Tracheal catheter capable of monitoring pressure in cuff in real time

Abstract

The utility model discloses a tracheal catheter for monitoring pressure in a cuff in real time, which comprises a tracheal catheter main body tube, an inflation cuff and an inflation tube, an insertion end for being inserted into a trachea of a human body is formed at the front end of the main body tube, and a connecting end for being connected with a breathing machine is formed at the rear end of the main body tube; the inflatable cuff is hermetically sleeved outside the insertion end; the first end of the inflation tube is communicated with the inflation cuff; the pressure measuring mechanism comprises a pressure measuring assembly used for measuring pressure and an inflation and deflation assembly used for inflation and deflation. The pressure measuring assembly and the inflation and deflation assembly are sequentially connected to the inflation tube communicated with the inflation cuff in series, and real-time monitoring of the pressure in the inflation cuff and inflation and deflation adjustment of the pressure are effectively achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an endotracheal tube capable of real-time detecting the pressure inside an inflatable cuff. Background Art

[0002] Endotracheal intubation refers to inserting a special endotracheal tube into the trachea of a patient through the mouth or nose, which is a commonly used technique for controlling the airway and maintaining ventilation in clinical anesthesia and rescue work. During general anesthesia, it is mainly used for patients with difficult airway maintenance, such as intracranial surgery, thoracotomy, general anesthesia surgery in special positions such as prone or sitting positions, as well as patients with jaws, extreme obesity, obvious respiratory depression caused by general anesthetics or the use of muscle relaxants, and general anesthesia major surgeries on the face, neck, five sense organs, etc. In the above situations, endotracheal intubation is required. At the same time, endotracheal tubes play an important role in the rescue of critically ill patients. For example, endotracheal intubation technology must be used during respiratory failure, cardiopulmonary resuscitation, drug poisoning, and severe neonatal asphyxia.

[0003] Chinese Utility Model Patent Authorization Publication No. CN201658729U discloses a typical endotracheal tube. The endotracheal tube includes a main body tube, and an inflatable cuff is arranged at a certain distance (usually 1.5 cm) from the front end of the main body tube. The end of the main body tube is used to be connected and communicated with a ventilator; a thin inflation tube is communicated with the inflatable cuff, and the inflation tube is used for inflating and deflating the inflatable cuff; the function of the inflatable cuff is to prevent lateral air leakage during positive pressure ventilation after inflation, and at the same time, it can also prevent oral secretions or vomitus from being aspirated into the trachea by mistake to form aspiration. Once the pressure of the inflatable cuff is less than 8 cmH2O, the aspiration phenomenon cannot be prevented. When the pressure is greater than 30 cmH2O for a period of time, tracheal mucosal tissue ischemia will be caused due to compression. The mean arterial pressure of the capillary blood vessels of the tracheal cartilage ring and mucosa is 32 cmH2O. According to the recommendation of the Critical Care Medicine Branch of the Chinese Medical Association, when the pressure of the inflatable cuff is between 25 cmH2O and 30 cmH2O, the airway can be effectively sealed, and it is not higher than the tracheal mucosal capillary perfusion pressure, which can prevent complications such as airway mucosal ischemic injury, tracheoesophageal fistula, and tracheal stenosis after extubation. It can be seen that improper pressure of the inflatable cuff will increase the pressure of the endotracheal tube on the tracheal mucosa and may also fail to effectively seal the airway, resulting in the phenomenon of regurgitation and aspiration.

[0004] Therefore, there is an urgent need to provide an endotracheal tube that can monitor the pressure inside the inflatable cuff in real time to facilitate the adjustment of the pressure of the inflatable cuff. Content of the Utility Model

[0005] The purpose of the utility model is to provide an endotracheal tube for real-time monitoring of the pressure inside the cuff, which can monitor the pressure inside the inflatable cuff in real time to facilitate the adjustment of the pressure of the inflatable cuff.

[0006] To achieve the above object, the utility model provides a tracheal catheter for real-time monitoring of the pressure inside the cuff. The tracheal catheter for real-time monitoring of the pressure inside the cuff includes a main body tube, an inflatable cuff and an inflation tube. The front end of the main body tube forms an insertion end for inserting into the trachea of a human body, and the rear end of the main body tube forms a connection end for connecting to a ventilator; the inflatable cuff is hermetically sleeved outside the insertion end; the first end of the inflation tube is communicated with the inflatable cuff; wherein, a pressure measuring mechanism is further included, and the pressure measuring mechanism includes a pressure measuring component for measuring the pressure inside the cuff and a charging and discharging component for inflation and deflation; the pressure measuring component includes an outer shell body and an inner shell body both of which are in a transparent structure, and the inner shell body is suspended inside the outer shell body; a gas flow channel is formed in the gap between the outer shell body and the inner shell body; first openings and second openings are respectively formed at opposite ends of the outer shell body, and the first opening and the second opening are communicated through the gas flow channel, and the first opening is butted and communicated with the first end of the inflation tube; the inner shell body is in a hollow structure, and the hollow structure forms a sliding cavity. A pressure measuring port communicated with the sliding cavity is formed in the inner shell body opposite to the first opening. A pressure measuring spring and a sliding member are arranged in the sliding cavity. One end of the pressure measuring spring is fixed at the bottom of the sliding cavity, and the other end of the pressure measuring spring is fixedly connected with the sliding member. The sliding member is hermetically and slidably arranged in the sliding cavity. The cavity part from the sliding member to the pressure measuring port in the sliding cavity is communicated with the gas flow channel through the pressure measuring port; scale lines indicating pressure are arranged on the inner shell body from the pressure measuring port to the bottom; when the pressure measuring spring is in a natural state, the sliding member is opposite to the zero point of the scale line; the charging and discharging component includes a valve body, a positioning plate, a push rod, a sealing ring and a spring. The valve body is in a through hollow structure, and the hollow structure forms a valve cavity; the positioning plate is arranged in the valve cavity, and the positioning plate divides the valve cavity into a first cavity and a second cavity; the first cavity bulges outwards and continues to form a butting end that is hermetically butted and communicated with the second opening, and the second cavity bulges outwards and extends to form a connection end that is hermetically inserted and communicated with the nipple end of a syringe; the push rod slides through the positioning plate with a gap, and the push rod is arranged opposite to the butting end and the connection end. The sealing ring is fixedly sleeved at the middle section of the push rod and is located in the first cavity. The spring is sleeved on the push rod and is pressed between the sealing ring and the butting end. The spring is located in the first cavity. The first cavity is communicated with the gas flow channel through the butt joint and communication between the butting end and the second opening; the spring always has a tendency to press the sealing ring against the positioning plate, and when the sealing ring is pressed against the positioning plate, the first cavity and the second cavity are isolated from each other in terms of air flow; when the nipple end of the syringe is inserted into the connection end, the push rod will be pressed to move a certain distance towards the butting end.

[0007] Compared with the prior art, the utility model can inflate and deflate the inflatable cuff according to the actual situation, and can monitor the air pressure in the inflatable cuff in real time throughout the use process. Specifically, the principle of the utility model for real-time monitoring of the air pressure in the inflatable cuff is as follows: It is confirmed that the docking end is docked and communicated with the second opening, and the first opening is docked and communicated with the inflating tube. At this time, the inflatable cuff is communicated with the air flow channel through the inflating tube, and the air flow channel is communicated with the first cavity in the valve body through the communication between the second opening and the docking end; the sealing ring in the valve body is hermetically pressed against the positioning plate under the action of the spring, so that the first cavity is isolated from the second cavity, and further, the closed space formed by the interconnected inflatable cuff - inflating tube - air flow channel - first cavity is formed; this closed space is communicated with the side pressure port, and this closed space has air pressure because it has air; since the sliding member is hermetically slidably arranged in the sliding cavity, the closed space is isolated from the cavity where the pressure measuring spring is located in the sliding cavity, and further, the air pressure in the closed space will generate a force in the direction of compressing the pressure measuring spring on the sliding member (that is, generating a force in the direction of the bottom of the inner housing), and this force causes the sliding member to move a certain length in the direction of the bottom of the inner housing, and then reaches an equilibrium (this equilibrium is that the pressure of the air in the cavity where the pressure measuring spring is located on the sliding member + the elastic force of the pressure measuring spring on the sliding member = the pressure of the closed space on the sliding member). Read the scale line corresponding to the sliding member moving a certain length in the direction of the bottom of the inner housing as A cmH2O, that is, the pressure of the closed space at this time is A cmH2O. Since the closed space and the inflatable cuff belong to the same connected space and are isolated from the outside at this time, the pressure of the inflatable cuff is also A cmH2O; when the air pressure in the inflatable cuff changes, the sliding member will slide to the scale line corresponding to the corresponding pressure value; it is clear that when the air pressure in the inflatable cuff increases on the basis of A cmH2O, the sliding member will move in the direction of the bottom of the inner housing; when the air pressure in the inflatable cuff decreases on the basis of A cmH2O, the sliding member will move away from the bottom of the inner housing.Specifically, when inflation of the inflatable cuff is required, confirm that the docking end is in butt-joint communication with the second opening and the first opening is in butt-joint communication with the inflation tube; then pull the handle of the syringe to a certain distance so that the syringe barrel has a certain space for storing air, and then insert the nipple end of the syringe into the connection end in a sealed manner to complete the connection of the syringe; when the nipple end of the syringe is inserted into the connection end, it will press the push rod towards the docking end, so that the sealing ring and the fixing plate fixed on the push rod move towards the docking end synchronously. At the same time, the spring is compressed, so that the sealing pressure between the sealing ring and the positioning plate is released, so that the first chamber and the second chamber are in air flow communication through the gap between the positioning plate and the push rod, making the first chamber and the second chamber communicate. The first chamber is in communication with the air flow channel through the butt-joint communication between the docking end and the second opening, and the air flow channel is in communication with the inflatable cuff through the butt-joint communication between the first opening and the inflation tube. Therefore, the syringe barrel - the second chamber - the first chamber - the air flow channel - the inflation tube - the inflatable cuff are interconnected to form an inflation and deflation channel; push the handle of the syringe, and the air in the syringe will be injected into the inflation and deflation channel, and the air pressure in the inflation and deflation channel will increase; on the one hand, it makes the pressure of the inflatable cuff increase to achieve the purpose of inflating the inflatable cuff; on the other hand, it makes the value of the scale line corresponding to the sliding member increase, that is, the pressure value increases; when the pressure value of the scale line corresponding to the sliding member increases to the required pressure value, stop pushing the handle of the syringe to complete the required inflation of the inflatable cuff; after inflation, remove the syringe. The removal of the syringe will cancel the pressure on the push rod, so that the sealing ring and the fixing plate are re-sealed against the positioning plate under the elastic return of the spring, thereby preventing air leakage of the inflatable cuff.Specifically, when deflating the inflatable cuff, confirm that the docking end is in docking communication with the second opening and the first opening is in docking communication with the inflation tube; then push the handle of the syringe to the end so that there is no air in the syringe barrel, and then insert the nipple end of the syringe into the connection end in a sealed manner to complete the connection of the syringe; when the nipple end of the syringe is inserted into the connection end, it will press the push rod to move towards the docking end, so that the sealing ring and the fixing plate fixed on the push rod move synchronously towards the docking end. At the same time, the spring is compressed, so that the sealing pressure between the sealing ring and the positioning plate is released, so that the first chamber and the second chamber are in air flow communication through the gap between the positioning plate and the push rod, so that the first chamber and the second chamber are connected. The first chamber is connected to the air flow channel through the docking communication between the docking end and the second opening. The air flow channel is connected to the inflatable cuff through the docking communication between the first opening and the inflation tube. Therefore, the syringe barrel - the second chamber - the first chamber - the air flow channel - the inflation tube - the inflatable cuff are connected to form an inflation and deflation channel; pull the handle of the syringe, and the air in the inflation and deflation channel will be drawn into the syringe barrel, and the air pressure in the inflation and deflation channel will decrease; on the one hand, the pressure of the inflatable cuff is reduced to achieve the purpose of deflating the inflatable cuff; on the other hand, the value of the scale line corresponding to the sliding member is reduced, that is, the pressure value is reduced; when the pressure value of the scale line corresponding to the sliding member is reduced to the required pressure value, stop pulling the handle of the syringe to complete the required deflation of the inflatable cuff; after deflation, remove the syringe. The removal of the syringe will cancel the pressure on the push rod, so that the sealing ring is resealed against the positioning plate under the rebounding action of the spring, thereby preventing air leakage of the inflatable cuff. In summary, the present utility model effectively realizes the real-time monitoring of the pressure in the inflatable cuff and the adjustment of the inflation and deflation of the pressure by connecting the pressure measuring component and the inflation and deflation component in series on the inflation tube communicating with the inflatable cuff in sequence.

[0008] Preferably, the inflation and deflation component of the tracheal catheter for real-time monitoring of the pressure in the cuff of the present utility model further includes a guide sleeve, and the guide sleeve is slidably arranged in the second chamber, and the guide sleeve is sleeved and fixed outside the push rod.

[0009] Preferably, the cross section of the push rod of the tracheal catheter for real-time monitoring of the pressure in the cuff of the present utility model is of a polygonal structure.

[0010] Preferably, a support frame is arranged between the outer shell and the inner shell of the tracheal catheter for real-time monitoring of the pressure in the cuff of the present utility model in a staggered manner, and the inner shell is suspended in the outer shell by means of the support frame.

[0011] Preferably, the valve body of the tracheal catheter for real-time monitoring of the pressure in the cuff of the present utility model has a gripping member protruding outward.

[0012] Preferably, the valve body of the tracheal catheter for real-time monitoring of the pressure in the cuff of the present utility model has a tubular structure.

[0013] Preferably, the inner housing of the tracheal catheter for real-time monitoring of the pressure in the cuff of the present utility model has a tubular structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the tracheal catheter for real-time monitoring of pressure of the present utility model.

[0015] Figure 2 is a schematic structural diagram of the pressure measuring mechanism of the present utility model.

[0016] Figure 3 is a schematic structural diagram of the pressure measuring component in the pressure measuring mechanism of the present utility model.

[0017] Figure 4 is a schematic structural diagram of the inflation and deflation component in the pressure measuring mechanism of the present utility model.

[0018] Figure 5 is Figure 4 a schematic structural diagram of the separation of the sealing ring and the positioning plate in the inflation and deflation component in

[0019] Figure 6 is a schematic cross-sectional structural diagram of the connection between the push rod and the guide sleeve of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following combines specific implementation examples and the drawings to clearly and completely describe the technical solutions in the embodiments of the present application and to elaborate on the technical solutions of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application. The following elaborates on the specific implementation manners of the present utility model with reference to the drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below. Now, the embodiments of the present utility model are described with reference to the drawings, and like reference numerals in the drawings represent like elements.

[0021] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0022] As Figure 1 - Figure 5 shown, the tracheal catheter 100 for real-time monitoring of the pressure in the cuff of the present utility model includes a main body tube 1, an inflatable cuff 2 and an inflation tube 3. The front end of the main body tube 1 forms an insertion end 11 for inserting into the trachea of a human body, and the rear end of the main body tube 1 forms a connection end 12 for connecting to a ventilator; the inflatable cuff 2 is hermetically sleeved outside the insertion end 11; the first end 31 of the inflation tube 3 communicates with the inflatable cuff 2; wherein, it further includes a pressure measuring mechanism 4-5, and the pressure measuring mechanism 4-5 includes a pressure measuring component 4 for measuring pressure and a charging and discharging component 5 for charging and discharging gas; the pressure measuring component 4 includes an outer shell 41 and an inner shell 42 both of which are of a transparent structure, and the inner shell 42 is suspended inside the outer shell 41; the gap between the outer shell 41 and the inner shell 42 forms an air flow channel 43; the opposite ends of the outer shell 41 are respectively provided with a first opening 411 and a second opening 412, and the first opening 411 and the second opening 412 are communicated through the air flow channel 43, and the first opening 411 is butt-connected and communicated with the first end 31 of the inflation tube 3; the inner shell 42 has a hollow structure, and the hollow structure forms a sliding cavity 421. The inner shell 42 is provided with a pressure measuring port 422 communicating with the sliding cavity 421 opposite to the first opening 411. A pressure measuring spring 44 and a sliding member 45 are arranged in the sliding cavity 421. One end of the pressure measuring spring 44 is fixed to the bottom 421a of the sliding cavity 421, and the other end of the pressure measuring spring 44 is fixedly connected with the sliding member 45. The sliding member 45 is hermetically and slidably arranged in the sliding cavity 421. The cavity part from the sliding member 45 to the pressure measuring port 422 in the sliding cavity 421 is communicated with the air flow channel 43 through the pressure measuring port 422; a scale line 46 for marking pressure is provided on the inner shell 42 from the pressure measuring port 422 to the bottom 421a ( Figure 1The scale line shown is what is seen through the outer housing 41); in the natural state of the pressure measuring spring 44, the slider 45 is aligned with the zero point of the scale line 46; the charging and discharging assembly 5 includes a valve body 51, a positioning plate 52, a push rod 53, a sealing ring 54 and a spring 55. The valve body 51 has a through hollow structure, and the hollow structure forms a valve cavity 511. The positioning plate 52 of the present invention is arranged in the valve cavity 511, and the positioning plate 52 divides the valve cavity 511 into a first chamber 5a and a second chamber 5b; the first chamber 5a protrudes outward and continues to form a docking end 51a that is hermetically docked and communicated with the second opening 412, and the second chamber 5b protrudes outward and extends to form a connection end 51b that is hermetically inserted and communicated with the nipple end of the syringe. The push rod 53 of the present invention slides through the positioning plate 52 with a gap 57, and the push rod 53 is arranged facing the docking end 51a and the connection end 51b, that is, the extension lines at both ends of the push rod 53 respectively pass through the docking end 51a and the connection end 51b. At the same time, the docking end 51a and the connection end 51b must also be arranged facing each other. The sealing ring 54 of the present invention is fixedly sleeved on the middle section of the push rod 53 and is located in the first chamber 5a of the valve body 51. Specifically, the sealing ring 54 is preferably made of elastic rubber material, and its contour is preferably circular. The spring 55 of the present invention is sleeved on the push rod 53 and is pressed between the sealing ring 54 and the docking end 51a. The spring 54 is located in the first chamber 5a of the valve body 51. The first chamber 5a of the present invention is communicated with the air flow channel 43 of the pressure measuring assembly through the docking of the docking end 51a and the second opening 412. The spring 55 of the present invention always has a tendency to press the sealing ring 54 against the positioning plate 52, and the sealing ring 54 pressing against the positioning plate 52 isolates the air flow between the first chamber 51a and the second chamber 51b of the valve body 51. When the present invention is inflated and deflated, the nipple end of the syringe is inserted into the connection end 51b and will press against the end of the push rod 53 in the second chamber 51b of the valve body 51. The push rod 53 will move a certain distance towards the docking end 51b due to the continuous pressing during the insertion process of the nipple end of the syringe.

[0023] As Figure 1 - Figure 5As shown, the utility model can inflate and deflate the inflatable cuff 2 according to the actual situation, and can monitor the pressure (i.e., air pressure) of the inflatable cuff 2 in real time throughout the use process. Specifically, the principle of the utility model for real-time monitoring of the air pressure of the inflatable cuff 2 is as follows: It is confirmed that the docking end 51a of the valve body 51 of the inflation and deflation assembly 5 is docked and communicated with the second opening 412 of the outer housing 41 of the pressure measuring assembly 4, and the first opening 411 of the outer housing 41 is docked and communicated with the first end 31 of the inflation tube 3. At this time, the inflatable cuff 2 is communicated with the air flow channel 43 of the pressure measuring assembly 4 through the inflation tube 3, and the air flow channel 43 is communicated with the first cavity 51a in the valve body 51 through the communication between the second opening 412 of the outer housing 41 and the docking end 51a of the inflation and deflation assembly 5; the sealing ring 54 in the valve body 51 is hermetically pressed against the positioning plate 52 under the action of the spring 55, so that the first cavity 5a is isolated from the second cavity 5b, and further the interconnected inflatable cuff 2 - inflation tube 3 - air flow channel 43 - first cavity 5a forms a closed space, which is isolated from the second cavity 5b, so this closed space is isolated from the outside world; since the inner housing 42 is provided with a pressure measuring port 422, and this pressure measuring port 422 is communicated with the air flow channel 43, so that this closed space is communicated with the side pressure port 422. This closed space has air pressure because it has air; since the sliding member 45 in the pressure measuring assembly 4 is hermetically slidably arranged in the sliding cavity 421, the formed closed space is isolated from the cavity 421b where the pressure measuring spring 44 is located in the sliding cavity 421 (it should be noted that, Figure 2 illustrates the initial state of the pressure measuring assembly (that is, the state where there is no air in the inflatable cuff 2 and the reading of the pressure measuring assembly is zero pressure). In this state, since the pressure measuring spring 44 is compressed, the sliding member 45 is pressed against the pressure measuring port 422, so Figure 4In the state shown, the sliding chamber 421 is the above-mentioned chamber 421 b); furthermore, the air pressure in the closed space acting on the sliding member 45 will generate a force in the direction of compressing the pressure measuring spring 44 (i.e., generate a force towards the bottom 421a of the inner housing 42), and this force causes the sliding member 45 to move a certain length towards the bottom 421a of its inner housing 42, and then reach an equilibrium (this equilibrium means that the pressure of the air in the chamber where the pressure measuring spring 44 is located acting on the sliding member 45 + the elastic force of the pressure measuring spring 44 acting on the sliding member 45 = the pressure of the air in the closed space acting on the sliding member 45). Read the scale line corresponding to the sliding member 45 moving a certain length towards the bottom 421a of the inner housing 42 as A cmH2O, that is, the pressure in the closed space at this time is A cmH2O. Since the closed space and the inflatable cuff 2 belong to the same connected space and are isolated from the outside at this time, the pressure of the inflatable cuff 2 is also A cmH2O at this time; when the air pressure in the inflatable cuff 2 changes, the sliding member 45 will slide to the scale line 46 corresponding to the corresponding pressure value; it can be clearly seen that when the air pressure in the inflatable cuff 2 increases on the basis of A cmH2O, the sliding member 45 will move towards the bottom 421a of the inner housing 42; when the air pressure in the inflatable cuff 2 decreases on the basis of A cmH2O, the sliding member 45 will move away from the bottom 421a of the inner housing 42. Specifically, when it is necessary to inflate the inflatable cuff 2, confirm that the docking end 51a of the valve body 51 of the charging and discharging assembly 5 is docked and communicated with the second opening 412 of the outer housing 41 of the pressure measuring assembly 4 and the first opening 411 of the outer housing 41 is docked and communicated with the first end 31 of the inflatable tube 3; then pull the handle of the syringe to a certain distance so that the syringe barrel has a certain space for storing air, and then hermetically insert the nipple end of the syringe into the connecting end 51b of the valve body 51 of the charging and discharging assembly 5 to complete the connection of the syringe; inserting the nipple end of the syringe into the connecting end 51b of the valve body 51 will press against the end of the push rod 53 in the valve body 51, and the push rod 53 will move towards the docking end 51a due to the insertion and pressing of the nipple end of the syringe, so that the sealing ring 54 fixed on the push rod 53 will move towards the docking end 51a synchronously. At the same time, the spring 55 will be compressed, and then the sealed pressing between the sealing ring 54 and the positioning plate 52 will be released ( Figure 4 In the state, the sealing ring 54 and the positioning plate 52 are in sealed pressing, and it changes to Figure 5(when the middle sealing ring 54 is separated from the positioning plate 52), so that the first chamber 5a and the second chamber 5b of the valve body 51 are in air flow communication through the gap 57 between the positioning plate 52 and the push rod 53, enabling the first chamber 5a and the second chamber 5b of the valve body 51 to communicate. The first chamber 5a of the valve body 51 of the charging and discharging assembly 5 is further in communication with the air flow channel 43 through the docking connection between the docking end 51a and the second opening 412 of the outer housing 41 of the pressure measuring assembly 4. The air flow channel 43 is in communication with the inflatable cuff 2 through the docking connection between the first opening 411 and the charging tube 3. Therefore, the syringe barrel - the second chamber 5b - the first chamber 5a - the air flow channel 43 - the charging tube 3 - the inflatable cuff 2 are in communication with each other to form a charging and discharging channel; by pushing the handle of the syringe, the air in the syringe will be injected into the charging and discharging channel, and the air pressure in the charging and discharging channel will increase; on the one hand, it causes the pressure of the inflatable cuff 2 to increase, achieving the purpose of inflating the inflatable cuff 2; on the other hand, it causes the value of the scale line 46 corresponding to the sliding member 45 of the pressure measuring assembly 4 to increase, that is, the pressure value increases; when the pressure value corresponding to the scale line 46 of the sliding member 45 increases to the required pressure value, stop pushing the handle of the syringe to complete the required inflation of the inflatable cuff 2; after inflation, remove the syringe. The removal of the syringe will cancel the pressing on the push rod 53, and then the sealing ring 54 will be resiliently pressed against the positioning plate 52 again under the action of the spring 55, thereby preventing air leakage from the inflatable cuff 2. Specifically, when it is necessary to deflate the inflatable cuff 2, confirm that the docking end 51a of the valve body 51 of the charging and discharging assembly 5 is in docking communication with the second opening 412 of the outer housing 41 of the pressure measuring assembly 4 and the first opening 411 of the outer housing 41 is in docking communication with the first end 31 of the charging tube 3; then push the handle of the syringe to the end so that there is no air in the syringe barrel, and then insert the nipple end of the syringe into the connection end 51b of the valve body 51 of the charging and discharging assembly 5 in a sealed manner to complete the connection of the syringe; the insertion of the nipple end of the syringe into the connection end 51b of the valve body 51 will press the end of the push rod 53 in the valve body 51, and the push rod 53 will move in the direction of the docking end 51a under the insertion pressure of the nipple end of the syringe, so that the sealing ring 54 fixed on the push rod 53 will move in the direction of the docking end 51a synchronously. At the same time, the spring 55 will be compressed, and then the sealed pressing between the sealing ring 54 and the positioning plate 52 will be released ( Figure 4 in the state where the sealing ring 54 is in sealed pressing against the positioning plate 52, it is transformed into Figure 5State where the middle sealing ring 54 is separated from the positioning plate 52), so that the first chamber 5a and the second chamber 5b of the valve body 51 are in air flow communication through the gap 57 between the positioning plate 52 and the push rod 53, enabling the first chamber 5a and the second chamber 5b of the valve body 51 to communicate. The first chamber 5a of the valve body 51 of the charging and discharging assembly 5 is further in communication with the air flow channel 43 through the docking connection between the docking end 51a and the second opening 412 of the outer housing 41 of the pressure measuring assembly 4. The air flow channel 43 is in communication with the inflatable cuff 2 through the docking connection with the inflatable tube 3 at the first opening 411. Therefore, the syringe barrel - the second chamber 5b - the first chamber 5a - the air flow channel 43 - the inflatable tube 3 - the inflatable cuff 2 are interconnected to form an inflation and deflation channel. When the handle of the syringe is pulled, the air in the inflation and deflation channel will be drawn into the syringe barrel, and the air pressure in the inflation and deflation channel will decrease. On the one hand, it causes the pressure of the inflatable cuff 2 to decrease, achieving the purpose of deflating the inflatable cuff 2. On the other hand, it causes the value of the scale line 46 corresponding to the sliding member 45 of the pressure measuring assembly 4 to decrease, that is, the pressure value decreases. When the pressure value of the scale line 46 corresponding to the sliding member 45 decreases to the required pressure value, stop pulling the handle of the syringe to complete the required deflation of the inflatable cuff 2. After the deflation is completed, the syringe is removed. The removal of the syringe will cancel the pressing on the push rod 53, and then the sealing ring 54 will be resiliently pressed against the positioning plate 52 again under the action of the spring 55, thereby preventing air leakage from the inflatable cuff 2. In summary, the present utility model effectively realizes the real-time monitoring of the pressure of the inflatable cuff 2 and the adjustment of the inflation and deflation of the pressure by sequentially connecting the pressure measuring assembly 4 and the charging and discharging assembly 5 in series on the inflatable tube 3 communicating with the inflatable cuff 2. It should be noted that the above inflation includes at least the following two situations: First, inflating when there is no air in the inflatable cuff 2. Second, when there is already a certain amount of air in the inflatable cuff 2, according to actual needs, additional pressure needs to be added to the inflatable cuff 2 to make its pressure reach the required value after inflation. It should be noted that the above deflation includes at least the following two situations: First, completely discharging the air in the inflatable cuff 2 regularly. Second, deflating the inflatable cuff 2 according to actual needs to reduce the pressure, so that its pressure reaches the required value after deflation.

[0024] Such as Figure 4 and Figure 5As shown, preferably, the charging and discharging assembly 5 of the present utility model further includes a guide sleeve 56 which is slidably disposed in the second chamber 5b of the valve body 51, that is, the guide sleeve 56 can slide along the inner wall of the second chamber 5b. However, there is a gap for air flow between the guide sleeve 56 and the inner wall of the second chamber 5b, that is, the air flow in the left region of the guide sleeve 56 can smoothly reach the right region of the guide sleeve through this gap, or the air flow in the right region of the guide sleeve 56 can smoothly reach the left region of the guide sleeve through this gap. The guide sleeve 56 is sleeved and fixed outside the push rod 53. The movement of the push rod 53 drives the guide sleeve 56 to move synchronously. Since the guide sleeve 56 is slidably disposed in the second chamber 5b, the guide sleeve 56 effectively guides the movement of the push rod 53, ensuring that the sealing ring 54 and the positioning plate 52 can be completely separated when needed, and also ensuring that the sealing ring 54 and the positioning plate 52 can be tightly sealed and pressed against each other when needed. More specifically, in order to further improve the clearance 57 fit between the push rod 53 and the positioning plate 52, so that after the sealing ring 54 and the positioning plate 52 are separated, the first chamber 5a and the second chamber 5b can be smoothly communicated; the cross section of the push rod 53 of the present utility model is in a polygonal structure. Further, as Figure 6 shown, the cross section of the push rod 53 of the present utility model is in a triangular structure.

[0025] As Figure 2 and Figure 3 shown, preferably, a support frame 47 is disposed between the outer housing 41 and the inner housing 42 of the present utility model in a misaligned manner, and the inner housing 42 is suspended in the outer housing 41 by means of the support frame 47. Through the misaligned setting of the support frame 47, on the one hand, the inner housing 42 can be stably suspended in the outer housing 41, and on the other hand, a gap is formed between the support frames 47 due to the misalignment, so that the air flow channel 43 will not be blocked due to the setting of the support frame 47, ensuring that the air flow channel 43 surrounds the entire inner housing 42.

[0026] As Figure 2 - Figure 5 shown, preferably, the valve body 51 of the charging and discharging assembly 5 of the present utility model has a protruding gripping member 58 on the outside. By gripping the protruding gripping member 58, it is convenient to operate the installation, disassembly and maintenance of the charging and discharging assembly 5.

[0027] As Figure 4 and Figure 5 shown, preferably, the valve body 51 for real-time pressure monitoring of the present utility model is in a tubular structure. The tubular valve body 51 is convenient for manufacturing and use.

[0028] As Figure 2 and Figure 3 shown, preferably, the inner housing 42 for real-time pressure monitoring of the present utility model is in a tubular structure. The tubular inner housing is convenient for manufacturing and arranging the components therein.

[0029] In addition, the structures and working principles of the syringe and the main tube 1 involved in the present utility model are well-known to those of ordinary skill in the art, and thus will not be described in detail herein.

[0030] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved. At the same time, the above-disclosed are only the preferred embodiments of the present utility model, and of course cannot be used to limit the scope of rights of the present utility model. Therefore, equivalent changes made in accordance with the scope of the patent application of the present utility model still fall within the scope covered by the present utility model.

Claims

1. An endotracheal tube for real-time monitoring of the pressure inside the cuff, comprising a main body tube, an inflatable cuff and an inflation tube. The front end of the main body tube forms an insertion end for inserting into the trachea of a human body, and the rear end of the main body tube forms a connection end for connecting to a ventilator; the inflatable cuff is hermetically sleeved outside the insertion end; the first end of the inflation tube is communicated with the inflatable cuff; and it is characterized in that, It further includes a pressure measuring mechanism, and the pressure measuring mechanism includes: A pressure measuring component for measuring pressure. The pressure measuring component includes an outer shell body and an inner shell body both of which are transparent structures, and the inner shell body is suspended in the outer shell body; a gap between the outer shell body and the inner shell body forms an air flow channel; first openings and second openings are respectively formed at opposite ends of the outer shell body, and the first opening and the second opening are communicated through the air flow channel, and the first opening is butt-connected and communicated with the first end of the charging pipe; the inner shell body has a hollow structure, and the hollow structure forms a sliding cavity. The inner shell body is provided with a pressure measuring port communicated with the sliding cavity opposite to the first opening. A pressure measuring spring and a sliding member are arranged in the sliding cavity. One end of the pressure measuring spring is fixed to the bottom of the sliding cavity, and the other end of the pressure measuring spring is fixedly connected with the sliding member. The sliding member is slidably arranged in the sliding cavity in a sealed manner. A cavity part from the sliding member to the pressure measuring port in the sliding cavity is communicated with the air flow channel through the pressure measuring port; scale lines indicating pressure are arranged on the inner shell body from the pressure measuring port to the bottom; in the natural state of the pressure measuring spring, the sliding member faces the zero point of the scale line; and A charging and discharging component for charging and discharging gas. The charging and discharging component includes a valve body, a positioning plate, a push rod, a sealing ring and a spring. The valve body has a through hollow structure, and the hollow structure forms a valve cavity; the positioning plate is arranged in the valve cavity, and the positioning plate divides the valve cavity into a first cavity and a second cavity; the first cavity bulges outwards and continues to form a butt joint end that is hermetically butt-connected and communicated with the second opening, and the second cavity bulges outwards and extends to form a connection end that is hermetically inserted and communicated with the nipple end of the syringe; the push rod slidably passes through the positioning plate with a gap, and the push rod is arranged opposite to the butt joint end and the connection end. The sealing ring is fixedly sleeved at the middle section of the push rod and is located in the first cavity. The spring is sleeved on the push rod and is pressed between the sealing ring and the butt joint end. The spring is located in the first cavity. The first cavity is communicated with the air flow channel through the butt joint connection between the butt joint end and the second opening; the spring always has a tendency to press the sealing ring against the positioning plate, and when the sealing ring is pressed against the positioning plate, the air flow between the first cavity and the second cavity is isolated; when the nipple end of the syringe is inserted into the connection end, the push rod will be pressed to move a certain distance towards the butt joint end.

2. The endotracheal tube for real-time monitoring of the pressure inside the cuff according to claim 1, wherein The charging and discharging component further includes a guide sleeve, and the guide sleeve is slidably arranged in the second cavity and is sleeved and fixed on the outer side of the push rod.

3. The endotracheal tube for real-time monitoring of the pressure inside the cuff according to claim 1, characterized in that, The cross section of the push rod is in a polygonal structure.

4. The endotracheal tube for real-time monitoring of the pressure inside the cuff according to claim 1, wherein A support frame is arranged between the outer shell body and the inner shell body in a staggered manner, and the inner shell body is suspended in the outer shell body by the support frame.

5. The endotracheal tube for real-time monitoring of the pressure inside the cuff according to claim 1, characterized in that, An outwardly protruding holding member is arranged outside the valve body.

6. The endotracheal tube for real-time monitoring of the pressure inside the cuff according to claim 1, characterized in that, The valve body is in a tubular structure.

7. The endotracheal tube for real-time monitoring of the pressure inside the cuff according to claim 1, wherein The inner shell body is in a tubular structure.

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