Three-channel Pulse Wave Signal Sensing Strap and Non-invasive Pulse Wave Blood Pressure Measuring Device

Abstract

A three-channel pulse wave signal sensing strap, which is divided into an upstream signal channel, a midstream signal channel and a downstream signal channel according to the blood flow direction. The upstream signal channel is a strap body with an internal inflatable airbag or attached with an electronic signal sensor. The midstream signal channel is a strap body with an internal inflatable airbag. The downstream signal channel is a strap body with an internal inflatable airbag or attached with an electronic signal sensor. Among them, the inflatable airbag in the midstream signal channel can block arterial blood flow when inflated. The internal inflatable airbags of the upstream, midstream and downstream signal channels are respectively docked with three corresponding connection sockets of the main body of the non-invasive blood pressure measurement device through air ducts. The electronic signal sensors of the upstream signal channel and the downstream signal channel are respectively docked with two corresponding connection sockets of the main body of the non-invasive blood pressure measurement device through signal connecting wires. The range of the interval distance between the edge of the upstream signal channel and the edge of the midstream signal channel is 0 to 20 centimeters. It can accurately measure the central arterial pressure and the intraluminal large artery pressure.

Description

Technical Field

[0001] The present invention relates to a blood pressure measurement strap and a non-invasive blood pressure measurement device. Background Art

[0002] Non-invasive blood pressure measurement is the most commonly used blood pressure examination method in medical clinics. The existing non-invasive blood pressure measurement uses a single-airbag strap, which has varying degrees of error. In order to improve the accuracy of non-invasive blood pressure measurement, it is necessary to detect blood flow pulses under different conditions. Among various detection methods, the airbag sensor is a relatively common detection method. The applicant of the present invention applied for an invention patent "A Double-Airbag Strap" on April 16, 2012, with the patent number ZL201220159276.0, and the inventor is Wu Xiaoguang, the first inventor of this application. A double-airbag strap is disclosed in this invention patent. According to the double-airbag solution, the brachial artery blood pressure can be accurately measured.

[0003] The 2003 ESH / ESC Guidelines for the Management of Hypertension pointed out that there is a difference between central artery pressure and brachial artery pressure. Compared with the brachial artery blood pressure measurement often used in daily clinical practice, central artery blood pressure has a closer relationship with organs such as the heart, brain, and kidneys and their complications, and has an independent and stronger predictive value for cardiovascular diseases and related complications. Central artery pressure refers to the lateral pressure borne by the blood vessels at the root of the ascending aorta. Theoretically, central artery pressure is more closely related to target organ damage and cardiovascular diseases, and its predictive value for cardiovascular events is better than that of peripheral brachial artery pressure, which has been confirmed in some clinical trials. Research shows that central artery pressure (aortic pressure) has better clinical predictive value than peripheral artery pressure (brachial artery pressure). Therefore, it is of great significance to measure central artery blood pressure.

[0004] Non-invasive central artery blood pressure measurement is a currently widely used and easily implemented measurement method. Currently, the commonly used non-invasive central artery blood pressure measurement devices mainly obtain the central artery pressure through non-invasive methods such as plane pulse wave analysis of the carotid artery and radial artery or dilation wave analysis of the carotid artery, including: ① Substitution method: using the carotid artery pressure wave to approximately substitute the ascending aorta pressure wave, but it cannot be directly measured with a sphygmomanometer; ② Visual method: analyzing the ascending aorta pressure by visually observing the change in the late systolic waveform of the radial artery pressure wave, which belongs to semi-quantification; ③ Synthesis method: synthesizing the ascending aorta pressure from the radial artery pressure wave, that is, using an arterial pulse wave analyzer to non-invasively record the radial artery pulse wave through a touch pressure probe and converting it into a central artery pulse wave by computer processing. However, all of the above three methods have the defect of relatively large measurement errors. The main idea of non-invasive measurement of central artery pressure is as follows: First step, measure the brachial artery blood pressure; second step, collect the pulse waveform of the carotid artery or radial artery; third step, calculate the central artery pressure from the data obtained in the above two steps. There are three possible errors here. First, the collected pulse wave is not the central artery pulse wave and needs to be converted and processed, and there are inevitable errors in this process. Second, due to problems with the measurement method, there are relatively large errors in the brachial artery blood pressure used as the calculation basis. Third, the position where the brachial artery blood pressure is measured is not the same as the position where the pulse wave is collected, so the collected pulse wave does not represent the pulse wave at the brachial artery position. Therefore, the central artery pressure calculated therefrom will inevitably have errors. Summary of the Invention

[0005] One object of the present invention is to provide a three-channel pulse wave signal sensing strap for accurately measuring blood pressure, especially central artery blood pressure and other large artery pressures in the cavity.

[0006] In addition, the present invention also provides a non-invasive blood pressure measurement device for pulse waves for accurately measuring blood pressure, especially central artery blood pressure and other large artery pressures in the cavity.

[0007] The technical problems of the present invention are solved by the following technical solutions.

[0008] In this application, an electronic signal sensor refers to an electric sensor other than an inflatable airbag for converting the pulse wave signal of the channel to be measured into an electronic signal, including but not limited to a pressure sensor and an optoelectronic sensor.

[0009] Central arterial pressure refers to the lateral pressure borne by the blood vessels at the root of the ascending aorta. From the human body structure, it is known that the left subclavian artery in the human body originates from the ascending aorta, continues to the axillary artery, and then continues to the brachial artery, forming a continuous arterial pipeline. Although there are several different arterial branches emerging at other positions in this continuous arterial pipeline, most of them are relatively small arterial blood vessels. One of the relatively large branches is the left vertebrobasilar artery, which is connected to the upper wall of the starting segment of the left subclavian artery. Therefore, when the brachial artery in the left arm is blocked and the blood pressure measurement position in the left arm is at the same horizontal level as the ascending aorta, the pressure felt at the blood pressure measurement position in the left arm is equivalent to the pressure at the connection between the upper wall of the starting segment of the left subclavian artery and the left vertebrobasilar artery. At the same time, since the inner diameter of the first segment of the left subclavian artery is relatively thick and the length is relatively short, the blood flow velocity at this position is not very fast. Therefore, when there is no serious blockage in the first segment of the left subclavian artery, the flow resistance in this segment is not large, and the formed pressure difference is not significant. Thus, we can conclude that when the brachial artery in the left arm is blocked and the blood pressure measurement position in the left arm is at the same horizontal level as the ascending aorta, the blood pressure at the blood pressure measurement position in the left arm is equivalent to the pressure at the connection between one end of the left subclavian artery and the ascending aorta. According to the definition, this pressure is the central arterial pressure.

[0010] When there is a serious blockage in the first segment of the left subclavian artery, the right arm can be used for measurement. The right subclavian artery originates from the brachiocephalic trunk. When the brachial artery in the right arm is blocked and the blood pressure measurement position in the right arm is at the same horizontal level as the ascending aorta, the blood pressure at the blood pressure measurement position in the right arm is equivalent to the pressure at the connection between one end of the right subclavian artery and the brachiocephalic trunk. This pressure is close to the central arterial pressure, but there will be a certain measurement error. Although the central arterial pressure measured through the right arm has a certain error relatively speaking, in fact, the blood pressure measured through the right arm is the innominate artery pressure, which is just very close to the central arterial pressure.

[0011] In addition to the central arterial pressure, other large arterial pressures in the cavity also include the innominate artery pressure and the end of the abdominal aorta mentioned above. Here, the cavity refers to the abdominal cavity or the thoracic cavity. What is actually measured through the right arm is the blood pressure of the innominate artery, and what is measured through the lower limbs is the blood pressure at the end of the abdominal aorta. The technology of the present invention can not only measure the central arterial pressure, but also measure other large arterial pressures in the cavity. Blood pressure can be measured not only through the upper limbs, but also through the lower limbs.

[0012] In order to accurately measure central arterial pressure and other intraluminal large artery pressures. First, the collected pulse wave can be made as close as possible to the central artery or other intraluminal large artery waveforms. Blood flow and vascular elasticity are the main factors affecting the acquisition of pulse waveforms. Therefore, when acquiring the waveforms of central arterial pressure or other intraluminal large artery pressures, the acquisition position can be as close as possible to the ascending aorta or other intraluminal large arteries, and at the same time, arterial blood flow should be blocked. Secondly, the position for acquiring the pulse waveform can be as close as possible to the position for measuring brachial artery blood pressure or femoral artery blood pressure, etc.

[0013] A three-channel pulse wave signal sensing strap according to the present invention is divided into three signal channels: upstream, middle, and downstream in the blood flow direction. It includes a strap body, upstream and downstream pulse wave signal sensors, an internal middle airbag, signal connecting wires for connecting a non-invasive blood pressure measuring device, air ducts, etc. The interval distances of the three channels of upstream, middle, and downstream are designed according to the length of the limb of the measured person. According to the usage requirements, the three channels can be closely connected to form a whole, or can be fixedly connected at an interval. The interval distance between the upstream and middle signal channels can be between 0 and 25 cm, preferably between 0 and 15 cm, such as 1, 2, 5, 10 cm, etc.; the interval distance between the middle and downstream signal channels can be between 0 and 30 cm.

[0014] The middle signal channel is an inflatable airbag, which can block arterial blood flow when inflated. The width of the airbag in the middle signal channel is the same as that of the airbag in the traditional Korotkoff sound method, and the minimum width is determined according to the limb circumference of the measured person. The upstream and downstream signal channels are pressure or optoelectronic sensors, and can also be designed as inflatable airbags.

[0015] The upstream and downstream signal channels can be strap bodies with internal inflatable airbags. The upstream airbag strap body is fixedly connected to the middle airbag strap body, the middle airbag strap body is fixedly connected to the downstream airbag strap body, and the upstream, middle, and downstream airbag strap bodies are fixedly installed on the same bracket. When in use, it is bound to the same measured limb, and during the use process, the relative positions of the upstream, middle, and downstream channels remain fixed.

[0016] One or both of the upstream and downstream signal channels can be strap bodies with internal pressure or optoelectronic sensors. The upstream strap body with internal pressure or optoelectronic sensor is fixedly connected to the middle airbag strap body, the middle airbag strap body is fixedly connected to the downstream strap body with internal pressure or optoelectronic sensor, and the upstream, middle, and downstream strap bodies are fixedly installed on the same bracket.

[0017] The air ducts of the upstream airbag strap body, the air ducts of the middle airbag strap body, and the air ducts of the downstream airbag strap body are respectively docked with three corresponding connection sockets of the non-invasive blood pressure measuring device.

[0018] When measuring the central arterial pressure and other large artery pressures in the cavity using a three-channel pulse wave signal sensing strap, the process is as follows.

[0019] Step 1: Fix the three-channel pulse signal sensing strap on the limb to be measured in the order of upstream, middle, and downstream according to the blood flow direction.

[0020] Step 2: Inflate the middle airbag so that the blood flow in the brachial artery is in a completely blocked state. At this time, the pulse wave signal collected by the upstream channel is very close to the central arterial pressure waveform.

[0021] Step 3: Gradually deflate the middle airbag until it is deflated to the ambient pressure. During this process, synchronously collect the pulse wave signals of the middle and downstream channels to obtain the systolic and diastolic blood pressures of the brachial artery. For the calculation method of determining the brachial artery blood pressure using the amplitude and time delay of the pulse wave signals of the middle and downstream channels, please refer to the invention patent "A Non-invasive Blood Pressure Measuring Device" with the patent number ZL201010247968.6, and its inventor is Wu Xiaoguang, the first inventor of this application.

[0022] Step 4: Based on the pulse wave signals of the upstream and downstream signal channels, the gas pressure signal of the middle airbag, and the diastolic blood pressure value of the brachial artery synchronously collected in the above process, calculate the systolic and diastolic blood pressure values of the central artery, and the measurement is completed.

[0023] Therefore, the three-channel pulse wave signal sensing strap of the present invention has the following characteristics:

[0024] Characteristic 1: Adopt a middle blocking airbag and inflate the airbag pressure far greater than the systolic blood pressure of the arterial blood. At this time, the arterial blood vessel is in a completely blocked state, and the blood in the blood vessel hardly flows, eliminating the influence on the measurement of the central arterial pressure caused by blood flow. Therefore, the blood pressure that the middle blocker can sense is approximately equal to the central arterial pressure.

[0025] Characteristic 2: Adopt a middle blocking airbag and install a downstream pulse wave detector at the downstream position in the arterial blood flow direction of the blocking airbag. After inflating the blocking airbag to block the arterial blood flow and then gradually deflating it, collect the starting point moment of the output signal of the downstream pulse wave detector when the blocking airbag just enters the semi-blocked state, and the corresponding airbag pressure value of the blocking airbag. When the width of the blocking airbag is sufficient, the airbag pressure value corresponding to this starting point moment is approximately equal to the blood pressure in the arterial blood vessel at this moment.

[0026] Characteristic 3: Install an upstream pulse wave detector at the upstream position in the arterial blood flow direction of the blocking airbag. At the starting point moment of the output signal of the downstream pulse wave detector, the blood flow velocity in the arterial blood vessel is close to zero, and the blood pressure in the arterial blood vessel at the position of the upstream pulse wave detector is equal to the blood pressure in the arterial blood vessel at the position of the blocking airbag.

[0027] Feature 4: Take the second derivative of the air pressure fluctuation curve when the midstream blocking airbag just enters the semi-blocking state, find the first zero-crossing point that changes from positive to negative, that is, the zero-crossing point of blood flow acceleration, and measure the delay time from the starting point of the pulse wave to the zero-crossing point of acceleration; for the semi-blocking state and the full-blocking state, for the pulse wave signals of a certain cardiac cycle in the two states, starting from the starting point of the pulse wave, find the above-mentioned delay time points respectively. The arterial blood vessel pressure at the upstream pulse wave detection positions corresponding to these two time points is approximately equal.

[0028] Feature 5: The tightness of the upstream pulse detector installed on the limb remains unchanged during the measurement process; or when the upstream pulse wave detector is an inflatable airbag, the inflation pressure remains unchanged during the measurement process. Thus, the output signal intensity of the upstream pulse detector is proportional to the blood pressure in the blood vessel at the upstream position.

[0029] Feature 6: Collect the signal curve of the upstream pulse wave detector in the fully blocked state and the arterial blood vessel pressure at the zero-crossing point of acceleration at the upstream pulse wave detection position, and calculate the maximum value of the arterial blood vessel pressure at the upstream pulse wave detection position. This is approximately equal to the central arterial systolic pressure.

[0030] Next, the widths and positions of the three signal channels of the three-channel pulse wave signal sensing strap will be described.

[0031] I. Determination of the widths and positions of the upper, middle, and lower airbag straps.

[0032] 1. The width of the midstream airbag strap is determined by the upper limb circumference of the measured person, that is, the upper limb perimeter. The corresponding relationship between the width and the upper limb circumference of the measured person is the same as the requirement for the cuff of the Korotkoff sound method sphygmomanometer. When the upper limb circumference of the measured person is large, the width of the midstream airbag strap is correspondingly increased. When the upper limb circumference of the measured person is small, the width of the midstream airbag strap is correspondingly decreased.

[0033] 2. The widths of the upper and lower airbag straps should not be too narrow or too wide. If the widths of the upper and lower airbag straps are too narrow, the output pressure signal will be too small, affecting the measurement accuracy. If the widths of the upper and lower airbag straps are too wide, the time resolution accuracy will become poor. At the same time, due to the limitation of the upper limb length of the measured person, the widths of the upper and lower airbag straps cannot be too wide.

[0034] Generally, the width range of the upper and lower airbag straps is 1 - 5 cm; preferably, it is 2 - 3 cm. At this range, both the measurement accuracy and the time resolution accuracy are appropriate.

[0035] 3. To ensure measurement accuracy, the upstream airbag strap should be as close as possible to the part of the limb near the body. The upper edge of the middle-stream airbag strap should be as close as possible to the lower edge of the upstream airbag strap, and it is best not to be completely connected, otherwise it is easy to cause mutual interference between the upstream and middle-stream airbag straps.

[0036] During actual measurement, if the length of the upper limb permits, the upper, middle, and downstream airbag straps can be placed on the upper limb above the elbow joint at the same time, or the upstream and middle-stream airbag straps can be placed on the upper limb above the elbow joint, and the downstream airbag strap can be placed below the elbow joint.

[0037] When measuring the lower limb, the downstream airbag strap can be bound below the knee joint.

[0038] Second, in the case of using an electronic signal sensor, such as a pressure sensor or a photoelectric sensor, in the upstream and / or downstream signal channels, a strap bracket can be used to fix the upstream and downstream pressure sensors or photoelectric sensors, as well as the middle-stream airbag strap. The distances and positions of the upstream, middle-stream, and downstream are determined by the strap bracket. The center position of the upstream electronic signal sensor can be spaced from the upper edge of the middle-stream airbag by a distance between 0 and 15 cm, typically 1 cm. The center position of the downstream electronic signal sensor can be spaced from the lower edge of the middle-stream airbag by a distance between 0 and 30 cm, typically 1 cm.

[0039] There are fixing straps on the strap bracket for fixing the upstream and downstream sensors. During actual measurement applications, the fixing straps of the upstream and downstream electronic signal sensors should be of appropriate tightness so that the upstream and downstream electronic signal sensors can be fixed on the surface of the artery of the measured limb, making them immovable, while not affecting blood flow.

[0040] Similar to the sensing strap with three airbags, the upstream electronic signal sensor of the sensing strap with an electronic signal sensor in the upstream signal channel should be as close as possible to the part of the limb near the body. The upper edge of the middle-stream airbag strap should be as close as possible to the lower edge of the upstream electronic signal sensor, and it is best not to be completely connected, otherwise it is easy to cause mutual interference between the upstream and middle-stream signal channels.

[0041] During actual measurement, if the length of the upper limb permits, the upper, middle, and downstream signal channels can be placed on the upper limb above the elbow joint at the same time, or the upstream and middle-stream signal channels can be placed on the upper limb above the elbow joint, and the downstream signal channel can be placed below the elbow joint, or even placed at the wrist artery.

[0042] When measuring the lower limb, the downstream electronic signal sensor can be placed below the knee joint.

[0043] In the three-channel pulse wave signal sensing strap of the present invention, at least the middle signal channel adopts an inflatable airbag, and the inflatable airbag is fixed by the strap. The upstream and middle signal channels do not necessarily need to be fixed by the strap. It is only necessary to be able to fix the upstream and downstream electronic signal sensors on the body surface of the artery of the measured limb so that they cannot move and at the same time do not affect blood flow. In other words, the upstream, middle, and downstream signal channels can be integrated or separated; moreover, even if they are integrated, they can be spaced at a certain distance in the main body part and are only connected by a connecting structure, such as a bracket, a connecting strip, etc.

[0044] Therefore, the present invention provides a three-channel pulse wave signal sensing strap, characterized in that: corresponding to the measured limb, the three-channel pulse wave signal sensing strap is divided into an upstream signal channel, a middle signal channel, and a downstream signal channel according to the blood flow direction. When measuring blood pressure, the upstream signal channel, the middle signal channel, and the downstream signal channel are respectively fixed at the upstream, middle, and downstream in the blood flow direction. The upstream signal channel is a strap body with an internal inflatable airbag or an upstream electronic signal sensor. The middle signal channel is the middle strap of the strap body including an internal inflatable airbag. The downstream signal channel is a strap body with an internal inflatable airbag or a downstream electronic signal sensor. Among them, the inflatable airbag in the middle signal channel can block arterial blood flow when inflated; the internal inflatable airbags of the upstream signal channel, the internal inflatable airbag of the middle signal channel, and the internal inflatable airbag of the downstream signal channel are respectively docked with the host of the non-invasive blood pressure measurement device through air ducts to transmit blood vessel pressure signals; the upstream electronic signal sensor and the downstream electronic signal sensor respectively transmit the pulse wave signals of the upstream and downstream of the blood flow to the host of the non-invasive blood pressure measurement device; and the interval distance range between the edge of the upstream signal channel and the edge of the middle signal channel is 0 to 25 centimeters.

[0045] As a preferred mode, the interval distance between the upstream signal channel, the middle signal channel, and the downstream signal channel is designed according to the length of the measured person's limb. The three signal channels can be tightly connected to form a whole through a connecting structure or can be spaced at a distance.

[0046] As a preferred mode, the interval distance between the edge of the upstream signal channel and the edge of the middle signal channel is 1 centimeter; the interval distance range between the edge of the middle signal channel and the edge of the downstream signal channel is 1 centimeter.

[0047] As a preferred mode, when measuring the upper limb, the inflatable airbag of the downstream signal channel can be bound at a position below the elbow joint; and when measuring the lower limb, the inflatable airbag of the downstream signal channel can be bound at a position below the knee joint.

[0048] As a preferred mode, the upstream signal channel, the middle - stream signal channel and the downstream signal channel should be bound to the same limb to be measured, and during use, the relative positions of the upstream signal channel, the middle - stream signal channel and the downstream signal channel remain fixed.

[0049] As a preferred mode, when at least one of the upstream signal channel and the downstream signal channel is an electronic signal sensor, the electronic signal sensor is a pressure sensor or a photoelectric sensor.

[0050] As a preferred mode, when the upstream signal channel, the middle - stream signal channel and the downstream signal channel are all strap bodies with built - in inflatable air bags, the strap body of the upstream signal channel is fixedly connected to the strap body of the middle - stream signal channel, the strap body of the middle - stream signal channel is fixedly connected to the strap body of the downstream signal channel, and the strap bodies of the upstream signal channel, the middle - stream signal channel and the downstream signal channel are fixedly installed as the same strap body.

[0051] As a preferred mode, when at least one of the upstream signal channel and the downstream signal channel is an electronic signal sensor, a strap bracket is used to fix the electronic signal sensor of the upstream signal channel and / or the downstream signal channel and the middle - stream strap. The strap bracket is provided with a fixing strap for fixing the electronic signal sensor of the upstream signal channel and / or the downstream signal channel, and the distances and positions of the upstream, middle - stream and downstream signal channels are determined by the strap bracket.

[0052] As a preferred mode, when at least one of the upstream signal channel and the downstream signal channel is an electronic signal sensor, the electronic signal sensor is also attached to the limb to be measured through a strap body, and the strap body of the electronic signal sensor is connected to the strap body of the middle - stream strap.

[0053] As a preferred mode, when at least one of the upstream signal channel and the downstream signal channel is an electronic signal sensor, the electronic signal sensor is separated from the middle - stream strap.

[0054] On the other hand, the present invention provides a non - invasive blood pressure measuring device for pulse waves, which is characterized by including the foregoing three - channel pulse wave signal sensing strap.

[0055] Blood flow and the elasticity of blood vessels are the main factors affecting the acquisition of pulse waveforms. When measuring the waveform of the large artery pressure in the cavity of the present invention, the horizontal position of the middle airbag of the three-channel signal sensor can be made equal to the height of the ascending aorta of the human body. For example, the three-channel signal sensor can be fixed on the upper arm of the left arm. At this time, the upstream signal channel is close to the human torso and very close to the large artery in the human cavity, such as the ascending aorta, minimizing the influence caused by blood vessel elasticity. Utilizing the relationship between the pressure inside the blood vessel and the pressure of the airbag strap outside the blood vessel under the condition that the width of the middle airbag strap is sufficient, the relationship between the blood pressures inside the upstream and middle blood vessels under the condition that the blood flow velocity is zero at the moment of the pulse takeoff point, and the relationship between the blood pressures inside the blood vessels in the fully blocked state and the semi-active state under the condition that the blood flow acceleration is zero, the maximum value of the blood pressure inside the blood vessel in the fully blocked state is obtained, which is approximately equal to the systolic pressure of the large artery in the cavity. At this time, due to being in the fully blocked state, the error caused by blood flow to the measurement is maximally avoided. Since in the diastolic state, the blood flow velocity is close to zero, the diastolic pressure of the large artery in the cavity is approximately equal to the diastolic pressure of the brachial artery or femoral artery.

[0056] Compared with the prior art, the present invention can accurately measure blood pressure, especially accurately measure the central artery pressure and other large artery pressures in the cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The drawings used in the present application will be briefly described below. Obviously, these drawings are only used to explain the concept of the present invention.

[0058] Figure 1 It is a schematic structural diagram of a three-channel pulse wave signal sensing strap with airbag cuffs at the upstream and downstream.

[0059] Figure 2 It is a schematic structural diagram of a three-channel pulse wave signal sensing strap with airbag cuffs at the upstream and downstream for the second type.

[0060] Figure 3 It is a schematic structural diagram of a three-channel pulse wave signal sensing strap with airbag cuffs at the upstream and downstream for the third type.

[0061] Figure 4 It is a composition structure diagram of the specific implementation manner of a three-channel pulse wave signal sensing strap with airbag cuffs at the upstream and downstream.

[0062] Figure 5 It is a schematic structural diagram of a three-channel pulse wave signal sensing strap with electronic signal sensors at the upstream and downstream for the first type.

[0063] Figure 6 It is a schematic structural diagram of a three-channel pulse wave signal sensing strap with electronic signal sensors at the upstream and downstream for the second type.

[0064] Figure 7Schematic diagram of the structure of a three-channel pulse wave signal sensing strap with electronic signal sensors at the upstream and downstream ends of the 3rd type.

[0065] Figure 8 Structural composition diagram of the specific implementation of a three-channel pulse wave signal sensing strap with electronic signal sensors in the upstream and downstream signal channels. Specific implementation

[0066] In the following, embodiments of a three-channel pulse wave signal sensing strap and a non-invasive blood pressure measuring device of the present invention will be described with reference to the accompanying drawings.

[0067] The embodiments described herein are specific specific implementations of the present invention and are used to illustrate the concept of the present invention. They are all explanatory and exemplary and should not be construed as limiting the embodiments of the present invention and the scope of the present invention. Except for the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the content disclosed in the claims and the specification of this application. These technical solutions include any obvious substitution and modification of the embodiments described herein.

[0068] The drawings in this specification are schematic diagrams, which assist in explaining the concept of the present invention and schematically show the shapes of various parts and their mutual relationships. Please note that in order to clearly show the structures of various parts of the embodiments of the present invention, the drawings may not be drawn according to the same scale. The same or similar reference numerals are used to represent the same or similar parts.

[0069] The present invention will be described below in conjunction with the specific implementation and with reference to the accompanying drawings.

[0070] Embodiment 1

[0071] As Figure 1 , 2 , as shown in the examples of FIGS. 3, the upstream, middle, and downstream signal channels of the three-channel pulse wave signal sensing strap of the present invention all adopt airbag cuffs, including an upstream airbag cuff 1, a middle airbag cuff 2, and a downstream airbag cuff 3, an air duct 4, and a strap body 5, etc. The inflatable airbags of the upstream airbag cuff 1, the middle airbag cuff 2, and the downstream airbag cuff 3 are respectively connected to an air duct 4, and these three air ducts 4 are respectively docked with three corresponding connection sockets of the non-invasive blood pressure measuring device.

[0072] The interval distances of the three signal channels of the upstream airbag cuff 1, the middle-stream airbag cuff 2, and the downstream airbag cuff 3 are designed according to the length of the limb of the subject to be measured. For example, they can be divided into three models: large, medium, and small. According to the usage requirements, the three signal channels can be closely connected to form a whole, or they can be fixedly connected at an interval. The interval distance between the upstream airbag cuff 1 and the middle-stream airbag cuff 2 can be between 0 cm and 15 cm, and the interval distance between the middle-stream airbag cuff 2 and the downstream airbag cuff 3 can be between 0 cm and 30 cm.

[0073] When the middle-stream airbag cuff 2 is inflated, it can block arterial blood flow. The airbag width of the middle-stream airbag cuff 2 is the same as that of the traditional Korotkoff sound method airbag cuff, and the minimum width is determined according to the limb circumference of the subject to be measured.

[0074] The upstream airbag cuff 1 is bound and connected to the middle-stream airbag cuff 2, and the middle-stream airbag cuff 2 is fixedly connected to the downstream airbag cuff 3, so that the upstream, middle-stream, and downstream airbags are fixedly installed on the same strap body. When in use, they are bound to the same limb of the subject to be measured, and during the use process, the relative positions of the upstream, middle-stream, and downstream airbags remain fixed.

[0075] Figure 4 It is a composition structure diagram of the specific implementation manner of the three-channel pulse wave signal sensing strap with airbag cuffs at the upstream and downstream.

[0076] The upstream airbag cuff 1 is connected to the two-way air valve 20 through a pipeline, and at the same time is connected to the pressure sensor 10 through a pipeline.

[0077] The middle-stream airbag cuff 2 is connected to the two-way air valve 21 through a pipeline, and at the same time is connected to the microporous air valve 7 through a pipeline. The other end of the microporous air valve 7 is connected to the downstream airbag cuff 3 through a pipeline.

[0078] The downstream airbag cuff 3 is connected to the two-way air valve 22 through a pipeline, and at the same time is connected to the pressure sensor 11 and the other end of the microporous air valve 7 through a pipeline. The other ends of the three two-way air valves 20, 21, and 22 are connected together through a pipeline, and are connected to the pressure sensor 12, the air pump 9, and the linear air valve 8 through a pipeline.

[0079] The output ends of the signal amplifiers 13, 14, and 15 are connected to the three analog-to-digital converter (ADC) input ends of the microprocessor 18 through wires.

[0080] The microprocessor 18 is connected to the display 16 and the keyboard 17. The microprocessor 18 is also connected to the three two-way air valves 20, 21, and 22, the three signal pressure sensors 10, 11, and 12, the linear air valve 8, and the air pump 9 through wires.

[0081] Embodiment 2

[0082] Such as Figure 5 、6 As shown in the example of Fig. 7, in the three-channel pulse wave signal sensing strap of the present invention, electronic signal sensors are used in the upstream and downstream signal channels, while an airbag cuff is used in the middle signal channel, including an upstream electronic signal sensor cuff 31, a middle airbag cuff 2, a downstream electronic signal sensor cuff 33, an air duct 4, and a strap body 5, etc. The electronic signal sensor is, for example, a pressure sensor or a photoelectric sensor. The inflatable airbag of the middle airbag cuff 2 is connected to an air duct 4, and the air duct 4 is docked with a corresponding connection socket of the host of the non-invasive blood pressure measuring device. The electronic signal sensors of the upstream electronic signal sensor cuff 31 and the downstream electronic signal sensor cuff 33 are respectively docked with two corresponding connection sockets of the non-invasive blood pressure measuring device through signal connection lines 23.

[0083] It should be noted here that: Figure 8 For the sake of simplicity, Figure 8 in the upstream electronic signal sensor cuff 31 and the downstream electronic signal sensor airbag cuff 33 in

[0084] are only schematically shown with the electronic signal sensors, and the strap body required for the electronic signal sensors is not shown. Due to the change of the pressure in the blood vessels, the skin has slight undulations on the body surface. Therefore, when measuring blood pressure, a strap body as a restraint mechanism is needed to restrain the electronic signal sensor on the skin surface with a certain pressure to achieve the purpose of accurately measuring blood pressure.

[0085] It should also be noted that: the upstream signal channel, the middle signal channel, and the downstream signal channel are divided according to the blood flow direction of the limb. The middle signal channel is arranged at the place where the brachial artery signal of the upper limb or the femoral artery signal of the lower limb is measured, while the upstream signal channel and the downstream signal channel are respectively upstream and downstream of the blood flow of the middle signal channel, and are used to detect the pulse wave signal. Their positions are subject to achieving the purpose of the present invention and can be set by those skilled in the art according to needs. Regarding the positions of the upstream signal channel and the downstream signal channel of the present invention, as can be seen from the descriptions of the previous Embodiment 1 and Embodiment 2, preferred positions can be given, but their positions are not limited to these preferred positions. For example, the downstream signal channel can be arranged at the wrist pulse, such as at the wrist artery.

[0086] When the middle - stream air - bag cuff 2 is inflated, it can block arterial blood flow. The width of the air - bag of the middle - stream air - bag cuff 2 is the same as that of the air - bag in the traditional Korotkoff sound method, and the minimum width is determined according to the limb circumference of the person being measured.

[0087] The upstream electronic - signal sensor cuff 31 is bound and connected to the middle - stream air - bag cuff 2, and the middle - stream air - bag cuff 2 is fixedly connected to the downstream electronic - signal sensor 33. Thus, the upstream, middle - stream, and downstream signal channels are fixedly installed on the same strap body. When in use, they are bound to the same limb of the person being measured, and during the use process, the relative positions of the upstream, middle - stream, and downstream signal channels remain fixed.

[0088] In the case of using electronic - signal sensors such as pressure sensors or optoelectronic sensors upstream and downstream, a strap bracket can be used to fix the upstream and downstream pressure sensors or optoelectronic sensors, as well as the middle - stream air - bag strap. The distances and positions of the upstream, middle - stream, and downstream signal channels are determined by the strap bracket. The interval distance between the edge position of the upstream electronic - signal sensor and the upper edge of the middle - stream air - bag can be between 0 and 15 cm, typically 1 cm. The interval distance between the edge position of the downstream electronic - signal sensor and the lower edge of the middle - stream air - bag can be between 0 and 30 cm, typically 1 cm.

[0089] There are fixing straps for fixing the upstream and downstream sensors on the strap bracket. During actual measurement applications, the fixing straps of the upstream and downstream sensors are tightened appropriately so that the upstream and downstream sensors can be fixed on the body surface at the brachial artery of the limb of the person being measured, making them immovable and at the same time not affecting blood flow.

[0090] Figure 8 It is a composition structure diagram of a specific implementation manner of a three - channel pulse - wave signal sensing strap with electronic - signal sensors for the upstream and downstream signal channels.

[0091] As Figure 8 shown, this three - channel pulse - wave signal sensing strap uses electronic - signal sensors in the upstream and downstream signal channels. The electronic - signal sensors are specifically pressure sensors or optoelectronic sensors, while the middle - stream signal channel uses an air - bag cuff. For simplicity, in Figure 8 it schematically and directly shows the electronic - signal sensors of the upstream electronic - signal sensor cuff 31 and the downstream electronic - signal sensor cuff 33, and does not show the strap body of the upstream electronic - signal sensor cuff 31 and the downstream electronic - signal sensor cuff 33.

[0092] The electronic signal sensor of the upstream electronic signal sensor cuff 31 is connected to the signal amplifier 14 through a wire, and the electronic signal sensor of the downstream electronic signal sensor cuff 33 is connected to the signal amplifier 15 through a wire. The middle airbag cuff 2 is connected to the two-way air valve 21 through a pipeline, and the other end of the two-way air valve 21 is connected to the pressure sensor 12, the air pump 9 and the linear air valve 8 through a pipeline.

[0093] The microprocessor 18 is connected to the display 16 and the keyboard 17. The microprocessor 18 is also connected to the two-way air valve 21, the pressure sensor 12, the linear air valve 8 and the air pump 9 through wires.

[0094] The pressure sensor 12, the electronic signal sensor of the upstream electronic signal sensor cuff 31, and the electronic signal sensor of the downstream electronic signal sensor cuff 33 are respectively connected to the signal amplifiers 13, 14, and 15 through wires. The output ends of the signal amplifiers 13, 14, and 15 are connected to the three analog-to-digital converter (ADC) input ends of the microprocessor 18 through wires.

[0095] Embodiment 2 shows an embodiment in which electronic signal sensors are used in the upstream and downstream signal channels. However, Embodiment 2 is only an example to explain the concept of the present invention. The present invention is not limited to such an embodiment. The present invention can also be designed such that either the upstream signal channel or the downstream signal channel adopts an electronic signal sensor specifically a pressure or photoelectric sensor, while the other one still adopts an internally inflated airbag; that is, in such a technical solution, either the upstream signal channel or the downstream signal channel adopts an electronic signal sensor specifically a pressure or photoelectric sensor, while the other signal channel and the middle signal channel both adopt internally inflated airbags. Based on the above descriptions of Embodiments 1 and 2, those skilled in the art can easily understand such a technical solution.

[0096] Embodiment 3

[0097] The non-invasive blood pressure measurement device for pulse waves of the present invention may include the three-channel pulse wave signal sensing straps of any of the foregoing embodiments, and its structure can be referred to the previous text description and Figures 1-8 , for the sake of brevity, it will not be repeated here.

[0098] It should be noted here that in the specific embodiments of the present application, only such as Figure 4 and 8For the two structures shown, however, in fact, for both the non-invasive blood pressure measuring device of the present invention and the three-channel pulse wave signal sensing strap, one of the upstream signal channel and the downstream signal channel can adopt the structure of an electronic signal sensor. In this case, the signal channel adopting the electronic signal sensor is directly connected to the signal amplifier by an electric wire. In this situation, those skilled in the art can obviously design the structure between the three signal channels and the microprocessor according to the foregoing description of the present application.

[0099] Moreover, the present invention can be applied to measure the upper limb and also the lower limb. When measuring blood pressure through the upper limb, the obtained blood pressure value is the ascending aortic pressure or the brachiocephalic artery pressure. When measuring blood pressure through the lower limb, the obtained blood pressure value is the abdominal aortic pressure, more specifically, the blood pressure at the end of the abdominal aorta. It is advisable to perform the measurement operation in a lying position so that the position of the middle airbag is basically at the same height as the abdominal aorta.

[0100] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several equivalent substitutions or obvious variations are made, and if the performance or use is the same, they should all be regarded as belonging to the patent protection scope determined by the claims submitted for the present invention.

Claims

1. A three-channel pulse wave signal sensing strap, characterized in that: Corresponding to the measured limb, the three-channel pulse wave signal sensing strap is divided into an upstream signal channel, a midstream signal channel, and a downstream signal channel according to the blood flow direction. When measuring blood pressure, the upstream signal channel, the midstream signal channel, and the downstream signal channel are respectively fixed at the upstream, midstream, and downstream in the blood flow direction. The upstream signal channel is an upstream strap body with an internal inflatable airbag or an upstream electronic signal sensor. The midstream signal channel includes a midstream strap body with an internal inflatable airbag. The downstream signal channel is a downstream strap body with an internal inflatable airbag or a downstream electronic signal sensor. Among them, when the midstream strap body of the inflatable airbag in the midstream signal channel is inflated, it blocks the arterial blood flow and is docked with the host of the non-invasive blood pressure measurement device through a gas conduit to transmit the vascular pressure signal. When the upstream signal channel is the upstream strap body with an internal inflatable airbag and / or the downstream signal channel is the downstream strap body with an internal inflatable airbag, it is also docked with the host of the non-invasive blood pressure measurement device through a gas conduit to transmit the vascular pressure signal. When the upstream signal channel is the upstream electronic signal sensor and / or the downstream signal channel is the downstream electronic signal sensor, they respectively transmit the pulse wave signals of the upstream and downstream of the blood flow to the host of the non-invasive blood pressure measurement device. Among them, the specific processing method of the host includes: When the host inflates the midstream strap body of the inflatable airbag in the midstream signal channel to be greater than the arterial blood systolic pressure, so that the arterial blood vessel is in a completely blocked state, and collects the blood pressure of the upstream signal channel; After the midstream strap body of the inflatable airbag in the midstream signal channel blocks the arterial blood flow, it gradually deflates. When the midstream strap body of the inflatable airbag in the midstream signal channel is in a semi-blocked state and at the starting point of the signal output of the downstream signal channel, collect the air pressure value of the midstream strap body of the inflatable airbag in the midstream signal channel; The host takes the second derivative of the fluctuation curve of the air pressure value when the midstream strap body of the inflatable airbag in the midstream signal channel is in a semi-blocked state, finds the first zero crossing point from positive to negative, that is, the blood flow acceleration zero crossing point, and measures the delay time from the starting point to the acceleration zero crossing point. For the semi-blocked state and the completely blocked state, starting from the starting point, find the respective above-mentioned delay time points; and The host collects the upstream pulse wave signal curve of the upstream signal channel in the completely blocked state and the arterial blood vessel pressure at the acceleration zero crossing point of the upstream signal channel, and calculates the maximum value of the arterial blood vessel pressure in the upstream signal channel; and The interval distances between the upstream signal channel, the midstream signal channel, and the downstream signal channel are designed according to the length of the measured person's limb. The three signal channels can be tightly connected into a whole or spaced apart by a certain distance through a connecting structure. Among them, the interval distance range between the edge of the upstream signal channel and the edge of the midstream signal channel is 0 to 25 cm, and the interval distance between the edge of the midstream signal channel and the edge of the downstream signal channel is 0 to 30 cm.

2. The three-channel pulse wave signal sensing strap according to claim 1, wherein, The spacing distance between the upstream signal channel edge and the midstream signal channel edge is 1 centimeter; the spacing distance between the midstream signal channel edge and the downstream signal channel edge ranges from 1 centimeter.

3. The three-channel pulse wave signal sensing strap according to claim 1, wherein, When the downstream signal channel is the downstream strap body with an inflatable airbag and the upper limb is measured, the downstream strap body of the inflatable airbag of the downstream signal channel is bound at a position below the elbow joint; and when the lower limb is measured, the downstream strap body of the inflatable airbag of the downstream signal channel is bound at a position below the knee joint.

4. The three-channel pulse wave signal sensing strap according to claim 1, wherein, The upstream signal channel, the midstream signal channel and the downstream signal channel should be bound on the same measured limb, and during use, the relative positions of the upstream signal channel, the midstream signal channel and the downstream signal channel remain fixed.

5. The three-channel pulse wave signal sensing strap according to claim 1, wherein, When at least one of the upstream signal channel and the downstream signal channel is an electronic signal sensor, the electronic signal sensor is a pressure sensor or a photoelectric sensor.

6. The three-channel pulse wave signal sensing strap according to any one of claims 1-4, wherein, When the upstream signal channel, the midstream signal channel and the downstream signal channel are all strap bodies with built-in inflatable airbags, the strap body of the upstream signal channel is fixedly connected to the strap body of the midstream signal channel, the strap body of the midstream signal channel is fixedly connected to the strap body of the downstream signal channel, and the strap bodies of the upstream signal channel, the midstream signal channel and the downstream signal channel are fixedly installed as the same strap body.

7. The three-channel pulse wave signal sensing strap according to any one of claims 1, 2, 4, and 5, wherein, When at least one of the upstream signal channel and the downstream signal channel is an electronic signal sensor, a strap bracket is used to fix the electronic signal sensors of the upstream signal channel and / or the downstream signal channel and the midstream strap. The strap bracket is provided with a fixing strap for fixing the electronic signal sensors of the upstream signal channel and / or the downstream signal channel, and the distances and positions of the upstream, midstream and downstream signal channels are determined by the strap bracket.

8. The three-channel pulse wave signal sensing strap according to any one of claims 1, 2, 4, and 5, wherein, When at least one of the upstream signal channel and the downstream signal channel is an electronic signal sensor, the electronic signal sensor is also attached to the measured limb through a strap body, and the strap body of the electronic signal sensor is connected to the strap body of the midstream strap.

9. A non-invasive blood pressure measuring device for pulse waves, characterized in that, Including the three-channel pulse wave signal sensing strap according to any one of claims 1-8.

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