Device for judging position of catheter in central vein

Abstract

The invention provides a device for judging the position of a catheter in a central vein, relates to the technical field of medical equipment, and solves the technical problem that in the prior art, the flow speed of normal saline is higher than the moving speed of the tip of the catheter, so that an electric signal is transmitted to an electrocardiogram monitor in advance, and the accuracy of position judgment is influenced. The device is arranged; the conductive device is used for connecting the catheter device and establishing electrical connection with an external electrocardiograph monitor; the guide device and the conductive device form stable electrical connection, and the guide device electrically connects the tip of the catheter device with the conductive device, so that the position of the tip of the catheter device is determined according to a wave value displayed by an electrocardiograph monitor in the puncture process of the catheter device; according to the highest peak point of the P wave value, it is determined that the catheter tip position reaches the superior vena cava and right atrium junction (CAJ), it is ensured that the flow speed of normal saline is matched with the movement speed of the catheter tip, and the problem that due to the too high flow speed of normal saline, an electric signal is transmitted to an electrocardiogram monitor in advance is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a device for judging the position of a central venous catheter. Background Art

[0002] Peripherally Inserted Central Catheter (PICC) is a long-term indwelling intravenous infusion tube that is inserted through a peripheral vein and has its catheter tip placed at the superior vena cava or the junction of the superior vena cava and the right atrium (CAJ). Due to its convenience for maintenance and low infection risk, PICC is widely used in clinical practice. Research shows that to ensure the best treatment effect and reduce complications, the optimal tip position of PICC should be at the lower 1 / 3 of the superior vena cava or directly at the junction of the superior vena cava and the right atrium (CAJ).

[0003] Currently, using the change in the P-wave value in Intracardiac Electrogram (ICEG) to judge the catheter insertion depth has become a common method. The specific operation process is as follows: First, one end of a guide wire is connected to the end of the catheter, and the other end is connected to the electrode post of an electrocardiogram patch; then, physiological saline is injected into the catheter, allowing it to flow through the inside of the catheter and out from the catheter tip, forming an electric current loop. According to the monitored change in the P-wave, it is possible to evaluate whether the catheter tip has reached the ideal position.

[0004] However, in the actual application process, the guide wire position judgment system based on electrophysiological signal monitoring faces some challenges. During the insertion process, it is possible that the flow rate of physiological saline is faster than the movement speed of the catheter tip. This means that when physiological saline flows through the front end of the PICC tube to form an electrical conduction path, if its flow rate exceeds the actual forward speed of the catheter tip, it may cause the electrical signal to be transmitted to the electrocardiogram monitor in advance, resulting in misidentification of the P-wave peak value. This phenomenon may mislead the operator into thinking that the PICC catheter tip has reached the target position, thus affecting the accuracy of position judgment and potentially causing unnecessary medical risks.

[0005] Although the existing intracardiac central venous electrocardiogram positioning technology has significantly improved the accuracy and safety of PICC catheterization compared to traditional methods (such as chest X-ray fluoroscopy positioning), this method still has limitations, especially in the precise positioning of the catheter tip. Therefore, it is particularly important to develop more precise and effective positioning methods and technologies, which is of great significance for further improving the safety and success rate of PICC catheterization. This not only helps to improve the treatment effect of patients but also reduces potential medical risks, providing a more reliable tool for medical staff to support their work. Summary of the Invention

[0006] The object of the present invention is to provide a device for judging the position of a central venous catheter, so as to solve the problem in the prior art that the flow rate of physiological saline is faster than the moving speed of the catheter tip, resulting in the premature transmission of the electrical signal to the electrocardiogram monitor, causing misidentification of the P-wave peak value, thereby affecting the accuracy of position judgment. The preferred technical solutions among the many technical solutions provided by the present invention and the many technical effects that can be produced will be described in detail below.

[0007] To achieve the above object, the present invention provides the following technical solutions: A device for judging the position of a central venous catheter, comprising: A catheter device for providing a stable pipeline and capable of being long-term retained in the peripheral vein and the central vein; A conductive device for connecting the catheter device to an external electrocardiogram monitor, so as to establish an electrical connection between the catheter device and the electrocardiogram monitor, so that the electrocardiogram monitor reads the P-wave value fed back by the catheter device during the puncture process of the catheter device along the peripheral vein and the central vein; A diversion device is arranged inside the catheter device and forms a stable electrical signal connection with the conductive device. The diversion device electrically connects the tip of the catheter device and the conductive device, so as to determine the position of the tip of the catheter device according to the wave value shown on the electrocardiogram monitor during the puncture process of the catheter device, and determine that the tip of the catheter reaches the junction of the superior vena cava and the right atrium (CAJ) according to the highest peak point of the P-wave value.

[0008] Further, the catheter device includes a diversion tube and a connector; The diversion tube is used for puncturing from the peripheral vein to the central vein and being long-term retained, and the diversion device is arranged inside the diversion tube and extends to the outside of the diversion tube to form a stable electrical signal connection medium; One end of the diversion tube for puncturing into the central vein is the tip and forms a stable electrical connection with the diversion device. The other end of the diversion tube is fixedly connected to the connector, and the conductive device is installed on the connector to form a firm connection.

[0009] Further, the conductive device includes a guide wire and an electrode piece; One end of the guide wire is fixedly arranged on the connector and electrically connected to the diversion device to form a stable electrical signal connection; The other end of the guide wire is fixedly connected to the electrode piece, and the electrode piece is used for connecting to the input end of the electrocardiogram monitor, so as to transmit the electrical signal at the tip of the diversion tube to the electrocardiogram monitor through the diversion device, the guide wire and the electrode piece.

[0010] Further, the connector includes a three-way pipe and a conductive needle; The three-way pipe is provided with three mutually communicating inner pipe ends, and one through end of the three-way pipe is used for connecting the diversion tube; The two-way end of the three-way pipe is used to connect the diversion device, and the diversion device extends from the two-way end of the three-way pipe through the one-way end and is arranged inside the diversion pipe; The conductive needle is fixedly arranged at the three-way end of the three-way pipe, the end of the three-way end is hermetically arranged, one end of the conductive needle is arranged inside the three-way pipe, and the other end of the conductive needle is arranged outside the three-way pipe and is fixedly connected by a guide wire to form a stable electrical signal connection medium.

[0011] Furthermore, the diversion pipe is a blind pipe with a liquid inlet opened at one end and a sealed end at the other end, and the sealed end of the diversion pipe is a tip for puncturing the junction of the superior vena cava and the right atrium; A liquid outlet is opened on the side wall of the diversion pipe adjacent to the sealed end. During use, the diversion device transports physiological saline from the three-way pipe into the diversion pipe, and the physiological saline filled in the diversion pipe contacts the conductive needle to form a stable conductive medium; The physiological saline is discharged from the liquid outlet, and the liquid outlet is close to the tip, and transmits the electrical signal to the electrocardiogram monitor.

[0012] Furthermore, the distance from the side wall of the liquid outlet close to the sealed end of the diversion pipe to the side wall of the tip of the diversion pipe is not greater than 5 millimeters; The flow rate of the physiological saline transported by the diversion device is not greater than 3 ml / min; The position of the electrical signal transmitted back when the flow rate of the physiological saline flows out of the liquid outlet and is not diluted by blood is exactly the same as the position of the tip of the diversion pipe, and the electrical signal transmitted back is the position where the tip of the diversion pipe is located.

[0013] Furthermore, the diversion device includes an infusion tube and a drip rate regulator; One end of the infusion tube is used to connect the two-way end of the three-way pipe, and the other end of the infusion tube is used to externally connect a physiological saline storage bottle / bag; The drip rate regulator is installed on the infusion tube to control the switch for transporting physiological saline in the infusion tube and to adjust the flow rate of the physiological saline transported by the infusion tube.

[0014] Furthermore, the diversion pipe is a through pipe with two independent diversion chambers opened inside. The diversion chambers are opened from one end of the diversion pipe along its extending direction to the other end and penetrate through the tail end and the tip respectively; The two diversion chambers are respectively a diversion chamber and a conductive chamber. The diversion chamber is used to transport liquid medicine for subsequent treatment; The conductive chamber is used to form a stable conductive medium and is electrically connected to the guide wire, and transmits an electrical signal from the tip of the diversion pipe to the electrocardiogram monitor.

[0015] Furthermore, the diversion device further includes a conductive member fixedly installed inside the conductive cavity of the diversion tube. The conductive member is disposed at the tip position of the diversion tube and seals the tip opening of the conductive cavity. During use, physiological saline is injected into the conductive cavity, and the physiological saline contacts the conductive member to transmit the electrical signal at the tip of the diversion tube to the electrocardiogram monitor.

[0016] Furthermore, the conductive member includes a sealing head made of silicone and silver nanoparticles to achieve the tip sealing of the diversion cavity and to achieve electrical conductivity.

[0017] The central venous catheter position judgment device provided by the present invention significantly improves the accuracy and safety of tip positioning during the PICC (peripherally inserted central catheter) catheterization process through a series of innovative designs. The following are the main technical effects that this device can achieve: Precise electrical signal transmission: By optimizing the design of the diversion device, it is ensured that the flow rate of physiological saline matches the moving speed of the catheter tip, avoiding the problem that the electrical signal is transmitted to the electrocardiogram monitor in advance due to the too fast flow rate of physiological saline. This effectively solves the problem of misidentifying the P wave peak value in the prior art and improves the accuracy of catheter tip position judgment.

[0018] Stable electrical connection: A multi-component conductive system including a guide wire, an electrode patch, and a conductive needle is adopted to ensure that the electrical connection from the catheter tip to the electrocardiogram monitor is both stable and reliable, reducing the problem of signal loss or interference caused by unstable electrical connection.

[0019] Enhanced safety and applicability: By setting the liquid outlet close to the catheter tip and the distance not exceeding 5 mm, and controlling the flow rate of physiological saline not exceeding 3 ml / min, it is ensured that the electrical signal can be correctly transmitted back to the catheter tip before the physiological saline is diluted by blood after flowing out, further enhancing the safety and accuracy of the operation.

[0020] The double-chamber design improves practicability: It is internally provided with an independent diversion cavity and a conductive cavity, which not only meets the requirements of subsequent treatment drug delivery, but also uses the conductive member in the conductive cavity to achieve more stable electrical signal conduction.

[0021] By setting a sealing head made of silicone and silver nanoparticles at the tip of the conductive cavity, it can not only effectively prevent the leakage of physiological saline, ensure the tightness of the system, and avoid the entry of external substances (such as blood) into the conduction path to cause signal interference.

[0022] Silver nanoparticles have extremely high electrical conductivity, and their uniform distribution in silicone can form a stable conductive network, which can ensure good electrical contact even under a small pressure, thereby improving the stability and accuracy of electrical signal transmission.

[0023] Since the sealing head is directly set at the tip of the diversion tube, it can ensure that the physiological saline is sealed in the conductive chamber, so as to accurately transmit the electrical signal to the electrocardiogram monitor at the tip of the diversion tube, further improving the accuracy of judging the position of the catheter tip.

[0024] This design enables the operator to more accurately determine whether the catheter tip reaches the target position (such as the junction of the superior vena cava and the right atrium) according to the change of the P-wave value, reducing the risk of misjudgment and improving the success rate of catheterization.

[0025] The design of the double chamber not only meets the needs of drug delivery in the subsequent treatment process, but also realizes more reliable electrical signal conduction through the independent conductive chamber. This multi-functional integrated design simplifies the device structure and improves the convenience and efficiency of use.

[0026] The diversion chamber is used for liquid medicine delivery, while the conductive chamber focuses on electrical signal conduction. The two do not interfere with each other, ensuring the efficient realization of their respective functions.

[0027] In summary, the central venous catheter position judgment device proposed by the present invention effectively solves the key problems in the current technology through its unique design and innovative technology, greatly improving the safety and success rate in the PICC catheterization process, and is of great significance for improving the treatment effect of patients and reducing medical risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0029] Figure 1 It is a schematic diagram of the overall structure used in Embodiment 1 of the present invention; Figure 2 is Figure 1 The enlarged view of Q in Figure 3 It is a schematic diagram of the overall structure used in Embodiment 2 of the present invention; Figure 4 is Figure 3 The enlarged view of W in

[0030] Explanation of the reference numerals: 100, catheter device; 110, flow guide tube; 111, flow guide cavity; 112, conductive cavity; 120, connector; 121, one-way end; 122, two-way end; 123, three-way end; 124, conductive needle; 130, liquid outlet; 200, conductive device; 210, guide wire; 220, electrode sheet; 300, flow guide device; 310, infusion tube; 320, drip rate device. DETAILED DESCRIPTION

[0031] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that, unless otherwise specified, the meaning of "multiple" is two or more; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The following is combined with Figures 1-4 The present application is further described in detail. An embodiment of the present application discloses a device for determining the position of a central venous catheter.

[0035] Reference Figure 1 and Figure 2 As shown, the present invention provides a device for determining the position of a central venous catheter, comprising a catheter device 100 , a conductive device 200 and a flow guiding device 300 .

[0036] The catheter device 100 is used to provide a stable pipeline and can be left in the peripheral vein and the cardiac lumen for a long time to form an intravenous infusion pipeline. The diversion device 300 is connected and installed at the tip of the catheter device 100 from the tail end of the catheter device 100 to form a stable conductive medium between the tip of the catheter device 100 and the tail end of the catheter device 100. One end of the conductive device 200 is installed at the tail end of the catheter device 100, and the other end is used to connect to an electrocardiogram monitor, so as to establish an electrical connection between the catheter device 100 and the electrocardiogram monitor. Thus, during the puncture process along the peripheral vein and the central vein, the electrocardiogram monitor reads the P-wave value feedback by the catheter device 100. And according to the wave value shown on the electrocardiogram monitor, the tip position of the catheter device 100 is determined, and according to the highest peak point of the P-wave value, it is determined that the catheter tip position reaches the junction of the superior vena cava and the right atrium (CAJ), greatly improving the success rate and accuracy of the catheterization process.

[0037] In this application, a guide wire for ensuring its strength is arranged inside the catheter device to ensure that it will not have problems with difficult penetration due to excessive softness during the penetration process.

[0038] Refer to Figure 1 and Figure 2 As shown, the diversion device 300 includes an infusion tube 310 and a drip rate regulator 320, and the two work together to ensure the efficient operation of the entire system. Specifically, one end of the infusion tube 310 is connected to the catheter device 100, and the other end is connected to an external physiological saline storage bottle or storage bag, so as to realize the function of stably transporting physiological saline into the catheter device 100. This design not only ensures the continuity and stability of the conductive medium, but also improves the safety of the overall device.

[0039] The drip rate regulator 320 is cooperatively installed on the infusion tube 310. This drip rate regulator 320 not only serves as a switch to control the flow of physiological saline to the catheter device 100, but also can accurately adjust the flow rate of physiological saline. By adjusting the drip rate regulator 320, medical staff can easily manage the liquid input rate to ensure that the best treatment effect can be achieved for each operation. In addition, the design of the drip rate regulator 320 takes into account the convenience and accuracy in actual operation, so that even in an emergency, it can respond quickly and make corresponding adjustments.

[0040] It should be noted that the stable conductive medium formed during the catheterization process is crucial for the accurate reading of the electrocardiogram monitor. By using sterile and continuously flowing physiological saline as the conductive medium, the influence of external interference on the transmission of electrical signals can be effectively reduced, thereby improving the accuracy and reliability of the monitoring data.

[0041] The catheter device 100 includes a guiding catheter 110 for threading along the peripheral vein into the central vein for long-term indwelling, and a connector 120 for installing the conductive device 200 and the guiding device 300. This design ensures the stability and reliability of the device in a complex medical environment.

[0042] The guiding catheter 110 is a blind tube with a liquid inlet opened at one end port and the other end sealed, providing a delivery pipeline for physiological extension. That is, one end of the sealed end of the catheter is a tip for puncturing the junction of the superior vena cava and the right atrium. A liquid outlet 130 is provided on the circumferential side wall of the sealed end. The liquid outlet 130 communicates with the inner cavity of the guiding catheter 110, thus providing a reliable intravenous infusion channel when the guiding catheter 110 remains in the peripheral vein and the central vein. In addition, during the puncture process, normal saline flows out through the liquid outlet 130, forming an electrical signal that is transmitted to the electrocardiogram monitor to accurately detect the position reached by the tip of the guiding catheter 110.

[0043] Among them, the length of the liquid outlet 130 is 1 cm, and the opening is a three-way valve type, that is, the valve opens outward when liquid enters the guiding catheter 110, the valve opens inward when the guiding catheter 110 is aspirated during use, and the valve closes when not in use.

[0044] The drip rate regulator 320 is used to adjust the flow rate of normal saline to match the moving speed of the tip of the guiding catheter 110, so that the electrical signal transmitted before the normal saline flows out through the liquid outlet 130 and is diluted by the blood flow is exactly the position where the tip of the guiding catheter 110 is located, thus avoiding the problem of premature transmission of the electrical signal to the electrocardiogram monitor due to too fast a flow rate of normal saline. This innovation not only solves the problem of misidentification of the P-wave peak in the prior art, but also greatly improves the accuracy of judging the position of the catheter tip. This precision is crucial for reducing the risk of misdiagnosis and improving the treatment effect.

[0045] Among them, the distance between the side wall of the liquid outlet 130 close to the sealed end of the guiding catheter 110 and the side wall of the tip of the guiding catheter 110 is not more than 5 mm, and the flow rate of normal saline delivery is not more than 3 ml / min. By carefully adjusting the position of the liquid outlet 130 and strictly controlling the flow rate of normal saline, it helps to improve the accuracy of electrical signal transmission, enabling the electrocardiogram monitor to more accurately monitor the specific position reached by the tip of the guiding catheter 110. By setting the liquid outlet 130 so close to the tip, the interference factors in the electrical signal propagation path can be minimized, thus enhancing the reliability of the monitoring results.

[0046] The flow rate limitation can not only effectively solve the problem of misidentification of the P-wave peak, but also provide a clearer and more accurate electrocardiogram signal for clinicians, thus improving the accuracy of judging the position of the catheter tip and enhancing the safety of the treatment process.

[0047] The connector 120 includes a tee and conductive pins 124. The tee is designed to have three interconnected inner tube ends. This design not only facilitates the fluid transfer between pipes with different functions but also enhances the integration and operational convenience of the entire system. Specifically, one end 121 of the tee is used to firmly connect the diversion tube 110 to ensure the smooth inflow of liquid; while the second end 122 of the tee is specifically used to connect the infusion tube 310 to ensure the smooth delivery of normal saline. The third end, i.e., the tee end 123, is sealed to ensure the stability and sealing performance of the overall structure.

[0048] The conductive pins 124 are fixedly installed at the tee end 123 of the tee. One end is arranged inside the tee, and the other end is arranged outside the tee and is electrically connected to the conductive device 200. Such an arrangement enables when normal saline enters through the infusion tube 310 and is transported through the connector 120 into the diversion tube 110, the conductive pins 124 located inside the tee can quickly contact the normal saline, thereby forming a stable conductive medium path from the tip of the diversion tube 110 to the conductive device 200. This design ensures the efficient transmission of electrical signals and greatly improves the accuracy and reliability of the monitoring data.

[0049] The conductive device 200 includes a guide wire 210 and an electrode plate 220; one end of the guide wire 210 is fixedly arranged on the conductive pin 124 and is electrically connected to the conductive pin 124 to form a stable electrical signal connection. The other end of the guide wire 210 is seamlessly connected to the electrode plate 220 through a reliable welding or crimping process to ensure the continuity and stability of signal transmission. The electrode plate 220, as the last link in signal transmission, its main function is to conduct the electrical signal from the tip of the diversion tube 110 through a series of media such as normal saline, conductive pins 124, and guide wires 210 to the input end of the electrocardiogram monitor.

[0050] This multi-step signal conduction mechanism, using normal saline as the conductive medium, not only simplifies the device structure but also avoids the biocompatibility problems that may be brought by traditional metal wires, thereby enhancing the safety of the overall system and the comfort of patient use.

[0051] In summary, after the catheter device is inserted into the peripheral vein and the central vein, both the diversion device and the conductive device are detached from the catheter device to ensure the subsequent formation of a stable intravenous infusion pipeline for the catheter device. Thus, through the synergistic effect of the above components, the present invention not only optimizes the technical performance of the central venous catheter position judgment device but also significantly improves its practical value and safety in clinical applications.

[0052] Embodiment 2 The main difference between this embodiment and Embodiment 1 lies in the different structural designs of the diversion tube 110.

[0053] Reference Figure 3 and Figure 4 As shown, the conductive device 200 further includes a conductive member, and two independent flow guide chambers - namely, the flow guide chamber 111 and the conductive chamber 112 - are provided inside the flow guide tube 110 of the conductive member. These two chambers extend from one end of the flow guide tube 110 to the other end along its extension direction, and are respectively connected to the tail end and the tip end of the flow guide tube 110.

[0054] The flow guide chamber 111 is used to transport liquid medicine during subsequent treatment processes, while the conductive chamber 112 is connected through a tee tube and is specifically used to inject physiological saline into the conductive chamber 112 as a conductive medium. This double-chamber design not only separates drug delivery from electrical signal conduction but also improves the reliability and operational convenience of the system.

[0055] At the tip of the conductive chamber 112, a conductive member is used for plugging, thereby forming a sealed chamber with one end closed and the other end connected to the tee tube. When the conductive chamber 112 is filled with physiological saline, the electrical signal is obtained by the conductive member at the tip of the flow guide tube 110 and is transmitted to the conductive needle 124, the guide wire 210, and the electrode patch 220 through the conductive medium of physiological saline, and finally transmitted to the electrocardiogram monitor.

[0056] Using the conductive member to seal the conductive chamber 112 can effectively prevent the leakage of physiological saline into the blood, avoiding the problem of inaccurate electrical signal transmission caused by the dilution of physiological saline, and thus ensuring the accuracy of the detection point. This enables the tip of the flow guide tube 110 to more accurately transmit the electrical signal to the electrocardiogram monitor, significantly improving the accuracy of judging the position of the catheter tip.

[0057] In addition, the conductive member uses a sealing head made of silicone and silver nanoparticles, which not only effectively seals the tip of the flow guide chamber 111 but also maintains good electrical conductivity. This material selection not only enhances the sealing effect but also reduces the influence of external interference on the electrical signal, further improving the overall performance of the system.

[0058] The sealing head made of silicone and silver nanoparticles has excellent biocompatibility, reducing the risk of allergic reactions in patients. At the same time, silver nanoparticles also have antibacterial effects, helping to prevent infections and ensuring the safety and reliability of the medical process. Through these precise designs, the entire system not only achieves efficient and stable electrical signal transmission but also greatly improves the safety and effectiveness in clinical applications.

[0059] The above description is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A device for judging the position of a central venous catheter, characterized in that, Comprising: A catheter device (100) for providing a stable pipeline and capable of being long-term retained in the peripheral vein and central vein; A conductive device (200) for connecting the catheter device (100) to an external electrocardiogram monitor, so as to establish an electrical connection between the catheter device (100) and the electrocardiogram monitor, whereby the electrocardiogram monitor reads the P-wave value fed back by the catheter device (100) during the puncture process along the peripheral vein and central vein; A diversion device (300) is arranged inside the catheter device (100) and forms a stable electrical signal connection with the conductive device (200). The diversion device (300) electrically connects the tip of the catheter device (100) to the conductive device (200), thereby determining the tip position of the catheter device (100) according to the wave value shown on the electrocardiogram monitor during the puncture process of the catheter device (100), and determining that the tip position of the catheter reaches the junction of the superior vena cava and the right atrium (CAJ) according to the highest peak point of the P-wave value.

2. The central venous catheter position determination device according to claim 1, characterized in that, The catheter device (100) includes a guide tube (110) and a connector (120); The guide tube (110) is used for puncturing along the peripheral vein to the central vein and for long-term retention, and the diversion device (300) is arranged inside the guide tube (110) and extends to the outside of the guide tube (110) to form a stable electrical signal connection medium; One end of the guide tube (110) for puncturing into the central vein is the tip and forms a stable electrical connection with the diversion device (300). The other end of the guide tube (110) is fixedly connected to the connector (120), and the conductive device (200) is installed on the connector (120) to form a firm connection.

3. The central venous catheter position determination device according to claim 2, characterized in that, The conductive device (200) includes a guide wire (210) and an electrode plate (220); One end of the guide wire (210) is fixedly arranged on the connector (120) and is electrically connected to the diversion device (300) to form a stable electrical signal connection; The other end of the guide wire (210) is fixedly connected to the electrode plate (220). The electrode plate (220) is used for connecting to the input end of the electrocardiogram monitor, so as to transmit the electrical signal at the tip of the guide tube (110) to the electrocardiogram monitor through the diversion device (300), the guide wire (210) and the electrode plate (220).

4. The central venous catheter position determination device according to claim 3, wherein The connector (120) includes a three-way tube and a conductive needle (124); The three-way tube is provided with three mutually communicating inner tube ends. One through end (121) of the three-way tube is used for connecting the guide tube (110); The second through end (122) of the three-way tube is used for connecting the diversion device (300). The diversion device (300) extends from the second through end (122) of the three-way tube through the first through end (121) and is arranged inside the guide tube (110); The conductive needle (124) is fixedly arranged at the third through end (123) of the three-way tube. The end of the third through end (123) is hermetically arranged. One end of the conductive needle (124) is arranged inside the three-way tube, and the other end of the conductive needle (124) is arranged outside the three-way tube and is fixedly connected to the guide wire (210) to form a stable electrical signal connection medium.

5. The central venous catheter position determination device according to claim 4, characterized in that the diversion tube (110) is a blind tube with a liquid inlet opened at one end and sealed at the other end, and the sealed end of the diversion tube (110) is a tip for puncturing the junction of the superior vena cava and the right atrium; a liquid outlet (130) is opened on the side wall of the diversion tube (110) adjacent to the sealed end. During use, the diversion device (300) transports physiological saline into the diversion tube (110) through a three-way tube, and the physiological saline filled in the diversion tube (110) contacts the conductive needle (124) to form a stable conductive medium; the physiological saline is discharged from the liquid outlet (130), and the liquid outlet (130) is close to the tip, and transmits an electrical signal to the electrocardiogram monitor.

6. The central venous catheter position determination device according to claim 5, wherein, the distance from the side wall of the liquid outlet (130) close to the sealed end of the diversion tube (110) to the side wall of the tip of the diversion tube (110) is not greater than 5 mm; the flow rate of the physiological saline transported by the diversion device (300) is not greater than 3 ml / min; the position of the electrical signal transmitted back when the flow rate of the physiological saline flows out of the liquid outlet (130) and is not diluted by blood is exactly the same as the position of the tip of the diversion tube (110), and the electrical signal transmitted back is the position where the tip of the diversion tube (110) is located.

7. The central venous catheter position determination device according to claim 6, characterized in that, the diversion device (300) includes an infusion tube (310) and a drip rate controller (320); one end of the infusion tube (310) is used to connect to the two-way end (122) of the three-way tube, and the other end of the infusion tube (310) is used to externally connect to a physiological saline storage bottle / bag; the drip rate controller (320) is installed on the infusion tube (310) to control the switch for transporting physiological saline in the infusion tube (310) and adjust the flow rate of the physiological saline transported by the infusion tube (310).

8. The central venous catheter position determination device according to claim 1, characterized in that, the diversion tube (110) is a through tube with two independent diversion chambers (111) opened inside. The diversion chambers (111) are opened from one end of the diversion tube (110) along its extension direction to the other end, and penetrate through the tail end and the tip respectively; the two diversion chambers (111) are respectively a diversion chamber (111) and a conductive chamber (112). The diversion chamber (111) is used to transport liquid medicine for subsequent treatment; the conductive chamber (112) is used to form a stable conductive medium and is electrically connected to the guide wire (210), and transmits an electrical signal from the tip of the diversion tube (110) to the electrocardiogram monitor.

9. The central venous catheter position determination device according to claim 8, characterized in that, the diversion device (300) further includes a conductive member fixedly installed inside the conductive chamber (112) of the diversion tube (110). The conductive member is arranged at the tip position of the diversion tube (110) and blocks the tip opening of the conductive chamber (112). During use, physiological saline is injected into the conductive chamber (112), and the physiological saline contacts the conductive member to transmit the electrical signal at the tip of the diversion tube (110) to the electrocardiogram monitor.

10. The central venous catheter position determination device according to claim 9, characterized in that, The conductive member includes a sealing head made of silica gel and silver nanoparticles to achieve the tip sealing of the diversion chamber (111) and achieve conductivity.

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