Blood pressure measuring device and using method thereof

Abstract

The invention relates to a blood pressure measuring device and a using method thereof.The blood pressure measuring device comprises an inflation and deflation unit and a blood pressure characterization element and further comprises a measuring cover with an open measuring opening in the bottom, the bottom of the measuring cover is a measuring cover contact part used for making contact with the skin of a patient, and the blood pressure characterization element is used for characterizing the pressure of an inner cavity of the measuring cover; a measuring cavity is defined by the measuring cover and the skin of the patient, and a measuring cover fixing structure used for fixing the measuring cover to the limb of the patient is arranged on the measuring cover. A cuff bag structure in the prior art is abandoned, the measuring cover contact part at the bottom of the measuring cover is in direct contact with the skin of a patient, so that blood pressure is directly transmitted to the measuring cavity through the skin and then is represented by the blood pressure characterization element, and a non-homogeneous fluid cuff bag material is completely not used in the whole pressure transmission process; therefore, the influence of the cuff bag material on the measurement of pressure characterization can be avoided, and the problem of inaccurate blood pressure measurement caused by non-uniform pressure transmission of the cuff bag is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a blood pressure measuring device and a method for using the same. Background Art

[0002] A blood pressure measuring device, also known as a sphygmomanometer, is a medical device used to measure a patient's blood pressure, where the patient's blood pressure refers to systolic blood pressure and diastolic blood pressure.

[0003] In the prior art, the basic principle of a blood pressure measuring device is as Figure 1 shown, including a cuff bladder 3, and also including an inflation and deflation device for inflating and deflating the cuff bladder. The inflation and deflation device includes an air pump (not shown in the figure), and the air pump is connected to the cuff bladder through an air path. The blood pressure measuring device also includes a pressure indicating element 5 and a measuring element 6. In the figure, item 1 represents a patient's limb; item 2 represents a blood vessel in the patient's limb.

[0004] Its basic measuring principle is to tie the cuff bladder around the arm and then inflate and pressurize it. At this time, the inflated cuff bladder will block the blood in the blood vessel, and then slowly deflate. The pressure indicating element can be a pressure sensor or a mercury manometer.

[0005] For a blood pressure measuring device using the Korotkoff sound method, the measuring element is a stethoscope or a Korotkoff sound collection sensor. During the blood pressure measurement process, the measuring element hears the change in the sound of the artery. When the pressure in the cuff bladder exceeds the systolic blood pressure, the artery is compressed and the blood flow stops, and no sound can be heard; when the pressure drops below the systolic blood pressure, the blood starts to flow, and at this time, a change in sound can be heard. Then continue to deflate. When the pressure is lower than the diastolic blood pressure, the blood flow resumes. In this way, the values of the systolic blood pressure and the diastolic blood pressure are determined through the change points of the sound.

[0006] For a blood pressure measuring device using the oscillometric method, the measuring element and the pressure indicating element can be the same pressure sensor. The oscillometric method analyzes the blood pressure by detecting the pressure fluctuations in the cuff bladder. When the cuff bladder deflates, the pulsation of the artery will cause minute fluctuations in the pressure of the cuff bladder, and the amplitude of these fluctuations will change with the change in the pressure of the cuff bladder. The maximum fluctuation corresponds to the mean arterial pressure, and then the systolic blood pressure and the diastolic blood pressure are calculated through an algorithm.

[0007] Whether it is a blood pressure measuring device using the Korotkoff sound method or an oscillometric blood pressure measuring device, they both belong to the prior art. During the use of the existing blood pressure measuring device, the applicant found that the blood pressure measurement of the existing blood pressure measuring device fluctuates greatly, and the blood pressure value changes every time it is measured. That is to say, its blood pressure measurement value is not particularly accurate.

[0008] The applicant's analysis of the reasons for the fluctuations in its numerical values is as follows: The gas pressure in the cuff bladder is used to represent the blood pressure in the patient's blood vessels. The pressure transmission process is that the blood pressure in the blood vessels is transmitted through the skin to the cuff bladder, and then through the cuff bladder to the gas in the cuff bladder. Finally, the indicating element uses Pascal's principle to represent the gas pressure in the cuff bladder. For the entire process, only the blood and the gas in the cuff bladder can be considered homogeneous fluids and applicable to Pascal's principle. For the skin, especially the material of the cuff bladder itself, it does not belong to a homogeneous fluid. Therefore, there are certain deviations in its pressure transmission process, which will affect the changes in blood pressure values during each measurement. Summary of the Invention

[0009] The purpose of the present invention is to provide a blood pressure measuring device to solve the technical problem in the prior art that the material of the cuff bladder is not a homogeneous fluid, resulting in transmission errors during the pressure transmission process, and further leading to inaccurate blood pressure detection values.

[0010] To solve the above technical problem, the technical solution of a blood pressure measuring device in the present invention is as follows: A blood pressure measuring device includes an inflation / deflation unit and a blood pressure indicating element, and further includes a measuring cover with an open measuring port at the bottom. The bottom of the measuring cover is a measuring cover contact part for contacting the patient's skin. The inflation / deflation unit communicates with the inner cavity of the measuring cover. The blood pressure indicating element is used to indicate the pressure in the inner cavity of the measuring cover. A measuring cavity is formed between the measuring cover and the patient's skin. The measuring cover is provided with a measuring cover fixing structure for fixing the measuring cover on the patient's limb.

[0011] Further, the measuring cover fixing structure is a strap-type fixing structure.

[0012] Further, the measuring cover fixing structure includes negative pressure cavities provided on the left and right sides and / or the front and back sides of the measuring cover. The inflation / deflation unit is connected to the negative pressure cavities.

[0013] Further, a sealing ring with the bottom for contacting the patient's skin is provided on the periphery of the measuring cover. The bottom height of the sealing ring is lower than the bottom height of the measuring cover contact part. The negative pressure cavity is formed by the sealing ring and the corresponding side of the measuring cover.

[0014] Further, the blood pressure indicating element is a pressure sensor or a mercury manometer.

[0015] Further, the blood pressure measuring device further includes a measuring element, and the measuring element is a stethoscope, a sound collection sensor or a pressure sensor.

[0016] The technical solution of the usage method of a blood pressure measuring device in the present invention is as follows: The method includes the following steps. In the first step, a measuring cover fixing structure is used to fix the measuring cover on the patient's limb. The contact part of the measuring cover contacts and fixes with the patient's skin. A measuring cavity is formed between the measuring cover and the patient's skin. The skin corresponding to the measuring cavity is called the measuring skin area. In the second step, an inflation / deflation unit inflates or deflates the measuring cavity with an inflation or deflation pressure of F1. Subsequently, the measuring cavity communicates with the atmosphere through the inflation / deflation unit, and the measuring skin area relaxes. In the third step, the inflation / deflation unit inflates the measuring cavity with an inflation pressure of F2, where F2 < |F1|. Subsequently, the measuring cavity is depressurized, and the systolic blood pressure and diastolic blood pressure of the patient are measured using the Korotkoff sound blood pressure measurement method or the oscillometric blood pressure measurement method.

[0017] The beneficial effects of the present invention are as follows: Compared with the prior art, the most important improvement of the present invention is that the cuff bladder structure in the prior art is abandoned, and the contact part of the measuring cover at the bottom directly contacts the patient's skin. In this way, the blood pressure is directly transmitted to the measuring cavity through the skin and then characterized by the blood pressure characterization element. The non-uniform fluid cuff bladder material is no longer used throughout the pressure transmission process. Therefore, the measurement influence of the cuff bladder material on pressure characterization can be avoided, and the problem of inaccurate blood pressure measurement caused by uneven pressure transmission of the cuff bladder can be reduced.

[0018] Furthermore, in the present invention, when the inflation pressure F2 is introduced into the measuring cavity, it is to measure the patient's blood pressure. Before measuring the patient's blood pressure, first perform a positive or negative pressure operation of F1 on the measuring cavity. In this way, the measuring skin area of the patient will be pressured or suctioned, making the measuring skin area in a relaxed state. Since |F1| > F2, when inflating with F2 for blood pressure detection, the secondary deformation amount of the measuring skin area is less than the primary deformation amount of the measuring skin area. In this way, the problem of inaccurate blood pressure measurement caused by uneven pressure transmission in the measuring skin area can be reduced. Description of the Drawings

[0019] By reading the following detailed description with reference to the drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present disclosure will become readily understandable. In the drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, where: Figure 1 is a usage state diagram of a blood pressure measurement device in the prior art; Figure 2 is a schematic structural diagram of an embodiment of the blood pressure measurement device in the present invention; Figure 3 is Figure 2 a bottom view showing the distribution of the left negative pressure cavity, the measuring cavity, and the right negative pressure cavity in Figure 4 is a usage state diagram of an embodiment of the blood pressure measurement device in the present invention; Figure 5 It is a schematic diagram of the state during the first negative pressure suction in the measurement cavity of the present invention; Figure 6 It is a schematic diagram of the state after the pressure in the measurement cavity is released in the present invention; Figure 7 It is a schematic diagram of the state when positive pressure is filled into the measurement cavity and blood pressure measurement is performed on the patient in the present invention; 1. Patient's limb; 2. Blood vessel; 3. Cuff bladder; 4. Blood pressure measurement device; 5. Pressure sensor; 6. First air path; 7. Second air path; 8. Atmospheric connection port; 9. Valve group; 10. Air pump; 11. Third air path; 12. Sealing ring; 13. Left negative pressure cavity; 14. Measurement cover contact part; 15. Measurement cover; 16. Measurement cavity; 17. Right negative pressure cavity; 18. Sound collection sensor; 19. Measured skin area. Detailed implementation manners

[0020] For the convenience of understanding the present invention, the present invention will be described in more detail below with reference to the drawings and specific embodiments. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive.

[0021] It should be noted that unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention.

[0022] An embodiment of a blood pressure measurement device in the present invention is as Figures 2 - 7 shown: It includes a measurement cover 15 with an open measurement port at the bottom. The bottom of the measurement cover 15 is a measurement cover contact part 14 for contacting the patient's skin. During use, the measurement cover contact part 14 contacts the patient's skin, and a measurement cavity 16 is formed between the measurement cover 15 and the patient's skin.

[0023] An air charging and discharging unit is provided on the upper side of the measurement cover 15. The air charging and discharging unit includes an air pump 10 and a valve group 9 connected to the air port of the air pump. The valve group 9 has an atmospheric connection port 8 communicating with the atmosphere. Both the air pump 10 and the valve group 9 are fixed on the upper side of the measurement cover 15.

[0024] The blood pressure measurement device further includes a blood pressure characterization element and a measurement element. In this embodiment, the blood pressure characterization element is a pressure sensor (not shown in the figure) for detecting the pressure in the measurement cavity, and the measurement element is a sound collection sensor 18. The blood pressure measurement device in the present invention is a Korotkoff sound blood pressure measurement device using the Korotkoff sound method.

[0025] The measuring cover is provided with a measuring cover fixing structure for fixing the measuring cover on the patient's limb. In this embodiment, the measuring cover fixing structure includes negative pressure chambers arranged on the left and right sides of the measuring cover, and the air charging and discharging unit is connected to the negative pressure chambers. The negative pressure chambers include a left negative pressure chamber 13 on the left side of the measuring cover and a right negative pressure chamber 17 on the right side of the measuring cover.

[0026] One of the air ports passed by the valve group is connected to the right negative pressure chamber 17 through a first air path 6, one of the air ports of the valve group is connected to the measuring chamber 16 through a second air path 7, and another air port of the valve group is connected to the left negative pressure chamber 13 through a third air path 11.

[0027] During specific use, First step, use the measuring cover fixing structure to fix the measuring cover 15 on the patient's limb. The contact part 14 of the measuring cover is in contact with and fixed to the patient's skin. A measuring chamber 16 is formed between the measuring cover 15 and the patient's skin. The skin corresponding to the measuring chamber 16 is called the measuring skin area 19. Specifically, the air pump sucks air from the left negative pressure chamber and the right negative pressure chamber, and relies on the suction force to fix the measuring cover on the skin of the patient's limb. The skin of the patient located inside the measuring cover is called the measuring skin area, as Figure 4 shown; Second step, the air charging and discharging unit pumps air out of the measuring chamber, and the pumping pressure is F1, as Figure 5 shown. Subsequently, the measuring chamber communicates with the atmosphere through the air charging and discharging unit, and the measuring skin area relaxes, as Figure 6 shown; Third step, the air charging and discharging unit inflates the measuring chamber, and the inflation pressure is F2, F2 < |F1|, as Figure 7 shown. Subsequently, the measuring chamber is depressurized, and the systolic and diastolic blood pressures of the patient are measured by using the Korotkoff sound blood pressure measurement method or the oscillometric blood pressure measurement method. The value of F2 belongs to the prior art. As long as it is greater than the diastolic and systolic blood pressures of a normal person, it is a prior art value. For example, F2 can be 250 mmHg, 270 mmHg, etc. After the inflation pressure is F2, during the depressurization process of the measuring chamber through the atmosphere communication port, the measurement of blood pressure belongs to the prior art. For example, it can be like this: During the blood pressure measurement process, the sound collection sensor hears the change of the arterial sound. When the pressure in the measuring chamber exceeds the systolic blood pressure, the artery is compressed and the blood flow stops, and no sound can be heard; when the pressure drops below the systolic blood pressure, the blood starts to flow, and at this time, the change of the sound can be heard. Then continue to deflate. When the pressure is lower than the diastolic blood pressure, the blood flow resumes. In this way, the systolic and diastolic blood pressure values are determined through the change points of the sound.

[0028] In other embodiments of the present invention, the blood pressure characterization element may also be a mercury column; the measuring element may also be a stethoscope; the blood pressure measuring device may also be an oscillometric blood pressure measuring device. At this time, the measuring element may be a pressure sensor. When the blood pressure characterization element uses a pressure sensor, the measuring element and the blood pressure characterization element may share the same pressure sensor; the measuring cover fixing structure may also be a strap-type fixing structure. At this time, the measuring cover is fixed to the patient's limb by a strap.

[0029] An embodiment of the usage method of a blood pressure measuring device is as Figures 2 - 7 shown: The first step is to use the measuring cover fixing structure to fix the measuring cover on the patient's limb. The contact part of the measuring cover is in contact with the patient's skin for fixation. A measuring cavity is formed between the measuring cover and the patient's skin. The skin corresponding to the measuring cavity is called the measuring skin area. Specifically, the air pump sucks air into the left negative pressure cavity and the right negative pressure cavity, and relies on the suction force to fix the measuring cover on the patient's limb skin. The skin of the patient located inside the measuring cover is called the measuring skin area, as Figure 4 shown; The second step is that the air charging and discharging unit pumps air out of the measuring cavity, and the pumping pressure is F1, as Figure 5 shown. Subsequently, the measuring cavity communicates with the atmosphere through the air charging and discharging unit, and the measuring skin area relaxes, as Figure 6 shown; The third step is that the air charging and discharging unit inflates the measuring cavity, and the inflation pressure is F2, F2 < |F1|, as Figure 7 shown. Subsequently, the measuring cavity is depressurized, and the systolic blood pressure and diastolic blood pressure of the patient are measured by using the Korotkoff sound blood pressure measurement method or the oscillometric blood pressure measurement method.

[0030] In other embodiments of the present invention, in the second step, pumping air out of the measuring cavity through the air charging and discharging unit can also be replaced by the method of inflating the measuring cavity through the air charging and discharging unit. The inflation pressure is F1, then the inflation pressure F2 in the third step is less than F1.

[0031] In the above description of this specification, unless otherwise clearly specified and limited, terms such as "fixing", "installing", "connecting" or "linking" should be understood in a broad sense. For example, in terms of the term "connecting", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the communication inside two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly limited in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

[0032] Based on the above description of this specification, those skilled in the art can also understand the following terms used, such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise", etc. The terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of this specification. It is only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in the specific orientation. Therefore, the above terms of orientation or positional relationship cannot be understood or interpreted as a limitation to the solution of the present invention.

[0033] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this specification, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise specifically and clearly defined.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A blood pressure measuring device, comprising an air filling and discharging unit and a blood pressure characterization element, characterized in that: It also includes a measuring cover with an open measuring port at the bottom, the bottom of the measuring cover is a measuring cover contact part for contacting the patient's skin, the inflation and deflation unit is connected to the inner cavity of the measuring cover, the blood pressure characterization element is used to characterize the pressure of the inner cavity of the measuring cover, a measuring cavity is formed between the measuring cover and the patient's skin, and a measuring cover fixing structure is provided on the measuring cover for fixing the measuring cover to the patient's limb.

2. The blood pressure measuring device according to claim 1, characterized in that: The measuring cover fixing structure is a strap-type fixing structure.

3. The blood pressure measuring device according to claim 1, characterized in that: The measurement cover fixing structure comprises a negative pressure cavity arranged on the left and right sides and / or the front and rear sides of the measurement cover, and the inflation and deflation unit is connected to the negative pressure cavity.

4. The blood pressure measuring device according to claim 3, characterized in that: The periphery of the measuring cover is provided with a sealing ring whose bottom is used to contact the patient's skin. The bottom height of the sealing ring is lower than the bottom height of the contact part of the measuring cover. The negative pressure cavity is surrounded by the sealing ring and the corresponding sides of the measuring cover.

5. The blood pressure measuring device according to any one of claims 1 to 4, characterized in that: The blood pressure characterization element is a pressure sensor or a mercury column.

6. The blood pressure measuring device according to any one of claims 1 to 4, characterized in that: The blood pressure measuring device further comprises a measuring element, which is a stethoscope, a sound collecting sensor or a pressure sensor.

7. A method for using the blood pressure measuring device according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: a first step, fixing the measuring cover on the patient's limb using a measuring cover fixing structure, the measuring cover contact portion being fixed in contact with the patient's skin, a measuring cavity being formed between the measuring cover and the patient's skin, and the skin corresponding to the measuring cavity being called a measuring skin area; a second step, inflating or exhausting air into the measuring cavity by an inflation and deflation unit, the inflation or exhaust pressure being F1, and then the measuring cavity is connected to the atmosphere through the inflation and deflation unit, and relaxation of the skin area is measured; a third step, inflating or exhausting air into the measuring cavity by the inflation and deflation unit, the inflation pressure being F2, F2<︱F1︱, and then depressurizing the measuring cavity, and measuring the systolic and diastolic blood pressures of the patient using a Korotkoff sound blood pressure measurement method or an oscillation blood pressure measurement method.

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