Liquid delivery device

Abstract

The liquid conveying device comprises a liquid storage device, a filter and a liquid conveying pipeline, a liquid inlet and a liquid outlet are formed in the liquid storage device, the filter comprises an inlet and a plurality of outlets, the inlet is communicated with the liquid outlet, the outlets are all communicated with the inlet, the filter comprises a first circulation section and a second circulation section, and the first circulation section and the second circulation section are arranged at an angle. A circulation cavity is formed in the first circulation section, a plurality of circulation channels which are arranged at intervals are formed in the second circulation section, the circulation channels are all communicated with the circulation cavity, and the ends, away from each other, of the circulation cavity and the circulation channels are an inlet and an outlet of the filter respectively; the number of the liquid conveying pipelines is the same as that of the outlets, each liquid conveying pipeline comprises a flow limiting pipe and a liquid conveying pipe which are communicated with each other, the end, away from the liquid conveying pipe, of the flow limiting pipe is communicated with the corresponding outlet, and the end, away from the flow limiting pipe, of the liquid conveying pipe is used for being communicated with an implantable catheter. When the implantable catheter is provided with a plurality of connectors, the connectors can be dredged at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a liquid conveying device. Background Art

[0002] Implantable medical device catheters are medical devices that are implanted in the human body for a long time or permanently. They are widely used in various medical fields, such as cardiology, kidney disease treatment, and neurological disease management. The implantable catheters are implanted in the human body for a long time. After use, the patients return to their homes and lose clinical care. Since the implantable catheters are in a closed state, blood easily coagulates at the catheter opening to form thrombi in the absence of drug flow. When the patient goes to the clinic again, the thrombi have blocked the implantable catheters.

[0003] In addition, with the continuous development of medical technology, such implantable catheters have begun to appear in double-headed or multi-headed structures. For example, a peripherally inserted central catheter (PICC catheter) or a central venous catheter (CVC catheter) has a double-lumen structure, and each implantable catheter has two female Luer connectors.

[0004] In the above situation, medical staff need to clinically clear the implanted catheter, and each female Luer connector of the implanted catheter needs to be cleared, which greatly increases the operation time of medical staff. In addition, the method of clearing the implanted catheter blocked by thrombus is not good for the patient's health. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a liquid delivery device to overcome the defects in the prior art that medical staff need to spend a long time to dredge the implanted catheter and the operation is not conducive to the health of the patient.

[0006] The utility model solves the above technical problems through the following technical solutions:

[0007] A liquid delivery device, characterized in that the liquid delivery device comprises:

[0008] A liquid reservoir, wherein the liquid reservoir is provided with a liquid inlet and a liquid outlet;

[0009] A filter, wherein the filter comprises an inlet and a plurality of outlets, the inlet is connected to the liquid outlet, and the plurality of outlets are all connected to the inlet; the filter comprises a first flow section and a second flow section arranged at an angle to each other, the first flow section is provided with a flow cavity inside, the second flow section is provided with a plurality of flow channels spaced from each other inside, the plurality of flow channels are all connected to the flow cavity, and the ends of the flow cavity and the flow channels that are far away from each other are the inlet and the outlet of the filter respectively;

[0010] Infusion pipelines, the number of which is the same as the number of the outlets, each of which includes a flow limiting tube and an infusion tube that are interconnected, the end of the flow limiting tube away from the infusion tube is connected to the corresponding outlet, and the end of the infusion tube away from the flow limiting tube is used to connect to an implantable catheter.

[0011] In the present scheme, through this arrangement, the liquid delivery device can utilize a liquid reservoir to store liquid, and the stored liquid can be discharged from the outlet of the filter after passing through the filter, and the pressure of the liquid can be adjusted by decelerating the flow limiting tube. On the one hand, the liquid can be facilitated to smoothly pass through the infusion tube into the interior of the implantable catheter, so that the interior of the implantable catheter has real-time flowing liquid, thereby preventing the implantable catheter from being blocked by thrombus when it is in a closed state. On the other hand, the pressure of the liquid entering the interior of the implantable catheter can be adjusted according to actual conditions to avoid excessive pressure causing impact on the patient's blood vessels and affecting the patient's health; at the same time, the filter is configured to include multiple outlets, and the infusion pipeline and the outlet are configured to have the same number. When the implantable catheter implanted in the human body has multiple interfaces, the liquid delivery device can also be used to clear the multiple interfaces at the same time, thereby avoiding the setting of multiple liquid delivery devices to clear the multiple interfaces separately. While improving the clearing efficiency, the overall structure can also be simplified to avoid the overall structure being too complicated or the number of liquid delivery devices being too large, which is inconvenient for patients to carry.

[0012] Since the liquid directly enters the liquid inlet of the filter from the liquid reservoir, the liquid has a relatively large pressure at this time, which is not conducive to the liquid simultaneously passing through the multiple outlets of the filter and entering multiple flow-limiting tubes for flow limiting and pressure reduction. By setting the filter to have a first flow section and a second flow section that are set at an angle to each other, and by setting the specific structures of the first flow section and the second flow section, after the liquid enters the interior of the filter, it can first be buffered in the flow cavity inside the first flow section, and the turbulent effect of the liquid is used to initially reduce the liquid pressure, so that the flow of the liquid is more stable, thereby more effectively promoting the liquid to flow out through multiple flow channels inside the second flow section at the same time, and enter different flow-limiting tubes respectively, for further flow limiting and pressure reduction, so as to ensure that the pressure of the liquid that finally enters the implantable catheter through the infusion tube meets the actual needs, and at the same time, it can also avoid the situation where there is no real-time flowing liquid in the individual interfaces of the implantable catheter and cause thrombosis.

[0013] Furthermore, the plurality of circulation channels are arranged in parallel inside the second circulation section and extend along the length direction of the second circulation section, and the inner diameters of the plurality of circulation channels are the same.

[0014] In the present solution, through this arrangement, the internal structure of the filter is made more neat and reasonable. After the liquid is buffered in the flow cavity, it can more effectively enter multiple flow channels arranged in parallel at the same time, and the extension direction and inner diameter size of the multiple flow channels are the same, so that when the liquid enters different flow limiting tubes through these flow channels respectively, a large gap can be better avoided, and ultimately the multiple interfaces of the implantable catheter can have real-time and synchronous flowing liquid.

[0015] Furthermore, the second flow section is provided with an abutment portion in each of the flow channels, and the abutment portion extends from the inner wall of the second flow section to the inside of the corresponding flow channel;

[0016] The flow limiting tube of the infusion pipeline is inserted into the second circulation section through the circulation channel and abuts against the abutment portion corresponding to the inside of the circulation channel.

[0017] In the present solution, through this arrangement, the flow limiting tube of the infusion pipeline is specifically inserted into the second flow section of the filter through the flow channel, thereby ensuring the convenience of the connection between the flow limiting tube and the filter, and at the same time more effectively realizing the connection between the flow limiting tube and the corresponding outlet of the filter, ensuring that the liquid smoothly passes through the filter into the interior of the flow limiting tube; at the same time, the flow limiting tube abuts against the corresponding abutment portion inside the flow channel to limit the end of the flow limiting tube, avoiding the flow limiting tube from being directly inserted into the flow cavity through the flow channel or abutting against the wall of the filter, thereby improving the stability of the setting position of the flow limiting tube relative to the filter and the reliability of the liquid entering the flow limiting tube.

[0018] Furthermore, the flow limiting tubes of the plurality of infusion pipelines are inserted into the second circulation section through the plurality of circulation channels, and the inner diameters and lengths of the plurality of flow limiting tubes are the same.

[0019] In the present solution, through this arrangement, the flow limiting tubes of multiple infusion pipelines are specifically inserted into the second flow section of the filter through the flow channel, thereby ensuring the convenience of connection between the flow limiting tube and the filter, and at the same time more effectively realizing the connection between the flow limiting tube and the corresponding outlet of the filter, ensuring that the liquid passes through the filter smoothly into the interior of the flow limiting tube; at the same time, the inner diameter size and length size of the multiple flow limiting tubes are the same, so as to ensure that when the liquid passes through the multiple flow channels of the filter and enters different flow limiting tubes respectively, it can avoid a large difference in the flow of liquid in different flow limiting tubes, thereby further enabling the multiple interfaces of the implantable catheter to have real-time and synchronous flowing liquid.

[0020] Furthermore, the liquid reservoir comprises a connecting joint, and the connecting joint is provided with the liquid inlet and the liquid outlet;

[0021] The first flow section includes a mating section and a fixed section connected in sequence, the liquid outlet is sealed and connected to the inside of the mating section, the flow cavity is arranged inside the fixed section, and the fixed section is respectively connected to the second flow section and the liquid outlet through the flow cavity.

[0022] In the present solution, by setting the first flow section as a mating section and a fixed section connected in sequence, and utilizing the mating section to perform a sealing connection with the liquid outlet of the liquid reservoir, the stability of the connection between the filter and the liquid reservoir is ensured, and leakage of the liquid at the sealed connection is avoided. At the same time, the liquid can also be effectively promoted to pass through the liquid reservoir into the flow cavity of the first flow section for buffering.

[0023] Furthermore, the radial dimension of the mating segment is greater than the radial dimension of the fixing segment, the mating segment and the fixing segment are coaxially connected in sequence and a step portion is formed at the connection position;

[0024] The filter further includes a filter membrane, and the filter membrane is sandwiched between the liquid outlet and the step portion.

[0025] In the present solution, by arranging the structure and position of the mating section and the fixed end, a step portion is formed at the connection position between the two, and the filter membrane is arranged at the position of the step portion, so that when the liquid outlet is sealed and connected in the mating section, the filter membrane can be squeezed between the liquid outlet and the step portion at the same time, so that the filter membrane can stably filter the liquid entering the circulation cavity, further improving the reliability of the use of the liquid delivery device and ensuring the health of the patient.

[0026] Furthermore, the connecting joint is further provided with a clamping portion at the position of the liquid outlet, and the clamping portion is spaced apart from and cooperates with the outer wall of the connecting joint at the corresponding position to form an annular fixing cavity;

[0027] When the liquid outlet is sealed and connected in the matching section, the corresponding end of the matching section is clamped in the interior of the annular fixing cavity.

[0028] In the present solution, through this arrangement, when the liquid outlet of the liquid reservoir is sealed and connected to the mating section of the first flow section, the corresponding end of the mating section can be clamped and fixed inside the annular fixed cavity to further improve the stability of the connection between the liquid reservoir and the filter, and avoid shaking of the liquid reservoir and the filter in the non-connection direction, thereby affecting the reliability of the liquid delivery device during use.

[0029] Furthermore, the liquid delivery device also includes a fixed protective cap, which is provided with a plurality of communication ports, and the flow limiting tube and the infusion tube of each infusion pipeline are detachably connected through the communication ports of the fixed protective cap.

[0030] In the present scheme, through this arrangement, the flow limiting tubes and infusion tubes of multiple infusion pipes are fixed by using fixed protective caps. On the one hand, the relative positions of the multiple infusion pipes at the fixed protective caps are kept fixed, avoiding large relative movement of these infusion pipes during the liquid delivery process, which affects the normal delivery of the liquid; on the other hand, the fixed protective caps can be used to make the flow limiting tubes and infusion tubes of the infusion pipes detachable and connected, which is more convenient in assembly and also more convenient when the infusion pipes need to be replaced.

[0031] Furthermore, the liquid delivery device further comprises a housing, the liquid reservoir, the filter and the flow limiting tube of the liquid infusion pipeline are all fixedly arranged inside the housing, and the liquid infusion tube of the liquid infusion pipeline is arranged outside the housing;

[0032] The shell is provided with a first through hole and a second through hole at the bottom in the vertical direction, the fixed protective cap is penetrated and fixed at the position of the first through hole, and the liquid outlet of the liquid reservoir is fixed at the position of the second through hole.

[0033] In the present solution, through this arrangement, the liquid reservoir, filter and flow limiting tube are all fixed inside the shell, making the overall structure of the liquid delivery device more compact, thereby making it more convenient for the patient to carry it with him; at the same time, a first through hole and a second through hole are opened at the bottom of the shell to facilitate the setting of a fixed protective cap and the liquid outlet of the liquid reservoir, thereby making it easier to connect the infusion tube and add liquid.

[0034] The positive and progressive effects of the utility model are:

[0035] The liquid delivery device can use a liquid reservoir to store liquid. The stored liquid can be discharged from the outlet of the filter after passing through the filter. The pressure of the liquid can be adjusted by decelerating the flow through the flow limiting tube. On the one hand, the liquid can be smoothly passed through the infusion tube into the implantable catheter, so that the implantable catheter has real-time flowing liquid inside, avoiding the implantable catheter from being blocked by thrombus in a closed state. On the other hand, the pressure of the liquid entering the implantable catheter can be adjusted according to actual conditions to avoid excessive pressure causing impact on the patient's blood vessels and affecting the patient's health.

[0036] At the same time, the filter is provided with multiple outlets, and the infusion pipeline and the outlets are provided with the same number. When the implantable catheter implanted in the human body has multiple interfaces, the liquid delivery device can also be used to clear the multiple interfaces at the same time, thereby avoiding the need to set up multiple liquid delivery devices to clear the multiple interfaces separately. While improving the clearing efficiency, the overall structure can also be simplified, avoiding the overall structure being too complicated or the number of liquid delivery devices being too large, which is inconvenient for patients to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the overall external structure of a liquid delivery device in one embodiment of the utility model;

[0038] Figure 2 This is a schematic cross-sectional view of the overall structure of a liquid delivery device in one embodiment of the utility model, wherein the infusion tube is hidden;

[0039] Figure 3 This is a schematic diagram of the overall structure of the liquid delivery device in one embodiment of the utility model; wherein the housing and the infusion tube are hidden;

[0040] Figure 4 This is a schematic diagram of the assembly structure of a liquid reservoir and a filter in a liquid delivery device in one embodiment of the utility model;

[0041] Figure 5 It is a cross-sectional schematic diagram of the assembly structure of the liquid reservoir and the filter in the liquid delivery device in one embodiment of the utility model;

[0042] Figure 6 It is a top view schematic diagram of the assembly structure of the connection joint and the filter in one embodiment of the utility model;

[0043] Figure 7 It is a schematic diagram of the structure of a filter in one embodiment of the utility model.

[0044] Description of reference numerals:

[0045] Liquid delivery device 1

[0046] Reservoir 10

[0047] Connector 20

[0048] Liquid inlet 21

[0049] Liquid outlet 22

[0050] Clamping portion 23

[0051] Filter 30

[0052] First flow section 31

[0053] Matching section 311

[0054] Flow chamber 3111

[0055] Step 3112

[0056] Fixed segment 312

[0057] Second flow section 32

[0058] Circulation channel 321

[0059] Contact portion 322

[0060] Restriction tube 40

[0061] Infusion tube 50

[0062] Male Luer 51

[0063] Fixed cap 60

[0064] Communication port 61

[0065] Upper housing 70

[0066] Lower housing 80

[0067] Sealing cover 90 DETAILED DESCRIPTION

[0068] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0069] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0070] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0071] This embodiment provides a liquid delivery device 1, such as Figure 1 and Figure 2 As shown, the liquid delivery device 1 mainly includes a shell, a liquid reservoir, a filter 30 and an infusion pipeline. The overall structure of the shell is composed of an upper shell 70 and a lower shell 80. The liquid reservoir includes a liquid storage bag 10 and a connecting joint 20 that are interconnected. The liquid reservoir is provided with a liquid inlet 21 and a liquid outlet 22 on the connecting joint 20. The liquid can be filled into the interior of the liquid storage bag 10 through the liquid inlet 21 of the connecting joint 20, and can also be discharged through the liquid outlet 22 of the connecting joint 20. The liquid discharged from the liquid outlet 22 of the connecting joint 20 can be passed through the filter 30 into the infusion pipeline.

[0072] The specific structure of the liquid storage capsule 10 can adopt the related structures existing in the art. For example, the peripheral wall material of the liquid storage capsule 10 can be a ductile material. When the liquid is filled into the liquid storage capsule 10, the peripheral wall of the liquid storage capsule 10 can expand outward along its radial direction, thereby effectively storing the liquid. After the liquid is filled into the liquid storage capsule 10, a sealing cap 90 can be connected at the position of the liquid inlet 21 of the connecting joint 20 to prevent the liquid from being lost from the liquid inlet 21.

[0073] like Figure 3 and Figure 4As shown, the filter 30 of the liquid delivery device 1 includes an inlet and two outlets, both of which are connected to the inlet, and the filter 30 is connected to the liquid outlet 22 on the connecting joint 20 through the inlet. At the same time, the number of infusion pipelines in the liquid delivery device 1 is the same as the number of outlets of the filter 30, that is, two infusion pipelines are provided in the liquid delivery device 1, and each infusion pipeline includes a flow limiting tube 40 and an infusion tube 50 that are connected to each other. Among them, the end of the flow limiting tube 40 away from the infusion tube 50 is connected to the outlet of the filter 30, and the end of the infusion tube 50 away from the flow limiting tube 40 is provided with a male Luer connector 51, and the infusion tube 50 is connected to the female Luer connector of the implantable catheter by its male Luer connector 51. Of course, if the implantable catheter is not provided with a female Luer connector, the end of the infusion tube 50 away from the flow limiting tube 40 may not be connected to the male Luer connector 51, as long as the infusion tube 50 can be stably connected to the implantable catheter.

[0074] Through this arrangement, the liquid delivery device 1 can use a liquid reservoir to store liquid. The stored liquid can be discharged from the two outlets of the filter 30 after passing through the filter 30. The pressure of the liquid is adjusted by slowing down the flow limiting tube 40. On the one hand, the liquid can be smoothly passed through the infusion tube 50 into the interior of the implantable catheter, so that the interior of the implantable catheter has real-time flowing liquid, avoiding the implantable catheter from being blocked by thrombus in a closed state. On the other hand, the pressure of the liquid entering the implantable catheter can be adjusted according to actual conditions to avoid excessive pressure causing impact on the patient's blood vessels and affecting the patient's health. At the same time, the filter 30 is set to include two outlets, and the infusion pipeline and the outlet are set to the same number. When the implantable catheter implanted in the human body has two interfaces, the liquid delivery device 1 can also be used to clear the two interfaces at the same time, thereby avoiding setting up two liquid delivery devices 1 to clear the two interfaces respectively. While improving the clearing efficiency, the overall structure can also be simplified to avoid the overall structure being too complicated or the number of liquid delivery devices 1 being too large, which is inconvenient for patients to carry.

[0075] In this embodiment, the number of the outlet of the filter 30 and the number of the infusion pipeline are both set to two, so as to adapt to an implantable catheter with two interfaces. However, in other alternative embodiments, if the implantable catheter implanted in the human body has three or more interfaces, the number of the outlet of the filter 30 and the number of the infusion pipeline in the liquid delivery device 1 can be set to three or more.

[0076] In addition, in this embodiment, by setting the interior of the implantable catheter with real-time flowing liquid, the flowing liquid is used to prevent the implantable catheter from being in a closed state and being blocked by thrombus. It is understandable that this setting needs to ensure that the composition and flow rate of the liquid will not cause harm to the patient. For example, the liquid can be physiological saline that is harmless to the human body. The flow rate of the liquid can be reduced to the minimum as much as possible, as long as it can be guaranteed to flow into the implantable catheter in real time, and there is no need to set an excessively fast speed. At the same time, the flow rate of the liquid and the pressure of the liquid can be adjusted by the flow limiting tube 40. For example, according to the human body conditions of different patients, the fluctuation range of the patient's blood pressure is obtained, and by adjusting the diameter, length and other dimensions of the flow limiting tube 40, the liquid pressure can be maintained slightly greater than the maximum value of the human blood pressure fluctuation range, thereby ensuring that the liquid can flow into the patient's body normally through the implantable catheter.

[0077] like Figure 3 and Figure 4 As shown, by connecting the filter 30 at the position of the liquid outlet 22 of the liquid reservoir, making it closer to the initial outflow outlet of the liquid, that is, closer to the source of the liquid outflow, setting two outlets of the filter 30 and connecting the flow limiting tubes 40 of the two infusion pipes respectively, compared with setting the filter 30 at other positions, it can effectively promote the flow of liquid inside the two infusion pipes. For example, if a flow limiting tube 40 is used to connect the liquid outlet 22 of the liquid reservoir, and the filter 30 is set at the end position of the flow limiting tube 40 away from the liquid reservoir, and two infusion pipes 50 are used to connect the filter 30 respectively, it may cause no liquid to flow in one of the infusion pipes 50. The reason is that the aperture of the flow limiting tube 40 is generally relatively small, and the flow rate of the liquid will become relatively smaller after it is decelerated and depressurized through the flow limiting tube 40. At this time, if the two infusion tubes 50 are of different lengths due to design, processing, manufacturing, etc., the liquid will preferentially flow into the relatively shorter infusion tube 50, which will cause no liquid to flow inside the relatively longer infusion tube 50, and the corresponding interface of the implantable catheter cannot be flushed.

[0078] In addition, it should be noted that the liquid delivery device 1 in this embodiment can not only use liquids such as physiological saline to flush and clear the implanted catheter, but also directly deliver the patient's medical fluid, so that the patient's medical fluid is directly delivered to the implanted catheter using the liquid delivery device 1, and further delivered to the patient's body to provide corresponding treatment to the patient.

[0079] like Figure 4 , Figure 5 and Figure 7As shown, the filter 30 of the liquid delivery device 1 includes a first flow section 31 and a second flow section 32 which are perpendicular to each other, the first flow section 31 further includes a matching section 311 and a fixed section 312, a flow cavity 3111 is arranged inside the first flow section 31, and two flow channels 321 which are spaced apart from each other are arranged inside the second flow section 32, both flow channels 321 are connected to the flow cavity 3111, and the ends of the flow cavity 3111 and the flow channels 321 which are far from each other serve as the inlet and outlet of the filter 30 respectively. Since the liquid directly enters the liquid inlet 21 of the filter 30 from the liquid reservoir, the liquid has a relatively large pressure at this time, which is not conducive to the liquid simultaneously passing through the two outlets of the filter 30 to enter the two flow limiting tubes 40 for flow limiting and pressure reduction. Through the above arrangement, after the liquid enters the filter 30, it is first buffered in the flow cavity 3111 inside the first flow section 31, and the liquid pressure is initially reduced by the turbulent effect of the liquid, so that the flow of the liquid is more stable, thereby more effectively promoting the liquid to flow out through the two flow channels 321 inside the second flow section 32 at the same time, and enter different flow limiting tubes 40 respectively, and further flow limiting and pressure reduction, so as to ensure that the pressure of the liquid finally entering the implantable catheter through the infusion tube 50 meets the actual needs, and at the same time, it can also avoid the situation where there is no real-time flowing liquid in the individual interfaces of the implantable catheter and cause thrombosis. Similarly, when the number of connectors of the implantable catheter is other, the same number of flow channels 321 can also be set inside the second flow section 32.

[0080] It should be noted that in this embodiment, the first flow section 31 and the second flow section 32 are arranged perpendicular to each other, so that the liquid can be effectively buffered in the flow cavity 3111 and then enter the flow channel 321 in the second flow section 32. In other alternative embodiments, the first flow section 31 and the second flow section 32 can be arranged at other angles according to actual needs without fixed restrictions.

[0081] like Figure 4 and Figure 7As shown, two circulation channels 321 are arranged in parallel inside the second circulation section 32, and both extend along the length direction of the second circulation section 32, and the inner diameters of the two circulation channels 321 are the same. Through this arrangement, the internal structure of the filter 30 is more neat and reasonable, and the liquid can more effectively enter the two parallel circulation channels 321 at the same time after buffering in the circulation cavity 3111, and the extension direction and inner diameter of the two circulation channels 321 are the same, so that when the liquid enters different flow limiting tubes 40 respectively through these circulation channels 321, a large gap can be avoided, and finally the two interfaces of the implantable catheter can have real-time and synchronous flowing liquid. Of course, since the filter 30 is directly connected to the liquid reservoir, the liquid flowing out of the liquid reservoir is not decelerated and depressurized by the flow limiting tube 40, so even if the inner diameters of the two circulation channels 321 are slightly different, it will not cause the liquid to flow inside one of the circulation channels 321.

[0082] Combination Figure 6 As shown, the second flow section 32 is provided with abutment portions 322 in both flow channels 321, and the abutment portions 322 extend from the inner wall of the second flow section 32 to the inside of the corresponding flow channel 321. When the flow limiting tube 40 of the infusion pipeline is inserted into the inside of the second flow section 32 through the flow channel 321, the flow limiting tube 40 abuts against the abutment portions 322 inside the corresponding flow channel 321. Through this arrangement, the flow limiting tube 40 of the infusion pipeline is specifically inserted into the second flow section 32 of the filter 30 through the flow channel 321, thereby ensuring the convenience of connection between the flow limiting tube 40 and the filter 30, and at the same time more effectively realizing the connection between the flow limiting tube 40 and the corresponding outlets of the filter 30, ensuring that the liquid smoothly passes through the filter 30 into the interior of the flow limiting tube 40; at the same time, the flow limiting tube 40 abuts against the corresponding abutment portion 322 inside the flow channel 321 to limit the end of the flow limiting tube 40, avoiding the flow limiting tube 40 from being directly inserted into the flow cavity 3111 through the flow channel 321 or abutting against the wall of the filter 30, thereby improving the stability of the setting position of the flow limiting tube 40 relative to the filter 30 and the reliability of the liquid entering the flow limiting tube 40.

[0083] In addition, when the flow limiting tubes 40 of the two infusion pipelines are respectively inserted into the corresponding second flow sections 32 through the two flow channels 321, the corresponding inner diameters and lengths of the flow limiting tubes 40 of the two infusion pipelines are the same. This arrangement ensures that when the liquid enters the two flow limiting tubes 40 through the two flow channels 321 of the filter 30, a large difference in the flow of the liquid inside the different flow limiting tubes 40 can be avoided, thereby further promoting the two interfaces of the implantable catheter to have real-time and synchronous flowing liquid.

[0084] like Figures 2 to 7As shown, the liquid reservoir also includes a connecting joint 20, and the liquid inlet 21 and the liquid outlet 22 of the liquid reservoir are both arranged on the connecting joint 20. In addition, the connecting joint 20 is also connected with the liquid storage capsule 10. The first flow section 31 of the filter 30 includes a matching section 311 and a fixed section 312 connected in sequence, the liquid outlet 22 on the connecting joint 20 is sealed and connected inside the matching section 311, and the flow cavity 3111 is arranged inside the fixed section 312. The fixed section 312 is respectively connected to the second flow section 32 and the liquid outlet 22 on the connecting joint 20 through the flow cavity 3111. By setting the first flow section 31 as the matching section 311 and the fixed section 312 connected in sequence, and using the matching section 311 to be sealed and connected with the liquid outlet 22 of the liquid reservoir, the sealing and stability of the connection between the filter 30 and the liquid reservoir are ensured, and liquid leakage at the sealed connection is avoided. At the same time, the liquid can also be effectively promoted to pass through the liquid reservoir into the flow cavity 3111 of the first flow section 31 for buffering.

[0085] like Figure 4 and Figure 7 As shown, the radial dimension of the matching section 311 in the first circulation section 31 is greater than the radial dimension of the fixed section 312, the matching section 311 and the fixed section 312 are coaxially connected in sequence and a step portion 3112 is formed at the connection position, and the filter membrane of the filter 30 is set between the liquid outlet 22 and the step portion 3112 on the connecting joint 20. Through the structure and position setting of the matching section 311 and the fixed end, the two form a step portion 3112 at the connection position, and the filter membrane is set at the position of the step portion 3112, so that when the liquid outlet 22 is sealed and connected in the matching section 311, the filter membrane can be clamped between the liquid outlet 22 and the step portion 3112 at the same time, so that the filter membrane can stably filter the liquid entering the circulation cavity 3111, further improving the reliability of the use of the liquid delivery device 1 and ensuring the health of the patient.

[0086] In addition, the connection joint 20 is also provided with a clamping part 23 at the position of the liquid outlet 22. The clamping part 23 is an annular structure. The clamping part 23 is spaced apart from the outer wall of the connection joint 20 at the corresponding position and cooperates to form an annular fixed cavity. When the liquid outlet 22 of the connection joint 20 is sealed and connected to the matching section 311 of the first flow section 31, the corresponding end of the matching section 311 is clamped inside the annular accommodating cavity. Through this arrangement, the stability of the connection between the liquid reservoir and the filter 30 is further improved, and the liquid reservoir and the filter 30 are prevented from shaking in the non-connection direction, thereby affecting the reliability of the liquid delivery device 1 in use.

[0087] like Figure 1 and Figure 3As shown, the liquid delivery device 1 also includes a fixed protective cap 60, and two connecting ports 61 are provided on the fixed protective cap 60. The flow limiting tube 40 and the infusion tube 50 of the two infusion pipelines are detachably connected through the connecting ports 61 of the fixed protective cap 60. Through this arrangement, the flow limiting tube 40 and the infusion tube 50 of the two infusion pipelines are fixed by using the fixed protective cap 60. On the one hand, the relative positions of the two infusion pipelines at the fixed protective cap 60 are kept fixed, so as to avoid large relative movement of these infusion pipelines during the liquid delivery process, which affects the normal delivery of the liquid; on the other hand, the flow limiting tube 40 and the infusion tube 50 of the infusion pipeline can be detachably connected by using the fixed protective cap 60, which is more convenient in assembly and more convenient when the infusion tube 50 needs to be replaced.

[0088] As described above, the housing of the liquid delivery device 1 includes an upper housing 70 and a lower housing 80, which are combined to form a complete housing, which is more convenient in installation and disassembly. At the same time, the liquid reservoir, the filter 30 and the flow limiting tube 40 of the infusion pipeline of the liquid delivery device 1 are all fixedly arranged inside the housing, and the infusion tube 50 of the infusion pipeline is arranged outside the housing. The bottom of the housing in the vertical direction is provided with a first through hole and a second through hole, and the fixed protective cap 60 is fixed at the first through hole position, and the liquid outlet 22 of the liquid reservoir is fixed at the second through hole position. Through this arrangement, the liquid reservoir, the filter 30 and the flow limiting tube 40 are all fixed inside the housing, so that the overall structure of the liquid delivery device 1 is more compact, so as to be more convenient for the patient to carry; at the same time, the first through hole and the second through hole are opened at the bottom of the housing, so as to facilitate the setting of the fixed protective cap 60 and the liquid outlet 22 of the liquid reservoir, so that the sealing cover 90 can be connected and sealed to the liquid outlet 22 outside the housing, and at the same time, the connection of the infusion tube 50 and the addition of liquid can be made more convenient.

[0089] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A liquid delivery device, characterized in that: The liquid delivery device comprises: A liquid reservoir, wherein the liquid reservoir is provided with a liquid inlet and a liquid outlet; A filter, wherein the filter comprises an inlet and a plurality of outlets, the inlet is connected to the liquid outlet, and the plurality of outlets are all connected to the inlet; the filter comprises a first flow section and a second flow section arranged at an angle to each other, the first flow section is provided with a flow cavity inside, the second flow section is provided with a plurality of flow channels spaced from each other inside, the plurality of flow channels are all connected to the flow cavity, and the ends of the flow cavity and the flow channels that are far away from each other are the inlet and the outlet of the filter respectively; Infusion pipelines, the number of which is the same as the number of the outlets, each of which includes a flow limiting tube and an infusion tube that are interconnected, the end of the flow limiting tube away from the infusion tube is connected to the corresponding outlet, and the end of the infusion tube away from the flow limiting tube is used to connect to an implantable catheter.

2. The liquid delivery device according to claim 1, characterized in that: The plurality of circulation channels are arranged in parallel inside the second circulation section and extend along the length direction of the second circulation section. The inner diameters of the plurality of circulation channels are the same.

3. The liquid delivery device according to claim 2, characterized in that: The second flow section is provided with an abutment portion in each of the flow channels, and the abutment portion extends from the inner wall of the second flow section to the inside of the corresponding flow channel; The flow limiting tube of the infusion pipeline is inserted into the second circulation section through the circulation channel and abuts against the abutting portion corresponding to the inside of the circulation channel.

4. The liquid delivery device according to claim 2, characterized in that: The flow limiting tubes of the plurality of liquid infusion pipelines are inserted into the second circulation section through the plurality of circulation channels, and the inner diameter and length of the plurality of flow limiting tubes are the same.

5. The liquid delivery device according to claim 1, characterized in that: The liquid reservoir comprises a connecting joint, on which the liquid inlet and the liquid outlet are arranged; The first flow section includes a mating section and a fixed section connected in sequence, the liquid outlet is sealed and connected to the inside of the mating section, the flow cavity is arranged inside the fixed section, and the fixed section is respectively connected to the second flow section and the liquid outlet through the flow cavity.

6. The liquid delivery device according to claim 5, characterized in that: The radial dimension of the mating section is greater than the radial dimension of the fixing section, the mating section and the fixing section are coaxially connected in sequence and a step portion is formed at the connection position; The filter further includes a filter membrane, and the filter membrane is sandwiched between the liquid outlet and the step portion.

7. The liquid delivery device according to claim 5, characterized in that: The connecting joint is also provided with a clamping portion at the position of the liquid outlet, and the clamping portion is spaced apart from and cooperates with the outer wall of the connecting joint at the corresponding position to form an annular fixing cavity; When the liquid outlet is sealed and connected in the matching section, the corresponding end of the matching section is clamped in the interior of the annular fixing cavity.

8. The liquid delivery device according to any one of claims 1 to 7, characterized in that: The liquid delivery device further comprises a fixed protective cap, on which a plurality of communication ports are arranged, and the flow limiting tube and the infusion tube of each infusion pipeline are detachably connected via the communication ports of the fixed protective cap.

9. The liquid delivery device according to claim 8, characterized in that: The liquid delivery device further comprises a housing, the liquid reservoir, the filter and the flow limiting tube of the liquid infusion pipeline are all fixedly arranged inside the housing, and the liquid infusion tube of the liquid infusion pipeline is arranged outside the housing; The shell is provided with a first through hole and a second through hole at the bottom in the vertical direction, the fixed protective cap is penetrated and fixed at the position of the first through hole, and the liquid outlet of the liquid reservoir is fixed at the position of the second through hole.

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