Tracheal catheter and air bag inflation valve thereof

Abstract

The air bag inflation valve comprises a valve tube, a valve element and an elastic piece, a tube cavity is formed in the valve tube, the tube cavity penetrates through the two opposite ends of the valve tube, the valve element penetrates through the valve tube in a sliding mode, a gas flow channel is formed in the valve element, and one end of the gas flow channel penetrates through the end, located outside the tube cavity, of the valve element to form an insertion opening for an injector to be inserted in. The other end of the gas flow channel penetrates through the peripheral wall of the valve core to form a gas port; the elastic piece comprises a mounting seat and a plastic elastic piece, one end of the plastic elastic piece is fixedly connected with the mounting seat, the mounting seat is arranged in the pipe cavity, the plastic elastic piece elastically abuts against the end, located in the pipe cavity, of the valve element, so that the air port is located outside the pipe cavity, and the valve element can slide along the pipe cavity and extrude the plastic elastic piece under stress, so that the air port is located in the pipe cavity. The endotracheal tube has the advantages that shadows can be prevented from being formed on nuclear magnetic resonance images during nuclear magnetic resonance examination, an air bag inflation valve does not need to be separated from the air bag during examination, accordingly, operation procedures can be simplified, and risks of falling off of the endotracheal tube and infection of patients can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical tracheal tube technology, specifically to a tracheal tube and its airbag inflation valve. Background Technology

[0002] An endotracheal tube is a medical device inserted into a patient's trachea and / or bronchi to create a temporary artificial breathing channel, especially for patients unable to breathe independently. Common tube tips have one or two cuff-shaped inflatable cuffs, which, when inflated, secure the tube and seal the airway. The cuff is connected to an inflation valve via an inflation tube; specifically, one end of the inflation tube communicates with the cuff, and the other end is fixed to a pressure-response sleeve, on which the inflation valve is mounted. An airbag inflation valve typically includes a valve tube, a valve core, and a spring. The valve tube is fixed to the airbag pressure response sleeve and has a cavity communicating with the airbag. The valve core slides through the valve tube and has a gas passage within it. One end of the gas passage passes through the end of the valve core outside the cavity to form a port for inserting a syringe, and the other end passes through the peripheral wall of the valve core to form an air port. The spring is housed within the cavity and its two ends elastically abut against the valve tube and valve core, respectively, thus positioning the air port outside the cavity. During inflation, the syringe draws air and inserts its needle into the port, pushing the syringe towards the airbag pressure response sleeve. This causes the valve core to move closer to the airbag pressure response sleeve until the air port is located inside the valve tube. At this point, the gas passage communicates with the airbag pressure response sleeve through the cavity, and the spring is compressed. By pushing the syringe piston, the gas in the syringe enters the airbag through the gas passage, the cavity, the airbag pressure response sleeve, and the inflation tube. After inflation, the syringe is withdrawn from the valve core. The spring's restoring force keeps the air inlet outside the lumen, preventing gas from escaping from the balloon. When the balloon inflates, the balloon pressure response sleeve also inflates, and vice versa. Therefore, the balloon pressure response sleeve helps doctors assess the balloon's condition and avoids guesswork.

[0003] In existing technology, springs are made of metal. However, in practice, some patients with endotracheal tubes require MRI scans. During an MRI scan, the patient is anesthetized and needs to have the endotracheal tube in place. The metal spring will cast a shadow on the MRI image. If the doctor is not careful, this shadow can easily be mistaken for a pathological phenomenon, leading to incorrect examination results and affecting the diagnosis of the patient's condition.

[0004] To address this issue, Chinese invention patent application CN114225175A discloses a tracheal tube, which includes a cuff inflation tube and a clamp. The cuff inflation tube comprises a first inflation tube and a second inflation tube. The tracheal tube assembly includes the tracheal tube, a cuff, and a cuff inflation end. Typically, the first and second inflation tubes are connected, and the cuff inflation end is connected to the cuff, allowing for inflation or deflation of the cuff. When a patient undergoes an MRI examination with the tracheal tube, the clamp blocks airflow through the first inflation tube to ensure cuff inflation and airtightness. The first and second inflation tubes are separated to separate the metal spring at the cuff inflation end from the cuff, preventing the metal spring from casting a shadow on the MRI image and ensuring the cuff effectively seals the patient's airway. However, this tracheal tube has the following problems in use:

[0005] Firstly, when patients with this endotracheal tube undergo MRI examination, they need to first operate a clamp to block the airflow in the first inflation tube before pulling the first inflation tube out of the second inflation tube. This increases the preparation work before the MRI examination and there is a risk that the doctor may forget to pull the first inflation tube out of the second inflation tube due to being busy.

[0006] Secondly, after the first inflation tube is pulled out from the second inflation tube, the airbag pressure response sleeve is disconnected from the airbag, and the airbag pressure response sleeve cannot reflect the status of the airbag. If the airbag deflates unexpectedly, the doctor will not be able to know in time, which increases the risk of the endotracheal tube falling out.

[0007] Third, removing the first inflation tube from the second inflation tube increases the risk of losing the first inflation tube and it being contaminated by the outside world. After the examination is completed, removing the first inflation tube and inserting the second inflation tube increases the probability of infection for the patient. Summary of the Invention

[0008] The present invention aims to solve at least one of the above-mentioned technical problems by providing an airbag inflation valve that can avoid forming shadows on MRI images during MRI examinations, and eliminates the need to separate the airbag inflation valve from the airbag during the examination, thereby simplifying the operation process and reducing the risk of endotracheal tube dislodgement and patient infection.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] An inflator valve for a endotracheal tube includes a valve tube, a valve core, and an elastic element. The valve tube has a cavity extending through both ends. The valve core slidably passes through the valve tube and has a gas passage. One end of the gas passage extends through the end of the valve core outside the cavity to form a port for inserting a syringe, and the other end extends through the outer peripheral wall of the valve core to form an air port. The elastic element includes a mounting base and a plastic spring sheet fixedly connected to the mounting base at one end. The mounting base is installed inside the cavity, and the plastic spring sheet elastically abuts against the end of the valve core inside the cavity, thereby placing the air port outside the cavity. The valve core, under force, can slide along the cavity and compress the plastic spring sheet, so that the air port is placed inside the cavity.

[0011] Furthermore, one end of the plastic spring is connected to the end of the mounting base facing the valve core, and the other end of the plastic spring is spaced apart from the mounting base.

[0012] Furthermore, the plastic spring includes an arc-shaped connecting portion and an elastic arm, the elastic arm being connected to the mounting base through the arc-shaped connecting portion; the elastic arm elastically abuts against one end of the valve core located within the cavity, and the free end of the elastic arm is spaced apart from the mounting base.

[0013] Furthermore, there are two plastic springs, the arc-shaped connecting portions of the two plastic springs are arranged opposite to each other, and the elastic arms of the two plastic springs extend in opposite directions and are stacked and spaced apart along the axial direction of the valve tube.

[0014] Furthermore, the valve tube includes a tube body and an end cap connected to one end of the tube body, the tube cavity extends through the tube body and the end cap along the axial direction of the valve tube, and the mounting seat is clamped between the tube body and the end cap.

[0015] Furthermore, the end cap is detachably connected to the end of the tube body away from the insertion port via a thread.

[0016] Furthermore, the end cap is provided with a connecting hole and a mounting hole arranged along the axial direction of the valve tube and communicating with each other. The diameter of the mounting hole is larger than the diameter of the connecting hole so as to form a step at the connection between the mounting hole and the connecting hole. The tube body is inserted into the mounting hole and threadedly connected to the mounting hole. The mounting seat is placed in the mounting hole and sandwiched between the step and the tube body.

[0017] Furthermore, the mounting base is provided with a connecting hole; the tube body includes a sleeve and an end plate fixed to one end of the sleeve, the sleeve is provided with a receiving part, the receiving part is connected to the communicating hole through the connecting hole; the end cap is provided with a sliding hole, the sliding hole, the receiving part, the mounting hole and the communicating hole constitute the tube cavity; the valve core slides through the sliding hole.

[0018] Furthermore, the valve tube also includes a protective sleeve, which is fixed to one end of the end plate facing away from the tube sleeve. The protective sleeve has a receiving cavity, and the end of the valve core located outside the tube cavity is received in the receiving cavity.

[0019] This utility model also provides a tracheal tube including an airbag inflation valve of the tracheal tube.

[0020] By adopting the above technical solution, this utility model has the following beneficial effects:

[0021] 1. The above-mentioned airbag inflation valve uses a plastic spring instead of a metal spring to drive the valve core to reset, which can avoid forming shadows on the MRI image. Therefore, during the examination, there is no need to separate the airbag inflation valve from the airbag, which simplifies the operation process and reduces the risk of endotracheal tube dislodgement and patient infection.

[0022] 2. In the above-mentioned airbag inflation valve, one end of the plastic spring is connected to the mounting base, and the other end is spaced apart from the mounting base, thereby forming a space for the plastic spring to deform, reducing the probability of damage to the plastic spring due to pressure deformation, and extending the service life of the plastic spring.

[0023] 3. The above-mentioned airbag inflation valve includes two plastic springs. The elastic arms of the two plastic springs extend in opposite directions and are stacked and spaced along the axial direction of the valve tube. This can improve the support of the plastic springs for the valve core and make the valve core more evenly stressed.

[0024] 4. The above-mentioned airbag inflation valve includes a valve tube comprising a tube body and an end cap connected to one end of the tube body. The plastic spring mounting seat can be clamped between the stepped part of the end cap and the tube body through the threaded connection between the end cap and the tube body, thereby realizing the quick installation of the plastic spring. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the endotracheal tube according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the airbag inflation valve according to the first embodiment of the present invention;

[0027] Figure 3 for Figure 2 Top view;

[0028] Figure 4 for Figure 3 Sectional view along line AA;

[0029] Figure 5 This is a schematic diagram of the elastic element according to the first embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the elastic element according to the second embodiment of the present invention;

[0031] Figure 7 for Figure 6 Side view;

[0032] In the attached diagram, 10 is the gas delivery conduit; 20 is the airbag; 30 is the inflation tube; 40 is the airbag pressure response sleeve; 50 is the airbag inflation valve; 51 is the valve tube; 510 is the tube body; 511 is the tube sleeve; 512 is the receiving part; 513 is the end plate; 514 is the sliding hole; 515 is the end cap; 516 is the connecting hole; 517 is the mounting hole; 518 is the stepped part; 519 is the protective sleeve; 5190 is the receiving cavity; 52 is the valve core; 520 is the gas flow channel; 521 is the socket; 523 is the air port; 524 is the limiting flange; 525 is the guide flange; 53 is the elastic element; 531 is the mounting base; 532 is the connecting hole; 534 is the plastic spring; 535 is the arc-shaped connecting part; and 536 is the elastic arm. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] Please see Figure 1 The first embodiment of this utility model provides an endotracheal tube, including an air delivery tube 10, an air bag 20, an inflation tube 30, and an air bag pressure response sleeve 40. One end of the air delivery tube 10 is used to connect to a ventilator (not shown), and the other end of the air delivery tube 10 is used for insertion into the human airway (not shown). The air bag 20 is wrapped around the end of the air delivery tube 10 used for insertion into the human airway. One end of the inflation tube 30 is connected to the air bag 20, and the other end is fixedly connected to the air bag pressure response sleeve 40. The air bag pressure response sleeve 40 is equipped with an air bag inflation valve 50. The structure and connection of the air delivery tube 10, air bag 20, inflation tube 30, and air bag pressure response sleeve 40 in this embodiment are prior art and will not be described in detail here for brevity.

[0037] Please see also Figure 2 The airbag inflation valve 50 includes a valve tube 51, a valve core 52, and an elastic element 53. The valve tube 51 is fixedly connected to the airbag pressure response sleeve 40, the valve core 52 is slidably connected to the valve tube 51, and the elastic element 53 is installed inside the valve tube 51 and elastically resists the valve core 52. Both the valve tube 51 and the valve core 52 are made of non-metallic materials, such as rigid plastic.

[0038] Please see also Figure 3 and Figure 4The valve tube 51 has a cavity (not shown) that extends through both ends of the valve tube 51. In this embodiment, the valve tube 51 includes a tube body 510 and an end cap 515 connected to one end of the tube body 510. The tube body 510 is fixedly connected to the airbag pressure response sleeve 40. The cavity extends through the tube body 510 and the end cap 515 along the axial direction of the valve tube 51, and one end of the cavity is connected to the airbag pressure response sleeve 40. Specifically, the tube body 510 includes a sleeve 511 and an end plate 513 fixed to one end of the sleeve 511. The sleeve 511 has a receiving portion 512 that extends through the end of the sleeve 511 away from the end plate 513. The sleeve 511 is fixedly connected to the airbag pressure response sleeve 40. Specifically, the sleeve 511 passes through the airbag pressure response sleeve 40, and the outer wall of the sleeve 511 and the airbag pressure response sleeve 40 are sealed together by means of bonding or other methods. The end of the receiving part 512 away from the end plate 513 is connected to the airbag pressure response sleeve 40. The end plate 513 is provided with a sliding hole 514 communicating with the receiving part 512, and the diameter of the sliding hole 514 is smaller than the diameter of the receiving part 512. The end cap 515 is detachably connected to the end of the tube body 510 away from the sliding hole 514 by threads. Specifically, in this embodiment, the end cap 515 is provided with a connecting hole 516 and a mounting hole 517 arranged axially along the valve tube 51 and communicating with each other. The connecting hole 516 passes through the end cap 515 away from the tube body 510, and the mounting hole 517 passes through the end cap 515 near the tube body 510. The diameter of the mounting hole 517 is larger than the diameter of the connecting hole 516, so that a step portion 518 is formed at the connection between the mounting hole 517 and the connecting hole 516. The sliding hole 514, the receiving portion 512, the mounting hole 517, and the connecting hole 516 together constitute the tube cavity. The end of the tube body 510 away from the sliding hole 514 is inserted into the mounting hole 517 and threadedly connected to the mounting hole 517, so that the connecting hole 516, the mounting hole 517, the receiving portion 512, and the sliding hole 514 are sequentially connected along the axial direction of the valve tube 51.

[0039] In this embodiment, the valve tube 51 further includes a protective sleeve 519, which is fixed to one end of the end plate 513 facing away from the tube sleeve 511. The protective sleeve 519 has a receiving cavity 5190 inside, one end of which is connected to the sliding hole 514, and the other end of which passes through the end of the protective sleeve 519 away from the tube body 510.

[0040] The valve core 52 slides through the valve tube 51. In this embodiment, the valve core 52 is generally rod-shaped and passes through a sliding hole 514 on the end plate 513, such that one end of the valve core 52 is located inside the receiving portion 512 of the tube cavity, and the other end is located inside the receiving cavity 5190 outside the tube cavity. The outer peripheral wall of the valve core 52 contacts the hole wall of the sliding hole 514 to achieve a sealing effect. In this embodiment, a guide flange 525 is also provided on the outer peripheral wall of the valve core 52. The guide flange 525 is received inside the receiving portion 512 and slides in contact with the inner wall of the receiving portion 512, thereby making the sliding of the valve core 52 smoother. In addition, the cooperation between the guide flange 525 and the end plate 513 can limit the sliding position of the valve core 52 away from the end cover 515. The valve core 52 has a gas passage 520 inside. One end of the gas passage 520 passes through the end of the valve core 52 located outside the tube cavity to form a socket 521 for inserting a syringe. The other end of the gas passage 520 passes through the peripheral wall of the valve core 52 to form an air port 523. A limiting flange 524 is also provided on the outer peripheral wall of the valve core 52. The limiting flange 524 is received in the receiving cavity 5190 and is located on the side of the socket 521 facing away from the tube body 510. The outer diameter of the limiting flange 524 is larger than the inner diameter of the sliding hole 514. Through the cooperation between the limiting flange 524 and the end plate 513, the sliding position of the valve core 52 towards the end cap 515 can be limited.

[0041] Please see also Figure 5 The elastic element 53 includes a mounting base 531 and a plastic spring piece 534 fixedly connected to the mounting base 531 at one end. The mounting base 531 is made of a non-metallic material, such as rigid plastic, and is installed inside the tube cavity. In this embodiment, the mounting base 531 is placed in the mounting hole 517 of the end cap 515 and sandwiched between the step portion 518 and the sleeve 511 of the tube body 510, so as to limit the mounting base 531 by the step portion 518 and the tube body 510, preventing the mounting base 531 from moving arbitrarily. The mounting base 531 is provided with a connecting hole 532, which passes through the opposite ends of the mounting base 531 and communicates with the tube cavity, so that when the mounting base 531 is assembled, the receiving portion 512 of the tube body 510 and the communicating hole 516 of the end cap 515 are connected through the connecting hole 532. The plastic spring 534 elastically abuts against one end of the valve core 52 located inside the cavity, thereby placing the air port 523 outside the cavity. When the valve core 52 is subjected to force and slides along the cavity, it can compress the plastic spring 534, so that the air port 523 is located inside the cavity.

[0042] In this embodiment, one end of the plastic spring 534 is connected to the end of the mounting base 531 facing the valve core 52, and the other end of the plastic spring 534 is spaced apart from the mounting base 531. In this embodiment, the plastic spring 534 includes an arc-shaped connecting portion 535 and an elastic arm 536. The elastic arm 536 is connected to the mounting base 531 through the arc-shaped connecting portion 535. The side of the elastic arm 536 facing away from the mounting base 531 elastically abuts against the end of the valve core 52 located in the cavity, and the free end of the elastic arm 536 is spaced apart from the mounting base 531.

[0043] In the initial state, under the elastic force of the plastic spring 534, the air port 523 of the valve core 52 is located outside the lumen. At this time, the gas flow channel 520 is disconnected from the lumen and the airbag inflation valve. When it is necessary to inflate the airbag 20, the syringe draws air and inserts its needle end into the insertion port 521 after passing through the receiving cavity 5190 of the protective sleeve 519. The syringe is pushed towards the airbag pressure response sleeve 40, causing the valve core 52 to move towards the airbag pressure response sleeve 40 until the limiting flange 524 abuts against the end plate 513. At this time, the air port 523 is located inside the valve tube 51, so that the gas flow channel 520 is connected to the airbag pressure response sleeve 40 through the lumen, and the plastic spring 534 is compressed and undergoes elastic deformation. Subsequently, by pushing the piston of the syringe, the gas in the syringe enters the airbag 20 through the gas flow channel 520, the lumen, the airbag pressure response sleeve 40, and the inflation tube 30. After inflation, the syringe is withdrawn from the valve core 52. The elastic restoring force of the plastic spring 534 keeps the air port 523 outside the lumen, thus preventing gas from escaping from inside the airbag 20. At this time, the end of the valve core 52 with the insertion port 521 is housed in the protective sleeve 519, preventing accidental pressure on the valve core 52 from opening the airbag inflation valve 50. When it is necessary to deflate the airbag 20, the valve core 52 is pushed with an empty syringe so that the air port 523 is inside the valve tube 51. At this time, the airbag inflation valve 50 is open, and gas in the airbag 20 can escape from the airbag inflation valve 50.

[0044] Please see also Figures 6 to 7The second embodiment of this utility model provides a tracheal tube, the structure of which is roughly the same as that of the tracheal tube in the first embodiment, except for the structure of the elastic element 53. In this embodiment, the elastic element 53 includes a mounting base 531 and a plastic spring piece 534 fixedly connected to the mounting base 531 at one end. The mounting base 531 is made of a non-metallic material, such as rigid plastic, and is installed inside the tube cavity. The mounting base 531 is provided with a connecting hole 532, which passes through the opposite ends of the mounting base 531 and communicates with the tube cavity, so that when the mounting base 531 is assembled, the receiving part 512 of the tube body 510 and the communicating hole 516 of the end cap 515 are connected through the connecting hole 532. The plastic spring piece 534 elastically abuts against the end of the valve core 52 located inside the tube cavity, thereby placing the air port 523 outside the tube cavity. In this embodiment, there are two plastic spring pieces 534. Each plastic spring piece 534 includes an arc-shaped connecting portion 535 and an elastic arm 536. The elastic arm 536 is connected to the mounting base 531 through the arc-shaped connecting portion 535. The free end of the elastic arm 536 is spaced apart from the mounting base 531. In this embodiment, the arc-shaped connecting portions 535 of the two plastic spring pieces 534 are arranged opposite to each other, and the elastic arms 536 of the two plastic spring pieces 534 extend in opposite directions and are stacked and spaced apart along the axial direction of the valve tube 51. The side of the elastic arm 536 furthest from the mounting base 531 that faces away from the mounting base 531 elastically abuts against the end of the valve core 52 located in the tube cavity.

[0045] The aforementioned airbag inflation valve uses a plastic spring 534 instead of a metal spring to drive the valve core 52 to reset, so that the entire airbag inflation valve 50 does not contain any metal materials. This avoids the formation of shadows on the MRI image and eliminates the need to separate the airbag inflation valve from the airbag 20 during the examination, thus simplifying the operation process. It also retains the function of the airbag pressure response sleeve 40, which allows doctors to judge the status of the airbag 20 through the airbag pressure response sleeve 40, reducing the risk of endotracheal tube dislodgement and patient infection.

[0046] In the aforementioned airbag inflation valve, one end of the plastic spring 534 is connected to the mounting base 531, and the other end is spaced apart from the mounting base 531, thereby forming a space for the plastic spring 534 to deform, reducing the probability of the plastic spring 534 being damaged due to pressure deformation, and extending the service life of the plastic spring 534.

[0047] The aforementioned airbag inflation valve includes two plastic springs 534. The elastic arms 536 of the two plastic springs 534 extend in opposite directions and are stacked and spaced along the axial direction of the valve tube 51. This can improve the support force of the plastic springs 534 on the valve core 52 and make the valve core 52 more balanced and uniform in force.

[0048] The aforementioned airbag inflation valve, valve tube 51 includes tube body 510 and end cap 515 connected to one end of tube body 510. Through the threaded connection between end cap 515 and tube body 510, the mounting seat 531 of plastic spring piece 534 can be clamped between the stepped portion 518 of end cap 515 and tube body 510, thereby realizing the quick installation of plastic spring piece 534.

[0049] The above description is a detailed description of the preferred embodiments of the present utility model. However, the embodiments are not intended to limit the scope of the patent application of the present utility model. All equivalent changes or modifications made under the technical spirit of the present utility model should fall within the patent scope covered by the present utility model.

Claims

1. An inflation valve for a cuff of a tracheal tube, characterised in that: The valve tube, the valve core and the elastic member, the valve tube is equipped with a tube cavity, the tube cavity penetrates the opposite ends of the valve tube, the valve core is slidably arranged in the valve tube, the valve core is equipped with a gas flow channel, one end of the gas flow channel penetrates the end of the valve core outside the tube cavity to form a socket for a syringe, the other end of the gas flow channel penetrates the peripheral wall of the valve core to form a gas port; the elastic member includes a mounting seat and a plastic spring piece fixedly connected with one end of the mounting seat, the mounting seat is arranged in the tube cavity, and the plastic spring piece elastically abuts against one end of the valve core in the tube cavity, so that the gas port is located outside the tube cavity, and the valve core can slide along the tube cavity and extrude the plastic spring piece under stress, so that the gas port is located in the tube cavity.

2. An inflatable cuff valve for a tracheal tube as defined in claim 1, wherein: One end of the plastic spring piece is connected to the end of the mounting seat facing the valve core, and the other end of the plastic spring piece is spaced apart from the mounting seat.

3. An inflatable cuff valve for a tracheal tube as defined in claim 2, wherein: The plastic spring piece includes an arc-shaped connecting portion and an elastic arm, the elastic arm is connected to the mounting seat through the arc-shaped connecting portion, the elastic arm elastically abuts against one end of the valve core in the tube cavity, and the free end of the elastic arm is spaced apart from the mounting seat.

4. An inflatable cuff valve for a tracheal tube as defined in claim 3, wherein: The number of the plastic spring pieces is two, the arc-shaped connecting portions of the two plastic spring pieces are oppositely arranged, the elastic arms of the two plastic spring pieces extend in opposite directions and are arranged in a stacked and spaced manner along the axial direction of the valve tube.

5. The cuff inflation valve for a tracheal tube of claim 1, wherein: The valve tube includes a tube body and an end cover connected to one end of the tube body, the tube cavity penetrates the tube body and the end cover along the axial direction of the valve tube, and the mounting seat is clamped between the tube body and the end cover.

6. An inflatable cuff valve for a tracheal tube as defined in claim 5, wherein: The end cover and the end of the tube body away from the socket are detachably connected through threads.

7. An inflatable cuff valve for a tracheal tube as defined in claim 6 wherein: The end cover is equipped with a communication hole and a mounting hole arranged along the axial direction of the valve tube and communicating with each other, the hole diameter of the mounting hole is larger than that of the communication hole to form a stepped portion at the connection between the mounting hole and the communication hole, the tube body is inserted into the mounting hole and is threadedly connected with the mounting hole, and the mounting seat is placed in the mounting hole and clamped between the stepped portion and the tube body.

8. An inflatable cuff valve for a tracheal tube as defined in claim 7, wherein: The mounting seat is provided with a connecting hole, the tube body includes a sleeve and an end plate fixed to one end of the sleeve, the sleeve is equipped with a receiving portion, the receiving portion communicates with the communication hole through the connecting hole, the end cover is provided with a sliding hole, and the sliding hole, the receiving portion, the mounting hole and the communication hole constitute the tube cavity, and the valve core is slidably arranged in the sliding hole.

9. The cuff inflation valve for a tracheal tube according to claim 8, wherein: The valve tube further includes a protective sleeve, the protective sleeve is fixed to the end of the end plate away from the sleeve, the protective sleeve is equipped with a containing cavity, and one end of the valve core outside the tube cavity is contained in the containing cavity.

10. An endotracheal tube characterized by: The air bag inflation valve comprises the tracheal catheter according to any one of claims 1-9.

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