CN111603152A - An invasive blood pressure measuring device - Google Patents

Abstract

The application provides an invasive blood pressure measuring device, which comprises a pressure sensor and a pressure measuring pipeline, wherein when the measuring device is used, flowing liquid is filled in the pressure measuring pipeline; and the pressure sensor is arranged at a preset position in the pressure measuring pipeline. Wherein the predetermined position is a position where the negative pressure caused by the flow of the liquid stream in the conduit always counteracts the radial pressure. In the blood pressure measuring device's of this application pipeline, if entrance pressure promotes, can lead to the liquid flow velocity in the pipeline to improve, and then make the pipe wall negative pressure rise, this kind of negative pressure that rises also can offset each other with radial pressure, predetermine position department pressure promptly and let two kinds of pressures offset always, equals the pressure of the exit end of measuring the pipeline all the time. Therefore, the pressure sensor is arranged at the preset position, the measured pressure is equal to the pressure in the blood vessel, and the accuracy is extremely high. Meanwhile, the diameter of the needle tube can be greatly reduced according to the requirement, so that a large puncture wound on a patient is avoided, the pain of the patient is relieved, and the probability of complications is reduced.

Description

An invasive blood pressure measuring device

technical field

The present application relates to the technical field of medical devices, and in particular, to an invasive blood pressure measurement device.

Background technique

Blood pressure is one of the important parameters clinically used to detect human vital signs. Blood pressure measurement can be divided into two ways: non-invasive and invasive. Invasive blood pressure measurement is suitable for expected applications that require blood pressure monitoring, such as surgical patients, intensive care patients, and neonates. It has the characteristics of fast response time, accurate results, strong anti-interference and wide application range. Invasive blood pressure measurement, also known as direct blood pressure measurement, is to establish a direct channel with the patient's measurement site, and transmit the blood pressure to an external pressure sensor to obtain a pressure signal by means of liquid communication, thereby calculating the relevant parameter values, mainly including Systolic blood pressure, diastolic blood pressure, mean blood pressure and pulse rate, etc., which can provide continuous, reliable and accurate blood pressure data.

In order to ensure the accuracy of measurement, the existing invasive blood pressure measurement device needs to use a higher pressure perfusion, install a pressure sensor at the perfusion end, and insert a large-diameter perfusion needle into the arterial blood vessel of the limb at the same time. Due to the large diameter of the perfusion needle, it not only increases the difficulty of the medical staff in the puncture process, but also brings a large puncture wound to the patient, which brings greater pain to the patient, and makes the patient more susceptible to infection complications. Chances are higher.

SUMMARY OF THE INVENTION

The main purpose of the present application is to provide an invasive blood pressure measurement device, which aims to solve the drawback that the existing invasive blood pressure measurement device will bring a larger puncture wound to the patient during the measurement process.

To achieve the above purpose, the present application provides an invasive blood pressure measurement device, including a pressure sensor and a pressure measurement pipeline;

When the blood pressure measuring device is in use, the pressure measuring pipeline is filled with flowing liquid;

The pressure sensor is set at a preset position in the pressure measurement pipeline, wherein the preset position is the position where the negative pressure in the pressure measurement pipeline offsets the radial pressure, and the negative pressure is the position where the liquid is in the pressure measurement pipeline. The pressure generated on the inner surface of the pipe wall when flowing in the pressure measuring pipeline, and the radial pressure is the static pressure generated by the liquid flowing in the pressure measuring pipeline.

Further, the pressure measurement pipeline includes a perfusion tube, a microfluidic thin tube and a needle tube;

the perfusion tube, the microfluidic thin tube and the needle tube are connected in sequence;

The pressure sensor is arranged at the preset position in the microfluidic thin tube.

Further, the cross-sectional area of the microfluidic thin tube is less than 0.05 mm ² .

Further, the needle size of the needle tube is not greater than 25G.

Further, one end of the microfluidic thin tube is provided with a standard liquid flow input interface, and the other end is provided with a standard liquid flow output interface;

The microfluidic thin tube is connected to the perfusion tube through the standard liquid flow input interface;

The microfluidic thin tube is connected to the needle tube through the standard liquid flow output interface.

Further, the pressure sensor includes 4 strain resistances, and each of the strain resistances is symmetrically arranged in pairs with the pipe section where the preset position is located as a symmetry plane.

Further, the blood pressure measurement device includes a processor, and the processor is connected to the pressure sensor;

The processor is used for receiving and processing the pressure signal fed back by the pressure sensor.

Further, the blood pressure measurement device further includes an alarm device, and the alarm device is connected to the processor;

The alarm device is configured to output alarm information when the blood pressure value monitored by the pressure sensor is greater than a threshold value.

Further, the blood pressure measurement device further includes a display device, and the display device is connected to the processor;

The display device is used for displaying the blood pressure value and/or waveform graph monitored by the pressure sensor.

Further, the blood pressure measurement device further includes a communication device, the communication device is connected to the processor;

The communication device is configured to send a result of processing the pressure signal by the processor to a preset terminal.

An invasive blood pressure measurement device provided in this application includes a pressure sensor and a pressure measurement pipeline. When the blood pressure measurement device is in use, the pressure measurement pipeline is filled with flowing liquid; Set up. Among them, the preset position is the position where the negative pressure generated by the liquid flow in the pressure pipeline always offsets the radial pressure, the negative pressure is the pressure generated by the liquid on the inner surface of the pipe wall when the liquid flows in the pressure measuring pipeline, and the radial pressure The static pressure generated by the flow of the liquid in the pressure measuring line. In the pipeline of the blood pressure measuring device of the present application, if the pressure at the liquid flow inlet increases, the liquid flow velocity in the pipeline will increase, thereby increasing the negative pressure of the tube wall, but the rising negative pressure will also interact with the radial pressure. offset, so that the pressure at the preset position is always equal to the pressure at the outlet end of the measurement pipeline. Therefore, the pressure sensor is set at a preset position, and the measured pressure is equal to the pressure in the blood vessel, and the accuracy is extremely high. At the same time, the diameter of the needle tube can also be reduced as required, thereby avoiding causing a large puncture wound to the patient, alleviating the pain of the patient during the measurement process, and reducing the infection probability of complications.

Description of drawings

FIG. 1 is an overall structural diagram of an invasive blood pressure monitoring device according to an embodiment of the present application.

The realization, functional characteristics and advantages of the purpose of the present application will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

1, an embodiment of the present application provides an invasive blood pressure measurement device, including a pressure sensor 4 and a pressure measurement pipeline;

When the blood pressure measuring device is in use, the pressure measuring pipeline is filled with flowing liquid;

The pressure sensor 4 is set at a preset position in the pressure measurement pipeline, wherein the preset position is the position where the negative pressure in the pressure measurement pipeline offsets the radial pressure, and the negative pressure is the liquid The pressure generated on the inner surface of the pipe wall when flowing in the pressure measuring pipeline, and the radial pressure is the static pressure generated by the liquid flowing in the pressure measuring pipeline.

从而确定管道上的预设位。其中，传感器所安装位置的管道为固定形态，不会在使用过程中发生弯曲等形态变化，从而保证预设位的固定性。In this embodiment, the overall structure of the invasive blood pressure measurement device is similar to the structure of the existing invasive blood pressure measurement device, and the specific difference is that the blood pressure measurement device in this embodiment includes a pressure sensor 4 and a pressure measurement pipeline. Specifically, when the blood pressure measuring device is in use, the pressure measuring pipeline is filled with flowing liquid, and the pressure sensor 4 is set at a preset position in the pressure measuring pipeline. Among them, the preset position is the position where the negative pressure in the pressure measuring pipeline offsets the radial pressure, and the negative pressure refers to the pressure generated by the liquid on the inner surface of the pipe wall when the liquid flows in the pressure measuring pipeline; and the radial pressure is It is the static pressure generated by the flow of liquid in the pressure measuring pipeline. The calculation method of the preset position in this embodiment is: C×Ps=Pv, where C is the ratio of the distance from the preset position to the pipeline outlet to the total length of the pipeline, Ps is the static pressure at the inlet of the pressure measuring pipeline, and Pv The negative pressure generated by the flow rate of the liquid flow in the pressure measuring pipeline. And Ps=ρKV ² +n, Pv=1/2ρV ² , where ρ is the liquid density, V is the flow velocity of the liquid, and the values of K and n are related to the design parameters of the pipeline, specifically the diameter, length, and diameter of the pipeline. The friction coefficient of the inner wall is related to the bending condition, etc. The K constant is positively related to the impedance coefficient of the pipeline. n is the modification constant of K, and the n constant can be ignored during fitting. According to the above formula, the corresponding deformation is obtained to obtain C×(ρKV ² +n)=1/2ρV ² , which can be calculated by

This determines the preset bit on the pipe. Among them, the pipeline where the sensor is installed is in a fixed shape, and will not undergo morphological changes such as bending during use, thereby ensuring the fixation of the preset position.

In the existing invasive blood pressure measurement, in order to ensure the accuracy of the measurement, a large diameter perfusion needle 3 needs to be placed in the blood vessel of the patient through puncture, and the pressure sensor 4 is arranged as close to the needle 3 as possible, so as to truly reflect the blood pressure in the blood vessel. . If the diameter of the needle tube 3 is reduced, the liquid flow impedance in the needle tube 3 will increase, so that the pressure reflected by the pressure sensor 4 is far away from the true blood pressure of the patient, and the measurement accuracy is greatly reduced. In the invasive blood pressure measurement device of this embodiment, the pressure sensor 4 is set at a preset position in the pressure measurement pipeline, and the negative pressure at this position will cancel the radial pressure. Even if the diameter of the outlet end of the pressure measuring pipeline (ie the needle tube 3) is reduced, the liquid flow velocity in the pipeline will increase, the flow velocity will change and the negative pressure generated by the flow velocity will be reversely changed on the inner wall of the pipeline. The radial pressure affected by the upstream pressure change cancels each other out, so that the pressure at the preset position is always equal to the pressure at the outlet end of the measuring line. Therefore, the blood pressure measuring device of the present embodiment can select the needle tube 3 of any size as required, and it is not necessary to use a large diameter needle tube 3 to perform puncture measurement on the patient in order to compromise the accuracy of the measurement. That is, the blood pressure measurement device of this embodiment can select a small diameter needle tube 3 to perform puncture measurement on the user in order to reduce the pain of the patient's blood pressure measurement and reduce the infection probability of complications, while ensuring accurate measurement.

Further, the pressure measurement pipeline includes a perfusion tube 1, a microfluidic thin tube 2 and a needle tube 3, and the perfusion tube 1, the microfluidic thin tube 2 and the needle tube 3 are connected in sequence;

The pressure sensor 4 is arranged at the preset position in the microfluidic thin tube 2 .

Preferably, the cross-sectional area of the microfluidic thin tube 2 is less than 0.05 mm ² .

Preferably, the needle size of the needle tube 3 is not greater than 25G.

Preferably, one end of the microfluidic thin tube 2 is provided with a standard liquid flow input interface, and the other end is provided with a standard liquid flow output interface;

The microfluidic thin tube 2 is connected to the perfusion tube 1 through the standard liquid flow input interface;

The microfluidic thin tube 2 is connected to the needle tube 3 through the standard liquid flow output interface.

In this embodiment, the pressure measurement pipeline includes a perfusion tube 1, a microfluidic thin tube 2 and a needle tube 3. The perfusion tube 1, the microfluidic thin tube 2 and the needle tube 3 are connected in sequence, wherein the pressure sensor 4 is installed in the microfluidic control tube. At the preset position in the thin tube 2. Specifically, the perfusion tube 1 is a pipe of conventional size, one end is connected to the perfusion bottle through conventional structures such as a three-way switch and a flushing device, and the other end is connected to the microfluidic thin tube 2 . The perfusion bottle is hung at a high place and pressurized externally, so that the liquid in the perfusion bottle passes through the perfusion tube 1 and the microfluidic thin tube 2 to the needle tube 3 . One end of the microfluidic thin tube 2 is provided with a standard liquid flow input interface, and the other end is provided with a standard liquid flow output interface. One end of the microfluidic thin tube 2 is connected to the perfusion tube 1 through the standard liquid flow input interface, and the other end is connected to the needle tube 3 through the standard liquid flow output interface. Microfluidic tubing has an ultra-thin tubing design that enables high flow rates at small flow rates in pressure measuring lines. Preferably, the cross-sectional area of the microfluidic thin tube 2 is less than 0.05 mm ^{2 ,} and the needle size of the needle tube 3 is less than or equal to 25G. The small size microfluidic thin tube 2 and needle tube 3 can enable medical staff to use the blood pressure measuring device to puncture the patient without causing a large puncture wound, effectively reducing the pain of the patient and reducing the risk of complications at the wound. chance of infection.

Further, the pressure sensor 4 includes 4 strain resistances, and each of the strain resistances is arranged symmetrically in pairs with the pipe section where the preset position is located as a symmetry plane.

In this embodiment, the pressure sensor 4 is of a Venturi bridge structure, including four strain resistances. Wherein, each strain resistance takes the pipe section where the preset position is located as the symmetry plane, is symmetrically arranged in pairs, and is symmetrically distributed at the upstream and downstream positions of the preset position. The strain resistances are symmetrically distributed at the upstream and downstream positions of the preset position. On the one hand, because the diameter of the microfluidic thin tube 2 is too small, the pressure sensor 4 cannot be centrally arranged at a certain point of the preset position. On the other hand, the four strain resistances of the pressure sensor 4 are symmetrically arranged upstream and downstream of the preset position, and are evenly distributed, so that the pressure in the pipeline can be monitored more accurately.

Further, the blood pressure measurement device includes a processor, and the processor is connected to the pressure sensor 4;

The processor is used for receiving and processing the pressure signal fed back by the pressure sensor 4 .

Preferably, the blood pressure measurement device further comprises an alarm device, and the alarm device is connected to the processor;

The alarm device is used to output alarm information when the blood pressure value monitored by the pressure sensor 4 is greater than a threshold value.

Preferably, the blood pressure measurement device further comprises a display device, and the display device is connected to the processor;

The display device is used for displaying the blood pressure value and/or waveform graph monitored by the pressure sensor 4 .

Preferably, the blood pressure measurement device further includes a communication device, the communication device is connected to the processor; the communication device is configured to send the result of processing the pressure signal by the processor to a preset terminal.

In this embodiment, the blood pressure measurement device further includes a monitoring device 5, and the monitoring device 5 includes a processor, an alarm device, a display device, and a communication device, wherein the processor is connected to the pressure sensor 4 for receiving the pressure fed back by the pressure sensor 4 signal, and perform corresponding processing on the pressure signal, for example, compare the pressure value currently measured by the pressure sensor 4 with the threshold value, and output the corresponding control command according to the comparison result. The alarm device is connected to the processor, and when the processor recognizes that the blood pressure value detected by the pressure sensor is greater than the threshold value, the processor controls the alarm device to output alarm information. Wherein, the alarm device can be an alarm light, when the blood pressure value of the patient is greater than the threshold value, it continuously flashes to output alarm information, and plays a warning role to the patient's nursing staff. The display device (such as a display screen) of the blood pressure measurement device is connected to the processor, and after receiving the pressure signal fed back by the pressure sensor 4, the processor converts the pressure signal into a corresponding blood pressure value, and displays it through the display device; or, processes The device arranges the pressure signals in sequence according to the feedback time, and then displays them on the display device in the form of waveform diagrams, so that the nursing staff can clearly understand the changes of the patient's blood pressure. For the purpose of remote monitoring, the blood pressure measuring device is further provided with a communication device, which is connected to the processor and can receive the information transmitted by the processor. In addition, the communication device is connected to the preset terminal through wireless signals such as bluetooth and wifi, and can send the result of processing the pressure signal by the processor to the preset terminal through wireless signals. For example, the medical staff uses the blood pressure measuring device to monitor the blood pressure of the patient. After the processor converts the pressure signal fed back by the pressure sensor 4 into the corresponding blood pressure value, the blood pressure value is sent to the receiving terminal of the nurse's desk through the communication device, so that the medical staff of the nurse's desk can take care of the patient's blood pressure. Personnel can realize remote monitoring. Due to the large number of patients in the hospital, medical staff can achieve centralized care through remote monitoring, which alleviates the shortage of medical staff to a certain extent.

An invasive blood pressure measurement device provided in this embodiment includes a pressure sensor 4 and a pressure measurement pipeline, and the pressure measurement pipeline is filled with flowing liquid; and the pressure sensor 4 is set at a preset position in the pressure measurement pipeline. Among them, the preset position is the position where the negative pressure in the pressure pipeline offsets the radial pressure, the negative pressure is the pressure generated by the liquid on the inner surface of the pipe wall when the liquid flows in the pressure measuring pipeline, and the radial pressure is the pressure generated by the liquid in the pressure measuring pipeline. Static pressure due to internal flow. In the blood pressure measurement device of the present application, if the diameter of the outlet end of the pressure measurement pipeline (ie, the needle tube 3 ) is reduced, the liquid flow velocity in the pipeline will increase, thereby increasing the negative pressure of the tube wall, but the rising negative pressure will It will also cancel each other out with the radial pressure, so that the pressure at the preset position is always equal to the pressure at the outlet end of the measurement pipeline. Therefore, the pressure sensor 4 is set at a preset position, and the measured pressure is equal to the pressure in the blood vessel, and the accuracy is extremely high. At the same time, the diameter of the needle tube 3 can also be reduced as required, thereby avoiding causing a large puncture wound to the patient, alleviating the pain of the patient during the measurement process, and reducing the infection probability of complications.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, apparatus, article or method comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, apparatus, article or method. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, apparatus, article, or method that includes the element.

The above are only the preferred embodiments of the present application, and are not intended to limit the scope of the patent of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present application, or directly or indirectly applied to other related The technical field is similarly included in the scope of patent protection of this application.

Claims (10)

1. An invasive blood pressure measuring device is characterized by comprising a pressure sensor and a pressure measuring pipeline;

when the blood pressure measuring device is used, the pressure measuring pipeline is filled with flowing liquid;

the pressure sensor is arranged at a preset position in the pressure measuring pipeline, wherein the preset position is a position where negative pressure in the pressure measuring pipeline counteracts radial pressure, the negative pressure is pressure generated on the inner surface of a pipe wall when the liquid flows in the pressure measuring pipeline, and the radial pressure is static pressure generated when the liquid flows in the pressure measuring pipeline.

2. The invasive blood pressure measuring device according to claim 1, wherein the pressure measuring line comprises a perfusion tube, a microfluidic tubule, and a needle tube;

the perfusion tube, the micro-fluidic tubule and the needle tube are connected in sequence;

the pressure sensor is arranged at the preset position in the microfluidic tubule.

3. An invasive blood pressure measuring device according to claim 2, wherein the cross-sectional area of the microfluidic tubules is less than 0.05mm²。

4. An invasive blood pressure measuring device according to claim 2, wherein the needle gauge of said needle cannula is no greater than 25 gauge.

5. The invasive blood pressure measuring device according to claim 2, wherein one end of the microfluidic tubule is provided with a standard liquid flow input interface, and the other end is provided with a standard liquid flow output interface;

the micro-fluidic thin tube is connected with the perfusion tube through the standard liquid flow input interface;

the micro-fluidic tubules are connected with the needle tubes through the standard liquid flow output interfaces.

6. An invasive blood pressure measuring device according to claim 1, wherein the pressure sensor comprises 4 strain resistors, and each strain resistor is arranged in a symmetrical manner with respect to the section of the conduit in which the preset position is located.

7. An invasive blood pressure measuring device according to claim 1, wherein said blood pressure measuring device comprises a processor connected to said pressure sensor;

the processor is used for receiving and processing the pressure signal fed back by the pressure sensor.

8. An invasive blood pressure measuring device according to claim 7, further comprising an alarm device connected to said processor;

the alarm device is used for outputting alarm information when the blood pressure value monitored by the pressure sensor is larger than a threshold value.

9. An invasive blood pressure measuring device according to claim 7, further comprising a display device, said display device being connected to said processor;

the display device is used for displaying the blood pressure value and/or the waveform chart monitored by the pressure sensor.

10. An invasive blood pressure measuring device according to claim 7, further comprising a communication device connected to said processor;

and the communication device is used for sending the result of the pressure signal processed by the processor to a preset terminal.

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