CN215191507U - Sphygmomanometer - Google Patents

Abstract

The application discloses a sphygmomanometer, which comprises a cuff and a host. Wherein, the cuff comprises an outer cover and an air bag; the host is fixed on the cuff and comprises a pump unit, a valve unit and a pressure sensing unit; the valve unit comprises a movable iron core, a coil and an exhaust duct forming an air passage, wherein the coil can drive the movable iron core, and the exhaust duct is arranged on one side of the movable iron core along the axis of the coil; the exhaust guide pipe comprises an exhaust inlet section and an exhaust outlet section which are communicated with each other, the axial direction of the exhaust inlet section corresponds to the radial direction of the coil, the axial direction of the exhaust outlet section corresponds to the axial direction of the coil, the inner wall of the air passage is provided with a plugging hole communicated with the air passage, and the movable iron core is provided with a plugging part; when the movable iron core is positioned at the first position, the blocking part can enter the air passage through the blocking hole to block the air passage and the blocking hole; when the movable iron core leaves the first position, the blocking part blocks the blocking hole and opens the air passage, so that the air flow entering the air passage is discharged along the direction deviating from the movable iron core along the exhaust outlet section. The air flow is prevented from being discharged through the movable iron core, the noise is reduced, and the air tightness is good.

Description

Sphygmomanometer

Technical Field

The application relates to the technical field of medical equipment, in particular to a sphygmomanometer.

Background

Blood pressure is the lateral pressure acting on the blood vessel wall per unit area when blood flows in a blood vessel. When a cuff in an electronic sphygmomanometer surrounds a measurement part to measure blood pressure, a pressure sensor in an electronic sphygmomanometer host measures the pressure in an air bag inner cavity in the cuff to obtain the blood pressure of the measured part, but in the exhaust process of an air escape valve, airflow exhausted through an air exhaust port in the air escape valve is exhausted through a movable iron core, the position of the movable iron core is narrow, and the other parts in the air escape valve or other parts in the sphygmomanometer are easily impacted when the airflow is exhausted through the movable iron core, so that the air escape valve has high exhaust noise; in addition, the air flue plugging mode of the existing air escape valve is that the end face of the movable iron core is in sealing butt joint, the end face of the movable iron core plugs the plugging hole communicated with the air flue, the sealing reliability of the plugging hole is poor, air leakage is easy to occur, and therefore the acquired blood pressure data distortion is caused.

SUMMERY OF THE UTILITY MODEL

The application provides a sphygmomanometer, through establishing the air flue at the snuffle valve, move the mode that the iron core stretches into the air flue for the admit air and the exhaust of snuffle valve are accomplished through solitary air flue, avoid the air current through moving the iron core, have reduced impact and noise, and move the mode that the iron core stretches into the air flue and strengthened the leakproofness of shutoff, have improved the accuracy of the blood pressure data who obtains, from this, technical problem among the above-mentioned background art has been solved in this application.

A sphygmomanometer comprises a cuff and a host. The cuff comprises an outer cover and an inflatable and contractible air bag arranged on the inner side of the outer cover; the main machine is fixed on the cuff and comprises a pump unit for inflating the air bag, a valve unit for exhausting the air bag and a pressure sensing unit for sensing the internal pressure of the air bag; the valve unit is located the coil that moves the iron core including moving iron core and cover, the coil can drive and move the iron core, the valve unit is still including the exhaust duct who forms the air flue, the axis direction along the coil, exhaust duct locates the one side that moves the iron core, exhaust duct includes interconnect's exhaust induction zone and exhaust export section, exhaust induction zone axis direction is the same with the radial of coil, the axis direction of exhaust export section is the same with the axial of coil, the air flue inner wall still is equipped with the shutoff hole with the air flue intercommunication, it is equipped with the shutoff portion to move the iron core, when moving the iron core and being located the first position, the shutoff portion can get into the air flue with shutoff air flue and shutoff hole through the shutoff hole, when moving the iron core and leaving the first position, shutoff portion shutoff hole just opens the air flue, so that the air current that gets into the air flue is discharged with the direction that deviates from moving the iron core along exhaust export section.

This application is through the mode of establishing the air flue at the valve unit for when the valve unit exhausts to the gasbag, gas can directly discharge into the external world through the air flue. From this, when avoiding gaseous entering and discharge valve unit, the air current flows the regional too big problem that leads to exhaust noise that moves the iron core place, and the air current can be at the relatively steady circulation of air flue, and the air flue cross-section keeps relatively fixed, and the exhaust process is more silent. Further, this application is through moving the shutoff portion of iron core with the shutoff hole shutoff, for among the prior art with the sealed structure of terminal surface butt, stretch into the shutoff portion in the shutoff hole, realize circumferential sealing, sealed effect is more reliable.

In addition, this application establishes the exhaust duct who has the air flue in the valve unit to exhaust duct has one section along the mode of moving the radial exhaust induction zone of iron core, makes when gasbag surface and when moving iron core axial direction parallel, the air cock that the exhaust induction zone can cut straightly the gasbag surface need not the external air guide hose of valve unit, has reduced the installation procedure of host computer, has realized the integration of valve unit, has saved the space of host computer, does benefit to the host computer miniaturization.

In an embodiment of the application, the shutoff hole is located the junction of exhaust inlet section and exhaust outlet section, and movable iron core, shutoff hole, exhaust outlet section set up coaxially.

The blocking hole is formed at the joint of the exhaust inlet section and the exhaust outlet section, and the thickness of the valve unit can be reduced by coaxially arranging the movable iron core, the blocking hole and the exhaust outlet section, so that the sphygmomanometer is convenient to miniaturize, is lighter and more convenient, and greatly improves the application environment of the sphygmomanometer; the movable iron core, the plugging hole and the exhaust outlet section are coaxially arranged, so that the integral structure is easy to assemble.

In an embodiment of the application, along the direction of keeping away from movable iron core, the inner wall diameter of at least part exhaust outlet section reduces gradually, and the one end of shutoff portion can have the round platform of the sealed butt of inner wall with exhaust outlet section to when movable iron core is located the first position, the shutoff portion can pass through round platform shutoff air flue.

The diameter of the inner wall of the exhaust outlet section is gradually reduced, one end of the blocking part can be in a round table shape which is in sealing butt joint with the inner wall of the exhaust outlet section, when the blocking part blocks the air passage, the joint surface of the blocking part and the air passage of the exhaust outlet section is larger and more compact, air tightness is improved, sealing between the blocking part and the inner wall of the exhaust outlet section is prevented from having a gap, air leakage is caused, unexpected exhaust is caused in the process of measuring the blood pressure, and accuracy of measuring the blood pressure is influenced.

In one embodiment of the present application, a seal ring is provided between the plugging portion and the inner wall of the plugging hole.

Through set up the sealing washer between shutoff portion and shutoff downthehole wall, can further improve the sealed effect of shutoff portion shutoff air flue, avoid taking place the condition of gas leakage.

In an embodiment of the application, form the ring channel along shutoff hole inner wall, the sealing washer inlays and locates in the ring channel, and the sealing washer forms sliding seal with the shutoff portion.

Through forming the ring channel along the shutoff downthehole wall, inlay the sealing washer in locating the ring channel, make the sealing washer be the immobile piece, and then make and form sliding seal's setting between sealing washer and shutoff portion, can effectively improve the life of sealing washer and shutoff portion and the sealed effect in shutoff hole, guarantee blood pressure measurement's accuracy.

In an embodiment of the application, form the annular groove along shutoff portion surface, be equipped with the sealing washer in the annular groove, the sealing washer forms sliding seal with shutoff downthehole wall.

Through forming the ring channel along shutoff portion surface, be equipped with the sealing washer in the ring channel, the sealing washer forms sliding seal's mode with shutoff downthehole wall for the sealing washer can move along with the motion of shutoff portion, thereby the sealing washer can both be sealed the shutoff hole in the position of difference, avoids leaking gas, makes the sealing washer install easily in addition.

In one embodiment of the application, the valve unit further comprises a housing having an inner cavity holding the plunger, the coil and the exhaust gas duct, at least part of the exhaust gas inlet section and/or at least part of the exhaust gas outlet section being arranged in the inner cavity. Therefore, the connection between the exhaust guide pipe and the shell is improved, and the whole structure is stable and firm.

In one embodiment of the present application, the valve unit further includes a bobbin for winding the coil, the bobbin being sleeved on the movable iron core and fixedly connected to the housing.

From this setting, the spool can play direction and fixed action to moving the iron core, reduces and moves the radial rocking that takes place among the iron core motion process to reduce the wearing and tearing between shutoff portion and the shutoff hole inner wall, improve the gas tightness of valve unit and then guarantee the measurement accuracy of sphygmomanometer, improve valve unit's life.

In one embodiment of the present application, the main unit has a proximal end and a distal end in a wearing state of the sphygmomanometer, and the pressure sensing unit, the valve unit and the pump unit are sequentially disposed from the distal end to the proximal end.

From this setting, pressure sensing unit locates the one side of valve unit, and pump unit locates the opposite side of valve unit, can reduce pump unit to the interference of pressure sensing unit measurement, guarantees blood pressure measurement's accuracy.

In one embodiment of the present application, the cross-sectional area of the airway is equal everywhere.

The sectional area of the air passage is arranged at equal positions, so that the fluctuation degree of air caused by the sectional area change of the air passage during air exhaust can be reduced, the air exhaust is smooth and stable, and the accuracy of blood pressure measurement is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic perspective view of a sphygmomanometer according to an embodiment of the present application;

FIG. 2 is a schematic cross-sectional view of a valve unit of a sphygmomanometer according to an embodiment of the present disclosure;

FIG. 3 is a schematic cross-sectional view of another state of the valve unit of the sphygmomanometer shown in FIG. 2;

FIG. 4 is a schematic cross-sectional view of a valve unit of a sphygmomanometer according to another embodiment of the present disclosure;

fig. 5 is a schematic diagram of a wearing state of a sphygmomanometer provided by the present application.

1 cuff

11 outer cover

12 air bag

2 host

21 pump unit

22-valve unit

221 movable iron core

2211 blocking part

22111 round table

222 coil

223 airway

2231 plugging the hole

22311 annular grooves

224 exhaust conduit

2241 exhaust inlet section

2242 exhaust outlet section

225 sealing ring

226 outer casing

2261 inner chamber

227 bobbin

23 pressure sensing unit

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be clearly and completely described below with reference to the detailed description of the present application and the accompanying drawings. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

As shown in fig. 1, a sphygmomanometer includes a cuff 1 and a host 2. Wherein, the cuff 1 comprises an outer cover 11 and an inflatable and contractible air bag 12 arranged at the inner side of the outer cover 11; the main unit 2 is fixed to the cuff 1, and the main unit 2 includes a pump unit 21 for inflating the airbag 12, a valve unit 22 for exhausting the airbag 12, and a pressure sensing unit 23 for sensing the internal pressure of the airbag 12.

When in use, the outer cover 11 is sleeved on the upper arm of a user, the pump unit 21 inflates the air bag 12, the valve unit 22 is in a closed state at the moment, the internal pressure in the air bag 12 rises and expands, the artery of the measurement part of the user is pressed, and the blood flow is blocked; the valve unit 22 is then switched to the open state, the balloon 12 is deflated and retracted, and blood flow at the user's measurement site is again allowed. When the blood flows again, the internal pressure in the balloon 12 changes, and the pressure sensing means 23 senses the change, monitors the change in the internal pressure in the balloon 12, and measures the blood pressure of the user.

As shown in fig. 2, a schematic cross-sectional structure of a valve unit 22 of a sphygmomanometer, the valve unit 22 includes a movable iron core 221 and a coil 222 sleeved on the movable iron core 221, the coil 222 can drive the movable iron core 221 to move along an axial direction of the coil 222, the valve unit 22 further includes an exhaust duct 224 forming an air passage 223, the exhaust duct 224 is disposed on one side of the movable iron core 221 along an axial direction of the coil 222, the exhaust duct 224 includes an exhaust inlet section 2241 and an exhaust outlet section 2242 connected to each other, the axial direction of the exhaust inlet section 2241 is the same as the radial direction of the coil 222, the axial direction of the exhaust outlet section 2242 is the same as the axial direction of the coil 222, a blocking hole 2231 communicated with the air passage 223 is further disposed on an inner wall of the air passage 223, and the movable iron core 221 is provided with a blocking portion 2211.

The valve unit 22 shown in fig. 2 is a normally closed electromagnetic valve, the spring allows the plunger 221 to be located at the first position shown in fig. 2, and when the plunger 221 is located at the first position, the blocking portion 2211 can enter the air passage 223 through the blocking hole 2231 to block the air passage 223 and the blocking hole 2231, so that the gas cannot be discharged to the outside through the exhaust duct 224; when the coil 222 is energized, the coil 222 generates a magnetic field, so that the magnetic field acts on the plunger 221, the plunger 221 moves rightward as shown in fig. 2, the plunger 221 leaves the first position, the blocking portion 2211 blocks the blocking hole 2231 and simultaneously opens the air passage 223, that is, the valve unit 22 is in the state shown in fig. 3, so that the air flow entering the air passage 223 is discharged along the exhaust outlet section 2242 in a direction away from the plunger 221, and the air flow entering the air passage 223 in the exhaust duct 224 is directly discharged to the outside. Therefore, the problem that when gas enters and exits the valve unit 22, the exhaust noise is too high due to the fact that the gas flow flows through the area where the movable iron core 221 is located is solved, the gas flow can flow in the gas channel relatively stably, the cross section of the gas channel is kept relatively fixed, and the exhaust process is quite silent. Further, this application is through the shutoff portion 2211 of movable iron core 221 with the shutoff hole 2231 shutoff, for among the prior art with the sealed structure of terminal surface butt, stretch into shutoff hole 2231 with shutoff portion 2211, realize circumferential sealing, sealed effect is more reliable.

In addition, the exhaust duct 224 with the air passage 223 is established in the valve unit 22, and the exhaust duct 224 has a section of exhaust inlet section 2241 along the radial direction of the movable iron core 221, so that when the surface of the airbag 12 is axially parallel to the movable iron core 221, the exhaust inlet section 2241 can be directly inserted into the air nozzle on the surface of the airbag 12, an air guide hose is not required to be externally connected with the valve unit 33, the installation process of the host machine 2 is reduced, the integration of the valve unit 22 is realized, the space of the host machine 2 is saved, and the miniaturization of the host machine 2 is facilitated.

The external space described herein refers to a space communicating with the outside of the sphygmomanometer, and it will be understood by those skilled in the art that when the valve unit 22 has a housing, an internal cavity of the housing is directly connected to the outside of the sphygmomanometer, the exhaust outlet section 2242 may be provided inside the housing, and the gas in the exhaust duct 224 is exhausted to the outside of the sphygmomanometer through the internal cavity of the housing; alternatively, the exhaust outlet section 2242 extends directly to the exterior of the sphygmomanometer, and the gas is discharged directly to the exterior of the sphygmomanometer through the exhaust duct 224. Therefore, other components near the outlet of the exhaust duct 224 in the exhaust process are prevented from having an obstruction effect on the exhaust, so that the gas in the airbag 12 fluctuates and influences the measurement result. The above description of "the movable core 221 moves rightward as shown in fig. 2" is merely for convenience of explanation with reference to the drawings, and is not intended to limit the present application.

The utility model discloses a technical field's technical field can understand, electromagnetism bleeder not only has normal close formula electromagnetism bleeder, still normal open formula electromagnetism bleeder, exhaust duct 224 also can be applied to in the normal open formula electromagnetism bleeder, movable iron core 221 leaves first position under the effect of spring, make air flue 223 communicate, shutoff portion 2211 seals shutoff hole 2231, make the gas that gets into exhaust duct 224 pass through exhaust inlet section 2241, air flue 223 among the exhaust outlet section 2242 gets into the external world, when coil 222 circular telegram, movable iron core 221 moves first position under the effect of the produced magnetic field of coil 222, thereby shutoff portion 2211 gets into air flue 223 with sealing air flue 223 and shutoff hole 2231 through shutoff hole 2231, make gas can't discharge to the external world through air flue 223 in the exhaust duct 224.

As shown in fig. 2, the sectional areas of the air passages 223 are equal everywhere, when the gas is discharged into the outside through the exhaust duct 224, the sectional areas of the air passages 223 are not changed, so that the gas can be discharged into the outside more smoothly, the situation that the gas in the exhaust duct 224 fluctuates due to the change of the sectional areas of the air passages 223 is avoided, the situation that the gas in the air bag 12 fluctuates is avoided, and the situation that the pressure value of the air bag 12 obtained by the pressure sensing unit 23 is inaccurate due to the fluctuation of the gas in the air bag 12 is avoided, so that the accuracy of the blood pressure measurement is improved.

As shown in fig. 2, the blocking hole 2231 is disposed at the connection between the exhaust inlet section 2241 and the exhaust outlet section 2242, the movable iron core 221, the blocking hole 2231 and the exhaust outlet section 2242 are coaxially disposed, the diameter of the inner wall of at least a part of the exhaust outlet section 2242 is gradually reduced along the direction away from the movable iron core 221, and one end of the blocking portion 2211 can have a circular truncated cone 22111 in sealing contact with the inner wall of the exhaust outlet section 2242, so that when the movable iron core 221 is located at the first position, the blocking portion 2211 can block the air passage 223 through the circular truncated cone 22111.

The setting of the junction of exhaust inlet section 2241 and exhaust outlet section 2242 is located to shutoff hole 2231, can reduce valve unit 22's thickness, and the sphygmomanometer of being convenient for is miniaturized for the sphygmomanometer is lighter, has improved the application environment of sphygmomanometer greatly. The movable iron core 221, the blocking hole 2231 and the exhaust outlet section 2242 are coaxially arranged, so that the blocking portion 2211 arranged on the movable iron core 221 can be directly inserted into the blocking hole 2231 in the axial direction, the blocking portion 2211 can be easily combined with the blocking hole 2231, and assembly is easy. By gradually reducing the diameter of the inner wall of at least part of the exhaust outlet section 2242 along the direction away from the movable iron core 221, one end of the blocking part 2211 can be provided with a round table 22111 in sealing contact with the inner wall of the exhaust outlet section 2242, so that the joint area of the blocking part 2211 and the exhaust outlet section 2242 in the valve unit 22 is larger, the sealing effect of the blocking part 2211 can be improved, the situation that gas is unexpectedly discharged through the exhaust outlet section 2242 due to poor sealing between the blocking part 2211 and the exhaust outlet section 2242 is avoided, and the accuracy of blood pressure measurement is ensured; simultaneously, because the inner wall diameter of foretell exhalant outlet section 2242 changes to and can with the shutoff portion 2211 of the inner wall butt that the diameter changes, when making shutoff portion 2211 motion shutoff air flue 223, shutoff portion 2211 can be because exhalant outlet section 2242's diameter changes, the position is adjusted by oneself, make shutoff portion 2211 and exhalant outlet section 2242 possess better axiality, thereby guarantee the compactness of combination, improve sealed effect, and then improve blood pressure measurement's accuracy.

In addition, the position of the blocking hole 2231 is not limited to the connection between the exhaust inlet section 2241 and the exhaust outlet section 2242, and as shown in the schematic cross-sectional structure of the valve unit 22 of the sphygmomanometer in fig. 4, the position of the blocking hole 2231 is located at a certain side wall of the exhaust inlet section 2241, at this time, the blocking portion 2211 can still complete the actions of entering the air passage 223 through the blocking hole 2231 to block the air passage 223 and the blocking hole 2231, and completing the actions of blocking the blocking hole 2231 and opening the air passage 223 to discharge the air flow entering the air passage 223 along the exhaust outlet section 2242 in the direction away from the plunger 221.

As shown in fig. 2, a seal ring 225 is disposed between the blocking portion 2211 and the inner wall of the blocking hole 2231, an annular groove 22311 is formed along the inner wall of the blocking hole 2231, the seal ring 225 is fitted in the annular groove 22311, and the seal ring 225 and the blocking portion 2211 form a sliding seal. The seal ring 225 is embedded in the annular groove 22311 of the plugging hole 2231, and the seal ring 225 is a stationary member, so that the service life of the seal ring 225 can be effectively prolonged. The sealing ring 225 is arranged between the blocking portion 2211 and the blocking hole 2231, and the blocking portion 2211 and the sealing ring 225 are matched to enhance the sealing effect on the blocking hole 2231, so that when the blocking portion 2211 is prevented from disconnecting the air channel 223, air enters the outside through the blocking hole 2231, the fluctuation of the air is avoided, and the accuracy of blood pressure measurement is ensured.

This application technical field's technical field can understand, the setting of the sealing washer in this application not only can be as above-mentioned locate the shutoff hole 2231 inner wall, can also locate other positions, if form the annular groove along shutoff portion 2211 surface, be equipped with the sealing washer in the annular groove, the sealing washer forms sliding seal with shutoff hole 2231 inner wall. The shutoff portion 2211 is located to the sealing washer, can follow the motion of shutoff portion 2211, thereby the sealing washer can strengthen the sealed to shutoff hole 2231 in the position cooperation shutoff portion 2211 of difference, thereby avoid gas to discharge into the external world through shutoff hole 2231, avoid causing the condition of gas fluctuation to take place because of gas leakage, guarantee blood pressure measurement's accuracy, still make the sealing washer need not to stretch into in the shutoff hole 2231 and install in addition, improve the visuality of installation, easily the assembly.

As shown in fig. 2, the valve unit 22 further includes a housing 226, the housing 226 having a cavity 2261 holding the plunger 221, the coil 222 and the degassing conduit 224, at least part of the degassing inlet section 2241 and/or at least part of the degassing outlet section 2242 being disposed in the cavity 2261 of the housing 226. The valve unit 22 further includes a bobbin 227 for winding the coil 222, and the bobbin 227 is sleeved on the plunger 221 and fixedly connected to the housing 226. By the arrangement, the connectivity of the exhaust conduit 224 and the shell 226 is improved, so that the whole structure is stable and firm; the bobbin 227 can guide and fix the movable iron core 221, so that the movable iron core 221 is prevented from shaking in the movement process when the coil 222 drives the movable iron core 221 to move, abrasion between the blocking portion 2211 and the inner wall of the blocking hole 2231 is caused, the blocking portion 2211 and the blocking hole 2231 are not tightly combined or even dislocated, gas leakage is caused, the air tightness of the valve unit 22 is improved, the measurement accuracy of the sphygmomanometer is guaranteed, and the service life of the valve unit 22 is prolonged.

As shown in fig. 5, in an embodiment of the present application, in a wearing state of the sphygmomanometer, the main unit 2 has a proximal end and a distal end, and the pressure sensing unit 23, the valve unit 22 and the pump unit 21 are arranged in this order from the distal end to the proximal end.

The pressure sensing unit 23 and the pump unit 21 are respectively arranged on two sides of the valve unit 22, so that the interference of the pump unit 21 on the pressure sensing unit 23 can be reduced, the pressure sensing unit 23 can acquire accurate blood pressure information, and the measurement is ensured. The pressure sensing unit 23, the valve unit 22 and the pump unit 21 are sequentially arranged from the far end to the near end, when the sphygmomanometer is arranged on the upper arm, the pressure sensing unit 23 is arranged at the far end, and can measure the brachial artery exposed above the biceps brachii near the elbow of the upper arm, so that the measurement precision is ensured, and a more accurate measurement result is obtained.

Those skilled in the art will understand that the pump unit 21 not only has the inflation function as described above, but also the pump unit 21 itself can exhaust air, and can exhaust air when the air bag 12 is not inflated, so that the pump unit 21 and the valve unit 22 can exhaust air synchronously during the exhaust process of the valve unit 22, thereby improving the deflation efficiency, and facilitating the rapid exhaust and storage after the sphygmomanometer is used; further, the pump unit 21 is always in a slow exhaust state, so that it is not necessary to provide an additional structure for controlling the exhaust of the pump unit 21, which is advantageous for the miniaturization of the sphygmomanometer.

The above description is only an embodiment of the present application, and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (10)

1. A sphygmomanometer, comprising:

a cuff including an outer cover and an inflatable and deflatable bladder disposed inside the outer cover;

the host machine is fixed on the cuff and comprises a pump unit for inflating the air bag, a valve unit for exhausting the air bag and a pressure sensing unit for sensing the internal pressure of the air bag;

the valve unit comprises a movable iron core and a coil sleeved on the movable iron core, and the coil can drive the movable iron core;

the method is characterized in that:

the valve unit also comprises an exhaust guide pipe forming an air passage, the exhaust guide pipe is arranged on one side of the movable iron core along the axial direction of the coil, the exhaust duct comprises an exhaust inlet section and an exhaust outlet section which are connected with each other, the axial direction of the exhaust inlet section is the same as the radial direction of the coil, the axial direction of the exhaust outlet section is the same as the axial direction of the coil, the inner wall of the air passage is also provided with a plugging hole communicated with the air passage, the movable iron core is provided with a blocking part, when the movable iron core is positioned at a first position, the blocking part can enter the air passage through the blocking hole to block the air passage and the blocking hole, when the movable iron core leaves the first position, the blocking part blocks the blocking hole and opens the air passage, so that the airflow entering the air passage is discharged along the exhaust outlet section in the direction away from the movable iron core.

2. The sphygmomanometer according to claim 1, wherein the blocking hole is provided at a junction between the exhaust inlet section and the exhaust outlet section, and the plunger, the blocking hole and the exhaust outlet section are coaxially disposed.

3. The sphygmomanometer according to claim 2, wherein the diameter of the inner wall of at least a portion of the exhaust outlet section is gradually reduced in a direction away from the movable iron core, and one end of the sealing portion can have a truncated cone in sealing abutment with the inner wall of the exhaust outlet section, so that the sealing portion can seal the air passage through the truncated cone when the movable iron core is located at the first position.

4. A sphygmomanometer according to claim 1, wherein a sealing ring is provided between the blocking portion and an inner wall of the blocking hole.

5. A sphygmomanometer according to claim 4, wherein an annular groove is formed along an inner wall of the occlusion hole, the seal ring is fitted in the annular groove, and the seal ring forms a sliding seal with the occlusion part.

6. A sphygmomanometer according to claim 4, wherein an annular groove is formed along an outer surface of the occlusion portion, the seal ring is provided in the annular groove, and the seal ring forms a sliding seal with an inner wall of the occlusion hole.

7. A sphygmomanometer according to claim 1, wherein the valve unit further comprises a housing having an inner chamber in which the plunger, the coil and the exhaust conduit are fixed, at least part of the exhaust inlet section and/or at least part of the exhaust outlet section being provided.

8. A sphygmomanometer according to claim 7, wherein the valve unit further comprises a bobbin for winding the coil, the bobbin being fitted over the plunger and fixedly connected to the housing.

9. A sphygmomanometer according to claim 1, wherein the main unit has a proximal end and a distal end, and the pressure sensing unit, the valve unit and the pump unit are disposed in this order from the distal end to the proximal end in the wearing state of the sphygmomanometer.

10. A sphygmomanometer according to claim 1, wherein the cross-sectional area of the airway is equal everywhere.

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