Sphygmomanometer

Abstract

The invention 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] The present invention relates to the technical field of medical devices, and in particular to a sphygmomanometer. Background Art

[0002] A sphygmomanometer is a commonly used instrument for detecting blood pressure. The sphygmomanometers commonly used in daily life are mostly cuff-type sphygmomanometers. Cuff-type sphygmomanometers measure blood pressure by manually wrapping a cuff around the arm. Elderly people react slowly when operating it, and it is difficult to manually wrap the cuff around the arm with one hand. There are also problems such as different tightness and position of the binding, which will cause inaccurate measurement results.

[0003] In order to solve the problem of difficulty in wrapping the cuff of a blood pressure monitor around the arm, and the measurement distortion caused by different binding tightness and different positions, the prior art has proposed an automatic blood pressure monitor, in which the arm band is tightened by the pulling force of a motor. The motor is powered on and rotates forward to pull one end of the arm band, and the arm band is tightly covered on the upper arm of the tester for measurement. After the measurement is completed, the motor is powered on and reversed to drive the arm band to rotate, and the tester takes out his arm.

[0004] However, the automatic sphygmomanometer completely relies on the forward and reverse rotation of the motor to achieve the purpose of loosening or tightening the armband. If the sphygmomanometer is powered off during use, the sphygmomanometer will not be able to loosen or tighten the armband. Summary of the invention

[0005] In view of this, the present invention provides a sphygmomanometer to solve the problem that the armband of the existing sphygmomanometer cannot be loosened or tightened if a power outage occurs during use.

[0006] In the first aspect, the present invention provides a blood pressure monitor, comprising: an arm tube, a reducing ring, a driving mechanism, a first airbag and a controller, wherein the reducing ring is arranged in the arm tube and is used to wrap the arm under the drive of the driving mechanism; the driving mechanism comprises a first transmission member, a first driving assembly, a second transmission member and a second driving member, one end of the first transmission member is connected to one end of the reducing ring, the first driving assembly is engaged with the first transmission member and controls the movement of the first transmission member to thereby change the diameter of the reducing ring, the second transmission member is arranged below the second driving member and controls the up and down movement of the second driving member so that the second driving member and the first transmission member have a first state of abutment and a second state of separation; the first airbag is arranged at the other end of the reducing ring away from the first transmission member; the controller is used to control the first driving assembly to work, so as to drive the diameter of the reducing ring to adapt to the arm, and control the second transmission member to work, so as to drive the second driving member to have a first state.

[0007] Beneficial effect: The sphygmomanometer drives the reducing ring to change its diameter through the first driving component, so as to achieve the purpose of loosening or tightening the reducing ring, and at the same time locks and loosens the reducing ring through the second driving component. In this way, even if the first driving component is powered off, it will not affect the locking and loosening of the reducing ring by the second driving component, so that the sphygmomanometer can complete the locking and loosening actions even when an abnormality occurs in the first driving component, thereby improving the working reliability and safety of the sphygmomanometer.

[0008] In an optional embodiment, a first transmission member is provided with a plurality of first teeth on a side facing away from the reducing ring, the first drive assembly is connected to the first transmission member by tooth meshing, a second drive member is provided with a plurality of second teeth on a 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 an 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 being meshingly connected to the first transmission member, the gear shaft drives the first transmission member to rotate during rotation, and the first transmission member drives the reducing ring to change diameter.

[0010] In an optional embodiment, the first transmission member is arranged 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 an optional embodiment, the second driving member includes: at least one locking portion, a second tooth is provided on the side of the locking portion facing the first transmission member; a clearance groove is provided on the side of the locking portion facing the gear shaft, and the clearance groove is used to avoid the gear shaft when the second driving member moves.

[0012] In an optional embodiment, two locking parts are provided, a clearance groove is provided between the two locking parts, and the two locking parts are arranged to be distributed along the arc track of the first transmission member.

[0013] In an optional embodiment, the second driving member is arranged 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 and has a first state. When the second airbag is deflated, the second driving member descends and has a second state.

[0014] In an optional embodiment, the give way groove and the two locking parts are arranged as an integrated structure, the bottom of the locking part is arranged as a plane, the second airbag is arranged to be attached to the bottom of the locking part, and is used to drive the give way groove and the two locking parts to rise and fall synchronously.

[0015] In an optional embodiment, a cloth cover is provided inside the first airbag, a piezoelectric sensor is provided between the cloth cover and the first airbag, and the piezoelectric sensor is configured to be able to always be located at the brachial artery measurement position of the arm during the diameter change process of the diameter reducing ring.

[0016] In an optional embodiment, the driving mechanism further includes a first seat and a second seat that are detachably connected, and an accommodating space is formed between the first seat and the second seat for accommodating the first driving assembly, the second driving member and the second transmission member. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the disassembled structure of a sphygmomanometer according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A front view of the sphygmomanometer is shown;

[0020] Figure 3 for Figure 2 An axonometric view of the sphygmomanometer shown;

[0021] Figure 4 for Figure 2 A schematic diagram of a partial structure of a sphygmomanometer is shown;

[0022] Figure 5 is a schematic structural diagram of a driving mechanism according to an embodiment of the present invention;

[0023] Figure 6 A schematic diagram of a portion of the structure of a driving mechanism according to an embodiment of the present invention;

[0024] Figure 7 is a schematic structural diagram of a second driving member according to an embodiment of the present invention;

[0025] Figure 8 Schematic diagram of the structure of the first transmission member according to an embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. reducing ring; 2. first transmission member; 201. first tooth; 3. second transmission member; 4. second driving member; 401. locking portion; 4011. second tooth; 402. clearance groove; 5. first driving mechanism; 51. rotating shaft; 6. gear shaft; 7. first seat; 8. second seat; 9. arm tube; 10. first airbag; 11. cloth cover; 12. piezoelectric sensor; 13. transmission belt; 100. driving mechanism; 110. first driving assembly. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0029] In order to solve the problem that the blood pressure monitor in the prior art cannot loosen the arm band after power failure, the relevant technology proposes to use a turbine reduction motor with a self-locking function as the power source for the blood pressure monitor. When the arm band is rolled up, the turbine reduction motor will self-lock after power failure to ensure that the arm band does not rebound during the measurement process of the blood pressure monitor, thereby ensuring the measurement accuracy of the blood pressure monitor. However, if there is a sudden power failure during the measurement process, the arm band cannot be loosened due to the self-locking function of the motor, and the tester's arm cannot be pulled out of the blood pressure monitor, resulting in blood circulation in the tester's arm, posing a great safety hazard.

[0030] In order to enable the blood pressure monitor to achieve the purpose of self-locking the reducing ring and loosening the reducing ring during power failure, the embodiment of the present application proposes to drive the diameter change of the reducing ring through a first driving component, and simultaneously lock and loosen the reducing ring through a second driving component. In this way, even if the first driving component is powered off, it will not affect the locking and loosening of the reducing ring by the second driving component, thereby improving the working reliability and safety of the blood pressure monitor.

[0031] Combine the following Figures 1 to 8 , describing an embodiment of the present invention.

[0032] like Figures 1 to 5 As shown, according to an embodiment of the present invention, on the one hand, a sphygmomanometer is provided, including an arm tube 9, a reducing ring 1, a driving mechanism 100, a first airbag 10 and a controller. The reducing ring 1 is arranged in the arm tube 9, and is used to wrap the arm under the drive of the driving mechanism 100; the driving mechanism 100 includes a first transmission member 2, a first driving assembly 110, a second transmission member 3 and a second driving member 4, one end of the first transmission member 2 is connected to one end of the reducing ring 1, the first driving assembly 110 is engaged with the first transmission member 2 and controls the movement of the first transmission member 2 to thereby change the diameter of the reducing ring 1, the second transmission member 3 is arranged below the second driving member 4 and controls the up and down movement of the second driving member 4, so that the second driving member 4 and the first transmission member 2 have a first state of abutment and a second state of separation; the first airbag 10 is arranged at the other end of the reducing ring 1 away from the first transmission member 2; the controller is used to control the first driving assembly 110 to work, so as to drive the diameter of the reducing ring 1 to adapt to the arm, and control the second transmission member 3 to work, so as to drive the second driving member 4 to have a first state.

[0033] In this embodiment, the sphygmomanometer drives the reducing ring 1 to change its diameter through the first driving component 110, so as to achieve the purpose of loosening or tightening the reducing ring 1, and at the same time locks and loosens the reducing ring 1 through the second driving component 4. In this way, even if the first driving component 110 is powered off, it will not affect the locking and loosening of the reducing ring 1 by the second driving component 4, so that the sphygmomanometer can complete the measurement and loosening actions even when the first driving component 110 has an abnormality, thereby improving the working reliability and safety of the sphygmomanometer.

[0034] Specifically, the first drive assembly 110 includes a motor assembly, and the second drive member 4 includes a pneumatic drive, a hydraulic drive, or a manual drive. In the process of measuring the blood pressure of the tester with the sphygmomanometer, after the tester puts his arm into the arm tube 9 of the sphygmomanometer, the sphygmomanometer drives the first transmission member 2 through the first drive assembly 110 to drive the reducer 1 to tighten. For example, after the first drive assembly 110 is powered on, it rotates forward to pull one end of the reducer 1, and the reducer 1 drives the cloth cover 11 to tighten and then cover the tester's arm for measurement. At this time, the second transmission member 3 drives the second drive member 4 to lock the reducer 1 to reduce the abnormal loosening of the reducer 1 during the use of the sphygmomanometer.

[0035] After the sphygmomanometer has completed the measurement, the second transmission member 3 drives the second driving member 4 to disengage from the reducing ring 1, and the first driving component 110 is energized and reversed, driving the reducing ring 1 to rotate and drive the cloth cover 11 to loosen the test subject's arm. At this time, the test subject can take out his arm from the arm tube 9 of the sphygmomanometer, reducing the phenomenon that the test subject cannot pull out his arm from the arm tube 9 due to power failure of the first driving component 110.

[0036] It should be noted that the embodiments of the present application do not limit the specific structure of the second drive member 4 because the main improvement of the embodiments of the present application is to drive the reducer 1 to loosen or tighten by the first drive component 110, and at the same time, lock or loosen the reducer 1 by the second drive component 4, so as to achieve the purpose of double insurance for the reducer 1, and avoid the blood pressure monitor being unable to complete the measurement and loosening action when the first drive component 110 is powered off. As for the specific structure of the second drive member 4, it includes a variety of embodiments. For example, the second drive member 4 includes a pneumatic drive mechanism, a hydraulic drive mechanism, a manual drive mechanism or a battery drive mechanism. These embodiments all belong to the protection scope of the second drive member 4 of the present application.

[0037] The sphygmomanometer of the present application is described below through a preferred embodiment of the second driving member 4 .

[0038] like Figures 5 to 8As shown, in one embodiment, a first transmission member 2 is provided with a plurality of first teeth 201 on the side facing away from the reducer ring 1, the first drive assembly 110 is connected to the first transmission member 2 by tooth meshing, a second drive member 4 is provided with 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, the first drive component 110 and the second drive member 4 are both connected to the first transmission member 2 by tooth engagement. The first tooth 201 of the first transmission member 2 can cooperate with both the first drive component 110 and the second drive member 4, thereby achieving the purpose of simplifying the first drive component 110, the second drive member 4 and the first transmission member 2. Moreover, the tooth engagement connection 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.

[0040] Specifically, the first transmission member 2 is arranged to be distributed along the circumference of the arm tube 9, and the first driving assembly 110 can drive the first transmission member 2 to tighten or loosen the reducing ring 1 through a tooth engagement connection, and the second driving member 4 can lock the reducing ring 1 by the first transmission member 2 through tooth engagement with the first transmission member 2, so that the reducing ring 1 can be tightened toward the arm side during the measurement process of the sphygmomanometer, 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 through a transmission belt 13, the gear shaft 6 is meshingly connected with the first transmission member 2, and the gear shaft 6 drives the first transmission member 2 to rotate during rotation, and the first transmission member 2 drives the reducing ring 1 to change its diameter.

[0042] In this embodiment, the rotating shaft 51 of the first driving mechanism 5 is connected to the gear shaft 6 through the transmission belt 13, so that the first driving mechanism 5 can avoid the first transmission member 2, thereby reducing the interference between the first driving mechanism 5 and the first transmission member 2 during the movement of the first transmission member 2. The first transmission member 2 and the reducing ring 1 are both arranged to be distributed along the circumferential direction. In the process of the gear shaft 6 driving the first transmission member 2, the first transmission member 2 drives the reducing ring 1 to tighten or loosen along the circumferential direction, so as to achieve the purpose of changing the diameter.

[0043] In addition, the first airbag 10 is arranged at the other end of the reducing ring 1 away from the first transmission member 2, and the effective length of the reducing ring 1 will change during the reducing process, while the effective length of the first airbag 10 will not change during the reducing process. The effective length described in the embodiment of the present application refers to the length of the part of the reducing 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 first transmission member 2 , the second driving member 4 and the gear shaft 6 are arranged in this way, so as to improve the structural compactness of the driving mechanism 100 and reduce the occupied space of the driving mechanism 100 .

[0046] Specifically, the gear shaft 6 drives the first transmission member 2 to tighten or loosen along 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, during the lifting process, the second driving member 4 can directly hold the gear shaft 6 to achieve the locking purpose, and can also achieve the locking purpose by cooperating with the first transmission member 2. Both embodiments belong to 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 portion 401, and a second tooth 4011 is provided on the side of the locking portion 401 facing the first transmission member 2; a clearance groove 402 is provided on the side of the locking portion 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.

[0049] In this embodiment, the locking portion 401 and the first transmission member 2 are tooth-matched, and the tooth-matching has the advantages of stable structure, reliable operation, and not easy to loosen, which can improve the working reliability and safety of the driving 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, two locking parts 401 are provided, a clearance groove 402 is provided between the two locking parts 401 , and the two locking parts 401 are arranged to be distributed along the arc track of the first transmission member 2 .

[0052] In this embodiment, the first transmission member 2 is arranged to be distributed along the circumferential direction. By arranging two locking parts 401 and arranging the two locking parts 401 to be distributed along the arc trajectory of the first transmission member 2, the matching area between the two locking parts 401 and the first transmission member 2 can be increased, so that the two locking parts 401 can contact the first transmission member 2 along the arc trajectory 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 local uneven 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 arranged above the second transmission member 3, and 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 a first state. When the second airbag is deflated, the second driving member 4 descends and has a second state.

[0054] In this embodiment, the embodiment of the present application achieves the purpose of controlling the lifting and lowering of the second drive member 4 by inflating and deflating the second airbag. Compared with the electrically driven lifting and lowering of the second drive member 4, it has better working reliability and can reduce the phenomenon that the second drive member 4 cannot be lifted and lowered due to power failure.

[0055] Furthermore, even if the second airbag fails during the deflation process and the tester's arm cannot be removed from the arm tube 9, as an emergency measure, the tester can also manually open the second airbag to achieve the purpose of deflation, so that the reducing ring 1 can be expanded under the action of external force. At this time, the tester can take his arm out of the arm tube 9.

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

[0057] In this embodiment, by setting the yield groove 402 and the two locking parts 401 as an integrated 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 local uneven 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, and the clearance groove 402 can avoid the gear shaft 6 during the rising process of the two locking parts 401, thereby reducing the interference between the one-piece 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 able to always be located at the brachial artery measurement position of the arm during the diameter change process of the diameter reducing ring 1.

[0060] In this embodiment, the piezoelectric sensor 12 can only move up and down and will not be circumferentially offset due to the reduction and expansion of the reducing ring 1, so that the piezoelectric sensor 12 always remains in the brachial artery measurement position of the arm to fit the brachial artery of the upper and lower arms.

[0061] Specifically, the piezoelectric sensor 12 is moved up and down by connecting the upper and lower telescopic devices installed in the arm tube to adapt to the scaling state of the reducer 1, so that the piezoelectric sensor 12 always fits the brachial artery measurement position of the arm during the measurement process without circumferential position deviation.

[0062] like Figures 5 to 8 As shown, in one embodiment, the driving 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 driving assembly 110 , the second driving member 4 and the second transmission member 3 .

[0063] In the present embodiment, the accommodating space formed between the first seat 7 and the second seat 8 can not only accommodate the first drive component 110, the second drive member 4 and the second transmission member 3, but also protect the first drive component 110, the second drive member 4 and the second transmission member 3, reduce the interference between the first drive component 110, the second drive member 4 and the second transmission member 3 and the outside world during the movement, and reduce the pollution of the first drive component 110, the second drive member 4 and the second transmission member 3 by external impurities such as dust and water vapor.

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

Claims

1. A sphygmomanometer, characterized in that: It comprises an arm tube (9), a reducing ring (1), a driving mechanism (100), a first air bag (10) and a controller. The reducing ring (1) is arranged in the arm tube (9) and is used to wrap the arm part under the drive of the driving mechanism (100); The driving mechanism (100) comprises a first transmission member (2), a first driving assembly (110), a second transmission member (3) and a second driving member (4); one end of the first transmission member (2) is connected to one end of the reducing ring (1); the first driving assembly (110) is meshed with the first transmission member (2) and controls the movement of the first transmission member (2) to thereby change the diameter of the reducing ring (1); the second transmission member (3) is arranged below the second driving member (4) and controls the up and down movement of the second driving member (4) so ​​that the second driving member (4) and the first transmission member (2) have a first state of abutment and a second state of separation; The first airbag (10) is arranged at the other end of the reducing ring (1) away from the first transmission member (2); The controller is used to control the first driving component (110) to operate so as to drive the diameter of the reducing ring (1) to adapt to the arm portion, and to control the second transmission member (3) to operate so as to drive the second driving member (4) to have the first state.

2. The sphygmomanometer according to claim 1, characterized in that: The first transmission member (2) is provided with a plurality of first teeth (201) on a side facing away from the reducer (1); the first drive assembly (110) is connected to the first transmission member (2) in a toothed meshing manner; the second drive member (4) is provided with a plurality of second teeth (4011) on a side facing the first transmission member (2); the second drive member (4) is connected to the first transmission member (2) in a toothed meshing manner in the first state.

3. The sphygmomanometer according to claim 2, characterized in that: The first driving assembly (110) comprises: A first driving mechanism (5) having a rotating shaft (51); The gear shaft (6) is connected to the rotating shaft via a transmission belt (13), and the gear shaft (6) is meshingly connected with the first transmission member (2). During the rotation process, the gear shaft (6) drives the first transmission member (2) to rotate, and the first transmission member (2) drives the diameter-changing ring (1) to change its diameter.

4. The sphygmomanometer according to claim 3, characterized in that: The first transmission member (2) is arranged 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 sphygmomanometer according to claim 4, characterized in that: The second driving member (4) comprises: at least one locking portion (401), the second teeth (4011) being provided on a side of the locking portion (401) facing the first transmission member (2); A clearance groove (402) is provided on a side of the locking portion (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 sphygmomanometer according to claim 5, characterized in that: Two locking parts (401) are provided, and the clearance groove (402) is provided between the two locking parts (401). The two locking parts (401) are arranged to be distributed along the arc track of the first transmission member (2).

7. The sphygmomanometer according to claim 6, characterized in that: The second driving member (4) is arranged above the second transmission member (3), and 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 sphygmomanometer according to claim 7, characterized in that: The giving way groove (402) and the two locking parts (401) are arranged as an integrated structure, the bottom of the locking part (401) is arranged as a plane, and the second airbag is arranged to be attached to the bottom of the locking part (401) and is used to drive the giving way groove (402) and the two locking parts (401) to rise and fall synchronously.

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

10. The sphygmomanometer according to any one of claims 1 to 9, characterized in that: The driving mechanism (100) further comprises a first seat (7) and a second seat (8) which are detachably connected, and an accommodation space is formed between the first seat (7) and the second seat (8) for accommodating the first driving assembly (110), the second driving member (4) and the second transmission member (3).

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