JP2000079086A - Hood for endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate insertion of an endoscope in examining a digestive canal by air-tightly holding an annular space formed surrounding the outer peripheral surface of the tip of an endoscope, the inner peripheral surface of an outer cylinder, and the rear end face of a slide hood, and providing a small hole in the rear end of the annular space to be connected to a passage for a fluid previously provided on the endoscope. SOLUTION: A slide hood 2 having a rib on the outer periphery of the rear end part is installed on the outer peripheral surface of an distal end of an endoscope 7 formed cylindrical, an outer cylinder 3 having a rib inside the distal end is put on the slide hood 2, and the rear end thereof is integrated with the distal end of the endoscope 7. A seal ring 4 is provided on the rear end of the slide hood 2, and an air-tight annular space 11 clamped between the outer cylinder 3 and the distal end of the endoscope 7 is formed in the rear of the seal ring. A tube 6 previously provided on the endoscope 7 is connected to the rear end of the annular space 11 to feed a fluid, and a syringe 10 and a connector 8 for inserting a fluid are attached to the rear end. preferably, the connector 8 is provided with a one-way valve for preventing air leakage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assisting device for inserting an endoscope, examining a digestive tract, or resecting a tissue in a body cavity such as a tumor.
The present invention relates to an endoscope hood that can perform safe and accurate treatment.

[0002]

2. Description of the Related Art Reliable and quick detection of a lesion site in an endoscopic examination of the digestive tract is to perform a subsequent treatment accurately and promptly, thereby reducing the pain of a patient and the mental burden of a physician. And is extremely important in shortening the treatment time. From such a viewpoint, a hood to be attached to the distal end of the endoscope has been developed. The advantage of using this hood is that the hood prevents the mucous membrane from coming into direct contact with the lens of the endoscope and ensures a good field of view. It is possible to reduce the pain of the patient, and, as shown in FIG. 3, a hood is pressed against a lesion site hidden behind a bent portion or a fold of a digestive tract or a tangential direction, and a frontal view is obtained. And subsequent observation and treatment are easy.

However, when the effective length of the hood is long, there are cases where insertion is difficult. For example, in colonoscopy, S
If the insertion is continued with the hood attached at a bent portion such as the sigmoid colon, there is a risk of causing abrasions on the mucous membrane when the distal end of the endoscope is turned in the advancing direction. In addition, when the mucous membrane is sucked into the hood in order to perform mucosal resection, solid stool and residue in the digestive tract are sucked into the hood, making it difficult to remove from the hood. In some cases, it was significantly reduced. Furthermore, even if the sucked solid stool and residue can be removed by injecting distilled water from a nozzle or forceps hole provided in the endoscope, the observation field of view may be reduced by water droplets attached to the inner surface of the hood. Was. Further, the outer periphery of the distal end of the hood is reflected in an endoscopic image, and there is a problem that even if the hood is transparent, the operator feels troublesome.

[0004] On the other hand, a hood having a short effective length can solve the above-mentioned drawbacks.
There are problems such as difficulty in performing resection. Therefore, a short hood may be used during an examination and a long hood may be used during a procedure, in which case the endoscope must be reinserted to replace the hood, which not only causes pain to the patient, but also However, there is a problem that the treatment time is significantly long.

[0005] Regardless of the effective length of the hood,
Since the tip of the hood was hard and thin, there was a risk of bleeding or perforation from the intestinal tract. In addition, the intestinal tract of the large intestine is extremely thin, and there is a high risk of perforation. Therefore, the suction operation into the hood is contraindicated. However, depending on the operation, a suction operation may be required, and a hood that can safely perform this operation has been desired. Further, when a hood having fixing means detachable from the endoscope as shown in FIG. 2 is used,
If there is no means for securely fixing the endoscope, the hood may be shifted to the rear of the endoscope when the endoscope is inserted. A certain distance cannot be maintained between the lens surface of the endoscope and the digestive tract wall, and the digestive tract wall comes into close contact with the lens of the endoscope, and the visual field may be lost.

[0006]

SUMMARY OF THE INVENTION The present invention has been made as a result of many studies to solve the problems of an endoscope hood having a conventional structure. An object of the present invention is to provide an endoscope hood that facilitates insertion of an endoscope, quickly and surely finds a lesion site, and can perform safe and accurate endoscopic treatment.

[0007]

Means for Solving the Problems A first invention of the present invention is:
A slide hood having a rib on the outer periphery of a rear end portion is attached to the outer periphery of the distal end portion of the endoscope formed in a cylindrical shape, and the slide hood is further covered with an outer cylinder having a rib on the inside of the distal end portion. The rear end of the outer tube is integrated with the end of the endoscope, and a seal ring is attached to the rear end of the slide hood to provide an outer peripheral surface of the endoscope end and an inner peripheral surface of the outer tube. And an annular space formed by surrounding the rear end face of the slide hood in an airtight manner, and at least one small hole is provided in a rear end portion of the annular space so that a fluid flow path provided in the endoscope in advance is provided. By connecting and operating the piston of the syringe back and forth through the flow path, the fluid is fed into and sucked into the annular space, and the slide hood can be projected from the tip of the endoscope and retracted. It is a hood for an endoscope.

According to a second aspect of the present invention, a slide hood having a rib on the outer periphery of a rear end is mounted on an inner cylinder having fixing means detachable from an endoscope, and the slide hood is further provided with an inner side of a distal end. The outer cylinder having a rib is covered, and the rear end of the inner cylinder and the rear end of the outer cylinder are integrated, and a seal ring is attached to the rear end of the slide hood, and the outer peripheral surface of the inner cylinder,
An annular space formed by being surrounded by the inner peripheral surface of the outer cylinder and the rear end surface of the slide hood is kept airtight, and at least one small hole is provided at the rear end of the annular space, and is provided in the endoscope in advance. Fluid to the annular space by operating the piston of the syringe back and forth through the flow path,
This is a hood for an endoscope in which a slide hood can be protruded from a distal end of the endoscope by suction and retracted.

In the second aspect of the present invention, when the slide hood is completely retracted and stored in the annular space, the end of the slide hood is protruded from the end of the endoscope so as to protrude beyond the end of the endoscope. An endoscope fixing rib is provided. Further, a rib is provided on the outer periphery of the leading end of the slide hood, and the slide hood and the outer cylinder are subjected to hydrophilic treatment as necessary.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a view showing an endoscope hood according to a first embodiment of the present invention. FIG. 1 (a) is a cutaway sectional view of an endoscope tip provided with the endoscope hood, and FIG. FIG. 3C is a diagram illustrating a state in which the slide hood is retracted, and FIG.

A slide hood (2) having a rib on the outer periphery of a rear end is mounted on an outer peripheral surface of a distal end of the endoscope (7) formed in a cylindrical shape. Is covered with an outer cylinder (3) having a rib on the inside of the distal end, and the rear end of the outer cylinder (3) is integrated with the distal end of the endoscope (7). Further, a seal ring (4) is attached to the rear end of the slide hood (2), and the rear end of the seal ring (4) is sandwiched between the distal end of the outer cylinder (3) and the endoscope (7). An airtight annular space (11) is formed. A tube (6) attached to an endoscope (7) in advance is connected to the rear end of the annular space (11) to send fluid, and a syringe (10) and a fluid are connected to the rear end of the tube (6). A connector (8) is provided for receiving the data. The connector (8) is preferably provided with an opening / closing mechanism such as a one-way valve in order to prevent the supplied fluid from leaking. An annular space (1) from a syringe (10) via a tube (6).
By feeding a fluid into 1), the slide hood (2) can be made to protrude to the state shown in FIG. 1 (c), and the protruded slide hood (2)
From the annular space (11), the supplied fluid is transferred to the syringe (1).
FIG. 1 shows the structure of FIG.
The state shown in (b) can be set.

As described above, according to the present invention, the slide hood can be easily protruded and retracted by the syringe operation at hand. Further, according to the present invention, the length of the slide hood at the time of projection is determined depending on the purpose of use by the syringe (1).
It is also possible to arbitrarily set by adjusting and controlling the flow rate of the fluid according to 0), and the distance between the endoscope and the object to be observed on the digestive tract can be arbitrarily maintained. According to the present invention, the slide hood (2) is not limited to a cylindrical shape, but may be an oblique one as shown in FIG. Further, as shown in FIG. 4, a hook (12) may be provided inside the tip of the slide hood (2) so that the snare (14) can be placed therein, and in particular, the esophagus, stomach and rectum It is suitable when mucosal resection by suction can be performed as described above.

In the above-described embodiment, the endoscope hood is fixed in a state incorporated in the endoscope. However, the present invention is not limited to this embodiment. As in the second embodiment shown in FIG. 2, an endoscope hood may be configured to be detachable from the endoscope. FIG. 2 (a) shows an embodiment in which the slide hood is retracted. FIG. 2B shows a state in which the slide hood is projected, and FIG. 2C shows a state in which the slide hood is projected. The inner cylinder is attached to the endoscope (7) by a fixing means detachable from the endoscope. In FIG. 2, a mounting tube (5) is provided at the rear end of the inner tube (1) as a fixing means. The endoscope hood is fixed to the endoscope (7) by fitting the mounting tube (5) into the endoscope (7). It is necessary that the mounting cylinder (5) is not easily detached from the endoscope, and that air is hardly leaked when a mucous membrane or the like is sucked under negative pressure. However, if the fitting with the endoscope is too tight, the endoscope is likely to break down,
It is preferable to use a material having appropriate flexibility and sealing properties for the mounting cylinder (5). For example, various rubbers such as a thermoplastic elastomer, silicone rubber, and isoprene rubber are suitable. However, the endoscope fixing means used in the present invention is not limited to this mounting tube.

A slide hood (2) having a rib on the outer periphery of the rear end is mounted on the outer peripheral surface of the inner cylinder (1).
The slide hood (2) is covered with an outer cylinder (3) having a rib on the inside of the distal end, and the rear end of the outer cylinder (3) is integrated with the rear end of the inner cylinder (1). . Further, a seal ring (4) is attached to the rear end of the slide hood (2), and an air-tight ring sandwiched between the outer cylinder (3) and the inner cylinder (1) is provided behind the seal ring (4). A space (11) is formed. A tube (6) for sending a fluid is connected to the rear end of the annular space (11). The tube (6) may be provided in the endoscope in advance, or may be fixed to the outside of the endoscope with tape.

In the second embodiment, the hood can be more securely fixed to the endoscope by providing the endoscope fixing rib (16) inside the distal end of the inner cylinder. Becomes One embodiment is shown in FIG. This third
According to the embodiment, the distal end of the endoscope (7) is pressed against the endoscope fixing rib (16), whereby the fixing of the endoscope hood is further stabilized. There is no particular limitation on the form of the rib (16), and for example, one to three protrusions may be provided, or a circumferential rib may be provided.

The endoscope fixing rib (16) has a depth of 1 to 5 when the hood (2) is completely retracted.
mm is preferable, and more preferably 2-3 mm
It is provided at a position where If the depth is less than 1 mm, the digestive tract wall contacts the tip of the endoscope and loses the visual field, and if it exceeds 5 mm, the tip of the hood is always reflected in the endoscope image, and the observation field of view when the hood retreats is poor. Is not preferred. Further, in the first, second or third embodiment described above, a rib (15) is provided on the outer peripheral portion of the tip of the slide hood (2).
Is preferable because the mucous membrane is not damaged at the tip of the slide hood (2) when the endoscope is inserted or when the mucous membrane is sucked into the hood. One embodiment is shown in FIG.

According to the fourth embodiment, the rib (15)
Has a curved shape and is provided on the outer periphery of the distal end of the slide hood (2). However, when the endoscope hood is used for treatment in the colon except the rectum, the rib (15) must not protrude inside the inner cylinder (1). At the above site, mucosal resection by suction is basically not performed because of the risk of perforation, so that the hook (12) as shown in FIG. 4 is unnecessary, and the rib (15) like this hook has the rib (15) inside. If the treatment tool such as a snare is inserted through the forceps hole (9), the distal end of the treatment tool may be caught by the rib, and it may not be possible to cut a polyp or the like. Further, the size of the rib (15) is preferably set to be substantially the same as the outer diameter of the outer cylinder (3). If the outer diameter of the rib (15) is larger than the outer diameter of the outer cylinder (3), the insertability of the endoscope and the field of view when the slide hood (2) is protruded deteriorate, which is not preferable. If the outer diameter of the slide hood (2) is reduced, a step is generated between the rib (15) and the outer cylinder (3) when the slide hood (2) is retracted, and the mucous membrane of the digestive tract is easily damaged when the endoscope is inserted. Is not preferred.

The material constituting the ribs (15) is preferably a thermoplastic elastomer having a Shore hardness smaller than A100, a transparency, and a small coefficient of static friction on living tissue. If the Shore hardness is larger than A100, the mucous membrane is easily damaged when the mucous membrane is sucked into the slide hood (2), which is not preferable. If natural rubber or silicone rubber without transparency is used, the slide hood (2)
When the ribs (15) are projected in the endoscope field of view when protruding, a good visual field cannot be obtained, and since the friction coefficient is high, resistance is generated when the mucous membrane is sucked into the slide hood (2). It is not preferable because it may not be possible to completely suck the desired range. Rib (15) is slide hood (2)
Is fixed by post-processing to the tip of. The fixing method is not limited, and may be adhesion or welding, and is determined in consideration of the material of the slide hood (2) and the material of the rib (15).

The material which can be used for the rib (15) is not particularly limited as long as it satisfies the above-mentioned conditions. For example, polyolefin-based elastomer, polyamide-based elastomer, polyester-based elastomer, polyurethane, or a polymer alloy thereof may be used. Can be used. However, the present invention does not limit the material of the rib (15) to the thermoplastic elastomer, but may be the same hard material as the slide hood (2). Furthermore, in the above-mentioned embodiments 1, 2, 3 or 4, particularly when a water droplet adheres to the surface of the slide hood (2) when the endoscope is inserted with the slide hood (2) protruding. However, in order to secure a visual field and to reduce the coefficient of friction against living tissue, the inner and outer surfaces of the slide hood (2) and the outer surface of the outer cylinder (3) or the outer surface of the rib (15) are subjected to a hydrophilic treatment. May be.

In the fifth embodiment, examples of a method of applying a hydrophilic treatment to the slide hood (2) and the outer cylinder (3) or the rib (15) include a plasma treatment and a method of coating a hydrogel. . By performing the hydrophilic treatment on the inner and outer surfaces of the slide hood, even when water droplets adhere to the surface, the contact angle with the water droplet is reduced and the refraction angle of light is reduced, so that a good visual field can be obtained.
Furthermore, if a similar hydrophilic treatment is applied to the outer surface of the outer cylinder (3) or the rib (15), the coefficient of friction with the living tissue is reduced, so that the abrasion of the mucous membrane caused by the endoscope hood is further reduced. Becomes possible. The gas used for the plasma processing and the processing conditions differ depending on the material used for the slide hood (2), but it is necessary to select conditions that do not impair the transparency of the slide hood (2). Also,
The hydrogel to be used is preferably hyaluronic acid, polyvinylpyrrolidone, acrylamide, hydroxyethyl methacrylate, polyethylene glycol, or a copolymer thereof.

Next, members required for carrying out the present invention will be described. The inner cylinder (1), the slide hood (2) and the outer cylinder (3) used in the present invention preferably have transparency. Especially slide hood (2)
However, if the transparency is not sufficient, it is not preferable because the viewing field becomes narrow when the slide hood (2) is protruded, or the observation through the slide hood (2) cannot be performed. The slide hood (2) is provided on the outer peripheral surface of the distal end portion of the endoscope in FIG.
(A) It is preferable that the slidability between the outer peripheral surface of the inner cylinder (1) and the inner peripheral surface of the outer cylinder (3) is good. Therefore, the inner cylinder (1), the slide hood (2), and the outer cylinder The tube (3) requires high dimensional accuracy. In addition, these members need to have a thin and moderate mechanical strength in order to minimize the bulk of the endoscope end after the endoscope hood is attached and to have a structure capable of withstanding a fluid supply or suction pressure. There is. Materials used for the inner cylinder (1), the slide hood (2) and the outer cylinder (3) satisfying such conditions are, for example, polycarbonate resin, polyvinyl chloride resin, polysulfone resin, acrylic resin, ABS resin, polymethylpentene. Resins, polyamide resins, polyurethane resins, polyester resins and the like and polymer alloys thereof are suitable.

The seal ring (4) used in the present invention maintains the airtightness of the annular space, and has the outer peripheral surface of the distal end portion of the endoscope in FIG. 1 (a) or the inner cylinder (1) in FIG. 2 (a). ) And the inner peripheral surface of the outer cylinder (3) must have sufficient slidability. As the material to be used, for example, rubber such as silicone rubber and isoprene rubber and soft plastic are suitable, but silicone rubber containing at least 5% silicone oil is particularly preferable. Further, in the present invention, in order to improve the airtightness and slidability of the seal ring (4), the surface of the seal ring (4) may be lubricated,
(A) adjusting the surface roughness of the outer peripheral surface of the distal end portion of the endoscope, the outer peripheral surface of the inner cylinder (1) and the inner peripheral surface of the outer cylinder (3) in FIG. May be applied. Slide hood (2) for seal ring (4)
For example, the seal ring may be adhered to the slide hood, or the seal ring (4) and the slide hood (2) may be provided with irregularities so that the rear end can be fitted to the rear end. good.

The tube (6) used in the present invention is preferably incorporated in the endoscope (7) in advance, but may be fixed to the outside of the endoscope (7) with tape. In this case, it is necessary to select a material for the tube (6) which is flexible but does not bend or bend by the operation of the endoscope, and which can withstand the supply or suction pressure of the fluid. As a material satisfying such a condition, a flexible polymer material such as a polyamide resin, a vinyl chloride resin, and a polyurethane resin is preferable. Further, in order to improve the pressure resistance and strength, the tube may be reinforced with a mesh such as polyester fiber or metal wire.

Next, the method of using the hood for an endoscope according to the present invention will be described with reference to the case of a large intestine endoscope to clarify the effects of the present invention. An endoscope (6) provided with an endoscope hood according to the present invention is inserted from the anus. If necessary, slipping may be improved with xylocaine jelly, glycerin, or the like. However, when the surface is subjected to hydrophilic treatment as described in the fifth embodiment, insertion is possible without this necessity. Further, in the fourth embodiment, since the rib (15) is provided, the slide hood (2) can be inserted without damaging the mucous membrane at the distal end. At this time, the slide hood (2) is in a completely retracted state. If the slide hood (2) is inserted as it is, the mucous membrane comes into close contact with the end of the endoscope, and an image of the endoscope called red ball becomes bright red. The direction in which the endoscope (7) should be inserted is lost, making it difficult to insert while viewing the image.

Then, when a fluid is fed from the syringe (10) into the annular space (11) of the endoscope hood, and the slide hood (2) is projected forward, the mucous membrane adhered to the end of the endoscope is removed. The slide hood (2) pushes and separates the endoscope (7) to the range of the focal length of the endoscope (7), and the state of the mucous membrane at the inserted site is displayed on the image. Next, when air is supplied into the large intestine to expand the flat large intestine, the traveling direction of the endoscope is displayed on an image. In the first and third embodiments in which the depth of the hood when the slide hood (2) is completely retracted is not 0 and is within the focal length of the endoscope, the endoscope endoscope and the mucous membrane Since the distance is kept between, it is always possible to observe without red balls. Also, if you want to observe the wide area as much as possible by pulling the lens of the endoscope from the mucous membrane,
The slide hood (2) may be protruded in the same manner as described above.

Subsequently, when the slide hood (2) is made to protrude when passing through a severely bent part such as the sigmoid colon, mucous membrane damage may be caused by the edge of the slide hood (2). Therefore, the fluid in the annular space (11) is sucked and removed by the syringe, the slide hood (2) is retracted, and the end of the endoscope is made the shortest, so that the end of the endoscope can be passed. Further, as in the fourth embodiment, a rib (1) is provided at the tip of the slide hood (2).
By providing 5), even if the endoscope is strongly inserted and the intestinal tract is pressed by the tip, abrasion or perforation of the mucous membrane is not caused. Further, if the hydrophilic treatment is performed as in the fifth embodiment, the endoscope can be inserted more safely.

Further, in the case of observing a lesion site by staining, the slide hood (2) is retracted because the slide hood itself or the stain attached to the slide hood is not sufficiently observed in the image and cannot be observed. Then, the slide hood (2) should not be reflected in the image. But,
When observing a site with a strong flexion or a lesion located behind the fold of the large intestine, as shown in FIG. 3, the slide hood (2) is protruded and the tip is gently pressed, thereby facilitating the target site. Observation is possible. in this way,
When the hood for an endoscope according to the present invention is used, it is easy to always insert the endoscope while checking the traveling direction of the endoscope, so that the insertion time can be shortened and the burden on the patient and the doctor can be reduced.

As shown in FIG. 3, a hook (12) is provided on the inner periphery of the tip of the slide hood (2) so that the snare (14) can be installed in advance, and the result of the inspection by the above-described means is performed. In particular, when a lesion to be resected is found in the rectum, the lesion is sucked into the slide hood with the slide hood (2) protruding, and the high frequency current is applied after the lesion is strangled by the snare (14). Can be cut off by energizing. The excised lesion is collected by suction into a protruding slide hood (2).

[0029]

According to the endoscope hood of the present invention,
Since the depth of the slide hood can be easily adjusted by a syringe operation when the endoscope is attached, it is possible to sequentially change the state of protrusion or retreat and use the endoscope,
It is extremely effective as an endoscope hood that facilitates accurate inspection of the digestive tract or easy operation of removing and collecting a lesion.
Furthermore, since the distance between the endoscope and the object to be observed on the digestive tract can be maintained in at least two stages, the workability and safety when the endoscope is inserted are improved, and the endoscope is located behind the folds of the digestive tract. Various advantages can be provided to the surgeon and the patient, such as the ability to observe a lesion.

[Brief description of the drawings]

FIG. 1 is a view showing a form of an endoscope hood according to an embodiment of the first invention, wherein FIG. 1 (a) is a cutaway sectional view of an endoscope distal end provided with the endoscope hood, FIG. (b) is a diagram showing a state where the slide hood is retracted, and (c) is a diagram showing a state where the slide hood is protruding.

FIG. 2 is a view for explaining a form of an endoscope hood according to an embodiment of the second invention, and FIG. 2 (a) shows a state in which a detachable endoscope hood is mounted on the endoscope; Cutaway sectional view,
(B) is a diagram showing a state in which the slide hood is retracted,
(C) is a figure which shows the state in which the slide hood has protruded.

FIG. 3 is a view showing one usage example of the endoscope hood according to the present invention.

FIG. 4 is a diagram illustrating an embodiment of a slide hood of an endoscope hood according to the present invention.

FIG. 5 is a view for explaining another embodiment of the slide hood of the hood for an endoscope according to the present invention.

FIG. 6 is a diagram illustrating a form of an endoscope hood according to an embodiment of the third invention.

FIG. 7 is a diagram illustrating a form of an endoscope hood according to an embodiment of the fourth invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 inner cylinder 2 slide hood 3 outer cylinder 4 sealing ring 5 mounting cylinder 6 tube 7 endoscope 8 connector 9 forceps hole 10 syringe 11 annular space 12 hook 14 snare 15 rib 16 endoscope fixing rib

 ──────────────────────────────────────────────────続 き Continued on the front page (31) Priority claim number Japanese Patent Application No. Hei 10-179335 (32) Priority date June 25, 1998 (June 25, 1998) (33) Priority claim country Japan (JP)

Claims (5)

[Claims] 1. A slide hood having a rib on an outer periphery of a rear end portion is mounted on an outer periphery of a distal end portion of a cylindrical endoscope, and the slide hood further has a rib on an inner side of the distal end portion. The outer tube is covered, the rear end of the outer tube is integrated with the end of the endoscope, and a seal ring is attached to the rear end of the slide hood. The annular space formed by being surrounded by the inner peripheral surface of the cylinder and the rear end surface of the slide hood is kept airtight, and at least one small hole is provided at the rear end of the annular space, and is provided in advance in the endoscope. By connecting to the fluid flow path and operating the syringe piston back and forth through the flow path, the fluid is fed into and sucked into the annular space, allowing the slide hood to protrude from the tip of the endoscope and retreat. Features a hood for endoscopes. 2. A slide hood having a rib on the outer periphery of a rear end portion is attached to an inner cylinder having fixing means detachable from the endoscope, and an outer tube having a rib inside a distal end portion of the slide hood. Covering the cylinder, the rear end of the inner cylinder and the rear end of the outer cylinder are integrated, and a seal ring is attached to the rear end of the slide hood to provide the outer peripheral surface of the inner cylinder and the inner circumference of the outer cylinder. An annular space formed by surrounding the surface and the rear end surface of the slide hood is airtightly held, and at least one small hole is provided at a rear end portion of the annular space to provide a fluid flow path provided in the endoscope in advance. And the slide hood can be projected and retracted from the distal end of the endoscope by sending and sucking fluid into the annular space by operating the piston of the syringe back and forth through the flow path and sucking it. Hood for endoscope. 3. When the slide hood is completely retracted and housed in the annular space, the end of the slide hood is fixed to the inner periphery of the end of the inner cylinder so that the end of the slide hood projects from the end of the endoscope. The hood for an endoscope according to claim 2, further comprising a rib. 4. The endoscope hood according to claim 1, wherein a rib is provided on an outer peripheral portion of a tip of the slide hood. 5. The endoscope hood according to claim 1, wherein the slide hood and the outer cylinder are subjected to a hydrophilic treatment.