A sphygmomanometer

Abstract

This application relates to the technical field of medical devices, and particularly to a sphygmomanometer. Among them, the valve unit includes a bracket, a spool, a moving iron core, and an exhaust duct. The spool is fixedly connected to the bracket, the moving iron core is slidably connected within the spool. The exhaust duct has an exhaust inlet section and an exhaust outlet section. The axial direction of the exhaust inlet section is the same as the radial direction of the moving iron core. The exhaust inlet section communicates with the exhaust outlet section to form an exhaust passage. The moving iron core can move between a first position blocking the exhaust passage and a second position opening the exhaust passage. The exhaust inlet section communicates with the inner cavity of the airbag through a nozzle in a direction perpendicular to the surface of the cuff. This application reduces the assembly process of the main unit, realizes the modularization of the valve unit, saves the space of the main unit, facilitates the miniaturization of the main unit, improves the air release efficiency of the inner cavity of the airbag, and effectively solves the problems existing in the prior art.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly to a sphygmomanometer. Background Art

[0002] Blood pressure refers to the lateral pressure exerted on the unit area of the blood vessel wall when the blood flows in the blood vessel. When the cuff in the electronic sphygmomanometer surrounds the measurement site to measure the blood pressure, the pressure sensor in the main body of the electronic sphygmomanometer measures the pressure in the airbag lumen of the cuff, so as to obtain the blood pressure of the measured site. However, in the use of the electronic sphygmomanometer, when the air charging and discharging unit and the pressure sensing unit in the main body are connected to the airbag lumen, it is usually necessary to connect them through an external air guide hose, which brings trouble to the assembly of the electronic sphygmomanometer and also limits the possibility of miniaturization of the electronic sphygmomanometer. A larger size of the electronic sphygmomanometer is not conducive to carrying around. In addition, there is a situation where the air release device and the air inflation device share the air guide hose, which will inevitably cause mutual influence and reduce the measurement accuracy. Therefore, how to solve the above deficiencies on the basis of the existing technology is a problem that those skilled in the art need to solve. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a sphygmomanometer, in which a valve unit is internally provided with an exhaust passage. The exhaust passage has an exhaust inlet section arranged along the radial direction of the moving iron core. When the surface of the airbag is parallel to the axial direction of the moving iron core, the exhaust inlet section can be directly inserted into the air nozzle on the surface of the airbag, without the need for an external air guide hose for the valve unit, reducing the assembly process of the main body, realizing the modularization of the valve unit, saving the space of the main body, and facilitating the miniaturization of the main body; the valve unit is directly inserted into the airbag, eliminating the gas path in the original air guide hose, improving the air release efficiency of the airbag lumen, and effectively solving the problems existing in the prior art.

[0004] To solve the above problems, the present invention provides a sphygmomanometer, including a cuff. The cuff includes an outer cover and an inflatable and deflatable airbag placed inside the outer cover. The airbag is provided with an air nozzle communicating with the airbag lumen; it also includes a main body fixed to the cuff. The main body includes a pump unit for inflating the airbag, a valve unit for exhausting the airbag, and a pressure sensing unit for sensing the pressure inside the airbag lumen; wherein, the valve unit includes a bracket, a spool, a moving iron core, and an exhaust duct. The spool is fixedly connected to the bracket. The moving iron core is slidably connected inside the spool. The exhaust duct has an exhaust inlet section and an exhaust outlet section. The axial direction of the exhaust inlet section is the same as the radial direction of the moving iron core. The exhaust inlet section communicates with the exhaust outlet section to form an exhaust passage. The moving iron core can move between a first position blocking the exhaust passage and a second position opening the exhaust passage. The exhaust inlet section communicates with the airbag lumen through the air nozzle along the direction perpendicular to the surface of the cuff.

[0005] In an embodiment of the present application, a blocking hole communicating with the exhaust passage is formed in the wall of the exhaust duct. When the moving iron core extends into the exhaust passage through the blocking hole and blocks the exhaust passage, the moving iron core is located at the first position. By extending into the exhaust passage to block the gas passage, the blocking effect is better, and the direction of the exhaust outlet section and the position of the air outlet are not restricted, so that the valve unit can adapt to different application scenarios.

[0006] Furthermore, the exhaust outlet section is arranged along the moving direction of the moving iron core, and the exhaust outlet section extends away from the moving iron core and extends out of the bracket. The moving iron core can extend into the exhaust outlet section through the blocking hole to block the exhaust passage within the exhaust outlet section. The gas in the inner cavity of the airbag is directly discharged outside the valve unit, which will not have an impact on the internal components of the valve unit, and can appropriately make the overall valve unit thinner.

[0007] Furthermore, the edge of the blocking hole extends towards the moving iron core to form a guiding section, and a "T"-shaped exhaust passage is formed within the guiding section, the exhaust inlet section and the exhaust outlet section. The blocking effect is better, and it can prevent the gas from entering the valve unit through the exhaust passage and impacting the components.

[0008] Furthermore, the moving iron core is slidably connected within the guiding section, and the moving distance of the moving iron core between the first position and the second position is less than or equal to the length of the moving iron core extending into the exhaust passage. This can prevent the moving iron core from being misaligned when moving between the first position and the second position, resulting in the valve unit being unusable.

[0009] In an embodiment of the present application, when the moving iron core is located at the first position, the side wall of the moving iron core fits against the inner wall of the exhaust outlet section to block the gas in the exhaust inlet section from entering the exhaust outlet section. It realizes two-way blocking, making the effect of blocking exhaust and preventing the airbag from deflating better.

[0010] In an embodiment of the present application, the axial direction of the exhaust outlet section is perpendicular to the axis direction of the spool, and a blocking hole is formed at the intersection of the exhaust outlet section and the exhaust inlet section. It can appropriately reduce the length of the valve unit in the axial direction of the moving iron core and is applicable to different application scenarios.

[0011] In an embodiment of the present application, the exhaust inlet section and the exhaust outlet section are integrally formed. It is convenient for production, reduces the assembly process, and improves production and working efficiency.

[0012] In an embodiment of the present application, the exhaust outlet section is arranged along the moving direction of the moving iron core, and the exhaust outlet section extends towards the moving iron core. When the moving iron core abuts against the outer end face of the exhaust outlet section in the axial direction of the moving iron core, the moving iron core is located at the first position. The structure is simple and directly blocks the air outlet.

[0013] In an embodiment of the present application, when the sphygmomanometer is in a worn state, the main unit has a proximal end and a distal end, and the pressure sensing unit, the valve unit, and the pump unit are arranged in sequence from the distal end to the proximal end. This can avoid the vibration caused by the inflation of the pump unit from affecting the measurement of the pressure sensor, which is conducive to ensuring accurate measurement when the pressure bed is picked up.

[0014] The beneficial effect of the present invention is that the present invention provides a sphygmomanometer, in which the valve unit is internally provided with an exhaust passage. This exhaust passage has an exhaust inlet section along the radial direction of the moving iron core. When the surface of the airbag is parallel to the axial direction of the moving iron core, the exhaust inlet section can directly insert into the air nozzle on the surface of the airbag, eliminating the need for the valve unit to be externally connected with a gas guiding hose. This reduces the installation process of the main unit, realizes the integration of the valve unit, saves the space of the main unit, and is conducive to the miniaturization of the main unit; the valve unit directly inserts into the airbag, eliminating the gas path in the original gas guiding hose, and improving the deflation efficiency of the inner cavity of the airbag; effectively solving the problems existing in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0016] Figure 1 is a cross-section of an embodiment of the sphygmomanometer provided by the present application Figure 1 .

[0017] Figure 2 is a cross-section of an embodiment of the sphygmomanometer provided by the present application Figure 2 .

[0018] Figure 3 is a cross-section of an embodiment of the sphygmomanometer provided by the present application Figure 3 .

[0019] Figure 4 is a cross-section of an embodiment of the sphygmomanometer provided by the present application Figure 4 .

[0020] Figure 5 is a cross-section of an embodiment of the sphygmomanometer provided by the present application Figure 5 .

[0021] Figure 6 is a cross-section of an embodiment of the sphygmomanometer provided by the present application Figure 6 .

[0022] Figure 7 is a state diagram of the sphygmomanometer provided by the present application when worn.

[0023] Among them, a valve unit 1, a bracket 2, a spool 3, a moving iron core 4, an exhaust duct 5, an exhaust inlet section 51, an exhaust outlet section 52, a plugging hole 53, a guiding section 54, a cuff 6, and a main unit 7. Detailed implementation manners

[0024] To more clearly illustrate the overall concept of the present invention, the following will be further described in detail by way of examples in combination with the accompanying drawings of the specification.

[0025] It should be noted that many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0026] In addition, in the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "axial", "radial", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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 thus should not be construed as limiting the present invention.

[0027] As Figure 1 shown, the present invention provides a sphygmomanometer, including a cuff 6. The cuff 6 includes an outer cover and an inflatable and deflatable airbag disposed inside the outer cover. The airbag is provided with a nozzle communicating with the inner cavity of the airbag. It further includes a main unit 7 fixed to the cuff 6. The main unit 7 includes a pump unit for inflating the airbag, a valve unit 1 for exhausting the airbag, and a pressure sensing unit for sensing the pressure inside the inner cavity of the airbag. Among them, the valve unit 1 includes a bracket 2, a spool 3, a moving iron core 4, and an exhaust duct 5. The spool 3 is fixedly connected to the bracket 2. The moving iron core 4 is slidably connected inside the spool 3. The exhaust duct 5 has an exhaust inlet section 51 and an exhaust outlet section 52. The axial direction of the exhaust inlet section 51 is the same as the radial direction of the moving iron core 4. The exhaust inlet section 51 communicates with the exhaust outlet section 52 to form an exhaust passage. The moving iron core 4 can move between a first position blocking the exhaust passage and a second position opening the exhaust passage. The exhaust inlet section 51 communicates with the inner cavity of the airbag through the nozzle in a direction perpendicular to the surface of the cuff 6. Specifically, as Figure 7As shown, the cuff 6 is sleeved on the measured part, such as the upper position near the elbow of the human arm. The airbag in the cuff 6 realizes expansion and contraction by inflating and deflating the gas to tightly press the measured part. The main unit 7 is fixed on the surface of the cuff 6 through connecting parts such as bolts. The pump unit, valve unit 1 and pressure sensing unit inside it are respectively communicated with the air nozzle of the airbag to inflate, deflate and measure the pressure of the inner cavity of the airbag. This application can be regarded as placing the original air guide hose externally connected to the valve unit inside the valve unit to save the space of the main unit and realize the miniaturization of the main unit. The inflator pump in the main unit 7 continuously inflates when pressurizing the inner cavity of the airbag. When the inner cavity of the airbag deflates, part of the gas can be discharged from the inner cavity of the airbag through the inflator pump, but the gas discharged through the inflator pump is relatively less and the speed is slower. The valve unit 1 in the main unit 7, such as Figure 1 As shown, it has a bracket 2. A moving iron core 4 is arranged inside the bracket 2. A spool 3 is sleeved outside the moving iron core 4. An electromagnetic coil is sleeved outside the spool 3. The moving iron core 4 can slide inside the spool 3. The electromagnetic coil is used to drive the moving iron core 4 to move. A spring is also arranged between the bracket 2 and the moving iron core 4. The spring is used to control whether the valve unit 1 is a normally open valve or a normally closed valve. When the electromagnetic coil is energized, the moving iron core 4 moves in the direction of overcoming the action of the spring. On the left side of the moving iron core 4, an exhaust duct 5 is also arranged inside the bracket 2. The exhaust duct 5 has an exhaust inlet section 51 perpendicular to the axial direction of the moving iron core 4. When the airbag is located below the valve unit 1 as shown in the figure, the air nozzle of the airbag is arranged upward. The valve unit 1 can be inserted straight down to connect the exhaust inlet section 51 to the air nozzle, so that the exhaust channel formed by the inner cavity of the airbag and the exhaust duct 5 is communicated, and the gas in the inner cavity of the airbag is discharged from the inner cavity of the airbag through the exhaust inlet section 51 and the exhaust outlet section 52 in sequence. Therefore, an exhaust inlet section 51 along the radial direction of the moving iron core 4 is arranged inside the valve, that is, there is no need to connect a steering guide hose outside the valve unit 1, saving the space inside the main unit 7 and reducing the assembly procedure. An exhaust channel is formed inside the exhaust duct 5. The electromagnetic coil controls the opening or blocking of the exhaust channel by driving the moving iron core 4. When the moving iron core 4 opens the exhaust channel, the airbag is in a deflated state. When the moving iron core 4 blocks the exhaust channel, the airbag is in an inflated state.

[0028] In an embodiment of the present application, such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 6 As shown, a plugging hole 53 communicating with the exhaust channel is opened on the pipe wall of the exhaust duct 5. When the moving iron core 4 extends into the exhaust channel through the plugging hole 53 and blocks the exhaust channel, the moving iron core 4 is located at the first position. In this embodiment, a plugging hole 53 is opened on the pipe wall of the exhaust duct 5, such as Figure 2As shown, the exhaust outlet section 52 of the exhaust duct 5 is horizontally arranged, and the exhaust inlet section 51 is vertically arranged. The moving iron core 4 can extend into the exhaust outlet section 52 through the blocking hole 53. Through the cooperation between the end of the moving iron core 4 and the side wall of the exhaust outlet section 52, the gas passage in the exhaust outlet section 52 is blocked, so that the gas in the airbag inner cavity cannot be discharged from the exhaust outlet section 52. Those skilled in the art can understand that by opening the blocking hole 53 in the wall of the exhaust duct 5, the orientation of the air outlet on the exhaust outlet section 52 is not restricted, and the axial direction of the exhaust outlet section 52 and the position of the air outlet can be designed and selected according to needs. Additionally, preferably, the air outlet can also extend out of the bracket 2 to directly discharge the gas in the airbag out of the bracket 2.

[0029] A further optimization of the present invention is that the exhaust outlet section 52 is arranged along the moving direction of the moving iron core 4, and the exhaust outlet section 52 extends away from the moving iron core 4 and extends out of the bracket 2. The moving iron core 4 can extend into the exhaust outlet section 52 through the blocking hole 53 to block the exhaust passage in the exhaust outlet section 52. As Figure 2 、 Figure 3 shown, the valve can be a normally closed electromagnetic air release valve, and the axis of the exhaust outlet section 52 coincides with the axis of the moving iron core 4. Figure 2 It is a cross-sectional view when the moving iron core 4 is in the first position in an embodiment. Figure 3 It is a cross-sectional view when the moving iron core 4 is in the second position. When the electromagnetic coil is not powered on, the spring supports the moving iron core 4 to make the moving iron core 4 located at the position as Figure 2 shown, blocking the exhaust passage. When the airbag of the sphygmomanometer needs to be deflated, the electromagnetic coil is powered on. The electromagnetic coil drives the moving iron core 4 to overcome the supporting force of the spring, making the moving iron core 4 move away from the exhaust duct 5, that is, move to the second position as Figure 3 shown, so that the exhaust passage is connected, and the gas in the airbag inner cavity can be discharged through the exhaust duct 5. The air flow is discharged along the exhaust outlet section 52 from the direction away from the moving iron core 4, so that the gas in the airbag inner cavity directly enters outside the bracket 2, without generating an air flow impact on the various components inside the bracket 2, avoiding the influence of the air flow on other components and also avoiding the cooperation failure between the internal components of the bracket 2, affecting the exhaust effect. Additionally, the exhaust outlet section 52 is arranged along the axial direction of the moving iron core 4, which does not increase the thickness of the valve and is beneficial to the miniaturization of the main unit 7.

[0030] A further optimization of the present invention is that the edge of the blocking hole 53 extends towards the moving iron core 4 to form a guiding section 54, and a "T"-shaped exhaust passage is formed in the guiding section 54, the exhaust inlet section 51 and the exhaust outlet section 52. As Figure 2 、 Figure 3As shown, the exhaust duct 5 has a guiding section 54, an exhaust inlet section 51, and an exhaust outlet section 52. The exhaust channels in these three sections are connected to form a "T" shape. The guiding section 54 provides a guiding function for the moving iron core 4, enabling the moving iron core 4 to easily and accurately extend into the exhaust outlet section 52 to complete the blocking. Preferably, a blocking portion is formed at the end of the moving iron core 4, such as the thinner part on the left side of the moving iron core 4 in the figure. The blocking portion extends into the guiding section 54 and then into the exhaust outlet section 52 to complete the blocking. When the moving iron core 4 is in the first position, the thicker part of the moving iron core 4 abuts against the outer end face of the guiding surface, preventing gas from entering the interior of the bracket 2 through the guiding section 54 and ensuring that the components inside the bracket 2 are minimally affected by the airflow impact.

[0031] A further optimization of the present invention is that the moving iron core 4 is slidably connected within the guiding section 54, and the distance that the moving iron core 4 moves between the first position and the second position is less than or equal to the length that the moving iron core 4 extends into the exhaust channel. When the moving iron core 4 moves between the first position and the second position, the end portion extending into the guiding section 54 or the aforementioned blocking portion will never exit the exhaust duct 5. The guiding section 54 provides a continuous guiding function for the moving iron core 4, effectively avoiding potential misalignment or other hidden dangers that may occur when the moving iron core 4 is repeatedly inserted into the blocking hole 53, and ensuring the stability of the valve application.

[0032] A further optimization of the present invention is that when the moving iron core 4 is in the first position, the side wall of the moving iron core 4 fits against the inner wall of the exhaust outlet section 52 to block the gas in the exhaust inlet section 51 from entering the exhaust outlet section 52. When the moving iron core 4 extends into the exhaust outlet section 52, its side wall closely fits against the side wall of the exhaust channel in the exhaust outlet section 52. While blocking the exhaust channel in the exhaust outlet section 52, the side wall of the moving iron core 4 blocks the position where the exhaust inlet section 51 and the exhaust outlet section 52 are connected, that is, blocks the exhaust channel in the exhaust inlet section 51, achieving two-way blocking and enhancing the blocking effect. This blood pressure monitor of the present application is a blood pressure monitor for measuring blood pressure during pressurization. A good blocking effect is very important for the accurate measurement of the blood pressure monitor. Two-way blocking effectively ensures that the blood pressure monitor does not leak air during the pressurization process, making the pressure sensor more real-time and accurate when sensing the pressure in the airbag inner cavity.

[0033] In another embodiment of the present application, the axial direction of the exhaust outlet section 52 is perpendicular to the axis direction of the spool 3, and a blocking hole 53 is opened at the intersection of the exhaust outlet section 52 and the exhaust inlet section 51. As Figure 6As shown, the entire exhaust duct 5 is a vertical duct. A vertical exhaust passage is formed in the exhaust duct 5. The blocking hole 53 divides the exhaust duct 5 into an exhaust inlet section and an exhaust outlet section. In this embodiment, the lower one is the exhaust inlet section 51, and the upper one is the exhaust outlet section 52. The moving iron core 4 is horizontally inserted into the exhaust duct 5, directly blocking the exhaust passage. In this embodiment, the exhaust outlet section 52 and the exhaust inlet section 51 are coaxially designed, which can reduce the length of the valve unit 1 in the axial direction of the moving iron core 4. Those skilled in the art can understand that based on the vertical downward setting of the exhaust inlet section 51 as shown in the figure, the axial direction of the exhaust outlet section 52 can also be the direction extending out of the paper surface, which can bring the same technical effect.

[0034] In an embodiment of the present application, the exhaust inlet section 51 and the exhaust outlet section 52 are integrally formed. The exhaust inlet section 51 and the exhaust outlet section 52 are integrally formed into the exhaust duct 5 during manufacturing, so that the exhaust duct 5 has good sealing performance at the intersection of the exhaust inlet section 51 and the exhaust outlet section 52. In addition, integral forming can reduce the production and assembly processes, making the production and assembly of the valve unit 1 relatively easy.

[0035] In an embodiment of the present application, the exhaust outlet section 52 is arranged along the moving direction of the moving iron core 4, and the exhaust outlet section 52 extends in the direction close to the moving iron core 4. In the axial direction of the moving iron core 4, when the moving iron core 4 abuts against the outer end face of the exhaust outlet section 52, the moving iron core 4 is located at the first position. As Figure 4 、 Figure 5 shown, the exhaust duct 5 includes a vertically arranged exhaust inlet section 51 and an exhaust outlet section 52 arranged along the axial direction of the moving iron core 4. The air outlet of the exhaust outlet section 52 is arranged facing the moving iron core 4. As Figure 4 、 Figure 5 shown, the valve can be a normally open electromagnetic air release valve. Figure 4 In Figure 5 the moving iron core 4 is located at the second position. When the electromagnetic coil is not energized, the spring supports the moving iron core 4 at the second position away from the exhaust duct 5. The gas in the airbag cavity can be discharged from the airbag through the exhaust passage from the exhaust outlet section 52 and discharged from the electromagnetic air release valve through the inside of the bracket 2. When the airbag of the electronic sphygmomanometer needs to be inflated for pressure measurement, the electromagnetic coil is energized, and the electromagnetic coil drives the moving iron core 4 to move towards the exhaust duct 5 until the end of the moving iron core 4 abuts against the outer end face of the exhaust duct 5. The end face of the moving iron core 4 blocks the air outlet of the exhaust outlet end 52, so that the gas in the airbag cavity cannot be discharged, realizing inflation and pressurization. Those skilled in the art can understand that this valve can also be a normally closed electromagnetic air release valve. When the electromagnetic coil is not energized, the spring is in a stretched state, which pulls the moving iron core 4 to make the moving iron core 4 in the first position blocking the air outlet. When the electromagnetic coil is energized, it drives the moving iron core 4 to move to the second position to open the air outlet.

[0036] In an embodiment of the present application, when the sphygmomanometer is in a worn state, the main unit 7 has a proximal end and a distal end, and the pressure sensing unit, the valve unit 1, and the pump unit are sequentially arranged from the distal end to the proximal end. The pressure sensing unit and the pump unit are respectively arranged on both sides of the valve unit 1, which can reduce the interference caused by the vibration of the inflating pump in the pump unit to the pressure sensing unit, enabling the pressure sensing unit to obtain accurate blood pressure information, thereby ensuring the measurement accuracy. The pressure sensing unit, the valve unit 1, and the pump unit are sequentially arranged from the distal end to the proximal end. When the sphygmomanometer is arranged on the upper arm, the pressure sensing unit is arranged at the distal end, which can measure the brachial artery exposed above the biceps brachii near the elbow of the upper arm, thereby ensuring the measurement accuracy and obtaining a more accurate measurement result.

[0037] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

[0038] The above description is only for the embodiments of the present application and is not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. A sphygmomanometer, comprising: A cuff, the cuff including an outer cover and an inflatable and deflatable airbag disposed within the outer cover, the airbag being provided with a nozzle communicating with the inner cavity of the airbag; A main unit fixed to the cuff, the main unit including a pump unit for inflating the airbag, a valve unit for exhausting the airbag, and a pressure sensing unit for sensing the internal pressure of the airbag; It is characterized in that: The valve unit includes a bracket, a spool, a moving iron core, and an exhaust duct. The exhaust duct is disposed inside the bracket. The spool is fixedly connected to the bracket. The moving iron core is slidably connected within the spool. A spring is further provided between the bracket and the moving iron core. The exhaust duct has an exhaust inlet section and an exhaust outlet section. The axial direction of the exhaust inlet section is the same as the radial direction of the moving iron core. The exhaust inlet section communicates with the exhaust outlet section to form an exhaust passage. The moving iron core can move between a first position blocking the exhaust passage and a second position opening the exhaust passage. The exhaust inlet section communicates with the inner cavity of the airbag through the nozzle in a direction perpendicular to the surface of the cuff; A blocking hole communicating with the exhaust passage is formed in the wall of the exhaust duct. When the moving iron core extends into the exhaust passage through the blocking hole and blocks the exhaust passage, the moving iron core is in the first position; The exhaust outlet section is arranged along the moving direction of the moving iron core, and the exhaust outlet section extends away from the moving iron core and extends out of the bracket. The moving iron core can extend into the exhaust outlet section through the blocking hole to block the exhaust passage in the exhaust outlet section.

2. The sphygmomanometer according to claim 1, wherein: A guiding section is formed by the edge of the blocking hole extending towards the moving iron core direction. A "T"-shaped exhaust passage is formed within the guiding section, the exhaust inlet section, and the exhaust outlet section.

3. The sphygmomanometer according to claim 2, wherein: The moving iron core is slidably connected within the guiding section, and the distance that the moving iron core moves between the first position and the second position is less than or equal to the length that the moving iron core extends into the exhaust passage.

4. The sphygmomanometer according to claim 1, wherein: When the moving iron core is in the first position, the side wall of the moving iron core fits against the inner wall of the exhaust outlet section to block the gas in the exhaust inlet section from entering the exhaust outlet section.

5. The sphygmomanometer according to claim 1, wherein: The axial direction of the exhaust outlet section is perpendicular to the axial direction of the spool, and the blocking hole is formed at the intersection of the exhaust outlet section and the exhaust inlet section.

6. The sphygmomanometer according to claim 1, wherein: The exhaust inlet section and the exhaust outlet section are integrally formed.

7. The sphygmomanometer according to claim 1, wherein: The exhaust outlet section is arranged along the moving direction of the moving iron core, and the exhaust outlet section extends towards the moving iron core. In the axial direction of the moving iron core, when the moving iron core abuts against the outer end face of the exhaust outlet section, the moving iron core is in the first position.

8. The sphygmomanometer according to claim 1, wherein: In the state where the sphygmomanometer is worn, the main unit has a proximal end and a distal end, and the pressure sensing unit, the valve unit, and the pump unit are sequentially arranged along the distal end towards the proximal end.

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