Patient interface

Abstract

The utility model relates to the technical field of medical instruments, in particular to a patient interface which comprises a shell, a filter layer and a flow guide part. The shell is provided with a pair of joints, and an accommodating cavity is formed in the shell between the pair of joints; the filter layer is fixed in the accommodating cavity and separates a pair of joints; the flow guide part structure is located in the connector, a first ventilation flow channel is formed in the flow guide part, the inner contour and the outer contour of the flow guide part are both in a conical surface shape, and the large opening end is located on the side deviating to the filter layer. The conical flow guide part is used for guiding and dispersing gas, so that part of the gas flows to the middle of the filter layer, part of the gas is diffused to the peripheral part of the filter layer, the gas is relatively uniformly dispersed, and the utilization rate of the filter layer is improved; and the dispersed air flow is combined with the profile inclination of the shell, so that the air can be diffused to the peripheral side after entering the shell, dead cavities can be effectively reduced, the use area of the filter layer is increased, and the situation that the air enters the shell and directly blows the filter layer, and the central position of the filter layer is consumed too quickly is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and particularly relates to a patient interface. Background Art

[0002] At present, a large number of clinical surgeries require delivering a mixture of air or oxygen from a ventilator to a patient's lungs through mechanical ventilation to assist or replace the patient's natural breathing process. Generally, a mechanical ventilation device consists of three parts: a ventilator, a gas pipeline, and a patient interface. The ventilator controls the gas flow rate, pressure, and respiratory rate. One end of the gas pipeline is connected to the ventilator, and the other end is connected to the patient interface and is used to deliver the gas from the ventilator to the patient through the gas pipeline.

[0003] During the use of the patient interface, the particles, viruses, and miscellaneous bacteria exhaled by the patient will be conducted to the ventilator and the gas pipeline. If different patients use it, cross-infection or repeated infection will occur. Therefore, a filtering structure needs to be installed. In the prior art, the defect of the patient interface with a filtering structure is that the inner wall of the structure is used to guide the gas flow. Due to the structural defect, dead spaces are likely to exist in the internal space, and the air flow distribution is uneven. After long-term use, the filtering layer is prone to the problem of local underutilization, and the effective utilization rate of the filtering layer cannot be guaranteed. Therefore, the utility model has developed a patient interface to solve the problems existing in the prior art. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a patient interface to solve the dead space problem caused by internal defects of the filtering structure for guiding air flow in the prior art.

[0005] The technical solution of the utility model is: a patient interface, comprising:

[0006] A housing having a pair of connectors, and an accommodation cavity is formed inside the housing between the pair of connectors;

[0007] A filtering layer fixed in the accommodation cavity and separating the pair of connectors;

[0008] A flow guide member, the structure of the flow guide member is located inside the connector, a first air flow channel is opened in the flow guide member, and a second air flow channel is formed between the outer wall of the flow guide member and the inner wall of the connector; the inner and outer contours of the flow guide member are both conical, and the large-mouth end is on the side closer to the filtering layer.

[0009] Preferably, the flow guide member is coaxially arranged with the connector, the flow guide member is in an eight-shaped cross-section along the section passing through the axis, and the outer wall of the flow guide member and the inner wall of the connector are fixedly connected by 2-6 ribs.

[0010] Preferably, the inner diameter of the housing corresponding to the accommodation cavity increases from the side of the joint to the side of the filter layer.

[0011] Preferably, a pair of the joints are both 1:40 taper joints and are used in cooperation with an external joint, and the external joint is also a 1:40 taper joint.

[0012] Preferably, a pair of the joints are both spiral joints, and spiral card slots are arranged on the wall surfaces of the spiral joints, and a limit card slot is arranged at the end of the spiral card slots along the screwing-in direction;

[0013] The joint is used in cooperation with an external joint with a convex block on the wall surface, and a sealing ring is abutted at the end of the joint or the external joint. The convex block enters the limit card slot along the spiral card slot and is abutted tightly in the limit card slot under the elastic action of the sealing ring.

[0014] Preferably, the spiral card slots are arranged on the outer walls of the joints, and the convex blocks are arranged on the inner walls of the external joints; a pair of convex ribs arranged in a ring shape are arranged on the outer wall of the housing, and the pair of convex ribs are coaxially arranged with the pair of joints respectively. A space for accommodating the sealing ring is formed between the convex ribs and the outer walls of the joints; the end of the external joint is abutted tightly against the sealing ring.

[0015] Preferably, a pair of the joints are used in cooperation with an external spiral joint. Spiral card slots and limit card slots are arranged on the wall surfaces of the spiral joint, and convex blocks are arranged on the wall surfaces of the joints; a sealing ring is abutted at the end of the joint or the external joint. The convex block enters the limit card slot along the spiral card slot and is abutted tightly in the limit card slot under the elastic action of the sealing ring.

[0016] Preferably, the convex blocks are arranged on the outer walls of the joints, and the spiral card slots are arranged on the inner walls of the external joints; a sealing ring is nested on the outer wall of the housing, and the end of the external joint is abutted tightly against the sealing ring.

[0017] Preferably, the external joint connected to one end of the joint is directly communicated with the patient end; the external joint connected to the other end of the joint is also cooperatively connected with a transfer joint, and a breathing tube joint is connected to the end of the transfer joint far from the external joint;

[0018] A first limit block distributed in a ring shape is arranged at the end of the transfer joint cooperating with the external joint, and a first limit groove arranged in a ring shape and for the first limit block to be embedded is arranged on the outer wall of the external joint;

[0019] A second limit groove is arranged on the wall surface at the end of the transfer joint cooperating with the breathing tube joint, and a second limit block cooperating with the second limit groove is arranged on the wall surface of the breathing tube joint.

[0020] Preferably, lugs facilitating insertion and extraction force application are provided on the outer wall of the external connector and / or the adapter.

[0021] Preferably, the housing includes a first housing and a second housing, and a pair of the connectors are integrally formed with the first housing and the second housing respectively;

[0022] The first housing and the second housing have connecting portions that are buckled with each other, and the connecting portions are in an annular structure.

[0023] Preferably, the first housing and the second housing both have sealing members located in the accommodation cavity. The sealing members are in an annular structure, with one end along the axial direction fixedly connected to the housing and the other end abutted tightly against the filter layer.

[0024] Preferably, a pair of the sealing members are arranged axially aligned, and the distance between the closer ends of the pair of the sealing members is less than the thickness of the filter layer in the normal state, and the filter layer is clamped.

[0025] Preferably, the filter layer is configured as a laminated structure or an inner and outer coating structure, and any one of a meltblown cloth layer and a glass fiber composite material layer is adopted.

[0026] Compared with the prior art, the advantages of the present utility model are as follows:

[0027] (1) A conical flow guide member is adopted, and a conical first air flow passage is opened inside it. Combining with the second air flow passage formed between the outer wall of the flow guide member and the inner wall of the connector, it is used to guide and disperse the gas, so that part of the gas flows to the middle of the filter layer, and part of the gas diverges to the peripheral part of the filter layer, ensuring relatively uniform gas dispersion, improving the utilization rate of the filter layer; and the dispersed air flow is set in combination with the contour slope of the housing, so that the gas can diffuse to the periphery after entering, which can effectively reduce the dead space, increase the use area of the filter layer, and prevent the gas from directly blowing the filter layer in the housing, so that the loss of the central position of the filter layer is too fast.

[0028] (2) A pair of sealing members clamp the filter layer, and a primary seal is formed at the clamping part. The connecting portion between the first housing and the second housing is fixed by ultrasonic welding to form a secondary seal. The double-layer seal can effectively prevent gas leakage and avoid the pollution of the equipment caused by the exhaled gas of the patient.

[0029] (3) By providing the filter layer, it can be used to isolate particles, viruses and miscellaneous bacteria, so that the ventilator and the gas pipeline can be used crosswise among different patients, reducing the use cost of the patients, and can also eliminate cleaning and disinfection, prolonging the service life of the ventilator and the gas pipeline. At the same time, after being used for a period of time, particles, viruses and miscellaneous bacteria will accumulate on the filter layer. The patient interface is directly replaced to prevent the particles, viruses and miscellaneous bacteria accumulated on the filter layer from causing repeated infections to the patients.

[0030] (4) The connector can either adopt a standard 1:40 taper connector, or a spiral connector, or be used in cooperation with an external spiral connector, so as to be applicable in different application scenarios; when adopting a 1:40 taper connector, it is used in quick insertion with an external 1:40 taper connector; when adopting a spiral connector or being used in cooperation with an external spiral connector, through the cooperation of the convex block with the spiral card slot and the limit card slot, and combined with the sealing ring, the sealing of the connection end is achieved. Description of the Drawings

[0031] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0032] Figure 1 An exploded view of a patient interface according to Embodiment 1 of the present utility model;

[0033] Figure 2 A cross-sectional view of a patient interface according to Embodiment 1 of the present utility model;

[0034] Figure 3 A structural schematic diagram of an external connector according to Embodiment 1 of the present utility model;

[0035] Figure 4 A schematic diagram of the connector adopting a spiral connector and being used in cooperation with an external connector according to Embodiment 1 of the present utility model;

[0036] Figure 5 A schematic diagram of the connector being used in cooperation with an external spiral connector in other embodiments of the present utility model;

[0037] Figure 6 A structural schematic diagram of a patient interface being connected to an external connector, an adapter connector and a breathing tube connector according to Embodiment 1 of the present utility model;

[0038] Figure 7 A cross-sectional view of a patient interface being connected to an external connector, an adapter connector and a breathing tube connector according to Embodiment 1 of the present utility model;

[0039] Figure 8 A gas flow distribution diagram inside the housing of a patient interface in the exhalation state according to Embodiment 1 of the present utility model;

[0040] Figure 9 A gas flow distribution diagram inside the housing of a patient interface in the inhalation state according to Embodiment 1 of the present utility model;

[0041] Figure 10 A cross-sectional view of a patient interface according to Embodiment 2 of the present utility model.

[0042] Figure 11Schematic diagram of the connection structure of a patient interface with an external connector, an adapter, and a breathing tube connector according to Embodiment 2 of the present utility model.

[0043] Among them: 1. Housing;

[0044] 11. First housing, 12. Second housing, 13. Accommodation cavity, 14. Connection part, 141. Embedded groove, 142. Limiting rib, 15. Sealing member, 16. Reinforcing rib, 17. Convex rib, 171. Sealing ring;

[0045] 2. Connector, 2a. Threaded connector, 2b. 1:40 taper connector;

[0046] 21. Threaded card slot, 22. Limiting card slot;

[0047] 3. Flow guide member;

[0048] 31. First air flow channel, 311. Second air flow channel, 32. Rib;

[0049] 4. Filter layer;

[0050] 5. External connector, 51. Convex block, 52. Convex ear;

[0051] 6. Adapter, 61. First limiting block, 62. First limiting groove, 7. Breathing tube connector, 71. Second limiting block, 72. Second limiting groove. Detailed implementation manners

[0052] The following further describes the content of the present utility model in detail with specific embodiments: Embodiment 1

[0053] As Figure 1 、 Figure 2 shown, a patient interface includes a housing 1, a filter layer 4, and a flow guide member 3.

[0054] The housing 1 is taken as a whole and can be set as a symmetrical structure. Taking the direction shown in Figure 2 as an example, the housing 1 is a vertically symmetrical structure and has a pair of connectors 2 symmetrically arranged up and down; an accommodation cavity 13 is formed inside the housing 1 between the pair of connectors 2; the filter layer 4 is fixed in the accommodation cavity 13 and separates the pair of connectors 2; the flow guide member 3 is located inside the connector 2, a first air flow channel 31 is provided inside the flow guide member 3, and a second air flow channel 311 is formed between the outer wall of the flow guide member 3 and the inner wall of the connector; the inner and outer contours of the flow guide member 3 are both conical, and the large-mouth end is on the side closer to the filter layer 4.

[0055] The flow guide member 3 is coaxially arranged with the joint 2. The flow guide member 3 is in a figure-eight shape along the cross-section passing through the axis. The outer wall of the flow guide member 3 is fixedly connected to the inner wall of the joint 2 through four rib strips 32. Of course, in other embodiments, other numbers of rib strips 32 can also be used, and the number is generally controlled within 2 - 6. The number of rib strips 32 should not be too many, otherwise it will affect the flow of the air current, nor should it be too few, otherwise the connection strength is insufficient. In this embodiment, by providing the flow guide member 3 with the first air flow channel 31, the air current can flow between the inner wall of the housing 1 and the outer wall of the flow guide member 3, as well as within the first air flow channel 31, ensuring that the gas can be more evenly dispersed within the housing 1.

[0056] Regarding the composition of the housing 1, it includes the first housing 11 and the second housing 12. A pair of joints 2 are integrally formed with the first housing 11 and the second housing 12 respectively; the first housing 11 and the second housing 12 have a connecting portion 14 that fits with each other. The connecting portion 14 is in an annular structure and is fixedly sealed by ultrasonic welding, effectively ensuring the sealing performance between the assembly ends of the first housing 11 and the second housing 12. It should be noted that the housing 1 as a whole is a symmetric structure, but in this embodiment, the first housing 11 and the second housing 12 themselves are not completely symmetric, mainly in the structure corresponding to the connecting portion 14. To ensure the tight fit between the two, an annularly distributed groove 141 is provided in the connecting portion 14 of the first housing 11, and a limiting rib 142 that cooperates with the groove 141 is provided in the connecting portion 14 of the second housing 12. After the limiting rib 142 cooperates with the groove 141, the assembly positioning is completed, and then the sealing fixation is achieved through ultrasonic welding.

[0057] In this embodiment, the inner diameter of the housing 1 corresponding to the accommodation cavity 13 increases from the side of the joint 2 to the side of the filter layer 4. That is to say, both the first housing 11 and the second housing 12 have an inner diameter that increases from the side of the joint 2 to the side of the filter layer 4, forming an inclined setting. Combined with the setting of the flow guide member 3, the gas can diffuse to the circumferential side after entering, which can effectively reduce the dead space, increase the usage area of the filter layer 4, and prevent the gas from directly blowing on the filter layer 4 when entering the housing 1, so as to avoid excessive loss at the central position of the filter layer 4.

[0058] As Figure 1 shown, the inner walls of the first housing 11 and the second housing 12 have reinforcing ribs 16 extending into the accommodation cavity 13. The reinforcing ribs 16 are distributed in a divergent shape, which is used to ensure the strength of the housing 1 itself and is not easily deformed.

[0059] As Figure 2 shown, the first housing 11 and the second housing 12 also have a sealing member 15 within the accommodation cavity 13. The sealing member 15 is in a columnar structure, and one end along the axis is fixedly connected to the housing 1. Generally, an integral molding method is used to ensure the sealing performance of the structure and the convenience of manufacturing; a pair of sealing members 15 are arranged axially aligned for installing the filter layer 4.

[0060] Regarding the filter layer 4, which is constructed as a laminated structure or an inner and outer coating structure, the specific surface area can be increased, and the structure can be any one of a melt-blown cloth layer and a glass fiber composite material layer. By setting the filter layer 4, it can be used to isolate particles, viruses, and miscellaneous bacteria, enabling the ventilator and gas pipeline to be used crosswise among different patients, reducing the usage cost of patients, and also eliminating the need for cleaning and disinfection, thereby prolonging the service life of the ventilator and gas pipeline. During installation, as Figure 2 shown, the filter layer 4 is clamped between a pair of seals 15. To ensure the stability of the connection, the distance between the closer ends of the pair of seals 15 is less than the thickness of the filter layer 4 under normal conditions. In the clamped state, the clamped part forms a primary seal; since the connection part 14 between the first housing 11 and the second housing 12 is fixed by ultrasonic welding, a secondary seal is formed; the double-layer seal can effectively prevent gas leakage, reducing the pollution of the equipment caused by the exhaled gas of patients and the infection of patients themselves by the inhaled gas.

[0061] Regarding the joint 2, in this embodiment, a pair of joints 2 both adopt screw joints 2a. A screw groove 21 is provided on the outer wall of the screw joint 2a, and a limit groove 22 is provided at the end of the screw groove 21 along the screwing-in direction; in the axial direction of the housing 1, the height of the limit groove 22 is higher than the height of the screw groove 21. Combining Figure 3 , Figure 4 shown, the joint 2 is used in cooperation with an external joint 5 having a convex block 51 at the inner wall. The convex block 51 enters the limit groove 22 along the screw groove 21 to realize the connection between the patient interface and the external device.

[0062] Since the height of the limit groove 22 is higher than the height of the screw groove 21, during the assembly process of the joint 2 and the external joint 5, after the convex block 51 moves along the screw groove 21 to the end, it enters the limit groove 22, which is equivalent to a return process. To ensure the connection tightness and sealing performance between the two, in this embodiment, as Figure 2 shown, a pair of convex ribs 17 arranged in a ring shape are provided on the outer wall of the housing 1. The pair of convex ribs 17 are coaxially arranged with the pair of joints 2 respectively. A space for accommodating the sealing ring 171 is formed between the convex ribs 17 and the outer wall of the joint 2. Furthermore, the sealing ring 171 can not only ensure the rebound of the external joint 5 after the convex block enters the limit groove 22, but also ensure the connection tightness between the joint 2 and the external joint 5 in this application.

[0063] Of course, in other embodiments, as Figure 5As shown, a pair of connectors 2 are used in cooperation with an externally connected screw connector. That is to say, at this time, the externally connected connector 5 is configured as a screw connector. The convex block 51 is arranged on the outer wall of the connector 2, and the screw slot 21 and the limit slot 22 are arranged on the inner wall of the externally connected connector 5. A sealing ring 171 is nested on the outer wall of the housing 1. During the assembly process, the convex block 51 enters the limit slot 22 along the screw slot 21. After the assembly is completed, since the end of the externally connected connector 5 abuts against the sealing ring 171, the convex block 51 is limited in the limit slot 22.

[0064] In the application scenario, one end of the patient interface is used to connect to the ventilator, and the other end is used to connect to the patient; as Figure 6 、 Figure 7 shown, one end of the patient interface connected to the ventilator is also cooperatively connected with an adapter joint 6. One end of the adapter joint 6 far from the externally connected connector 5 is connected with a breathing tube joint 7. The end of the adapter joint 6 cooperating with the externally connected connector is provided with a first limit block 61 distributed in a ring shape. The outer wall of the externally connected connector 5 has a first limit groove 62 arranged in a ring shape for the first limit block 61 to be embedded. Thus, relative rotation can occur between the externally connected connector 5 and the adapter joint 6, ensuring the convenience of application. The wall surface of the end of the adapter joint 6 cooperating with the breathing tube joint 7 is provided with a second limit groove 72, and the wall surface of the breathing tube joint 7 is provided with a second limit block 71 cooperating with the second limit groove 72. As Figure 6 shown, the outer wall of the externally connected connector 5 and / or the adapter joint 6 is provided with a lug 52 for facilitating the application of force during insertion and extraction, improving the convenience of use.

[0065] Furthermore, through the action of the externally connected connector 5, the adapter joint 6, and the breathing tube joint 7, the patient interface can achieve the air path connection between the ventilator and the patient. During the patient's breathing process, taking Figure 2 the direction shown as an example, it is assumed that the upper connector 2 is connected to the patient and the lower connector 2 is connected to the ventilator. As Figure 8 shown, when the patient exhales, the air flow direction is from top to bottom; as Figure 9 shown, when the patient inhales, the air flow direction is from bottom to top. Based on the setting of the flow guiding member 3 and the contour of the housing 1, the gas distribution in the entire housing 1 space is uniform. After being used for a period of time, particles, viruses, and miscellaneous bacteria will accumulate on the filter layer 4. At this time, the patient interface can be directly replaced to prevent the particles, viruses, and miscellaneous bacteria accumulated on the filter layer from causing repeated infections to the patient. When replacing, the externally connected connector 5 can be directly pulled out. Embodiment 2

[0066] As Figure 10 、 Figure 11 shown, a patient interface includes a housing 1, a filter layer 4, and a flow guiding member 3.

[0067] The difference between this embodiment and Embodiment 1 is that:

[0068] Both of the pair of connectors 2 adopt 1:40 taper connectors 2b and are used in cooperation with externally connected 1:40 taper connectors. The 1:40 taper connector 2b belongs to an international standard connector and is suitable for quickly establishing ventilation. It can be directly inserted and connected in the usage scenario.

[0069] In this embodiment, based on the setting of the 1:40 taper connector 2b, the tightness of the connection can already be satisfied during the insertion connection. Therefore, there is no need to set a sealing ring. Furthermore, compared with Embodiment 1, this embodiment does not need to set Figure 2 the convex rib 17 shown.

[0070] To sum up, in this application, by setting the conical flow guiding member 3 and opening a conical first air flow channel 31 inside it, combined with the slope setting of the inner wall of the housing 1, it is used to guide and disperse the gas, so that part of the gas flows to the middle of the filter layer 4, and part of the gas diverges to the peripheral part of the filter layer 4, ensuring relatively uniform gas dispersion and improving the utilization rate of the filter layer 4; by selecting patient interfaces with different connectors 2, it can be applied to different application scenarios, and the connection is fast and convenient to use.

[0071] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention. The purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention.

Claims

1. A patient interface, characterized in that: include: A shell (1), the shell (1) having a pair of joints (2), and an accommodating cavity (13) is formed inside the shell (1) between the pair of joints (2); A filter layer (4), the filter layer (4) being fixed in the accommodating cavity (13) and separating a pair of the joints (2); A flow guide (3), the flow guide (3) being located in the joint (2), the flow guide (3) being provided with a first air flow passage (31), and a second air flow passage (311) being formed between an outer wall of the flow guide (3) and an inner wall of the joint (2); the inner and outer contours of the flow guide (3) are both conical, and the large opening end is located on a side biased towards the filter layer (4).

2. A patient interface according to claim 1, characterized in that: The flow guide (3) is coaxially arranged with the joint (2); the cross section of the flow guide (3) along the axis is in an eight-shaped shape; the outer wall of the flow guide (3) and the inner wall of the joint (2) are fixedly connected via 2 to 6 ribs (32).

3. A patient interface according to claim 2, characterized in that: The inner diameter of the housing (1) corresponding to the accommodating cavity (13) increases gradually from the joint (2) side to the filter layer (4) side.

4. A patient interface according to claim 1, characterized in that: The pair of joints (2) both adopt 1:40 taper joints (2b) and are used in conjunction with an external joint (5), and the external joint (5) also adopts a 1:40 taper joint.

5. A patient interface according to claim 1, characterized in that: The pair of joints (2) both adopt a spiral joint (2a), a spiral groove (21) is provided on the wall surface of the spiral joint (2a), and a limit groove (22) is provided at the end of the spiral groove (21) along the screwing direction; The joint (2) is used in conjunction with an external joint (5) having a protrusion (51) on the wall surface; a sealing ring (171) is provided at the end of the joint (2) or the external joint (5); the protrusion (51) enters the limit groove (22) along the spiral groove (21) and is pressed against the limit groove (22) by the elastic action of the sealing ring (171).

6. A patient interface according to claim 5, characterized in that: The spiral groove (21) is arranged on the outer wall of the joint (2), and the protrusion (51) is arranged on the inner wall of the external joint (5); the outer wall of the housing (1) has a pair of convex ridges (17) arranged in an annular shape, the pair of convex ridges (17) are respectively arranged coaxially with the pair of joints (2), and a space for accommodating the sealing ring (171) is formed between the convex ridges (17) and the outer wall of the joint (2); the end of the external joint (5) is tightly pressed against the sealing ring (171).

7. A patient interface according to claim 1, characterized in that: A pair of the joints (2) are used in conjunction with an externally connected spiral joint, a spiral groove (21) and a limit groove (22) are provided on the wall surface of the spiral joint, and a protrusion (51) is provided on the wall surface of the joint (2); a sealing ring (171) is provided at the end of the joint (2) or the externally connected joint (5), and the protrusion (51) enters the limit groove (22) along the spiral groove (21) and is pressed against the limit groove (22) by the elastic action of the sealing ring (171).

8. A patient interface according to claim 7, characterized in that: The protrusion (51) is arranged on the outer wall of the joint (2), and the spiral groove (21) is arranged on the inner wall of the external joint (5); a sealing ring (171) is nested on the outer wall of the shell (1), and the end of the external joint (5) is tightly pressed against the sealing ring (171).

9. A patient interface according to claim 4, 5 or 7, characterized in that: The external connector (5) connected to one end of the connector (2) is directly connected to the patient end; the external connector (5) connected to the other end of the connector (2) is also cooperatively connected to an adapter connector (6); and the end of the adapter connector (6) away from the external connector (5) is connected to a breathing tube connector (7); One end of the adapter joint (6) that cooperates with the external joint (5) is provided with a first limiting block (61) distributed in an annular shape, and the outer wall of the external joint (5) is provided with a first limiting groove (62) arranged in an annular shape and for the first limiting block (61) to be embedded in; A second limiting groove (72) is provided on a wall surface of one end of the adapter joint (6) that cooperates with the breathing tube joint (7), and a second limiting block (71) that cooperates with the second limiting groove (72) is provided on a wall surface of the breathing tube joint (7).

10. A patient interface according to claim 9, characterized in that: The outer wall of the external joint (5) and / or the adapter joint (6) is provided with a lug for facilitating insertion and removal and applying force.

11. A patient interface according to claim 1, characterized in that: The shell (1) comprises a first shell (11) and a second shell (12), and a pair of joints (2) are respectively integrally formed with the first shell (11) and the second shell (12); The first shell (11) and the second shell (12) have a connecting portion (14) that engages with each other, and the connecting portion (14) is in an annular structure.

12. A patient interface according to claim 11, characterized in that: The first shell (11) and the second shell (12) both have a sealing member (15) located in the accommodating cavity (13); the sealing member (15) is an annular structure, one end of which is fixedly connected to the shell (1) in the axial direction, and the other end of which is tightly abutted against the filter layer (4).

13. A patient interface according to claim 12, characterized in that: A pair of the sealing members (15) are arranged in an axially aligned manner, and a distance between the ends of the pair of the sealing members (15) that are close to each other is smaller than the thickness of the filter layer (4) under normal conditions, and the filter layer (4) is clamped.

14. A patient interface according to claim 13, characterized in that: The filter layer (4) is constructed as a stacked structure or an inner-outer coated structure, and is made of any one of a meltblown cloth layer and a glass fiber composite material layer.

Images