Flushing device for central venous catheter

Abstract

The invention discloses a central venous catheter flushing device which comprises an injection unit, a liquid storage unit, a connecting channel, a catheter assembly, a flow stopping assembly and a timing driving mechanism. The liquid storage unit is a liquid storage cavity used for storing flushing liquid; the connecting channel is arranged between the injection unit and the liquid storage unit, and a liquid outlet port is formed in the connecting channel; the catheter assembly is used for being connected into a central venous catheter. The flow stopping assembly comprises a flow stopping plug capable of axially sliding, the flow stopping plug is arranged in the connecting channel in a sealed mode and located between the liquid outlet port and the liquid storage unit in an initial state to block communication of the liquid outlet port and the liquid storage unit, and the timing driving mechanism is in linkage with the flow stopping assembly and used for driving the flow stopping plug to move towards the injection unit after a preset time interval. And the liquid storage unit is communicated with the liquid outlet port, so that the central venous catheter is periodically flushed by the flushing liquid. According to the flushing device for the central venous catheter, the catheter can be flushed regularly within the specified time, manual midway intervention is not needed, and therefore the injection effect and the absorption effect of medicine are improved.

Description

Technical Field

[0001] The present invention specifically relates to a central venous catheter flushing device. Background Art

[0002] In clinical practice, a central venous catheter (CVC) is an important medical device used to deliver drugs or fluids into a patient's body. Its operation process generally includes the following steps: medical staff insert the end port of the central venous catheter into the patient's blood vessel, and then connect a syringe loaded with drugs or an infusion pump to the head end of the central venous catheter. Under the action of external pressure, the drug passes through the head end, catheter lumen, and end port of the central venous catheter in sequence, and finally enters the patient's blood circulation system to achieve the treatment purpose.

[0003] After the drug infusion is completed, in order to ensure that there is no residual drug or blood in the central venous catheter, medical staff need to use a syringe loaded with normal saline to flush the catheter. This step aims to remove the drug residues and blood components attached to the inner wall of the catheter, so as to ensure that the drug completely enters the patient's body and avoid complications such as catheter blockage or infection. After flushing, medical staff can safely remove the central venous catheter from the patient's blood vessel.

[0004] In addition, when using a micro-infusion pump or an infusion pump for drug infusion, due to the extremely low infusion rate of some drugs (for example, the infusion rate of octreotide is 2 ml / hour, and the infusion rate of omeprazole is 4 ml / hour), the central venous catheter is prone to blockage. At present, the clinical practice usually adopts the method of timed flushing to prevent catheter blockage. For example, every 3 - 4 hours, 5 - 10 ml of normal saline is used to flush the catheter. However, this method relying on manual timing and operation has problems such as low efficiency, cumbersome operation, and human error, and there is an urgent need for a more efficient and accurate solution. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a central venous catheter flushing device, which can regularly flush the catheter within a specified time without manual intervention in the middle, thereby improving the injection effect and absorption effect of the drug.

[0006] To achieve the above object, the present invention is realized by the following technical solutions: A central venous catheter flushing device, comprising:

[0007] An injection unit, arranged vertically, including an injection cavity for accommodating a liquid medicine, and a connection interface adapted to an external syringe is provided at the top of the injection cavity;

[0008] A liquid storage unit, arranged vertically, including a liquid storage cavity for storing a flushing liquid;

[0009] A connecting channel, which is horizontally arranged between the injection unit and the liquid storage unit, and a liquid outlet port fluidly connected to the liquid storage unit is provided on one side close to the bottom;

[0010] A catheter assembly, which is hermetically connected to the liquid outlet port and is used for accessing a central venous catheter;

[0011] A flow stop assembly, which includes an axially slidable flow stop plug, the flow stop plug is hermetically arranged in the connecting channel, and in the initial state, it is located between the liquid outlet port and the liquid storage unit to block the communication between the two;

[0012] A timing drive mechanism, which is linked with the flow stop assembly and is used for driving the flow stop plug to move towards the injection unit direction after a preset time interval, so that the liquid storage unit is communicated with the liquid outlet port, and the periodic flushing of the central venous catheter by the flushing liquid is realized.

[0013] Further, the timing drive mechanism includes:

[0014] A first return spring, which is arranged in the connecting channel and is connected to the flow stop plug;

[0015] A piston assembly, which is slidably arranged in the liquid storage unit, a liquid replenishing port and a liquid replenishing valve are provided on the side wall of the liquid storage unit, and the liquid replenishing port is located between the piston assembly and the flow stop plug;

[0016] A liquid replenishing unit, which is communicated with the liquid replenishing port of the liquid storage unit through a liquid replenishing channel;

[0017] A drive link, which is fixed to the top of the piston assembly;

[0018] A linear drive, which is connected to the drive link and is used for periodically driving the piston assembly to move downward to compress the flushing liquid in the liquid storage unit, and pushing the flow stop plug to displace through hydraulic pressure.

[0019] Further, the timing drive mechanism further includes a second return spring, the second return spring supports on the piston assembly, and when the second return spring is in the natural state, the piston assembly is located at a position close to the top end of the liquid storage unit.

[0020] Further, a limit block is arranged in the connecting channel, and the limit block is fixed to the inner wall of the connecting channel and is used for restricting the displacement of the flow stop plug towards the liquid storage unit direction.

[0021] Further, the linear drive can drive the piston assembly to move up and down multiple times within each cycle of driving the piston assembly to move downward, so as to enhance the pulse effect of the flushing liquid flow.

[0022] Further, the linear driver is a stepper motor or an electromagnetic linear actuator, and its control module is configured to trigger a driving action according to a preset period.

[0023] Further, the linear driver includes a mechanical transmission assembly, and the mechanical transmission assembly includes:

[0024] A main gear;

[0025] A rotary driver with a mounting disc provided at the output end;

[0026] Teeth, a plurality of the teeth are circumferentially spaced on a part of the outer edge of the mounting disc, and the mounting disc and the main gear are used to drive the main gear to rotate periodically;

[0027] A toggle disc, coaxially fixed on the rotating shaft of the main gear, and toggle teeth are circumferentially spaced thereon; and

[0028] A lever assembly, rotatably arranged through a hinged support frame, one end of which is slidably hinged to a driving link, and the other end extends to the rotation path of the toggle disc;

[0029] Wherein, during the rotation, the toggle teeth sequentially abut against and lift the lever assembly to drive the piston assembly to move downward.

[0030] Further, the mechanical transmission assembly further includes an acceleration gear assembly, and the acceleration gear assembly includes at least two stages of speed increasing gear pairs for increasing the output speed of the rotary driver by a preset ratio and then transmitting it to the toggle disc.

[0031] Further, a one-way valve is integrated in the connection channel, and the one-way valve only allows the flushing liquid to flow from the liquid storage unit to the liquid outlet port.

[0032] Advantages of the present invention:

[0033] When the above central venous catheter flushing device is in use, the injection unit injects normally into the central venous catheter. After each injection reaches a specified time, such as 2 hours later, or 3 hours later, 4 hours later, the timing drive mechanism drives the timing stop plug to move towards the injection unit, so that the liquid storage unit is communicated with the liquid outlet port, realizing the periodic flushing of the central venous catheter with the flushing liquid.

[0034] By adopting the above central venous catheter flushing device, on-line flushing of the central venous catheter can be realized during the intravenous injection process. At the same time, during the flushing process, no manual intervention is required, which can not only save manpower, but also avoid the situation that the injection liquid fails to be injected into the human body in time due to human forgetting, thus affecting the treatment effect. Description of the Drawings

[0035] To more clearly illustrate the specific embodiments of the present invention, the following will briefly introduce the drawings required for the specific embodiments. In all the drawings, the components or parts are not necessarily drawn to actual scale.

[0036] Figure 1 Schematic diagram of a central venous catheter flushing device provided by an embodiment of the present invention;

[0037] Figure 2 For Figure 1 Schematic diagram of the lever assembly pressing down in the central venous catheter flushing device shown;

[0038] Figure 3 For Figure 1 Schematic diagram of the state where the teeth and the acceleration gear assembly in the central venous catheter flushing device shown are not engaged and the piston assembly is in the high position;

[0039] Reference numerals:

[0040] 1. Venous catheter;

[0041] 100. Injection unit; 200. Liquid storage unit; 300. Connection channel; 310. Blocking block; 400. Flow stop assembly; 500. Timing drive mechanism; 510. First return spring; 520. Piston assembly; 530. Liquid replenishment unit; 540. Drive link; 550. Linear driver; 551. Main gear; 552. Rotary driver; 553. Teeth; 554. Dial; 555. Lever assembly; 556. Acceleration gear assembly; 560. Second return spring. Specific embodiments

[0042] To make the above objects, features and advantages of the present invention more obvious and understandable, the following will give a detailed description of the specific embodiments of the present invention with reference to the drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0043] Please refer to Figures 1 to 3 , the present invention provides a central venous catheter flushing device, including an injection unit 100, a liquid storage unit 200, a connection channel 300, a catheter assembly, a flow stop assembly 400 and a timing drive mechanism 500.

[0044] Specifically, the injection unit 100 is arranged vertically and includes an injection cavity for accommodating the liquid medicine. A connection interface adapted to an external syringe is provided at the top of the injection cavity. The liquid storage unit 200 is arranged vertically and includes a liquid storage cavity for storing the flushing liquid. The connection channel 300 is arranged horizontally between the injection unit 100 and the liquid storage unit 200, and a liquid outlet port fluidly connected to the liquid storage unit 200 is provided on one side near the bottom thereof.

[0045] The catheter assembly is sealingly connected to the liquid outlet port and is used for accessing the central venous catheter 1. The flow stop assembly 400 includes an axially slidable flow stop plug, which is sealingly arranged in the connection channel 300 and is located between the liquid outlet port and the liquid storage unit 200 in the initial state to block the communication between the two.

[0046] The timing drive mechanism 500 is linked with the flow stop assembly 400 and is used for driving the flow stop plug to move towards the injection unit 100 after a preset time interval, so that the liquid storage unit 200 is communicated with the liquid outlet port, and periodic flushing of the central venous catheter 1 by the flushing liquid is realized.

[0047] During use, the injection unit 100 injects normally into the central venous catheter 1. After each injection reaches a specified time, such as after 2 hours, or 3 hours, or 4 hours, the timing drive mechanism 500 drives the timing flow stop plug to move towards the injection unit 100, so that the liquid storage unit 200 is communicated with the liquid outlet port, and periodic flushing of the central venous catheter 1 by the flushing liquid is realized.

[0048] By adopting the above central venous catheter flushing device, on-line flushing of the central venous catheter 1 can be realized during the injection process. At the same time, during the flushing process, no manual intervention is required, which can not only save manpower, but also avoid the situation that the injection liquid fails to be injected into the human body in time due to human forgetting, thus affecting the treatment effect.

[0049] In this embodiment, the timing drive mechanism 500 includes a first return spring 510, a piston assembly 520, a liquid replenishing unit 530, a drive link 540 and a linear drive 550.

[0050] Specifically, the first return spring 510 is arranged in the connection channel 300 and is connected to the flow stop plug. The piston assembly 520 is slidably arranged in the liquid storage unit 200. A liquid replenishing port and a liquid replenishing valve are provided on the side wall of the liquid storage unit 200, and the liquid replenishing port is located between the piston assembly 520 and the flow stop plug. The liquid replenishing unit 530 is communicated with the liquid replenishing port of the liquid storage unit 200 through a liquid replenishing channel; the drive link 540 is fixed to the top of the piston assembly 520. The linear drive 550 is connected to the drive link 540 and is used for periodically driving the piston assembly 520 to move downward to compress the flushing liquid in the liquid storage unit 200 and push the flow stop plug to displace through hydraulic pressure.

[0051] In use, when flushing is required, the linear drive 550 drives the piston assembly 520 to move downward to compress the flushing liquid in the liquid storage unit 200, thereby hydraulically pushing the stop plug to displace until the liquid outlet port communicates with the liquid storage unit 200. In addition, the channel between the injection unit 100 and the liquid outlet port is blocked, and the flushing liquid in the liquid storage unit 200 flows into the catheter assembly from the liquid outlet port until it flows into the central venous catheter 1 to flush the central venous catheter 1. When the flushing of this cycle is completed, the linear drive 550 drives the piston assembly 520 to move upward, the hydraulic pressure is released, and under the elastic force of the first return spring 510, the stop plug flushes back to its original position, and then normal infusion operation can be carried out.

[0052] As a preferred embodiment, the timing drive mechanism 500 further includes a second return spring 560. The second return spring 560 is supported on the piston assembly 520. When the second return spring 560 is in its natural state, the piston assembly 520 is located at a position close to the top end of the liquid storage unit 200. Through the second return spring 560, the piston assembly 520 is ensured to return to its original position.

[0053] In addition, a limit block 310 can be provided in the connection channel 300. The limit block 310 is fixed to the inner wall of the connection channel 300 and is used to limit the displacement of the stop plug in the direction of the liquid storage unit 200. To prevent the stop plug from moving excessively in the direction of the liquid storage unit 200.

[0054] As a preferred embodiment, in specific implementation, the linear drive 550 can be configured to drive the piston assembly 520 to move up and down multiple times within each cycle of driving the piston assembly 520 to move downward, so as to enhance the pulsed effect of the flushing liquid flow. Through the pulsed effect, the flushing liquid that needs to be injected in each cycle can be divided into multiple pulsed injections, thereby improving the flushing effect. For example: when 8 milliliters of flushing is required per cycle, the number of pulses can be set to 4 times, and 2 milliliters are flushed each time; when 10 milliliters of flushing is required per cycle, the number of pulses can be set to 5 times, and 2 milliliters are flushed each time.

[0055] In specific implementation, the linear drive 550 can be a stepper motor or an electromagnetic linear actuator, and its control module is configured to trigger a driving action according to a preset cycle. In specific implementation, the control module can be configured to trigger the driving action in a manner of a microprocessor according to a preset cycle.

[0056] In addition, the linear drive 550 can include a mechanical transmission assembly. The mechanical transmission assembly includes a main gear 551, a rotary drive 552, teeth 553, a dial 554, and a lever assembly 555.

[0057] Specifically, a mounting plate is provided at the output end of the rotary driver 552. A plurality of teeth 553 are distributed circumferentially at intervals on the outer edge of the mounting plate portion, and the mounting plate and the main gear 551 drive the main gear 551 to rotate periodically. The toggle plate 554 is coaxially fixed on the rotating shaft of the main gear 551, and toggle teeth are distributed circumferentially at intervals. The lever assembly 555 is rotatably arranged through an articulated support frame, one end of which is slidably hinged to the driving connecting rod 540, and the other end extends to the rotation path of the toggle plate 554. The toggle teeth sequentially abut and lift the lever assembly 555 during the rotation process, driving the piston assembly 520 to move downward.

[0058] When in use, the rotary driver 552 can be set to drive the mounting disk to rotate one circle every 2 hours or 4 hours. Every time it rotates one circle, when the tooth 553 engages with the main gear 551, the main gear 551 can be driven to rotate, and at the same time, the toggle disk 554 can be driven to rotate. During the rotation process, the toggle teeth successively abut and lift the lever assembly 555, driving the piston assembly 520 to move downward, so that multiple liquid extraction and injection actions can be performed, and a pulse effect can be achieved in a flushing cycle, thereby enhancing the flushing effect.

[0059] As a more preferred embodiment, in the specific implementation, the mechanical transmission assembly also includes an acceleration gear assembly 556, which includes at least two-stage speed-increasing gear pairs for increasing the output speed of the rotary driver 552 according to a preset ratio and then transmitting it to the dial 554.

[0060] In this way, the rotation of the dial 554 can be accelerated, thereby increasing the number of pulse flushing times within the same time and further improving the flushing effect.

[0061] In addition, in a specific implementation, a one-way valve may be integrated in the connecting channel 300, and the one-way valve only allows the flushing liquid to flow from the liquid storage unit 200 to the liquid outlet port to prevent the flushing liquid from flowing back into the liquid storage unit 200 and affecting the flushing effect.

[0062] How to use the above central venous catheter flushing device:

[0063] When in use, it is only necessary to connect the central venous catheter 1 to the liquid outlet port, then connect the injection unit 100 to the external syringe, inject flushing liquid into the liquid storage unit 200 and the liquid infusion unit 530, then start the external syringe and the rotary driver 552, set the rotation cycle of the rotary driver 552, and then the flushing liquid can be used to flush the central venous catheter 1 in a pulsed manner in each rotation cycle. During this process, no manual intervention is required, thereby achieving the purpose of improving the injection effect and absorption effect of the drug.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present invention, and they should all be covered within the scope of the claims and the description of the present invention.

Claims

1. A central venous catheter flushing device, characterized in that: include: The injection unit is arranged in the vertical direction and comprises an injection cavity for containing liquid medicine, and a connection interface adapted to an external syringe is provided at the top of the injection cavity; A liquid storage unit is arranged in a vertical direction and includes a liquid storage cavity for storing flushing liquid; A connecting channel, which is transversely arranged between the injection unit and the liquid storage unit, and has a liquid outlet port on one side close to the bottom thereof, which is in fluid communication with the liquid storage unit; A catheter assembly, sealed and connected to the liquid outlet port, for accessing a central venous catheter; A flow stop assembly, comprising an axially slidable flow stop plug, the flow stop plug being sealingly disposed in the connecting channel and being located between the liquid outlet port and the liquid storage unit in an initial state to block the communication between the two; The timing drive mechanism is linked with the flow stop assembly to drive the flow stop plug to move toward the injection unit after a preset time interval, so that the liquid storage unit is connected to the liquid outlet port to achieve periodic flushing of the central venous catheter with the flushing liquid.

2. The central venous catheter flushing device according to claim 1, characterized in that: The timing drive mechanism comprises: a first return spring, disposed in the connecting passage and connected to the stopper; A piston assembly is slidably disposed in the liquid storage unit, a side wall of the liquid storage unit is provided with a liquid replenishing port and a liquid replenishing valve, and the liquid replenishing port is located between the piston assembly and the stop plug; A fluid infusion unit, connected to the fluid infusion port of the fluid storage unit through a fluid infusion channel; A driving connecting rod, fixed to the top of the piston assembly; A linear actuator is connected to the driving connecting rod and is used to periodically drive the piston assembly to move downward to compress the flushing liquid in the liquid storage unit and push the stop plug to move by hydraulic pressure.

3. The central venous catheter flushing device according to claim 2, characterized in that: The timing drive mechanism further comprises a second return spring, wherein the second return spring is supported on the piston assembly, and when the second return spring is in a natural state, the piston assembly is located close to the top end of the liquid storage unit.

4. The central venous catheter flushing device according to claim 2, characterized in that: A limit block is provided in the connecting channel, and the limit block is fixed to the inner wall of the connecting channel and is used to limit the displacement of the stop plug toward the liquid storage unit.

5. The central venous catheter flushing device according to claim 2, characterized in that: The linear drive can drive the piston assembly to move up and down multiple times within each cycle of driving the piston assembly to move downward, so as to enhance the pulse effect of the flushing liquid flow.

6. The central venous catheter flushing device according to claim 5, characterized in that: The linear driver is a stepper motor or an electromagnetic linear actuator, and its control module is configured to trigger the driving action according to a preset cycle.

7. The central venous catheter flushing device according to claim 5, characterized in that: The linear drive comprises a mechanical transmission assembly, wherein the mechanical transmission assembly comprises: Main gear; A rotary driver, with a mounting plate provided at the output end; Teeth, a plurality of teeth are circumferentially spaced on the outer edge of the mounting plate, and the mounting plate and the main gear drive the main gear to rotate periodically; A toggle plate, coaxially fixed to the rotating shaft of the main gear, with toggle teeth distributed at intervals in the circumferential direction; and A lever assembly is rotatably arranged via an articulated support frame, one end of which is slidably articulated with the driving connecting rod, and the other end of which extends to the rotation path of the dial; The shifting teeth sequentially abut against and lift the lever assembly during the rotation process, driving the piston assembly to move downward.

8. The central venous catheter flushing device according to claim 7, characterized in that: The mechanical transmission assembly also includes an acceleration gear assembly, which includes at least two-stage speed-increasing gear pairs, and is used to increase the output speed of the rotary drive according to a preset ratio and then transmit it to the dial.

9. The central venous catheter flushing device according to claim 2, characterized in that: A one-way valve is integrated in the connecting channel, and the one-way valve only allows the flushing liquid to flow from the liquid storage unit to the liquid outlet port.

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