Central venous pressure measuring system and measuring method

Abstract

The invention discloses a central venous pressure measuring system which is arranged at one end of a CVC tube in the first direction. The invention belongs to the field of medical instruments. The measuring tube is connected with the CVC tube, and the end, away from the CVC tube, of the measuring tube is connected with a pressure sensor; the catheter is connected with the CVC tube, and the end, away from the CVC tube, of the catheter is connected with the normal saline bag; the first connecting piece is fixedly arranged on the CVC tube and is communicated with the measuring tube and the guide tube; the central processing unit is electrically connected with the pressure sensor; the finger type sphygmomanometer is electrically connected with the central processing unit; wherein the first connecting piece forms a communicating cavity, and the communicating cavity forms three cavity openings in the first direction; a liquid supplementing structure used for supplementing liquid is fixedly arranged at a cavity opening, connected with the guide pipe, of the first connecting piece; an information analysis module is arranged in the central processing unit to analyze information transmitted by the pressure sensor and the finger type sphygmomanometer; the finger type sphygmomanometer is clamped on a finger of a patient to monitor blood pressure of the patient. The central venous pressure measuring system has the beneficial effect that the central venous pressure measuring system capable of automatically supplementing liquid is provided.

Description

Technical Field

[0001] The present application relates to the field of medical instruments, and in particular, to a central venous pressure measurement system. Background Art

[0002] Central venous pressure (CVP) is the pressure at the point where the superior and inferior vena cava enter the right atrium, and is measured by inserting a catheter in the superior and inferior vena cava or the right atrium. Central venous pressure measurement is the most commonly used technology in critical care medicine, and is of great significance for understanding the effective circulating blood volume and cardiac function. Central venous catheterization pressure measurement is often used for patients with dehydration, blood loss and hypovolemia, various types of severe shock, heart failure and low output syndrome, postoperative monitoring of cerebral perfusion pressure after craniocerebral diseases (such as brain tumors, cerebrovascular diseases, etc.), and open-heart surgery with extracorporeal circulation for patients with major heart vessels and other critically ill patients;

[0003] At present, the central venous pressure is mainly measured clinically by manual measurement method: the zero point should be selected before measuring the pressure. When the patient lies flat, the zero point of the pressure gauge should be located at the level of the mid-axillary line of the fourth rib on the right side of the patient; when the patient lies on his side, the zero point of the pressure gauge should be located at the level of the 3rd-4th intercostal space on the right edge of the patient's sternum. Then fill the pressure gauge with liquid, clamp the tee, and connect the pressure gauge with the central vein. When the liquid column slowly drops to a stable position, the number of centimeters of the water column is the central venous pressure. After the measurement, clamp the pressure gauge, open the tee and the infusion set to keep the vein open.

[0004] In actual clinical operation, the calibration process of the zero point position and the entire pressure measurement process are relatively complicated. The central venous pressure is also measured by visual reading. If continuous real-time monitoring is required, it is very cumbersome and labor-intensive. In addition, due to nursing work, it is also necessary to determine how to infuse fluid or whether a fluid infusion experiment is needed based on the central venous pressure and blood pressure.

[0005] Currently, there is no central venous pressure measurement system that is convenient to measure and can automatically replenish fluids or perform fluid replacement experiments. Summary of the invention

[0006] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0007] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a central venous pressure measurement system, which is arranged at one end of a CVC tube along a first direction; comprising:

[0008] A measuring tube, connected to the CVC tube and having an end away from the CVC tube connected to a pressure sensor;

[0009] a catheter connected to the CVC tube and having an end remote from the CVC tube connected to a saline bag;

[0010] A first connecting piece, fixedly disposed on the CVC tube and connected to the measuring tube and the catheter;

[0011] A central processing unit is electrically connected to the pressure sensor;

[0012] a sphygmomanometer, electrically connected to the central processing unit;

[0013] The first connecting piece forms a connecting cavity, and the connecting cavity forms three cavity openings along the first direction; the cavity opening connected to the first connecting piece and the catheter has a fixedly arranged fluid infusion structure for fluid infusion; the central processor has an information analysis module to analyze the information transmitted by the pressure sensor and the sphygmomanometer; the sphygmomanometer is worn on the patient's hand to monitor the patient's blood pressure

[0014] During operation, the CVC tube, the measuring tube and the catheter are connected through the first connecting piece; during measurement, the central venous pressure can be quickly responded to through the pressure sensor, thereby improving the efficiency of measurement; the central venous pressure and blood pressure can be automatically analyzed by the central processing unit so that the information analysis module can automatically determine whether to perform fluid infusion or a fluid infusion experiment; the fluid infusion structure can automatically perform fluid infusion, thereby improving the portability of the operation.

[0015] In some embodiments, the rehydration structure comprises:

[0016] a second connecting member, forming a fluid infusion cavity in communication with the catheter;

[0017] A piston block is movably disposed in the liquid replenishing chamber;

[0018] An electromagnet is fixedly mounted on the second connecting member;

[0019] A magnetic block is fixedly arranged on the piston block;

[0020] A flow monitor is arranged in the fluid infusion cavity;

[0021] The electromagnet is fixedly arranged at one end of the second connecting member close to the physiological saline bag; a first elastic member is arranged between the electromagnet and the magnetic attraction member, and the first elastic member always exerts an elastic force to keep the magnetic attraction block away from the electromagnet.

[0022] In some embodiments, the fluid infusion cavity communicates with the cavity port and the catheter;

[0023] A first one-way valve connected to the catheter is arranged in the fluid infusion cavity, and the first one-way valve always allows the liquid in the catheter to flow through the first one-way valve to the fluid infusion cavity;

[0024] A second one-way valve connected to the cavity port is arranged on the piston block, and the second one-way valve always allows the liquid to flow from the first one-way valve to the cavity port;

[0025] The flow monitor is installed at the first one-way valve to detect the volume of liquid flowing through the first one-way valve.

[0026] In some embodiments, the second connector also includes a color sensor electrically connected to the central processing unit;

[0027] An exhaust valve is arranged on the inner wall of the liquid replenishing chamber and between the piston block and the first one-way valve;

[0028] Among them, the sensing color of the color sensor is red.

[0029] In some embodiments, the communication cavity connects the measuring tube and the CVC tube along a first direction, and the catheter is located between the CVC tube and the measuring tube.

[0030] In some embodiments, a third connecting member is fixedly disposed at one end of the measuring tube away from the first connecting member;

[0031] The third connecting piece forms a pressure measuring chamber connected to the measuring tube;

[0032] An exhaust hole is formed at the end of the pressure measuring chamber away from the measuring tube;

[0033] A gas blocking block is provided on the exhaust hole and connected via a second elastic member;

[0034] The second elastic member always allows the air blocking block to be located in the pressure measuring chamber.

[0035] In some embodiments, a snap ring is provided on the outside of the gas blocking block;

[0036] A groove corresponding to the clamping ring is formed on the inner wall of the exhaust hole;

[0037] A floating block is arranged on the air blocking block.

[0038] In some embodiments, the pressure sensor is disposed within the pressure measuring cavity.

[0039] In some embodiments, the first connector is provided with a solenoid valve in communication with the CVC tube;

[0040] The solenoid valve is electrically connected to the central processing unit.

[0041] A central venous pressure measurement method, applied to the above central venous pressure measurement system, comprises the following steps:

[0042] S1. Before measurement, insert the CVC tube into the cavity with the solenoid valve on the first connector to install the first connector on the CVC tube; insert the measuring tube into the cavity corresponding to the CVC tube; insert the second connector into the cavity between the CVBC tube and the measuring tube and connect the catheter.

[0043] S2. Insert the other end of the measuring tube into the third connecting piece; attach the third connecting piece to the patient's fourth intercostal space at the mid-axillary line; clip the sphygmomanometer on the patient's hand; and start the system.

[0044] S3. During measurement, first open the solenoid valve to connect the CVC tube to the connecting cavity; energize the electromagnet to drive the piston to move, and draw the patient's venous blood into the fluid infusion cavity; the color sensor detects that the liquid in the fluid infusion cavity is red and transmits it to the central processor to start measuring the central venous pressure; if the red color is not captured, an alarm is issued to notify medical staff to further investigate the situation.

[0045] S4. After the blood in the fluid infusion chamber is re-injected into the vein through the piston block, the solenoid valve is closed; the physiological saline is flowed to the pressure measuring chamber through the piston block; after the physiological saline enters the pressure measuring chamber, it can move the float block and discharge the original air in the pressure measuring chamber; after the drainage hole is blocked by the air blocking block, the sensor transmits information to the central processing unit; at this time, the electromagnet is powered off and the solenoid valve is opened; at this time, the physiological saline in the pressure measuring chamber is affected by the central venous pressure to generate hydraulic pressure; the pressure sensor receives the pressure information and transmits it to the central processing unit for data analysis; at the same time, the sphygmomanometer transmits the patient's blood pressure to the central processing unit.

[0046] S5. The data analysis module determines whether to perform fluid infusion or fluid infusion experiment according to the table below based on the patient's central venous pressure and blood pressure.

[0047] The beneficial effect of the present application is that it provides a central venous pressure measurement system specifically for JSXG. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0049] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.

[0050] In the attached picture:

[0051] Figure 1 is a schematic diagram of the overall structure of the central venous pressure measurement system according to the first embodiment of the present application;

[0052] Figure 2 It is the overall half-section diagram of the central venous pressure measurement system;

[0053] Figure 3 is a structural diagram of a first connecting member;

[0054] Figure 4 is a half-section structural diagram of the first connecting member and the second connecting member;

[0055] Figure 5 is a structural diagram of a second connecting member;

[0056] Figure 6 is a half-section structural diagram of the second connecting member;

[0057] Figure 7 is a half-section structural diagram of the third connecting member;

[0058] Figure 8 This is a working principle diagram of the central venous pressure measurement system in Example 1 of the present application.

[0059] Reference numerals:

[0060] 1. CVC tube; 2. Measuring tube; 3. Catheter; 4. First connecting piece; 5. Cavity mouth; 6. Solenoid valve; 7. Second connecting piece; 8. Piston block; 9. Electromagnet; 10. Magnetic block; 11. Flow monitor; 12. Fluid filling chamber; 13. First elastic piece; 14. First one-way valve; 15. Second one-way valve; 16. Color sensor; 17. Third connecting piece; 18. Pressure measuring chamber; 19. Exhaust hole; 20. Air blocking block; 21. Second elastic piece; 22. Snap ring; 23. Groove; 24. Float; 25. Sensor; 26. Connecting chamber. DETAILED DESCRIPTION

[0061] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0062] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0063] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0064] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0065] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0066] Embodiment 1

[0067] Reference Figures 1 to 8 , a central venous pressure measurement system, arranged at one end of a CVC tube 1 along a first direction; comprising: a measuring tube 2, a catheter 3, a first connecting piece 4, a central processing unit, and a sphygmomanometer;

[0068] Specifically, the flow direction of the physiological saline to the patient's vein is defined as a first direction; the first connecting member 4 is fixedly arranged at the end of the CVC tube 1, and the first connecting member 4 forms a connecting cavity 26, and the connecting cavity 26 forms three cavity openings 5 ​​along the first direction; the three cavity openings 5 ​​are respectively fixedly connected to the CVC tube 1, the measuring tube 2 and the catheter 3, and the fixing method can be, for example, a socket connection or a threaded connection for easy disassembly and maintenance; and the connecting cavity 26 connects the measuring tube 2 and the CVC tube 1 along the first direction, and the catheter 3 is located between the CVC tube 1 and the measuring tube 2, so that the CVC tube 1 and the measuring tube 2 can be kept at the same horizontal line when measuring the central venous pressure, thereby ensuring the accuracy of the measurement; a solenoid valve 6 is also arranged between the CVC tube 1 and the catheter 3, and the solenoid valve 6 can realize whether the physiological saline flows into the CVC tube 1. Preferably, the solenoid valve 6 is installed in the cavity where the CVC tube 1 is connected to the first connecting member 4;

[0069] Specifically, a pressure sensor for detecting the pressure inside the measuring tube 2 is provided at the end of the measuring tube 2 away from the first connecting piece 4 to reflect the patient's central venous pressure; the end of the catheter 3 away from the first connecting piece 4 is connected to a saline bag, and the saline bag is filled with saline for fluid replacement for the patient; wherein, the central venous pressure measurement system also includes a sphygmomanometer that can be placed on the patient's finger and monitor the patient's blood pressure. The sphygmomanometer can be a finger test sphygmomanometer, which is an existing product that can be directly purchased on the market. Its working principle has been disclosed and will not be described in detail in this application.

[0070] More specifically, the first connecting member 4 is also provided with a central processing unit electrically connected to the pressure sensor and the finger-type sphygmomanometer; the central processing unit includes an information analysis module, which is used to analyze the received electrical signals of the pressure sensor and the finger-type sphygmomanometer and perform information analysis to determine whether to replenish fluid or adjust the replenishment method; wherein, a replenishment structure electrically connected to the central processing unit is also fixedly provided on the first connecting member 4; through the setting of the above-mentioned scheme, it is possible to comprehensively analyze the relationship between the central venous pressure and the blood pressure through the data analysis module, and start the replenishment structure through the central processing unit to realize automatic replenishment; on the one hand, it can improve the detection efficiency of the central venous pressure, and on the other hand, it can realize automatic replenishment.

[0071] In a more specific optional embodiment, the liquid replenishment structure includes: a second connecting member 7, a piston block 8, an electromagnet 9, a magnetic suction block 10, and a flow monitor 11;

[0072] Specifically, the second connecting member 7 forms a fluid infusion cavity 12 connected to the catheter 3, and the catheter 3 and the cavity opening are connected to the fluid infusion cavity 12 by means of a socket or threaded connection, so that the physiological saline can flow through the fluid infusion cavity 12 and enter the CVC tube 1; the piston block 8 is slidably arranged in the fluid infusion cavity 12 along a first direction, and a magnetic attraction block 10 is installed on the piston block 8; an electromagnet 9 is fixedly arranged at one end of the second connecting member 7 close to the physiological saline catheter 3, and the electromagnet 9 is electrically connected to the central processing unit, and can generate magnetism and attract the magnetic attraction block 10 close to the electromagnet 9 after power is turned on. ; Among them, a first elastic member 13 is arranged between the electromagnet 9 and the magnetic attraction member, and the first elastic member 13 is a spring that can always give the piston block 8 an elastic force away from the electromagnet 9; through the arrangement of the above structure, the central processing unit controls the electromagnet 9 to turn on / off power, so that the piston block 8 can reciprocate in the fluid infusion chamber 12; more specifically, a flow monitor 11 electrically connected to the central processing unit is also arranged in the fluid infusion chamber 12, and the flow monitor 11 can detect the flow of physiological saline entering the detection chamber; in this way, the capacity of the fluid infusion can be detected.

[0073] In a more specific optional implementation scheme, a first one-way valve 14 connected to the catheter 3 is provided in the fluid infusion chamber 12, and the first one-way valve 14 always allows the liquid in the catheter 3 to flow through the first one-way valve 14 to the fluid infusion chamber 12; a second one-way valve 15 connected to the cavity opening is provided on the piston block 8, and the second one-way valve 15 always allows the liquid to flow from the first one-way valve 14 to the cavity opening; a flow monitor 11 is installed at the first one-way valve 14 to detect the flow of liquid flowing through the first one-way valve 14; wherein the second connecting member 7 also has a color sensor 16 electrically connected to the central processing unit, and an exhaust valve is provided on the inner wall of the fluid infusion chamber 12 and between the piston block 8 and the first one-way valve 14; In the figure, the sensing color of the color sensor 16 is red; through the design of the above scheme, the magnetism generated by the electromagnet 9 after being energized first drives the piston to move in the direction close to the catheter 3, at this time, negative pressure can be generated in the CVC tube 1, and the liquid in the patient's body can be extracted into the pressure measuring tube. The color sensor 16 captures the color of the liquid in the pressure measuring tube and transmits the measured information to the central processing unit; if the information analysis module analyzes, it can determine whether the CVC tube 1 is inserted into the patient's vein according to the color of the liquid; for example, if the color of the liquid is red, it can be determined that the CVC tube 1 is inserted into the vein. If it is not red, the central processing unit will notify the medical staff through the alarm to conduct further inspection;

[0074] In the above structure, the exhaust valve is a commonly used exhaust valve on the market, which is an existing product that can be purchased directly. It can exhaust the gas in the pressure measuring chamber 18 when the piston block 8 is close to the catheter 3 to prevent the gas from entering the CVC tube 1; through the arrangement of the first one-way valve 14 and the second one-way valve 15, when the piston block 8 is away from the catheter 3, the first one-way valve 14 opens and the liquid in the physiological saline bag is sucked into the decompression chamber; when the piston block 8 is close to the catheter 3, the second one-way valve 15 opens, so that the liquid can enter the CVC tube 1 through the second one-way valve 15 for fluid replacement.

[0075] In a more specific optional embodiment, a third connecting member 17 is fixedly provided at one end of the measuring tube 2 away from the first connecting member 4, and the third connecting member 17 forms a pressure measuring chamber 18 connected to the measuring tube 2; a pressure sensor is provided in the pressure measuring chamber 18 to detect the hydraulic pressure in the pressure measuring chamber 18; wherein, when pressure measurement is required, the solenoid valve 6 is activated to prevent the liquid from entering the CVC tube 1; at this time, the liquid in the catheter 3 enters the pressure measuring chamber 18;

[0076] Specifically, an exhaust hole 19 is formed at the end of the pressure measuring chamber 18 away from the measuring tube 2; after the liquid enters the pressure measuring chamber 18, the gas in the pressure measuring chamber 18 is discharged from the exhaust hole 19; more specifically, a gas blocking block 20 is provided in the exhaust hole 19, and the gas blocking block 20 is connected to the inner wall of the exhaust hole 19 through a second elastic member 21; the second elastic member 21 is a spring, which gives the gas blocking block 20 elasticity away from the exhaust hole 19; a clamping ring 22 is formed on the outside of the gas blocking block 20, and the clamping ring 22 is made of rubber, silicone, etc., which can be deformed by squeezing with the hole wall of the exhaust hole 19 and seal the exhaust hole 19; the exhaust The inner wall of the air hole 19 forms a ring-shaped groove 23 corresponding to the open loop, and the retaining ring 22 is embedded in the groove 23 after the air blocking block 20 is inserted into the exhaust hole 19; a floating block 24 is arranged on the air blocking block 20, and when the liquid volume in the pressure measuring chamber 18 is full, the floating block 24 will make the air blocking block 20 inserted into the exhaust hole 19; wherein, the third connecting member 17 is located at the end of the exhaust hole 19 and a sensor 25 is arranged, and when the air blocking block 20 is inserted into the exhaust hole 19, it is docked with the sensor 25 to determine that the exhaust is completed; it can be understood that the sensor 25 is electrically connected to the central processing unit so that the central processing unit receives the exhaust completion signal.

[0077] Embodiment 2

[0078] A measurement method for the central venous pressure measurement system applied to the first embodiment comprises the following steps:

[0079] S1. Before measurement, insert the CVC tube 1 into the cavity 5 provided with the solenoid valve 6 on the first connecting piece 4 to install the first connecting piece 4 on the CVC tube 1; insert the measuring tube 2 into the cavity 5 corresponding to the CVC tube 1; insert the second connecting piece 7 into the cavity 5 between the CVBC tube and the measuring tube 2 and connect the catheter 3.

[0080] S2, insert the other end of the measuring tube 2 into the third connecting piece 17; attach the third connecting piece 17 to the patient's fourth intercostal space at the mid-axillary line; clamp the finger sphygmomanometer on the patient's finger; start the system.

[0081] S3. During measurement, the solenoid valve 6 is first opened to connect the CVC tube 1 with the connecting chamber 26; the electromagnet 9 is energized to drive the piston block 8 to move, and the patient's venous blood is drawn into the fluid infusion chamber 12; wherein, if the color sensor 16 captures the red color of the liquid in the fluid infusion chamber 12, it transmits it to the central processor to start measuring the central venous pressure; if the red color is not captured, an alarm is issued to notify the medical staff to further investigate the situation.

[0082] S4. After the blood in the fluid infusion chamber 12 is re-injected into the vein through the piston block 8, the solenoid valve 6 is closed; the physiological saline is flowed to the pressure measuring chamber 18 through the piston block 8; after the physiological saline enters the pressure measuring chamber 18, the float 24 can be moved to discharge the original air in the pressure measuring chamber 18; after the drainage hole is blocked by the air blocking block 20, the sensor 25 transmits information to the central processing unit; at this time, the electromagnet 9 is powered off and the solenoid valve 6 is opened; at this time, the physiological saline in the pressure measuring chamber 18 is acted upon by the central venous pressure to generate hydraulic pressure; the pressure sensor receives the pressure information and transmits it to the central processing unit for data analysis; at the same time, the finger-type sphygmomanometer implements the transmission of the patient's blood pressure to the central processing unit.

[0083] S5. The data analysis module determines whether to perform fluid infusion or fluid infusion experiment according to the table below based on the patient's central venous pressure and blood pressure.

[0084] Embodiment 3

[0085] A method for fluid infusion applied to the central venous pressure measurement system of embodiment 1 comprises the following steps:

[0086] S1. Before rehydration, the information analysis module receives data from the pressure sensor and the finger-type sphygmomanometer and performs data analysis.

[0087] S2. During fluid infusion, the electromagnetic valve 6 and the electromagnet 9 are opened simultaneously to inject the saline in the physiological saline bag into the vein; when the saline is injected into the fluid infusion cavity 12, the flow monitor 11 can monitor the volume of the injected saline and transmit the information to the central processor.

[0088] S3. If the data analysis module concludes that the central venous pressure is normal but the blood pressure is low, a fluid infusion experiment is required. During the fluid infusion experiment, the electromagnet 9 is repeatedly powered on and off to allow saline to be injected into the patient's body in a pulsed form, with an injection volume of 250 ml. After the fluid infusion experiment is completed, the central venous pressure is tested again. If the blood pressure rises but the central venous pressure does not, it is insufficient blood volume. If the blood pressure is not high but the central venous pressure rises by 0.29-0.49 kpa, it is heart failure.

[0089] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. A central venous pressure measurement system, arranged at one end of a CVC tube along a first direction; characterized in that: include: A measuring tube, connected to the CVC tube and having an end away from the CVC tube connected to a pressure sensor; a catheter connected to the CVC tube and having an end remote from the CVC tube connected to a saline bag; A first connecting piece, fixedly disposed on the CVC tube and connected to the measuring tube and the catheter; A central processing unit, electrically connected to the pressure sensor; a sphygmomanometer, electrically connected to the central processing unit; Wherein, the first connecting member forms a connecting cavity, and the connecting cavity forms three cavity openings along the first direction; the cavity opening where the first connecting member is connected to the catheter has a fixedly arranged fluid infusion structure for fluid infusion; the central processor has an information analysis module to analyze the information transmitted by the pressure sensor and the sphygmomanometer; The sphygmomanometer is clamped on the patient's finger to monitor the patient's blood pressure.

2. A central venous pressure measurement system according to claim 1, characterized in that: The fluid replenishment structure comprises: a second connecting member, forming a fluid infusion cavity in communication with the catheter; A piston block is movably disposed in the liquid replenishing chamber; An electromagnet, fixedly disposed on the second connecting member; A magnetic block, fixedly arranged on the piston block; A flow monitor is arranged in the fluid infusion cavity; The electromagnet is fixedly arranged at one end of the second connecting member close to the physiological saline bag; a first elastic member is arranged between the electromagnet and the magnetic attraction member, and the first elastic member always exerts an elastic force on the magnetic attraction block to keep away from the electromagnet.

3. A central venous pressure measurement system according to claim 2, characterized in that: The fluid infusion cavity is connected with the cavity opening and the catheter; A first one-way valve in communication with the catheter is disposed in the fluid infusion cavity, and the first one-way valve always allows the liquid in the catheter to flow through the first one-way valve into the fluid infusion cavity; A second one-way valve in communication with the cavity port is disposed on the piston block, and the second one-way valve always allows the liquid to flow from the first one-way valve to the cavity port; The flow monitor is installed at the first one-way valve to detect the volume of liquid flowing through the first one-way valve.

4. A central venous pressure measurement system according to claim 3, characterized in that: The second connecting member is also provided with a color sensor electrically connected to the central processing unit; An exhaust valve is arranged on the inner wall of the liquid replenishing chamber and between the piston block and the first one-way valve; Wherein, the sensing color of the color sensor is red.

5. A central venous pressure measurement system according to claim 1, characterized in that: The communication cavity connects the measuring tube and the CVC tube along a first direction, and the catheter is located between the CVC tube and the measuring tube.

6. A central venous pressure measurement system according to claim 5, characterized in that: A third connecting piece is fixedly disposed at one end of the measuring tube away from the first connecting piece; The third connecting member forms a pressure measuring chamber connected to the measuring tube; The pressure measuring chamber is provided at an end away from the measuring tube to form an exhaust hole; A gas blocking block is provided on the exhaust hole and connected via a second elastic member; Wherein, the second elastic member always enables the air blocking block to be located in the pressure measuring chamber.

7. A central venous pressure measurement system according to claim 6, characterized in that: A snap ring is arranged on the outer side of the gas blocking block; The inner wall of the exhaust hole is formed with a groove corresponding to the clamp ring; A floating block is arranged on the air blocking block.

8. A central venous pressure measurement system according to claim 7, characterized in that: The pressure sensor is arranged in the pressure measuring cavity.

9. A central venous pressure measurement system according to claim 2, characterized in that: The first connecting member is provided with a solenoid valve in communication with the CVC tube; The solenoid valve is electrically connected to the central processing unit.

10. A method for measuring central venous pressure, characterized in that: A central venous pressure measurement system as described in any one of claims 1 to 9, comprising the following steps: S1. Before measurement, insert the CVC tube into the cavity with the solenoid valve on the first connector to install the first connector on the CVC tube; insert the measuring tube into the cavity corresponding to the CVC tube; insert the second connector into the cavity between the CVBC tube and the measuring tube and connect the catheter; S2, insert the other end of the measuring tube into the third connecting piece; attach the third connecting piece to the patient's fourth intercostal mid-axillary line; wear the sphygmomanometer on the patient's hand; start the system; S3. When measuring, first open the solenoid valve to connect the CVC tube to the connecting cavity; energize the electromagnet to drive the piston block to move, and draw the patient's venous blood into the fluid infusion cavity; among them, the color sensor captures the red color of the liquid in the fluid infusion cavity and transmits it to the central processor to start measuring the central venous pressure; if the red color is not captured, an alarm is issued to notify the medical staff to further investigate the situation; S4, after the blood in the fluid infusion chamber is re-injected into the vein through the piston block, the solenoid valve is closed; the physiological saline flows to the pressure measuring chamber through the piston block; after the physiological saline enters the pressure measuring chamber, the float block can be moved to discharge the original air in the pressure measuring chamber; after the drainage hole is blocked by the air blocking block, the sensor transmits information to the central processor; at this time, the electromagnet is powered off and the solenoid valve is opened; at this time, the physiological saline in the pressure measuring chamber is affected by the central venous pressure to generate hydraulic pressure; the pressure sensor receives the pressure information and transmits it to the central processor for data analysis; at the same time, the sphygmomanometer implements the transmission of the patient's blood pressure to the central processor; S5. The data analysis module determines the rehydration / fluid infusion experiment based on the patient's central venous pressure and blood pressure according to the table below.

Images