Special central venous catheter flow monitor for blood purification

Abstract

The utility model discloses a special central venous catheter flow monitor for blood purification, which comprises a three-way pipe, a flow monitor and a cut-off component, the three-way pipe is sleeved on a main body part of a double-cavity catheter and a first intubation tube and a second intubation tube of the double-cavity catheter, and the double-cavity catheter, the flow monitor and the cut-off component are additionally arranged; during operation, medical staff only need to observe the numerical value of the electronic display on the surface of the pressure monitor, the numerical value on the electronic display is the current flow numerical value in the first intubation tube when the empty needle injector extracts, the medical staff can visually see the flow negative pressure numerical value of the first intubation tube, the function of the catheter is helped to be judged, and the operation efficiency is improved. The problems that dialysis treatment is started when the first cannula does not reach the blood flow required by the machine due to the fact that medical workers are not rich in experience of evaluating the flow of the first cannula, and when the flow of the first cannula is not sufficient, a hemodialysis machine frequently alarms to cause extracorporeal circulation blood coagulation, and unplanned off-machine is caused are solved.

Description

Technical Field

[0001] This utility model relates to the technical field of continuous blood purification therapy, specifically to a central venous catheter flow monitor for blood purification. Background Technology

[0002] Vascular access is essential for hemodialysis. The main routes for central venous catheter placement are the internal jugular vein, femoral vein, and subclavian vein. For patients who require temporary hemodialysis treatment for various reasons or who cannot establish an arteriovenous fistula, the central venous catheter is their lifeline for maintenance hemodialysis.

[0003] When using a central venous catheter, it is necessary to assess the flow rate of the central venous catheter for blood purification. The existing assessment method is to determine whether the flow rate of the catheter can meet the blood flow rate of 160ml / h required for continuous blood purification treatment by having the nursing staff connect the catheter through a 20ml syringe and then aspirate 20ml of blood from the catheter without jamming within 6 seconds.

[0004] However, due to varying levels of experience and seniority among the operating nurses, junior nurses and general ward staff lacking dialysis-related expertise cannot directly understand the catheter flow assessments made by dedicated blood purification nurses based on their own experience. Specific arterial pressure values ​​can only be seen on the hemodialysis machine screen after the patient's catheter is connected. Insufficient catheter flow can trigger frequent alarms on the hemodialysis machine, leading to extracorporeal circulation clotting and unplanned machine termination, thus disrupting the patient's dialysis treatment. Utility Model Content

[0005] The purpose of this invention is to provide a central venous catheter flow monitor specifically designed for blood purification, which facilitates the assessment and monitoring of central venous catheter flow, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a flow monitoring device for a central venous catheter specifically for blood purification, comprising a three-way valve, a flow monitoring device, and a flow-stopping component. The three-way valve is sleeved on the main body of a double-lumen catheter and on the first and second cannulas of the double-lumen catheter, wherein one end of the first and second cannulas respectively protrudes from the other two ends of the three-way valve; one end of the flow monitoring device is connected to the first cannulas, and the end of the flow monitoring device away from the first cannulas is connected to a syringe injector; an electronic display electrically connected to the flow monitoring device is fixedly mounted on one side; the flow-stopping component is installed at both ends of the three-way valve to cut off and release flow from the first and second cannulas; by adding the double-lumen catheter, the flow monitoring device, and the flow-stopping component, medical personnel can conveniently observe the values ​​on the electronic display on the pressure monitoring device during operation. The value on the electronic display during the syringe injection process is the current flow rate value in the first cannulas. This method allows medical personnel to intuitively see the negative pressure value of the first cannulas, helping to determine the catheter function. This method prevents patients from starting dialysis treatment before the required blood flow from the first intubation can be achieved due to insufficient experience in assessing the flow rate of the first intubation cannula. Insufficient flow from the first intubation can also cause frequent alarms in the hemodialysis machine, leading to coagulation in the extracorporeal circulation and unplanned termination of the machine. This method effectively improves the safety of patients during dialysis, reduces the operational hassle for staff, and solves the problem of incorrect judgment caused by insufficient work experience of medical staff.

[0007] Preferably, both ends of the flow monitor are connected to the first insertion tube and the empty needle injector respectively via threaded tubes, which facilitates the installation and disassembly of the flow monitor, the empty needle injector, and the first insertion tube.

[0008] Preferably, the flow-blocking assembly includes mounting rings fixedly disposed at the other two ends of the tee pipe. A fixed clamping block is fixedly disposed on one side of the mounting ring. A mounting groove is formed on one side of the fixed clamping block and on the inner wall of the mounting ring. A movable clamping block is slidably disposed inside the mounting groove. A pressing rod is fixedly disposed on one side of the movable clamping block. The end of the pressing rod away from the movable clamping block passes through the mounting ring and extends outward to be fixedly connected to the pressing handle.

[0009] The interception assembly also includes a positioning hole on one side of the movable clamp block, a positioning block slidably disposed on one side of the positioning hole, a pull rod fixedly disposed on one side of the positioning block, a receiving cavity matching the positioning block being opened on the side wall of the mounting groove, a first spring being sleeved on the inner wall of the receiving cavity and located on the pull rod, and the end of the pull rod away from the positioning block passing through the mounting ring and extending outward therefrom being fixedly connected to the pull ring; this facilitates the interception and release of the first and second intubations by medical personnel.

[0010] Preferably, the fixed clamping block is arc-shaped, and the concave surface of the fixed clamping block is provided with extrusion grooves at equal intervals. The movable clamping block is arc-shaped to match the fixed clamping block, and the convex surface of the movable clamping block is provided with extrusion blocks at equal intervals to match the extrusion grooves, thereby increasing the stability of the clamping of the first and second insertion tubes between the movable clamping block and the fixed clamping block.

[0011] Preferably, a groove is provided on one side of the inner wall of the mounting groove, and a second spring is sleeved inside the groove and on the pressing rod. The two ends of the second spring are fixedly connected to the inside of the groove and one side of the movable clamping block, respectively, to increase the convenience of resetting the movable clamping block.

[0012] Preferably, needle wings are fixed at both ends of the three-way tube and the double-lumen catheter to facilitate the fixation of the three-way tube to the patient's skin using medical tape.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention optimizes existing central venous catheter flow monitoring devices for blood purification by adding a three-way stopcock, flow monitor, and shut-off component. This simplifies operation for medical staff, who only need to observe the values ​​on the electronic display of the pressure monitor. The value displayed during syringe aspiration is the current flow rate in the first inserted catheter. This method allows medical staff to directly see the negative pressure value of the first inserted catheter, aiding in catheter function assessment. It prevents inexperienced staff from initiating dialysis treatment before the required blood flow is reached, which can lead to frequent alarms from the hemodialysis machine, causing extracorporeal circulation clotting and unplanned termination of treatment. This effectively improves patient safety during dialysis, reduces operational complexity for staff, and resolves the problem of incorrect judgments caused by insufficient experience among medical personnel. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the mounting ring in this utility model;

[0017] Figure 3 This is a cross-sectional view of the mounting ring in this utility model;

[0018] Figure 4 In this utility model Figure 3 Exploded view.

[0019] In the diagram: 1. Double-lumen catheter; 2. Three-way tube; 3. First insertion cannula; 4. Second insertion cannula; 5. Flow monitor; 6. Empty syringe; 7. Threaded tube; 8. Mounting ring; 9. Fixed clamping block; 10. Mounting groove; 11. Moving clamping block; 12. Pressing rod; 13. Press handle; 14. Positioning hole; 15. Positioning block; 16. Pull rod; 17. Receiving cavity; 18. Pull ring; 19. Squeezing groove; 20. Squeezing block; 21. First spring; 22. Groove; 23. Second spring; 24. Electronic display. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1

[0022] Please see Figures 1-4 The diagram shows a blood purification-specific central venous catheter flow monitoring device, including a three-way valve 2, a flow monitor 5, and a flow-stopping assembly. The three-way valve 2 is sleeved on the main body of a double-lumen catheter 1 and on the first cannula 3 and the second cannula 4 of the double-lumen catheter 1. One end of the first cannula 3 and the second cannula 4 respectively protrude from the other two ends of the three-way valve 2. One end of the flow monitor 5 is connected to the first cannula 3, and the end of the flow monitor 5 away from the first cannula 3 is connected to a syringe injector 6. An electronic display 24 electrically connected to the flow monitor 5 is fixed on one side. The flow-stopping assembly is installed at both ends of the three-way valve 2 to cut off and release the flow from the first cannula 3 and the second cannula 4.

[0023] Please see Figure 1 The flow monitor 5 shown in the figure is connected to the first insertion tube 3 and the empty needle syringe 6 at both ends through threaded tubes 7 respectively.

[0024] When using the blood purification-specific central venous catheter flow monitor: First, connect one end of the flow monitor 5 to the first cannula 3 via a threaded tube 7, and then connect the other end to the syringe injector 6 via the same threaded tube 7. This establishes the connection between the flow monitor 5 and the arterial end of the first cannula 3. During installation, the flow monitor 5 is connected to the electronic display 24 via a controller, and the electronic display 24 is mounted and fixed on the surface of the flow monitor 5. When assessing the venous catheter flow, the flow-blocking component on the first cannula 3 is opened to ensure the cannula 3 is patent. At this point, the operator simply pulls the syringe injector 6. Pulling the syringe injector 6 causes the blood in the first cannula 3 connected to the arterial end to flow through the flow monitor and into the syringe injector 6. During this process, medical personnel only need to observe the value on the electronic display 24 on the surface of the flow monitor 5. The value on the electronic display 24 during the aspiration process of the syringe injector 6 is the current flow rate in the first cannula 3. This method allows medical personnel to visually observe the negative pressure value of the first cannula 3, helping to determine the catheter's function. This method prevents patients from starting dialysis treatment before the required blood flow from the first cannula (3) is reached due to insufficient experience in assessing the flow rate of the first cannula (3). Insufficient flow from the first cannula (3) can cause frequent alarms in the hemodialysis machine, leading to coagulation in the extracorporeal circulation and unplanned termination of the machine. This method effectively improves the safety of patients during dialysis, reduces the operational hassle for staff, and solves the problem of incorrect judgment caused by insufficient work experience of medical staff.

[0025] Example 2

[0026] Please see Figures 1-4 This embodiment further describes Example 1, including a three-way tube 2, a flow monitor 5, and a flow-blocking assembly. The three-way tube 2 is sleeved on the main body of the double-lumen catheter 1 and on the first insertion tube 3 and the second insertion tube 4 of the double-lumen catheter 1. One end of the first insertion tube 3 and the second insertion tube 4 respectively protrude from the other two ends of the three-way tube 2. One end of the flow monitor 5 is connected to the first insertion tube 3, and the end of the flow monitor 5 away from the first insertion tube 3 is connected to a syringe injector 6. An electronic display 24 electrically connected to the flow monitor 5 is fixedly installed on one side. The flow-blocking assembly is installed at both ends of the three-way tube 2 to block and release the flow from the first insertion tube 3 and the second insertion tube 4.

[0027] Please see Figures 1-4The flow-blocking assembly shown in the figure includes mounting rings 8 fixedly disposed at the other two ends of the three-way pipe 2. A fixed clamping block 9 is fixedly disposed on one side of the inner side of the mounting ring 8. A mounting groove 10 is opened on one side of the fixed clamping block 9 and on the inner wall of the mounting ring 8. A movable clamping block 11 is slidably disposed inside the mounting groove 10. A pressing rod 12 is fixedly disposed on one side of the movable clamping block 11. The end of the pressing rod 12 away from the movable clamping block 11 passes through the mounting ring 8 and extends outward to be fixedly connected to the handle 13.

[0028] Please see Figures 2-4 The flow-blocking assembly shown in the figure also includes a positioning hole 14 opened on one side of the moving clamp 11. A positioning block 15 is slidably provided on one side of the positioning hole 14. A pull rod 16 is fixedly provided on one side of the positioning block 15. A receiving cavity 17 matching the positioning block 15 is opened on the side wall of the mounting groove 10. A first spring 21 is sleeved on the inner wall of the receiving cavity 17 and on the pull rod 16. The end of the pull rod 16 away from the positioning block 15 passes through the mounting ring 8 and extends outward to be fixedly connected to the pull ring 18.

[0029] Please see Figure 3 and Figure 4 The mounting groove 10 in the figure has a groove 22 on one side of its inner wall. A second spring 23 is fitted inside the groove 22 and on the pressing rod 12. The two ends of the second spring 23 are fixedly connected to the inside of the groove 22 and one side of the moving clamp block 11, respectively.

[0030] In this embodiment, flow-blocking components are provided at both ends of the three-way tube 2 away from the double-lumen catheter 1, which can achieve the function of blocking or releasing the blood in the first cannula 3 or the second cannula 4, allowing the blood in the first and second cannulas to flow or stop flowing. In specific use, when it is necessary to block the blood flowing inside the first and second cannulas, the pull ring 18 at one end of the pull rod 16 is pulled. The pull ring 18 drives the pull rod 16 to move. The movement of the pull rod 16 drives the positioning block 15 at the other end to move into the receiving cavity 17. When the positioning block 15 moves into the receiving cavity 17, the first spring 21 is compressed, and the positioning block 15 is pulled out from the positioning hole 14. At this time, the moving clamp 11 loses its limit. Then, the operator presses the handle 13, which pushes the pressing rod 12 to move into the mounting ring 8. When the pressing rod 12 pushes the movable clamp 11 at the other end to move closer to the fixed clamp 9, the second spring 23 is stretched and stores elastic potential energy. When the movable clamp 11 passes the positioning block, the pull ring 18 is released, and the first spring 21 pushes the positioning block 15 out of the storage cavity 17 and limits the movable clamp 11, thus fixing the movable clamp 11. At this time, the first insertion tube 3 or the second insertion tube 4 between the movable clamp 11 and the fixed clamp 9 is squeezed, causing the first and second insertion tubes to deform and stop the blood flow inside them, thus achieving the function of intercepting the blood inside the first and second insertion tubes. At this time, it is convenient for the staff to disassemble the medical devices at one end of the first and second insertion tubes, preventing the blood from flowing out of the patient's body and ensuring the safety of the patient during the treatment process.

[0031] When blood needs to be drained from the first and second cannulas, the pull ring 18 is pulled to retract it into the receiving cavity 17. At this time, the movable clamp 11 loses its limiting position, and the second spring 23 releases its elastic potential energy to drive the movable clamp 11 to reset, causing the movable clamp 11 to separate from the fixed clamp 9. This releases the clamp on the first and second cannulas, allowing blood to flow after the first and second cannulas are connected to the treatment device. After the movable clamp 11 resets, the pull ring 18 is released, and the positioning block 15 enters the positioning hole 14 under the push of the first spring 21. This achieves the limiting and fixing function of the reset movable clamp 11, increasing the stability after the movable clamp 11 and the fixed clamp 9 are separated.

[0032] Example 3

[0033] Please see Figures 1-4This embodiment further illustrates other embodiments, including a three-way tube 2, a flow monitor 5, and a flow-blocking assembly. The three-way tube 2 is sleeved on the main body of the double-lumen catheter 1 and the first insertion tube 3 and the second insertion tube 4 of the double-lumen catheter 1, wherein one end of the first insertion tube 3 and the second insertion tube 4 respectively protrude from the other two ends of the three-way tube 2; one end of the flow monitor 5 is connected to the first insertion tube 3, and the end of the flow monitor 5 away from the first insertion tube 3 is connected to the syringe 6. An electronic display 24 electrically connected to the flow monitor 5 is fixedly provided on one side; the flow-blocking assembly is installed at both ends of the three-way tube 2 to block and release the flow from the first insertion tube 3 and the second insertion tube 4.

[0034] Please see Figure 3 and Figure 4 The fixed clamping block 9 in the figure is arc-shaped, and the concave surface of the fixed clamping block 9 is provided with extrusion grooves 19 at equal intervals. The movable clamping block 11 is arc-shaped to match the fixed clamping block 9, and the convex surface of the movable clamping block 11 is provided with extrusion blocks 20 at equal intervals to match the extrusion grooves 19.

[0035] Please see Figure 1 The two ends of the three-way tube 2 and the double-lumen tube 1 shown in the figure are fixed with needle wings.

[0036] In this embodiment, a compression groove 19 is provided on the concave surface of the fixed clamp block 9 to facilitate compression of the first insertion tube 3 or the second insertion tube 4 when the movable clamp block 11 is pressed close to the fixed clamp block 9. This increases the deformation of the first insertion tube 3 or the second insertion tube 4. Furthermore, a compression block 20 matching the compression groove 19 is provided on the convex surface of the movable clamp block 11. When the movable clamp block 11 is pressed close to the fixed clamp block 9 to compress the first insertion tube 3 or the second insertion tube 4, the compression block 20 can be inserted into the compression groove 19, allowing for multiple bending and compression of the first insertion tube 3 or the second insertion tube 4, thus stopping the blood flow in the first and second insertion tubes. This effectively improves the safety and stability of blood flow interception when the first and second insertion tubes are unsuitable. A needle wing is fixedly sleeved on the outside of the connection between the three-way tube 2 and the double-lumen catheter 1, which facilitates medical personnel to fix it to the patient's skin surface with medical tape, increasing the stability of the three-way tube when worn on the patient.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A blood purification dedicated central venous catheter flow monitor, characterized by, The utility model relates to a kind of medical devices, including: Three-way pipe (2), sleeve is set on the main body portion of double-lumen catheter (1) and the first cannula (3) and the second cannula (4) of double-lumen catheter (1), wherein, first cannula (3) and the one end of the second cannula (4) is respectively by the other two ends of three-way pipe (2) to go out; Flow monitor (5), one end of flow monitor (5) is connected with first cannula (3), the end of flow monitor (5) away from first cannula (3) is connected with air needle injector (6), one side of flow monitor (5) is fixedly provided with electronic display (24) electrically connected with it; Shut-off assembly is installed in the two ends of three-way pipe (2), and the first cannula (3) and the second cannula (4) are shut off and flow.

2. The blood purification dedicated central venous catheter flow monitor according to claim 1, characterized in that, Two ends of flow monitor (5) are respectively connected with first cannula (3) and air needle injector (6) by threaded pipe (7).

3. The blood purification dedicated central venous catheter flow monitor according to claim 1, characterized in that, The shut-off assembly includes mounting ring (8) fixedly provided in the other two ends of three-way pipe (2), the inside one side of mounting ring (8) is fixedly provided with fixed clamp block (9), the one side of fixed clamp block (9) and the inside wall of mounting ring (8) is provided with mounting groove (10), the inside of mounting groove (10) is slidably provided with movable clamp block (11), the one side of movable clamp block (11) is fixedly provided with pressing rod (12), the end of pressing rod (12) away from movable clamp block (11) penetrates mounting ring (8) and extends outward and is fixedly connected with pressing handle (13); The shut-off assembly further includes positioning hole (14) provided in the one side of movable clamp block (11), the one side of positioning hole (14) is slidably provided with positioning block (15), the one side of positioning block (15) is fixedly provided with pull rod (16), the side wall of mounting groove (10) is provided with receiving cavity (17) matched with positioning block (15), the inner wall of receiving cavity (17) and the pull rod (16) are provided with first spring (21), the end of pull rod (16) away from positioning block (15) penetrates mounting ring (8) and extends to the outside thereof and is fixedly connected with pull ring (18).

4. The blood purification dedicated central venous catheter flow monitor according to claim 3, characterized in that, The fixed clamp block (9) is arc-shaped, and the concave surface of the fixed clamp block (9) is equidistantly provided with extrusion grooves (19), the movable clamp block (11) is arc-shaped matched with the fixed clamp block (9), and the convex surface of the movable clamp block (11) is equidistantly provided with extrusion blocks (20) matched with the extrusion grooves (19).

5. The blood purification dedicated central venous catheter flow monitor according to claim 3, characterized in that, The inside wall of mounting groove (10) is provided with recess (22), the inside of recess (22) and the pull rod (12) are provided with second spring (23), and two ends of second spring (23) are fixedly connected with the inside of recess (22) and the one side of movable clamp block (11) respectively.

6. The blood purification dedicated central venous catheter flow monitor of claim 1, wherein, The two ends of three-way pipe (2) and double-lumen catheter (1) are fixedly provided with needle wings.

Images