the hood 40 is extended, the inner diameter of the hood 40 is approximately the same as the outer diameter of the distal end hard portion 20b. Retained and will not fall off during inspection. Also,
Since the adhesive tape 49 is wound around the base end of the hood 40, there is no fear that the base end is turned up. Moreover, the adhesive tape 49 is peeled off, and the hood 40 is inserted into the insertion section 2.
The hood 40 can be easily separated at the time of cleaning, disinfection, or the like, because the hood 40 can be separated from the insertion portion 20 only by pulling the hood 40 out of zero. Further, since the hood 40 is formed of an elastic member, even if the insertion portion 20 is moved in the body cavity, the hood 40 elastically abuts against the inner wall of the body cavity, the organ, and the like. There is no danger of pressure.

[0026]

Since the present invention is constructed as described above, the observation window and the suction passage can be separated from the inner wall of the body cavity by a predetermined distance without forming any particular irregularities on the hard end portion of the insertion portion. In addition, when an operation is performed by inserting it into a body cavity or the like, there is an effect that an excessive pressing force does not act on an inner wall of a body cavity, an organ, or the like.

[Brief description of the drawings]

FIG. 1 is an external view showing a distal end surface of an insertion section of an endoscope equipped with a hood according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view taken along line YY of FIG. 1;

FIG. 4 is an external view showing a distal end surface of an insertion portion of an endoscope equipped with a hood according to a conventional technique.

FIG. 5 is a sectional view taken along the line ZZ of FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 20 Insert part 20a Angle part 20b Tip hard part 22 Tip main body 23 Tip cap 25 Connecting ridge 26 Illumination window 27 Observation window 28 Treatment tool outlet 33 Treatment tool passage 36 Treatment tool insertion channel 34 Fluid injection nozzle 40 Food 41 Hood Main body 42 Spacing holding part 42a Hood positioning part 43 Notch 44 Passage 45 Gap 46 Spacer part 47 Empty space 48 Communication passage 49 Adhesive tape

Claims (5)

[Claims] At least an illumination window and an observation window are formed on a distal end surface of a rigid distal end portion, a fluid ejection nozzle for ejecting a fluid is mounted on the observation window, and a channel capable of suction is provided with an opening. In addition, in the endoscope hood, which is attached to an insertion portion in which this channel is connected to a communication path that opens to the outer peripheral surface of the distal end hard portion, the hood is formed of a substantially cylindrical elastic member and fits on the outer peripheral surface of the distal end hard portion. An interval holding portion that protrudes by a predetermined length from the distal end surface of the distal end hard portion is continuously provided to the hood main body to be joined and held, and the communication passage extends from the distal end side of the hood main body to a portion of the interval holding portion. A hood for an endoscope, wherein a passage leading to the space is formed, and a cutout is formed in a part of the space holding portion in a circumferential direction. 2. A hood for an endoscope according to claim 1, wherein the notch of said space holding section is formed in a portion extending in a direction of an extension of said ejection section of said fluid ejection nozzle. 3. The endoscope for an endoscope according to claim 2, wherein a hood position adjusting portion that goes around on the side opposite to the ejection portion of the fluid ejection nozzle is connected to the space holding portion. hood. 4. A structure in which one or a plurality of spacers are provided on the inner surface of the hood main body or the interval holding portion at a portion where the passage is formed, the spacer being in contact with the outer peripheral surface of the distal end hard portion. The hood for an endoscope according to claim 1, wherein 5. The endoscope according to claim 1, wherein the hood main body is configured to be fixed by winding a medical adhesive tape at a position closer to a base end than a portion where the passage is formed. For hood.