Liquid injection mechanism and liquid injection device

Abstract

The application relates to the technical field of medical devices, and provides a liquid injection mechanism and a liquid injection device. The liquid injection mechanism comprises a liquid injection assembly and an on-off assembly. The liquid injection assembly is configured to be movable along a direction between a non-piercing position and a piercing position. The liquid injection assembly is provided with a piercing needle and a catheter. The on-off assembly is arranged on the moving path of the liquid injection assembly. The on-off assembly comprises a base and a pressing piece. The base is fixedly arranged relative to the liquid injection assembly. The pressing piece is arranged on the base and forms at least one pressing channel for the catheter to pass through between the base and the pressing piece. The pressing piece is provided with a pushing part extending towards the liquid injection assembly in the non-piercing position. The liquid injection mechanism disclosed by the application can effectively prevent the catheter from being prematurely conducted when the liquid injection assembly does not reach the piercing position, so that external air can be avoided from entering the sterilization cabin before the liquid injection assembly reaches the piercing position, and the reliability during actual liquid injection is improved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically, to an injection mechanism and injection device. Background Technology

[0002] The content in this section provides only background information related to this application and may not constitute prior art.

[0003] Hydrogen peroxide plasma sterilizers are sterilization devices that use hydrogen peroxide as the sterilization medium. Known hydrogen peroxide plasma sterilizers are usually equipped with a liquid injection device to inject hydrogen peroxide solution into the sterilization chamber of the hydrogen peroxide plasma sterilizer.

[0004] A typical injection device for hydrogen peroxide plasma sterilizers includes an injection assembly with a puncture needle. The puncture needle is connected to the sterilization chamber of the hydrogen peroxide plasma sterilizer via a conduit, which is operable. During the injection phase, the injection assembly guides the puncture needle to the solution container holding hydrogen peroxide capsules and punctures the capsules. Simultaneously, the conduit remains open, allowing the negative pressure within the sterilization chamber to automatically draw the hydrogen peroxide solution into the chamber. After each injection, the conduit must be disconnected to prevent excess air from entering the sterilization chamber.

[0005] In related technologies, common injection devices typically add valves (such as solenoid valves) to the conduit to control its opening and closing. This method is not only costly but also has low reliability during injection. To address this, the applicant previously filed a patent application with application number CN2021104938302. The injection device disclosed in this patent uses a mechanical method to control the opening and closing of the conduit, effectively reducing costs and improving reliability during injection.

[0006] Specifically, in this patented technology, the injection device is further provided with a blocking block, and the conduit is locked in the notched mounting groove of the injection component. When the injection component is in the initial non-puncture position, the blocking block can squeeze the conduit locked in the mounting groove through the notch of the mounting groove, thereby causing the conduit to break. Correspondingly, when the injection component moves toward the puncture position (that is, the position where the solution box is located), the conduit can automatically open after the conduit separates from the blocking block. Summary of the Invention

[0007] However, the inventors of this application further discovered that, regarding the injection device disclosed by the applicant in the prior art, when the injection component moves toward the puncture position but has not yet reached the puncture position, the catheter is automatically opened. In this state, excess air from the outside may be drawn into the sterilization chamber under the negative pressure of the sterilization chamber, thereby affecting the reliability of the actual injection and potentially affecting the final sterilization effect.

[0008] Therefore, in order to at least solve the above-mentioned problems, the purpose of this application is to provide an injection mechanism that can effectively prevent the catheter from prematurely opening before the injection component reaches the puncture site. At the same time, this application also provides an injection device using this injection mechanism to improve the reliability of injection.

[0009] The objective of this application is achieved through the following technical solution:

[0010] A liquid injection mechanism, comprising:

[0011] The injection assembly is configured to move in one direction between a non-puncture position and a puncture position; the injection assembly includes a puncture needle and a catheter communicating with the puncture needle.

[0012] An on / off component is disposed on the movement path of the injection component; the on / off component includes:

[0013] The base is fixedly disposed relative to the injection assembly;

[0014] A squeezing member is disposed on the base and forms at least one squeezing channel between the squeezing member and the base for the catheter to pass through; the squeezing member is provided with a pushing portion extending toward the injection assembly in the non-puncture position;

[0015] When the injection assembly is in the non-puncture position, the squeezing member squeezes the catheter in the squeezing channel to disconnect the catheter; when the injection assembly is in the puncture position, the pushing part can be pushed by the injection assembly to release the squeezing member from squeezing the catheter in the squeezing channel.

[0016] In some possible embodiments, the base has a first sidewall and a second sidewall opposite to the first sidewall, the first sidewall facing the injection assembly;

[0017] The extrusion channel is formed in the second sidewall.

[0018] In some possible embodiments, the extruder includes a connecting portion and at least one extrusion portion for forming the extrusion channel, the connecting portion being fixedly disposed relative to the base;

[0019] The extrusion section is made of an elastic material and is connected to the connecting section; the extrusion channel is formed between the extrusion section and the second sidewall, and the pushing section is connected to the extrusion section;

[0020] Specifically, when the injection assembly is in the non-puncture position, the squeezing part squeezes the catheter in the squeezing channel to disconnect the catheter; when the injection assembly is in the puncture position, the pushing part can be pushed by the injection assembly to release the squeezing part from squeezing the catheter in the squeezing channel.

[0021] In some possible embodiments, the number of extrusion portions is two, and the two extrusion portions are arranged opposite each other to form two opposing extrusion channels on the second sidewall;

[0022] The pushing part and the squeezing part correspond one-to-one.

[0023] In some possible embodiments, the connecting portion is U-shaped and parallel to the first sidewall;

[0024] The first sidewall has a receiving groove adapted to the connecting part, and the connecting part is received in the receiving groove; one of the extrusion parts is connected to one end of the connecting part, and the other extrusion part is connected to the other end of the connecting part.

[0025] In some possible embodiments, the extrusion portion is U-shaped and perpendicular to the first sidewall;

[0026] The extrusion section includes a connecting section, an extrusion section, and a pushing section. One end of the connecting section passes through the base and is connected to the corresponding end of the connecting section. The other end of the connecting section is connected to the extrusion section. The extrusion section and the second sidewall form the extrusion channel. One end of the pushing section is connected to the extrusion section. The other end of the pushing section passes through the base and is connected to the corresponding pushing section.

[0027] The connecting section is parallel to the pushing section.

[0028] In some possible embodiments, the base has a placement groove through which the connecting segment passes, the placement groove extending through the top of the base.

[0029] In some possible embodiments, the base is also provided with a limiting groove for the pushing section to pass through, the limiting groove extending in the lateral direction.

[0030] In some possible embodiments, the second sidewall is provided with a slot adapted to the conduit, and the conduit passing through the compression channel is engaged in the slot.

[0031] On the other hand, this application discloses a liquid injection device, including the liquid injection mechanism as described above;

[0032] The injection mechanism further includes:

[0033] The injection drive assembly is configured to drive the injection assembly to move between the non-puncture position and the puncture position.

[0034] The technical solution of this application embodiment has at least the following advantages and beneficial effects:

[0035] The injection mechanism disclosed in this application adds a switching component located on the movement path of the injection component. When the injection component moves from the non-puncture position to the puncture position but before reaching the puncture position, the catheter is always in a disconnected state under the squeezing action of the switching component. This prevents the catheter from being prematurely connected before the injection component reaches the puncture position, thereby minimizing the possibility of external air entering the sterilization chamber before the injection component reaches the puncture position. This improves the reliability of actual injection and helps to improve the final sterilization effect. Attached Figure Description

[0036] Figure 1 Schematic diagrams of the liquid injection device provided for some embodiments of this application;

[0037] Figure 2 Schematic diagrams of the liquid injection mechanism provided for some embodiments of this application;

[0038] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0039] Figure 4 Schematic diagrams of the conduit and the switching assembly provided for some embodiments of this application;

[0040] Figure 5 Schematic diagrams of the on / off components provided for some embodiments of this application;

[0041] Figure 6 A schematic diagram of the on / off component from another perspective, provided for some embodiments of this application;

[0042] Figure 7 Schematic diagrams of the base provided for some embodiments of this application;

[0043] Figure 8 A schematic diagram of the structure of an extrusion member provided for some embodiments of this application.

[0044] Icons: 100-Injection mechanism, 200-Base plate, 300-Solution box drive mechanism, 400-Solution box, 10-Injection assembly, 11-Moving seat, 12-Punch needle, 13-Catheter, 20-Injection drive assembly, 21-Fixed seat, 22-Screw, 23-Drive motor, 24-Barrier block, 30-On / off assembly, 31-Base, 311-First sidewall, 312-Second sidewall, 313-Receiving groove, 314-Limiting groove, 315-Placement groove, 316-Card slot, 32-Extrusion part, 321-Pushing part, 322-Connecting part, 323-Extrusion part, 3231-Connecting section, 3232-Extrusion section, 3233-Pushing section, s-Extrusion channel. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments. The same reference numerals in the accompanying drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0046] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this application may have fewer components, other components not shown in the drawings, different components, differently arranged components, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0047] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components.

[0048] The embodiments of this application disclose a liquid injection device, which can be applied to a hydrogen peroxide plasma sterilizer to inject the hydrogen peroxide solution required for sterilization into the sterilization chamber.

[0049] Figure 1 The diagram shows a schematic of the structure of an exemplary liquid injection device disclosed in the embodiments of this application. In general, the liquid injection device disclosed in the embodiments of this application may include a liquid injection mechanism 100, a base plate 200, a solution box drive mechanism 300, and a solution box 400 storing hydrogen peroxide capsules.

[0050] In the embodiments of this application, both the injection mechanism 100 and the solution cartridge driving mechanism 300 are mounted on the base plate 200, and the solution cartridge 400 is mounted on the solution cartridge driving mechanism 300. Furthermore, the solution cartridge 400 can move along one direction (i.e., under the drive of the solution cartridge driving mechanism 300)... Figure 1 The mechanism moves along the X-axis direction to allow the hydrogen peroxide solution in the solution box 400, which is arranged in a straight line along the X-axis direction, to be injected into the sterilization chamber when hydrogen peroxide solution needs to be injected into the chamber. This is achieved by the injection mechanism 100 sequentially injecting the hydrogen peroxide solution from the hydrogen peroxide capsules on the solution box 400 into the sterilization chamber.

[0051] It should be noted that the embodiments of this application do not improve the solution box drive mechanism 300 and the solution box 400. Therefore, the specific structure and working principle of the solution box drive mechanism 300 and the solution box 400 can be referred to the contents disclosed in the applicant's prior patent documents listed in the background art section of this application, and will not be elaborated here.

[0052] Furthermore, the injection mechanism 100 is used to puncture the hydrogen peroxide capsules on the solution box 400 in sequence, so as to inject the hydrogen peroxide solution in a single hydrogen peroxide capsule into the sterilization chamber in one go.

[0053] Specifically, the injection mechanism 100 may include an injection assembly 10 and an injection drive assembly 20. The injection assembly 10 is configured to be able to move in one direction (i.e., Figure 1 The Y-axis direction (as shown) moves between the non-puncture position and the puncture position. Specifically, as... Figure 2 As shown, the injection assembly 10 may include a movable seat 11 that can move between a non-puncture position and a puncture position along the Y-axis. The movable seat 11 of the injection assembly 10 is provided with a puncture needle 12 for puncturing the hydrogen peroxide capsule and a catheter 13 that communicates with the puncture needle 12. In practical applications, the catheter 13 is connected to the sterilization chamber, and the catheter 13 can also be connected or disconnected as needed.

[0054] It is understood that the non-puncture position mentioned in this application embodiment refers to the position of the injection component 10 when the puncture needle 12 has not punctured the corresponding hydrogen peroxide capsule. Conversely, the puncture position refers to the position of the injection component 10 when the puncture needle 12 has just punctured the corresponding hydrogen peroxide capsule. In other words, before the puncture needle 12 of the injection component 10 punctures the corresponding hydrogen peroxide capsule, multiple possible positions of the injection component 10 are non-puncture positions. When the injection component 10 is in a non-puncture position, the conduit 13 should be kept disconnected to prevent external air from entering the sterilization chamber through the puncture needle 12 and the conduit 13. Correspondingly, when it is necessary to inject hydrogen peroxide solution into the sterilization chamber, it is only necessary to move the injection component 10 to the puncture position so that the puncture needle 12 punctures the corresponding hydrogen peroxide capsule. At this time, the conduit 13 should be in a conductive state. After that, the hydrogen peroxide solution in the hydrogen peroxide capsule can flow sequentially through the puncture needle 12 and the conduit 13 under the negative pressure of the sterilization chamber to reach the sterilization chamber.

[0055] The injection drive assembly 20 is configured to drive the movable seat 11 of the injection assembly 10 along... Figure 1 The Y-axis direction, as shown, moves between the non-puncture position and the puncture position, thereby achieving the aforementioned fluid injection function. For example... Figure 2 As shown, the injection drive assembly 20 may include components such as a fixed base 21, a lead screw 22, and a drive motor 23. The fixed base 21 can be fixedly mounted on the base plate 200. The movable seat 11 of the injection assembly 10 is slidably connected to the fixed base 21, allowing the movable seat 11 to move between a non-puncture position and a puncture position in a sliding manner. The lead screw 22 is rotatably mounted on the fixed base 21, with its axial direction parallel to the movement path of the movable seat 11. The lead screw 22 passes through the movable seat 11 and is threadedly connected to it. The drive motor 23 is drively connected to the lead screw 22, driving the lead screw 22 to rotate. Thus, when the drive motor 23 drives the lead screw 22 to rotate, the movable seat 11 can move between the non-puncture position and the puncture position along the axial direction of the lead screw 22.

[0056] Based on this, in order to control the opening and closing of conduit 13 without using additional components such as valves, refer to Figure 2 As shown, the known method (i.e., the method disclosed in the applicant's prior patent applications listed in the background section of this application) involves providing a blocking block 24 on the fixed base 21 to cooperate with the injection component 10 in its initial non-puncture position. Simultaneously, a mounting groove for holding the catheter 13 is provided on the movable base 11 of the injection component 10, and the mounting groove has a notch that aligns with the blocking block 24. Thus, when the injection component 10 is in its initial non-puncture position (i.e.,... Figure 2When the position shown is reached, the blocking block 24 can squeeze the conduit 13 through the notch of the mounting groove to disconnect the conduit 13; correspondingly, when the injection assembly 10 moves toward the puncture position under the drive of the injection drive assembly 20, and the conduit 13 disengages from the blocking block 24, the conduit 13 can be automatically opened.

[0057] It is worth noting that although this method can mechanically control the opening and closing of the catheter 13, thereby reducing costs and improving the reliability of injection, the inventors of this application have further discovered that, in this method, when the injection component 10 moves from the initial non-puncture position to the puncture position but has not yet reached the puncture position, the catheter 13 is already automatically open. In this case, since the injection component 10 has not yet reached the puncture position and the puncture needle 12 has not yet punctured the corresponding hydrogen peroxide capsule, excess external air may enter the sterilization chamber through the puncture needle 12 and the catheter 13 at this time, thereby affecting the reliability of injection. Furthermore, the entry of external air into the sterilization chamber may also affect the final sterilization effect.

[0058] Therefore, please refer to Figures 2 to 8 The embodiments of this application also disclose an improved injection mechanism 100, which can effectively prevent the catheter 13 from being connected in advance before the injection component 10 reaches the puncture position. Thus, before the injection component 10 reaches the puncture position, it can always effectively prevent external air from entering the sterilization chamber through the puncture needle 12 and the catheter 13, thereby further improving the reliability of injection and the final sterilization effect.

[0059] Specifically, the injection mechanism 100 disclosed in the embodiments of this application may further include an on / off assembly 30 for mechanically controlling the opening and closing of the catheter 13. For example... Figure 2 As shown, the on / off component 30 is disposed on the moving path of the injection component 10. Preferably, the on / off component 30 can be disposed at the end of the fixed seat 21 of the injection drive component 20 away from the blocking block 24, so that the structure of the entire injection mechanism 100 is more compact.

[0060] Furthermore, in combination Figures 4 to 6 As shown, the on / off assembly 30 may include a base 31 and a compression member 32. The base 31 is fixedly disposed relative to the injection assembly 10. The compression member 32 is disposed on the base 31, and at least one compression channel s for the conduit 13 to pass through is formed between the compression member 32 and the base 31. Figure 2 and Figure 3 As shown, the extruder 32 is also provided with a pusher 321 extending toward the injection assembly 10 in the non-puncture position, which is aligned with the movable seat 11 of the injection assembly 10.

[0061] When the injection assembly 10 is in the non-puncture position, the squeezing member 32 squeezes the conduit 13 in the squeezing channel s to disconnect the conduit 13; when the injection assembly 10 is in the puncture position, the pushing part 321 can be pushed by the injection assembly 10 to release the squeezing member 32 from squeezing the conduit 13 in the squeezing channel s, thereby making the conduit 13 open.

[0062] In other words, combining Figure 2 and Figure 4 As shown, when the injection assembly 10 is in the non-puncture position, the squeezing member 32 can apply squeezing force to the catheter 13 passing through the squeezing channel s. At this time, the catheter 13 in the squeezing channel s is in a disconnected state under the squeezing force applied by the squeezing member 32. Based on this, combined with the above description, when the injection assembly 10 moves towards the puncture position but has not yet reached the puncture position, since the catheter 13 in the squeezing channel s is always in a disconnected state under the squeezing action of the squeezing member 32, even if the catheter 13 is separated from the blocking block 24 due to the movement of the injection assembly 10, the part of the catheter 13 passing through the squeezing channel s is always in a disconnected state, so that external air cannot flow through the puncture needle 12 and the catheter 13 into the sterilization chamber. Correspondingly, as the injection assembly 10 moves toward the puncture position, since the movable seat 11 of the injection assembly 10 is aligned with the push portion 321 on the squeeze member 32, when the injection assembly 10 moves to the puncture position, the movable seat 11 can push the push portion 321 of the squeeze member 32, thereby causing the squeeze member 32 to release the squeezing force acting on the catheter 13 in the squeezing channel s, thereby making the catheter 13 open.

[0063] As can be seen, the injection mechanism 100 disclosed in this application further provides an on / off component 30 on the moving path of the injection component 10. When the injection component 10 moves from the non-puncture position to the puncture position but before reaching the puncture position, the catheter 13 is always in the off state under the action of the squeezing member 32 of the on / off component 30. This can prevent external air from entering the sterilization chamber through the puncture needle 12 and the catheter 13 before the injection component 10 reaches the puncture position as much as possible, thereby improving the reliability of actual injection and helping to improve the final sterilization effect.

[0064] Meanwhile, the on / off component 30 added to the injection mechanism 100 in this embodiment can also mechanically control the on / off state of the catheter 13. On the basis of effectively reducing costs and improving injection reliability, in conjunction with the aforementioned barrier block 24 design for controlling the on / off state of the catheter 13, it can ensure that when the moving seat 11 of the injection component 10 is in the initial non-puncture position, multiple parts of the catheter 13 are in the disconnected state, thereby further effectively preventing external air from entering the sterilization chamber when the injection component 10 is in the initial non-puncture position.

[0065] In some embodiments of this application, combined with Figure 2 As shown, the base 31, which is fixedly disposed relative to the injection assembly 10, can be fixedly disposed at the end of the fixing base 21 away from the barrier block 24, and the base 31 and the fixing base 21 can be detachably connected by corresponding fasteners. Furthermore, in conjunction with... Figure 5 and Figure 6 As shown, the base 31 has a first sidewall 311 and a second sidewall 312 opposite to the first sidewall 311. The first sidewall 311 faces the injection assembly 10, that is, the side of the base 31 facing the injection assembly 10 serves as the first sidewall 311. At this time, the extrusion channel s formed between the extruder 32 and the base 31 is located on the second sidewall 312. In this way, the structure of the injection mechanism 100 can be made more compact, and it is also beneficial to the arrangement of the conduit 13.

[0066] Furthermore, in some embodiments of this application, the extrusion member 32 can be implemented in the manner described below. Specifically, in conjunction with Figure 5 and Figure 6 As shown, the extruder 32 may further include a connecting portion 322 and at least one extrusion portion 323 for forming an extrusion channel s. The connecting portion 322 is fixedly disposed relative to the base 31. The extrusion portion 323 is made of an elastic material and is connected to the connecting portion 322. At this time, an extrusion channel s is formed between the extrusion portion 323 and the second side wall 312 of the base 31. That is, there is a one-to-one correspondence between the extrusion portion 323 and the extrusion channel s. A single extrusion portion 323 can form an extrusion channel s for the conduit 13 to pass through between it and the second side wall 312 of the base 31. The aforementioned pushing portion 321 is connected to the extrusion portion 323.

[0067] Thus, in conjunction with the foregoing, when the injection component 10 is in a non-puncture position, such as Figure 4 As shown, the conduit 13 in the compression channel s can be disconnected by squeezing the compression part 323, which has elastic deformation capability. Correspondingly, when the moving seat 11 of the injection assembly 10 moves from the non-puncture position to the puncture position and reaches the puncture position, the moving seat 11 of the injection assembly 10 can push the pushing part 321 of the compression member 32. At this time, since the compression part 323 has elastic deformation capability, the pushing part 321 will drive the compression part 323 to move so that the compression part 323 undergoes elastic deformation, thereby releasing the compression of the conduit 13 in the compression channel s, and thus making the conduit 13 in the compression channel s open.

[0068] Correspondingly, after a single injection operation is completed, the injection assembly 10 moves from the puncture position to the non-puncture position. During this process, when the moving seat 11 moves to the point where it disengages from the push part 321 of the squeezing member 32, the squeezing part 323 can recover its deformation and squeeze the conduit 13 in the squeezing channel s again, thereby causing the conduit 13 to disconnect again in order to prepare for the next injection.

[0069] In actual implementation, there can be two extrusion sections 323, and the two extrusion sections 323 are arranged opposite to each other. In this way, two opposing extrusion channels s can be formed between the two extrusion sections 323 and the second side wall 312 of the base 31. At this time, as Figure 4 As shown, the conduit 13 located on the second side wall 312 of the base 31 is generally bent into an inverted U-shape so that the conduit 13 can pass through the two extrusion channels s respectively.

[0070] By configuring two squeezing portions 323 to form two opposing squeezing channels s on the second sidewall 312 of the base 31, when the injection assembly 10 is in the non-puncture position, two different portions of the catheter 13 located on the second sidewall 312 of the base 31 can be squeezed by the two squeezing portions 323 respectively, thereby forming two disconnected positions on the catheter 13. It is understood that this approach helps to further ensure that the catheter 13 is reliably disconnected when the injection assembly 10 is in the non-puncture position. Furthermore, when the elastic deformation capability of one squeezing portion 323 decreases or fails, such that the squeezing portion 323 cannot reliably control the opening and closing of the catheter 13, the other squeezing portion 323 can still reliably control the opening and closing of the catheter 13, thereby further improving the stability and reliability of the on / off assembly 30 during application.

[0071] Based on this, in order to facilitate the simultaneous elastic deformation of the two squeezing parts 323 when the injection assembly 10 is in the puncture position, thereby enabling the two portions of the catheter 13 squeezed by the two squeezing parts 323 to be simultaneously connected, the aforementioned pushing part 321 corresponds one-to-one with the squeezing part 323. That is to say, combined with Figure 8 As shown, each squeezing part 323 is connected to a pusher part 321 extending toward the injection assembly 10. When the injection assembly 10 moves to the puncture position, the moving seat 11 can push the two pushers 321 at the same time, so that the two squeezing parts 323 connected to the two pushers 321 respectively undergo elastic deformation at the same time, thereby making the two parts of the catheter 13 squeezed by the two squeezing parts 323 simultaneously open.

[0072] In some embodiments of this application, when there are two extrusion portions 323, in order to improve the stability of the extrusion member 32 when it is mounted on the base 31, combined with Figure 6 and Figure 8As shown, the connecting portion 322 constituting the extrusion member 32 can be U-shaped, and the connecting portion 322 is parallel to the first side wall 311 of the base 31. That is to say, the connecting portion 322 can be a vertical U-shaped structure, and the plane where the connecting portion 322 is located is parallel to the first side wall 311 of the base 31.

[0073] At this time, refer to Figure 7 As shown, the first sidewall 311 of the base 31 has a receiving groove 313 adapted to the connecting part 322. The receiving groove 313 is a groove that is recessed from the first sidewall 311 of the base 31 towards the second sidewall 312, and the connecting part 322 is received in the receiving groove 313. At this time, for the two pressing parts 323, one pressing part 323 is connected to one end of the connecting part 322, and the other pressing part 323 is connected to the other end of the connecting part 322.

[0074] It is understandable that, in actual implementation, when the base 31 is connected to the fixed base 21, such as Figure 2 As shown, the first sidewall 311 of the base 31 should be tightly attached to the outer wall of the fixed seat 21 away from the barrier block 24. This allows the U-shaped connecting portion 322 to be reliably confined within the receiving groove 313 by the cooperation of the fixed seat 21 and the base 31. This ensures that when the moving seat 11 of the injection assembly 10 pushes the pushing portion 321 of the extruder 32, only the extruder 323 undergoes elastic deformation, while the connecting portion 322 remains stationary. This simplifies the installation process of the extruder 32. In this case, the entire extruder 32 can be a single, independent component. Figure 8 As shown, the connecting part 322, the two extrusion parts 323 and the two pushing parts 321 constituting the extrusion part 32 can be an integral structure, thereby simplifying the structure of the extrusion part 32 as much as possible and reducing the manufacturing and use cost of the extrusion part 32.

[0075] Meanwhile, in order to ensure that the extrusion section 323 with elastic deformation capability applies a more reliable extrusion force to the conduit 13, in some embodiments of this application, combined with Figure 8 As shown, the extrusion part 323 can also be U-shaped, and the extrusion part 323 is perpendicular to the first side wall 311 of the base 31. That is to say, the extrusion part 323 can be a horizontal U-shaped structure.

[0076] Furthermore, the extrusion section 323 may include a connecting section 3231, an extrusion section 3232, and a pushing section 3233. One end of the connecting section 3231 passes through the base 31 and connects to the corresponding end of the connecting section 322. The other end of the connecting section 3231 connects to the extrusion section 3232. The extrusion section 3232 is substantially parallel to the second sidewall 312 of the base 31 and forms an extrusion channel s between itself and the second sidewall 312. One end of the pushing section 3233 connects to the extrusion section 3232, and the other end of the pushing section 3233 passes through the base 31 and connects to the corresponding pushing section 321. The connecting section 3231 and the pushing section 3233 are substantially parallel.

[0077] Thus, when the injection assembly 10 is in the non-puncture position, for a single compression part 323, a reliable elastic compression force can be applied to the catheter 13 passing through the compression channel s through the generally horizontal compression section 3232, so that the catheter 13 can be reliably disconnected. Correspondingly, when the injection assembly 10 reaches the puncture position to push the corresponding push part 321 by the moving seat 11, the compression section 3232 of the compression part 323 (specifically, the connection between the compression section 3232 and the connecting section 3231) will undergo elastic deformation, so that the catheter 13 in the compression channel s formed by the compression part 323 is open. Furthermore, by setting the connecting section 3231 to be substantially parallel to the push section 3233, it is advantageous that when the push part 321 corresponding to a single compression part 323 is pushed by the moving seat 11 of the injection assembly 10, only the compression section 3232 of the compression part 323 undergoes elastic deformation, thereby improving the service life of the compression part 32.

[0078] Meanwhile, considering that when the pusher section 321 corresponding to a single extrusion section 323 is pushed by the moving seat 11 of the injection assembly 10, the pusher section 3233 of the extrusion section 323 may undergo lateral displacement, therefore, in some embodiments of this application, referring to Figure 7 As shown, the base 31 is also provided with a limiting groove 314 through which the pushing section 3233 of the extrusion part 323 passes, that is, combined with Figure 5 or Figure 6 As shown, the end of the push section 3233 furthest from the extrusion section 3232 first passes through the limiting groove 314 on the base 31 and then extends towards the injection assembly 10 in the non-puncture position, connecting with the corresponding push part 321. Furthermore, the limiting groove 314 extends in the lateral direction (which can also be understood as the width direction of the base 31), thus limiting the push section 3233 of the extrusion part 323 and providing sufficient clearance for possible lateral displacement of the push section 3233.

[0079] At the same time, in actual implementation, combined with Figure 3 or Figure 8The contents shown indicate that one end of the pushing portion 321 away from the squeezing portion 323 (that is, the end of the pushing portion 321 near the moving seat 11 of the injection assembly 10) can be configured to be bent inward, so that when the injection assembly 10 reaches the puncture position, the moving seat 11 can reliably push the pushing portion 321. At this point, continue referring to... Figure 7 Alternatively, a notch can be provided at the top of the limiting groove 314 for the push section 3233 to enter the limiting groove 314, so that the push section 3233 can enter the limiting groove 314 during the installation of the extrusion part 32, which will be described below, thereby improving the convenience of installing the extrusion part 32.

[0080] Furthermore, to facilitate the installation of the extrusion part 32 onto the base 31, refer to... Figure 7 As shown, in some embodiments of this application, for a single extrusion section 323, the base 31 is also provided with a placement groove 315 for the connecting section 3231 to pass through. That is, the end of the connecting section 3231 away from the extrusion section 3232 first passes through the placement groove 315 on the base 31 and then connects with the corresponding end of the connecting section 322. Furthermore, the placement groove 315 is provided through the top of the base 31 along the height direction of the base 31.

[0081] Thus, when the extruder 32 needs to be installed onto the base 31, first align the connecting sections 3231 of the two extrusion portions 323 of the extruder 32 with the two placement slots 315 on the base 31, and align the pushing sections 3233 of the two extrusion portions 323 with the notches at the top of the two limiting slots 314 on the base 31. Then, the extruder 32 can be inserted into the base 31 from top to bottom, so that the connecting sections 3231 of the two extrusion portions 323 enter the two placement slots 315, and the pushing sections 3233 of the two extrusion portions 323 enter the two limiting slots 314. After the connecting sections 3231 and pushing sections 3233 of the two extrusion portions 323 are installed in place, the connecting part 322 can be inserted into the receiving slot 313 located on the first side wall 311 of the base 31. At this time, the entire switching assembly 30 will be in a state of... Figure 5 or Figure 6 The state shown is as follows. Then, the base 31 can be installed on the end of the fixed seat 21 away from the blocking block 24, so that the first side wall 311 of the base 31 is in close contact with the outer wall of the fixed seat 21 away from the blocking block 24, thereby restricting the displacement of the connecting part 322.

[0082] Furthermore, in some embodiments of this application, combined with Figure 4 and Figure 5As shown, a slot 316 adapted to the conduit 13 can also be provided on the second side wall 312 of the base 31, and the number of slots 316 can correspond to the number of extrusion parts 323. For example, in the case of the extruder 32 with two extrusion parts 323 shown in this application, two slots 316 can be provided on the base 31 so that the conduit 13 passing through the two extrusion channels s can be respectively inserted into the two slots 316, thereby improving the stability of the conduit 13 located on the second side wall 312 of the base 31.

[0083] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A liquid injection mechanism, characterized in that, include: The injection assembly is configured to move in one direction between a non-puncture position and a puncture position. The injection assembly is equipped with a puncture needle and a catheter communicating with the puncture needle; An on / off component is disposed on the movement path of the injection component; the on / off component includes: A base is fixedly disposed relative to the injection assembly; the base has a first sidewall and a second sidewall opposite to the first sidewall, the first sidewall facing the injection assembly; A squeezing member is disposed on the base and forms at least one squeezing channel between the squeezing member and the base for the catheter to pass through; the squeezing member has a pushing portion extending toward the injection assembly in the non-puncture position; the squeezing channel is formed in the second sidewall; The extrusion member includes a connecting portion and at least one extrusion portion for forming the extrusion channel, the connecting portion being fixedly disposed relative to the base; the extrusion portion is made of an elastic material and is connected to the connecting portion; the extrusion channel is formed between the extrusion portion and the second sidewall, and the pushing portion is connected to the extrusion portion; Specifically, when the injection assembly is in the non-puncture position, the squeezing part squeezes the catheter in the squeezing channel to disconnect the catheter; when the injection assembly is in the puncture position, the pushing part can be pushed by the injection assembly to release the squeezing part from squeezing the catheter in the squeezing channel.

2. The injection mechanism according to claim 1, characterized in that, The number of extrusion sections is two, and the two extrusion sections are arranged opposite to each other to form two opposing extrusion channels on the second sidewall; The pushing part and the squeezing part correspond one-to-one.

3. The injection mechanism according to claim 2, characterized in that, The connecting part is U-shaped and parallel to the first sidewall; The first sidewall has a receiving groove adapted to the connecting part, and the connecting part is received in the receiving groove; one of the extrusion parts is connected to one end of the connecting part, and the other extrusion part is connected to the other end of the connecting part.

4. The injection mechanism according to claim 3, characterized in that, The extrusion section is U-shaped and perpendicular to the first sidewall; The extrusion section includes a connecting section, an extrusion section, and a pushing section. One end of the connecting section passes through the base and is connected to the corresponding end of the connecting section. The other end of the connecting section is connected to the extrusion section. The extrusion section and the second sidewall form the extrusion channel. One end of the pushing section is connected to the extrusion section. The other end of the pushing section passes through the base and is connected to the corresponding pushing section. The connecting section is parallel to the pushing section.

5. The injection mechanism according to claim 4, characterized in that, The base has a placement groove for the connecting section to pass through, and the placement groove extends through the top of the base.

6. The injection mechanism according to claim 4, characterized in that, The base is also provided with a limiting groove for the pushing section to pass through, and the limiting groove extends in the lateral direction.

7. The injection mechanism according to claim 1, characterized in that, The second sidewall is provided with a slot that is adapted to the conduit, and the conduit passing through the compression channel is locked in the slot.

8. A liquid injection device, characterized in that, Includes the injection mechanism as described in any one of claims 1 to 7; The injection mechanism further includes: The injection drive assembly is configured to drive the injection assembly to move between the non-puncture position and the puncture position.

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