Detachable injector

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a detachable injector which comprises a shell, a dispensing mechanism, an infusion catheter and a motor, a first fixing seat is fixedly arranged at one end of an output shaft of the motor, and a mounting block is arranged at the end, close to the first fixing seat, of the dispensing mechanism. The first fixing seat comprises a connecting part, a mounting part and an elastic piece used for locking the mounting block, the connecting part is provided with an opening matched with the mounting block, a cavity allowing the mounting block to rotate is reserved between the connecting part and the mounting part, a groove is formed in the mounting part, one end of the elastic piece is fixedly arranged in the groove, and the other end of the elastic piece is fixedly arranged in the groove. According to the scheme, the mounting block is matched with the first fixing base, the connecting piece, the second fixing base and the like, and the detachable syringe which can effectively resist vibration and is more convenient and faster to disassemble is comprehensively provided.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to a detachable syringe. Background Art

[0002] Needle-free injection is an injection method without a traditional capillary needle. It does not require a needle to pierce the flesh. Instead, the needle-free injection pusher generates a certain pressure through a mechanically stable driving module, and under the action of pressure, the drug solution is diffused and injected into the subcutaneous tissue of the injection object. The needle-free injection device can inject target molecules at various tissue depths ranging from the dermis to the muscle according to the force generated by the syringe. It is usually used for large-scale vaccination in animals. Although the needle-free injection device is more complicated than the needle syringe device, the needle-free injection device has significant advantages.

[0003] Since the medicine is an active vaccine, the syringe needs to be cleaned and disinfected in time before and after use to avoid cross infection. However, most of the existing electric syringes can only be disassembled as a whole, which brings great inconvenience to large livestock farms due to the need for frequent disinfection and cleaning when used.

[0004] To this end, the utility model with application number 202020232357.3 discloses a needle-free syringe, comprising an injection part and a power part, the injection part and the power part are detachably connected, the injection part comprises an injection shell, one end of the injection shell is fixedly connected with an injection head, the injection head penetrates the injection shell, and the part of the injection head located in the cavity of the injection shell is a tip; a medicine capsule is detachably connected to the cavity of the injection shell, and the end surface of the medicine capsule and the tip of the injection head are made of medical soft pierceable material; the other end of the medicine capsule is adapted to the power part; this scheme avoids the reuse of a fixed medicine cavity by providing a replaceable medicine capsule, and reduces the workload of cleaning and disinfection after the injection is completed, but its injection head cannot be disassembled and cleaned, so the residual medicine on the injection head will still cause pollution.

[0005] Another invention with application number CN201710416394.2 discloses a detachable device for an electric needle syringe, comprising a syringe housing, a hexagonal fixing sleeve, a syringe cylinder, a piston, a piston rod, a wedge ring and a locking nut; the syringe housing has three positioning surfaces for positioning the hexagonal fixing sleeve, the hexagonal fixing sleeve has an internal thread, and the syringe cylinder has an external thread for connecting with the hexagonal fixing sleeve; the piston rod is connected to the connecting plate through a hexagonal nut; the front end of the piston rod has a ball head structure for cooperating with the groove at the rear end of the piston, and when the piston rod is pushed forward, the ball head slides in the groove to ensure that the piston rod and the piston will not get stuck. , when disassembling, the piston is taken out without disassembling the piston rod, and the hose and the hose connector are connected and then connected to the syringe cylinder through the hose connector; there is a gap between the syringe cylinder and the syringe housing, and the gap size is equal to the front end of the wedge ring. The wedge ring prevents the syringe cylinder and the syringe housing from rotating relative to each other through an interference fit, and the wedge ring is provided with a hook for disassembling the wedge ring; this scheme can realize the disassembly of the syringe cylinder, the glass tube and the piston by rotating the locking nut, which is convenient for cleaning and disinfecting the piston and the glass tube, but it adopts the method of rotating the locking nut for disassembly and fixing, which is cumbersome to operate and has low efficiency.

[0006] Therefore, there is an urgent need for a needle-free syringe that is more convenient and quick to disassemble to solve the above problems. Utility Model Content

[0007] The utility model aims to provide a detachable syringe to solve the problem that the existing syringe cannot be disassembled or is inconvenient to disassemble.

[0008] In order to solve the technical problems mentioned above, the utility model specifically adopts the following technical solutions: a detachable syringe, comprising a shell, a dispensing mechanism, an infusion catheter and a motor, wherein the dispensing mechanism is arranged inside the shell, the motor is fixed inside the shell, the infusion catheter is connected with the dispensing mechanism to provide liquid medicine to the dispensing mechanism, a first fixing seat is fixedly arranged at one end of the output shaft of the motor, a mounting block is arranged at one end of the dispensing mechanism close to the first fixing seat, the first fixing seat comprises a connecting portion, a mounting portion and an elastic member for locking the mounting block, the connecting portion is provided with an opening matching the mounting block, and a space for the mounting block is left between the connecting portion and the mounting portion. The block is rotated in a cavity, the mounting portion is provided with a groove, one end of the elastic member is fixedly arranged in the groove, and the mounting block is provided with a mounting hole that cooperates with the elastic member; when the mounting block enters the opening from a first angle, the elastic member is staggered from the mounting hole, at which time the elastic member is in an initial state, and the free end of the elastic member extends out of the groove; when the mounting block is rotated, the elastic member is compressed by the pressure of the mounting block; when the mounting block is rotated to a second angle, the groove is aligned with the mounting hole, at which time the pressure of the mounting block on the elastic member is reduced, thereby causing the free end of the elastic member to extend into the mounting hole to connect the mounting block and the first fixing seat.

[0009] As an improvement, the elastic member includes a third spring and a movable block, one end of the third spring is fixedly disposed inside the groove, and the other end is fixedly connected to the movable block. When the elastic member is not subject to external force, a part of the movable block is located outside the groove.

[0010] As an improvement, a connecting piece is further provided between the first fixing seat and the motor. The connecting piece is a connecting piece with a hollow interior and a length of 50-60 mm. One end of the connecting piece is fixedly connected to the motor, and the other end is fixedly connected to the first fixing seat.

[0011] As an improvement, a second fixing seat is further provided between the connecting member and the motor, and the second fixing seat is respectively fixed to the housing, the motor and the connecting member.

[0012] As an improvement, the dispensing mechanism includes a main body for containing liquid, and a liquid inlet and a liquid outlet fixedly arranged on the main body and connected with the main body, a first one-way valve is arranged in the liquid inlet, a second one-way valve is arranged in the liquid outlet, a piston is movably arranged inside the main body, a piston rod is fixedly arranged on one side of the piston connected to the motor, and the free end of the piston rod passes through the interior of the connecting piece and is fixedly connected to the output shaft of the motor.

[0013] As an improvement, it further comprises a fixing rod, which passes through the main body and the first fixing seat in sequence and is used to fix the main body and the first fixing seat.

[0014] As an improvement, the liquid inlet is composed of an upper part and a lower part from the liquid inlet end to the liquid outlet end, the diameter of the upper part is larger than the diameter of the lower part, and a first step is formed at the connection between the upper part and the lower part; the liquid outlet is composed of a right part and a left part from the liquid inlet end to the liquid outlet end, the diameter of the right part is larger than the diameter of the left part, and a second step is formed at the connection between the right part and the left part.

[0015] As an improvement, the first one-way valve includes a first spring and a first blocking block, the first spring is sleeved on the first blocking block, and the cross-sectional shape of the first blocking block is an arrow shape facing the infusion catheter; the second one-way valve includes a second spring and a second blocking block, the second spring is sleeved on the second blocking block (for example, the second connecting section of the second blocking block extends into the inner side of the second spring), and the cross-sectional shape of the second blocking block is an arrow shape facing the main body; the end where the liquid outlet is connected to the main body gradually becomes smaller and becomes funnel-shaped, and the inclination angle is consistent with the inclination angle of the pointed part of the second blocking block; a rubber gasket is provided at the end where the liquid inlet is connected to the infusion catheter, and a through hole is provided between the rubber gasket and the corresponding part of the infusion catheter, and when the syringe is in the injection state, the pointed part of the first blocking block is located in the through hole.

[0016] As an improvement, a mounting groove is provided on the side wall of the piston, two retaining rings are provided in the mounting groove, and an O-ring is provided between the two retaining rings.

[0017] As an improvement, a transition zone is provided at the second end of the main body, and correspondingly, a docking position corresponding to the transition zone is provided at the first end of the connector, and when the main body is fixedly connected to the connector, the transition zone is snapped into the docking position; wherein, the inner diameter of the transition zone gradually increases in the direction from the first end to the second end, and the inner diameter of the transition zone is larger than the inner diameter of the connector cavity; the inner wall of the cavity at the first end of the main body is configured to be pointed, and the inner diameter of the pointed portion of the main body gradually decreases in the direction from the second end to the first end of the main body.

[0018] The principle and beneficial effect of the utility model are as follows: the solution cooperates the mounting block with the first fixing seat, and simultaneously sets a connecting piece and a second fixing seat in sequence between the first fixing seat and the motor, and fixes the second fixing seat to the motor, thereby comprehensively providing a detachable syringe that can effectively resist vibration and is more convenient and quick to disassemble.

[0019] In the prior art, the various components of the syringe are fixed by bolts, so when disassembling, the bolts need to be removed one by one, which is troublesome. In the present solution, a self-locking first fixing seat is provided, and when in use, it is only necessary to align the mounting block with the fixing seat and then rotate and lock it, thereby realizing one-button disassembly, which is more convenient and quick.

[0020] At the same time, compared with needle injection, needle-free injection requires a greater pressure on the liquid medicine to enable the liquid medicine to penetrate the skin, so a high-power motor is required as the power source, and needle-free injection is usually performed continuously, that is, the motor needs to operate continuously to drive the piston to move, and the motor will generate greater vibration during operation. This solution uses a second fixing seat, a connector, and a first fixing seat that are sequentially connected to the motor to form a self-locking quick-release connection with the main body, and limits the main body through the fixing seat and the fixing rod, thereby effectively improving the working stability of the detachable dispensing mechanism under frequent strong vibration conditions. At the same time, the design of the pointed piston and the transition zone in coordination can enable the connector and the fixing seat to be quickly docked during the detachable installation process, that is, the installation process is more convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A three-dimensional diagram of the overall structure of an embodiment of the utility model;

[0023] Figure 2 A cross-sectional view of the overall structure of an embodiment of the utility model;

[0024] Figure 3 A cross-sectional view of a dispensing mechanism portion of an embodiment of the utility model;

[0025] Figure 4 It is an enlarged structural cross-sectional view of the injection end of an embodiment of the utility model;

[0026] Figure 5 It is an enlarged structural schematic diagram of the first or second one-way valve in the embodiment of the utility model;

[0027] Figure 6 This is a schematic diagram of the dispensing mechanism during installation in the embodiment of the utility model;

[0028] Figure 7 This is a schematic diagram of the dispensing mechanism after installation in the embodiment of the utility model;

[0029] Figure 8 It is a cross-sectional view of the first mounting seat in the embodiment of the utility model;

[0030] Fig. 9 It is a schematic diagram of the installation of the first or second one-way valve in the embodiment of the utility model.

[0031] Markings in the figure: 1. medicine bottle; 2. mounting seat; 3. control panel; 4. infusion catheter; 5. dispensing mechanism; 51. main body; 52. liquid inlet; 521. first spring; 522. first blocking block; 53. liquid outlet; 531. second spring; 532. second blocking block; 6. motor; 7. exhaust valve; 8. telescopic part; 9. induction switch; 10. piston; 11. limiting protrusion; 12. mounting block; 13. first fixed seat; 131. third spring; 132. movable block; 133. connecting part; 134. mounting part; 14. connecting part; 15. second fixed seat. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] Herein, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present invention, and have no specific meanings. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0034] In this document, the terms "upper", "lower", "inner", "outer", "front", "rear", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0035] In this document, unless otherwise clearly specified or limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0036] Herein "and / or" includes any and all combinations of one or more of the associated listed items.

[0037] Herein, "plurality" means two or more than two, ie, it includes two, three, four, five, etc.

[0038] This embodiment is basically as shown in the attached Figure 1-9 As shown:

[0039] like Figure 1 , Figure 2 As shown, the utility model provides a detachable syringe, including a shell, a dispensing mechanism 5, an infusion catheter 4 and a motor 6, wherein the motor 6 is fixed on the shell, and the dispensing mechanism 5 is detachably arranged at the output end of the motor 6, the infusion catheter 4 is connected with the dispensing mechanism 5 for providing liquid medicine to the dispensing mechanism 5, and the free end of the infusion catheter 4 extends out of the shell, and a mounting seat 2 for mounting a medicine bottle 1 is arranged at its free end, and an exhaust valve 7 for exhausting the air inside the medicine bottle 1 is also arranged, and the range of a single drug dispensing of the syringe is 0.2-2ml, and a control panel 3 is arranged outside the shell for convenient operation.

[0040] like Figure 3 , Figure 4 The dispensing mechanism 5 includes a main body 51 for containing the medicinal solution, a liquid inlet 52 arranged above the main body 51 and connected thereto, and a liquid outlet 53 arranged at the injection end and connected to the main body 51, wherein the length of the main body 51 is 55-60 mm, the liquid inlet 52 is an upper part and a lower part from the liquid inlet end to the liquid outlet end, the inner diameter of the upper part is greater than the inner diameter of the lower part, and a first step is formed at the connection between the upper part and the lower part; the liquid outlet 53 is a cylindrical right part and a left part from the liquid inlet end to the liquid outlet end, the inner diameter of the right part is greater than the inner diameter of the left part, and a second step is formed at the connection between the right part and the left part.

[0041] In some embodiments, the end of the right portion connected to the main body 51 gradually becomes smaller and funnel-shaped, and its inclination angle is the same as or similar to the inclination angle of the pointed part of the second blocking block 532, so that when the liquid outlet 53 is in a closed state, the pointed part of the second blocking block 532 just fits with the funnel-shaped part of the right portion, thereby enhancing its sealing performance; at the same time, a needle end is also provided at the outlet end of the liquid outlet 53, and the inner diameter of the needle end gradually decreases from the end close to the liquid outlet 53 to the end away from the liquid outlet 53.

[0042] In some embodiments, a telescopic part 8 is installed on the needle end side of the main body 51 through a fourth spring. At the same time, a sensing switch 9 corresponding to the telescopic part 8 is arranged on the main body 51. The sensing switch 9 is fixed to the bottom of the main body 51 by bolts. At the same time, in order to protect the telescopic part 8 and limit the telescopic part 8, an outer cover is connected to the outside of the telescopic part 8 by a snap-on. When not injecting, the telescopic part 8 is outside the sensing range of the sensing switch 9 under the action of the fourth spring. During injection, the telescopic part 8 is brought into contact with the animal skin to compress the fourth spring, and the telescopic part 8 approaches the sensing switch 9 and reaches within the sensing range of the sensing switch 9. The sensing switch 9 controls the dispensing mechanism 5 to perform injection.

[0043] In some embodiments, a first one-way valve is disposed in the liquid inlet 52, such as Figure 5 The first one-way valve includes a first blocking block 522 and a first spring 521 that drives the first blocking block 522 to reciprocate in the liquid inlet 52. The first blocking block 522 includes a first blocking section and a first connecting section. The side of the first blocking section close to the infusion catheter 4 is sloped. When the injection device is inhaling medicine, the first blocking block 522 is subjected to a first force and deviates in a first direction under the action of the first force. At this time, an annular gap is formed between the outer wall of the first blocking section and the liquid outlet end of the infusion catheter 4, so that the drug liquid can enter the liquid inlet 52 from the infusion catheter 4 and then flow into the inside of the main body 51; when the injection device is injecting, the first blocking block 522 is subjected to a second force applied by the drug liquid, and the first blocking section moves in the second direction and is close to the liquid outlet end of the infusion catheter 4, thereby limiting the drug liquid from flowing back into the infusion catheter 4; a second one-way valve is provided in the liquid outlet 53. Specifically, the second one-way valve includes a second blocking block 532 and a first connecting section that drives the second blocking block 532 to move in the outlet The second spring 531 reciprocates in the liquid port 53, and the second blocking block 532 includes a second blocking section and a second connecting section. The side of the second blocking section close to the main body 51 (i.e., the pointed part) is sloped. When the injection device is sucking medicine, the second blocking section is subjected to a third force, and under the action of the third force, it moves along the third direction and is close to the liquid outlet end of the main body 51, thereby limiting the outflow of the drug from the liquid outlet 53; when the injection device is injecting, the second blocking block 532 is subjected to a fourth force exerted by the drug, and under the action of the fourth force, it deviates along the fourth direction. At this time, an annular gap is formed between the outer wall of the second blocking section and the liquid outlet end of the main body 51, so that the drug can enter the liquid outlet 53 from the main body 51, and then be sprayed out from the injection device to complete the injection, wherein the first direction is the direction from the liquid inlet end to the liquid outlet end of the liquid inlet 52, and the second direction is opposite to the first direction; the fourth direction is the direction from the liquid inlet end to the liquid outlet end of the liquid outlet 53, and the third direction is opposite to the fourth direction.

[0044] The sloped shape of the plugging section means that its size gradually increases from the liquid inlet end to the liquid outlet end (i.e., the end connected to the connecting section).

[0045] In some embodiments, the first blocking block 522 and the second blocking block 532 have the same shape and size, and the cross-sectional angle of the pointed portion thereof is 90-135°.

[0046] In some embodiments, four limiting protrusions 11 can be respectively provided on the side walls of the first blocking section and the second blocking section, and the limiting protrusions 11 are evenly distributed on the first blocking section and the second blocking section, and drainage channels are formed between adjacent limiting protrusions 11, with a total of 4 drainage channels. When the liquid inlet 52 is opened, the bottom of the limiting protrusion 11 on the first blocking section is located on the first step, and the first blocking block 522 can be limited by the first step to prevent the first blocking block 522 from blocking the lower part and thus preventing the liquid from entering. At the same time, during the liquid intake process, the medicinal liquid flows to the drainage channel through the sloped first blocking section, and then flows to the inside of the main body 51 through the lower part, which can make the medicinal liquid more uniform during the flow process, thereby balancing the pressure generated by the medicinal liquid on the first blocking block 522; and similarly, when the liquid outlet 53 is in the open state, the bottom of the limiting protrusion 11 on the second blocking section is located on the second step, and the second blocking block 532 can be limited by the second step to prevent the second blocking block 532 from blocking the left part and preventing the liquid from discharging.

[0047] This solution provides a limited drainage solution by adopting a metal sealing section design with multiple convex positions in conjunction with a spring and a stepped inner tube (such as a liquid inlet and a liquid outlet). This limited drainage solution can not only guide the drug solution through the drainage channel to complete rapid drug absorption or injection under the action of corresponding suction or thrust, but also avoid problems such as blockage and leakage that are prone to occur in traditional valves.

[0048] To further ensure the sealing of the first one-way valve, a rubber gasket is provided at the end where the liquid inlet 52 is connected to the infusion tube 4. A through hole is opened in the rubber gasket and the corresponding part of the infusion tube 4, and the pointed part of the first blocking block 522 is located in the through hole.

[0049] In some embodiments, at least the blocking sections of the first blocking block 522 and the second blocking block 532 in this solution are made of metal material with a tensile strength of more than 300 MPa. However, under the impact of high-pressure drug flow during needle-free injection, the metal blocking blocks are very easy to wear, and the rubber gasket can effectively protect them.

[0050] The piston 10 is movably arranged inside the main body 51, and a mounting groove is arranged on the side wall of the piston 10. Two retaining rings can be symmetrically arranged inside the mounting groove, and an O-ring is arranged between the two retaining rings. The outer diameter of the O-ring can be larger than the outer diameter of the retaining ring. During the needle-free injection process, the injection pressure is usually 60-70MPa, so in this solution, two retaining rings are arranged to protect the O-ring, thereby avoiding leakage caused by damage to the O-ring, and a piston rod is fixedly arranged on one side of the piston 10 connected to the motor 6.

[0051] In order to further ensure the installation stability of each component and achieve the anti-vibration effect, a first fixing seat 13, a connecting member 14 and a second fixing seat 15 which are fixedly connected in sequence are arranged between the main body 51 and the motor 6. Specifically, the first fixing seat 13, the connecting member 14 and the second fixing seat 15 can be integrally formed.

[0052] Among them, the connecting member 14 is a cylindrical connecting member 14 with a hollow interior, the free end of the piston rod passes through the internal cavity of the connecting member 14 and is connected to the output shaft of the motor 6, and the length of the connecting member 14 is 50-60mm, its outer diameter is 35-40mm, and its inner diameter is 4-7mm. The second fixing seat 15 is fixed to the shell, the outer shell of the motor 6 and the connecting member 14 respectively.

[0053] like Figure 6 , Figure 7 To facilitate installation and disassembly, the present solution is provided with a one-button disassembly structure for convenient disassembly, including a first fixing seat 13 and a mounting block 12 integrally arranged on the main body 51. Specifically, the first fixing seat 13 includes a connecting portion 133, a mounting portion 134 and an elastic member for locking the mounting block 12. The connecting portion 133 is provided with an opening matching the mounting block 12, and a cavity is reserved between the connecting portion 133 and the mounting portion 134 for the mounting block 12 to rotate. A groove is provided on the mounting portion 134, and one end of the elastic member is fixedly arranged in the groove. The mounting block 12 is provided with a through hole matching the elastic member.

[0054] In some embodiments, two groups of elastic members and through holes are correspondingly arranged and are symmetrically arranged at 180°. The specific elastic members include a third spring 131 and a movable block 132. One end of the third spring 131 is fixedly arranged inside the groove, and the other end is fixedly connected to the movable block 132. When the elastic member is not subject to external force, a part of the movable block 132 is located outside the groove; when the mounting block 12 enters the opening from a first angle, the elastic member is staggered from the through hole. At this time, the elastic member is not subject to external force and is in a natural state; when the mounting block 12 is rotated, the elastic member is compressed by the pressure of the mounting block 12; when the mounting block 12 is rotated 90° clockwise or counterclockwise to reach the second angle, the groove is aligned with the through hole, and the pressure of the mounting block 12 on the elastic member is reduced, and the elastic member is elongated, so that a part of the movable block 132 is located in the through hole, and the mounting block 12 is locked, thereby achieving the purpose of self-locking.

[0055] In order to further ensure the stability of the dispensing mechanism 5, a fixing rod is also provided, and corresponding through holes are respectively provided on the main body 51 and the first fixing seat 13. After the main body 51 is fixed to the first fixing seat 13 through the mounting block 12, the fixing rod is passed through the through holes on the main body 51 and the first fixing seat 13 in turn, thereby achieving fixation of the main body 51 and the first fixing seat 13.

[0056] In some embodiments, a transition zone is provided at the second end of the main body 51, and correspondingly, a docking position corresponding to the transition zone is provided at the first end of the connecting piece 14. When the main body 51 is fixedly connected to the connecting piece 14, the transition zone is snapped into the docking position; wherein, the inner diameter of the transition zone gradually increases from its first end to the second end, and the inner diameter of the transition zone is larger than the inner diameter of the main body 51 part of the connecting piece 14, so as to ensure that the piston 10 enters the main body 51 more smoothly; the inner wall of the cavity at the first end of the main body 51 is set to be pointed, and the inner diameter of the pointed part gradually decreases from the second end to the first end of the main body 51, so that the medicine has a sufficiently large hydraulic pressure when flowing out of the main body 51, and this part matches the shape of the pointed part of the piston 10, so that when the piston 10 reaches the first end of the main body 51, the medicine inside the main body 51 can be completely discharged.

[0057] During specific use, first insert the mounting block 12 into the opening of the connecting portion 133. At this time, the third spring 131 is in a compressed state under the action of the mounting block 12, and the entire movable block 132 is located inside the groove. Then rotate the dispensing mechanism 5 to make the mounting block 12 rotate in the cavity until the through hole on the mounting block 12 is aligned with the movable block 132. At this time, the force of the mounting block 12 on the third spring 131 disappears, and the third spring 131 is extended, so that a part of the movable block 132 enters the through hole and clamps the mounting block 12, thereby achieving the installation and fixation of the dispensing mechanism 5; when disassembling, rotate the dispensing mechanism 5 in the opposite direction to make the movable block 132 disengage from the through hole, and the mounting block 12 can be aligned with the opening of the connecting portion 133 again and can be taken out. Compared with the disassembly method of removing bolts in the prior art, this disassembly method only needs to rotate the dispensing mechanism 5 by a fixed angle, without the need to screw the bolts one by one and remove them, which is more convenient and quick.

[0058] On the one hand, this solution uses a rotating disassembly scheme of the mounting block and the first fixed seat to facilitate the user to easily complete the disassembly of the three-way joint during use; at the same time, through the coordination of the mounting block, the first fixed seat and the indirect connection of the connecting piece with the motor, a vibration-resistant detachable solution is formed.

[0059] It is worth noting that the detachable syringe-related structure mentioned in this solution is not only applicable to needle-free syringes, but also to syringes with needles.

[0060] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0061] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all fall within the protection of the utility model.

Claims

1. A detachable syringe, comprising a housing, a dispensing mechanism (5), an infusion catheter (4) and a motor (6), wherein the dispensing mechanism (5) is arranged inside the housing, the motor (6) is fixed inside the housing, the infusion catheter (4) is connected to the dispensing mechanism (5) to provide liquid medicine to the dispensing mechanism (5), characterized in that: A first fixing seat (13) is fixedly arranged at one end of the output shaft of the motor (6); a mounting block (12) is arranged at one end of the dispensing mechanism (5) close to the first fixing seat (13); the first fixing seat (13) comprises a connecting portion (133), a mounting portion (134) and an elastic member for locking the mounting block (12); the connecting portion (133) is provided with an opening matching the mounting block (12); a cavity for the mounting block (12) to rotate is reserved between the connecting portion (133) and the mounting portion (134); a groove is arranged on the mounting portion (134); one end of the elastic member is fixedly arranged in the groove; and the mounting block (12) is provided with a mounting hole matching the elastic member; When the mounting block (12) enters the opening from a first angle, the elastic member is offset from the mounting hole, and the elastic member is in an initial state at this time, with the free end of the elastic member extending out of the groove; when the mounting block (12) is rotated, the elastic member is compressed by the pressure of the mounting block (12), and when the mounting block (12) is rotated to a second angle, the groove is aligned with the mounting hole, and the pressure of the mounting block (12) on the elastic member is reduced, thereby causing the free end of the elastic member to extend into the mounting hole to connect the mounting block (12) and the first fixing seat (13).

2. A detachable syringe according to claim 1, characterized in that: The elastic member comprises a third spring (131) and a movable block (132); one end of the third spring (131) is fixedly arranged inside the groove, and the other end is fixedly connected to the movable block (132); when the elastic member is not subjected to external force, a portion of the movable block (132) is located outside the groove.

3. A detachable syringe according to claim 1, characterized in that: A connecting piece (14) is also provided between the first fixing seat (13) and the motor (6); the connecting piece (14) is an internally hollow connecting piece (14); one end of the connecting piece (14) is fixedly connected to the motor (6), and the other end is fixedly connected to the first fixing seat (13).

4. A detachable syringe according to claim 3, characterized in that: A second fixing seat (15) is also provided between the connecting member (14) and the motor (6), and the second fixing seat (15) is respectively fixed to the housing, the motor (6) and the connecting member (14).

5. A detachable syringe according to claim 3, characterized in that: The dispensing mechanism (5) comprises a main body (51) for containing liquid, and a liquid inlet (52) and a liquid outlet (53) fixedly arranged on the main body (51) and connected to the main body (51); a first one-way valve is arranged in the liquid inlet (52), and a second one-way valve is arranged in the liquid outlet (53); a piston (10) is movably arranged inside the main body (51); a piston rod is fixedly arranged on one side of the piston (10) connected to the motor (6); and the free end of the piston rod passes through the interior of the connecting member (14) and is fixedly connected to the output shaft of the motor (6).

6. A detachable syringe according to claim 5, characterized in that: It also comprises a fixing rod, which passes through the main body (51) and the first fixing seat (13) in sequence and is used to fix the main body (51) and the first fixing seat (13).

7. A detachable syringe according to claim 5, characterized in that: The liquid inlet (52) is composed of an upper part and a lower part from the liquid inlet end to the liquid outlet end, the diameter of the upper part is greater than the diameter of the lower part, and a first step is formed at the connection between the upper part and the lower part; the liquid outlet (53) is composed of a right part and a left part from the liquid inlet end to the liquid outlet end, the diameter of the right part is greater than the diameter of the left part, and a second step is formed at the connection between the right part and the left part.

8. A detachable syringe according to claim 5, characterized in that: The first one-way valve comprises a first spring (521) and a first blocking block (522), wherein the first spring is sleeved on the first blocking block, and the cross-sectional shape of the first blocking block (522) is an arrow-shaped shape facing the infusion catheter (4); the second one-way valve comprises a second spring (531) and a second blocking block (532), wherein the second spring is sleeved on the second blocking block, and the cross-sectional shape of the second blocking block (532) is an arrow-shaped shape facing the main body (51); the end where the liquid outlet (53) is connected to the main body (51) gradually becomes smaller and is funnel-shaped, and the inclination angle is the same as or similar to the inclination angle of the pointed part of the second blocking block (532); the end where the liquid inlet (52) is connected to the infusion catheter (4) is provided with a rubber gasket, and the rubber gasket and the corresponding part of the infusion catheter (4) are provided with a through hole, and when the syringe is in the injection state, the pointed part of the first blocking block (522) is located in the through hole.

9. A detachable syringe according to claim 5, characterized in that: A mounting groove is provided on the side wall of the piston (10), two retaining rings are provided in the mounting groove, and an O-shaped sealing ring is provided between the two retaining rings.

10. A detachable syringe according to claim 5, characterized in that: The second end of the main body (51) is provided with a transition zone, and correspondingly, the first end of the connecting piece (14) is provided with a docking position corresponding to the transition zone. When the main body (51) is fixedly connected to the connecting piece (14), the transition zone is snapped into the docking position; wherein the inner diameter of the transition zone gradually increases along the direction from the first end to the second end thereof, and the inner diameter of the transition zone is greater than the inner diameter of the cavity of the connecting piece (14); the inner wall of the cavity at the first end of the main body (51) is configured to be pointed, and the inner diameter of the pointed portion of the main body (51) gradually decreases along the direction from the second end to the first end of the main body (51).

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