Wrist blood pressure monitor
The wrist blood pressure monitor addresses measurement errors by aligning the sensing cuff with the radial artery on either wrist, providing accurate readings and universal usability.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- OMRON HEALTHCARE CO LTD
- Filing Date
- 2022-06-27
- Publication Date
- 2026-05-19
AI Technical Summary
Conventional wrist blood pressure monitors face measurement errors due to the ulnar and radial arteries being compressed differently, leading to inaccurate readings and difficulty in using the device on both left and right wrists.
A wrist blood pressure monitor design with a sensing cuff and pressure cuff positioned to accurately compress the radial artery on either the left or right wrist by adjusting the band's orientation and cuff placement to align with the radial artery, regardless of hand dominance.
Enables accurate blood pressure measurement on both left and right wrists by stabilizing cuff pressure alignment with the radial artery, reducing measurement errors and ensuring consistent readings.
Smart Images
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Abstract
Description
Technical Field
[0001] The present disclosure relates to a wrist blood pressure monitor.
Background Art
[0002] As a conventional wrist blood pressure monitor, Japanese Patent Application Laid-Open No. 2006-149682 (Patent Document 1) discloses a blood pressure monitor including a device body and a cuff band coupled to the device body and wrapped around the wrist. On the side edge of the cuff band located on the fingertip side of the palm when wrapped around the wrist, a piece protruding toward the fingertip side by a predetermined distance is provided. ru obi In the wrist blood pressure monitor disclosed in Patent Document 1, by aligning the tip of the strip with the base of the wrist, the air bag provided in the cuff band can be arranged at an appropriate position.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] Here, when the circumferential surface in the circumferential direction of the wrist is defined as the surface of the arm located on the palm side, the side surface of the arm located on the thumb side, the side surface of the arm located on the little finger side, and the surface of the arm located on the back of the hand, in the wrist blood pressure monitor disclosed in Patent Document 1, when worn on the wrist, the device body is arranged to be located on the surface of the arm located on the palm side, and the air bag provided in the cuff band is also arranged to cover the surface of the arm located on the palm side. Therefore, when the air bag is inflated, two arteries, the radial artery running along the base side of the thumb and the ulnar artery running along the base side of the little finger, are compressed.
[0005] The ulnar artery runs deeper within the arm than the radial artery. Therefore, when compressing the surface of the arm on the palm side with a single cuff (air bladder), subtle differences occur in the cuff pressure at which the radial and ulnar arteries begin to collapse and at which they completely collapse. This results in a wide range of pulse wave amplitude changes, from low to high pressure, and in some individuals, two peaks may appear. This can lead to measurement errors.
[0006] To improve such measurement errors, one possible approach is to design the cuff structure to include a pressure cuff and a sensing cuff with independent air systems, and to selectively acquire the radial artery pulse wave signal using the sensing cuff.
[0007] However, as disclosed in Patent Document 1, when a wrist blood pressure monitor is attached to the wrist so that the tip of the band piece provided on one side in the width direction of the cuff band is aligned with the base of the wrist and the main body of the device is positioned on the surface of the arm on the palm side, if the sensing cuff is positioned to match the position of the radial artery of the left hand, then when the wrist blood pressure monitor is attached to the right hand, the sensing cuff will be misaligned from the radial artery of the right hand. As a result, it becomes difficult to use the wrist blood pressure monitor on both the left and right wrists.
[0008] This disclosure has been made in view of the above-mentioned problems, and the purpose of this disclosure is to provide a wrist blood pressure monitor that can be used interchangeably on the left and right wrists and can measure blood pressure with high accuracy. [Means for solving the problem]
[0009] This disclosure ofA wrist blood pressure monitor based on one example comprises a main body, a band-shaped member connected to the main body, and a pouch-shaped sensing cuff and a pressure cuff provided on the band-shaped member. The band-shaped member is configured to be wrapped around either the left or right wrist. The pressure cuff is provided so that when the band-shaped member is wrapped around the left or right wrist, the sensing cuff can be pressed toward the left or right wrist. When the band-shaped member is wrapped around the left wrist, it has a first end and a second end located in the width direction perpendicular to the circumferential direction. In a first state in which the band-shaped member is wrapped around the left wrist such that the first end is located on the finger side of the left hand, the second end is located on the elbow side of the left hand, and the main body is positioned on the side of the left arm on the thumb side of the left hand, the sensing cuff is positioned from the palm side surface of the left arm to the radius of the left wrist. motion The sensing cuff is positioned to compress the pulse. In the second state, when the band-shaped member is wrapped around the right wrist such that the second end is located on the finger side of the right hand, the first end is located on the elbow side of the right hand, and the main body is located on the side of the right arm on the thumb side of the right hand, the sensing cuff is positioned to compress the radial artery of the right wrist from the palm side of the right arm.
[0010] In a wrist blood pressure monitor based on the example of the present disclosure described above, in the first state, the sensing cuff is preferably positioned so as to compress the radial artery of the left wrist in the portion of the left arm circumference from the top of the side of the left hand on the thumb side to the flexor carpi radialis muscle. Furthermore, in the second state, the sensing cuff is preferably positioned so as to compress the radial artery of the right wrist in the portion of the right arm circumference from the top of the side of the right hand on the thumb side to the flexor carpi radialis muscle.
[0011] In a wrist blood pressure monitor based on the example of the present disclosure described above, the main body may include a display unit. In this case, the display unit preferably has one end located on the finger side of the left hand and the other end located on the elbow side of the left hand in the first state, and preferably, in the second state, the one end of the display unit is located on the elbow side of the right hand and the other end of the display unit is located on the finger side of the right hand. [Effects of the Invention]
[0012] According to this disclosure, it is possible to provide a wrist blood pressure monitor that can be used on both the left and right wrists and can measure blood pressure with high accuracy. [Brief explanation of the drawing]
[0013] [Figure 1] This is a perspective view of the external appearance of a wrist blood pressure monitor according to an embodiment. [Figure 2] This is a schematic cross-sectional view of a wrist blood pressure monitor according to an embodiment. [Figure 3] This is a perspective view showing a first state in which the wrist blood pressure monitor according to the embodiment is worn on the left wrist. [Figure 4] Figure 3 is a schematic cross-sectional view along the line IV-IV shown. [Figure 5] This is a perspective view showing a second state in which the wrist blood pressure monitor according to the embodiment is worn on the right wrist. [Figure 6] Figure 5 shows a schematic cross-sectional view along the line VI-VI. [Figure 7] This is a block diagram showing the control configuration of a wrist blood pressure monitor according to an embodiment. [Figure 8] This is a flowchart showing the measurement flow of a wrist blood pressure monitor according to an embodiment. [Modes for carrying out the invention]
[0014] The embodiments of this disclosure will be described in detail below with reference to the drawings. In the embodiments described below, the same or common parts are denoted by the same reference numerals in the drawings, and their descriptions will not be repeated.
[0015] Figure 1 is an external perspective view of the wrist blood pressure monitor according to the embodiment. Figure 2 is a schematic cross-sectional view of the wrist blood pressure monitor according to the embodiment. Figure 3 is a perspective view showing the first state in which the wrist blood pressure monitor according to the embodiment is worn on the left wrist. Note that Figure 1 is a perspective view of the wrist blood pressure monitor as seen from a direction approximately corresponding to that of Figure 3. The wrist blood pressure monitor 100 according to the embodiment will be described with reference to Figures 1 to 3.
[0016] As shown in FIGS. 1 to 3, the wrist blood pressure monitor 100 according to the embodiment includes a main body portion 10, a belt-like member 20, a sensing cuff 22, and a pressing cuff 23.
[0017] The belt-like member 20 is provided so as to be wrap-aroundable on either the left wrist or the right wrist. The belt-like member 20 has a first end portion 20a and a second end portion 20b located in the width direction (DR1 direction in FIG. 1) orthogonal to the circumferential direction in a state of being wrapped around the left wrist. When the belt-like member 20 is wrapped around the left wrist, the belt-like member 20 is wrapped such that the first end portion 20a is located on the finger side of the left hand and the second end portion 20b is located on the elbow side of the left hand.
[0018] The belt-like member 20 includes an outer cover member that is positioned on the radially outer side in the wrapped state and an inner cover member that is positioned on the radially inner side in the wrapped state and contacts the circumferential surface of the wrist.
[0019] The belt-like member 20 is formed in a bag shape by being joined (for example, sewn or welded) in a state where the outer cover member and the inner cover member are overlapped and their peripheries are covered by bias staples.
[0020] A surface fastener (not shown) is provided on the outer peripheral surface of the belt-like member 20 from one end portion 20c in the longitudinal direction (circumferential direction in the wrapped state), and a surface fastener 24 is provided on the inner peripheral surface near the other end portion 20d of the belt-like member 20 located on the opposite side to the one end portion 20c. The surface fastener on the one end portion 20c side is constituted by, for example, a hook fastener, and the surface fastener 24 on the other end portion 20d side is constituted by, for example, a loop fastener.
[0021] The belt-like member 20 is provided with a sensing cuff 22 and a pressing cuff 23. The sensing cuff 22 and the pressing cuff 23 are disposed between the outer cover member and the inner cover member constituting the belt-like member 20.
[0022] The pressure cuff 23 is provided so as to be able to press against the sensing cuff 22 toward the wrist. Specifically, the pressure cuff 23 is provided so as to cover the sensing cuff 22 from the side opposite to the side where the wrist is located when wrapped around it.
[0023] The sensing cuff 22 and the pressure cuff 23 are designed to expand and contract as fluid enters and exits. The sensing cuff 22 and the pressure cuff 23 are connected to a pump 52 (see Figure 7) housed within the housing 11. The sensing cuff 22 and the pressure cuff 23 expand when air is introduced as a fluid by the pump 52.
[0024] In the above description, the example given was that the strip-shaped member 20 is constructed in a bag-like shape by an outer cover member and an inner cover member. However, if the strip-shaped member 20 is constructed as a belt member or the like, the sensing cuff 22 and the pressing cuff 23 may be provided on the inner surface side of the strip-shaped member 20 that is located radially inward when wound up.
[0025] The main body 10 includes a housing 11 having a roughly box-like shape. The housing 11 has a first side surface 11a, a second side surface 11b, a top surface 11c, and a bottom surface 11d. Inside the housing 11, as will be described later, a circuit board equipped with various electronic components, a pump 52 (see Figure 7), and the like are housed.
[0026] The first side surface 11a is located on the side of the first end 20a of the strip-shaped member 20. The first side surface 11a connects the ends of the top surface 11c and the bottom surface 11d located on the side of the first end 20a. The second side surface 11b is located on the side of the second end 20b of the strip-shaped member 20. The second side surface 11b connects the ends of the top surface 11c and the bottom surface 11d located on the side of the second end 20b.
[0027] The top surface 11c and the bottom surface 11d are opposite each other in the vertical direction (direction DR2 in Figure 1). The top surface 11c is provided with a display unit 12 and an operation unit 13. The display unit 12 and the operation unit 13 are arranged side by side in a direction parallel to the width direction. The display unit 12 is located on the second end 20b side of the strip-shaped member 20. That is, the display unit 12 is located on the second side surface 11b side. The operation unit 13 is located on the first end 20a side of the strip-shaped member 20. That is, the operation unit 13 is located on the first side surface 11a side. The bottom surface 11d is provided with a curved portion 18 that fits the side of the arm located on the thumb side.
[0028] The display unit 12 has one end 12a and the other end 12b. One end 12a is located on the side of the first end 20a of the strip-shaped member 20, and the other end 12b is located on the side of the second end 20b of the strip-shaped member 20. That is, one end 12a is located on the side of the first side 11a, and the other end 12b is located on the side of the second side 11b.
[0029] The display unit 12 displays information related to blood pressure measurement, such as blood pressure measurement results, and other information. The display unit 12 is composed of a display device such as an organic EL display or a liquid crystal display. The operation unit 13 has, for example, a measurement switch 14 and a memory switch 15. The measurement switch 14 and the memory switch 15 are arranged side by side.
[0030] The measurement switch 14 is a button that is pressed when starting a measurement. The memory switch 15 is a button that is pressed when storing measurement values, etc., or when displaying stored measurement values, etc.
[0031] The operation unit 13 is not limited to a push-button switch; for example, it may be a pressure-sensitive (resistive) or proximity (capacitive) touch panel switch, in which case the switch will be displayed on the display unit 12. Furthermore, a macrophone (not shown) may be provided to allow the user to input a voice command to start blood pressure measurement. The operation unit 13 may also be equipped with a power switch.
[0032] Figure 4 is a schematic cross-sectional view along the line IV-IV shown in Figure 3. Referring to Figures 3 and 4, the state in which the wrist blood pressure monitor 100 is wrapped around the left wrist will be described.
[0033] As shown in Figure 3, when measuring blood pressure on the left wrist, the band-shaped member 20 is wrapped around the left wrist such that the first end 20a of the band-shaped member 20 is located on the finger side of the left hand, the second end 20b is located on the elbow side of the left hand, and the main body 10 is positioned on the side 60c (see Figure 4) of the left arm 60 on the thumb side of the left hand. The main body 10 is positioned relative to the left wrist by the curved portion 18 described above and is positioned to fit the side 60c of the left arm 60.
[0034] In this first state, where the band-shaped member 20 is wrapped around the left wrist, one end 12a of the display unit 12 is located on the finger side of the left hand, and the other end 12b of the display unit 12 is located on the elbow side of the left hand. Also, on the upper surface 11c, the display unit 12 is located on the elbow side of the left hand, and the operation unit 13 is located on the finger side of the left hand.
[0035] The user can confirm that the wrist blood pressure monitor 100 is properly attached to their left wrist by checking the positional relationship between the first end 20a and the second end 20b of the band-shaped member 20, the positional relationship between one end 12a and the other end 12b of the display unit 12, or the positional relationship between the display unit 12 and the operation unit 13.
[0036] Furthermore, as a means of confirming that the wrist blood pressure monitor 100 is properly attached to the left wrist, a mark may be provided on the part of the band-shaped member 20 located on the second end 20b side, the second side surface 11b of the housing 11, or the part of the upper surface 11c located on the second side surface 11b side to indicate that when the wrist blood pressure monitor 100 is attached to the left wrist, it is positioned on the opposite side from the finger side (elbow side).
[0037] Furthermore, a mark may be provided on the portion of the band-shaped member 20 located on the first end 20a side, the first side surface 11a of the housing 11, or the portion of the upper surface 11c located on the first side surface 11a side, to indicate that the wrist blood pressure monitor 100 is positioned on the finger side when it is attached to the left wrist.
[0038] As shown in Figure 4, the radius 61, ulna 62, radial artery 63, ulnar artery 64, flexor carpi radialis muscle 65, and palmaris longus muscle 66 run through the left arm 60 at the left wrist side. When the hand is positioned so that the left thumb points upward, the radius 61 and ulna 62 are aligned vertically, with the radius 61 positioned above the ulna 62. The radial artery 63 is located on the palm side relative to the radius 61, and the ulnar artery 64 is located on the palm side relative to the ulna 62. The flexor carpi radialis muscle 65 and palmaris longus muscle 66 are located between the radial artery 63 and the ulnar artery 64.
[0039] As described above, in the first state in which the band-shaped member 20 is wrapped around the left wrist, the sensing cuff 22 is positioned to compress the radial artery 63 of the left wrist from the palm side surface 60d of the left arm. More specifically, the sensing cuff 22 is positioned at the left wrist to compress the radial artery 63 of the left wrist in the portion of the circumferential surface of the left arm 60 from the top of the thumb-side surface 60c of the left hand to the flexor carpi radialis muscle 65. This allows the sensing cuff 22 to stably compress the radial artery 63 while reducing the influence of the radius 61 and the flexor carpi radialis muscle 65.
[0040] Figure 5 is a perspective view showing the wrist blood pressure monitor according to the embodiment worn on the right wrist. Figure 6 shows the line VI-VI shown in Figure 5. Outline This is a cross-section.
[0041] As shown in Figure 5, when measuring blood pressure on the right wrist, the band-shaped member 20 is wrapped around the right wrist such that the second end 20b of the band-shaped member 20 is located on the finger side of the right hand, the first end 20a is located on the elbow side of the right hand, and the main body 10 is positioned on the side 70c (see Figure 6) of the right arm 70 on the thumb side of the right hand. The main body 10 is positioned relative to the right wrist by the curved portion 18 described above and is positioned to fit the side 70c of the right arm 70.
[0042] In this second state, where the band-shaped member 20 is wrapped around the right wrist, one end 12a of the display unit 12 is located on the elbow side of the right hand, and the other end 12b of the display unit 12 is located on the fingers side of the right hand. Also, on the upper surface 11c, the display unit 12 is located on the fingers side of the right hand, and the operation unit 13 is located on the elbow side of the right hand.
[0043] The user can confirm that the wrist blood pressure monitor 100 is properly attached to their right wrist by checking the positional relationship between the first end 20a and the second end 20b of the band-shaped member 20, the positional relationship between one end 12a and the other end 12b of the display unit 12, or the positional relationship between the display unit 12 and the operation unit 13.
[0044] Furthermore, as a means of confirming that the wrist blood pressure monitor 100 is properly attached to the right wrist, a mark may be provided on the part of the band-shaped member 20 located on the first end 20a side, the first side surface 11a of the housing 11, or the part of the upper surface 11c located on the first side surface 11a side, indicating that when the wrist blood pressure monitor 100 is attached to the right wrist, it is positioned on the opposite side from the finger side (elbow side).
[0045] Furthermore, a mark may be provided on the portion of the band-shaped member 20 located on the second end 20b side, the second side surface 11b of the housing 11, or the portion of the upper surface 11c located on the second side surface 11b side to indicate that the wrist blood pressure monitor 100 is positioned on the finger side when it is attached to the right wrist.
[0046] As shown in Figure 6, inside the right arm 70 at the right wrist side are the radius 71, ulna 72, radial artery 73, ulnar artery 74, flexor carpi radialis muscle 75, palmaris longus muscle 7 6 The radial artery runs through the area. When the hand is positioned so that the right thumb points upward, the radius 71 and ulna 72 are aligned vertically, with the radius 71 positioned above the ulna 72. The radial artery 73 is located on the palmar side relative to the radius 71, and the ulnar artery 74 is located on the palmar side relative to the ulna 72. Flexor carpi radialis 75, palmaris longus 7 6 It is located between the radial artery 73 and the ulnar artery 74.
[0047] In the second state, where the band-shaped member 20 is wrapped around the right wrist as described above, the sensing cuff 22 is positioned to compress the radial artery 73 of the right wrist from the palm side surface 70d of the right arm. More specifically, the sensing cuff 22 is positioned at the right wrist to compress the radial artery 73 of the right wrist in the portion of the circumferential surface of the right arm 70 from the top of the thumb-side surface 70c of the right hand to the flexor carpi radialis muscle 75. This allows the sensing cuff 22 to stably compress the radial artery 73 while reducing the influence of the radius 71 and the flexor carpi radialis muscle 75.
[0048] Figure 7 is a block diagram showing the control configuration of a wrist blood pressure monitor according to an embodiment. The functional blocks of the wrist blood pressure monitor will be described with reference to Figure 7.
[0049] As shown in Figure 7, the main unit 10 includes, in addition to the display unit 12 and operation unit 13 described above, a control unit 40, an A / D conversion circuit 41, a pump drive circuit 42, a valve drive circuit 43, A / D conversion circuits 44 and 45, a memory 46, a power supply 47, a pressure sensor 51, a pump 52, an exhaust valve 53, a pressure sensor 54, an acceleration sensor 55, and a switching valve 56. These are housed within the housing 11.
[0050] The power supply 47 supplies power to each component mounted on the main unit 10. The power supply 47 is, for example, a rechargeable secondary battery.
[0051] Memory 46 non-temporarily stores various data such as programs used to control the wrist blood pressure monitor 100, setting data for configuring various functions of the wrist blood pressure monitor 100, and data on blood pressure measurement results. Memory 46 is also used as work memory when a program is executed.
[0052] The control unit 40 performs various functions according to a program for controlling the wrist blood pressure monitor 100 stored in the memory 46. The control unit 40 can perform blood pressure measurement based on the oscillometric method.
[0053] The control unit 40 drives the pump drive circuit 42 to control the operation of the pump 52. The control unit 40 also drives the valve drive circuit 43 to control the operation of the exhaust valve 53 and the switching valve 56. The pump 52, exhaust valve 53, and switching valve 56 are connected to the sensing cuff 22 and the pressure cuff 23 via piping.
[0054] Pump 52 is, for example, a piezoelectric pump. Switching valve 56 switches the connection destination of pump 52 and exhaust valve 53 to sensing cuff 22 or pressure cuff 23. Exhaust valve 53 is provided to be openable and closable, and by controlling the open / closed state of exhaust valve 53 and switching valve 56, the state in which sensing cuff 22 and pressure cuff 23 can be exhausted can be controlled.
[0055] The pressure sensor 51 (first pressure sensor) detects the pressure inside the pressing cuff 23. The pressure sensor 51 is, for example, a piezoresistive pressure sensor. The pressure data detected by the pressure sensor 51 is converted into predetermined data by the A / D conversion circuit 41 and input to the control unit 40.
[0056] The pressure sensor 54 (second pressure sensor) detects the pressure inside the sensing cuff 22. The pressure sensor 54 is, for example, a piezoresistive pressure sensor. The pressure data detected by the pressure sensor 54 is converted into predetermined data by the A / D conversion circuit 44 and input to the control unit 40.
[0057] The acceleration sensor 55 is, for example, a 3-axis acceleration sensor. The acceleration sensor 55 detects acceleration information representing acceleration in three mutually orthogonal directions. The acceleration information detected by the acceleration sensor 55 is converted into predetermined data by the A / D conversion circuit 45 and input to the control unit 40.
[0058] Acceleration information is one example of information that represents the movement of the person being measured. The control unit 40 can use acceleration information to calculate the activity level of the person being measured not only when walking, but also when doing various activities such as housework or desk work. Activity levels are indicators related to the person's activity, such as distance traveled (walking), calories burned, or amount of fat burned. The control unit 40 can also use acceleration information to estimate the person's activity before going to bed, during sleep, and after waking up. Furthermore, the control unit 40 can use acceleration information to estimate whether the person being measured is exercising or not.
[0059] Figure 8 is a flowchart showing the measurement flow of a wrist blood pressure monitor according to an embodiment. The measurement flow of the wrist blood pressure monitor will be explained with reference to Figure 8.
[0060] When the wrist blood pressure monitor 100 is attached to the left or right wrist and blood pressure measurement is started, initialization is first performed in step (S11). This initialization is performed based on the detection of a measurement instruction, such as when the measurement switch 14 is pressed. Specifically, in step (S11), the control unit 40 initializes the processing memory area of the memory 46. Also in step (S11), the control unit 40 controls the pump drive circuit 42 to turn off the pump 52, and controls the valve drive circuit 43 to adjust the switching valve 56 while opening the exhaust valve 53, thereby exhausting the air in the pressure cuff 23 and sensing cuff 22. As a result, the pressure sensors 51 and 54 are adjusted to 0 mmHg and initialized.
[0061] Next, in step (S12), the exhaust valve 53 is closed. Specifically, the control unit 40 closes the exhaust valve 53 via the valve drive circuit 43.
[0062] Next, in step (S13), the control unit 40 controls the pump drive circuit 42 to drive the pump 52. Step (S13) includes step (S131) of controlling the switching valve 56. In step (S131), first, the control unit 40 controls the valve drive circuit 43 to control the state of the switching valve 56 so that fluid can be supplied to the sensing cuff 22. This pressurizes the sensing cuff 22 by supplying air as fluid from the pump 52 to the sensing cuff 22.
[0063] At this point, the control unit 40 determines whether the fluid supplied to the sensing cuff 22 has reached the target supply amount. For example, the control unit 40 determines from the output of the pressure sensors 51 and 54 whether the pressure in the sensing cuff 22 has reached a predetermined pressure (for example, 15 mmHg), or whether the pump 52 has been running for a predetermined amount of time.
[0064] If the control unit 40 determines that the sensing cuff 22 has not reached a predetermined pressure, or that the pump 52 has not been running for a predetermined time, pressurization will continue.
[0065] When the control unit 40 determines that a predetermined pressure has been reached or that a predetermined time has elapsed, in step (S131), the control unit 40 controls the valve drive circuit 43 to control the switching valve 56 so that the amount of fluid in the sensing cuff 22 is maintained at a constant level. Specifically, the control unit 40 controls the pressing cuff 2 3 The state of the switching valve 56 is controlled so that fluid can be supplied to it. This pressurizes the pressure cuff 23 by supplying air from the pump 52 to the pressure cuff 23.
[0066] As a result, the pressure in the compression cuff 23 gradually increases. The resulting pressure causes the compression cuff 23 to press the sensing cuff 22 toward the left or right wrist, and the sensing cuff 22 compresses the radial artery. During this pressurization process, the control unit 40 detects the pressure in the sensing cuff 22 using the pressure sensor 54 and acquires a pulse wave signal as a fluctuating component.
[0067] Next, in step (S14), the control unit 40 calculates blood pressure values (systolic blood pressure SBP and diastolic blood pressure DBP) based on the acquired pulse wave signal. As a method for calculating blood pressure values, a known algorithm using the oscillometric method can be used.
[0068] At this point, the control unit 40 determines whether the blood pressure value has been measured. If the control unit 40 determines that the blood pressure value has not been measured (step (S14): NO), the process returns to step (S13) and pressurizes the pressure cuff 23, provided that the pressure of the compression cuff 23 has not reached the upper limit pressure (for example, a predetermined value of 300 mmHg for safety).
[0069] On the other hand, if the control unit 40 determines that it has been able to measure the blood pressure value (step (S14): YES), it performs step (S15). In step (S15), the control unit 40 controls the pump drive circuit 42 to stop the pump 52.
[0070] Next, in step (S16), the control unit 40 controls the valve drive circuit 43 and adjusts the switching valve 56 to open the exhaust valve 53. This discharges the fluid in the pressure cuff 23 and the sensing cuff 22. Then, in step (S17), the blood pressure measurement result is displayed on the display unit 12. Blood pressure can be measured through steps (S11) to (S17) in this manner.
[0071] As described above, in the wrist blood pressure monitor 100 according to the embodiment, when measuring blood pressure on the left wrist, the band-shaped member 20 is wrapped around the left wrist such that the first end 20a is located on the finger side of the left hand, the second end 20b is located on the elbow side of the left hand, and the main body 10 is positioned on the side of the left arm on the thumb side of the left hand. In this state, the sensing cuff 22 is positioned so as to be able to compress the radial artery 63 of the left wrist from the palm side surface 60d of the left arm 60.
[0072] Furthermore, when measuring blood pressure on the right wrist, the band-shaped member 20 is wrapped around the right wrist such that the second end 20b is located on the finger side of the right hand, the first end 20a is located on the elbow side of the right hand, and the main body 10 is positioned on the side of the right arm on the thumb side of the right hand. In this state, the sensing cuff 22 is positioned so as to be able to compress the radial artery 73 of the right wrist from the palm side surface 70d of the right arm 70.
[0073] Therefore, regardless of whether the band-shaped member 20 is wrapped around the left or right wrist, the sensing cuff 22 can compress the radial artery of either the left or right wrist. As a result, the wrist blood pressure monitor 100 can be used on both the left and right wrists, and blood pressure can be measured accurately.
[0074] [Note] As described above, this embodiment includes the following disclosures.
[0075] [Configuration 1] The main body and A strip-shaped member connected to the main body, The band-shaped member comprises a bag-shaped sensing cuff and a pressing cuff, The aforementioned band-shaped member is configured to be wrapped around either the left or right wrist. The pressing cuff is provided so that when the band-shaped member is wrapped around the left or right wrist, the sensing cuff can be pressed toward the left or right wrist. The aforementioned band-shaped member has a first end and a second end located in the width direction perpendicular to the circumferential direction when wrapped around the left wrist. In a first state in which the band-shaped member is wrapped around the left wrist such that the first end is located on the finger side of the left hand, the second end is located on the elbow side of the left hand, and the main body is positioned on the side of the left arm on the thumb side of the left hand, the sensing cuff extends from the palm side of the left arm to the radius of the left wrist. motion Positioned to allow compression of the pulse, A wrist blood pressure monitor in which, in a second state in which the band-shaped member is wrapped around the right wrist such that the second end is located on the finger side of the right hand, the first end is located on the elbow side of the right hand, and the main body is positioned on the side of the right arm on the thumb side of the right hand, the sensing cuff is positioned so as to be able to compress the radial artery of the right wrist from the palm side surface of the right arm.
[0076] [Configuration 2] In the first state described above, the sensing cuff is located on the circumference of the left arm, from the top of the thumb-side side of the left hand to the flexor carpi radialis muscle, and is located on the radius of the left wrist. motion Positioned to allow compression of the pulse, In the second state described above, the sensing cuff is positioned on the circumference of the right arm, from the top of the side of the right hand on the thumb side to the flexor carpi radialis muscle, and on the radius of the right wrist. motion A wrist blood pressure monitor as described in configuration 1, which is positioned to compress the pulse.
[0077] [Configuration 3] The main body includes a display unit, The display unit, in the first state, has one end located on the finger side of the left hand and the other end located on the elbow side of the left hand. In the second state, one end of the display unit is located on the elbow side of the right hand, and the other end of the display unit is located on the finger side of the right hand, as described in configuration 1 or 2.
[0078] The embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims, and all modifications are within the meaning and scope equivalent to the claims. [Explanation of symbols]
[0079] 10 Main body, 11 Housing, 11a First side, 11b Second side, 11c Top, 11d Bottom, 12 Display unit, 12a One end, 12b Other end, 13 Operation unit, 14 Measurement switch, 15 Memory switch, 18 Curved section, 20 Strip-shaped member, 20a First end, 20b Second end, 20c One end, 20d Other end, 22 Sensing cuff, 23 Pressure cuff, 24 Hook and loop fastener, 40 Control unit, 41 A / D conversion circuit, 42 Pump drive circuit, 43 Valve drive circuit, 44, 45 A / D conversion circuit, 46 Memory, 47 Power supply, 51 Pressure sensor, 52 Pump, 53 Exhaust valve, 54 Pressure sensor, 55 Acceleration sensor, 56 Switching valve, 60 Left arm, 60c Side, 60d Front, 61 Radius, 62 ulna, 63 radial artery, 64 ulnar artery, 65 flexor carpi radialis, 66 palmaris longus, 70 right arm, 70c lateral, 70d surface, 71 radius, 72 ulna, 73 radial artery, 74 ulnar artery, 75 flexor carpi radialis, 7 6 Palmaris longus muscle, 100 wrist blood pressure monitor.
Claims
1. The main body and A strip-shaped member connected to the main body, The band-shaped member comprises a bag-shaped sensing cuff and a pressing cuff, The aforementioned band-shaped member is configured to be wrapped around either the left or right wrist. The pressing cuff is provided so that when the band-shaped member is wrapped around the left or right wrist, the sensing cuff can be pressed toward the left or right wrist. The aforementioned band-shaped member has a first end and a second end located in the width direction perpendicular to the circumferential direction when wrapped around the left wrist, In a first state in which the band-shaped member is wrapped around the left wrist such that the first end is located on the finger side of the left hand, the second end is located on the elbow side of the left hand, and the main body is positioned on the side of the left arm on the thumb side of the left hand, the sensing cuff is positioned so as to be able to compress the radial artery of the left wrist from the palm side surface of the left arm. A wrist blood pressure monitor in which, in a second state in which the band-shaped member is wrapped around the right wrist such that the second end is located on the finger side of the right hand, the first end is located on the elbow side of the right hand, and the main body is positioned on the side of the right arm on the thumb side of the right hand, the sensing cuff is positioned so as to be able to compress the radial artery of the right wrist from the palm side surface of the right arm.
2. In the first state, the sensing cuff is positioned to compress the radial artery of the left wrist in the portion of the left arm's circumference from the top of the thumb-side surface of the left hand to the flexor carpi radialis muscle. The wrist blood pressure monitor according to claim 1, wherein in the second state, the sensing cuff is positioned to compress the radial artery of the right wrist in the portion of the circumferential surface of the right arm, from the top of the side of the right hand on the thumb side to the flexor carpi radialis muscle.
3. The main body includes a display unit, The display unit, in the first state, has one end located on the finger side of the left hand and the other end located on the elbow side of the left hand. In the second state, one end of the display unit is located on the elbow side of the right hand, and the other end of the display unit is located on the finger side of the right hand, as described in claim 1 or 2.