A central venous catheter patency testing device

Abstract

The utility model discloses a central venous catheter patency testing arrangement relates to medical instrument technical field, specifically, including: drive assembly is used for driving syringe to inject and aspirate, and the movable part of drive assembly is provided with force sensor between syringe's piston, is used for gathering the driving force required when syringe injection and aspiration, first fixture is opposite fixed arrangement with fixed part in drive assembly, is used for fixing the casing of syringe, control module is electric connection with control unit of drive assembly and force sensor, central venous catheter patency testing arrangement drives syringe action through drive assembly, drives the blood flow in catheter, and detects the force of drive syringe through force sensor, judges the patency of catheter according to the change of measured value, and then can judge the patency of catheter through the quantitative data, to ensure the accuracy of the judgment result.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and more specifically, to a central venous catheter patency testing device. Background Technology

[0002] Among patients requiring hemodialysis, some need central venous catheterization due to initial dialysis or arteriovenous fistula blockage, and undergo hemodialysis treatment through a central venous catheter.

[0003] Hemodialysis requires a continuous and stable blood flow, but patients' actual blood conditions vary, and some patients may experience insufficient catheter flow, making effective hemodialysis impossible. In such cases, medical staff will use their experience to adjust the catheter position or the angle at which the catheter enters the body, and use a syringe to draw blood from the catheter to assess the patency of the central venous catheter.

[0004] However, this kind of subjective judgment is not accurate and may lead to the following situations: a) setting the dialysis machine blood flow rate higher than the actual flow rate of the catheter, causing the dialysis machine arterial pressure to drop continuously to the point that dialysis cannot continue; b) setting the dialysis machine blood flow rate much lower than the actual blood flow rate of the catheter, causing the patient to be unable to undergo adequate dialysis; c) being unable to find the most suitable position with the maximum actual blood flow rate of the catheter by adjusting the catheter, thus wasting the potential for more adequate dialysis.

[0005] In summary, how to solve the problem of inaccurate judgment by humans on whether the actual flow rate of the catheter has reached the maximum flow rate is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a central venous catheter patency testing device, which drives the syringe to move through a driving component, thereby causing blood to flow in the catheter, and detects the force of the driving syringe through a force sensor. Based on the changes in the measured value, the patency of the catheter is determined, and thus the catheter patency can be determined through quantitative data to ensure the accuracy of the judgment result.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A central venous catheter patency testing device, comprising:

[0009] A drive assembly for driving a syringe to inject and aspirate, wherein a force sensor is provided between the movable part of the drive assembly and the piston of the syringe for collecting the driving force required by the syringe during injection and aspiration;

[0010] A first clamp is fixedly arranged relative to a fixed portion within the drive assembly for securing the syringe housing.

[0011] The control module is electrically connected to the control unit of the drive assembly and the force sensor, and is used to control the operation of the drive assembly and receive test data from the force sensor.

[0012] Preferably, the drive assembly includes a sliding frame and a drive module for driving the sliding frame to move;

[0013] The force sensor is disposed within the sliding frame. The force sensor includes a pressure sensor and a tension sensor, which are used to measure the driving force required for the syringe to inject and aspirate, respectively.

[0014] Preferably, the sliding frame is provided with a force application surface via the pressure sensor on the side near the syringe, and is connected to several sets of hooks via the tension sensor;

[0015] The force-applying surface and the hook respectively abut against the two ends of the first limiting module at the end of the piston rod inside the syringe, and the normal direction of the force-applying surface and the hook abutting the first limiting module is consistent with the direction of the piston movement doing work.

[0016] Preferably, the drive assembly further includes a slide rail, the length direction of which is consistent with the movement direction of the piston, and the sliding frame is slidably mounted to the slide rail.

[0017] Preferably, the drive module includes a motor and a lead screw assembly. The output end of the motor is poweredly connected to the lead screw nut in the lead screw assembly through a transmission pair. The lead screw in the lead screw assembly is fixedly connected to the sliding frame.

[0018] The length direction of the lead screw assembly is consistent with the length direction of the slide rail;

[0019] The motor's control unit is electrically connected to the control module.

[0020] Preferably, it also includes a base, and both the control module and the first clamp are fixedly connected to the base;

[0021] The base is provided with a mounting groove, the length direction of which is consistent with the movement direction of the piston;

[0022] The first clamp is fixedly disposed in the mounting slot, and the mounting slot is further provided with a plurality of mounting positions for fixing the drive component.

[0023] Preferably, a second clamp is provided at the end of the mounting groove for fixing the syringe housing, thereby limiting the displacement of the syringe housing along the direction of movement perpendicular to the piston;

[0024] The first clamp is provided with a locking groove for locking the second limiting module at the end of the syringe housing, thereby limiting the displacement of the syringe housing along the movement direction of the piston.

[0025] Preferably, a displacement sensor is provided within the substrate or drive assembly to measure the displacement of the moving part of the drive assembly.

[0026] The central venous catheter patency testing device provided by this utility model has at least the following advantages compared with the prior art:

[0027] The syringe is driven by a drive component, which in turn drives the blood flow in the catheter. By measuring the driving force of the syringe and the changes in the measured value, the patency of the catheter is determined. This allows for the assessment of catheter patency through quantitative indicators, thereby improving the accuracy of the assessment results. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0029] Figure 1 A schematic diagram of the central venous catheter patency testing device provided by this utility model;

[0030] Figure 2 A schematic diagram of another embodiment of the central venous catheter patency testing device provided by this utility model;

[0031] Figure 3 This is a schematic diagram of the assembly of the moving part of the drive component and the syringe provided by this utility model;

[0032] Figure 4 This is a schematic diagram of the driving component provided by this utility model driving the syringe to inject to the end;

[0033] Figure 5 This is a schematic diagram of the driving component provided by this utility model driving the syringe to draw aspiration to the end.

[0034] Figures 1-5 middle:

[0035] 1. Control module; 11. Control buttons; 12. Display screen;

[0036] 2. First fixture;

[0037] 3. Drive assembly; 31. Lead screw assembly; 32. Slide rail; 33. Motor; 34. Sliding frame; 35. Pressure sensor; 36. Tension sensor; 37. Hook;

[0038] 4. Syringe; 5. Connecting tubing; 6. Second clamp. Detailed Implementation

[0039] 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.

[0040] The core of this invention is to provide a central venous catheter patency testing device. It drives the syringe to move through a drive component, thereby causing blood to flow in the catheter. The force sensor detects the force applied to the syringe and determines the patency of the catheter based on the changes in the measured values. This allows for the determination of catheter patency through quantitative data, ensuring the accuracy of the determination results.

[0041] Please refer to Figures 1-5 A central venous catheter patency testing device, comprising:

[0042] The driving component 3 is used to drive the syringe 4 to inject and aspirate. A force sensor is set between the moving part of the driving component 3 and the piston of the syringe 4 to collect the driving force required by the syringe 4 during injection and aspiration.

[0043] The first clamp 2 is fixedly arranged relative to the fixed part in the drive assembly 3 and is used to fix the housing of the syringe 4;

[0044] Control module 1 is electrically connected to the control unit and force sensor of drive component 3, and is used to control the operation of drive component 3 and receive test data from force sensor.

[0045] In actual use, the syringe 4 is fixed to the first clamp 2 and the piston and the moving part of the drive assembly 3 are connected. The syringe 4 is connected to the central venous catheter through the connecting tube 5.

[0046] The drive component 3 drives the syringe 4 to draw blood at a set constant speed. The syringe 4 can draw blood out of the catheter at a specific speed. When the set constant speed is less than the maximum allowable blood flow speed of the catheter, the force sensor measurement value does not change with time. When the set constant speed is greater than the maximum allowable blood flow speed of the catheter, the force sensor measurement value increases with time. Therefore, the set constant speed is adjusted until the force sensor measurement value is at the critical value where it increases or does not change with time. That is, the set constant speed is the maximum allowable blood flow speed of the catheter.

[0047] However, in actual use, the maximum allowable blood flow velocity of the catheter may change due to factors such as the catheter placement method, insertion position, or insertion depth. Therefore, the optimal placement method of the catheter can be obtained by adjusting factors such as the placement method, insertion position, or insertion depth.

[0048] Specifically, the driving component 3 drives the syringe 4 at a set constant speed, and the arrangement of the catheter is adjusted during the process. When the maximum allowable blood flow velocity of the catheter increases, the test value of the force sensor decreases. When the maximum allowable blood flow velocity of the catheter decreases, the test value of the force sensor increases. Therefore, when the test value of the force sensor reaches the minimum value, it indicates that the catheter has reached the optimal arrangement. At this time, the maximum allowable blood flow velocity of the catheter can be measured to obtain the best dialysis effect.

[0049] It is worth noting that during the test, the force sensor has an upper limit. When the test value exceeds the upper limit, it indicates that the conduit is blocked and should be adjusted before testing.

[0050] like Figure 4 and Figure 5 In actual testing, the drive component 3 can not only drive the syringe 4 to aspirate, but also drive the syringe 4 to inject. Tests can be performed during the process, and the tests of both aspiration and injection strokes can detect the maximum permissible blood flow velocity in both directions of the catheter.

[0051] In some embodiments, the drive component 3 includes a slide 34 and a drive module that drives the slide 34 to move.

[0052] Force sensors are installed inside the sliding frame 34. The force sensors include a pressure sensor 35 and a tension sensor 36, which are used to measure the driving force required for the syringe 4 to inject and aspirate, respectively.

[0053] like Figure 3As shown, by setting pressure sensor 35 and tension sensor 36 in the sliding frame 34, the driving force of syringe 4 during injection and the driving force during aspiration are respectively satisfied, so that syringe 4 can perform maximum permissible blood flow velocity test of catheter during aspiration and injection stroke, and can test the maximum permissible blood flow velocity of catheter in both directions.

[0054] In some embodiments, the sliding frame 34 is provided with a force application surface via a pressure sensor 35 on the side near the syringe 4, and is connected to a plurality of hooks 37 via a tension sensor 36.

[0055] The force-applying surface and the hook 37 respectively abut against the two ends of the first limiting module at the end of the piston rod inside the syringe 4, and the normal direction of the force-applying surface and the hook 37 abutting against the first limiting module is consistent with the direction of the piston movement doing work.

[0056] The force application surface and the hook 37 respectively abut against the first limiting module at the end of the piston rod inside the syringe 4 from both ends, which is used to push the piston rod to move towards both ends along a set trajectory.

[0057] like Figure 3 As shown, there is a gap between the force-applying surface and the hook 37. This gap allows the first limiting module at the end of the piston rod of the syringe 4 to be snapped and fixed, enabling the sliding frame 34 to quickly connect with the piston rod and allowing the sliding frame 34 to drive the piston rod to move.

[0058] When the sliding frame 34 drives the syringe 4 to inject, the force application surface abuts against the end of the piston rod, and the pressure sensor 35 is used for data measurement.

[0059] When the sliding frame 34 drives the syringe 4 to draw, the hook 37 abuts against the first limit module, and the tension sensor 36 is used for data measurement.

[0060] In some embodiments, the drive assembly 3 further includes a slide rail 32, the length direction of which is consistent with the movement direction of the piston, and the sliding frame 34 is slidably mounted on the slide rail 32.

[0061] like Figure 2 As shown, by setting a slide rail 32 in the drive assembly 3, the sliding frame 34 is guided to move along a set trajectory to ensure the smooth movement of the sliding frame 34, avoid fluctuations in the force sensor test values ​​caused by the unstable movement of the sliding frame 34, and thus improve the effectiveness of the test results.

[0062] In some embodiments, the drive module includes a motor 33 and a lead screw assembly (31). The output end of the motor (33) is poweredly connected to the lead screw nut in the lead screw assembly (31) through a transmission pair. The lead screw in the lead screw assembly (31) is fixedly connected to the sliding frame (34).

[0063] The length direction of the lead screw assembly (31) is consistent with the length direction of the slide rail (32);

[0064] The control unit of motor 33 is electrically connected to control module 1.

[0065] like Figure 2 As shown, motor 33 is preferably a stepper motor or servo motor, which has high control precision and is easy to adjust speed. At the same time, the power transmission is carried out by the lead screw assembly 31, which enables the sliding frame 34 to move smoothly, thereby reducing the influence of the drive assembly 3 on the force sensor test results.

[0066] Specifically, motor 33 drives the lead screw nut to rotate, and the lead screw nut rotates relative to the lead screw, causing the lead screw to move axially, which in turn causes the sliding frame 34 to move axially.

[0067] In some embodiments, the system further includes a base, and the control module 1 and the first clamp 2 are both fixedly connected to the base;

[0068] The base is provided with an installation groove, the length direction of which is consistent with the movement direction of the piston.

[0069] The first clamp 2 is fixedly installed in the mounting slot, and the mounting slot is also provided with several sets of mounting positions for fixing the drive component 3.

[0070] like Figure 2 As shown, the drive component 3 and the base are designed to be detachable, and the mounting slot is provided with several mounting positions for the drive component 3, so that there are multiple relative positional relationships between the drive component 3 and the first clamp 2, which makes it suitable for different types of syringes 4, and thus makes this application applicable to more scenarios.

[0071] In some embodiments, a second clamp 6 is provided at the end of the mounting groove for fixing the syringe 4, thereby limiting the displacement of the syringe 4 in a direction perpendicular to the movement of the piston.

[0072] The first clamp 2 is provided with a locking groove for locking the second limiting module at the end of the syringe 4, which is used to limit the displacement of the syringe 4 along the movement direction of the piston.

[0073] like Figure 2 and Figure 3 As shown, the first clamp 2 and the second clamp 6 work synchronously to fix both ends of the syringe 4, ensuring the stability of the syringe 4 during the test and avoiding the reduction of the effectiveness of the test results due to the displacement of the syringe 4.

[0074] Meanwhile, the first clamp 2 uses a snap-fit ​​groove to limit the second limiting module of the syringe 4, which facilitates the disassembly and assembly of the syringe 4, helps to achieve aseptic operation of one syringe per person, and avoids cross-infection.

[0075] In some embodiments, a displacement sensor is provided in the base or drive assembly 3 for measuring the displacement of the moving part of the drive assembly 3.

[0076] By setting a displacement sensor in the base or drive assembly 3, the real-time position of the sliding frame 34 is detected, thus preventing the displacement of the sliding frame 34 from exceeding the maximum stroke of the piston in the syringe 4.

[0077] like Figure 1 As shown, the control module 1 is located inside the base, and the control module 1 includes control buttons 11 and a display screen 12. The control buttons 11 are used to switch the test mode and adjust the feed speed of the motor 33. The display screen 12 is used to display the current speed of the motor 33 and the test value of the force sensor, or directly display the change curve of the force sensor test value, which can intuitively show the change trend of the test value.

[0078] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0079] The central venous catheter patency testing device provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A central venous catheter patency testing device, characterized in that, include: A drive assembly (3) is used to drive the syringe (4) to inject and aspirate. A force sensor is provided between the movable part of the drive assembly (3) and the piston of the syringe (4) to collect the driving force required by the syringe (4) to inject and aspirate. The first clamp (2) is fixedly arranged relative to the fixed part in the drive assembly (3) for fixing the housing of the syringe (4); The control module (1) is electrically connected to the control unit of the drive component (3) and the force sensor, and is used to control the operation of the drive component (3) and receive the test data of the force sensor.

2. The central venous catheter patency testing device according to claim 1, characterized in that, The drive assembly (3) includes a sliding frame (34) and a drive module for driving the sliding frame (34) to move; The force sensor is disposed inside the sliding frame (34). The force sensor includes a pressure sensor (35) and a tension sensor (36), which are used to measure the driving force required for the syringe (4) to inject and aspirate, respectively.

3. The central venous catheter patency testing device according to claim 2, characterized in that, The sliding frame (34) is provided with a force application surface through the pressure sensor (35) on the side near the syringe (4), and is connected to several sets of hooks (37) through the tension sensor (36). The force-applying surface and the hook (37) respectively abut against the two ends of the first limiting module at the piston rod end inside the syringe (4), and the normal direction of the force-applying surface and the hook (37) abutting against the first limiting module is consistent with the direction of the piston movement doing work.

4. The central venous catheter patency testing device according to claim 2, characterized in that, The drive assembly (3) further includes a slide rail (32), the length direction of which is consistent with the movement direction of the piston, and the sliding frame (34) is slidably mounted to the slide rail (32).

5. The central venous catheter patency testing device according to claim 2, characterized in that, The drive module includes a motor (33) and a lead screw assembly (31). The output end of the motor (33) is poweredly connected to the lead screw nut in the lead screw assembly (31) through a transmission pair. The lead screw in the lead screw assembly (31) is fixedly connected to the sliding frame (34). The length direction of the lead screw assembly (31) is consistent with the length direction of the slide rail (32); The control unit of the motor (33) is electrically connected to the control module (1).

6. The central venous catheter patency testing device according to any one of claims 1-5, characterized in that, It also includes a base, and the control module (1) and the first clamp (2) are both fixedly connected to the base; The base is provided with an installation groove, the length direction of which is consistent with the movement direction of the piston; The first clamp (2) is fixedly installed in the mounting slot, and the mounting slot is also provided with a number of mounting positions for fixing the drive assembly (3).

7. The central venous catheter patency testing device according to claim 6, characterized in that, The end of the mounting groove is provided with a second clamp (6) for fixing the syringe (4) housing, which restricts the displacement of the syringe (4) housing along the direction of movement perpendicular to the piston; The first clamp (2) is provided with a locking groove for locking the second limiting module at the end of the syringe (4) housing, which is used to limit the displacement of the syringe (4) housing along the movement direction of the piston.

8. The central venous catheter patency testing device according to claim 6, characterized in that, A displacement sensor is provided inside the base or drive assembly (3) for measuring the displacement of the moving part of the drive assembly (3).

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