Guiding tool for nasal endoscope

Abstract

To provide an insertion guiding tool for a nasal endoscope, which enables the nasal endoscope to be easily inserted into an intranasal route.SOLUTION: An insertion guiding tool for a nasal endoscope comprises a flexible cannula (1), and a flexible tube or a cylindrical body (11). The flexible tube or the cylindrical body (11) guides an insertion tube of the nasal endoscope.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a guiding device for a transnasal endoscope that guides the insertion of a transnasal endoscope, a guiding device kit for a transnasal endoscope, and a guiding system for a transnasal endoscope.

Background Art

[0002] In recent years, a transnasal endoscope that is thinner than the diameter of the insertion tube of an oral endoscope has been developed and proposed (Patent Document 1). Since the transnasal endoscope inserts the insertion tube from the external nostril instead of from the oral cavity, compared with the oral endoscope, it is less likely to cause vomiting due to the pharyngeal reflex and causes less pain to the animal subject, so it has spread rapidly.

[0003] Conventionally, in order to avoid damage caused by direct contact between the insertion tube of the transnasal endoscope and the nasal mucosa in advance and to easily insert the insertion tube of the transnasal endoscope, an insertion assist device provided with an inner tube for inserting and introducing the insertion tube of the transnasal endoscope has been proposed (Patent Document 2).

[0004] By the way, as a path through which the insertion tube of the transnasal endoscope can be inserted, there are two paths in the nasal cavity of an animal: a path through the middle nasal meatus and a path through the inferior nasal meatus. After selecting one of these two paths, pretreatment is performed (administration of a vasoconstrictor, a sedative, an analgesic, an anesthetic, etc.), and the transnasal endoscope is inserted into the pretreated path.

[0005] However, since the pretreated path is inside the living body, the operation of the transnasal endoscope cannot be visually recognized and confirmed from the outside. Therefore, accurately and quickly inserting the transnasal endoscope into the pretreated path depends on the experience and skill of the operator. Therefore, for an operator with little experience and poor skill, the operation takes time, and there has been a case where the transnasal endoscope is inserted into a path that has not been pretreated by misselecting the path.

[0006] Particularly, for an operator who is not used to the operation of a transnasal endoscope and has little experience, the operator may be confused during the operation and make a mistake in route selection. As a result, it takes time for insertion, the operation becomes messy, and the nasal cavity, near the esophageal inlet, or near the tracheal inlet may be damaged, imposing a physical burden (pain and injury) and a mental burden (a sense of oppression, uneasiness, disgust, etc.) on the animal to be treated. In addition, since the insertion assisting device of the above prior art (Patent Document 2) has an insertion tube of the transnasal endoscope enclosed therein, the inner diameter and outer diameter of the insertion assisting device are also large, and the attachment of the insertion assisting device rather imposes a greater physical and mental burden on the animal to be treated.

[0007] Therefore, there is still a demand for the improvement of the transnasal endoscope and the research and development of a guiding device for the transnasal endoscope, and there is an urgent need to construct a guiding device (kit) and a guiding system that guide the insertion tube of the transnasal endoscope to be inserted into an accurate selected route after pretreatment.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0009] The present invention provides an insertion guiding device (kit) and a guiding system for a transnasal endoscope, which ensure the correct selection and insertion of the nasal cavity route into which the insertion tube of the transnasal endoscope is inserted, significantly prevent route selection errors during the insertion of the transnasal endoscope, reduce the physical burden on the animal to be treated and significantly suppress the mental burden; and can significantly guide and easily insert the transnasal endoscope into the pretreated nasal cavity route appropriately regardless of the experience and skill level of the operator.

Means for Solving the Problems

[0010] 〔One aspect of the present invention〕 The present invention proposes the following invention as one of its aspects. 〔1〕An introducer for a transnasal endoscope, comprising: a flexible cannula and a flexible tube or cylinder; wherein the flexible cannula has a length from the external nostril to any one of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; the insertion-side tip of the flexible cannula has a cylindrical shape and is provided with an insertion hole obliquely cut with respect to the side surface near the apex of the cylindrical shape; the external-nostril-side end of the flexible cannula is provided with an insertion site; the flexible cannula is inserted from the external nostril and inserted to any one of the positions of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; the flexible tube or cylinder is inserted from the insertion site of the flexible cannula, inserted through the insertion hole, and inserted to any one of the positions of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; after the flexible tube or cylinder is inserted, the flexible cannula is removed from the external nostril; the flexible tube or cylinder is an introducer for a transnasal endoscope that guides the insertion tube of the transnasal endoscope. 〔2〕An introducer for a transnasal endoscope, comprising: a flexible cannula and a flexible tube or cylinder; wherein the flexible cannula has a length from the external nostril to any one of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; the insertion-side tip of the flexible cannula has a cylindrical shape and is provided with an insertion hole obliquely cut with respect to the side surface near the apex of the cylindrical shape; the external-nostril-side end of the flexible cannula is provided with an insertion site; The flexible tube or cylinder is inserted from the external nostril and inserted to any one of the positions of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet. The flexible cannula is guided to the inserted flexible tube or cylinder and inserted to any one of the positions of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet. The inserted flexible cannula is removed from the external nostril. The flexible tube or cylinder is a guiding device for a transnasal endoscope that guides the insertion tube of the transnasal endoscope. 〔3〕 The flexible cannula is removed from the external nostril and remains held by the flexible tube or cylinder. The guiding device for a transnasal endoscope according to 〔1〕 or 〔2〕. 〔4〕 A guiding device kit for a transnasal endoscope, comprising a flexible cannula and a flexible tube or cylinder, The flexible cannula, has a length from the external nostril to any one of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet. The insertion-side tip of the flexible cannula has a cylindrical shape and is provided with an insertion hole that is obliquely cut with respect to the side surface near the apex of the cylindrical shape. The external nostril-side end of the flexible cannula is provided with an insertion site. The flexible cannula is inserted from the external nostril and inserted to any one of the positions of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet. The flexible tube or cylinder is inserted from the insertion site of the flexible cannula, inserted through the insertion hole, and inserted to any one of the positions of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet. After inserting the flexible tube or cylinder, the flexible cannula is removed from the external nostril. The flexible tube or cylinder is a guiding device kit for a transnasal endoscope that guides the insertion tube of the transnasal endoscope. 〔5〕 A nasal endoscope guiding tool kit, comprising: a flexible cannula and a flexible tube or cylinder; The flexible cannula: has a length from the external nostril to any one of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; the insertion-side tip of the flexible cannula has a cylindrical shape and is provided with an insertion hole obliquely cut from near the apex of the cylindrical shape to the side surface; the nostril-side end of the flexible cannula is provided with an insertion site; The flexible tube or cylinder is inserted from the external nostril and inserted to any one of the positions of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; The flexible cannula is guided by the inserted flexible tube or cylinder and inserted to any one of the positions of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; the inserted flexible cannula is removed from the external nostril; The flexible tube or cylinder guides the insertion tube of the nasal endoscope. A nasal endoscope guiding tool kit. 〔6〕 The nasal endoscope guiding tool kit according to 〔4〕 or 〔5〕, wherein the flexible cannula is removed from the external nostril and remains held by the flexible tube or cylinder. 〔7〕 A nasal endoscope guiding system, comprising: providing a flexible cannula and a flexible tube or cylinder; The flexible cannula: has a length from the external nostril to any one of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; the insertion-side tip of the flexible cannula has a cylindrical shape and is provided with an insertion hole obliquely cut from near the apex of the cylindrical shape to the side surface; the external-nostril-side end of the flexible cannula is provided with an insertion site; Insert the flexible cannula from the external nostril to any of the positions of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet; Insert the flexible tube or cylinder from the insertion site of the flexible cannula and insert it through the insertion hole to any of the positions of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet; After inserting the flexible tube or cylinder, remove the flexible cannula from the external nostril; The flexible tube or cylinder guides the insertion tube of the transnasal endoscope; A transnasal endoscope guiding system comprising this. 〔8〕 A guiding device system for a transnasal endoscope, comprising: Prepare a flexible cannula and a flexible tube or cylinder; The flexible cannula is It has a length from the external nostril to any part of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet, The insertion-side tip of the flexible cannula has a cylindrical shape and is provided with an insertion hole that is obliquely cut from near the apex of the cylindrical shape to the side surface, The external nostril-side end of the flexible cannula is provided with an insertion site, Insert the flexible tube or cylinder from the external nostril to any of the positions of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet; The flexible cannula is guided by the inserted flexible tube or cylinder and inserted to any of the positions of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet; Remove the inserted flexible cannula from the external nostril; The flexible tube or cylinder guides the insertion tube of the transnasal endoscope; A transnasal endoscope guiding system comprising this. 〔9〕 Further comprising removing the flexible cannula from the external nostril and leaving it held by the flexible tube or cylinder; The transnasal endoscope guiding system according to 〔7〕 or 〔8〕.

Advantages of the Invention

[0011] According to the present invention, after a flexible cannula is inserted into the nasal cavity in advance, by inserting a flexible tube or cylinder; or by inserting a flexible tube or cylinder in advance; a flexible tube or cylinder is used to significantly guide the insertion tube of the transnasal endoscope, ensuring the correct selection and insertion of the nasal cavity path. In addition, pretreatment (such as administration of vasoconstrictors, sedatives, analgesics, or anesthetics) can be performed using a flexible cannula or a flexible tube or cylinder.

[0012] Then, by removing the flexible cannula from the nasal cavity and leaving the flexible tube or cylinder in the selected nasal cavity path, it is possible to significantly prevent errors in selecting the nasal cavity path during the insertion of the transnasal endoscope after pretreatment, and the insertion tube does not directly slide against the inner wall of the nasal cavity, significantly avoiding damage to the inner wall of the nasal cavity.

[0013] Furthermore, since the insertion tube of the transnasal endoscope can be inserted along the flexible tube or cylinder left in the selected nasal cavity path, regardless of the experience and skill level of the operator (veterinarian, doctor, etc.), the insertion tube of the transnasal endoscope can be accurately and easily guided and inserted into the pretreated selected nasal cavity path. As a result, it is possible to reduce the mental burden on the operator and shorten the insertion time of the transnasal endoscope, and at the same time, achieve a high level of reduction of the physical burden (pain and injury) and suppression of the mental burden (sense of oppression, disgust, uneasiness, etc.) on the animal to be treated.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

[0015] 〔Definition〕 The "nasal endoscope guiding device" is a device that guides (attracts, marks, assists) the nasal endoscope (its insertion tube) to pass through a predetermined nasal cavity selection route site from the external nostril to a desired site, such as the middle pharynx, lower pharynx, esophageal inlet, or tracheal inlet, smoothly, accurately, and quickly. Therefore, without being restricted by the name of the "guiding device", as long as it undertakes such functions and roles, it belongs to the category of the "nasal endoscope guiding device" according to the present invention. The "cannula" generally means "small reed" in Latin and is a tube (hollow cylinder) that can be inserted into the body for injecting or sucking liquid or gas. In the present invention, although it is not construed as being limited to a specific object, the "cannula" generally means a relatively large tube having a specific diameter for comfortable insertion from the external nostril, being hollow, and having excellent flexibility and softness. The "tube" generally refers to a hollow cylinder or pipe. The "cylinder" means a rod-shaped body without a hollow in the "tube", and it has no hollow (pipe) in the "tube". In the present invention, the "tube" has a tube diameter (outer diameter) that can pass through the hollow interior of the "cannula", and the "cylinder" has a cylinder diameter that can pass through the hollow interior of the "cannula". The "nasal endoscope" basically comprises an operation body, a processing device, an insertion tube having a sensor tube, a processing tube, a suction tube, and a discharge tube, and a camera and a sensor connected to the tip of the insertion tube. When in use, it is inserted through the external nostril and into the nasal cavity, esophagus, bronchus, stomach, duodenum, small intestine, etc. "Animals" include fish, amphibians, reptiles, birds, and mammals, and particularly mammals [especially primates (humans)].

[0016] [Guide tool 1 for nasal endoscope] The guide tool 1 for nasal endoscope according to the present invention comprises a flexible cannula (1) and a flexible tube or cylinder (10) (Figs. 1 and 2).

[0017] (Flexible cannula) The flexible cannula (1) is mainly used for inserting a flexible tube or cylinder (10) through its hollow. Also, the flexible cannula (1) can be used as an instrument for pretreatment.

[0018] (Length) The flexible cannula (1) is inserted through the external nostril (31) and into the middle nasal meatus position, inferior nasal meatus position, esophageal inlet, or tracheal inlet. Therefore, the flexible cannula (1) has at least the length from the external nostril (31) to any one of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet.

[0019] Although it depends on the animal to be treated, in the case of primates (especially humans), the length of the flexible cannula (1) is about 5 cm or more and 30 cm or less, preferably with a lower limit value of 10 cm or more and an upper limit value of 25 cm or less, and more preferably with a lower limit value of 15 cm or more and an upper limit value of 20 cm or less.

[0020] When the length of the flexible cannula (1) is within the above numerical range, it becomes possible to sufficiently insert and leave the flexible tube or cylinder (10) at any position of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet from the external nostril (31).

[0021] (Through hole) 1 and 2, the insertion tip of the flexible cannula (1) is cylindrical and has an insertion hole (3) cut obliquely from the apex of the cylinder to the side. Since the insertion hole (3) retains the cylindrical shape of the tip, when the flexible cannula (1) is inserted from the external nostril (31), it is possible to significantly prevent damage to the inside of the nasal cavity. In addition, the flexible tube or cylindrical body (10) can be easily moved in and out (inserted or removed) from the hollow of the flexible cannula via the insertion hole (3). As a result, the presence of the insertion hole (3) makes it possible to easily insert the flexible tube or cylindrical body (10), making it easier to operate and handle.

[0022] The size of the insertion hole (3), in terms of length x width, is approximately 0.1 cm to 0.7 cm, preferably approximately 0.4 cm to 0.5 cm, and more preferably approximately 0.7 cm to 0.3 cm. By having the size of the insertion hole (3) within the above numerical range, the flexible tube or cylinder (10) can be easily inserted and removed from the hollow interior of the flexible cannula (1). As a result, the presence of the insertion hole (3) makes it possible to easily insert the flexible tube or cylinder (10), making it easier to operate and handle.

[0023] (insertion site) As shown in FIGS. 1 and 2, the external nostril side end of the flexible cannula (1) is provided with an insertion site (7). The insertion site (7) is located near the external nostril (31) and serves as an entrance for inserting the flexible tube or cylinder (10). Further, the insertion site (7) also has a function as a stopper in the flexible cannula (1), and exhibits a function of preventing the flexible cannula (1) from entering the nasal cavity more than necessary. And the insertion site (7) may function as a connection site where the flexible tube or cylinder (10) is inserted and connected.

[0024] Since the insertion site (7) serves not only as an insertion entrance but also as a stopper and a connection site, compared with the flexible cannula (1), its flexibility may be lower and its hardness may be firmer. Also, the inner tube of the insertion site (7) has a hollow structure and is of the same shape as the flexible cannula (1), and the outer tube of the insertion site (7) may have an outer diameter equal to or larger than that of the flexible cannula (1). Preferably, as shown in FIGS. 1 and 2, at the connection between the insertion site (7) and the flexible cannula (1), it is preferable that the inner diameters are the same.

[0025] The insertion site (7) may be formed directly on the flexible cannula (1). Considering ensuring rigidity, ease of handling, etc., as shown in FIGS. 1 and 2, the end of the insertion site (7) may be configured to cover the external nostril side end of the flexible cannula (1), and the other end of the insertion site (7) may have a frustum - shaped open shape (trumpet shape) facing outward. Thereby, it becomes easier to insert the flexible tube or cylinder (10), and it is also possible to connect the insertion site (7) to the attachment site (17) formed on the flexible tube or cylinder (10).

[0026] 〈Opening〉 As a preferred embodiment of the present invention, as shown in FIGS. 1 and 2, the flexible cannula (1) can be provided with one or more apertures (5) on its side surface. Preferably, one or more apertures (5) are preferably provided from half of the flexible cannula (1) toward the tip direction (insertion direction). By providing one or more apertures (5), pretreatment (such as administration of a vasoconstrictor, sedative, analgesic, or anesthetic) can be ensured. The shape of the aperture (5) is not limited, but preferably may be a polygonal shape, circular shape, or semi-circular shape.

[0027] The size of the aperture (5), as the vertical length × horizontal length, is about 0.05 cm or more × 0.7 cm or less, preferably about 0.3 cm or more × 0.5 cm or less, and more preferably about 0.5 cm or more × 0.4 cm or less. By the size of the aperture (5) being within the above numerical range, pretreatment can be reliably performed.

[0028] 〈Outer diameter · Inner diameter〉 Depending on the animal subject to the procedure, in the case of primates (especially humans), the outer diameter (diameter) of the flexible cannula (1) is about 0.5 cm or more and 1.5 cm or less, preferably the lower limit value is 0.75 cm or more and the upper limit value is about 1.2 cm or less, and more preferably the lower limit value is 1 cm or more and the upper limit value is about 1.05 cm or less. Also, the inner diameter (diameter) of the flexible cannula (1) is about 0.3 cm or more and 1.2 cm or less, more preferably the lower limit value is 0.55 cm or more and the upper limit value is about 1.1 cm or less, and more preferably the lower limit value is 0.8 cm or more and the upper limit value is about 1.0 cm or less.

[0029] When the outer diameter and inner diameter of the flexible cannula (1) are within the above numerical ranges, the insertion of the flexible cannula (1) becomes easy, and it becomes possible to easily insert and pass the flexible tube or cylinder (10) into the flexible cannula (1).

[0030] 〈Coefficient of friction〉 The coefficient of friction (coefficient of friction μ = F / P: the frictional force F acting between two surfaces and the perpendicular force P acting at that time) on the inner peripheral surface and the outer peripheral surface of the flexible cannula (1) is about 0.5 or less, preferably about 0.3 or less.

[0031] When the coefficient of friction is within the above numerical range, even if the outer peripheral surface of the flexible cannula (1) is in direct sliding contact with the inner wall of the nasal cavity, damage to the inner wall of the nasal cavity can be significantly suppressed. Since the flexible tube or cylinder (10) is inserted and passed through the inner peripheral surface of the flexible cannula (1) for use, its ease of insertion (smoothness) can be demonstrated, and for the animal subject, the physical burden (pain and injury, etc.) and mental burden (sense of pressure, disgust, and uneasiness) during insertion and attachment can be significantly reduced.

[0032] 〈Ra: Arithmetic mean roughness〉 When the inner peripheral surface and the outer peripheral surface of the flexible cannula (1) are subjected to uneven processing (microscopic uneven processing), the Ra (arithmetic mean roughness: JIS B0601 - 2001), which is an index of the uneven surface roughness, is about 6.3 or more and 25 or less, preferably the lower limit value is 9 or more and the upper limit value is about 20 or less. When the Ra value of the uneven surface applied to the inner peripheral surface and the outer peripheral surface of the flexible cannula (1) is within the above range, vasoconstrictors, sedatives, analgesics, anesthetics, etc. can be retained without leakage, and the pretreatment becomes easy.

[0033] 〈Hardness〉 The hardness of the flexible cannula (1) is about 30 degrees or more and 80 degrees or less in Shore A (JIS K 6253 - 3:2012: Durometer type A), preferably the lower limit value is 40 degrees or more and the upper limit value is about 70 degrees or less.

[0034] By having the lower limit value of the hardness be equal to or greater than the above numerical value, the rigidity when the flexible cannula (1) is inserted can be ensured, making the insertion itself easier. On the other hand, by having the upper limit value of the hardness be equal to or less than the above numerical value, the flexibility of the flexible cannula (1) can be exerted, making handling and operation easier. Also, since the hardness of the flexible cannula (1) is within the above numerical range, it is possible to significantly reduce the physical burden (pain, injury, etc.) and mental burden (sense of pressure, aversion, and uneasiness) during insertion and attachment.

[0035] 〈Elongation rate〉 The elongation rate (JIS L 1096: Method A) of the flexible cannula (1) is about 100% or more and 500% or less, preferably, the lower limit value is 120% or more and the upper limit value is about 450% or less.

[0036] Since the elongation rate of the flexible cannula (1) is within the above numerical range, it can have a certain degree of elongation in the external nostril (31) or within the nasal cavity, making it easy to insert, and making handling and operation easier. Also, it is possible to reduce the physical burden (pain, injury, etc.) and significantly suppress the mental burden (sense of pressure, aversion, and uneasiness) during insertion and attachment.

[0037] 〈Material〉 Since the cannula (1) has flexibility, it is easy to operate and insert. The cannula (1) may be formed from any material as long as it has flexibility. For example, as materials for the cannula, there may be mentioned silicone resin, silicone rubber, silicone blade, styrene-based elastomer, polyurethane (Milactran, Perecene, Tecoflex, Tecosen), polyester, polystyrene, polyolefin, (soft) polyvinyl chloride and other elastomers, nylon, etc. The flexible cannula (1) may be formed of a relatively large tube excellent in flexibility and softness.

[0038] 〈Pretreatment〉 According to a preferred embodiment of the present invention, pretreatment can be performed. For example, pretreatment can be performed before and after the insertion of the flexible cannula (1). The pretreatment is to administer a vasoconstrictor (for example, naphazoline nitrate, tramazoline hydrochloride, tetrahydrozoline hydrochloride - prednisolone) from the external nostril (31), and also to administer a sedative, analgesic or anesthetic (midazolam, diazepam, propofol, dexmedetomidine, xylocaine, etc.) from the external nostril (31).

[0039] As a preferred embodiment of the pretreatment, after performing the pretreatment of pre - administering a vasoconstrictor, an analgesic, etc. on the outer peripheral surface and the hollow inner peripheral surface of the flexible cannula (1), the flexible cannula (1) is inserted from the external nostril (31). Also, as another embodiment, a syringe (20) can be connected to the insertion site (7) of the flexible cannula (1) to perform the pretreatment.

[0040] By performing the pretreatment, it is possible to preferably prevent nasal bleeding and reduce nasal cavity damage, widen the external nostril (31), improve the passage in the nasal cavity, and facilitate the insertion of the flexible cannula (1) and the subsequent insertion of the flexible tube or cylinder (10). As a result, it is possible to reduce the mental burden on the operator and shorten the transnasal endoscope insertion time, and also to achieve high - level reduction of the physical burden (pain and injury) and suppression of the mental burden (sense of pressure, uneasiness, etc.) on the animal subject.

[0041] (Flexible tube or cylinder) In the present invention, the 'flexible tube or cylinder (10)' is inserted from the insertion site (7) of the flexible cannula (1), inserted through the insertion hole (3), and inserted to any position of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet, and remains to guide the insertion of the insertion tube (41) of the transnasal endoscope. The flexible tube or cylinder (10) may be used as an instrument for pretreatment.

[0042] 〈Mounting site〉 According to a preferred embodiment of the present invention, as shown in FIGS. 1 and 2, the outer nostril side end of the flexible tube or cylinder (10) may be provided with an attachment site (17). The attachment site (17) is located near the outer nostril (31). Further, the attachment site (17) also functions as a stopper in the flexible tube or cylinder (1), and exhibits a function of preventing the flexible tube or cylinder (1) from entering the nasal cavity more than necessary. And the attachment site (17) of the flexible tube may function as a connection site into which the syringe (20) is inserted and connected.

[0043] Since the attachment site (17) serves not only for attachment but also as a stopper and a connection site, it may have lower flexibility and higher hardness compared to the flexible tube or cylinder (10). Also, the attachment site (17) may have the same shape as the flexible tube or cylinder (10). The inner tube of the attachment site (17) in the flexible tube (10) has a hollow structure, has the same shape as the flexible tube (10), and the outer tube of the attachment site (17) may have the same or a larger outer diameter than the flexible tube (10). Preferably, as shown in FIGS. 1 and 2, at the connection between the attachment site (17) and the flexible tube (10), it is preferable that the inner diameter is the same.

[0044] The attachment site (17) may be directly formed on the flexible tube or cylinder (1). Considering ensuring rigidity, ease of handling, etc., as shown in FIGS. 1 and 2, the end of the insertion site (17) may be configured to cover the outer nostril side end of the flexible tube or cylinder (10), and the other end of the attachment site (17) may have a frustum - shaped open shape (trumpet shape) facing outward. Thereby, it becomes easier to insert the flexible tube or cylinder (10), and it is also possible to connect the attachment site (17) in the flexible tube (10) to the syringe (20).

[0045] The attachment site (17) of the flexible tube is, as described above, for example, of the configuration shown in Fig. 1(A). In the present invention, as shown in Fig. 1(B), a bilobed or propeller-shaped (preferably a two-blade uniaxial propeller shape) is preferred. The bilobed or propeller shape not only exhibits the function as the attachment site (17) but also facilitates handling, especially the pretreatment.

[0046] 〈Length〉 The flexible tube or cylinder (10) is inserted from the insertion site (7) of the flexible cannula (1), passed through the insertion hole (3), and inserted to any position of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet. Therefore, the flexible tube or cylinder (10) has at least the length from the external naris (31) to any part of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet. The flexible tube or cylinder (10) preferably has an additional length from the viewpoint of ease of handling and operation.

[0047] Depending on the target animal, in the case of primates (especially humans), the length of the flexible tube or cylinder (10) is 5 cm or more and 30 cm or less, preferably the lower limit is 10 cm or more and the upper limit is 25 cm or less, and more preferably the lower limit is 15 cm or more and the upper limit is about 20 cm or less. In a preferred embodiment of the present invention, the length of the flexible tube or cylinder (10) is preferably provided with an additional length of 30 cm or more and about 2 m, preferably the lower limit is 50 cm or more and the upper limit is about 1.5 m or less, in addition to the above-mentioned predetermined length.

[0048] When the length of the flexible tube or cylinder (10) is within the above numerical range, it is possible to sufficiently insert and leave the flexible tube or cylinder (10) at any position of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet from the external naris (31).

[0049] 〈Outer diameter · Inner diameter〉 Although it depends on the target animal, in the case of primates (including humans), the outer diameter (diameter) of the flexible tube (10) is 0.2 cm or more and 1.1 cm or less. More preferably, the lower limit is 0.5 cm or more and the upper limit is about 1.0 cm or less. More preferably, the lower limit is 0.7 cm or more and the upper limit is about 0.9 cm or less. Also, the inner diameter (diameter) of the flexible tube (10) is 0.1 cm or more and 1.0 cm or less. More preferably, the lower limit is 0.4 cm or more and the upper limit is about 0.9 cm or less. More preferably, the lower limit is 0.6 cm or more and the upper limit is about 0.8 cm or less. Also, the diameter of the flexible cylindrical body (10) may be the same as the outer diameter (diameter) of the flexible tube (10).

[0050] When the outer diameter and inner diameter of the flexible tube (10) or the diameter of the flexible cylindrical body (10) are within the above numerical ranges, the inside of the hollow of the flexible cannula can be easily inserted, easily inserted through the insertion hole, and easily inserted into the desired site. Moreover, its operability and handling become easier, and it is possible to reduce the physical burden (pain, injury, etc.) and significantly suppress the mental burden (sense of oppression, aversion, and uneasiness) during insertion and attachment.

[0051] 〈Coefficient of friction〉 The coefficient of friction (μ = F / P: the frictional force F acting between two surfaces divided by the vertical force P acting at that time) of the inner peripheral surface and outer peripheral surface of the flexible tube (10) or the outer peripheral surface of the flexible cylindrical body (10) is 0.5 or less, preferably about 0.3 or less.

[0052] When the coefficient of friction is within the above numerical range, the flexible tube or cylinder (10) can be easily inserted into the hollow of the flexible cannula (1), easily inserted through the insertion hole (3), and easily inserted into the desired site, and its operability and handling become easier. Also, although the flexible tube or cylinder (10) will come into direct sliding contact with the inner wall of the nasal cavity after being inserted through the flexible cannula (1), it can significantly suppress damage to the inner wall of the nasal cavity, exhibit its ease of insertion (slip), and reduce the physical burden (pain, injury, etc.) during insertion and wearing and significantly suppress the mental burden (sense of pressure, aversion, and uneasiness).

[0053] 〈Ra: Arithmetic mean roughness〉 When uneven processing (fine uneven processing) is performed on the surface of the inner peripheral surface and outer peripheral surface of the flexible tube (10) or the outer peripheral surface of the flexible cylinder (10), the index Ra (arithmetic mean roughness: JIS B0601 - 2001) as the uneven surface roughness is about 6.3 or more and 25 or less, preferably the lower limit value is 9 or more and the upper limit value is about 20 or less. When the Ra value of the uneven surface applied to the inner peripheral surface and outer peripheral surface of the flexible tube (10) or the outer peripheral surface of the flexible cylinder (10) is within the above range, a shrinking agent, sedative, analgesic, anesthetic, etc. can be retained without leakage, and the pretreatment becomes easy.

[0054] 〈Hardness〉 The hardness of the flexible tube or cylinder (10) is about 20 degrees or more and 70 degrees or less in Shore A (JIS K 6253 - 3:2012: Durometer type A), preferably the lower limit value is 30 degrees or more and the upper limit value is about 60 degrees or less.

[0055] By having the lower limit value of the hardness be the above numerical value or more, the rigidity when the flexible tube or cylinder (10) is inserted into the nasal cavity can be ensured, and the insertion itself can be facilitated. On the other hand, by having the upper limit value of the hardness be the above numerical value or less, the flexibility of the flexible tube or cylinder (10) can be exhibited, and the handling property and operability can be facilitated. Also, by having the hardness of the flexible tube or cylinder (10) be within the above numerical range, it is possible to reduce the physical burden (pain, injury, etc.) during insertion and attachment and significantly suppress the mental burden (sense of oppression, aversion, and uneasiness).

[0056] 〈Elongation rate〉 The elongation rate (JIS L 1096: Method A) of the flexible tube or cylinder (1) is about 100% or more and 500% or less, preferably, the lower limit value is 120% or more and the upper limit value is about 450% or less.

[0057] By having the elongation rate of the flexible tube or cylinder (10) be within the above numerical range, it can have a certain degree of elongation in the external nostril (31) or in the nasal cavity, and thus can be easily inserted, its handling property and operability become easy, and it is possible to reduce the physical burden (pain, injury, etc.) during insertion and attachment and significantly suppress the mental burden (sense of oppression, aversion, and uneasiness).

[0058] 〈Material〉 Since the tube or cylinder (10) has flexibility, it has easy operability and insertability. The tube or cylinder (10) may be formed from any material as long as it has flexibility. For example, as the material of the tube or cylinder (10), there may be mentioned silicone resin, silicone rubber, silicone blade, styrene-based elastomer, polyurethane (Milactran, Peresene, Tecoflex, Tecosen), polyester, polystyrene, polyolefin, (soft) polyvinyl chloride and other elastomers, nylon, etc.

[0059] (Removal of the flexible cannula) In the present invention, after inserting a flexible tube or cylinder (10), the flexible cannula (1) is removed from the external nostril (31). By removing the flexible cannula (1), it is possible to facilitate the guidance of the flexible tube or cylinder (10) through the insertion tube (41) of the transnasal endoscope.

[0060] In a preferred embodiment, the flexible cannula may be removed from the external nostril (31) and remain held by the flexible tube or cylinder (10). Further, by being removed from the external nostril (31) and remaining held by the flexible tube or cylinder (10), it becomes possible to shorten the time for guiding and inserting the insertion tube (41) of the transnasal endoscope.

[0061] (Guidance of Transnasal Endoscope) The flexible tube or cylinder (10) guides the insertion tube (41) of the transnasal endoscope. In the present invention, since the insertion tube (41) of the transnasal endoscope can be inserted along the flexible tube or cylinder (10) left in the selected transnasal route in the nasal cavity, regardless of the experience value and skill value of the operator (veterinarian, doctor, etc.), the transnasal endoscope can be easily guided and inserted into the appropriately pre-treated selected transnasal route in the nasal cavity. As a result, it is possible to achieve, at a high level, reduction of the mental burden on the operator, shortening of the transnasal endoscope insertion time, reduction of the physical burden (pain and injury) on the animal to be treated, and suppression of the mental burden (sense of oppression, anxiety, etc.).

[0062] [Inducing Device 2 for Transnasal Endoscope] In another aspect of the present invention, an inducing device 2 for a transnasal endoscope can be proposed. The inducing device 2 for a transnasal endoscope according to the present invention is obtained (replaced) by adopting the following invention-specific matters in the inducing device 1 for a transnasal endoscope according to the present invention. The flexible tube or cylinder is inserted from the external nostril and inserted to any one of the positions of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet, The flexible cannula is guided to the inserted flexible tube or cylinder and inserted to any position of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet.

[0063] That is, the nasal endoscope guiding device 1 first inserts a flexible cannula (1) into the nasal cavity, and then inserts a flexible tube or cylinder (10) to guide the insertion tube (41) of the nasal endoscope. In contrast, the nasal endoscope guiding device 2 first inserts a flexible tube or cylinder (10), and then appropriately guides and inserts a flexible cannula (1) into the nasal cavity to guide the insertion tube (41) of the nasal endoscope. Therefore, the content of the nasal endoscope guiding device 2 is the same as the matters described in [nasal endoscope guiding device 1] except for adopting (replacing) the above invention specific matters.

[0064] (Flexible tube or cylinder) In the present invention, the 'flexible tube or cylinder (10)' is inserted from the external naris (31) and inserted to any position of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet, and remains to guide the insertion of the insertion tube (41) of the nasal endoscope. The flexible tube or cylinder (10) may be used as an instrument for pretreatment. The content of the flexible tube or cylinder (10) is the same as that described in [nasal endoscope guiding device 1].

[0065] (Flexible cannula) In the present invention, the 'flexible cannula (1)' is guided to the inserted flexible tube or cylinder and inserted to any position of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet. The content of the flexible cannula (1) is the same as that described in [nasal endoscope guiding device 1].

[0066] (Induction of flexible cannula) "The flexible cannula is guided into the inserted flexible tube or cylinder", for example, the flexible cannula (1) is guided along the previously inserted flexible tube or cylinder (10) in a manner of being inserted; or, the flexible cannula (1) may be inserted and guided through the insertion hole (3) of the flexible cannula (1) to the outer nostril side end (without the attachment site (17)) of the previously inserted flexible tube or cylinder (10).

[0067] <Pretreatment> According to a preferred embodiment of the present invention, pretreatment can be performed. For example, pretreatment can be performed before and after the insertion of the flexible tube or cylinder (10). The pretreatment is to administer a vasoconstrictor (such as naphazoline nitrate, tramazoline hydrochloride, tetrahydrozoline hydrochloride - prednisolone) from the external nostril (31), and also to administer a sedative, analgesic or anesthetic (midazolam, diazepam, propofol, dexmedetomidine, xylocaine, etc.) from the external nostril (31).

[0068] As a preferred embodiment of the pretreatment, pretreatment can be performed before inserting the flexible tube or cylinder (10). As a preferred embodiment thereof, after performing a pretreatment of applying a vasoconstrictor, sedative, analgesic or anesthetic, etc. to the outer peripheral surface and the hollow inner peripheral surface of the flexible tube (10), or after performing a pretreatment of applying a vasoconstrictor, sedative, analgesic or anesthetic, etc. to the outer peripheral surface of the flexible cylinder (10), the flexible tube or cylinder (10) can be inserted from the external nostril (31). Also, as another embodiment, pretreatment can be performed after inserting the flexible tube (10). For example, pretreatment can be performed by connecting a syringe (20) to the attachment site (17) of the flexible tube (10).

[0069] By performing pretreatment, it is possible to prevent nasal bleeding and reduce the pain of scratches on the inner wall of the nasal cavity, widen the external nostrils (31), improve the passage in the nasal cavity, and facilitate the insertion of the flexible tube or cylinder (10) and then the flexible cannula. As a result, it is possible to achieve, at a high level, reduction of the mental burden on the operator, shortening of the transnasal endoscope insertion time, reduction of the physical burden (pain and injury) on the animal subject, and suppression of the mental burden (sense of oppression, uneasiness, etc.).

[0070] 〔Transnasal Endoscope Induction Kit 1 and 2〕 As shown in Fig. 1, the transnasal endoscope induction kits 1 and 2 include a flexible cannula (1), a flexible tube or cylinder (10), and a syringe (not shown) as required. As shown in Fig. 1, the flexible cannula, the flexible tube or cylinder, and the syringe (not shown) may be individually housed in containers. Also, as shown in Fig. 2, the transnasal endoscope induction kit may be a container housing an integrally formed unit obtained by connecting a flexible cannula (1), a flexible tube or cylinder (10), and a syringe (syringe: 20) as required.

[0071] The contents of the flexible cannula (1), the flexible tube or cylinder (10), and the syringe (syringe: 20) are the same as those described in 〔Transnasal Endoscope Induction Tool 1〕 and 〔Transnasal Endoscope Induction Tool 2〕.

[0072] 〔Transnasal Endoscope Induction System 1〕 In the present invention, a transnasal endoscope induction system 1 can be proposed. The transnasal endoscope induction system 1 according to the present invention first inserts a flexible cannula (1) into the nasal cavity (Fig. 3), and then inserts a flexible tube or cylinder (10) through the hollow tube of the flexible cannula (1) to guide the insertion tube (41) of the transnasal endoscope (Fig. 4).

[0073] The contents of the transnasal endoscope induction system 1 can be described with reference to Fig. 4. The nasal endoscope guiding system 1 first prepares a flexible cannula (1) and a flexible tube or cylinder (10).

[0074] (Insertion of the flexible cannula) As shown in FIG. 4(I), the flexible cannula (1) is inserted from the external nostril (31) to any position of the middle meatus position, the inferior meatus position, the esophageal inlet, or the tracheal inlet. The content of the flexible cannula (1) is the same as that described in [Nasal Endoscope Inductor 1].

[0075] <Pre-treatment> According to a preferred embodiment of the present invention, pre-treatment can be performed before and after inserting the flexible cannula (1). The content is the same as that described in [Nasal Endoscope Inductor 1].

[0076] (Insertion of the flexible tube or cylinder) As shown in FIG. 4(II), the flexible tube or cylinder (10) is inserted from the insertion site (7) of the flexible cannula and inserted through the insertion hole (3) to any position of the middle meatus, the inferior meatus, the esophageal inlet, or the tracheal inlet. The specific content of the flexible tube or cylinder (10) is the same as that described in [Nasal Endoscope Inductor 1].

[0077] (Removal of the flexible cannula) As shown in FIG. 4(III), after inserting the flexible tube or cylinder (10), the flexible cannula (1) is removed from the external nostril (31). By removing the flexible cannula (1), it is possible to facilitate the guiding of the insertion tube (41) of the nasal endoscope by the flexible tube or cylinder (10). Further, in a preferred embodiment of the present invention, the flexible cannula may be removed from the external nostril (31) and remain held by the flexible tube or cylinder (10). By remaining held by the flexible tube or cylinder (10), it is possible to shorten the time for guiding and inserting the insertion tube (41) of the nasal endoscope.

[0078] (Induction of a transnasal endoscope) As shown in Fig. 4(IV), the flexible tube or cylinder (10) guides the insertion tube (41) of the transnasal endoscope. By following the flexible tube or cylinder (10) left in the selected nasal cavity route, the insertion tube (41) of the transnasal endoscope can be inserted. Therefore, regardless of the experience and skill levels of the operator (veterinarian, doctor, etc.), the transnasal endoscope can be easily guided and inserted into the appropriately pre-treated selected nasal cavity route. As a result, it is possible to achieve, at a high level, reduction of the mental burden on the operator, shortening of the transnasal endoscope insertion time, reduction of the physical burden (pain and injury) on the animal subject to the procedure, and suppression of the mental burden (feeling of pressure, uneasiness, etc.).

[0079] 〔Induction system 2 for transnasal endoscope〕 In the present invention, an induction system 2 for a transnasal endoscope can be proposed. The induction system 2 for a transnasal endoscope according to the present invention first inserts a flexible tube or cylinder (10) into the nasal cavity (Fig. 5), and then inserts a flexible cannula (1) to guide the insertion tube (41) of the transnasal endoscope (Fig. 6).

[0080] The content of the induction system 2 for a transnasal endoscope can be described with reference to Fig. 6. The induction system 2 for a transnasal endoscope first prepares a flexible cannula (1) and a flexible tube or cylinder (10). The content of the flexible cannula (1) and the flexible tube or cylinder (10) is the same as that described in 〔Induction tool 1 for transnasal endoscope〕and 〔Induction tool 2 for transnasal endoscope〕.

[0081] (Insertion of a flexible tube or cylinder) As shown in Fig. 6(I), insert a flexible tube or cylinder (10) from the external nostril (31) to any position among the middle nasal meatus position, the inferior nasal meatus position, the esophageal inlet, or the tracheal inlet. Due to the inserted flexible tube or cylinder (10), it becomes possible to easily insert the flexible cannula (1). The specific content of the flexible tube or cylinder (10) is the same as that described in [Inductive Device 1 for Transnasal Endoscope] and [Inductive Device 2 for Transnasal Endoscope].

[0082] <Pretreatment> According to an aspect of the present invention, pretreatment can be performed before inserting the flexible tube or cylinder (10). The content is the same as that described in [Inductive Device 2 for Transnasal Endoscope].

[0083] (Insertion of Flexible Cannula) As shown in Fig. 6(II), guide the flexible cannula (1) through the insertion hole (3) to the inserted flexible tube or cylinder (10) and insert it to any position among the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet.

[0084] <Pretreatment> According to a preferred aspect of the present invention, pretreatment can be performed before and after inserting the flexible cannula (1). The content is the same as that described in [Inductive Device 1 for Transnasal Endoscope].

[0085] (Removal of Flexible Cannula) As shown in Fig. 6(III), after inserting a flexible tube or cylinder (10), the flexible cannula (1) is removed from the external nostril (31). By removing the flexible cannula (1), the flexible tube or cylinder (10) can easily guide the insertion tube (41) of the transnasal endoscope. In a preferred embodiment of the present invention, the flexible cannula (1) may be removed from the external nostril (31) and remain held by the flexible tube or cylinder (10). By remaining held by the flexible tube or cylinder (10), it becomes possible to shorten the time for guiding and inserting the insertion tube (41) of the transnasal endoscope.

[0086] (Induction of Transnasal Endoscope) As shown in Fig. 6(IV), the flexible tube or cylinder (10) guides the insertion tube (41) of the transnasal endoscope. Following the flexible tube or cylinder (10) left in the selected transnasal route in the nasal cavity, the insertion tube (41) of the transnasal endoscope can be inserted. Thus, regardless of the experience and skill levels of the operator (veterinarian, doctor, etc.), the transnasal endoscope can be easily guided and inserted into the appropriately pre-treated selected transnasal route in the nasal cavity. As a result, it is possible to achieve, at a high level, reduction of the mental burden on the operator, shortening of the transnasal endoscope insertion time, reduction of the physical burden (pain and injury) on the animal subject to the procedure, and suppression of the mental burden (sense of oppression, uneasiness, etc.).

Explanation of Reference Numerals

[0087] 1 Flexible cannula 3 Insertion hole 5 Opening 7 Insertion site 10 Flexible tube or cylinder 17 Mounting site 20 Syringe 30 Head 31 External nostril 32 Middle nasal meatus 34 Nasal cavity 36 Oropharynx 41 Insertion tube of transnasal endoscope

Claims

1. An intranasal endoscope guiding device comprising: a flexible cannula and a flexible tube or cylinder; wherein the flexible cannula has a length extending from the external nostril to any one of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; the insertion-side tip of the flexible cannula has a cylindrical shape and is provided with an insertion hole obliquely cut from near the apex of the cylindrical shape to the side surface; the external nostril-side end of the flexible cannula is provided with an insertion site; the flexible cannula is inserted from the external nostril and inserted to any one of the positions of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; the flexible tube or cylinder is inserted from the insertion site of the flexible cannula, inserted through the insertion hole, and inserted to any one of the positions of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; after inserting the flexible tube or cylinder, the flexible cannula is removed from the external nostril; the flexible tube or cylinder is an intranasal endoscope guiding device for guiding the insertion tube of an intranasal endoscope.

2. An intranasal endoscope guiding device comprising: a flexible cannula and a flexible tube or cylinder; wherein the flexible cannula has a length extending from the external nostril to any one of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; the insertion-side tip of the flexible cannula has a cylindrical shape and is provided with an insertion hole obliquely cut from near the apex of the cylindrical shape to the side surface; the external nostril-side end of the flexible cannula is provided with an insertion site; the flexible tube or cylinder is inserted from the external nostril and inserted to any one of the positions of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; the flexible cannula is guided by the inserted flexible tube or cylinder and inserted to any one of the positions of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; the inserted flexible cannula is removed from the external nostril; the flexible tube or cylinder is an intranasal endoscope guiding device for guiding the insertion tube of an intranasal endoscope.

3. The nasal endoscope guiding device according to claim 1 or 2, wherein the flexible cannula is removed from the external nostril and remains held in the flexible tube or cylinder.

4. A nasal endoscope guiding device kit, comprising: a flexible cannula and a flexible tube or cylinder; The flexible cannula: has a length from the external nostril to any part of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; the insertion-side tip of the flexible cannula has a cylindrical shape and is provided with an insertion hole obliquely cut with respect to the side surface near the apex of the cylindrical shape; the external-nostril-side end of the flexible cannula is provided with an insertion site; the flexible cannula is inserted from the external nostril and inserted to any position of the middle nasal meatus position, the inferior nasal meatus position, the esophageal inlet, or the tracheal inlet; the flexible tube or cylinder is inserted from the insertion site of the flexible cannula, inserted through the insertion hole, and inserted to any position of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet; after the flexible tube or cylinder is inserted, the flexible cannula is removed from the external nostril; The flexible tube or cylinder guides the insertion tube of the nasal endoscope. A nasal endoscope guiding device kit.

5. A nasal endoscope guiding device kit, comprising: a flexible cannula and a flexible tube or cylinder; The flexible cannula: has a length from the external nostril to any part of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet; the insertion-side tip of the flexible cannula has a cylindrical shape and is provided with an insertion hole obliquely cut with respect to the side surface near the apex of the cylindrical shape; the nostril-side end of the flexible cannula is provided with an insertion site; the flexible tube or cylinder is inserted from the external nostril and inserted to any position of the middle nasal meatus position, the inferior nasal meatus position, the esophageal inlet, or the tracheal inlet; the flexible cannula is guided by the inserted flexible tube or cylinder and inserted to any position of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet; the inserted flexible cannula is removed from the external nostril. The flexible tube or cylinder is a guiding device for the insertion tube of a nasal endoscope, and it is a guiding tool kit for a nasal endoscope.

6. The flexible cannula is removed from the external nostril and remains held by the flexible tube or cylinder. The guiding tool kit for a nasal endoscope according to claim 4 or 5.

7. A guiding system for a nasal endoscope, providing a flexible cannula and a flexible tube or cylinder; The flexible cannula has a length from the external nostril to any one of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet, the insertion-side tip of the flexible cannula has a cylindrical shape and is provided with an insertion hole obliquely cut with respect to the side surface near the apex of the cylindrical shape, the external nostril-side end of the flexible cannula is provided with an insertion site, insert the flexible cannula from the external nostril to any one of the positions of the middle nasal meatus position, the inferior nasal meatus position, the esophageal inlet, or the tracheal inlet; insert the flexible tube or cylinder from the insertion site of the flexible cannula and insert it through the insertion hole to any one of the positions of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet; after inserting the flexible tube or cylinder, remove the flexible cannula from the external nostril; the flexible tube or cylinder guides the insertion tube of the nasal endoscope; A guiding system for a nasal endoscope comprising this.

8. A guiding tool system for a nasal endoscope, providing a flexible cannula and a flexible tube or cylinder; The flexible cannula has a length from the external nostril to any one of the middle nasal meatus, inferior nasal meatus, esophageal inlet, or tracheal inlet, the insertion-side tip of the flexible cannula has a cylindrical shape and is provided with an insertion hole obliquely cut with respect to the side surface near the apex of the cylindrical shape, the external nostril-side end of the flexible cannula is provided with an insertion site, insert the flexible tube or cylinder from the external nostril to any one of the positions of the middle nasal meatus position, the inferior nasal meatus position, the esophageal inlet, or the tracheal inlet; guide the flexible cannula to the inserted flexible tube or cylinder and insert it to any one of the positions of the middle nasal meatus, the inferior nasal meatus, the esophageal inlet, or the tracheal inlet; remove the inserted flexible cannula from the external nostril; The flexible tube or cylinder guides the insertion tube of the transnasal endoscope; A guiding system for a transnasal endoscope, comprising this.

9. The transnasal endoscope guiding system according to claim 7 or 8, further comprising removing the flexible cannula from the external nostril and leaving it held by the flexible tube or cylinder.

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