Invasive blood pressure sensor

Abstract

The utility model provides an invasive blood pressure sensor. The invasive blood pressure sensor comprises a pipeline; the connecting plug is mounted at one end of the pipeline; the infusion device is mounted at one end, deviating from the connecting plug, of the pipeline; the pressure sensor is arranged in the pipeline and is used for measuring the liquid pressure in the pipeline; and the filter is mounted in the pipeline and is used for filtering the liquid in the pipeline. The filter is arranged in the pipeline to filter small bubbles, air or other impurities of liquid in the pipeline so as to ensure that the measurement of the pressure sensor is not affected, ensure the measurement accuracy of the pressure sensor and ensure that the pressure sensor can measure in time, so that the treatment of a patient is not delayed.

Description

Technical Field

[0001] This application belongs to the technical field of blood pressure detection, and more specifically, relates to an invasive blood pressure sensor. Background Art

[0002] An invasive blood pressure sensor is a medical device used to measure a patient's blood pressure. It inserts the invasive blood pressure sensor into the patient's artery or vein and transmits the blood pressure signal to a monitoring instrument for processing and display. Since the invasive blood pressure sensor needs to be monitored for a long time, some external factors may occur in the pipeline, which affects the measurement accuracy of the invasive blood pressure sensor and delays the treatment of the patient. Summary of the Utility Model

[0003] The purpose of the embodiments of this application is to provide an invasive blood pressure sensor to solve the technical problem of inaccurate measurement of the invasive blood pressure sensor in the existing technology.

[0004] To achieve the above purpose, the technical solution adopted in this application is: to provide an invasive blood pressure sensor, including:

[0005] A pipeline;

[0006] A plug connector installed at one end of the pipeline;

[0007] An infusion device installed at the end of the pipeline away from the plug connector;

[0008] A pressure sensor disposed in the pipeline and used to measure the liquid pressure in the pipeline;

[0009] A filter installed in the pipeline and used to filter the liquid in the pipeline.

[0010] In some embodiments, the filter is located between the pressure sensor and the infusion device.

[0011] In some embodiments, a one-way valve is further provided in the pipeline, and the one-way valve allows the liquid to flow from the infusion device towards the plug connector.

[0012] In some embodiments, the one-way valve is integrally connected with the filter to form a one-way filter.

[0013] In some embodiments, the one-way filter includes a valve seat, a valve body, and a filter element; the valve seat has a liquid passage, and opposite ends of the liquid passage are respectively communicated with the pipeline; the valve body and the filter element are sequentially arranged in the liquid passage.

[0014] In some embodiments, the valve seat has a first chamber and a second chamber. The liquid passage sequentially penetrates through the first chamber and the second chamber. The valve body is disposed in the first chamber, and the filter element is disposed in the second chamber.

[0015] In some embodiments, the liquid passage has an inlet and an outlet. The first chamber has a first inner wall and a second inner wall disposed opposite to each other. The first inner wall communicates with the inlet, and the second inner wall communicates with the outlet. A convex ring protrudes from the first inner wall, and the convex ring surrounds the inlet. The valve body includes a diaphragm, and the diaphragm is movably disposed between the convex ring and the second inner wall, and the middle region of the diaphragm faces the inlet.

[0016] In some embodiments, the valve body includes a diaphragm, and the filter element includes a filter sheet. The area of the filter sheet is more than twice the area of the diaphragm.

[0017] In some embodiments, a limiting ring protrudes from the diaphragm in the direction of the inlet, and the limiting ring is inserted into the convex ring. A connecting groove communicating with the outlet is recessed from the second inner wall in the direction of the outlet, and the maximum inner diameter of the limiting ring is smaller than the inner diameter of the connecting groove.

[0018] In some embodiments, a flow regulator is further provided between the infusion device and the pressure sensor, and the one-way filter is disposed between the flow regulator and the pressure sensor.

[0019] In some embodiments, the one-way valve and the filter are independently provided and are respectively disposed between the infusion device and the pressure sensor.

[0020] The beneficial effects of the invasive blood pressure sensor provided by the present application are as follows: By providing a filter in the pipeline to filter small bubbles, air or other impurities in the liquid in the pipeline, so as to ensure that the measurement of the pressure sensor is not affected, thereby ensuring the measurement accuracy of the pressure sensor, and ensuring that the pressure sensor can measure in a timely manner without delaying the treatment of the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to these drawings.

[0022] Figure 1 is a schematic structural diagram of the invasive blood pressure sensor provided by the embodiment of the present application;

[0023] Figure 2This is a cross-sectional schematic diagram of the one-way filter in the invasive blood pressure sensor provided by the embodiments of the present application.

[0024] Among them, the reference numerals in the figure are as follows:

[0025] 100, pipeline; 200, plug connector; 300, infusion device; 400, pressure sensor; 500, filter; 600, one-way valve; 700, one-way filter; 710, valve seat; 711, liquid channel; 712, first chamber; 7121, first inner wall; 7122, second inner wall; 7123, convex ring; 713, second chamber; 7131, third inner wall; 7132, fourth inner wall; 7133, first rib; 7134, second rib; 714, inlet; 715, outlet; 716, connection groove; 717, connection seat; 718, first cover; 719, second cover; 720, valve body; 721, diaphragm; 722, limit ring; 730, filter element; 731, filter sheet; 800, flow regulator; 900, terminal; 1000, three-way valve. Detailed implementation manners

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0027] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0029] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0030] An invasive blood pressure sensor is a medical device used to measure a patient's blood pressure. It inserts the invasive blood pressure sensor into the patient's artery or vein and transmits the blood pressure signal to a monitoring instrument for processing and display. Invasive blood pressure sensors are commonly used in arteries or central veins and require long-term monitoring. Therefore, air or small bubbles remaining in the pipeline will affect the invasive blood pressure sensor, resulting in untimely or inaccurate readings, thus delaying the treatment of patients.

[0031] To solve the above problems, the embodiments of the present application provide an invasive blood pressure sensor. By providing a filter 500 for filtering air and small bubbles in the pipeline 100, the measurement of the invasive blood pressure sensor by air and small bubbles is avoided, thereby ensuring timely and accurate readings of the invasive blood pressure sensor and not delaying the treatment of patients.

[0032] Please refer to Figure 1 and Figure 2 to describe the invasive blood pressure sensor provided by the embodiments of the present application. The invasive blood pressure sensor includes a pipeline 100, a connector 200, an infusion device 300, a pressure sensor 400, and a filter 500. The connector 200 is installed at one end of the pipeline 100, and the infusion device 300 is installed at the end of the pipeline 100 away from the connector 200; the pressure sensor 400 is disposed in the pipeline 100 and is used to measure the liquid pressure in the pipeline 100; the filter 500 is installed in the pipeline 100 and is used to filter the liquid in the pipeline 100.

[0033] Among them, the connector 200 and the infusion device 300 are respectively installed at opposite ends of the pipeline 100. The connector 200 is used to connect with a indwelling needle inserted into a blood vessel to connect the pipeline 100 with the blood vessel. The infusion device 300 is used to inject liquid into the pipeline 100 to maintain the pressure balance of the entire pipeline 100 to ensure accurate measurement by the pressure sensor 400.

[0034] It should be noted that the pressure sensor 400 is disposed in the pipeline 100, which means that the pressure sensor 400 is disposed in the path of the pipeline 100 and the pressure sensor 400 is connected to the pipeline 100, so that the pressure sensor 400 can accurately measure the pressure value of the liquid in the pipeline 100.

[0035] It should also be noted that the filter 500 is disposed in the pipeline 100, which means that the filter 500 is disposed in the path of the pipeline 100 and the filter 500 is connected to the pipeline 100, so that the liquid flowing through the filter 500 in the pipeline 100 can be filtered by the filter 500 to filter small bubbles, air or other impurities in the liquid to ensure the detection accuracy of the pressure sensor 400.

[0036] In the invasive blood pressure sensor in the embodiments of the present application, a filter 500 is provided in the pipeline 100 to filter small air bubbles, air or other impurities in the liquid in the pipeline 100, so as to ensure that the measurement of the pressure sensor 400 is not affected, thereby ensuring the measurement accuracy of the pressure sensor 400, and ensuring that the pressure sensor 400 can measure in a timely manner without delaying the treatment of the patient.

[0037] In some embodiments, refer to Figure 1 , the filter 500 is located between the pressure sensor 400 and the infusion device 300. In practical applications, the small air bubbles and air in the pipeline 100 mainly enter the pipeline 100 through the infusion device 300, and finally affect the detection result of the pressure sensor 400. In this embodiment, by setting the filter 500 between the pressure sensor 400 and the infusion device 300, the air entering the pipeline 100 from the infusion device 300 and the small air bubbles generated by the air are filtered through the filter 500, thereby ensuring the detection accuracy of the pressure sensor 400. Of course, in other embodiments, a filter 500 can also be provided between the pressure sensor 400 and the plug connector 200, which is not limited uniquely here.

[0038] In some embodiments, refer to Figure 1 , a one-way valve 600 is also provided in the pipeline 100, and the one-way valve 600 allows the liquid to flow from the infusion device 300 towards the plug connector 200.

[0039] In practical applications, when this invasive blood pressure sensor is applied to arterial blood pressure detection, the pressure of the arterial blood is relatively large and prone to backflow. After a long time of backflow, the blood is prone to coagulation, resulting in blockage of the pipeline 100. Subsequently, the instrument needs to be replaced and the blood vessel needs to be punctured again, affecting the treatment process of the patient. In this embodiment, by setting the one-way valve 600 in the pipeline 100, the liquid in the infusion device 300 can flow towards the plug connector 200, but the blood cannot flow from the plug connector 200 to the infusion device 300, thereby preventing the backflow of the liquid medicine or blood, preventing the blockage of the pipeline 100, and eliminating the need to frequently replace the instrument and puncture the blood vessel again, reducing the factors affecting the treatment of the patient.

[0040] In some embodiments, refer to Figure 1 , the one-way valve 600 is located between the pressure sensor 400 and the infusion device 300, that is, the liquid in the infusion device 300 can flow towards the plug connector 200, but the blood can at most flow from the plug connector 200 to the pressure sensor 400, so that the blood and the liquid form a balance at the pressure sensor 400 for convenient pressure measurement. It can be understood that in other embodiments, the one-way valve 600 can also be set between the plug connector 200 and the pressure sensor 400.

[0041] In some embodiments, refer to Figure 1 andFigure 2 The one-way valve 600 is integrally connected to the filter 500 to form a one-way filter 700. That is, the one-way filter 700 not only has the function of filtering bubbles in the liquid, but also has the function of controlling the liquid flow direction. During design, manufacture and assembly, only the one-way filter 700 needs to be designed, manufactured and assembled, reducing the design, manufacture and assembly costs of the entire invasive blood pressure sensor.

[0042] In some embodiments, please refer to Figure 2 The one-way filter 700 includes a valve seat 710, a valve body 720 and a filter element 730; the valve seat 710 has a liquid passage 711, and opposite ends of the liquid passage 711 are respectively communicated with the pipeline 100; the valve body 720 and the filter element 730 are sequentially arranged in the liquid passage 711. In this embodiment, by respectively arranging the valve body 720 and the filter element 730 in the liquid passage 711 of the valve seat 710, wherein the valve body 720 realizes the function of controlling the liquid flow direction, and the filter element 730 realizes the function of filtering bubbles in the liquid, so as to achieve the purpose of integrating the one-way valve 600 and the filter 500 into one.

[0043] As an example, among the valve body 720 and the filter element 730, the valve body 720 is arranged close to the infusion device 300, and the filter element 730 is arranged far from the infusion device 300. In other examples, it may also be that among the valve body 720 and the filter element 730, the filter element 730 is arranged close to the infusion device 300, and the valve body 720 is arranged far from the infusion device 300.

[0044] In some embodiments, please refer to Figure 2 The valve seat 710 has a first chamber 712 and a second chamber 713, the liquid passage 711 sequentially penetrates through the first chamber 712 and the second chamber 713, the valve body 720 is arranged in the first chamber 712, and the filter element 730 is arranged in the second chamber 713.

[0045] In practical applications, in order to ensure that the flow rate of the liquid is consistent at various locations in the pipeline 100 and to ensure that the liquid pressure at various locations in the pipeline is in a stable and consistent state, the inner diameters of various locations in the pipeline 100 are set to be the same. Therefore, it is also necessary to set the inner diameter of the liquid passage 711 in the valve seat 710 to be the same as or close to the inner diameter of the pipeline 100. Then, for one-way control of the liquid and filtering of the liquid, both the valve body 720 and the filter element 730 have certain dimensions. In order to facilitate the installation of the valve body 720 and the filter element 730 in the valve seat 710, a first chamber 712 and a second chamber 713 are provided in the valve seat 710 in this embodiment. The radial dimensions of the first chamber 712 and the second chamber 713 are larger than the radial dimension of the liquid passage 711. The valve body 720 and the filter element 730 are respectively installed in the first chamber 712 and the second chamber 713. At the same time, the liquid passage 711 sequentially penetrates through the first chamber 712 and the second chamber 713, so that the liquid flowing through the valve seat 710 sequentially passes through the valve body 720 and the filter element 730 to achieve the one-way and filtering effects.

[0046] In some embodiments, refer to Figure 2 , the liquid passage 711 has an inlet 714 and an outlet 715. The first chamber 712 has a first inner wall 7121 and a second inner wall 7122 that are oppositely arranged. The first inner wall 7121 communicates with the inlet 714, and the second inner wall 7122 communicates with the outlet 715. A convex ring 7123 protrudes from the first inner wall 7121, and the convex ring 7123 surrounds the inlet 714. The valve body 720 includes a diaphragm 721. The diaphragm 721 is movably arranged between the convex ring 7123 and the second inner wall 7122, and the middle area of the diaphragm 721 is disposed opposite to the inlet 714.

[0047] Among them, the inlet 714 and the outlet 715 are spaced apart along the length extension direction of the liquid passage 711. The inlet 714 refers to the port where the liquid input by the infusion device 300 flows into the liquid passage 711 via the pipeline 100. The outlet 715 refers to the port where the liquid flows out of the liquid passage 711 into the pipeline 100. The first inner wall 7121 and the second inner wall 7122 are spaced apart along the length extension direction of the liquid passage 711, and the first inner wall 7121 is relatively closer to the inlet 714 than the second inner wall 7122, and the second inner wall 7122 is relatively closer to the outlet 715 than the first inner wall 7121.

[0048] When there is liquid flowing into the inlet 714, under the thrust of the liquid, the diaphragm 721 separates from the convex ring 7123, enabling the liquid to enter the first chamber 712 through the gap between the diaphragm 721 and the convex ring 7123. In addition, since the central region of the diaphragm 721 is disposed opposite to the inlet 714, a part of the liquid entering from the inlet 714 directly acts on the central region of the diaphragm 721, causing the diaphragm 721 to bend and protrude towards the outlet 715, so that the diaphragm 721 cannot fit against the second inner wall 7122 due to deformation. Thus, the liquid in the first chamber 712 can flow towards the outlet 715 through the gap between the diaphragm 721 and the second inner wall 7122, thereby realizing the forward flow of the liquid.

[0049] When there is liquid flowing into the outlet 715, the liquid acts on the diaphragm 721 to separate the diaphragm 721 from the second inner wall 7122 and attach it to the convex ring 7123. Since the contact between the diaphragm 721 and the convex ring 7123 is a line-plane contact, the sealing performance between the diaphragm 721 and the convex ring 7123 can be ensured, preventing the liquid from flowing towards the inlet 714 through the gap between the diaphragm 721 and the convex ring 7123, thereby realizing the one-way control of the liquid.

[0050] In some embodiments, referring to Figure 2 , the valve body 720 further includes a limiting ring 722. The diaphragm 721 is circular, and the limiting ring 722 protrudes from the central position on the side of the diaphragm 721 facing the inlet 714. The limiting ring 722 is arranged to be inserted into the convex ring 7123. The setting of the limiting ring 722 can realize the radial positioning of the diaphragm 721, so that one peripheral edge of the diaphragm 721 can abut against the convex ring 7123, and the middle region of the diaphragm 721 can be disposed opposite to the inlet 714.

[0051] Specifically, the inner peripheral surface of the limiting ring 722 is a conical surface. The inner diameter of the limiting ring 722 gradually increases from the diaphragm 721 towards the inlet 714. The minimum inner diameter of the limiting ring 722 is smaller than the inner diameter of the inlet 714, and the maximum inner diameter of the limiting ring 722 is larger than the inner diameter of the inlet 714. The second inner wall 7122 is recessed towards the outlet 715 with a connecting groove 716 communicating with the outlet 715. The limiting ring 722 is disposed opposite to the connecting groove 716, and the maximum inner diameter of the limiting ring 722 is smaller than the inner diameter of the connecting groove 716. With the above settings, when the liquid entering at the inlet 714 acts on the diaphragm 721, due to the setting of the limiting ring 722, only the region of the diaphragm 721 corresponding to the minimum inner diameter of the limiting ring 722 will deform and insert into the connecting groove 716, but the size of this region is smaller than the size of the connecting groove 716, so that there will be a gap between the diaphragm 721 and the second inner wall 7122 for the liquid to flow through.

[0052] In some embodiments, the filter element 730 includes a filter sheet 731. The filter sheet 731 extends perpendicular to the length extension direction of the liquid passage 711, and the area of the filter sheet 731 is greater than twice the area of the diaphragm 721. In this embodiment, by setting the area of the filter sheet 731 to be greater than twice the area of the diaphragm 721, the area of the filter sheet 731 is made large enough, thereby improving the filtering efficiency of the filter sheet 731. It can be understood that in other embodiments of the present application, the area of the filter sheet 731 can be set according to actual filtering needs. The area of the filter sheet 731 can be equal to the area of the diaphragm 721, can be smaller than the area of the diaphragm 721, or can be three times or more than three times the area of the diaphragm 721, and there is no unique limitation here.

[0053] In some embodiments, referring to Figure 2 , the second chamber 713 has a third inner wall 7131 and a fourth inner wall 7132 that are oppositely arranged along the length extension direction of the liquid passage 711. The third inner wall 7131 protrudes a first rib 7133 toward the fourth inner wall 7132, and the fourth inner wall 7132 protrudes a second rib 7134 toward the third inner wall 7131. The filter sheet 731 is disposed between the first rib 7133 and the second rib 7134. Among them, the settings of the first rib 7133 and the second rib 7134 can support the filter sheet 731 to a certain extent, prevent the filter sheet 731 from deforming under the action of the liquid, so that the liquid can enter between the first rib 7133 and the filter sheet 731, and can also enter between the filter sheet 731 and the second rib 7134, thereby realizing the filtering effect of the filter sheet 731 on the liquid.

[0054] In some embodiments, referring to Figure 2 , the valve seat 710 includes a connection seat 717, a first cover 718, and a second cover 719. The first cover 718 and one side of the connection seat 717 are covered with each other and jointly enclose a first chamber 712. The second cover 719 and the other side of the connection seat 717 are covered with each other and jointly enclose a second chamber 713. The liquid passage 711 sequentially penetrates through the first cover 718, the connection seat 717, and the second cover 719. In this embodiment, by dividing the valve seat 710 into the connection seat 717, the first cover 718, and the second cover 719, it is convenient to form the first chamber 712 and the second chamber 713, and at the same time, it is also convenient for the assembly of the valve body 720 and the filter element 730, reducing the manufacturing and assembly costs.

[0055] Optionally, the first cover 718 and the connection seat 717 are integrally formed by ultrasonic welding, and the second cover 719 and the connection seat 717 are integrally formed by ultrasonic welding. It can be understood that in other embodiments, the first cover 718 and the connection seat 717 can also be fixedly connected by bonding or pressing, and the second cover 719 and the connection seat 717 can also be fixedly connected by bonding or pressing.

[0056] In some embodiments, referring to Figure 1 , the invasive blood pressure sensor further includes a flow regulator 800 disposed between the infusion device 300 and the pressure sensor 400, and the flow regulator 800 is configured to adjust the flow rate of the liquid input by the infusion device 300.

[0057] As an example, referring to Figure 1 , the one-way filter 700 is disposed between the flow regulator 800 and the pressure sensor 400. In other examples, the flow control valve may also be disposed between the one-way filter 700 and the pressure sensor 400.

[0058] In some embodiments, referring to Figure 1 , the pressure sensor 400 is connected with a terminal 900, and the terminal 900 is used to connect to a monitor, so as to detect and control the data detected by the pressure sensor 400.

[0059] In some embodiments, referring to Figure 1 , a three-way valve 1000 is provided between the pressure sensor 400 and the plug connector 200. The three-way valve 1000 is mainly used to connect and control the pressure measurement pipeline 100 and related devices. Specifically, the three-way valve 1000 can connect the pressure sensor 400 and the pressure measurement pipeline 100, and can also connect devices such as an infusion device or a syringe. In clinical operations, the three-way valve 1000 can achieve multiple functions. For example, by adjusting the position of the three-way valve 1000, blood extraction and monitoring can be achieved without puncturing the patient's blood vessel again, thereby reducing the patient's pain and the risk of infection. When multi-channel blood pressure monitoring is required, the three-way valve 1000 can connect multiple sensors to achieve fast plugging and branching functions, which helps to improve the monitoring efficiency and ensure the accuracy of different pressure measurement signals. In addition, the three-way valve 1000 may also be used to control the connection of the infusion or blood extraction pipeline 100, facilitating infusion or other medical operations while measuring blood pressure.

[0060] In some embodiments, the infusion device 300, the flow regulator 800, the one-way filter 700, the pressure sensor 400, the three-way valve 1000, and the plug connector 200 are connected by a pipeline 100 using an adhesive process.

[0061] In another embodiment of the present application, the filter 500 and the one-way valve 600 can also be provided separately and installed in the pipeline 100 respectively. Specifically, the filter 500 can be provided between the one-way valve 600 and the infusion device 300. The liquid injected by the infusion device 300 first passes through the filter 500 and then passes through the one-way valve 600 and the pressure sensor 400 in sequence. Alternatively, the one-way valve 600 can also be provided between the filter 500 and the infusion device 300. The liquid injected by the infusion device 300 first passes through the one-way valve 600 and then passes through the filter 500 and the pressure sensor 400 in sequence.

[0062] In some embodiments, when the filter 500 is provided separately, a filtering cavity can be provided in the filter 500, and then the filter sheet 731 can be provided in the filtering cavity. The shape and size of the filtering cavity can be set to be similar to those of the second cavity 713, and the material, shape and size of the filter sheet 731 are the same as those described above.

[0063] Similarly, when the one-way valve 600 is provided separately, a one-way cavity can be provided in the one-way valve 600, and the valve body 720 can be provided in the one-way cavity. The structural shape of the one-way cavity is similar to that of the first cavity 712, and the valve body 720 is the same as the above-mentioned valve body 720.

[0064] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An invasive blood pressure sensor, characterized in that, include: Pipeline; A plug connector installed at one end of the pipeline; An infusion set, mounted on an end of the pipeline away from the plug connector; A pressure sensor is disposed in the pipeline and is used to measure the pressure of the liquid in the pipeline; The filter is installed in the pipeline and is used to filter the liquid in the pipeline.

2. The invasive blood pressure sensor according to claim 1, wherein The filter is located between the pressure sensor and the infusion set.

3. The invasive blood pressure sensor according to claim 1 or 2, characterized in that, A one-way valve is also provided in the pipeline, and the one-way valve allows liquid to flow from the infusion set to the plug connector.

4. The invasive blood pressure sensor according to claim 3, wherein, The one-way valve is integrally connected with the filter to form a one-way filter.

5. The invasive blood pressure sensor according to claim 4, wherein The one-way filter comprises a valve seat, a valve body and a filter element; the valve seat has a liquid channel, and the opposite ends of the liquid channel are respectively connected to the pipeline; the valve body and the filter element are arranged in the liquid channel in sequence.

6. The invasive blood pressure sensor according to claim 5, characterized in that The valve seat has a first cavity and a second cavity, the liquid channel sequentially passes through the first cavity and the second cavity, the valve body is arranged in the first cavity, and the filter element is arranged in the second cavity.

7. The invasive blood pressure sensor according to claim 6, wherein, The liquid channel has an inlet and an outlet, and the first cavity has a first inner wall and a second inner wall arranged opposite to each other, the first inner wall is connected to the inlet, and the second inner wall is connected to the outlet; a convex ring is convexly provided on the first inner wall, and the convex ring is arranged around the inlet; the valve body includes a diaphragm, and the diaphragm is movably arranged between the convex ring and the second inner wall, and the middle area of the diaphragm is arranged opposite to the inlet.

8. The invasive blood pressure sensor according to claim 7, wherein The diaphragm is provided with a limit ring protruding toward the inlet direction, and the limit ring is inserted into the protruding ring; the second inner wall is provided with a connecting groove connected to the outlet in the direction of the outlet, and the maximum inner diameter of the limit ring is smaller than the inner diameter of the connecting groove.

9. The invasive blood pressure sensor according to claim 5, wherein The valve body comprises a diaphragm, the filter element comprises a filter plate, and the area of the filter plate is greater than twice the area of the diaphragm.

10. The invasive blood pressure sensor according to claim 4, characterized in that, A flow regulator is also provided between the infusion set and the pressure sensor, and the one-way filter is provided between the flow regulator and the pressure sensor.

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