Inflatable laryngeal mask

Abstract

The utility model provides an inflatable laryngeal mask which comprises a breather pipe and a sealing air bag ring, the breather pipe is provided with a connecting part, the connecting part is located at the far end of the breather pipe, the connecting part is provided with a connecting plane, the sealing air bag ring is connected to the connecting plane, and when the sealing air bag ring is in an inflatable state, the sealing air bag ring is connected to the connecting plane. The projection of the peripheral wall of the sealing air bag ring on the connecting plane does not exceed the coverage area of the connecting plane, and the shore hardness of the material of the connecting part is higher than that of the material of the sealing air bag ring. Due to the limiting constraint of the connecting plane made of a hard material, inflation pressure is more effectively applied to the position facing the throat of a patient to generate deformation, so that the sealing effectiveness is ensured, and compared with the structure that the back face of an air bag ring is not provided with a positioning constraint structure in the prior art, the sealing effect of the air bag ring is more ideal.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical device design, and in particular relates to an inflatable laryngeal mask. Background Art

[0002] As a supraglottic ventilation device, the laryngeal mask is an artificial airway and is widely used in clinical practice due to its advantages such as simple operation, high success rate and low damage. The laryngeal mask is an artificial airway device between a mask and an endotracheal tube, which allows patients to maintain spontaneous breathing and implement positive pressure ventilation. With the development of visualization technology, fiberoptic bronchoscopy is being used more and more widely in clinical practice. And with the development of comfortable medical care, the number of patients undergoing fiberoptic bronchoscopy under general anesthesia, that is, painless fiberoptic bronchoscopy, is increasing year by year, and the application of laryngeal masks is becoming more and more widespread.

[0003] The existing inflatable laryngeal mask is composed of a sealing airbag ring, a connecting piece, a ventilating tube, an inflating tube, an indicating airbag, a joint and an inflating valve. The ventilation tube penetrates the uppermost end of the connector and enters the interior of the connector and is firmly combined with it. The sealing airbag ring is attached to the edge of the lower end (i.e., the distal end in the use state) of the connector. When the sealing airbag ring is in an inflated state, the expanded sealing airbag can contact the patient's laryngeal airway wall to form a mask body sealing structure. Medical staff can press the indicator airbag to determine whether the inflation pressure in the sealing airbag ring is in an ideal sealing state. However, during the use of the existing inflatable laryngeal mask, the utility model author found that in many cases, pressing the indicator airbag indicates that the inflation pressure in the sealing airbag ring is sufficient. However, during actual application, the utility model author found that when the end-tidal carbon dioxide (ETCO2) and pulse oxygen saturation (SpO2) in the monitor reach normal values ​​or uses a stethoscope to listen to whether the patient has air leakage sounds, etc., it is found that when the inflation pressure in the indicator airbag is sufficient, the sealing airbag ring cannot form an ideal seal on the throat. In addition, the existing laryngeal mask may also cause compression to the parapharyngeal tissue after inflation. Long-term compression may cause swelling and pain of the parapharyngeal tissue. Utility Model Content

[0004] The utility model provides an inflatable laryngeal mask, which can solve the technical problems that during use of the inflatable laryngeal mask, an airbag indicates that the inflation pressure of a sealing airbag ring is sufficient, but the sealing airbag ring is not in an ideal sealing state, and the airbag of the existing structure is easy to cause compression to the parapharyngeal tissue in the inflated state.

[0005] In order to solve the above problems, the utility model provides an inflatable laryngeal mask, comprising a ventilation tube and a sealing airbag ring, the ventilation tube having a connecting portion, the connecting portion being located at the distal end of the ventilation tube, the connecting portion having a connecting plane, the sealing airbag ring being connected to the connecting plane, and when the sealing airbag ring is in an inflated state, the projection of the outer peripheral wall of the sealing airbag ring on the connecting plane does not exceed the coverage area of ​​the connecting plane, and the Shore hardness of the material of the connecting portion is higher than the Shore hardness of the material of the sealing airbag ring.

[0006] In some embodiments, when the sealing airbag ring is in the inflated state, a gap s is provided between a projection of an outer peripheral wall of the sealing airbag ring on the connecting plane and an outer edge of the connecting plane, and 0 mm ≤ s ≤ 1.5 mm.

[0007] In some embodiments, the sealing airbag ring is glued to the connecting plane; and / or the thickness of the wall of the sealing airbag ring is smaller on a side away from the connecting plane than on a side close to the connecting plane.

[0008] In some embodiments, the mating surface of the sealing airbag ring facing the connecting plane has a plurality of grooves extending perpendicularly to the length extension direction of the ventilation tube, and the mating surface of the connecting plane facing the sealing airbag ring has a plurality of ridges extending perpendicularly to the length extension direction of the ventilation tube, and each of the ridges is embedded in the grooves one by one to form an anti-slip positioning structure.

[0009] In some embodiments, the top area of ​​the sealing airbag ring has an inflation tube, the proximal end of the inflation tube is provided with an inflation check valve, an indicator airbag is provided on the pipeline between the inflation check valve and the sealing airbag ring, the indicator airbag is configured with a deflation port, the deflation port is provided with a first sealing cap, the first sealing cap can block the deflation port, and the first sealing cap is integrally connected to the indicator airbag.

[0010] In some embodiments, the proximal end of the ventilation tube has a main branch joint and a secondary branch joint, wherein the secondary branch joint is located in the length extension direction of the ventilation tube, and the secondary branch joint has a double sealing structure.

[0011] In some embodiments, the double sealing structure includes a second sealing cap capable of sealing an interface of the secondary branch joint and a sealing membrane located in the secondary branch joint, wherein a central area of ​​the sealing membrane has a self-sealing through hole.

[0012] In some embodiments, an angle a is formed between a central axis of the main branch joint and a central axis of the secondary branch joint, and 40°≤a≤60°; and / or the main branch joint has a limiting step.

[0013] In some embodiments, the wall thickness of the ventilation tube increases from the proximal end to the distal end; and / or the flow diameter of the ventilation tube decreases from the proximal end to the distal end.

[0014] In some embodiments, the ventilation hole formed by the sealing airbag ring has a triangular portion, and a sharp corner of the triangular portion faces the distal end of the ventilation tube.

[0015] The utility model provides an inflatable laryngeal mask with the following beneficial effects:

[0016] The sealing airbag ring is arranged within the connecting plane of the ventilation tube. When the laryngeal mask penetrates into the target position and the sealing airbag ring is inflated, the connecting part with a harder material blocks the dorsal side of the sealing airbag ring. At this time, the inflated sealing airbag ring expands and deforms toward the side away from the connecting part. That is, due to the limiting constraint of the connecting plane with a harder material, the inflation pressure is more effectively applied to the position toward the patient's throat to produce deformation, thereby ensuring the sealing effectiveness and limiting the expansion range of the mask bag, protecting the parapharyngeal tissue. Compared with the structure of the prior art that lacks positioning constraints on the back of the airbag ring, the utility model The sealing effect is more ideal, and at the same time, the air pressure in the bag increases, and the required gas input is smaller. When the airbag laryngeal mask is filled with gas, the protection of the pharynx and the pressure change at the indicator airbag are more obvious; in addition, it should be emphasized that the sealing airbag ring of the softer material in the utility model is connected to one side of the connecting plane of the harder material. In the process of inserting the laryngeal mask into the patient's target position, the connecting plane of the harder material can increase the rigidity of the sealing airbag ring when it is placed, thereby effectively preventing the sealing airbag ring from bending during the process, resulting in the inability to effectively achieve sealing during subsequent inflation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of an inflatable laryngeal mask according to an embodiment of the utility model;

[0020] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0021] Figure 3 for Figure 1 A cross-sectional view of an inflatable laryngeal mask;

[0022] Figure 4 A schematic diagram of the assembly position relationship between the inflatable airbag ring and the connecting portion of the ventilating tube in one embodiment;

[0023] Figure 5 It is a rear view of the connection portion between the inflatable airbag ring and the ventilation tube in another embodiment when the inflatable airbag ring is in an inflated state. It can be seen from the figure that the inflatable airbag ring in the inflated state is completely within the connection plane of the connection portion.

[0024] The reference numerals are:

[0025] 1. Ventilation pipe; 11. Connecting part; 12. Connecting plane; 2. Sealing airbag ring; 21. Inflation pipe; 22. Inflation one-way valve; 23. Indicating airbag; 231. Deflating port; 232. First sealing cap; 24. Ventilation hole; 241. Triangular part; 31. Main branch joint; 311. Limiting step; 32. Secondary branch joint; 321. Secondary sealing cap; 322. Sealing diaphragm; 323. Self-sealing through hole. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0029] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0030] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0031] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0032] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0033] See also Figures 1 to 5 As shown, according to an embodiment of the utility model, an inflatable laryngeal mask is provided, comprising a ventilation tube 1 and a sealing airbag ring 2, wherein the ventilation tube 1 has a connecting portion 11, wherein the connecting portion 11 is located at the distal end of the ventilation tube 1, wherein the connecting portion 11 has a connecting plane 12, wherein the sealing airbag ring 2 is connected to the connecting plane 12, wherein the ventilation tube 1 has a ventilation channel, wherein the ventilation hole 24 of the sealing airbag ring 2 is located at the outlet position of the ventilation channel, and when the sealing airbag ring 2 is in an inflated state, the projection of the outer peripheral wall of the sealing airbag ring 2 on the connecting plane 12 does not exceed the coverage area of ​​the connecting plane 12, that is, the outer peripheral wall contour of the sealing airbag ring 2 in the inflated state is within the connecting plane 12 or at most coincides with the outer edge contour of the connecting plane 12, and the Shore hardness of the material of the connecting portion 11 is higher than that of the sealing airbag ring 2. The Shore hardness of the material of the bag ring 2 is that the material of the connecting part 11 is silicone with a Shore hardness of 45-70, and the material of the sealing airbag ring 2 is silicone with a Shore hardness of 30-60, with a wall thickness of 0.5-1.2mm, and the larger the wall thickness is, the lower the hardness value is, that is, the connecting part 11 is made of a harder material, and the sealing airbag ring 2 is made of a softer material. It should be noted that the aforementioned harder material and softer material are relative, and do not mean that the harder material must be a hard material, and the softer material must be a soft material. For example, in order to ensure the deformability and sealing effect of the sealing airbag ring 2, its material is made of a material with greater flexibility. At the same time, in order to prevent the ventilation tube 1 from causing adverse damage to the patient's body and improve the patient's comfort, its material also uses a material with a certain flexibility, but its deformation resistance should be stronger than that of the sealing airbag ring 2.

[0034] In this technical solution, the sealing airbag ring 2 is arranged within the connecting plane 12 of the ventilation tube 1. When the laryngeal mask penetrates into the target position and the sealing airbag ring 2 is inflated, the connecting part 11 made of a harder material blocks the dorsal side of the sealing airbag ring 2. At this time, the inflated sealing airbag ring 2 expands and deforms toward the side away from the connecting part 11. That is, due to the limiting constraint of the connecting plane 12 made of a harder material, the inflation pressure is more effectively applied to the position toward the patient's throat to produce deformation, thereby ensuring the effectiveness of the seal and limiting the expansion range of the airbag, protecting the parapharyngeal tissue. Compared with the structure of the airbag ring on the back in the prior art that lacks positioning constraints, the sealing effect of the utility model is more ideal; at the same time, the air pressure in the airbag increases, the required gas input is smaller, and the doctor's During the operation, when the laryngeal mask airbag, that is, the sealing airbag ring 2 is filled with gas, it can provide protection to the pharynx, and the pressure change at the indicator airbag is more obvious (in the prior art, doctors usually press the indicator airbag to quickly determine whether the airbag has achieved an ideal seal, while using machines or stethoscopes takes a long time, which increases the operation time); in addition, it should be emphasized that the sealing airbag ring 2 of a softer material in the utility model is connected to one side of a connecting plane 12 of a harder material. In the process of inserting the laryngeal mask into the target position of the patient, the connecting plane 12 of the harder material can enhance the rigidity of the sealing airbag ring 2 when it is placed, thereby effectively preventing the sealing airbag ring 2 from bending during the process, resulting in the inability to effectively achieve sealing during subsequent inflation.

[0035] It can be understood that the sealing airbag ring 2 in the present application is objectively a plane matching the aforementioned connecting plane 12 on one side when inflated, and a convex arc-shaped surface on the other side, which can be roughly called a semi-bag shape, while the sealing airbag ring 2 in the prior art is objectively a convex arc-shaped surface roughly symmetrical on both sides when inflated, which can roughly become a full bag shape.

[0036] In a specific embodiment, see Figure 4 As shown, the outer peripheral wall contour of the sealing airbag ring 2 in the inflated state coincides with the outer peripheral contour of the connecting plane 12, that is, when the sealing airbag ring 2 is projected onto the connecting plane 12, the projections of the outermost wall contours of the two coincide. In order to reduce the machining accuracy requirements for the sealing airbag ring 2, in some embodiments, when the sealing airbag ring 2 is in the inflated state, there is a gap s between the projection of the outer peripheral wall of the sealing airbag ring 2 on the connecting plane 12 and the outer edge of the connecting plane 12, 0mm≤s≤1.5mm. It should be noted that s being in the aforementioned range can reduce the machining accuracy requirements for the sealing airbag ring 2 while also preventing the flow area of ​​the vent hole 24 of the sealing airbag ring 2 from being too small or the radial width of the sealing airbag ring 2 from being too small.

[0037] In a specific embodiment, the sealing airbag ring 2 is glued to the connecting plane 12. The sealing airbag ring 2 is connected to the connecting plane by gluing, which is convenient to operate and reduces the processing requirements for the structure.

[0038] As a preferred embodiment, the thickness of the wall of the sealing airbag ring 2 is smaller on the side away from the connecting plane 12 than on the side close to the connecting plane 12, that is, the thickness of the wall matched with the connecting plane 12 is greater than the thickness of the wall on the other side. Through this unequal design of the wall thickness, it can be ensured that the expansion deformation of the sealing airbag ring 2 is guided toward the sealing side (that is, the side corresponding to the patient's throat) during inflation, further ensuring the effectiveness of the seal generated by the inflation pressure. Furthermore, the aforementioned wall thickness should change gradually to prevent a sudden change in the wall thickness from causing stress concentration and thus reducing its service life.

[0039] More preferably, at this time, a plurality of grooves extending perpendicularly to the length extension direction of the ventilation tube 1 are provided on the mating surface of the sealing airbag ring 2 facing the connecting plane 12 (not shown in the figure), and a plurality of convex strips extending perpendicularly to the length extension direction of the ventilation tube 1 are provided on the mating surface of the connecting plane 12 facing the sealing airbag ring 2 (not shown in the figure), and each of the convex strips and the grooves are embedded in a one-to-one correspondence to form an anti-slip positioning structure (not shown in the figure). It can be understood that the length extension direction of the aforementioned ventilation tube 1 is also the plug-in and unplug direction of the laryngeal mask during use. The cooperation of the aforementioned convex strips and grooves in this technical solution can effectively prevent the contact with the patient's airway wall during the plug-in and unplug process, resulting in the phenomenon of separation between the sealing airbag ring 2 and the connecting part 11. At the same time, it is worth emphasizing that the design of the convex strips on the mating surface of the sealing airbag ring 2 can further increase the thickness and deformation resistance of the corresponding side, which can further guide the inflation pressure to the deformation force effectiveness of the sealing side of the sealing airbag ring 2, thereby improving the sealing effect.

[0040] See Figure 1As shown, the top region of the sealing airbag ring 2 has an inflation tube 21, the proximal end of the inflation tube 21 is provided with an inflation check valve 22, and the pipeline between the inflation check valve 22 and the sealing airbag ring 2 is provided with an indicator airbag 23. As is well known in the industry, medical staff confirm whether the inflation pressure of the sealing airbag ring 2 in the patient's body is sufficient by pressing the indicator airbag 23. Different from the prior art, the indicator airbag 23 is constructed with a deflation port 231. The deflation port 23 1 has a first sealing cap 232, the first sealing cap 232 can block the deflation port 231, and the first sealing cap 232 is integrally connected to the indicator airbag 23. During the inflation process, the first sealing cap 232 is in a state of blocking the deflation port 231. When the laryngeal mask needs to be pulled out after use, the medical staff can pull out the first sealing cap 232 from the deflation port 231, thereby achieving the purpose of one-button deflation and simplifying the operation steps and time when the laryngeal mask is pulled out.

[0041] The inventor of the utility model discovered that the fiber bronchoscope diagnosis and treatment operation channel in the double-branch joint laryngeal mask is not sealed. When supplying oxygen to the patient, oxygen will leak from the channel, and the patient cannot achieve a good oxygen supply effect. Based on the above-mentioned deficiencies in the prior art, in some embodiments, the proximal end of the ventilation tube 1 has a main branch joint 31 and a secondary branch joint 32. It can be understood that the main branch joint 31 is used to form a connection with the tracheal outlet of an external ventilator or anesthesia machine, and the secondary branch joint 32 is used to insert medical devices such as a fiber bronchoscope according to actual needs during use. The secondary branch joint 32 is located in the length extension direction of the ventilation tube 1, which can meet the technical requirement that medical devices such as a fiber bronchoscope should not be bent too much during use. As a preferred solution, the secondary branch joint 32 has a double sealing structure to reduce the leakage of oxygen to the outside when inserting medical devices such as a fiber bronchoscope into the ventilation tube 1. Specifically, in combination with reference to Figure 1 and Figure 3 As shown, the double sealing structure includes a second sealing cap 321 capable of sealing the interface of the secondary branch joint 32 and a sealing diaphragm 322 in the secondary branch joint 32. The central area of ​​the sealing diaphragm 322 has a self-sealing through hole 323. The self-sealing through hole 323 can be, for example, a through hole with a diameter that can be expanded by a medical device passing through and can rely on its own elastic force to restore to a sealed state after the medical device is taken out. It can also be other shapes, such as a cross slit, a cross slit, etc. When there is no need to insert the aforementioned bronchoscope and other medical devices, the second sealing cap 321 is used to seal the interface. When insertion is required, the aforementioned sealing diaphragm 322 can largely achieve the surrounding sealing of the outer peripheral wall of the inserted device, thereby effectively reducing the leakage of oxygen when the inserted bronchoscope and other medical devices enter the ventilation tube 1.

[0042] The main branch joint 31 and the secondary branch joint 32 can be integrally injection molded and can be formed of a hard material (such as hard plastic) and sleeved with the proximal end of the ventilation tube 1. The ventilation tube 1 is preferably made of soft material to reduce damage to the patient's oral cavity, while the joint made of hard material can enhance its support for the ventilation tube 1 and ensure smooth ventilation.

[0043] It can be understood that the indicator airbag 23 , the first sealing cap 232 and the second sealing cap 321 are all made of silicone material.

[0044] In some embodiments, an angle a is formed between the central axis of the main branch joint 31 and the central axis of the secondary branch joint 32, 40°≤a≤60°. If the angle is too small, the inspection channel operation will be affected, and if the angle is too large, the oxygen supply fluency at the oxygen supply joint will be affected.

[0045] The main branch joint 31 has a limiting step 311, which can cooperate with the breathing tube of a ventilator and other equipment to limit the position when in use, to prevent the insertion from being too shallow, resulting in insufficient connection firmness, and the insertion from being too deep, resulting in interference with the main channel and affecting operation.

[0046] In some embodiments, the wall thickness of the ventilation tube 1 increases from its proximal end to its distal end, which can significantly improve the structural strength of the ventilation tube 1 inserted into the patient's body and prevent the ventilation tube 1 from bending during the insertion process; the flow diameter of the ventilation tube 1 decreases from its proximal end to its distal end, which can facilitate the injection molding and demolding of the ventilation tube 1.

[0047] The inventor of the utility model also found that the shape of the vent hole 24 of the sealing airbag ring 2 in the prior art is designed to be leaf-shaped, which is suitable for the throat of foreign patients, but cannot play a good sealing effect on domestic patients. Based on the shortcomings of this prior art, see Figure 4 As shown, the ventilation hole 24 surrounded by the sealing airbag ring 2 has a triangular portion 241, and one sharp corner of the triangular portion 241 faces the distal end of the ventilation tube 1, so that the sealing airbag ring 2 of the utility model can be more suitable for the throat structure of Chinese people and form a good sealing and supporting structure in the throat.

[0048] The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the utility model should be included in the protection scope of the utility model. The above is only a preferred implementation of the utility model. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the utility model, and these improvements and variations should also be regarded as the protection scope of the utility model.

Claims

1. An inflatable laryngeal mask, comprising a ventilation tube (1) and a sealing airbag ring (2), wherein the ventilation tube (1) has a connecting portion (11), and the connecting portion (11) is located at the distal end of the ventilation tube (1), characterized in that: The connecting portion (11) has a connecting plane (12), the sealing airbag ring (2) is connected to the connecting plane (12), and when the sealing airbag ring (2) is in an inflated state, the projection of the outer peripheral wall of the sealing airbag ring (2) on the connecting plane (12) does not exceed the coverage area of ​​the connecting plane (12), and the Shore hardness of the material of the connecting portion (11) is higher than the Shore hardness of the material of the sealing airbag ring (2).

2. The inflatable laryngeal mask according to claim 1, characterized in that: When the sealing airbag ring (2) is in the inflated state, a gap s exists between the projection of the outer peripheral wall of the sealing airbag ring (2) on the connecting plane (12) and the outer edge of the connecting plane (12), 0mm≤s≤1.5mm.

3. The inflatable laryngeal mask according to claim 1, characterized in that: The sealing airbag ring (2) is glued to the connecting plane (12); and / or the thickness of the airbag wall of the sealing airbag ring (2) is smaller on the side away from the connecting plane (12) than on the side close to the connecting plane (12).

4. The inflatable laryngeal mask according to claim 3, characterized in that: The mating surface of the sealing airbag ring (2) facing the connecting plane (12) has a plurality of grooves extending perpendicularly to the length extension direction of the ventilation tube (1), and the mating surface of the connecting plane (12) facing the sealing airbag ring (2) has a plurality of convex strips extending perpendicularly to the length extension direction of the ventilation tube (1), and each of the convex strips is embedded in a one-to-one correspondence with the groove to form an anti-slip positioning structure.

5. The inflatable laryngeal mask according to claim 1, characterized in that: The top end region of the sealing airbag ring (2) is provided with an inflation tube (21), the proximal end of the inflation tube (21) is provided with an inflation check valve (22), an indicating airbag (23) is provided on the pipeline between the inflation check valve (22) and the sealing airbag ring (2), the indicating airbag (23) is configured with an air release port (231), the air release port (231) is provided with a first sealing cap (232), the first sealing cap (232) is capable of blocking the air release port (231), and the first sealing cap (232) is integrally connected to the indicating airbag (23).

6. The inflatable laryngeal mask according to claim 1, characterized in that: The proximal end of the ventilation tube (1) has a main branch joint (31) and a secondary branch joint (32), wherein the secondary branch joint (32) is located in the length extension direction of the ventilation tube (1), and the secondary branch joint (32) has a double sealing structure.

7. The inflatable laryngeal mask according to claim 6, characterized in that: The double sealing structure comprises a second sealing cap (321) capable of sealing the interface of the secondary branch joint (32) and a sealing membrane (322) located in the secondary branch joint (32), wherein the central area of ​​the sealing membrane (322) has a self-sealing through hole (323).

8. The inflatable laryngeal mask according to claim 6, characterized in that: An angle a is formed between the central axis of the main branch joint (31) and the central axis of the secondary branch joint (32), 40°≤a≤60°; and / or the main branch joint (31) has a limiting step (311).

9. The inflatable laryngeal mask according to claim 1, characterized in that: The wall thickness of the ventilation tube (1) increases from its proximal end to its distal end; and / or the flow diameter of the ventilation tube (1) decreases from its proximal end to its distal end.

10. The inflatable laryngeal mask according to claim 1, characterized in that: The ventilation hole (24) formed by the sealing airbag ring (2) has a triangular portion (241), and a sharp corner of the triangular portion (241) faces the distal end of the ventilation tube (1).

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