Sphygmomanometer

Abstract

The utility model discloses a sphygmomanometer which comprises a reducing ring arranged in an arm cylinder and used for wrapping an arm part under the driving of a driving mechanism; the driving mechanism comprises a first transmission part, a first driving assembly, a second transmission part and a second driving part, one end of the first transmission part is connected with one end of the variable-diameter ring, and the first driving assembly is meshed with the first transmission part and controls the first transmission part to move so as to change the diameter of the variable-diameter ring; the second transmission part is arranged below the second driving part and controls the second driving part to move up and down, so that the second driving part and the first transmission part have a first state of abutting against each other and a second state of separation; the first air bag is arranged at the other end, away from the first transmission part, of the reducing ring. And the controller is used for controlling the first driving assembly to work so as to control the second transmission part to work when the diameter of the variable-diameter ring is driven to be matched with the arm part, so that the second driving part is driven to have the first state. The sphygmomanometer can conduct self-locking on the reducing ring through the second driving piece, and the self-locking safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a blood pressure monitor. Background Technology

[0002] Blood pressure monitors are commonly used instruments for measuring blood pressure. Most blood pressure monitors used in daily life are cuff-type blood pressure monitors. Cuff-type blood pressure monitors measure blood pressure by manually wrapping the cuff around the arm. Elderly people have slower reaction times when operating them, and it is difficult for them to manually wrap the cuff around their arm with one hand. In addition, there are problems such as different tightness and different positions of the cuff, which can lead to inaccurate measurement results.

[0003] To address the difficulties of wrapping the cuff around the arm and the measurement distortion caused by varying tightness and position of the cuff, existing technology proposes an automatic blood pressure monitor. The cuff is tightened by the pulling force of a motor. When the motor is powered on, it rotates forward and pulls one end of the cuff, which is then tightly wrapped around the upper arm of the tester for measurement. After the measurement is completed, the motor is powered on in reverse, causing the cuff to rotate back, and the tester removes their arm.

[0004] However, this automatic blood pressure monitor relies entirely on the forward and reverse rotation of the motor to tighten or loosen the cuff. If the blood pressure monitor experiences a power outage during use, the cuff will not tighten or loosen. Utility Model Content

[0005] In view of this, the present invention provides a blood pressure monitor to solve the problem that existing blood pressure monitors cannot tighten or loosen the cuff if a power outage occurs during use.

[0006] In a first aspect, this utility model provides a blood pressure monitor, comprising: an arm cylinder, a variable diameter ring, a drive mechanism, a first air bladder, and a controller; the variable diameter ring is disposed inside the arm cylinder and is used to wrap around the arm under the drive of the drive mechanism; the drive mechanism includes a first transmission member, a first drive assembly, a second transmission member, and a second drive member; one end of the first transmission member is connected to one end of the variable diameter ring; the first drive assembly meshes with the first transmission member and controls the movement of the first transmission member to change the diameter of the variable diameter ring; the second transmission member is disposed below the second drive member and controls the up and down movement of the second drive member, so that the second drive member and the first transmission member have a first contact state and a second separation state; the first air bladder is disposed at the other end of the variable diameter ring away from the end connected to the first transmission member; the controller is used to control the first drive assembly to work so that when the diameter of the variable diameter ring is adapted to the arm, it controls the second transmission member to work so that the second drive member has the first state.

[0007] Beneficial effects: The blood pressure monitor uses a first drive component to drive the variable diameter coil to change its diameter, thereby tightening or loosening the coil. At the same time, a second drive component locks and releases the variable diameter coil. This way, even if the first drive component loses power, it will not affect the second drive component's locking and releasing of the variable diameter coil. This allows the blood pressure monitor to complete the locking and releasing actions even if the first drive component malfunctions, improving the reliability and safety of the blood pressure monitor.

[0008] In one optional embodiment, the first transmission member has a plurality of first teeth on the side facing away from the variable diameter ring, and the first drive assembly is connected to the first transmission member by tooth meshing. The second drive member has a plurality of second teeth on the side facing the first transmission member, and the second drive member is connected to the first transmission member by tooth meshing in the first state.

[0009] In one optional embodiment, the first drive assembly includes: a first drive mechanism having a rotating shaft; a gear shaft connected to the rotating shaft via a transmission belt, the gear shaft meshing with a first transmission member, the gear shaft driving the first transmission member to rotate during rotation, and the first transmission member driving the variable diameter ring to change diameter.

[0010] In one alternative embodiment, the first transmission member is disposed above the second driving member, and the gear shaft is located between the first transmission member and the second driving member and meshes with the first transmission member.

[0011] In one alternative embodiment, the second driving member includes: at least one locking part, the locking part having a second tooth on the side facing the first driving member; and a clearance groove, provided on the side of the locking part facing the tooth shaft, the clearance groove being used to avoid the tooth shaft when the second driving member moves.

[0012] In one alternative embodiment, there are two locking parts, with a clearance groove between the two locking parts, and the two locking parts are arranged to be distributed along the arcuate trajectory of the first transmission member.

[0013] In one optional embodiment, the second driving member is disposed above the second transmission member, and the second transmission member includes a second airbag. When the second airbag is inflated, it pushes the second driving member to rise, which is a first state. When the second airbag is deflated, the second driving member descends, which is a second state.

[0014] In one alternative embodiment, the relief groove and the two locking parts are configured as an integral structure, the bottom of the locking parts is configured as a flat surface, and the second airbag is configured to be attached to the bottom of the locking parts and used to drive the relief groove and the two locking parts to rise and fall synchronously.

[0015] In one alternative embodiment, a cloth cover is provided inside the first airbag, and a piezoelectric sensor is provided between the cloth cover and the first airbag. The piezoelectric sensor is configured to always be located at the brachial artery measurement position in the arm during the diameter change of the variable diameter ring.

[0016] In one alternative embodiment, the drive mechanism further includes a detachably connected first seat and a second seat, with an accommodating space between the first seat and the second seat for accommodating the first drive assembly, the second drive member, and the second transmission member. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram showing the disassembled structure of a blood pressure monitor according to an embodiment of the present utility model;

[0019] Figure 2 for Figure 1 The front view of the blood pressure monitor shown;

[0020] Figure 3 for Figure 2 The isometric view of the sphygmomanometer shown;

[0021] Figure 4 for Figure 2 A schematic diagram of a partial structure of a blood pressure monitor is shown.

[0022] Figure 5 This is a schematic diagram of the drive mechanism according to an embodiment of the present utility model;

[0023] Figure 6 This is a partial structural schematic diagram of the drive mechanism according to an embodiment of the present utility model;

[0024] Figure 7 This is a schematic diagram of the structure of the second driving component according to an embodiment of the present utility model;

[0025] Figure 8 This is a schematic diagram of the structure of the first transmission component in an embodiment of the present utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Variable diameter ring; 2. First transmission component; 201. First tooth; 3. Second transmission component; 4. Second drive component; 401. Locking part; 4011. Second tooth; 402. Relief groove; 5. First drive mechanism; 51. Rotating shaft; 6. Gear shaft; 7. First seat; 8. Second seat; 9. Arm cylinder; 10. First airbag; 11. Fabric cover; 12. Piezoelectric sensor; 13. Transmission belt; 100. Drive mechanism; 110. First drive assembly. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] To address the issue of existing blood pressure monitors failing to tighten or loosen their cuffs after a power outage, related technologies have proposed using a self-locking worm geared motor as the power source. When the cuff is tightened, the worm geared motor self-locks after a power outage, ensuring the cuff does not spring back during measurement and thus guaranteeing measurement accuracy. However, if a sudden power outage occurs during measurement, the self-locking function of the motor prevents the cuff from loosening, making it impossible for the person being measured to remove their arm from the monitor. This can lead to poor blood circulation in the arm, posing a significant safety hazard.

[0030] In order to enable the blood pressure monitor to simultaneously achieve the purpose of self-locking and releasing the variable diameter coil during power failure, the embodiments of this application propose to drive the variable diameter coil to change its diameter through a first driving component, and simultaneously lock and release the variable diameter coil through a second driving component. In this way, even if the first driving component is de-energized, it will not affect the second driving component's locking and releasing of the variable diameter coil, thereby improving the reliability and safety of the blood pressure monitor.

[0031] The following is combined Figures 1 to 8 The following describes embodiments of the present invention.

[0032] like Figures 1 to 5 As shown, according to an embodiment of the present invention, a blood pressure monitor is provided, including an arm cylinder 9, a variable diameter ring 1, a drive mechanism 100, a first air bladder 10, and a controller. The variable diameter ring 1 is disposed inside the arm cylinder 9 and is used to wrap around the arm under the drive of the drive mechanism 100. The drive mechanism 100 includes a first transmission member 2, a first drive assembly 110, a second transmission member 3, and a second drive member 4. One end of the first transmission member 2 is connected to one end of the variable diameter ring 1. The first drive assembly 110 meshes with the first transmission member 2 and controls the movement of the first transmission member 2 to change the diameter of the variable diameter ring 1. The second transmission member 3 is disposed below the second drive member 4 and controls the up and down movement of the second drive member 4 so that the second drive member 4 and the first transmission member 2 have a first state of contact and a second state of separation. The first air bladder 10 is disposed at the other end of the variable diameter ring 1 away from the end connected to the first transmission member 2. The controller is used to control the first drive assembly 110 to work so that when the diameter of the variable diameter ring 1 is adapted to the arm, it controls the second transmission member 3 to work so that the second drive member 4 has the first state.

[0033] In this embodiment, the blood pressure monitor drives the variable diameter ring 1 to change its diameter through the first drive component 110, thereby achieving the purpose of tightening or loosening the variable diameter ring 1. At the same time, the second drive component 4 locks and loosens the variable diameter ring 1. In this way, even if the first drive component 110 is de-energized, it will not affect the second drive component 4 in locking and loosening the variable diameter ring 1. This allows the blood pressure monitor to complete the measurement and loosening actions even if the first drive component 110 malfunctions, thus improving the reliability and safety of the blood pressure monitor.

[0034] Specifically, the first drive assembly 110 includes a motor assembly, and the second drive component 4 includes pneumatic drive, hydraulic drive, or manual drive. During the blood pressure measurement process, when the testee places their arm into the arm sleeve 9 of the blood pressure monitor, the blood pressure monitor drives the first transmission component 2 via the first drive assembly 110 to tighten the variable diameter ring 1. For example, when the first drive assembly 110 is energized, it rotates forward to pull one end of the variable diameter ring 1, causing the variable diameter ring 1 to tighten the cloth cover 11 and cover the testee's arm for measurement. At this time, the second transmission component 3 drives the second drive component 4 to lock the variable diameter ring 1, reducing the possibility of the variable diameter ring 1 becoming abnormally loose during the use of the blood pressure monitor.

[0035] After the blood pressure monitor finishes measuring, the second transmission component 3 drives the second drive component 4 to disengage from the variable diameter ring 1, and the first drive component 110 is energized and reverses, driving the variable diameter ring 1 to rotate and causing the cloth cover 11 to loosen the tester's arm. At this time, the tester can take out his arm from the arm tube 9 of the blood pressure monitor, reducing the phenomenon that the tester cannot pull his arm out of the arm tube 9 due to the first drive component 110 being de-energized.

[0036] It should be noted that the embodiments of this application do not limit the specific structure of the second driving member 4, because the main improvement of the embodiments of this application is that the first driving component 110 drives the variable diameter ring 1 to perform a tightening and loosening action, and at the same time, the second driving member 4 locks or releases the variable diameter ring 1, thereby achieving the purpose of double insurance for the variable diameter ring 1, avoiding the blood pressure monitor being unable to complete the measurement and release action when the first driving component 110 is powered off. As for the specific structure of the second driving member 4, there are various embodiments, such as the second driving member 4 including a pneumatic driving mechanism, a hydraulic driving mechanism, a manual driving mechanism, or a battery driving mechanism. These embodiments are all within the protection scope of the second driving member 4 of this application.

[0037] The blood pressure monitor of this application is described below through a preferred embodiment of the second driving component 4.

[0038] like Figures 5 to 8As shown, in one embodiment, the first transmission member 2 has a plurality of first teeth 201 on the side facing away from the variable diameter ring 1, and the first drive assembly 110 is connected to the first transmission member 2 by tooth meshing. The second drive member 4 has a plurality of second teeth 4011 on the side facing the first transmission member 2, and the second drive member 4 is connected to the first transmission member 2 by tooth meshing in the first state.

[0039] In this embodiment, both the first drive assembly 110 and the second drive member 4 are connected to the first transmission member 2 by tooth meshing. The first tooth 201 of the first transmission member 2 can cooperate with both the first drive assembly 110 and the second drive member 4, thereby simplifying the first drive assembly 110, the second drive member 4 and the first transmission member 2. Moreover, the tooth meshing connection has the advantages of structural stability, reliable operation and not easy to loosen, which can improve the working reliability and safety of the drive mechanism 100.

[0040] Specifically, the first transmission component 2 is arranged to be distributed along the circumference of the arm cylinder 9. The first drive assembly 110 can drive the first transmission component 2 to tighten or loosen the variable diameter ring 1 through tooth meshing connection. The second drive component 4 can lock the variable diameter ring 1 by meshing with the teeth of the first transmission component 2. In this way, the variable diameter ring 1 can be tightened towards the arm side during the blood pressure measurement process and can be locked to the measurement position.

[0041] like Figures 5 to 8 As shown, in one embodiment, the first drive assembly 110 includes: a first drive mechanism 5 having a rotating shaft 51; a gear shaft 6 connected to the rotating shaft 51 via a transmission belt 13, the gear shaft 6 being meshed with the first transmission member 2, the gear shaft 6 driving the first transmission member 2 to rotate during rotation, and the first transmission member 2 driving the variable diameter ring 1 to change diameter.

[0042] In this embodiment, the rotating shaft 51 of the first drive mechanism 5 is connected to the gear shaft 6 via the transmission belt 13, thereby enabling the first drive mechanism 5 to avoid the first transmission member 2 and reducing the interference between the first drive mechanism 5 and the first transmission member 2 during the movement of the first transmission member 2. Both the first transmission member 2 and the variable diameter ring 1 are configured to be distributed circumferentially. During the process of the gear shaft 6 driving the first transmission member 2, the first transmission member 2 drives the variable diameter ring 1 to tighten or loosen circumferentially, thereby achieving the purpose of changing the diameter.

[0043] Furthermore, the first airbag 10 is located at the end of the variable diameter ring 1 furthest from the connection to the first transmission member 2. The effective length of the variable diameter ring 1 changes during the diameter change process, while the effective length of the first airbag 10 does not change during the diameter change process. The effective length mentioned in the embodiments of this application refers to the length of the portions of the variable diameter ring 1 and the first airbag 10 involved in blood pressure measurement.

[0044] like Figures 5 to 8As shown, in one embodiment, the first transmission member 2 is disposed above the second driving member 4, and the gear shaft 6 is located between the first transmission member 2 and the second driving member 4 and meshes with the first transmission member 2.

[0045] In this embodiment, the arrangement of the first transmission member 2, the second driving member 4, and the gear shaft 6 can improve the structural compactness of the drive mechanism 100 and reduce the space occupied by the drive mechanism 100.

[0046] Specifically, the gear shaft 6 drives the first transmission member 2 to tighten or loosen in the circumferential direction by rotating, and the second driving member 4 achieves the purpose of locking or disengaging from the first transmission member 2 by lifting and lowering.

[0047] In addition, the second drive member 4 can either directly grip the gear shaft 6 to achieve locking during the lifting and lowering process, or it can achieve locking by cooperating with the first transmission member 2. Both of these embodiments are within the protection scope of this application.

[0048] like Figures 5 to 8 As shown, in one embodiment, the second driving member 4 includes: at least one locking part 401, the locking part 401 having a second tooth 4011 on the side facing the first transmission member 2; and a relief groove 402, provided on the side of the locking part 401 facing the tooth shaft 6, the relief groove 402 being used to avoid the tooth shaft 6 when the second driving member 4 moves.

[0049] In this embodiment, the locking part 401 and the first transmission member 2 are in gear engagement. Gear engagement has the advantages of stable structure, reliable operation, and not easy to loosen, which can improve the working reliability and safety of the drive mechanism 100.

[0050] The clearance groove 402 can avoid the gear shaft 6 during the rising process of the locking part 401, thereby reducing the interference between the locking part 401 and the gear shaft 6 during the rising process.

[0051] like Figures 5 to 8 As shown, in one embodiment, there are two locking parts 401, and a clearance groove 402 is provided between the two locking parts 401. The two locking parts 401 are arranged to be distributed along the arc-shaped trajectory of the first transmission member 2.

[0052] In this embodiment, the first transmission member 2 is configured to be distributed circumferentially. By providing two locking parts 401 and configuring the two locking parts 401 to be distributed along the arc trajectory of the first transmission member 2, the contact area between the two locking parts 401 and the first transmission member 2 can be increased. This allows the two locking parts 401 to contact the first transmission member 2 along the arc trajectory during the upward process and achieve the purpose of synchronously locking the first transmission member 2. This reduces the phenomenon of stress concentration caused by uneven local force between the two locking parts 401 and the first transmission member 2.

[0053] like Figures 5 to 8 As shown, in one embodiment, the second driving member 4 is disposed above the second transmission member 3. The second transmission member 3 includes a second airbag. When the second airbag is inflated, it pushes the second driving member 4 to rise, which is a first state. When the second airbag is deflated, the second driving member 4 descends, which is a second state.

[0054] In this embodiment, the second driving component 4 is controlled to rise and fall by inflating and deflating the second airbag. Compared with the electric drive of the second driving component 4, it has better working reliability and can reduce the phenomenon that the second driving component 4 cannot rise and fall due to power failure.

[0055] Furthermore, even if the second airbag malfunctions during the deflation process, preventing the tester's arm from being removed from the arm cylinder 9, as an emergency measure, the tester can manually open the second airbag to deflate it, thereby allowing the variable diameter ring 1 to be opened under external force. At this point, the tester can remove their arm from the arm cylinder 9.

[0056] like Figures 5 to 8 As shown, in one embodiment, the clearance groove 402 and the two locking parts 401 are configured as an integral structure, the bottom of the locking part 401 is configured as a flat surface, and the second airbag is configured to be attached to the bottom of the locking part 401 and used to drive the clearance groove 402 and the two locking parts 401 to rise and fall synchronously.

[0057] In this embodiment, by setting the clearance groove 402 and the two locking parts 401 as an integral structure, the second airbag can drive the two locking parts 401 to rise and fall synchronously, so that the two locking parts 401 can contact the first transmission member 2 at the same time during the rising process, and can achieve the purpose of synchronously locking the first transmission member 2, thereby reducing the phenomenon of stress concentration caused by uneven local force between the two locking parts 401 and the first transmission member 2.

[0058] Furthermore, the second airbag drives the clearance groove 402 and the two locking parts 401 to rise and fall synchronously. During the rising process of the two locking parts 401, the clearance groove 402 can avoid the gear shaft 6, thereby reducing the interference between the integrated structure formed by the clearance groove 402 and the two locking parts 401 and the gear shaft 6 during the rising process.

[0059] like Figures 5 to 8 As shown, in one embodiment, a cloth cover 11 is provided inside the first airbag 10, and a piezoelectric sensor 12 is provided between the cloth cover 11 and the first airbag 10. The piezoelectric sensor 12 is configured to be located at the brachial artery measurement position in the arm during the diameter change of the variable diameter ring 1.

[0060] In this embodiment, the piezoelectric sensor 12 can only move up and down and will not shift circumferentially due to the shrinking and enlarging of the variable diameter ring 1, so that the piezoelectric sensor 12 is always kept at the brachial artery measurement position in the arm to fit the brachial artery of the forearm and upper arm.

[0061] Specifically, the piezoelectric sensor 12 is moved up and down by connecting to the telescopic device installed inside the arm cylinder, so as to adapt to the scaling state of the variable diameter ring 1, so that the piezoelectric sensor 12 always fits the brachial artery measurement position of the arm during the measurement process, without the phenomenon of circumferential positional shift.

[0062] like Figures 5 to 8 As shown, in one embodiment, the drive mechanism 100 further includes a first seat 7 and a second seat 8 that are detachably connected, with an accommodating space between the first seat 7 and the second seat 8 for accommodating the first drive assembly 110, the second drive member 4, and the second transmission member 3.

[0063] In this embodiment, the accommodating space formed between the first seat 7 and the second seat 8 can not only accommodate the first drive assembly 110, the second drive member 4, and the second transmission member 3, but also protect the first drive assembly 110, the second drive member 4, and the second transmission member 3, reducing interference between the first drive assembly 110, the second drive member 4, and the second transmission member 3 and the outside world during the movement, and reducing the contamination of the first drive assembly 110, the second drive member 4, and the second transmission member 3 by external dust, water vapor, and other impurities.

[0064] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined in this application.

Claims

1. A blood pressure monitor, characterized in that: Includes boom (9), variable diameter ring (1), drive mechanism (100), first airbag (10), and controller. The variable diameter ring (1) is disposed inside the arm cylinder (9) and is used to wrap the arm under the drive of the drive mechanism (100); The drive mechanism (100) includes a first transmission member (2), a first drive assembly (110), a second transmission member (3), and a second drive member (4). One end of the first transmission member (2) is connected to one end of the variable diameter ring (1). The first drive assembly (110) meshes with the first transmission member (2) and controls the movement of the first transmission member (2) to change the diameter of the variable diameter ring (1). The second transmission member (3) is disposed below the second drive member (4) and controls the up and down movement of the second drive member (4) so ​​that the second drive member (4) and the first transmission member (2) have a first state of contact and a second state of separation. The first airbag (10) is disposed at the other end of the variable diameter ring (1) away from the connection of the first transmission member (2); The controller is used to control the first drive assembly (110) to work so that when the diameter of the variable diameter ring (1) is adapted to the arm, it controls the second transmission member (3) to work so that the second drive member (4) has the first state.

2. The blood pressure monitor according to claim 1, characterized in that, The first transmission member (2) has a plurality of first teeth (201) on the side facing away from the variable diameter ring (1), and the first drive assembly (110) is connected to the first transmission member (2) by tooth meshing. The second drive member (4) has a plurality of second teeth (4011) on the side facing the first transmission member (2), and the second drive member (4) is connected to the first transmission member (2) by tooth meshing in the first state.

3. The blood pressure monitor according to claim 2, characterized in that, The first driving component (110) includes: The first drive mechanism (5) has a rotating shaft (51); The gear shaft (6) is connected to the rotating shaft via a transmission belt (13). The gear shaft (6) is meshed with the first transmission component (2). During rotation, the gear shaft (6) drives the first transmission component (2) to rotate, and the first transmission component (2) drives the variable diameter ring (1) to change diameter.

4. The blood pressure monitor according to claim 3, characterized in that, The first transmission member (2) is located above the second driving member (4), and the gear shaft (6) is located between the first transmission member (2) and the second driving member (4) and meshes with the first transmission member (2).

5. The blood pressure monitor according to claim 4, characterized in that, The second driving element (4) includes: At least one locking part (401) is provided with a second tooth (4011) on the side of the locking part (401) facing the first transmission member (2); A clearance groove (402) is provided on the side of the locking part (401) facing the gear shaft (6), and the clearance groove (402) is used to avoid the gear shaft (6) when the second driving member (4) moves.

6. The blood pressure monitor according to claim 5, characterized in that, Two locking parts (401) are provided, and the relief groove (402) is provided between the two locking parts (401). The two locking parts (401) are arranged to be distributed along the arc-shaped trajectory of the first transmission member (2).

7. The blood pressure monitor according to claim 6, characterized in that, The second driving member (4) is located above the second transmission member (3). The second transmission member (3) includes a second airbag. When the second airbag is inflated, it pushes the second driving member (4) to rise and has the first state. When the second airbag is deflated, the second driving member (4) descends and has the second state.

8. The blood pressure monitor according to claim 7, characterized in that, The clearance groove (402) and the two locking parts (401) are configured as an integral structure. The bottom of the locking part (401) is configured as a flat surface. The second airbag is configured to be attached to the bottom of the locking part (401) and is used to drive the clearance groove (402) and the two locking parts (401) to rise and fall synchronously.

9. The blood pressure monitor according to claim 8, characterized in that, A cloth cover (11) is provided inside the first airbag (10), and a piezoelectric sensor (12) is provided between the cloth cover (11) and the first airbag (10). The piezoelectric sensor (12) is configured to be located at the brachial artery measurement position of the arm during the diameter change of the variable diameter ring (1).

10. The blood pressure monitor according to any one of claims 1-9, characterized in that, The drive mechanism (100) further includes a first seat (7) and a second seat (8) that are detachably connected, and an accommodating space is formed between the first seat (7) and the second seat (8) for accommodating the first drive assembly (110), the second drive member (4) and the second transmission member (3).

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