WO2015053313A1

WO2015053313A1 - Mouthpiece for endoscopic examination and de-aeration prevention valve device

Info

Publication number: WO2015053313A1
Application number: PCT/JP2014/076947
Authority: WO
Inventors: 泰大森; 秀明松波; 池田　昌夫; 新悦原田; 秀昭浅井; 愛志賀; 芳樹豊田
Original assignee: 住友ベークライト株式会社
Priority date: 2013-10-10
Filing date: 2014-10-08
Publication date: 2015-04-16
Also published as: JP2015213733A; JP6428127B2

Abstract

Provided is a mouthpiece for endoscopic examinations, comprising: a mouthpiece main body having an insertion hole through which an endoscope is freely inserted and removed; and a de-aeration prevention valve device that provides an airtight seal between the endoscope inserted into the insertion hole and the mouthpiece main body.

Description

Mouthpiece for endoscopy and anti-aeration valve device

The present invention relates to an endoscopy mouthpiece that can be used for oral endoscopy and an anti-aeration valve device used for an endoscope mouthpiece.
This application is filed on October 10, 2013, Japanese Patent Application No. 2013-212462, filed on October 10, 2013, Japanese Patent Application No. 2013-212484, filed on Japan, April 25, 2014 Claims priority based on Japanese Patent Application No. 2014-91182 filed in Japan, the contents of which are incorporated herein by reference.

Conventionally, in the treatment using an endoscope that is scheduled to be inserted and removed multiple times, in order to protect the body cavity and prevent the tissue collected from the affected part from coming into contact with the body cavity, It is common to insert a long tube called a tube or the like into a body cavity in advance. The long tube secures an insertion path of the endoscope through a small body cavity such as the pharynx or the esophagus.

On the other hand, in normal endoscopy, it is common to carry out a mouthpiece that can be inserted and removed from the mouth of the patient, and a large number of endoscope mouthpieces. It has been known. (For example, patent document 1).

By the way, in recent years, many superficial cancers have become discoverable due to the development of endoscopic technology. As the treatment of esophageal cancer spreads and develops along with this, the close relationship between esophageal cancer and cancer of the middle and lower pharynx has become clear year by year. The importance of early detection of mesopharyngeal cancer by conducting tests for mesopharyngeal cancer as a follow-up to esophageal cancer treatment has been proposed.
However, there are parts of the middle and lower pharynx that are difficult to observe because of their complex shapes. On the other hand, attention has been paid to a technique for performing endoscopic observation by using the Valsalva method that makes the patient breathe, with the larynx raised and the oral pharynx filled with air.

JP 2012-231833 A

However, in general, conventional endoscope mouthpieces are not improved in terms of preventing breathing and improving air tightness in the oral cavity during use, and it is difficult to properly perform the Valsalva method. Met. For example, as a specific example, the diameter of the endoscope insertion hole in the conventional mouthpiece is designed to be larger than the diameter of the endoscope. Therefore, when a conventional mouthpiece is used when examining the middle and lower pharynx, breath is leaked from between an endoscope insertion hole provided in the mouthpiece and an endoscope inserted through the endoscope insertion hole.

In addition, in order to reliably hold the breath, it has been attempted to insert an endoscope directly into the middle and lower pharynx without using a mouthpiece and perform endoscopic observation by the Valsalva method. However, in such attempts, although the patient can easily take a breath by closing his / her mouth, there arises a problem that the patient bites the endoscope and the endoscope is easily damaged. In the above attempt, there is a problem that the patient strongly holds the endoscope and the operability of the endoscope is reduced.
As described above, in a test using a conventional mouthpiece, there is generally no desire to prevent a gas such as air from leaking from the body.
However, when a new technique such as the Valsalva method is required to breathe and raise the larynx, the conventional mouthpiece cannot be fully breathed. There was a problem that the larynx could not be raised with the mouthpiece held in place, and the middle and lower pharynx could not be observed sufficiently.

The present invention has been made in view of the above-described problems. In other words, in a test using a mouthpiece, it is possible to prevent a gas such as breath from leaking out of the body from the mouth during the test, in response to a new problem that it is desirable to be able to breathe with the mouthpiece attached. A mouthpiece for endoscopy is provided. Moreover, this invention provides the deaeration prevention valve apparatus used for the mouthpiece for endoscopes made | formed in view of the said subject.

The mouthpiece for endoscopy of the present invention includes a mouthpiece body having an insertion hole through which an endoscope can be inserted and removed, and between the endoscope inserted through the insertion hole and the mouthpiece body. And a deaeration prevention valve device that hermetically seals.

Further, the first deaeration prevention valve device of the present invention is detachably attached to the proximal end portion of the mouthpiece inserted into the oral cavity having a lumen through which the endoscope is inserted and removed. A deaeration prevention valve device used for an endoscope mouthpiece, the frame portion mounted on the outer peripheral surface of the base end portion of the mouthpiece, and the frame portion provided on the base end portion and the base end portion And a valve body portion provided inside the frame portion, the valve body portion being provided at a substantially central portion of the valve body portion. And an annular endoscope insertion portion that is circumferentially attached to the endoscope, and a flexible expansion / contraction means provided around the endoscope insertion portion.

The second deaeration prevention valve device of the present invention is detachably attached to the base end portion of the mouthpiece inserted into the oral cavity having a lumen through which the endoscope is inserted and removed. A deaeration prevention valve device used for an endoscope mouthpiece, a frame portion mounted on an inner peripheral surface of the base end portion of the mouthpiece, and provided on the frame portion, A locking portion that is detachably locked to the inner peripheral surface, and a valve body portion provided inside the frame portion, wherein the valve body portion is provided at a substantially central portion of the valve body portion. An annular endoscope insertion portion provided around the endoscope and a flexible extension / contraction means provided around the endoscope insertion portion.

The mouthpiece for endoscopy of the present invention has an insertion hole through which an endoscope can be inserted and removed. The insertion hole is provided with a deaeration prevention valve device that hermetically seals between the insertion hole and the endoscope. Therefore, the mouthpiece for endoscopy of the present invention can prevent gas leakage from the insertion hole through which the endoscope is inserted.
Further, according to the deaeration prevention valve device of the present invention, by using the mouthpiece for an endoscope, the visual field of the hypopharynx can be secured by filling the oral pharynx with air in the Valsalva method, and further It is possible to reduce mirror breakage and endoscope operability degradation. In addition, since the deaeration prevention valve device of the present invention can be attached to and detached from the endoscope mouthpiece, airtightness securing by the deaeration prevention valve device can be selected and performed when necessary. Therefore, a specific endoscope mouthpiece can be applied not only to the Valsalva method but also to various examinations and treatments.

It is a perspective view which shows an example of the mouthpiece for endoscopy concerning 1st embodiment of this invention. It is a front view of the mouthpiece for endoscopy shown in FIG. FIG. 2 is an XX cross-sectional view of the mouthpiece for endoscopy shown in FIG. It is a reverse view of the mouthpiece for endoscopy shown in FIG. It is a disassembled perspective view of the mouthpiece for endoscopy shown in FIG. It is a front view of the mouthpiece body in the first embodiment of the present invention. It is a side view of the mouthpiece body in a first embodiment of the present invention. It is a perspective view which shows an example of the mouthpiece for endoscopy concerning 2nd embodiment of this invention. It is a disassembled perspective view of the mouthpiece for endoscopy shown in FIG. FIG. 9 is a YY sectional view of the mouthpiece for endoscopy shown in FIG. 8. It is a disassembled perspective view of the mouthpiece for endoscopy concerning a third embodiment of the present invention. FIG. 12 is a ZZ sectional view of the mouthpiece for endoscopy shown in FIG. 11. It is the perspective view which looked at the state which attached the coating | coated part used for the modification of the 3rd Example of this invention to the mouthpiece main body from the back side. It is a perspective view of the mouthpiece main body and cover part used for 4th embodiment of this invention. The upper view is a perspective view in which the deaeration prevention valve device according to the fifth embodiment of the present invention is mounted on an endoscope mouthpiece, and the lower view is a perspective view before the mounting. It is sectional drawing which mounted | wore the endoscope mouthpiece with the deaeration prevention valve apparatus which concerns on 5th embodiment of this invention. It is a front view of the deaeration prevention valve apparatus which concerns on 5th embodiment of this invention. It is a top view of the deaeration prevention valve apparatus which concerns on 5th embodiment of this invention. It is BB sectional drawing of FIG. It is a rear view of the deaeration prevention valve apparatus which concerns on 5th embodiment of this invention. It is sectional drawing of the deaeration prevention valve apparatus which concerns on the 1st modification of this invention. It is sectional drawing of the deaeration prevention valve apparatus which concerns on the 2nd modification of this invention. It is a perspective view before mounting | wearing with the deaeration prevention valve equipment which concerns on 6th embodiment of this invention, and the mouthpiece for endoscopes. It is sectional drawing which mounted | wore the mouthpiece for endoscopes with the deaeration prevention valve apparatus which concerns on 6th embodiment of this invention. It is sectional drawing of the deaeration prevention valve apparatus which concerns on 6th embodiment of this invention. It is sectional drawing of the mouthpiece for endoscopes which concerns on 6th embodiment of this invention.

Hereinafter, embodiments of the present invention will be described. In all the drawings used in the description, the same components are denoted by the same reference numerals, and redundant descriptions are appropriately omitted.
In all of the embodiments described in the present specification, there may be cases where the front, rear, left, right, and top directions are defined and illustrated as illustrated. However, this is provided for convenience in order to simply explain the relative relationship of the components, and does not limit the direction during the manufacture or use of the product implementing the present invention.
The various constituent elements of the mouthpiece for endoscopy and the deaeration prevention valve device of the present invention do not have to be independent of each other, and a plurality of constituent elements are formed as one member. One component is made up of multiple members, one component is a part of another component, and one component is a part of another component , Etc.

In describing the present invention, the terms proximal end, distal end, proximal end, and distal end are used where appropriate. These terms indicate a specific region or specific location of the mouthpiece of the present invention or each member constituting the mouthpiece in a use state when the patient holds the mouthpiece of the present invention in his / her mouth. Specifically, the distal end indicates the end on the patient side (inner oral cavity), and the proximal end indicates the end on the opposite side (outer oral cavity) from the patient side. The distal end portion refers to a predetermined length region including the distal end, and the proximal end portion refers to a predetermined length region including the proximal end.
In describing the present invention, the term endoscopy is used where appropriate. The above terms are used not only for endoscopic examination in a narrow sense such as observing the state of the affected area using an endoscope, but also for performing operations such as treating the affected area using an endoscope and collecting tissues of the affected area. In this case, the endoscopic examination in a broad sense is also included as appropriate.
In this specification, the person who holds the mouthpiece and undergoes endoscopy may be referred to as a patient. A person who handles an endoscope using a mouthpiece may be called an operator.

<First embodiment>
Hereinafter, the mouthpiece 100 according to the first embodiment of the mouthpiece for endoscopy (hereinafter sometimes simply referred to as “mouthpiece”) according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7. Explained. FIG. 1 is a perspective view showing an example of a mouthpiece 100 according to the first embodiment of the present invention. FIG. 2 is a front view of the mouthpiece 100 shown in FIG. FIG. 3 is a cross-sectional view of the mouthpiece 100 shown in FIG. FIG. 4 is a rear view of the mouthpiece 100 shown in FIG. FIG. 5 is an exploded perspective view of the mouthpiece 100 shown in FIG. 1, showing a state in which the mouthpiece 100, the mouthpiece body 11, and the covering portion 28 are disassembled. FIG. 6 is a front view of the mouthpiece body 11 in the first embodiment of the present invention. FIG. 7 is a side view of the mouthpiece body 11 in the first embodiment of the present invention.
Both the front view of the mouthpiece 100 and the front view of the mouthpiece body 11 are views observed from the long axis direction of the tooth receiving portion 26 (FIGS. 3 and 4).

The mouthpiece 100 includes a mouthpiece body 11 having an insertion hole 12 through which an endoscope (not shown) can be inserted and removed freely, and between the endoscope inserted through the insertion hole 12 and the mouthpiece body 11. And an anti-aeration valve device 18 for hermetically sealing.
The endoscope includes an oral endoscope or a nasal endoscope, and is a medical instrument that is inserted into a body cavity and used to examine or treat an affected area.
In the present embodiment, the mouthpiece 100 is positioned in front of the pharynx with the distal end of the mouthpiece 100 in a state where the patient is in the mouth. That is, the mouthpiece 100 does not extend beyond the pharynx at the distal end of the overtube as in the so-called overtube.

With this configuration, when the mouthpiece 100 is inspected by inserting the endoscope through the insertion hole 12, gas such as breath flows from between the endoscope inserted through the insertion hole 12 and the mouthpiece body 11. Leakage through the mouth can be prevented or reduced. Therefore, it is possible to observe the state of the hypopharynx in detail with an endoscope, for example, in a state where the patient is breathing and the larynx is raised.
In the present embodiment, the insertion hole 12 is a lumen of both end openings provided in the mouthpiece body 11. In the present embodiment, the insertion hole 12 is reduced to such an extent that the flow of gas between the endoscope and the mouthpiece body 11 does not hinder the inspection in the region of the opening or any place between the openings. Or substantially shieldable.

The deaeration prevention valve device 18 in the present embodiment is detachable from the mouthpiece body 11 as will be described later. However, the mouthpiece 100 in the present embodiment includes an aspect including a deaeration prevention valve device 18 that is fixedly installed on the mouthpiece body 11 and cannot be repeatedly attached and detached.

Below, each structure of the mouthpiece 100 is demonstrated in detail.
The mouthpiece body 11 has an insertion hole 12 penetrating the inside. The insertion hole 12 opens at the proximal end and the distal end of the mouthpiece body 11.
As shown in FIG. 3, the insertion hole 12 in the present embodiment has a constricted shape having a reduced diameter portion 110 and an enlarged diameter portion 111 from the proximal end to the distal end of the mouthpiece body 11.
The boundary between the reduced diameter portion 110 and the enlarged diameter portion 111 is a boundary portion 112.
The reduced diameter portion 110 refers to a region in which the inner diameter of the insertion hole 12 that is the lumen of the mouthpiece body 11 decreases continuously or stepwise. The enlarged diameter portion 111 is a region in which the inner diameter of the insertion hole 12 that is the lumen of the mouthpiece body 11 increases continuously or stepwise. The stepwise change in the diameter of the reduced diameter portion 110 or the enlarged diameter portion 111 may be a change in only one step, or may be a change in two or more steps.
In the present embodiment, the reduced diameter portion 110 is a proximal end portion of the mouthpiece body 11 and is provided closer to the proximal end.

The operation of the endoscope inserted through the insertion hole 12 is generally a parallel operation of moving the entire endoscope in a direction substantially parallel to the insertion direction, arbitrarily twisting the endoscope in the insertion direction, This is performed by a rotation operation for guiding the endoscope tip to a target position and a combination thereof.
In the operation of such an endoscope, according to the present embodiment including the reduced diameter portion 110 and the enlarged diameter portion 111, the parallel operation area is limited by the boundary portion 112, and the rotation operation area is sufficiently secured. Is possible. That is, when the endoscope inserted through the insertion hole 12 is operated in parallel or rotated, the movement of the endoscope by the operation causes distortion in the expansion / contraction part 16 (extension / contraction means). At this time, the stretchable part 16 can absorb the strain. However, if the strain is too large, the stretchable portion 16 cannot absorb the strain, and as a result, the endoscope insertion portion 17 is deformed, and a gap is generated between the endoscope insertion portion 17 and the endoscope. There is a fear. Therefore, by restricting the operation range of the endoscope (particularly the range of parallel operation) by the boundary portion 112, the occurrence of the above-mentioned fear is prevented, and the space between the endoscope insertion portion 17 and the endoscope is prevented by high airtightness. It can be made sealable. Details of the stretchable part 16 will be described later.
Such a configuration is desirable from the viewpoint of detailed observation when observing the pharynx or esophagus, which is an affected area relatively close to the insertion point of the endoscope (that is, the patient's mouth).

The reduced diameter portion 110 in the present embodiment has a circular funnel shape (see FIG. 3). For this reason, it is possible to smoothly guide the start of insertion of the endoscope through the insertion hole 12.
The insertion hole 12 in the present embodiment has a diameter that increases in the vicinity of the boundary portion 112 and has a straight cylindrical shape on the distal end side. The long cylindrical region is an ellipse whose outer shape and inner shape of a cross section cut perpendicularly to the insertion direction are substantially similar.
A vertical section with respect to the insertion direction on the distal end side from the boundary portion 112 forms an ellipse including a short axis and a long axis that are larger than the inner diameter of the reduced diameter portion 110.

The mouthpiece body 11 has a cylindrical tooth receiving portion 26 at the distal end. The outer diameter of the tooth receiving portion 26 has a major axis 36 and a minor axis 38 (see FIG. 4).
That is, the cross-sectional shape when the tooth receiving portion 26 is cut in the direction perpendicular to the longitudinal direction is not a perfect circle but is long in one direction. For example, the cross-sectional shape of the tooth receiving portion 26 is an ellipse (including an ellipse).
The tooth receiving part 26 having such a cross-sectional shape can easily bring the lip and the tooth receiving part 26 into close contact with each other in a state where the patient holds the mouthpiece 100 as compared with a case where the cross-sectional shape is a perfect circle. For this reason, it is possible to satisfactorily prevent breath leakage from between the lips and the tooth receiving portion 26. For example, the tooth receiving part 26 having an oval cross section can be given to the patient so that the major axis direction is substantially parallel to the direction connecting the mouth angle and the mouth angle of the patient, and the mouth can be closed. In such a case, the mouth corner and the ellipse fit, and it is difficult for the breath to leak from the mouth corner.

In the mouthpiece body 11 in this embodiment, the inner diameter of the tooth receiving portion 26 also has a major axis and a minor axis. As shown in FIGS. 6 and 7, the tooth receiving portion 26 is formed in an oval shape by a substantially uniform wall. Since the inner diameter shape of the tooth receiving portion 26 is formed in an ellipse, the operation range of the endoscope is large particularly in the long axis direction.
The tooth receiving portion 26 has a convex portion 30 protruding outward in the radial direction at the distal end portion of the tooth receiving portion 26. When the patient grips the mouthpiece 100 by directly applying teeth to the tooth receiving portion 26, the convex portion 30 functions as a stop portion of the patient's teeth and prevents the mouthpiece 100 from falling from the mouth. Is possible.

The mouthpiece 100 has a flange 42 extending outward from the outer peripheral surface 40 (FIG. 3) between the distal end portion and the proximal end portion of the mouthpiece body 11. The outer peripheral surface 40 is a surface constituting the outer side surface of the mouthpiece body 11.
As can be understood from FIG. 4, the collar portion 42 extends longer in the extending direction of the short shaft 38 than in the extending direction of the long shaft 36 of the tooth receiving portion 26.
For example, when the patient grips the mouthpiece 100 so that the extension direction of the long axis 36 and the line connecting the mouth angle and the mouth angle are substantially parallel, the buttocks 42 abut on the upper lip and the lower lip. As a result, the state in which the patient holds the mouthpiece 100 is stabilized, and it is difficult for the patient to leak from the mouth.

As shown in FIG. 1, the collar portion 42 in the present embodiment is curved in a convex shape in a direction from the distal end to the proximal end of the mouthpiece body 11. The details of the curved shape are not particularly limited, but, for example, when the collar portion 42 is observed with the long axis 36 set in the left-right direction, the collar portion 42 has a convex shape from the distal end portion toward the proximal end portion. (See FIG. 7).
By curving the buttocks 42 as described above, the surface on the distal end side of the buttocks 42 tends to be along the lips of the patient holding the tooth receiving portion 26. Thereby, the mounting property and airtightness of the mouthpiece 100 can be improved.
In this embodiment, the collar part 42 is a cylindrical surface which is a shape that forms a part of the outer surface of the cylindrical body. The central axis of the cylindrical body having the cylindrical surface is the same direction as the axial direction of the short axis 38.
That is, the collar part 42 has a shape along the outer peripheral surface of the virtual cylindrical body. For example, when the mouthpiece body 11 is held so that the central axis direction of the cylinder is the direction of the upper lip and the lower lip, the direction connecting the left and right mouth corners is the circumferential direction of the cylinder. Thereby, in the state which held the mouthpiece main body 11, the collar part 42 can contact | adhere well to a patient's mouth, and the mounting property of the mouthpiece main body 11 is good.

Next, the deaeration prevention valve device 18 will be described.
As shown in FIG. 3, the deaeration prevention valve device 18 is provided around the insertion hole 12. Further, the deaeration prevention valve device 18 is attached to an endoscope (not shown) inserted through the insertion hole 12.
That the deaeration prevention valve device 18 is provided around the insertion hole 12 means that the deaeration prevention valve device 18 is attached to the entire circumference of the insertion hole 12 at at least one end or in the middle of the insertion hole 12. Means. Specifically, in this embodiment, the expansion / contraction part 16 provided in the deaeration prevention valve device 18 is provided around the insertion hole 12 and is attached to the endoscope inserted through the insertion hole 12.
According to this configuration, when the endoscope inserted through the insertion hole 12 passes through the deaeration prevention valve device 18, the endoscope does not contact the inner wall surface of the insertion hole 12, and the deaeration prevention valve Around the device 18 is airtight. For this reason, it is difficult to generate a gap between the endoscope and the insertion hole 12, and air leakage from the mouth can be prevented.
In the present embodiment, the deaeration prevention valve device 18 is provided with a fixing ring 59 which is a fixing member for crimping the deaeration prevention valve device 18 to the open end surface on the proximal end side of the mouthpiece body 11 ( FIG. 3).
In the present embodiment, the fixing ring 59 constitutes an expansion / contraction section fixing member for fixing the expansion / contraction section 16 to the frame section 14 (FIG. 3).
The fixing ring 59 is a substantially ring-shaped member, and is provided in an intermediate region between the lower end portion 23 and the upper end portion 25 inside the frame portion 14.

In the present embodiment, the insertion hole 12 is a hole provided in the mouthpiece 100 and into which the endoscope is inserted. The deaeration prevention valve device 18 can be provided in one or more places in either the intermediate region of the insertion hole 12 or the opening region in the proximal end or the distal end of the insertion hole 12. The deaeration prevention valve device 18 is directly or indirectly provided in the insertion hole 12.

The deaeration prevention valve device 18 in the present embodiment has a flexible expansion / contraction part 16 (extension / contraction means) provided around the insertion hole 12 (FIG. 1). The expansion / contraction part 16 has an endoscope insertion part 17 that is provided at a substantially central part of the expansion / contraction part 16 and is attached to an endoscope (not shown).
The expansion / contraction part 16 is comprised with the flexible member which can contact | adhere airtightly to an endoscope.
The flexible expansion / contraction part 16 is comprised from the member which is film | membrane shape or disk shape, for example, and can be expanded-contracted in an in-plane direction. The film-shaped or disk-shaped stretchable part 16 includes both an aspect in which the in-plane is a substantially smooth surface and an aspect in which an uneven portion is provided in the plane. The uneven portion includes a bellows portion 120.
More specifically, the stretchable portion 16 may be a flat plate member made of a flat portion or a bellows member having the bellows portion 120, but is preferably a bellows member from the viewpoint of airtightness. The bellows member includes both an aspect in which the bellows part 120 is provided in the in-plane direction in substantially the entire stretchable part 16 and an aspect in which the flat part and the bellows part 120 are combined.
The endoscope insertion part 17 into which the endoscope is inserted by the extension / contraction of the extension / contraction part 16 can move following the endoscope by operation of the endoscope. The endoscope insertion portion 17 is movable in the radial direction, the forward / backward direction of the endoscope, and the rotation direction (the neck swinging direction or the twisting direction of the endoscope).
For this reason, when the endoscope inserted in the endoscope insertion portion 17 is operated, the airtightness between the deaeration prevention valve device 18 and the endoscope is maintained without impairing the operability of the endoscope. Is possible.
As shown in FIG. 3, a closing plug portion 60 that abuts the engagement receiving portion 54 of the mouthpiece body 11 and hermetically seals the opening on the proximal end side of the mouthpiece body 11 is provided on the outer edge of the expansion / contraction portion 16. Is provided. Details of the engagement receiving portion 54 will be described later. The closing plug portion 60 may be formed integrally with the stretchable portion 16, or may be formed by joining another member to the outer edge of the stretchable portion 16. The closing plug portion 60 can be formed of, for example, an elastic resin member. Specifically, for example, the closing plug portion 60 is similar to the stretchable portion 16 and can be formed of the same or different resin material.

The endoscope insertion portion 17 according to the present embodiment is annular. However, the endoscope insertion portion 17 in the present invention is not limited to this. For example, the endoscope insertion portion 17 may be a cut portion that is formed in the plane of the stretchable portion 16 and can penetrate the endoscope in the insertion direction of the insertion hole 12.

The diameter of the endoscope insertion portion 17 formed in an annular shape can be smaller than the diameter of the endoscope scheduled to be used. As a result, the peripheral attachment to the endoscope is ensured, and the airtight effect can be improved.

The expansion / contraction part 16 has a bellows part 120, a valley part 116, a valley part 114, a valley part 116, and a bellows part 120 which are provided concentrically with the annular endoscope insertion part 17. By having the bellows portion 120, the operability of the endoscope inserted into the endoscope insertion portion 17 can be further improved, and as a result, sufficient airtightness is maintained.
In the present embodiment, the inner edge of the bellows portion 120 is a valley portion 116 that overlaps most with the endoscope insertion portion 17. In the stretchable part 16 of the present invention, the part other than the bellows part 120 is referred to as a non-bellows part. The non-bellows part is a part other than the bellows part 120 in the stretchable part 16, and the stretchability in the in-plane direction of the non-bellows part is smaller than the stretchability in the in-plane direction of the bellows part 120. The non-accordion portion includes a flat portion. A flat part means the part which does not have an unevenness | corrugation substantially in the surface, when the expansion-contraction part 16 is observed visually.
In this embodiment, the stretchable portion 16 is formed of a flexible member, and the bellows portion 120 is provided. As a modification of the present embodiment, the stretchable portion 16 can be formed of a member having no flexibility or low flexibility, and the bellows portion 120 can be provided.

The deaeration prevention valve device 18 in the present embodiment has a frame portion 14 that is detachably attached to the mouthpiece body 11.
With this configuration, the deaeration prevention valve device 18 can be attached to and detached from the mouthpiece body 11. For this reason, for example, after endoscopic examination of the middle and lower pharynx is performed in an airtight state, the deaeration prevention valve device 18 can be removed, and another endoscopic examination such as the esophagus and stomach can be subsequently performed.
That is, when an examination of the esophagus and stomach is performed following the examination of the middle and lower pharynx where airtightness is important, it is not necessary to ensure airtightness so that the patient can fully breathe. On the other hand, according to the said structure, the presence or absence of ensuring airtightness is controllable suitably by attachment or detachment of the deaeration prevention valve apparatus 18 with respect to the mouthpiece main body 11. FIG.
More specifically, in general, in the examination of the esophagus and stomach, it is not necessary to ensure airtightness unlike the examination of the middle and lower pharynx by the Valsalva method described above. It is envisaged that the patient will be able to breathe well. However, if the field of view necessary for gastric observation cannot be obtained even if air is supplied through an endoscope, the air leakage from the mouth can be minimized by installing the deaeration prevention valve device 18 again. , Securing a field of view. Thus, the deaeration prevention valve device 18 can be attached to and detached from the mouthpiece main body 11, so that the deaeration prevention valve device 18 is arbitrarily attached according to the endoscopy situation or the patient's situation. The non-wearing can be selected.

The frame portion 14 can take various shapes according to the attachment position of the mouthpiece body 11. The frame portion 14 in the present embodiment has a substantially cylindrical shape.
An elastic part 16 is provided on the inner surface of the frame part 14. The frame part 14 and the expansion / contraction part 16 are formed by separate members, and the member constituting the frame part 14 is harder than the member constituting the expansion / contraction part 16. The expansion / contraction part 16 may be directly fixed to the frame part 14 in addition to the aspect fixed to the frame part 14 by the fixing ring 59. Or the aspect fixed to the arbitrary arbitrary members provided in the frame part 14 and provided in the frame part 14 may be sufficient.

The frame part 14 can be attached to and detached from the mouthpiece body 11 by using a relatively hard material. Specifically, examples of the material of the frame portion 14 include hard vinyl chloride resin, polyurethane resin, hard polyurethane resin, polyethylene resin, polyamide resin, polypropylene resin, polyacetal resin, fluorinated polyethylene resin, and acrylonitrile-butadiene-styrene. Polymer (ABS) resin or the like can be used.

The stretchable part 16 is preferably made of a material having flexibility as compared with the frame part 14. Specifically, the material of the stretchable portion 16 is preferably a stretchable material such as natural rubber, synthetic rubber, polyurethane elastomer, styrene-butadiene-styrene terpolymer, silicone rubber, and the like. It is also preferable to use the above-mentioned material containing oil in order to improve the friction with the stretchable part 16.

In this embodiment, the attachment / detachment of the deaeration prevention valve device 18 with respect to the mouthpiece body 11 is realized as follows.
That is, the frame portion 14 includes a locking portion 24 that detachably locks the frame portion 14 to the proximal end of the mouthpiece body 11 (see FIGS. 1 to 3).
The locking portion 24 in the present embodiment is provided on the circumference of the outer edge of the frame portion 14. The locking portion 24 extends along the outer edge of the frame portion 14 beyond the upper and lower ends of the outer edge. The lower end 23 extending beyond the lower end of the frame portion 14 of the locking portion 24 is provided with an engaging protrusion 22 (locking means) protruding toward the inside of the frame portion 14 (FIG. 2). And FIG. 3). The engagement protrusion 22 is a proximal end portion of the mouthpiece body 11 and engages with the outer surface. The mouthpiece body 11 is provided with an annular engagement receiving portion 54 that is continuous from the proximal end of the reduced diameter portion 110 and extends radially outward (FIGS. 6 and 7). The deaeration prevention valve device 18 is attached to the mouthpiece 100 by the engagement protrusion 22 engaging with the engagement receiver 54.
In addition, the up-down direction here makes the proximal end side of the mouthpiece 100 upward, and makes the distal end side downward.
A knob portion 20 (finger hook portion) is provided on an upper end portion 25 that extends beyond the upper end of the frame portion 14 of the locking portion 24. The knob portion 20 is provided on the outer side surface at the upper end of the locking portion 24. When the finger is applied to the upper end of the locking portion 24 for attaching and detaching, finger sliding is prevented and operability is good. By pushing the upper end portion 25 of the locking portion 24 inward in the radial direction, the lower end portion 23 opens outward in the radial direction. Thereby, the engagement protrusion 22 can be engaged with or released from the engagement receiving portion 54.

By using a relatively hard material, the mouthpiece body 11 can secure the strength of the mouthpiece 100 and can sufficiently secure the inner diameter of the insertion hole 12 that is the lumen of the mouthpiece body 11. Specifically, the mouthpiece body 11 is made of hard vinyl chloride resin, hard polyurethane resin, polyethylene resin, polyamide resin, polypropylene resin, polyacetal resin, fluorinated polyethylene resin, acrylonitrile-butadiene-styrene copolymer (ABS) resin, or the like. These resin materials can be used. The mouthpiece main body 11 can be formed of a kind of resin material, and the type of material constituting each arbitrary location can be changed.
The mouthpiece body 11 may be formed of the same material as that of the frame portion 14 described above from the viewpoint of using a relatively hard material. At this time, the mouthpiece main body 11 and the frame portion 14 may be formed of the same kind of material or different kinds of materials having the same hardness.

The number of the locking portions 24 is not particularly limited, and may be arbitrarily determined as long as the deaeration prevention valve device 18 can be attached to and detached from the mouthpiece body 11. The mouthpiece 100 according to the present embodiment is provided with locking portions 24 at two locations that are substantially opposed to each other with the frame portion 14 therebetween. A finger can be applied to the outer surface of the two locking portions 24 that are substantially opposed to each other, or three or more locking portions 24 provided at arbitrary positions, and pressed inward. Thereby, the lower end part 23 of the latching | locking part 24 can be moved to an outward direction.
The locking portion 24 in the present embodiment is located on the outer surface of the mouthpiece body 11. Therefore, when the deaeration prevention valve device 18 is attached to the mouthpiece body 11, the range of motion of the endoscope in the lumen of the mouthpiece body 11 is not narrowed, and the operability of the endoscope is not impaired.

However, in the present invention, the mechanism for attaching / detaching the deaeration prevention valve device 18 to / from the mouthpiece body 11 is not limited to this. For example, the locking portion 24 may be provided on the circumference of the inner edge of the frame portion 14, and may be engaged with or fitted to any location on the inner side surface of the proximal end portion of the mouthpiece body 11 to perform the above attachment / detachment. Good.
Further, the attachment / detachment of the deaeration prevention valve device 18 in the present invention is not limited to the locking means. For example, a friction element such as silicone rubber having a predetermined friction coefficient provided on the frame portion 14 and a biasing member such as a spring that biases the friction element toward the outer peripheral surface or inner peripheral surface of the mouthpiece body 11 are provided. You may combine.

Next, the covering portion 28 provided around the tooth receiving portion 26 will be described.
As described above, the mouthpiece body 11 has the cylindrical tooth receiving portion 26 at the distal end portion.
The mouthpiece body 11 may further include a covering portion 28 that covers the outer periphery of the tooth receiving portion 26. The hardness of the covering portion 28 is lower than the hardness of the tooth receiving portion 26. Therefore, when the patient picks up the tooth receiving portion 26 from above the covering portion 28, it is possible to give the patient a favorable experience and maintain the strength of the tooth receiving portion 26.
Further, by forming the covering portion 28 with a flexible resin member such as silicone rubber, when the teeth are applied to the surface of the covering portion 28 and the tooth receiving portion 26 is gripped, the teeth slightly bite into the covering portion 28. The shift of the biting position is suppressed. Therefore, the mouthpiece is prevented from dropping from the mouth during the endoscopy.

By using a relatively soft material for the covering portion 28, when the patient hits the teeth from the outer peripheral surface, the covering portion 28 is given a good feeling of comfort, and the teeth are difficult to slip on the surface of the covering portion 28. Specifically, a highly elastic material such as silicone rubber, polyurethane elastomer, natural rubber, synthetic rubber, styrene-butadiene-styrene terpolymer is preferable.

In the description of the present invention, the term “hardness” means the hardness measured by a known means suitable for each component. For example, the hardness of an arbitrary configuration of the present invention formed of a resin member can be measured according to durometer hardness JIS K 6253.

The covering portion 28 in this embodiment is detachable from the mouthpiece body 11. As a result, a patient with a small mouth can remove the covering portion 28 to directly grip the tooth receiving portion 26 in order to reduce the diameter of the gripping portion. Further, by preparing two or more kinds of covering portions 28 having different thicknesses, it is possible to further finely adjust the diameter of the portion that the patient can hold according to the size of the patient's mouth.
However, the present invention does not exclude the covering portion 28 that cannot be repeatedly attached to and detached from the mouthpiece body 11 (that is, fixed to the tooth receiving portion 26).

The covering portion 28 in the present embodiment covers at least a region that is the tooth receiving portion 26 and is in contact with the teeth of the patient holding the mouthpiece body 11. For example, as shown in FIG. 5, the covering portion 28 may have an O-ring shape that covers the entire outer periphery of the tooth receiving portion 26.
The covering portion 28 can be formed of an elastic member that can be easily deformed from a predetermined shape and can be restored to the predetermined shape. If the covering portion 28 is formed of such an elastic member, for example, it can have a cylindrical shape with a substantially circular cross section, and can be in close contact with the tooth receiving portion 26 that is a cylindrical portion with an elliptical cross section. It is.
However, the shape of the covering portion 28 is not limited to the O-ring shape. For example, the covering portion 28 may have a C-shaped cross section when cut perpendicularly to the longitudinal direction.

The covering portion 28 has a second convex portion 50 protruding outward in the radial direction at the distal end portion of the covering portion 28 on the outer peripheral surface side. The second convex portion 50 functions as a tooth stopping portion when the patient hits the covering portion 28 with the tooth receiving portion 26 covered with the covering portion 28, and the mouthpiece 100 falls from the mouth. Can be prevented.

The tooth receiving portion 26 and the covering portion 28 in the present embodiment are in a relationship of engaging with each other, and are configured so that the covering portion 28 is not detached when the covering portion 28 covers the tooth receiving portion 26. .
That is, as shown in FIG. 3, the tooth receiving portion 26 has a convex portion 30 protruding outward in the radial direction at the distal end portion of the tooth receiving portion 26. The covering portion 28 has a small diameter portion 34 and a large diameter portion 32 on the inner peripheral surface side. In addition, the covering portion 28 has a step portion 37 that is formed by steps of the small-diameter portion 34 and the large-diameter portion 32 on the inner peripheral surface side, and whose diameter changes discontinuously.
The projecting portion 30 and the stepped portion 37 engage with each other, thereby preventing the covering portion 28 from shifting from the proximal end of the mouthpiece body 11 toward the distal end. In this embodiment, the convex part 30 and the level | step-difference part 37 are contact | abutting, and both position shift is prevented in the engaged state.

The covering portion 28 is provided with a small diameter portion 34 on the proximal end side and a large diameter portion 32 on the distal end side. The area | region of the large diameter part 32 becomes a recessed part with respect to the area | region of the small diameter part 34, and the convex part 30 of the tooth receiving part 26 is fitted to the concave part.
As shown in FIG. 3, the end surface 51 of the distal end of the covering portion 28 and the end surface 52 of the distal end of the tooth receiving portion 26 (that is, the distal end of the convex portion 30) are substantially in the same plane. .

As described above, the mouthpiece 100 includes the cylindrical tooth receiving portion 26 provided at the distal end portion of the mouthpiece main body 11 and the covering portion 28 that covers the outer periphery of the tooth receiving portion 26. In addition, the mouthpiece 100 has a flange 42 extending outward from an outer peripheral surface provided between the distal end portion and the proximal end portion of the mouthpiece body 11.
The mouthpiece 100 according to the present embodiment includes the shortest distance A from the proximal end portion of the back surface 210 of the collar portion 42 to the distal end of the mouthpiece body 11 and the length of the covering portion 28 in the longitudinal direction (covering portion 28. The length along the direction connecting the distal end and the proximal end of the mouthpiece body 11) is substantially the same. In addition, the back surface 210 of the collar part 42 means the surface of the back side of the collar part 42 when the mouthpiece 100 is seen from the proximal end side.
According to such a configuration, substantially the entire portion of the tooth receiving portion 26 where the patient applies teeth is covered with the covering portion 28. Therefore, the patient can experience the elasticity of the covering portion 28 in the same manner regardless of where the tooth is applied to the tooth receiving portion 26.
When the proximal end of the mouthpiece body 11 is set to the upper side and the distal end is set to the lower side, the proximal end portion of the collar portion 42 of the present embodiment is provided at a height position substantially equal to the boundary portion 112 described above. ing.

As shown in FIG. 3, the telescopic part 16 has an annular bellows part 120 that is concentric with the annular endoscope insertion part 17 and is provided with a trough part 116 and a peak part 114 in the radial direction. ing.
As understood from FIG. 4, the bellows part 120 is arranged coaxially with an inner circle 112 A surrounded by a boundary part 112 that is a boundary between the reduced diameter part 110 and the enlarged diameter part 111. The diameter of the outer edge 120A of the bellows portion 120 is larger than the diameter of the inner circle 112A.
The outer edge 120 A of the bellows part 120 refers to a peak part 114 or a valley part 116 that is located farthest from the center among the peak parts 114 or the valley parts 116 constituting the bellows part 120. In the present embodiment, the outer edge 120 A of the bellows portion 120 is a circle connecting the vertices of the outer peak portions 114 of the peak portions 114 provided concentrically and double.
The bellows portion 120 in the present invention can absorb strain generated in the telescopic portion 16 due to the movement of the endoscope in the radial direction. The bellows portion 120 is a peak portion or a concave valley portion that is convex in a direction different from the extending direction of the stretchable portion 16. The apex of the peak or valley includes both an acute angle and an obtuse angle.
The bellows part 120 can be constituted by, for example, at least one peak part 114 or at least one valley part 116 provided in the stretchable part 16. Alternatively, the bellows part 120 may be composed of two or more adjacent peak parts 114 and valley parts 116. Alternatively, the bellows part 120 may have a flat part (not shown) between the peak part 114 and the valley part 116. The flat portion is included in a plane in a direction substantially perpendicular to the insertion direction of the insertion hole 12.

The present invention has a non-accordion portion around the endoscope insertion portion 17 and further has a bellows portion around the non-accordion portion, and a non-accordion portion around the endoscope insertion portion 17. Any of the embodiments in which the bellows portion 120 is disposed in contact with the endoscope insertion portion 17 is also included. For example, although not shown in the drawings, the present invention includes a mode in which the endoscope insertion portion 17 has a flat portion that is a non-accordion portion and the bellows portion 120 is provided around the flat portion.
The mouthpiece 100 according to this embodiment does not have a non-accordion portion around the endoscope insertion portion 17, and the bellows portion 120 is disposed in contact with the endoscope insertion portion 17.

Since the diameter of the outer edge 120A of the bellows portion 120 is larger than the diameter of the inner circle 112A, it is possible to provide excellent operability and airtightness when operating the endoscope (particularly parallel operation). Specifically, with this configuration, the bellows portion 120 can satisfactorily absorb the strain generated in the stretchable portion 16 due to the movement of the endoscope inside the inner circle 112A. Further, the endoscope insertion portion 17 that is in close contact with the peripheral surface of the endoscope satisfactorily follows the movement of the endoscope when the endoscope is operated. Therefore, the state where the endoscope and the endoscope insertion portion 17 are in close contact with each other is well maintained, and the gap between the endoscope and the mouthpiece body 11 is sealed with high airtightness.

In particular, when the diameter of the inner edge 120B of the bellows portion 120 is smaller than the diameter of the inner circle 112A, it is possible to provide excellent operability and airtightness when operating the endoscope (particularly parallel operation). The effect is remarkable.
In particular, the diameter of the inner edge 120B of the bellows part 120 is smaller than the diameter of the inner circle 112A, and the above-described non-bellows part is not provided between the endoscope insertion part 17 and the inner edge 120B, or the non-bellows It is preferable that it is an aspect which has a part but few.
In such a configuration, when the endoscope inserted through the endoscope insertion portion 17 is operated, the strain due to the movement of the endoscope is quickly absorbed by the bellows portion 120. Therefore, the bellows part 120 can be deformed before the endoscope insertion part 17, and the airtightness between the endoscope insertion part 17 and the endoscope can be maintained high.

The mouthpiece body 11 and the deaeration prevention valve device 18 described above may constitute a mouthpiece kit for endoscopy in a state where they are separated from each other.
Alternatively, the mouthpiece body 11, the anti-aeration valve device 18, and the covering portion 28 may constitute an endoscopic examination mouthpiece kit in a state of being separated from each other.
The above-mentioned mouthpiece kit for endoscopy is combined in use to constitute the mouthpiece of the present invention.

<Second embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a perspective view showing an example of a mouthpiece 200 according to the second embodiment of the present invention. FIG. 9 is an exploded perspective view of the mouthpiece 200 shown in FIG. FIG. 10 is a YY sectional view of the mouthpiece 200 shown in FIG.

The mouthpiece 200 has a mouthpiece body 61 having an insertion hole 12 through which an endoscope (not shown) can be inserted and removed freely, and the endoscope inserted through the insertion hole 12 and the mouthpiece body 61 are airtight. And a deaeration preventing valve device 418 for sealing.
The deaeration prevention valve device 418 includes a frame part 414, an expansion / contraction part 16 (extension / contraction means), and an endoscope insertion part 17.

The frame part 414 includes a locking part that detachably locks the frame part 414 to the proximal end of the mouthpiece body 61. Specifically, the locking portion is a fitting convex portion 422 (locking means) convex in the radial direction on the outer surface of the distal end portion of the frame portion 414. In the present embodiment, two fitting protrusions 422 are provided at opposing positions, but the present invention is not limited to this, and the number of fitting protrusions 422 may be one, or three or more.
The mouthpiece 200 has the same configuration as the mouthpiece 100 except that the configuration of the locking portion is different from that of the mouthpiece 100. Therefore, regarding the mouthpiece 200, description of other configurations other than the locking portion is omitted.

An engagement receiving portion 420 is provided on the proximal end side of the mouthpiece main body 61 with respect to the collar portion 42. The engagement receiving part 420 has a fitting part that can be engaged with the fitting convex part 422. In addition, the up-down direction mentioned regarding description of a fitting part is a paper surface up-down direction in FIG.
Specifically, the engagement receiving part 420 is a cylinder part 421 that stands up from the surface on the proximal end part side of the flange part 42, and has a fitting recess 425 as a fitting part on the side surface of the cylinder part 421. A fitting retaining portion 426 is provided.
The fitting recess 425 is a groove-like recess formed from the upper end to the lower end on the inner wall surface of the cylindrical portion 421. The width dimension of the fitting recess 425 is equal to or greater than the width dimension of the fitting protrusion 422. By fitting the fitting convex portion 422 from the upper end of the fitting concave portion 425 and guiding the fitting convex portion 422 in the lower end direction of the fitting concave portion 425, the mouthpiece body 61 and the deaeration prevention valve device 418 Can be engaged.
As a result of the engagement, the outer surface of the frame portion 414 faces the inner surface of the cylindrical portion 421, and the frame portion 414 is built in the engagement receiving portion 420.

The fitting retaining portion 426 is a concave portion that is continuous with the fitting concave portion 425 and extends in a direction different from the extending direction of the grooves constituting the fitting concave portion 425.
The fitting retaining portion 426 is continuous with the lower end of the fitting recess 425 and extends in a direction substantially perpendicular to the extending direction of the fitting recess 425. In a state where the fitting convex portion 422 is fitted to the lower end of the fitting concave portion 425, the fitting convex portion 422 is fitted to the fitting retaining portion 426 by twisting the frame portion 414 and the mouthpiece body 61 in the left-right direction on the paper surface. Can be combined. As a result, the fitting convex portion 422 is difficult to come out upward, and the deaeration prevention valve device 418 and the mouthpiece body 61 are stably fixed so as to be detachable.

The description of the locking part in the mouthpiece 100 and the mouthpiece 200 described above shows an example of the locking part of the present invention, and does not limit the present invention.

<Third embodiment>
Next, a third embodiment of the present invention will be described with reference to FIGS.
The mouthpiece 300 for endoscopy according to the present embodiment (hereinafter also simply referred to as mouthpiece 300) is different from the mouthpiece 100 for endoscopy according to the first embodiment in the points described below. In other respects, the configuration can be the same as that of the mouthpiece 100 for endoscopy, and the description thereof will be omitted as appropriate.
FIG. 11 is an exploded perspective view of the mouthpiece 300 according to the third embodiment of the present invention. 12 is a ZZ cross-sectional view of the mouthpiece 300 shown in FIG.

The mouthpiece 300 is the same as the mouthpiece 100 for the deaeration prevention valve device 18 and the mouthpiece body 11, and the covering portion 29 is different from the covering portion 28 provided on the mouthpiece 100.
The covering portion 29 in this embodiment has a cylindrical shape having an outer diameter having a major axis 310 and a minor axis 320.
In the present embodiment, the second protrusion 50 includes a first extension 312 extending on the major axis 310 with a first length 311 and a second extension extending on a minor axis with a second length 321. Part 322.
The covering portion 29 is configured such that the first length 311 is larger than the second length 321.

The covering part 29 has a long outer shape in at least one of the cross sections. The shape of the cross section includes an ellipse and an ellipse. By aligning the long axis 310 in the mouth angle direction and holding the mouthpiece 300 in a state where the proximal side of the second convex portion 50 is included in the oral cavity, the first extension portion 312 is placed between the cheek and teeth. Located between them, breath leakage from the corner of the mouth is prevented.
Moreover, since the 2nd extension part 322 is shorter than the 1st extension part 312, it is easy to fit between lips and teeth.

From the viewpoint that the patient can easily hold the mouthpiece 300, the second convex portion 50 is preferably provided at the distal end portion of the covering portion 29, and more preferably provided at the distal end as in this embodiment. preferable.

In the covering portion 29 in the present embodiment, as shown in FIG. 11, the first extending portion 312 and the second extending portion 322 are continuous in the outer peripheral direction. From the top view, the first extension 312 includes an extension of the major axis 310, and the second extension 322 includes an extension of the minor axis 320. However, the present invention is not limited to this, and although not illustrated, the first extending portion 312 and the second extending portion 322 may be provided discontinuously in the circumferential direction of the tooth receiving portion 26. The second extension 322 can contact the back of the patient's teeth and prevents the mouthpiece 300 from falling out of the oral cavity. However, in the present embodiment, the extension portion extending outward from the second protrusion 50 may be substantially only the first extension portion 312 and the second extension portion 322 may be omitted. In the 2nd convex part 50, when the 1st extension part 312 contact | abuts to a cheek back, it is possible to prevent that the mouthpiece 300 falls out from the inside of the oral cavity.

The first length 311 is a dimension in the extending direction of the second convex portion 50 measured along the extension line of the long axis 310 from the outer peripheral surface of the tooth receiving portion 26. The second length 321 is a dimension in the extending direction of the second convex portion 50 measured along the extension line of the short axis 320 from the outer peripheral surface of the tooth receiving portion 26.

The ratio between the first length 311 and the second length 321 is not particularly limited. For example, the first length 311 is preferably set to be twice or more the second length 321.
According to such a ratio, the length of the first extension portion 312 (first length 311) is provided long enough to exert the effect of preventing breath leakage, and the second extension arranged on the back of the lips. The length of the existing portion 322 (second length 321) can be appropriately shortened. Thereby, the 2nd convex part 50 provided with the 1st extension part 312 and the 2nd extension part 322 has good insertion property in an oral cavity, and the balance in an intraoral area is aimed at, and the discomfort to a patient is felt. Can be reduced.
More specifically, for example, in the mouthpiece 300 used for adults, it is preferable that the first length 311 is in the range of 5 mm to 10 mm and the second length 321 is in the range of 2 mm to 5 mm. .
At this time, the outer diameter of the covering portion 29 can be, for example, a major axis in the major axis 310 direction in the range of 30 mm to 40 mm and a minor axis in the minor axis 320 direction in the range of 25 mm to 35 mm.
By making the ratio of the first length 311 to the second length 321 larger than the ratio of the major axis to the minor axis of the covering portion 29, the patient can easily hold the mouthpiece 300 and breathe out. The effect of preventing is high.

In the mouthpiece 300, the long axis direction of the collar portion 42 and the extending direction of the first extending portion 312 are orthogonal to each other. Therefore, when the patient holds the mouthpiece 300, the buttocks 42 abut against the patient's lips to prevent the mouthpiece 300 from entering the oral cavity, and the first extension 312 abuts the cheek back. This prevents the mouthpiece 300 from falling out of the oral cavity.
As shown in FIG. 11, the second projecting portion 50 is provided with a second extending portion 322 orthogonal to the first extending portion 312. The mouthpiece 300 is well prevented from falling out of the oral cavity by the second extending portion 322 abutting on the upper and lower teeth and the first extending portion 312 contacting the cheek back.

As shown in FIGS. 11 and 12, the first extending portion 312 in the present embodiment is formed thin toward the outer edge.
In other words, the proximal side surface of the first extending portion 312 is inclined so as to taper toward the outer edge of the second convex portion 50.
Thus, by forming the first extension portion 312 to be thin, flexibility is imparted to the first extension portion 312, and it is possible to reduce a sense of discomfort in the oral cavity when the mouthpiece 300 is held. .
From this point of view, the inclination may be provided on the distal side surface of the first extension portion 312. However, it is preferable that the proximal side surface of the first extending portion 312 that can hit the cheek back is inclined toward the outer edge, so that the way of hitting the cheek back can be made softer.

From the viewpoint of imparting flexibility to the first extension portion 312, FIG. 13 shows a modification of the present embodiment. FIG. 13 is a perspective view of the mouthpiece body 11 as viewed from the back side with the covering portion 29A used in a modification of the third embodiment of the present invention.

As shown in FIG. 13, the covering portion 29 A is communicated with the insertion hole 12 provided in the mouthpiece main body 11 on the distal side surface of the first extending portion 312, and is thinned leaving the outer periphery 313. The thinned region is thinner than the surrounding region, and as a result, the flexibility of the first extension portion 312 is enhanced. From such a viewpoint, although not shown in the drawings, the above-described thinning may be performed on the proximal side surface of the first extension portion 312.

Here, the term “thinning” refers to providing a portion having a smaller thickness than the surroundings in the thickness direction, and the concave portion 314 is formed by thinning the distal side surface of the first extending portion 312. The recess 314 communicates with the insertion hole 12 and terminates on the inner surface of the outer periphery 313.
When the distal side is the upward direction, the height of the outer periphery of the thinned region (concave portion 314) is higher than the distal opening of the insertion hole 12, and the thinned region is It communicates with the opening.

From the viewpoint of softening the contact of the first extension part 312 against the back of the cheek and reducing the uncomfortable feeling in the oral cavity, as shown in FIGS. 11 and 12, the outer edge 315 of the proximal side surface of the first extension part 312. It is preferable to chamfer.
The chamfering includes both so-called C chamfering and R chamfering.

Next, the relationship between the covering portion 29 and the tooth receiving portion 26 will be described.
As shown in FIG. 11, the inner diameter of the tooth receiving portion 26 has a major axis and a minor axis in the same direction as the outer diameter of the covering portion 29. The inner shape of the cross section of the covering portion 29 is, for example, an ellipse or an ellipse, and is configured in a shape substantially equal to the outer shape of the tooth receiving portion 26. Therefore, the mounting direction of the covering portion 29 with respect to the tooth receiving portion 26 can be easily understood.
In the present embodiment, each of the major axis and the minor axis at the inner diameter of the covering portion 29 is formed slightly larger than the major axis and the minor axis at the outer diameter of the tooth receiving portion 26.

The covering portion 29 according to the present embodiment includes a convex contact portion 316 that is continuous in a circumferential direction in contact with the outer peripheral surface of the tooth receiving portion 26 on the inner peripheral surface.
By providing the contact portion 316, the space between the outer peripheral surface of the tooth receiving portion 26 and the inner peripheral surface of the covering portion 29 is sealed by the contact portion 316, so that the airtightness of the mouthpiece 300 is increased. .
Moreover, compared with the case where the outer peripheral surface of the tooth receiving portion 26 and the inner peripheral surface of the covering portion 29 are brought into direct contact without providing the contact portion 316, this embodiment significantly reduces the contact area between the two. Can do. For this reason, when the covering portion 29 is attached to the tooth receiving portion 26, when the attachment position is shifted, the covering portion 29 is rotated in the circumferential direction, and the attachment position can be easily adjusted.

The contact portion 316 in the present embodiment is a single band-shaped body that protrudes inward in the radial direction and that circulates in the circumferential direction in which the protruding tip is hemispherical. However, the contact portion 316 is not limited to this, and two or more contact portions 316 that circulate in the circumferential direction may be provided, and the protruding tip has a shape other than a hemisphere (for example, a planar shape). There may be. FIG. 12 shows a state where the abutting portion 316 having a hemispherical protruding tip abuts on the outer peripheral surface of the tooth receiving portion 26 and the tip is flat.
Further, the abutting portion 316 shown in the drawing circulates in the circumferential direction in a plane orthogonal to the central axis of the covering portion 29, but is not limited thereto.

In the mouthpiece 300 including the contact portion 316 described above, the airtightness between the tooth receiving portion 26 and the contact portion 316 can be 3 kPa or more.
The mouthpiece 300 that exhibits such airtightness is suitable for performing tests and treatments that increase the pressure in the oral cavity, such as the Valsalva method.

The airtightness between the tooth receiving portion 26 and the contact portion 316 is 3 kPa, which means that the outer peripheral surface of the tooth receiving portion 26 and the tip of the contact portion 316 are brought into close contact with each other and closer to the distal side of the contact portion 316. It means that gas does not leak between the tooth receiving portion 26 and the abutting portion 316 when a pressure difference of 3 kPa is applied to the rear side.
As an example, the endoscope is inserted in close contact with the endoscope insertion portion 17, sealed so as to cover the distal side of the mouthpiece 300 from the middle in the axial direction of the tooth receiving portion 26, and gas is inserted into the insertion hole 12. Air is supplied and the internal pressure is set to 3 kPa. At this time, it is possible to confirm that the airtightness between the tooth receiving portion 26 and the contact portion 316 is 3 kPa by preventing gas from leaking between the tooth receiving portion 26 and the contact portion 316. .

Although the present embodiment having the contact portion 316 has been described above, the present invention omits the contact portion 316 and directly contacts the outer peripheral surface of the tooth receiving portion 26 and the inner peripheral surface of the covering portion 29. Includes embodiments. In this case, the major axis and the minor axis of the inner diameter of the covering portion 29 are substantially the same as the major axis and the minor axis of the outer diameter of the tooth receiving portion 26, and the outer peripheral surface of the tooth receiving portion 26 and the covering portion 29. It is preferable that there is no gap communicating with the inner peripheral surface in the axial direction.

In the present embodiment, as shown in FIG. 13, a first positioning portion 323 and a second positioning portion 324 may be provided on the mouthpiece body 11 in order to easily attach the covering portion 29 A at an intended position.
That is, as shown in FIG. 13, the tooth receiving portion 26 (see FIG. 11) has a convex portion 30 protruding radially outward at the distal end portion of the tooth receiving portion 26, and the covering portion 29 A has an outer peripheral surface. On the side, it has the 2nd convex part 50 which protrudes in the radial direction outer side in the distal end part of 29 A of coating | coated parts. A first positioning portion 323 provided on the distal end surface of the convex portion 30 and a second positioning portion 324 provided on the distal end surface of the second convex portion 50 and facing the first positioning portion 323 are provided. . By attaching the covering portion 29A to the mouthpiece body 11 so that the first positioning portion 323 and the second positioning portion 324 are opposed to each other, the positioning of the covering portion 29A with respect to the mouthpiece body 11 is easy and reliable.
At least one set of the first positioning part 323 and the second positioning part 324 is provided. In FIG. 13, a first positioning portion 323 and a second positioning portion 324 facing the first positioning portion 323 are provided at each of two locations where the convex portion 30 and the second convex portion 50 are closest to each other.
The first positioning portion 323 and the second positioning portion 324 are appropriately implemented in various aspects of the mouthpiece of the present invention having the convex portion provided in the tooth receiving portion and the second convex portion provided in the covering portion. can do.

<Fourth embodiment>
The mouthpiece for endoscopy according to the fourth embodiment is different from the mouthpiece for endoscopy 100 according to the first embodiment in the points described below, and in other respects the endoscopy Since it can be configured in the same manner as the mouthpiece 100 for a product, description thereof will be omitted as appropriate.
In order to explain the changes from the first embodiment, a perspective view of the mouthpiece body 11 and the covering portion 35 used in the fourth embodiment is shown in FIG.

The mouthpiece for endoscopy in the fourth embodiment has a covering portion 35 that covers the outer periphery of the tooth receiving portion 26. The proximal end surface 351 of the covering portion 35 and the distal side surface 352 of the collar portion 42 are configured to have shapes corresponding to each other.

More specifically, in the mouthpiece for endoscopy in the fourth embodiment, the distal side surface 352 of the collar portion 42 (the back surface of the collar portion 42) and the proximal end surface 351 of the covering portion 35 are fitted to each other. It has a concavo-convex portion 353 provided non-circularly.
In FIG. 14, the proximal end surface 351 is convex, and the distal side surface 352 corresponding to the proximal end surface 351 is concave, and these are fitted to each other to form an uneven portion 353. Of course, the proximal end surface 351 (not shown) may be concave, and the distal side surface 352 corresponding to this may be convex.

The uneven portion 353 is provided at least at one place, preferably at two or more places. In the present embodiment, a similar concavo-convex portion 353 is provided so as to face approximately 180 ° (not shown).
Since the uneven portion 353 is non-circular, the covering portion 35 is difficult to rotate in the circumferential direction when the proximal end surface 351 and the distal side surface 352 having shapes corresponding to each other are fitted in the correct direction. Therefore, the covering portion 35 can be properly aligned with the tooth receiving portion 26.

<Fifth embodiment>
Hereinafter, the deaeration prevention valve device of the present invention used for an endoscope mouthpiece will be described in detail based on preferred embodiments shown in the accompanying drawings.

Hereinafter, embodiments of the deaeration prevention valve device of the present invention will be described with reference to the drawings.

15 is a perspective view in which the deaeration prevention valve device according to the fifth embodiment of the present invention is mounted on an endoscope mouthpiece. The lower view of FIG. 15 is a perspective view before the deaeration prevention valve device and the endoscope mouthpiece according to the fifth embodiment of the present invention are mounted. FIG. 16 is a cross-sectional view in which the deaeration prevention valve device according to the fifth embodiment of the present invention is attached to an endoscope mouthpiece. FIG. 17 is a front view of a deaeration prevention valve device according to a fifth embodiment of the present invention. FIG. 18 is a plan view of a deaeration prevention valve device according to the fifth embodiment of the present invention. 19 is a cross-sectional view taken along the line BB in FIG. FIG. 20 is a rear view of the deaeration prevention valve device according to the fifth embodiment of the present invention.

The deaeration prevention valve device 501 of the present embodiment has an insertion hole 562 through which an endoscope (not shown) can be inserted and removed freely, and a proximal end of a mouthpiece 504 (mouthpiece body) that is inserted into the oral cavity. The unit 543 is detachably attached.
A frame portion 503 attached to the base end portion 543 of the mouthpiece 504, a locking portion 502 provided on the frame portion 503 and removably locked to the base end portion 543, and provided inside the frame portion 503. And a valve body portion 505.
The valve body portion 505 of the present embodiment is provided at an approximately central portion of the valve body portion 505 and is provided around the endoscope insertion portion 506 and an annular endoscope insertion portion 506 that is attached to the endoscope. Flexible expansion / contraction means 508.

Hereinafter, the deaeration prevention valve device 501 of the present embodiment will be described in more detail.
As shown in FIGS. 15 and 16, the deaeration prevention valve device 501 of this embodiment is attached to a mouthpiece 504 to be inserted into the oral cavity, and more specifically, an external body 544 of the mouthpiece 504. It is attached to a base end portion 543 provided on the base end side.
And the latching | locking part 502 of the deaeration prevention valve apparatus 501 latches to the base end part 543 of the mouthpiece 504 so that engagement / disengagement is possible by the latching means 521 which protruded toward the inner side of the flame | frame part 503.

The mouthpiece 504 includes a body exterior 544, a buttocks 545, and an oral cavity interior 546, and an outer surface of the oral cavity interior 546 is detachably covered with a cover 549 made of an elastic material.
The buttocks 545 are in contact with the lip surface and serve to prevent excessive insertion of the mouthpiece. With the buttocks 545 as a boundary, the proximal end side is the body exterior 544 and the distal end side is the mouth interior 546. Yes.
The oral cavity interior 546 has a lumen 542 that is inserted into the oral cavity and through which the endoscope can be inserted and removed via the mouthpiece 504, and includes a first opening 547 on the endoscope insertion side and a second mouth inner outlet. An opening 548 is provided.
The external body 544 only needs to have a lumen 542 into which the endoscope can be inserted and removed, and the base end portion 543 of the external body 544 can take various shapes, but from the viewpoint of the insertion property of the endoscope, it is typical. It has a circular funnel shape.
That is, as shown in FIG. 16, the external body 544 of the mouthpiece 504 to which the deaeration prevention valve device 501 of this embodiment is attached has a tapered diameter-enlarged portion 541 whose diameter gradually increases toward the base end side. Accordingly, a base end portion 543 is provided on the base end side.
In this embodiment, the base end portion 543 of the mouthpiece 504 is a proximal end side region having a predetermined length, and the base end portion 543 includes a tapered diameter-enlarged portion 541.

However, the mouthpiece 504 to which the deaeration prevention valve device 501 is attached is not limited to the above. For example, instead of the enlarged diameter portion 541 whose diameter gradually increases toward the proximal end side, it may be a simple cylindrical portion.

As shown in FIGS. 15 to 17, the frame portion 503 of the deaeration prevention valve device 501 is a frame body attached to the base end portion 543.
The frame portion 503 can take various shapes according to the shape of the proximal end portion 543 of the mouthpiece 504, but in the present embodiment, has a substantially cylindrical shape. The frame portion 503 is integrally formed with an inward flange-shaped fixing portion 531 with a predetermined width.

The valve body portion 505 is a flexible member that is airtightly attached to the endoscope, and is provided on the inner surface of the frame portion 503. More specifically, the valve body portion 505 is manufactured in a substantially disk shape as a separate member from the frame portion 503, and is mounted inside the cylindrical frame portion 503 and fixed to the fixing portion 531.

An annular endoscope insertion portion 506 having a substantially circular insertion hole 562 is provided at a substantially central portion of the valve body portion 505. The endoscope insertion part 506 is elastically deformable, and the endoscope is inserted into the insertion hole 562 so as to be freely inserted and removed, and the endoscope insertion part 506 is tightly sealed around the endoscope. .

An expansion / contraction means 508 (expansion / contraction part) is formed on the outer peripheral edge of the endoscope insertion part 506. The expansion / contraction means 508 can move the endoscope insertion portion 506 in the radial direction (left-right direction in FIG. 17), the forward / backward direction (up-down direction in FIG. 17), and the rotation direction (twist direction or swing direction of the endoscope). It is a flexible member. The expansion / contraction means 508 may have a flat plate shape or a bellows shape, but preferably includes a bellows shape from the viewpoint of further improving the movement of the endoscope insertion portion 506 in the above direction. According to the deaeration prevention valve device 501 of the present embodiment, by providing the expansion / contraction means 508, the valve body portion 505 is deformed following the endoscope. For this reason, when an operator moves the endoscope inserted through the lumen 542 of the mouthpiece 504, the operability of the endoscope is not impaired.
A closing plug portion 554 (see FIGS. 17 and 20) that fits with the opening on the proximal end side of the lumen 542 of the mouthpiece 504 and hermetically seals the opening on the outer peripheral edge of the valve body 505. ) Is formed integrally with the expansion / contraction means 508.

The deaeration prevention valve device 501 of this embodiment is detachably attached to the proximal end portion 543 of the mouthpiece 504 by operating the locking portion 502.
The locking portion 502 is provided on the circumference of the outer edge of the frame portion 503.

The deaeration prevention valve device 501 of the present embodiment engages a locking means (locking claw; locking protrusion) 521 protruding toward the inside of the frame portion 503 with respect to the base end portion 543 of the mouthpiece 504. (See FIG. 16).
The locking means 521 of the present embodiment is formed at the tip of the locking portion 502 that protrudes in the axial direction and distally from the cylindrical frame portion 503.
However, the present invention is not limited to this, and although not shown in the figure, the locking means 521 may be formed on the inner peripheral surface of the cylindrical frame portion 503, for example, on the outer peripheral surface from the axial direction. A locking portion 502 may be formed so as not to protrude.

The deaeration prevention valve device 501 of the present embodiment is detachably attached to the base end portion 543 of the mouthpiece 504 using a locking portion 502 that is detachably locked to the base end portion 543 of the mouthpiece 504. Installed. That is, the deaeration prevention valve device 501 of this embodiment is attached to the outside of the mouthpiece 504. For this reason, even if the deaeration prevention valve device 501 is attached to the mouthpiece 504, the movable range of the endoscope in the lumen 542 of the mouthpiece 504 is not narrowed, and the operability of the endoscope is not impaired. .

Further, in a state where the deaeration prevention valve device 501 is attached to the mouthpiece 504, the proximal end of the lumen 542 is airtightly held by the valve body portion 505 that is worn around the endoscope. For this reason, even if the endoscope inserted through the lumen 542 is moved back and forth, left and right, etc., it is possible to reduce leakage of pressurized air supplied into the body cavity to the proximal end side of the mouthpiece 504. Can do. Therefore, the larynx can be raised by the Valsalva method and the visual field of the hypopharynx can be secured.

Furthermore, the deaeration prevention valve device 501 can be detached from the mouthpiece 504. After the observation of the middle and lower pharynx, when the esophagus and stomach are subsequently examined, the deaeration prevention valve device 501 is removed from the mouthpiece 504 while the endoscope is inserted into the lumen 542. Can do. Thus, following the examination of the middle and lower pharynx by the Valsalva method, which requires airtightness, the esophagus and stomach can be examined without replacing the mouthpiece.

In general, in the examination of the esophagus and stomach, it is not necessary to ensure airtightness unlike the examination of the middle and lower pharynx by the Valsalva method described above, so it is assumed that the deaeration prevention valve device 501 is removed. . However, if the field of view necessary for gastric observation cannot be obtained even if air is fed through an endoscope, the air leakage from the mouth can be minimized by installing the deaeration prevention valve device 501 again. , Securing a field of view. Thus, the deaeration prevention valve device 501 can be attached to and detached from the mouthpiece 504, so that the deaeration prevention valve device 501 can be arbitrarily attached according to the status of the endoscopy or the condition of the subject. Non-wearing can be selected.

The locking portion 502 has a finger hook portion 522 (knob portion) formed integrally with the locking means 521. The finger hook portion 522 is a portion that the operator opens and closes in a closed state in which the locking means 521 can be locked to the enlarged diameter portion 541 or an open state in which the locking means 521 can be detached from the enlarged diameter portion 541.

As shown in FIG. 17, the locking part 502 has a locking means 521 at the lower part (distal side) and a finger hooking part 522 at the upper part (closer to the proximal side). The frame portion 503 is joined at a joint portion 523 that is in the middle of the portion 522. As shown in FIG. 16, the joint portion 523 is movably joined to the frame portion 503. In a state where no external force is applied to the finger hook portion 522 (closed state), the locking means 521 and the locking means 21 that face each other via the mouthpiece 504 are fitted to the outer surface of the base end portion 543 of the mouthpiece 504 to deaerate. A prevention valve device 501 is attached to the mouthpiece 504. By tilting the finger hook portion 522 in the direction of the central axis of the frame portion 503 with a finger, the distance between the locking means 521 and the locking means 521 facing each other increases, and the distance is larger than the outer diameter of the proximal end portion 543 of the mouthpiece 504 Is also in a largely open state (open state) (not shown). Accordingly, the locking means 521 can pass through the proximal end portion 543 of the mouthpiece 504, and the deaeration prevention valve device 501 can be detached from the mouthpiece 504.

The number of the locking portions 502 is not particularly limited, and may be one or two or more.
In the deaeration prevention valve device 501 of the present embodiment, as shown in FIG. 15, the locking portions 502 are provided at two or more locations around the frame portion 503 so as to be separated from each other.

More specifically, the locking portion 502 of this embodiment is formed at two locations facing each other with respect to the central axis of the cylindrical frame portion 503.
In addition, three locking portions 502 may be formed at an angular interval of 120 degrees with respect to the central axis of the frame portion 503, or four locking portions at an angular interval of 90 degrees with respect to the central axis. 502 may be formed. Further, the locking portion 502 may be provided only at one place on the circumference of the frame portion 503. That is, the deaeration prevention valve device 501 is fixed to the base end portion 543 of the mouthpiece 504 with one locking portion 502 and the frame portion 503, and the deaeration prevention valve device 501 is fixed to the mouthpiece by opening the locking portion 502. It may be possible to detach from 504.

When the operator operates the endoscope with one hand, it is preferable that the deaeration prevention valve device 501 of this embodiment can be detached from the mouthpiece 504 with the other hand. In consideration of easiness, the number of the locking portions 502 is preferably three or less. Furthermore, from the viewpoint that the locking portion 502 can be opened by simply picking it with a finger, it is preferable to provide the locking portions 502 at two opposite locations on the circumference of the frame portion 503.

Hereinafter, the deaeration prevention valve device 501 of the present embodiment will be described in more detail. The locking portion 502 may be integrally formed with the frame portion 503, or may be formed as a separate member from the frame portion 503 and may be movably joined and fixed to the frame portion 503. When the locking portion 502 and the frame portion 503 are integrally formed, these materials are the same as the material of the frame portion 14 described in the first embodiment, and therefore specific listing is omitted here. In particular, when the locking portion 502 and the frame portion 503 are integrally formed, polyethylene resin, polyamide resin, or polypropylene resin is used from the viewpoint of the durability of the hinge of the joint portion 523 that is a fixing portion between the locking portion 502 and the frame portion 503. preferable.

When the locking portion 502 and the frame portion 503 are molded separately, the material of the locking portion 502 is not particularly limited, but it is necessary to withstand the strength of applying an external force to the finger hook portion 522 and tilting the locking portion 502 as a whole. A relatively hard material is desirable. The material of the locking portion 502 is the same as that of the frame portion 14 described in the first embodiment.

Further, when the locking portion 502 and the frame portion 503 are individually molded, the material of the frame portion 503 is not particularly limited. However, the material does not deform due to the external force applied to the locking portion 502, and the valve body portion 505 is sufficiently formed. It is preferable to have strength that can be fixed. Further, by using a relatively hard material for the frame portion 503, the inner diameter of the lumen 542 is sufficiently secured, and the operability of the endoscope is improved. The material of the frame part 503 is the same as that of the frame part 14 described in the first embodiment.

As shown in FIGS. 17 to 19, the deaeration prevention valve device 501 of the present embodiment has a fixing portion 531 for fixing the valve body portion 505 in an inward flange shape on one opening end surface of the cylinder of the frame portion 503. Have. The valve body portion 505 may be bonded and fixed to the fixing portion 531, or the valve body portion 505 may be sandwiched between the fixing portion 531 and another member.

As shown in FIGS. 17, 19, and 20, the deaeration prevention valve device 501 of this embodiment includes a substantially ring-shaped fixing member (fixing ring 507) that fixes the valve body portion 505 to the frame portion 503. ing.
The fixing ring 507 has a ring shape having an outer shape that can be accommodated inside the cylindrical frame portion 503, and the fixing ring 507 and the fixing portion 531 press and hold the outer peripheral edge of the valve body portion 505.
On the inner side of the cylinder of the frame portion 503, as shown in FIG. The claw 532 is a stopper that prevents the fixing ring 507 from falling off the frame portion 503. For example, the fixing ring 507 can be prevented from falling off by bringing the distal side surface of the fixing ring 507 into contact with the proximal side surface of the claw 532.

The material of the fixing ring 507 is not particularly limited, but the endoscope is provided by firmly fixing the valve body 505 to the frame portion 503 while thinning the entire deaeration prevention valve device 501 to improve the operability of the endoscope. It is preferable to have sufficient strength to withstand the frictional force between the valve body portion 505 and the valve body portion 505. Specifically, as the material of the fixing ring 507, the same material as that of the locking portion 502 or the frame portion 503 can be used.

The deaeration prevention valve device 501 of this embodiment includes a reinforcing member 509 between the outer peripheral edge portion of the endoscope insertion portion 506 and the inner peripheral edge portion of the expansion / contraction means 508.
The reinforcing member 509 is a member for increasing the elasticity of the endoscope insertion portion 506 as compared with the expansion / contraction means 508 and improving the adhesiveness with the endoscope.
The reinforcing member 509 of the present embodiment is integrally formed of a material common to the annular endoscope insertion portion 506. For example, as shown in FIG. 19, the reinforcing member 509 has a cross-sectional diameter of the reinforcing member 509 that is an O-ring larger than the thickness dimension of the expansion / contraction means 508. By using the reinforcing member 509 which is such an O-ring, the strength of the inner peripheral edge of the expansion / contraction means 508 can be reinforced and the adhesion between the endoscope and the deaeration prevention valve device 501 can be improved.

The reinforcing member 509 of the present embodiment is formed in an O-ring shape. As a result, the endoscope insertion portion 506 is evenly worn around the endoscope, so even if the endoscope is moved forward, backward, up, down, left and right, and rotated, the endoscope outer surface and the endoscope are inserted. Formation of a gap between the portion 506 is prevented.

The expansion / contraction means 508 has a bellows portion that expands and contracts in the circumferential plane direction of the insertion hole 562 of the endoscope insertion portion 506, as shown in FIG. For example, the bellows part can be constituted by an inclined part 583 that inclines in opposite directions to each other via the folded part 582. By attaching the bellows portion to the expansion / contraction means 508, stress applied to the endoscope insertion portion 506 can be relieved particularly when the endoscope is inserted and removed, and the endoscope can be smoothly inserted and removed. Even if the endoscope inserted into the insertion hole 562 is operated in all directions of forward / backward, up / down / left / right and rotation around the endoscope insertion portion 506, the bellows portion contracts or extends, There is no hindrance to the free movement of the endoscope. Further, since the bellows portion is more flexible than the endoscope insertion portion 506, the endoscope insertion portion 506 is displaced with respect to the frame portion 503 while being in close contact with the outer surface of the endoscope. Thereby, the clearance gap between the endoscope insertion part 506 and an endoscope can be minimized, and the airtightness of an endoscope and the deaeration prevention valve apparatus 501 can be maintained.

(First modification)
Next, a first modification of the fifth embodiment of the present invention will be described with reference to FIG.
Below, a 1st modification is demonstrated centering around difference with 5th embodiment, The description is abbreviate | omitted suitably about the matter similar to 5th embodiment.

FIG. 21 is a cross-sectional view of a deaeration prevention valve device 501 according to a first modification of the present invention.

As shown in FIG. 21, the expansion / contraction means 508 can make the peak portion and the valley portion (folded portion 582) of the bellows portion thinner than other flat portions (inclined portion 583). By doing so, the contraction or extension of the bellows part becomes softer, and friction with the endoscope can be reduced during insertion / extraction of the endoscope and operation of the endoscope, so that the operability of the endoscope is further improved. .

In the endoscope, in addition to the forward / backward movement and the up / down / left / right movement around the endoscope insertion portion 506, an operation of rotating the shaft around the endoscope insertion portion 506 is also performed. At this time, the endoscope insertion portion 506 rotates together with the endoscope due to the high elastic force of the thick inclined portion 583 in the bellows portion with respect to the axial rotation movement around the endoscope insertion portion 506. And curbing around this. And the endoscope insertion part 506 can follow suitably with respect to the back-and-forth, right-and-left movement of an endoscope with the low elastic force which the thin folding | turning part 582 in a bellows part has.

The inner diameter of the endoscope insertion portion 506 is equal to or smaller than the outer diameter of the endoscope inserted through the endoscope insertion portion 506.
More specifically, the inner diameter of the endoscope insertion portion 506 is preferably smaller than the outer diameter of the endoscope inserted therethrough in the range of 0 mm or more and 5 mm or less, and smaller in the range of 2 mm or more and 4 mm or less. More preferably. By making the inner diameter of the endoscope insertion portion 506 smaller than the outer diameter of the endoscope within the above range, resistance during insertion and removal of the endoscope can be suppressed, and the insertion of the endoscope insertion portion 506 with respect to the endoscope can be reduced. It is possible to achieve both adhesion. As a result, an appropriate frictional force is obtained between the endoscope and the endoscope insertion portion 506, so that air leakage from the lumen 542 when the endoscope is moved is prevented, and the endoscope It is possible to prevent the deaeration prevention valve device 501 from being detached from the mouthpiece 504 together with the endoscope during operation.

Since the material of the valve body part 505 is the same as the material of the expansion / contraction part 16 in the first embodiment, the example listing is omitted here.

(Second modification)
Next, a second modification which is another modification of the fifth embodiment will be described with reference to FIG.
Below, it demonstrates centering around difference with 5th embodiment about a 2nd modification, and the description is abbreviate | omitted suitably about the matter similar to 5th embodiment.

FIG. 22 is a cross-sectional view of a deaeration prevention valve device 501 according to a second modification of the present invention.

As shown in FIG. 22, in the deaeration prevention valve device 501 of this modification, the endoscope insertion portion 506 has a straight tube portion 565 extending in the thickness direction of the valve body portion 505.
The deaeration prevention valve device 501 of the present modification is the above embodiment (see FIG. 19) in that the endoscope insertion portion 506 is in close contact with the outer peripheral surface of the endoscope over a predetermined extension length. Is different.
The O-ring-shaped reinforcing member 509 is formed on the outer peripheral side of the straight tube portion 565, and the inner peripheral surface of the straight tube portion 565 has a cylindrical surface shape.

According to the deaeration prevention valve device 501 according to the present modification, the adhesion between the endoscope insertion portion 506 and the endoscope is improved, and the endoscope around the endoscope insertion portion 506 is attached to the lumen 542. In this case, the O-ring-shaped reinforcing member 509 does not roll and rotate with respect to the endoscope. This prevents a gap from being generated between the endoscope insertion portion 506 and the endoscope when the operator operates the endoscope.

<Sixth embodiment>
Next, a sixth embodiment of the present invention will be described with reference to FIGS. 23A to 23D.
In the following, the sixth embodiment will be described. However, differences from the fifth embodiment will be mainly described, and description of similar matters will be omitted.

FIG. 23A is a perspective view of the sixth embodiment before the deaeration prevention valve device 600 and the endoscope mouthpiece 640 are attached, and FIG. 23B is the attachment of the deaeration prevention valve device 600 to the endoscope mouthpiece 640. 23C is a cross-sectional view of the deaeration preventing valve device 600, and FIG. 23D is a cross-sectional view of the endoscope mouthpiece 640.

As shown in FIGS. 23A to 23D, the deaeration prevention valve device 600 has a locking portion (locking means; locking claw) 620 having a protruding convex shape. The locking part 620 is provided on the outer peripheral surface of the deaeration prevention valve device 600, for example, and protrudes outward in the radial direction. On the other hand, the mouthpiece 640 has a groove 631 on the lumen side of the proximal end 630, a hole 632 continuous with the groove 631 in the circumferential direction, and a protrusion on the proximal end of the hole 632. 633.
In the sixth embodiment, the deaeration prevention valve device 600 is installed in the base end portion 630 of the mouthpiece 640.
Specifically, the distal end side of the protruding locking portion 620 of the deaeration prevention valve device 600 is inserted from the proximal end side of the groove portion 631 of the base end portion 630 in the mouthpiece 640. The locking portion 620 is positioned in the insertion direction by contacting the collar portion 650 and then rotated in the circumferential direction, so that the locking portion 620 fits into the hole portion 423, and the vertical direction (distal side and proximal side) Direction). Furthermore, the locking portion 620 is fixed in the circumferential direction because of the protrusion 633.
Therefore, in the sixth embodiment, the deaeration prevention valve device 600 can be attached to and detached from the mouthpiece 640 by grasping an arbitrary portion of the outer surface of the deaeration prevention valve device 600 with a finger or the like.

The deaeration prevention device of the present invention described above can be used as appropriate as the deaeration prevention device provided in the endoscope mouthpiece of the present invention.
The endoscope mouthpiece of the present invention includes an endoscope mouthpiece comprising the endoscope mouthpiece and the deaeration prevention valve device of the present invention.
Each configuration of the deaeration prevention valve device in the endoscopic examination mouthpiece of the present invention described above and each configuration of the deaeration prevention valve device in the present invention may be appropriately transferred to each other.

The mouthpiece for endoscopy of the present invention described above and the mouthpiece for endoscope provided with the deaeration prevention valve device of the present invention are airtight between the deaeration prevention valve device and the mouthpiece body. The property can be 3 kPa or more. Such a mouthpiece that exhibits airtightness is suitably used for performing tests and treatments for increasing the pressure in the oral cavity, such as the Valsalva method.
The airtightness between the deaeration prevention valve device and the mouthpiece body is 3 kPa. The inside and outside of the joint surface between the mouthpiece body and the deaeration prevention valve device when the deaeration prevention valve device is attached to the mouthpiece body. Means that no gas leaks between the mouthpiece body and the deaeration preventive valve device when a pressure of 3 kPa is applied between them.

As an example, description will be made using a mouthpiece 504 to which a deaeration prevention valve device 501 shown in FIG. 16 is attached. The endoscope is inserted in close contact with the endoscope insertion portion 506 and sealed to cover the distal side of the mouthpiece 504 to which the deaeration prevention valve device 501 is attached from the middle in the axial direction of the cover 549. A gas is supplied into the interior of the chamber and the internal pressure is set to 3 kPa. At this time, it is confirmed that the airtightness between the mouthpiece 504 and the deaeration prevention valve device 501 is 3 kPa because gas does not leak from the joint surface between the mouthpiece 504 and the deaeration prevention valve device 501. be able to.
The desirable airtightness described above is, for example, deaerated in a state where the valve body portion 505 (see FIG. 17) and the base end portion 543 that are sandwiched by pressing the outer peripheral edge with the fixing ring 507 and the fixing portion 531 are in contact with each other. This can be realized by attaching the prevention valve device 501 to the mouthpiece 504.

The mouthpiece for endoscopy of the present invention enables proper breathing in endoscopic examination of the middle and lower pharynx using the Valsalva method, and it is possible to observe the affected area in detail by raising the larynx And
The mouthpiece for endoscopy of the present invention is not limited to the middle hypopharyngeal examination using the Valsalva method described above, and can be used for various oral endoscopy.
Of course, the mouthpiece for endoscopy according to the present invention does not exclude that it is used for purposes other than endoscopy, for example, in the case of treatment using an endoscope. Can be widely used as a piece.
The deaeration prevention valve device of the present invention is attached to the endoscope mouthpiece to prevent leakage from the oral cavity during operation of the endoscope and to be detached from the endoscope mouthpiece. Thus, the mouthpiece can be applied to an endoscope operation in which securing airtightness is not important.

The above embodiment includes the following technical idea.
(1) a mouthpiece body having an insertion hole through which an endoscope can be inserted and removed freely;
A deaeration preventive valve device that hermetically seals between the endoscope and the mouthpiece body inserted through the insertion hole;
A mouthpiece for endoscopy having an endoscope.
(2) The mouse for endoscopy according to (1), wherein the deaeration prevention valve device is provided around the insertion hole and is worn around the endoscope inserted through the insertion hole. piece.
(3) The deaeration prevention valve device has a flexible expansion and contraction portion provided around the insertion hole,
The endoscopic examination mouthpiece according to (1) or (2), wherein the extendable portion includes an endoscope insertion portion that is provided at a substantially central portion of the extendable portion and is attached to the endoscope.
(4) The mouthpiece for endoscopy according to any one of (1) to (3), wherein the deaeration prevention valve device has a frame portion that is detachably attached to the mouthpiece body.
(5) The mouthpiece for endoscopy according to (4), wherein the frame portion includes a locking portion that detachably locks the frame portion to the proximal end of the mouthpiece body.
(6) a cylindrical tooth receiving portion provided at a distal end portion of the mouthpiece body;
A covering portion covering the outer periphery of the tooth receiving portion,
The mouthpiece for endoscopy according to any one of (1) to (5), wherein the hardness of the covering portion is lower than the hardness of the tooth receiving portion.
(7) The mouthpiece for endoscopy according to (6), wherein the covering portion is detachable from the mouthpiece body.
(8) While the tooth receiving portion has a convex portion protruding radially outward at the distal end portion of the tooth receiving portion,
The covering portion has, on the inner peripheral surface side, a small diameter portion and a large diameter portion, and a step portion that is formed by a step of the small diameter portion and the large diameter portion and the diameter changes discontinuously
The mouthpiece for endoscopy according to (6) or (7), wherein the convex portion and the stepped portion are engaged.
(9) The covering portion according to any one of (6) to (8), wherein the covering portion has a second convex portion protruding outward in a radial direction at a distal end portion of the covering portion on the outer peripheral surface side. Mouthpiece for endoscopy.
(10) While the tooth receiving portion has a convex portion protruding outward in the radial direction at the distal end portion of the tooth receiving portion,
The covering portion has, on the outer peripheral surface side, a second convex portion protruding outward in the radial direction at the distal end portion of the covering portion,
In the above (6), the first positioning portion provided on the distal end surface of the convex portion and the second positioning portion provided on the distal end surface of the second convex portion and facing the first positioning portion. The mouthpiece for endoscopy as described.
(11) The covering portion has a cylindrical shape with an outer diameter having a major axis and a minor axis,
The second convex portion has a first extending portion extending at a first length on the major axis and a second extending portion extending at a second length on the minor axis. ,
Said 1st length is a mouthpiece for endoscopy as described in said (9) or (10) larger than said 2nd length.
(12) The mouthpiece for endoscopy according to (11), wherein the first length is twice or more the second length.
(13) The mouthpiece for endoscopy according to (11) or (12), wherein the first extending portion is formed thin toward the outer edge.
(14) The distal side surface of the first extending portion communicates with the insertion hole provided in the mouthpiece body, and is hollowed out leaving the outer periphery, any of (11) to (13) The mouthpiece for endoscopy according to claim 1.
(15) The mouthpiece for endoscopy according to any one of (11) to (14), wherein an outer edge of the proximal side surface of the first extension portion is chamfered.
(16) A cylindrical tooth receiving portion provided at a distal end portion of the mouthpiece body,
The mouthpiece for endoscopy according to any one of (1) to (9), wherein an outer diameter of the tooth receiving portion has a major axis and a minor axis.
(17) Any one of the above (6) to (14), wherein the inner peripheral surface of the covering portion is provided with a convex contact portion that is continuous in a circumferential direction in contact with the outer peripheral surface of the tooth receiving portion. The mouthpiece for endoscopy according to Item.
(18) The mouthpiece for endoscopy as described in (17) above, wherein the airtightness between the tooth receiving portion and the contact portion is 3 kPa or more.
(19) Between the distal end portion and the proximal end portion of the mouthpiece main body, there is a flange portion extending outward from the outer peripheral surface,
The mouthpiece for endoscopy according to (16), wherein the collar portion extends longer in the extending direction of the short axis than in the extending direction of the long axis of the tooth receiving portion.
(20) The mouthpiece for endoscopy according to (19), wherein the major axis direction of the buttocks and the extending direction of the first extending portion are orthogonal to each other.
(21) The mouthpiece for endoscopy according to (19) or (20), wherein the buttocks are curved in a convex shape from the distal end to the proximal end of the mouthpiece body.
(22) a cylindrical tooth receiving portion provided at a distal end portion of the mouthpiece body;
A covering portion covering the outer periphery of the tooth receiving portion;
Between the distal end portion and the proximal end portion of the mouthpiece body, has a flange extending outward from the outer peripheral surface,
Any one of the above (1) to (21), wherein the shortest distance from the base end portion of the back surface of the collar portion to the distal end of the mouthpiece body is substantially equal to the length of the covering portion in the longitudinal direction. The mouthpiece for endoscopy according to claim 1.
(23) having a covering portion covering the outer periphery of the tooth receiving portion;
The mouthpiece for endoscopy according to any one of (19) to (22), wherein a proximal end surface of the covering portion and a distal side surface of the flange portion have shapes corresponding to each other.
(24) The mouthpiece for endoscopy according to (23), wherein the distal side surface of the buttocks and the proximal end surface of the covering portion are fitted to each other and have a concavo-convex portion provided non-circularly.
(25) Any one of (1) to (24) above, wherein the insertion hole has a constricted shape having a reduced diameter portion and an enlarged diameter portion from the proximal end to the distal end of the mouthpiece body. The mouthpiece for endoscopy according to Item.
(26) The deaeration prevention valve device includes a flexible expansion / contraction portion that is provided around the insertion hole, and the expansion / contraction portion is provided at a substantially central portion of the expansion / contraction portion, and surrounds the endoscope. Having an endoscope insertion part to wear,
The telescopic part is concentric with the annular endoscope insertion part, and has an annular bellows part in which a peak part and a valley part are provided in a radial direction,
The bellows portion is arranged coaxially with an inner circle surrounded by a boundary portion that is a boundary between the reduced diameter portion and the enlarged diameter portion, and the outer edge diameter of the bellows portion is larger than the diameter of the inner circle. The mouthpiece for endoscopy according to any one of (1) to (25), which is large.
(27) The mouthpiece for endoscopy according to (26), wherein an inner edge diameter of the bellows portion is smaller than a diameter of the inner circle.
(28) The mouthpiece for endoscopy according to any one of (1) to (27), wherein an airtightness between the deaeration prevention valve device and the mouthpiece body is 3 kPa or more.
(29) Deaeration used for an endoscope mouthpiece that is detachably attached to a proximal end portion of a mouthpiece that is inserted into an oral cavity having a lumen through which an endoscope can be inserted and removed. A prevention valve device,
A frame portion attached to an outer peripheral surface of the base end portion of the mouthpiece;
A locking portion provided in the frame portion and releasably locked to the outer peripheral surface of the base end portion;
A valve body provided inside the frame part;
Have
The valve body is
An annular endoscope insertion portion that is provided at a substantially central portion of the valve body portion and is attached to the endoscope;
Flexible telescopic means provided around the endoscope insertion portion;
The deaeration prevention valve device characterized by having.
(30) The removal portion according to (29), wherein the engagement portion is detachably engaged with the outer peripheral surface of the base end portion by engagement means protruding toward the inside of the frame portion. Qi prevention valve device.
(31) Deaeration used for an endoscope mouthpiece that is detachably attached to a proximal end portion of a mouthpiece that is inserted into an oral cavity having a lumen through which an endoscope can be inserted and removed. A prevention valve device,
A frame portion attached to an inner peripheral surface of the base end portion of the mouthpiece;
A locking portion provided on the frame portion and releasably locked to the inner peripheral surface of the base end portion;
A valve body provided inside the frame part;
Have
The valve body is
An annular endoscope insertion portion that is provided at a substantially central portion of the valve body portion and is attached to the endoscope;
Flexible telescopic means provided around the endoscope insertion portion;
The deaeration prevention valve device characterized by having.
(32) The locking portion according to (31), wherein the locking portion is detachably locked to the inner peripheral surface of the base end portion by locking means protruding toward the outside of the frame portion. Deaeration prevention valve device.
(33) The deaeration prevention valve device according to any one of (29) to (32), wherein the locking portions are provided at two or more locations apart from each other around the frame portion.
(34) The locking portion is formed integrally with the locking means, and is in a closed state in which the locking means can be locked with respect to the base end portion or in an open state in which the locking means can be detached from the base end portion. The deaeration-preventing valve device according to (29) or (30), further including a finger-hanging portion that opens and closes.
(35) The endoscope insertion portion according to any one of (29) to (34), wherein the endoscope insertion portion includes a straight pipe portion extending in a thickness direction of the valve body portion. Anti-aeration valve device.
(36) The deaeration-preventing valve device according to any one of (29) to (35), further including a substantially ring-shaped fixing member that fixes the valve body portion to the frame portion.
(37) The deaeration prevention valve device according to any one of (29) to (36), wherein the expansion / contraction means includes a bellows portion.
(38) The degassing prevention according to (37), wherein the bellows part includes a flat inclined part and a folded part between adjacent inclined parts, and the folded part is thinner than the inclined part. Valve device.
(39) The removal according to any one of (29) to (38), wherein a reinforcing member is provided between an outer peripheral edge portion of the endoscope insertion portion and an inner peripheral edge portion of the expansion / contraction means. Qi prevention valve device.
(40) The deaeration prevention valve device according to (39), wherein the reinforcing member is formed in an O-ring shape.
(41) The deaeration prevention valve device according to any one of (29) to (40), wherein an inner diameter of the endoscope insertion portion is equal to or smaller than an outer diameter of the endoscope inserted through the endoscope insertion portion.

DESCRIPTION OF SYMBOLS 11 ... Mouthpiece main body 12 ... Insertion hole 14 ... Frame part 16 ... Telescopic part 17 ... Endoscope insertion part 18 ... Deaeration prevention valve apparatus 20 ... Knob part 21 ... Locking means 22 ... Engaging projection 23 ... Lower end 24 ... Locking part 25 ... Upper end 26 ...

Tooth receiving part

28, 29, 29A ... Covering part 30 ... convex part 32 ... large diameter part 34 ... small diameter part 35 ... covering part 36 ... major axis 37 ... stepped part 38 ... minor axis 40 ... outer peripheral surface 42 ··· flange 50 ··· second convex portions 51 and 52 ··· end surface 54 ··· engagement receiving portion 59 ··· fixing ring 60 · closure plug portion 61 ··· mouthpiece body 100 ··· ..Endoscopic mouthpiece 110... Diameter reduction part 111... 120 ... Bellows 120A ... Outer edge 120B ... Inner edge 200 ... Mouthpiece 210 ... Back 300 ... Endoscopic examination mouthpiece 310 ... Long axis 311 ... No. One length 312 ... first extension part 313 ... outer periphery 314 ... recess 315 ... outer edge 316 ... contact part 320 ... minor axis 321 ... second length 322 .... Second extension part 323 ... First positioning part 324 ... Second positioning part 351 ... Proximal end face 352 ... Distal side face 353 ... Concave and convex part 414 ... Frame part 418 ... Deaeration prevention valve device 420 ... Engagement receiving part 421 ... Tube part 422 ... Fitting convex part 423 ... Hole part 425 ... Fitting concave part 426 ... Fitting retention 501 ... Deaeration prevention valve device 502 ... Locking part 503 ... Frame part 504 ... Ma Spiece 505 ... Valve body part 506 ... Endoscope insertion part 507 ... Fixing ring 508 ... Telescopic means 509 ... Reinforcing member 513 ... Telescopic part 521 ... Locking means 522 ··· Fingering portion 523 ··· Joint portion 531 ··· Fixing portion 532 ··· Nail 541 · · · Diameter-enlarged portion 542 ··· Lumen 543 · · · Base end portion 544 · · · Body external portion 545鍔 part 546 ... oral cavity 547 ... first opening part 548 ... second opening part 549 ... cover 554 ... closing plug part 562 ... insertion hole 565 ... straight pipe part 582 ... turn-up part 583 ... inclined part 600 ... deaeration prevention valve device 620 ... locking part 630 ... base end part 631 ... groove part 632 ... hole part 633 ... Projection 640 ... mouthpiece 650 ... collar A ... shortest distance

Claims

A mouthpiece body having an insertion hole through which an endoscope can be inserted and removed freely;
A deaeration preventive valve device that hermetically seals between the endoscope and the mouthpiece body inserted through the insertion hole;
A mouthpiece for endoscopy having an endoscope.
The mouthpiece for endoscopy according to claim 1, wherein the deaeration prevention valve device is provided around the insertion hole and is worn around the endoscope inserted through the insertion hole.
The deaeration prevention valve device has a flexible expansion and contraction portion provided around the insertion hole,
The mouthpiece for endoscopy according to claim 1 or 2, wherein the expansion / contraction part has an endoscope insertion part that is provided at a substantially central part of the expansion / contraction part and is worn around the endoscope.
The mouthpiece for endoscopy according to any one of claims 1 to 3, wherein the deaeration prevention valve device has a frame portion that is detachably attached to the mouthpiece body.
The mouthpiece for endoscopy according to claim 4, wherein the frame portion includes a locking portion that detachably locks the frame portion to a proximal end of the mouthpiece body.
A cylindrical tooth receiving portion provided at the distal end of the mouthpiece body;
A covering portion covering the outer periphery of the tooth receiving portion,
The mouthpiece for endoscopy as described in any one of Claims 1-5 whose hardness of the said coating | coated part is lower than the hardness of the said tooth receiving part.
The mouthpiece for endoscopy according to claim 6, wherein the covering portion is detachable from the mouthpiece body.
The tooth receiving portion has a convex portion protruding outward in the radial direction at the distal end portion of the tooth receiving portion, and
The covering portion has, on the inner peripheral surface side, a small-diameter portion and a large-diameter portion, and a step portion that is formed by a step of the small-diameter portion and the large-diameter portion and whose diameter changes discontinuously,
The mouthpiece for endoscopy according to claim 6 or 7, wherein the convex portion and the stepped portion are engaged with each other.
The endoscopic examination according to any one of claims 6 to 8, wherein the covering portion has a second convex portion projecting radially outward at a distal end portion of the covering portion on the outer peripheral surface side. Mouthpiece.
The tooth receiving portion has a convex portion protruding outward in the radial direction at the distal end portion of the tooth receiving portion, and
The covering portion has, on the outer peripheral surface side, a second convex portion protruding outward in the radial direction at the distal end portion of the covering portion,
The first positioning portion provided on the distal end surface of the convex portion and the second positioning portion provided on the distal end surface of the second convex portion and facing the first positioning portion. Mouthpiece for endoscopy.
The covering portion has a cylindrical shape with an outer diameter having a major axis and a minor axis,
The second convex portion has a first extending portion extending at a first length on the major axis and a second extending portion extending at a second length on the minor axis. ,
The mouthpiece for endoscopy according to claim 9 or 10, wherein the first length is larger than the second length.
The mouthpiece for endoscopy according to claim 11, wherein the first length is at least twice as long as the second length.
The mouthpiece for endoscopy according to claim 11 or 12, wherein the first extending portion is formed thin toward the outer edge.
The mouthpiece for endoscopy according to any one of claims 11 to 13, wherein an outer edge of a proximal side surface of the first extension portion is chamfered.
It has a cylindrical tooth receiving portion provided at the distal end of the mouthpiece body,
The mouthpiece for endoscopy according to any one of claims 1 to 9, wherein an outer diameter of the tooth receiving portion has a major axis and a minor axis.
The internal view according to any one of claims 6 to 14, further comprising a convex contact portion that is continuous in a circumferential direction in contact with an outer peripheral surface of the tooth receiving portion on an inner peripheral surface of the covering portion. Speculum mouthpiece.
The mouthpiece for endoscopy according to claim 16, wherein airtightness between the tooth receiving part and the contact part is 3 kPa or more.
Between the distal end portion and the proximal end portion of the mouthpiece body, it has a flange extending outward from the outer peripheral surface,
The mouthpiece for endoscopy according to claim 15, wherein the collar portion extends longer in the extending direction of the short axis than in the extending direction of the long axis of the tooth receiving portion.
The mouthpiece for endoscopy according to claim 18, wherein the major axis direction of the buttocks and the extending direction of the first extending part are orthogonal to each other.
The mouthpiece for endoscopy according to claim 18 or 19, wherein the buttocks are curved in a convex shape from the distal end to the proximal end of the mouthpiece body.
A cylindrical tooth receiving portion provided at the distal end of the mouthpiece body;
A covering portion covering the outer periphery of the tooth receiving portion;
Between the distal end portion and the proximal end portion of the mouthpiece body, has a flange extending outward from the outer peripheral surface,
The length of the covering portion along the direction connecting the distal end and the proximal end of the mouthpiece body, and the shortest distance from the base end portion of the back surface of the flange to the distal end of the mouthpiece body The mouthpiece for endoscopy as described in any one of Claims 1-20 which are equivalent.
Having a covering portion covering the outer periphery of the tooth receiving portion;
The mouthpiece for endoscopy according to any one of claims 18 to 21, wherein a proximal end surface of the covering portion and a distal side surface of the flange portion have shapes corresponding to each other.
The mouthpiece for endoscopy according to claim 22, wherein the distal side surface of the buttocks and the proximal end surface of the covering portion are fitted to each other and have an uneven portion provided non-circularly.
The internal view according to any one of claims 1 to 23, wherein the insertion hole has a constricted shape having a reduced diameter portion and an enlarged diameter portion from a proximal end to a distal end of the mouthpiece body. Speculum mouthpiece.
The deaeration prevention valve device includes a flexible expansion / contraction portion that is provided around the insertion hole, and the expansion / contraction portion is provided in a substantially central portion of the expansion / contraction portion and is attached to the endoscope. Having an endoscope insertion part,
The telescopic part is concentric with the annular endoscope insertion part, and has an annular bellows part in which a peak part and a valley part are provided in a radial direction,
The bellows portion is arranged coaxially with an inner circle surrounded by a boundary portion that is a boundary between the reduced diameter portion and the enlarged diameter portion, and the outer edge diameter of the bellows portion is larger than the diameter of the inner circle. The mouthpiece for endoscopy according to any one of claims 1 to 24, which is large.
The mouthpiece for endoscopy according to claim 25, wherein a diameter of an inner edge of the bellows portion is smaller than a diameter of the inner circle.
The mouthpiece for endoscopy according to any one of claims 1 to 26, wherein an airtightness between the deaeration prevention valve device and the mouthpiece body is 3 kPa or more.
A deaeration prevention valve device used for an endoscope mouthpiece, which is detachably attached to a proximal end portion of a mouthpiece inserted into an oral cavity having a lumen through which an endoscope can be inserted and removed. Because
A frame portion attached to an outer peripheral surface or an inner peripheral surface of the base end portion of the mouthpiece;
A locking portion provided on the frame portion and detachably locked to the outer peripheral surface or inner peripheral surface of the base end portion;
A valve body provided inside the frame part;
Have
The valve body is
An annular endoscope insertion portion that is provided at a substantially central portion of the valve body portion and is attached to the endoscope;
Flexible telescopic means provided around the endoscope insertion portion;
The deaeration prevention valve device characterized by having.
29. The locking portion according to claim 28, wherein the locking portion is detachably locked to the outer peripheral surface or the inner peripheral surface of the base end portion by a locking means protruding toward the inner side or the outer side of the frame portion. The deaeration prevention valve device as described.
30. The deaeration prevention valve device according to claim 28 or 29, wherein the locking portions are provided at two or more locations apart from each other around the frame portion.
The locking portion is locked to the outer peripheral surface of the base end portion,
The locking portion is formed integrally with the locking means, and is opened and closed in a closed state in which the locking means can be locked with respect to the base end portion or in an open state in which the locking means can be detached from the base end portion. The deaeration prevention valve device according to any one of claims 28 to 30, further comprising a finger hooking portion.
The deaeration prevention valve device according to any one of claims 28 to 31, wherein the endoscope insertion portion has a straight pipe portion extending in a thickness direction of the valve body portion. .
The deaeration prevention valve device according to any one of claims 28 to 32, further comprising a substantially ring-shaped fixing member that fixes the valve body portion to the frame portion.
The deaeration prevention valve device according to any one of claims 28 to 33, wherein the expansion / contraction means includes a bellows portion.
35. The deaeration prevention valve device according to claim 34, wherein the bellows part includes a flat inclined part and a folded part between adjacent inclined parts, and the folded part is thinner than the inclined part.
36. The deaeration prevention valve device according to any one of claims 28 to 35, further comprising a reinforcing member between an outer peripheral edge portion of the endoscope insertion portion and an inner peripheral edge portion of the expansion / contraction means.
The deaeration prevention valve device according to claim 36, wherein the reinforcing member is formed in an O-ring shape.
38. The deaeration prevention valve device according to any one of claims 28 to 37, wherein an inner diameter of the endoscope insertion portion is equal to or smaller than an outer diameter of the endoscope inserted through the endoscope insertion portion.