Pulse pressure measuring device

Abstract

To improve measurement accuracy by providing a pulse pressure measuring device that determines a blood vessel route.SOLUTION: A pulse pressure measuring device 1 includes a plurality of pressing members 11, 12, 13, 14, and a plurality of pressure sensors, and a processing unit 100. The pressing members are used for pressing measurement object parts, and each of the pressing members has position coordinates Pi(i=1,2,3...). Each of the pressure sensors is arranged to measure the pressure on the pressing members respectively so as to generate pressure measurement values Ii(i=1,2,3...) in the position coordinates Pi(i=1,2,3...). The processing unit determines a blood vessel route using the position coordinates Pi(i=1,2,3...) and the pressure measurement values Ii(i=1,2,3...).SELECTED DRAWING: Figure 1A

Description

[Technical field]

[0001] The present invention relates to a pulse pressure measuring device. [Background technology]

[0002] In traditional Chinese medicine, doctors place their fingers on the patient's wrist to apply pressure to detect changes in the pulse wave, and then integrate all the information to complete a diagnosis. However, diagnoses are made based on the doctor's personal clinical experience, and standards often vary, so there is a need for an objective, quantifiable pulse pressure measuring device. Pulse pressure measuring devices on the market do not determine the vascular pathway, and the measurement accuracy is low. Summary of the Invention [Problem to be solved by the invention]

[0003] By providing a pulse pressure measuring device that determines the blood vessel path, measurement accuracy is improved. [Means for solving the problem]

[0004] The present invention provides a pulse pressure measuring device that determines a blood vessel path and has good measurement accuracy.

[0005] According to one embodiment of the present invention, a pulse pressure measuring device is provided, which includes a base, a plurality of pressing members, a plurality of pressure sensors, and a processing unit. The pressing members are arranged in an array on the base and are used to press the measurement target site, among which the number of pressing members is at least four, and each pressing member has a position coordinate P i (i=1, 2, 3...). The pressure sensors are arranged to measure the pressure on the pressing member, and each has a position coordinate P i Pressure measurement I at (i=1,2,3...) i (i=1, 2, 3...). The processing unit is connected to the pressing member and the pressure sensor. In the blood vessel path determination stage, the processing unit generates position coordinates P i Any three of (i=1,2,3...) and the corresponding three pressure measurements Ii , I j , I k (i,j,k=1,2,3... and i≠j≠k) are used to find multiple weighted coordinates G ijk where:

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[0006] According to one embodiment of the present invention, a pulse pressure measuring device is provided, which includes a base, a plurality of pressing members, a plurality of pressure sensors, and a processing unit. The pressing members are arranged in an array on the base and are used to press the measurement target site, among which the number of pressing members is at least four, and each pressing member has a position coordinate P i (i=1, 2, 3...). The pressure sensors are arranged to measure the pressure of the pressing member, and each has a position coordinate P i Pressure measurement I at (i=1,2,3...) i (i=1, 2, 3...). The processing unit is connected to the pressing member and the pressure sensor. In the blood vessel path determination step, the processing unit defines a number of virtual circles, each of which has a position coordinate P i (i=1,2,3...) are the centers of the circles, and the pressure measurement I i The radius is defined as the inverse square root of (i=1, 2, 3...). The processing unit further defines a plurality of common inscribing lines between the virtual circles. The virtual circles are shrunk or enlarged at the same ratio until at least two common inscribing lines overlap each other, and a blood vessel path of the measurement target site is defined based on the overlapping common inscribing lines. Effect of the Invention

[0007] Based on the above, the pulse pressure measuring device according to the embodiment of the present invention obtains the blood vessel path using a plurality of pressing members and a plurality of pressure sensors. Compared with the conventional pulse pressure measuring device that does not determine the blood vessel path, the pulse pressure measuring device according to the embodiment of the present invention can measure the pulse wave at the measurement target site more accurately.

[0008] In order to make the above mentioned features and advantages of the present invention more comprehensible, embodiments accompanied with drawings are described in detail below. [Brief description of the drawings]

[0009] [Figure 1A] 1 is a schematic diagram of a pulse pressure measuring device according to an embodiment of the present invention. [Figure 1B] 1 is a block diagram of a pulse pressure measuring device according to an embodiment of the present invention. [Figure 1C] 1A-1D are diagrams illustrating the use of a pulse pressure measuring device according to an embodiment of the present invention. [Figure 2A] 1 is a schematic diagram of a pulse pressure measuring device according to an embodiment of the present invention. [Figure 2B] FIG. 2 illustrates a method for determining a blood vessel path according to an embodiment of the present invention. [Figure 3A] FIG. 11 is a diagram showing a blood vessel path determination method according to a second embodiment of the present invention. [Figure 3B] FIG. 11 is a diagram showing a blood vessel path determination method according to a second embodiment of the present invention. [Figure 3C] FIG. 11 is a diagram showing a blood vessel path determination method according to a second embodiment of the present invention. [Figure 3D] FIG. 11 is a diagram showing a blood vessel path determination method according to a second embodiment of the present invention. [Figure 3E] FIG. 11 is a diagram showing a blood vessel path determination method according to a second embodiment of the present invention. [Figure 4] 1 is a schematic diagram of a pulse pressure measuring device according to an embodiment of the present invention. [Diagram 5] FIG. 1 illustrates a pulse wave optimization method according to an embodiment of the present invention. [Figure 6A] 1 is a schematic diagram of a pulse pressure measuring device according to an embodiment of the present invention. [Figure 6B]1 is a schematic diagram of a pulse pressure measuring device according to an embodiment of the present invention. [Figure 7A] 1 is a schematic diagram of a pulse pressure measuring device according to an embodiment of the present invention. [Figure 7B] 1 is a schematic diagram of a pulse pressure measuring device according to an embodiment of the present invention. [Figure 7C] 1 is a schematic diagram of a pulse pressure measuring device according to an embodiment of the present invention. [Figure 8] 1 is a schematic diagram of a pulse pressure measuring device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 1A to 1C, according to an embodiment of the present invention, a pulse pressure measuring device 1 is provided, which includes a base 10, a plurality of pressing members 11, 12, 13, and 14 arranged in an array on the base 10, a plurality of pressure sensors 21, 22, 23, and 24 housed inside the base 10, and a processing unit 100. The pressing members 11, 12, 13, and 14 are used to press a measurement target site. In some embodiments, the pulse pressure measuring device 1 may be attached to a hand by a fixing member 30 as shown in FIG. 1C, and the measurement target site is, but is not limited to, a wrist. The pressure sensors 21, 22, 23, and 24 are used to measure the pressure on the pressing members 11, 12, 13, and 14, respectively. The processing unit 100 is connected to the pressing members 11, 12, 13, 14 and the pressure sensors 21, 22, 23, 24, thereby controlling the pressing members 11, 12, 13, 14 to execute a pressing process and reading the measurement data of the pressure sensors 21, 22, 23, 24. For ease of understanding, the number of pressing members 11, 12, 13, 14 and pressure sensors 21, 22, 23, 24 is four in the embodiments shown in Figs. 1A to 1C, but the present invention is not limited thereto. In each embodiment of the present invention, the number of pressing members and pressure sensors may be four or more.

[0011] Continuing, referring simultaneously to FIG. 1A, FIG. 1B, FIG. 2A and FIG. 2B, a method for determining a vascular path according to an embodiment of the present invention is provided.

[0012] In the first embodiment, the pressing members 11, 12, 13, and 14 are respectively disposed at different position coordinates P1(x,y), P2(x,y), P3(x,y), and P4(x,y) on the base 10. In the blood vessel path determination stage, the pressure sensors 21, 22, 23, and 24 measure pressure measurements I1, I2, I3, and I4, respectively, by the pressing members 11, 12, 13, and 14 performing a pressing process, where the pressure measurements I1, I2, I3, and I4 correspond to the position coordinates P1(x,y), P2(x,y), P3(x,y), and P4(x,y), respectively.

[0013] Then, based on the principle that the strength of the sensing signal decreases as the distance between the signal source and the sensor increases, the processing unit 100 uses any three of the position coordinates P1(x,y), P2(x,y), P3(x,y), and P4(x,y) and the corresponding three of the pressure measurements I1, I2, I3, and I4 to generate a plurality of weighted coordinates G as shown below: 123 (x,y), G 124 (x,y), G 134 (x,y), G 234 (x,y), where P1, P2, P3, and P4 represent P1(x,y), P2(x,y), P3(x,y), and P4(x,y), respectively:

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[0014] Then, the processing unit 100 calculates the weighted coordinates G 123 (x,y), G 124 (x,y), G 134 (x,y), G 234 A number of linear equations passing through (x, y) are defined. These linear equations are the straight lines L1 to L6 as shown in FIG. 2B. Among them, the straight line L1 is the weighted coordinate G 123 (x,y) and G 124 (x,y) and the line L2 passes through the weighted coordinate G 134 (x,y) and G 234 (x,y) and the line L3 passes through the weighted coordinate G 124 (x,y) and G 134 (x,y) and the line L4 passes through the weighted coordinate G123 (x,y) and G 234 (x,y) and the line L5 passes through the weighted coordinate G 123 (x,y) and G 134 (x,y) and the line L6 passes through the weighted coordinate G 124 (x,y) and G 234 Passes through (x,y).

[0015] Furthermore, the direction of the blood vessel path of the measurement target site is reasonably estimated based on the mounting direction of the pulse pressure measuring device 1, and the processing unit 100 defines a belt-like section by straight lines L1 to L6 having a gradient within the range of ±0.5 with respect to the reference line BS (for example, the straight lines L1, L2, L3, and L4 shown in FIG. 2B), where the reference line BS is the symmetric central axis of the pulse pressure measuring device 1 (see FIG. 2A) and defines a line with a gradient of 0. Specifically, as shown in FIG. 2B, the straight lines L1 and L2 define a belt-like section B1. It should be noted that the straight lines L5 and L6 define another belt-like section as shown in FIG. 2B, but considering the mounting direction of the pulse pressure measuring device 1, it is reasonably estimated that the blood vessel path of the measurement target site is not within the belt-like section defined by the straight lines L5 and L6, and therefore the gradient of the straight line used to define the belt-like section is limited as described above.

[0016] Next, the processing unit 100 calculates the weighted coordinate G 123 (x,y), G 124 (x,y), G 134 (x,y), G 234 Calculate the barycentric coordinate G5(x,y) of (x,y), where the x coordinate of the barycentric coordinate G5(x,y) is the sum of all weighted coordinates G 123 (x,y), G 124 (x,y), G 134 (x,y), G 234 The average value of the x coordinates of (x,y) and the y coordinate of the center of gravity coordinate G5(x,y) are all weighted coordinates G 123 (x,y), G 124 (x,y), G 134 (x,y), G 234 The average value of the y coordinate of (x,y).

[0017] Then, the processing unit 100 determines the blood vessel path BL of the measurement target site by defining the average value of the slope rate of each of the straight lines L1 and L2 that define the strip section B1 and the center of gravity coordinate G5 (x, y), in which the slope rate of the blood vessel path BL is the average value of the slope rate of each of the straight lines L1 and L2, and the blood vessel path BL passes through the center of gravity coordinate G5 (x, y). It should be particularly noted that the blood vessel path BL does not refer to the real blood vessel path in the measurement target site, but is a path on a plane that corresponds to the real blood vessel path and on which the pressing members 11, 12, 13, and 14 exist. Compared with the conventional pulse pressure measuring device that does not determine the blood vessel path, the pulse pressure measuring device 1 provided by the embodiment of the present invention can more accurately measure the pulse wave of the measurement target site based on the blood vessel path BL obtained using the pressing members 11, 12, 13, and 14 and the pressure sensors 21, 22, 23, and 24.

[0018] In some embodiments, in order to improve the accuracy of the above-mentioned blood vessel path determination step and reduce noise interference, the interval between the pressing members 11, 12, 13, and 14 in the direction parallel to the reference line BS is 30 mm or less, and the interval between them in the direction perpendicular to the reference line BS is also 30 mm or less. This prevents the intensity of the pulse pressure from being attenuated or the measurement accuracy from being affected by noise interference due to a long transmission distance.

[0019] In some embodiments, in the above-mentioned vascular path determination stage, each of the above-mentioned multiple pressing members 11, 12, 13, and 14 simultaneously presses the measurement target area to generate a pulse pressure with a relatively high intensity, thereby improving the measurement accuracy of the pulse pressure measuring device 1.

[0020] Continuing, referring simultaneously to FIG. 1A, FIG. 1B, FIG. 3A, FIG. 3B, FIG. 3C, FIG. 3D and FIG. 3E, another vascular path determining method is provided according to the second embodiment of the present invention.

[0021] In the second embodiment, the pressing members 11, 12, 13, and 14 are respectively disposed at different position coordinates P1(x,y), P2(x,y), P3(x,y), and P4(x,y) on the base 10. In the blood vessel path determination stage, the pressure sensors 21, 22, 23, and 24 measure pressure measurements I1, I2, I3, and I4, respectively, by the pressing members 11, 12, 13, and 14 performing a pressing process, where the pressure measurements I1, I2, I3, and I4 correspond to the position coordinates P1(x,y), P2(x,y), P3(x,y), and P4(x,y), respectively.

[0022] Next, based on the principle that the intensity of the sensing signal is inversely proportional to the square of the distance between the signal source and the sensor, it can be seen that the distance between the signal source and the sensor is inversely proportional to the square root of the intensity of the sensing signal. Furthermore, based on the mounting direction of the pulse pressure measuring device 1, the pressing members 11 and 13 correspond to the same pulse wave source, and the pressing members 12 and 14 correspond to the same pulse wave source. The distances between the pressing members 11 and 13 and the pulse wave sources respectively have a proportional relationship 1 / (I1) 1 / 2 :1 / (I3) 1 / 2 and the distance between each of the pressing members 12, 14 and the pulse wave source has a proportional relationship 1 / (I2) 1 / 2 :1 / (I4) 1 / 2 Based on this, the processing unit 100 calculates a circle with a center at the position coordinate P1(x,y) and a radius of 1 / (I1) as shown in FIG. 1 / 2 Define a virtual circle R1 with the position coordinate P3(x,y) as the center of the circle and the radius of the circle is 1 / (I3) 1 / 2 Define a virtual circle R3, and define a common instangent line L between the virtual circle R1 and the virtual circle R3. 13 and the common inscribed line L 31 Similarly, the processing unit 100 defines a circle having a center at the position coordinate P2(x, y) and a radius of 1 / (I2) as shown in FIG. 1 / 2 Define a virtual circle R2 with the position coordinate P4(x,y) as the center of the circle and the radius of the circle is 1 / (I4) 1 / 2 Define a virtual circle R4, and define a common instangent line L between the virtual circle R2 and the virtual circle R4. 24 and the common inscribed line L 42 Define the common instangent line L 13 and the common inscribed line L31 corresponds to the same pulse wave source, and the common inscribing line L 24 and the common inscribed line L 42 correspond to the same pulse wave source.

[0023] Then, with reference to FIGS. 3A to 3D, the processing unit 100 simultaneously expands (or reduces) the imaginary circles R1, R2, R3, and R4 at the same ratio until the common inscribing lines corresponding to the different pulse wave sources overlap each other.

[0024] Specifically, as shown in FIG. 3D, the common inscribed line L 13 (and the common inscribed line L 31 ) and the common inscribed line L 42 and overlap each other, where the common inscribing line L 13 (and the common inscribed line L 31 ) and the common inscribed line L 42 corresponds to a different pulse wave source. In this case, the radius of the virtual circle R1 is 1 / (I1) 1 / 2 C1 times (i.e., C1 / (I1) 1 / 2 ) and the radius of the imaginary circle R2 is 1 / (I2) 1 / 2 C1 times (i.e., C1 / (I2) 1 / 2 ), and the radius of the imaginary circle R3 is 1 / (I3) 1 / 2 C1 times (i.e., C1 / (I3) 1 / 2 ), and the radius of the imaginary circle R4 is 1 / (I4) 1 / 2 C1 times (i.e., C1 / (I4) 1 / 2 ), where the multiple C1 is any number greater than 0.

[0025] Finally, the processing unit 100 defines the straight line defined by the overlapping common inscribing lines as the blood vessel path BL, as shown in Figures 3D and 3E. It should be particularly noted that the blood vessel path BL does not refer to the real blood vessel path in the measurement target site, but is a path on a plane that corresponds to the real blood vessel path and on which the pressing members 11, 12, 13, and 14 are present. Compared with conventional pulse pressure measuring devices that do not determine the blood vessel path, the pulse pressure measuring device 1 provided by the embodiment of the present invention can more accurately measure the pulse wave of the measurement target site based on the blood vessel path BL obtained using the pressing members 11, 12, 13, and 14 and the pressure sensors 21, 22, 23, and 24.

[0026] In some embodiments, in order to improve the accuracy of the above-mentioned blood vessel path determination step and reduce noise interference, the interval between the pressing members 11, 12, 13, 14 in one direction is 30 mm or less, and the interval between them in another direction perpendicular to the above direction is also 30 mm or less, thereby avoiding a long transmission distance causing attenuation of the intensity of the pulse pressure or noise interference, resulting in a decrease in measurement accuracy.

[0027] In some embodiments, in the above-mentioned vascular path determination stage, each of the above-mentioned multiple pressing members 11, 12, 13, and 14 presses the measurement target area simultaneously to generate a pulse pressure with a relatively high intensity, thereby improving the measurement accuracy of the pulse pressure measuring device 1.

[0028] 4 and 5, when the pulse pressure measuring device 1 is attached to the measurement target part, the processing unit 100 defines a plurality of virtual lines A1, A2, A3 based on a built-in database or a user's setting, and points P1, P2, P3 where the virtual lines A1, A2, A3 and the blood vessel path BL intersect with each other may be set as points corresponding to a plurality of pulse wave sources in the measurement target part. In some embodiments, the measurement target part is the wrist, and the virtual lines A1, A2, A3 are three parallel lines spaced 1.0 cm to 1.2 cm apart from each other corresponding to the three pulse wave sources of the wrist, but are not limited thereto. In some embodiments, the measurement target part is another part of the human body, and the number of virtual lines is not limited to three, and the distance between the plurality of virtual lines is not limited. In the pulse wave measuring step of the pulse pressure measuring device 1, the processing unit 100 determines which pressing member and corresponding pressure sensor should be used to measure the pulse wave of a specific pulse wave source based on the positions of the pressing members 11, 12, 13, 14 and the positions of the points P1, P2, P3.

[0029] In one embodiment, the processing unit 100 performs a pulse wave measurement on the pulse wave source corresponding to point P3 using the pressing member 12 and the pressure sensor 22 to obtain the upper pulse wave diagram in Fig. 5, whose amplitude is I0. The processing unit 100 also multiplies I0 by a multiple C2 to obtain the true amplitude of the pulse wave generated by the pulse wave source, where the multiple C2 is the square root of the ratio of the shortest distance between the pressing member 12 and the blood vessel path BL to the multiple C1.

[0030] In other embodiments where a different pressing member and pressure sensor are used to perform pulse wave measurement, the true amplitude can be obtained based on the measured amplitude in a manner similar to that described above. For example, if the processing unit 100 selects the pressing member 14 and the pressure sensor 24 to perform pulse wave measurement on the pulse wave source corresponding to point P2 to obtain a pulse wave diagram with an amplitude of I0 in the upper part of Fig. 5, the processing unit 100 may multiply I0 by a multiple C2 to obtain the true amplitude of the pulse wave generated by the pulse wave source, where the multiple C2 is the square root of the ratio of the shortest distance between the pressing member 14 and the blood vessel path BL to the multiple C1, and other cases can be inferred by this analogy.

[0031] 6A and 6B, in some embodiments, the pulse pressure measuring device 1 may include two pressing members PE1, two pressing members PE2, and two pressing members PE3, and the above-mentioned six pressing members PE1, PE2, and PE3 may be arranged in a staggered manner as shown in FIG. 6A, or may be arranged in a line as shown in FIG. 6B. By arranging a relatively large number of pressure sensors, the measurement accuracy of the pulse pressure measuring device 1 can be improved. In the pulse wave measuring stage of the pulse pressure measuring device 1, the paired two pressing members PE1, the paired two pressing members PE2, or the paired two pressing members PE3 may simultaneously perform a pressing process with the same pressure value.

[0032] 7A, 7B, and 7C, in some embodiments, the pulse pressure measuring device 1 may include nine pressing members PE, and the above-mentioned nine pressing members PE may be irregularly arranged as shown in Fig. 7A, aligned as shown in Fig. 7B, or staggered in a regular arrangement as shown in Fig. 7C. In the pulse wave measuring stage of the pulse pressure measuring device 1, the multiple pressing members PE may simultaneously perform a pressing process at the same pressure value.

[0033] 8, in some embodiments, the pulse pressure measuring device 1 may include a base 10P, and a plurality of pressing members PE of the pulse pressure measuring device 1 are disposed on a curved surface of the base 10P. The pulse pressure measuring device 1 may further include a display screen 10D to display pulse pressure data.

[0034] In summary, the pulse pressure measuring device according to the embodiment of the present invention obtains the blood vessel path using multiple pressing members and multiple pressure sensors. Compared with the conventional pulse pressure measuring device that does not determine the blood vessel path, the pulse pressure measuring device according to the embodiment of the present invention can measure the pulse wave at the measurement target site more accurately. [Industrial Applicability]

[0035] The pulse pressure measuring device provided by the embodiment of the present invention can be applied to medical diagnosis. [Explanation of symbols]

[0036] 1: Pulse pressure measuring device 10, 10P: Base 10D: Display screen 11, 12, 13, 14, PE, PE1, PE2, PE3: Pressing members 21, 22, 23, 24: Pressure sensors 30: Fixing member 100: Processing unit A1, A2, A3: Virtual lines BI: Band section BL: Vascular pathway BS: Baseline G 123 (x,y), G124 (x, y), G 134 (x, y), G 234 (x, y): Load coordinates G5(x, y): Center of gravity coordinates I0: Amplitude L1 to L6: Straight lines P1, P2, P3: Points R1, R2, R3, R4: Virtual circles L 13 , L 31 , L 24 , L 42 : Common inscribed line

Claims

1. With the base, The number of the at least four, each of which has a position coordinate P ｉ A plurality of pressing members, each having i=1, 2, 3, . . . The pressure sensor 100 is arranged to measure the pressure on each of the plurality of pressing members, and thereby to determine the position coordinates P ｉ Pressure measurement value I (i = 1, 2, 3...) ｉ A plurality of pressure sensors generating (i=1, 2, 3...) a processing unit connected to the plurality of pressing members and the plurality of pressure sensors; Including, In the blood vessel path determination step, the processing unit ｉ (i=1, 2, 3, . . .) and the corresponding three pressure measurement values ​​I ｉ , I ｊ , I ｋ (i, j, k = 1, 2, 3, ... and i ≠ j ≠ k) are used to calculate multiple weighted coordinates G ｉｊｋ where: [0030] and The processing units each calculate the weighted coordinates G ｉｊｋ A plurality of linear equations passing through the weighted coordinates G are defined, and the weighted coordinates G are calculated based on the weighted coordinates G. ｉｊｋ and determining a blood vessel path of the measurement target portion based on the center of gravity coordinates of the measurement target portion. Pulse pressure measuring device.

2. In the blood vessel path determination step, each of the plurality of pressing members presses the measurement target site simultaneously.

2. The pulse pressure measuring device according to claim 1.

3. The spacing between the plurality of pressing members in a first direction and the spacing between the plurality of pressing members in a second direction perpendicular to the first direction are 30 millimeters or less.

2. The pulse pressure measuring device according to claim 1.

4. the belt-shaped section is defined by a plurality of linear equations having a slope rate within a range of ±0.5 with respect to a reference line among the plurality of linear equations, and the blood vessel path of the measurement target site corresponds to the belt-shaped section; 2. The pulse pressure measuring device according to claim 1.

5. The weighted coordinates G ｉｊｋ and determining the blood vessel path of the measurement target portion based on the center of gravity coordinates of the plurality of linear equations that define the strip section, and an average slope rate of the plurality of slope rates of the plurality of linear equations that define the strip section.

5. The pulse pressure measuring device according to claim 4.

6. With the base, The number of the at least four is at least four, and each of the at least four has a position coordinate P ｉ A plurality of pressing members, each having i=1, 2, 3, . . . By measuring the pressure on each of the pressing members, the position coordinates P ｉ Pressure measurement value I (i = 1, 2, 3...) ｉ A plurality of pressure sensors generating (i=1, 2, 3...) a processing unit connected to the plurality of pressing members and the plurality of pressure sensors; Including, In the blood vessel path determination step, the processing unit defines a plurality of virtual circles, where each of the plurality of virtual circles is defined by the plurality of position coordinates P ｉ (i=1, 2, 3, . . .) are the centers of the circles, and the pressure measurement values ​​I ｉ The radius is the inverse square root of (i=1, 2, 3...), and The processing unit further defines a plurality of common inscribing lines between the plurality of virtual circles, shrinks or expands the plurality of virtual circles at the same ratio until at least two of the common inscribing lines overlap with each other, and defines a blood vessel path of the measurement target site based on the plurality of common inscribing lines that overlap with each other. Pulse pressure measuring device.

7. The plurality of overlapping common inscribed lines defining the vascular path of the measurement target site are arranged to define at least four position coordinates P ｉ (i = 1, 2, 3...) 7. The pulse pressure measuring device according to claim 6.

8. The plurality of overlapping common inscribed lines defining the vascular path correspond to different pulse wave sources.

7. The pulse pressure measuring device according to claim 6.

9. In the blood vessel path determination step, each of the plurality of pressing members simultaneously presses the measurement target site.

7. The pulse pressure measuring device according to claim 6.

10. The spacing between the plurality of pressing members in a first direction and in a second direction perpendicular to the first direction is 30 millimeters or less.

7. The pulse pressure measuring device according to claim 6.

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