CN215017336U - Wrist strap type blood pressure monitoring device - Google Patents
Wrist strap type blood pressure monitoring device Download PDFInfo
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- CN215017336U CN215017336U CN202121098545.2U CN202121098545U CN215017336U CN 215017336 U CN215017336 U CN 215017336U CN 202121098545 U CN202121098545 U CN 202121098545U CN 215017336 U CN215017336 U CN 215017336U
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Abstract
The utility model relates to a wrist strap formula blood pressure monitor, include: a wearable wristband; the sensing module is embedded in the wearable wrist strap and used for monitoring vibration caused by the propagation of the heart to the periphery along arterial blood vessels and blood flow on the wrist of a detected person and converting the vibration into an electric signal; and the microprocessor is connected with the sensing module and used for extracting the pulse conduction time from the electric signal, establishing a blood pressure estimation model and monitoring the blood pressure in real time according to the blood pressure estimation model. The optical fiber sensor embedded in the wearable wrist strap is used for detecting the vibration caused by the propagation of the heart to the periphery along the artery and blood flow on the wrist strap, so that the wrist strap has high sensitivity and is anti-electromagnetic interference; the user only needs to wear the wearable wrist strap on the wrist part to realize real-time and continuous blood pressure monitoring, and the wearable wrist strap has the advantages of compact structure, small volume, convenience in carrying, simplicity and convenience in operation and the like, and can be applied to household daily blood pressure monitoring.
Description
Technical Field
The utility model relates to a blood pressure monitoring technology field, more specifically say, relate to a wrist strap formula blood pressure monitoring device.
Background
Blood Pressure (BP), which is the lateral pressure of blood flowing in a blood vessel and acts on the wall of a blood vessel per unit area, is the power for driving blood to flow in the blood vessel, thereby providing sufficient blood volume for each tissue and organ to maintain normal metabolism of the body. Blood pressure is also an important factor in diagnosing diseases, observing changes in conditions of illness, and judging therapeutic effects. If the blood pressure is too high or too low, serious consequences can be caused to the human body, such as damage to blood vessels and organs, insufficient blood supply to cerebral arteries and the like. Therefore, the effective blood pressure monitoring can feed the blood pressure value back to the user, so that the user can know the blood pressure condition of the user, and the disease can be prevented.
Most of the conventional blood pressure monitoring devices are arm-type electronic blood pressure meters, and the cuff needs to be worn on the arm of a user and needs to be inflated and deflated manually. In such a monitoring method, the blood vessel at the arm is deformed to a certain extent due to the cuff pressure, which is likely to cause low accuracy in re-measurement in a short time, and only a blood pressure value at a certain time can be obtained, so that continuous blood pressure monitoring cannot be performed. Meanwhile, the pressure generated by the cuff on the wrist of the user causes discomfort to the user, and the cuff is large in size and poor in portability.
SUMMERY OF THE UTILITY MODEL
To the technical problem, the embodiment of the utility model provides a can carry out continuous blood pressure monitoring, the volume is less, portable convenient wrist strap formula blood pressure monitoring device.
This the utility model provides a technical scheme that its technical problem adopted is:
a wristband blood pressure monitoring device comprising:
a wearable wristband;
the sensing module is embedded in the wearable wrist strap and used for monitoring vibration caused by the propagation of the heart to the periphery along arterial blood vessels and blood flow on the wrist of a detected person and converting the vibration into an electric signal;
and the microprocessor is connected with the sensing module and used for extracting the pulse conduction time from the electric signal, establishing a blood pressure estimation model and monitoring the blood pressure in real time according to the blood pressure estimation model.
Optionally, the sensing module includes two flexible films and an optical fiber sensor fixedly disposed in the two flexible films.
Optionally, the fiber sensor comprises a laser, an MxN fiber coupler connected to the laser, a sensing fiber and a reference fiber connected to two of the outputs of the MxN fiber coupler, an PxQ fiber coupler connected to the sensing fiber and the reference fiber, and three fiber detectors connected to three of the outputs of the PxQ fiber coupler; the output ends of the three optical fiber detectors are respectively connected with the microprocessor.
Optionally, the three optical fiber detectors include a first optical fiber detector, a second optical fiber detector and a third optical fiber detector, and the electrical signals include a first electrical signal detected by the first optical fiber detector, a second electrical signal detected by the second optical fiber detector and a third electrical signal detected by the third optical fiber detector.
Optionally, the laser is a single wavelength laser.
Optionally, the laser is a DFB laser or a VCSEL laser.
Optionally, the MxN fiber coupler is a 1x2 fiber coupler.
Optionally, the PxQ fiber coupler is a 2x3 fiber coupler.
Optionally, the microprocessor is located inside or outside the wearable wristband.
The utility model has the advantages that: the wrist strap type blood pressure monitoring device is realized based on the optical fiber sensor, detects the vibration caused by the propagation of the heart to the periphery along the artery and the blood flow on the wrist strap through the optical fiber sensor embedded in the wearable wrist strap, and has higher sensitivity and anti-electromagnetic interference; the user only needs to wear the wearable wrist strap on the wrist part to realize real-time and continuous blood pressure monitoring, and the wearable wrist strap has the advantages of compact structure, small volume, convenience in carrying, simplicity and convenience in operation and the like, and can be applied to household daily blood pressure monitoring.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
Fig. 1 is a schematic structural view of a wrist-worn blood pressure monitoring device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a sensing module of the wristband type blood pressure monitoring device according to the embodiment of the present invention;
fig. 3 is a flow chart of the microprocessor processing of the wrist strap type blood pressure monitoring device according to the embodiment of the present invention;
labeled as:
the wrist band 1 of the wearable type is provided with a wrist band,
a sensing module 2, a flexible film 21, a fiber sensor 22, a laser 221, an MxN fiber coupler 222, a sensing fiber 223, a reference fiber 224, an PxQ fiber coupler 225, a first fiber detector 226, a second fiber detector 227, a third fiber detector 228,
a microprocessor 3.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The technical solution of the present invention will be described clearly and completely with reference to the accompanying fig. 1 to 3 and the exemplary embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The embodiment provides a wrist strap type blood pressure monitoring device, and the structure of the embodiment refers to fig. 1. This wrist strap formula blood pressure monitoring device includes: the wearable wrist strap comprises a wearable wrist strap 1, a sensing module 2 and a microprocessor 3; the sensing module 2 is embedded in the wearable wrist strap 1 and used for monitoring vibration caused by the propagation of the heart to the periphery along arterial blood vessels and blood flow on the wrist of a detected person and converting the vibration into an electric signal; and the microprocessor 3 is connected with the sensing module 2 and is used for extracting pulse conduction time from the electric signals, establishing a blood pressure estimation model and monitoring blood pressure in real time according to the blood pressure estimation model.
The sensing module 2 comprises two flexible films 21 and an optical fiber sensor 22 fixedly arranged in the two flexible films 21.
Specifically, the fiber sensor 22 includes a laser 221, an MxN fiber coupler 222 connected to the laser 221, a sensing fiber 223 and a reference fiber 224 connected to two of the outputs of the MxN fiber coupler 222, an PxQ fiber coupler 225 connected to the sensing fiber 223 and the reference fiber 224, and three fiber detectors connected to three of the outputs of the PxQ fiber coupler 225; the output ends of the three optical fiber detectors are respectively connected with the microprocessor 3.
Further, the three fiber detectors include a first fiber detector 226, a second fiber detector 227 and a third fiber detector 228, and the electrical signals include a first electrical signal detected by the first fiber detector 226, a second electrical signal detected by the second fiber detector 227 and a third electrical signal detected by the third fiber detector 228.
The laser 221 is a single-wavelength laser; as a preferred embodiment of the present invention, the laser 221 is a DFB laser or a VCSEL laser.
The sensing fiber 223 and the reference fiber 224 can choose to adopt single mode fiber, few mode fiber, multimode fiber, etc. in order to make the fiber sensor form stable interference, in a preferred embodiment of the present invention, sensing fiber 223 and reference fiber 224 preferably adopt single mode fiber.
The MxN fiber couplers 222 and PxQ fiber couplers 225, wherein the number of ports represented by M, N, P and Q can be selected according to practical requirements, wherein M is an integer no less than 1, and N, P and Q are both integers no less than 2, but as a preferred embodiment of the present invention, the MxN fiber coupler 222 is a 1x2 fiber coupler, and the PxQ fiber coupler 225 is a 2x3 fiber coupler.
The incident light emitted from the laser 221 is divided into two parts when transmitted to the 1 × 2 fiber coupler, and transmitted along the sensing fiber and the reference fiber, respectively. When the two parts of light are transmitted to the 2 × 3 fiber coupler, the two parts of light interfere and couple, the output light intensities of the three output ends of the 2 × 3 fiber coupler are detected by the first fiber detector 226, the second fiber detector 227 and the third fiber detector 228, and are converted into electrical signals, and the light intensities of the three output signals are:
wherein, IinInput light intensity, I, of incident light from laser 2211、I2、I3The output light intensities of the first fiber detector 226, the second fiber detector 227 and the third fiber detector 228 respectively,
a, B are constant and are related to the source power of laser 221 for sensing the phase difference between fiber 223 and reference fiber 224.
When the detected person ties the wearable wristband 1 on the wrist, the sensing module 2 embedded in the wearable wristband 1 will monitor the vibration on the wrist caused by the propagation of the heart along the arterial blood vessels and the blood flow to the outer periphery, and the external vibration only acts on the sensing optical fiber 223 of the optical fiber sensor 22 and is insensitive to the reference optical fiber 224, so that the phase difference between the sensing optical fiber 223 and the reference optical fiber 224 will be changed, thereby changing the magnitude of the output light intensity.
Further, as shown in fig. 3, the processing steps of the microprocessor 3 include:
step 1: the sensing module 2 collects the vibration caused by the propagation of the heart along the artery and the blood flow to the periphery on the wrist of the examiner, converts the vibration into three paths of electric signals and inputs the three paths of electric signals into the microprocessor 3;
step 2: the pulse wave signals, namely phase information, are demodulated from the three paths of output original signals detected by the sensing module 2 by utilizing a differential-cross multiplication algorithm; specifically, the three paths of output original signals are respectively a first electrical signal, a second electrical signal and a third electrical signal detected by the first optical fiber detector 226, the second optical fiber detector 227 and the third optical fiber detector 228;
and step 3: extracting the distance between a main peak and a secondary peak in the pulse wave signal and defining the distance as Pulse Transit Time (PTT);
specifically, the pulse transit time PTT is inversely proportional to the pulse wave velocity PWV. When the artery becomes hard, the pulse wave travels fast on the artery wall, resulting in a decrease in the pulse transit time PTT value. Stiff arteries can weaken the buffering action of the arterial wall on blood flow, causing the blood pressure to rise. Therefore, blood pressure is proportional to the pulse wave velocity PWV and inversely proportional to the pulse transit time PTT. The pulse transit time PTT is calculated in the following way:
wherein, L is the distance of pulse transmission. Based on the Bramwell-Hill formula, the pulse wave velocity PWV can be expressed as:
where V is the vessel volume, dV is the change in vessel volume, ρ is the density of the blood, dP is the deviation between the systolic pressure (SBP) and the diastolic pressure (DBP) at the vessel wall in a short time, in mmHg, and is expressed as:
dP＝SBP-DBP
PWV may be measured by the elastic modulus E of the arterial wallinThickness h of the arterial wall, radius d of the artery and density ρ of the blood, namely:
the elastic modulus of the artery doubles with the increase in mean blood pressure MBP, i.e.:
Ein＝E0eα*MBP
wherein E is0The Young's modulus at blood pressure of 0 is shown, and α is a parameter related to blood vessels of the human body. The mean blood pressure MBP is calculated as follows:
the relationship between the systolic pressure SBP, the diastolic pressure DBP and the pulse transit time PTT is:
wherein, Ka、Kb、KcAnd Ya、Yb、YcIs a coefficient related to an individual, and can be obtained by calibrating and fitting a large amount of sample data obtained by the wrist-worn blood pressure device and the mature blood pressure monitor of the present inventionObtaining;
and 4, step 4: and establishing a blood pressure estimation model according to the linear relation between the blood pressure and the pulse transmission time, and monitoring the blood pressure in real time according to the model.
The microprocessor 3 is located inside or outside the wearable wrist band 1, for example, inside the wearable wrist band 1, or on the outer surface of the wearable wrist band 1, or outside the wearable wrist band 1, or in a display device connected to the wrist-worn blood pressure monitoring device, which will not be described in detail herein.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. A wrist-worn blood pressure monitoring device, comprising:
a wearable wristband;
the sensing module is embedded in the wearable wrist strap and used for monitoring vibration caused by the propagation of the heart to the periphery along arterial blood vessels and blood flow on the wrist of a detected person and converting the vibration into an electric signal;
and the microprocessor is connected with the sensing module and used for extracting the pulse conduction time from the electric signal, establishing a blood pressure estimation model and monitoring the blood pressure in real time according to the blood pressure estimation model.
2. The wristband blood pressure monitoring device of claim 1, wherein the sensing module comprises two flexible films and a fiber optic sensor secured in the two flexible films.
3. The wristband blood pressure monitoring device of claim 2 wherein the fiber optic sensor includes a laser, an MxN fiber optic coupler connected to the laser, a sensing fiber and a reference fiber connected to two of the outputs of the MxN fiber optic coupler, an PxQ fiber optic coupler connected to the sensing fiber and the reference fiber, and three fiber optic detectors connected to three of the outputs of the PxQ fiber optic coupler; the output ends of the three optical fiber detectors are respectively connected with the microprocessor, wherein M is an integer larger than or equal to 1, and N, P and Q are integers larger than or equal to 2.
4. The wristband blood pressure monitoring device of claim 3 wherein the three fiber optic detectors include a first fiber optic detector, a second fiber optic detector, and a third fiber optic detector, the electrical signals including a first electrical signal detected by the first fiber optic detector, a second electrical signal detected by the second fiber optic detector, and a third electrical signal detected by the third fiber optic detector.
5. The wrist worn blood pressure monitoring device of claim 3, wherein the laser is a single wavelength laser.
6. The wristband blood pressure monitoring device of claim 5, wherein the single wavelength laser is a DFB laser or a VCSEL laser.
7. The wristband blood pressure monitoring device of claim 3, wherein the MxN fiber optic coupler is a 1x2 fiber optic coupler.
8. The wristband blood pressure monitoring device of claim 3 wherein the PxQ fiber optic coupler is a 2x3 fiber optic coupler.
9. The wristband blood pressure monitoring device of claim 1 wherein the microprocessor is located inside or outside the wearable wristband.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121098545.2U CN215017336U (en) | 2021-05-21 | 2021-05-21 | Wrist strap type blood pressure monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121098545.2U CN215017336U (en) | 2021-05-21 | 2021-05-21 | Wrist strap type blood pressure monitoring device |
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| Publication Number | Publication Date |
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| CN215017336U true CN215017336U (en) | 2021-12-07 |
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| CN202121098545.2U Active CN215017336U (en) | 2021-05-21 | 2021-05-21 | Wrist strap type blood pressure monitoring device |
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- 2021-05-21 CN CN202121098545.2U patent/CN215017336U/en active Active
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