Syringe

Abstract

The utility model belongs to the technical field of medical instruments, and particularly provides an injector which comprises a shell assembly, a memory mechanism and an injection mechanism, the memory mechanism comprises a memory sleeve and a memory ring, the memory ring is arranged on the memory sleeve in a threaded and sleeving mode, and when the memory ring abuts against a stop structure of the memory sleeve, the memory sleeve is sleeved with the memory ring. The memory ring is limited to rotate in the first hour hand direction relative to the memory sleeve; the injection mechanism comprises a push rod and a one-way limiting assembly; when a medicine bottle is contained in the containing space of the shell assembly, the push rod is limited to rotate in the first hour hand direction relative to the shell assembly. When the medicine bottle is not contained in the containing space, the push rod can rotate in the first hour hand direction relative to the shell assembly, then the memory sleeve is linked to rotate in the first hour hand direction relative to the memory ring, and the push rod and the memory ring are reset at the same time. The syringe provided by the embodiment of the utility model not only has a reusable function, but also can ensure that the dosage set at the last time is equal to the dosage actually injected at the last time.

Description

Technical Field

[0001] The present application belongs to the technical field of medical devices, and specifically relates to a syringe. Background Art

[0002] Syringes used for insulin injection on the market are generally divided into disposable syringes and reusable syringes. Disposable syringes need to be discarded after the pre-installed medicine inside is injected, while reusable syringes have a medicine chamber for accommodating medicine bottles. Users can freely set the dosage of the medicine for each injection, inject the medicine in the medicine bottle in multiple times, and then take the empty medicine bottle out of the medicine chamber and put a new medicine bottle into the medicine chamber, so as to achieve the reusable function. However, when using a reusable syringe, the user cannot clearly know the specific amount of medicine remaining in the medicine bottle, which leads to the situation that the dosage set by the user is higher than the actual dosage remaining in the medicine bottle when the last drug injection is performed, thereby causing the safety risk of insufficient injection dosage. Utility Model Content

[0003] The purpose of the present application is to provide a syringe, aiming to solve the technical problem that the set dose of the reusable syringe in the prior art is easily higher than the actual injection dose when the last drug injection is performed.

[0004] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: a syringe, comprising a shell assembly, a memory mechanism and an injection mechanism, the shell assembly is provided with a accommodating space for accommodating a medicine bottle; the memory mechanism comprises a memory sleeve and a memory ring, one end of the memory sleeve is provided with a stop structure, and the memory ring is threadedly sleeved on the memory sleeve; during the dose setting process, the memory ring rotates relative to the memory sleeve, and when the memory ring abuts against the stop structure, the memory ring is restricted from rotating relative to the memory sleeve in a first clockwise direction; during the injection process, the memory sleeve and the memory ring synchronously rotate relative to the shell assembly in a direction opposite to the first clockwise direction; the injection mechanism comprises a push rod and a one-way limit assembly connected to the push rod, and the push rod The push rod rotates synchronously with the memory sleeve and can move axially when the shell assembly rotates relative to the push rod, and the distal end of the push rod is used to extend into the medicine bottle accommodated in the accommodating space to perform push injection; when the memory ring abuts against the stop structure, when the injection is completed, the distal end of the push rod reaches the preset end point; when the medicine bottle is placed in the accommodating space, the one-way limit assembly is in a connected state, and the push rod is restricted from rotating in a first clockwise direction relative to the shell assembly; when the medicine bottle is not placed in the accommodating space, the one-way limit assembly is in a disengaged state, and the push rod can rotate in the first clockwise direction relative to the shell assembly, thereby linking the memory sleeve to rotate in the first clockwise direction relative to the memory ring, thereby resetting the push rod and the memory ring at the same time.

[0005] Furthermore, the syringe further comprises a push rod sleeve, a dose setting assembly and a rotary clutch assembly, the push rod sleeve is sleeved on the push rod, the memory sleeve is sleeved on the push rod sleeve, the push rod, the push rod sleeve and the memory sleeve rotate synchronously, and the push rod and the memory sleeve can both move axially relative to the push rod sleeve; the dose setting assembly is threadedly connected to the housing assembly, the dose setting assembly moves axially by rotating relative to the housing assembly, the dose setting assembly rotates synchronously with the memory ring, the memory ring can move axially relative to the dose setting assembly, and the dose setting assembly is connected to the memory sleeve via the rotary clutch assembly;

[0006] During the dose setting process, the rotating clutch assembly enables the dose setting assembly and the memory sleeve to synchronously move axially relative to the housing assembly, and enables the dose setting assembly to rotate relative to the memory sleeve, thereby linking the memory ring to move axially relative to the memory sleeve; during the injection process, the rotating clutch assembly enables the dose setting assembly and the memory sleeve to synchronously move axially and in a first straight line direction relative to the housing assembly, and synchronously rotate relative to the housing assembly in a direction opposite to the first clockwise direction, thereby linking the memory ring to rotate relative to the housing assembly in a direction opposite to the first clockwise direction, and the memory ring is stationary relative to the memory sleeve in the axial direction; during the process of the push rod rotating relative to the housing assembly in the first clockwise direction for resetting, the push rod drives the memory sleeve to rotate relative to the housing assembly in the first clockwise direction through the push rod sleeve, and the rotating clutch assembly enables the memory sleeve to rotate relative to the dose setting assembly in the first clockwise direction, thereby linking the memory ring to move relative to the memory sleeve in the first straight line direction and in a direction away from the stop structure for resetting.

[0007] Further, a first annular protrusion surrounding the push rod sleeve is provided at the distal end of the dose setting assembly, a second annular protrusion is provided at the proximal end of the dose setting assembly, a positive adjustment tooth is provided on the proximal end surface of the first annular protrusion, and a negative adjustment tooth is provided on the distal end surface of the memory sleeve;

[0008] The rotary clutch assembly includes a clutch gear, a first spring and a pressing piece. The clutch gear is sleeved on the push rod sleeve. The two ends of the clutch gear are respectively matched with the positive adjustment tooth and the negative adjustment tooth. The distal end of the pressing piece is inserted into the dose setting assembly and abuts against the proximal end surface of the memory sleeve. The portion of the pressing piece inserted into the dose setting assembly has a first fixed surface. The two ends of the first spring are respectively abutted against the first fixed surface and the second annular protrusion.

[0009] During the dose setting process, when the dose setting assembly rotates in the first clockwise direction relative to the housing assembly, the clutch gear jumps axially relative to the positive adjustment tooth under the action of the first spring, thereby causing the dose setting assembly to rotate relative to the memory sleeve; when the dose setting assembly rotates in the opposite direction of the first clockwise direction relative to the housing assembly, the clutch gear rotates synchronously with the positive adjustment tooth, and the memory sleeve jumps axially relative to the clutch gear under the action of the first spring, thereby causing the dose setting assembly to rotate relative to the memory sleeve; during the injection process, the pressing member pushes the memory sleeve, so that the negative adjustment tooth engages with the clutch gear, and the clutch gear engages with the positive adjustment tooth, thereby causing the memory sleeve, the clutch gear and the dose setting assembly to rotate synchronously; during the process of the push rod rotating in the first clockwise direction for resetting, the push rod drives the memory sleeve to rotate synchronously through the push rod sleeve, and the memory sleeve jumps axially relative to the clutch gear under the action of the first spring, thereby causing the memory sleeve to rotate relative to the dose setting assembly.

[0010] Furthermore, the dose setting assembly includes a fixedly connected measuring cylinder and a matching sleeve, a scale is provided on the outer side of the measuring cylinder, the measuring cylinder is located at the outer periphery of the matching sleeve, a matching gap is formed between the measuring cylinder and the matching sleeve, the shell assembly is partially inserted into the matching gap and is threadedly connected to the outer side of the matching sleeve, the memory ring is installed inside the matching sleeve and rotates synchronously with the matching sleeve, and the memory ring can move axially relative to the matching sleeve.

[0011] Furthermore, the one-way limiting assembly includes a limiting ring and a driving sleeve sleeved on the outer circumference of the push rod, the limiting ring and the push rod rotate synchronously, and the push rod can move axially relative to the limiting ring; the driving sleeve is threadedly connected to the push rod, and the distal end of the driving sleeve is used to abut against the proximal end of the medicine bottle accommodated in the accommodating space, and the driving sleeve is allowed to move axially relative to the shell assembly, but is restricted from rotating relative to the shell assembly;

[0012] In the connected state, the limit ring is connected to the proximal end of the drive sleeve, and the limit ring is restricted from rotating in a first clockwise direction relative to the drive sleeve; in the disengaged state, the limit ring is separated from the proximal end of the drive sleeve, and the limit ring can rotate in the first clockwise direction relative to the drive sleeve.

[0013] Furthermore, the shell assembly has a second fixed surface, which is arranged facing the proximal end surface of the drive sleeve; the syringe also includes a second spring, and the two ends of the second spring are respectively connected to the second fixed surface and the proximal end surface of the drive sleeve; when the medicine bottle is placed in the accommodating space, the second spring is in a compressed state; when the medicine bottle placed in the accommodating space is taken out, the second spring stretches to push the drive sleeve to move in a direction away from the second fixed surface, thereby separating the drive sleeve from the limit ring.

[0014] Furthermore, a first one-way tooth is arranged on the distal end face of the limiting ring, and a second one-way tooth is arranged on the proximal end face of the driving sleeve; when a medicine bottle is placed in the accommodating space, the first one-way tooth is meshed with the second one-way tooth to limit the limiting ring from rotating in a first clockwise direction relative to the driving sleeve; when no medicine bottle is placed in the accommodating space, the driving sleeve can move in a direction away from the limiting ring so that the first one-way tooth is separated from the second one-way tooth, so that the limiting ring can rotate in the first clockwise direction relative to the driving sleeve.

[0015] Furthermore, the shell assembly has a third fixed surface, and the third fixed surface is arranged facing the proximal end surface of the limiting ring; the syringe also includes a third spring, and the two ends of the third spring are respectively connected to the third fixed surface and the proximal end surface of the limiting ring; when the first one-way tooth cooperates with the second one-way tooth, and the limiting ring rotates in the opposite direction of the first clockwise direction relative to the shell assembly, the limiting ring jumps axially relative to the driving sleeve under the action of the third spring, thereby causing the limiting ring to rotate relative to the driving sleeve.

[0016] Further, the inner wall of the housing assembly is provided with a first sliding protrusion, the outer wall of the driving sleeve is provided with a first sliding groove, the first sliding groove is extended along the axial direction of the driving sleeve, and the first sliding protrusion is slidably connected to the first sliding groove;

[0017] Alternatively, a first slide groove is provided on the inner wall of the shell assembly, and the first slide groove is extended along the axial direction of the driving sleeve. A first sliding protrusion is provided on the outer wall of the driving sleeve, and the first sliding protrusion is slidably connected to the first slide groove.

[0018] Furthermore, the shell assembly includes a main shell and a medicine chamber. The drive sleeve is located inside the main shell and at the distal end of the main shell. The medicine chamber is detachably connected to the distal end of the main shell. A accommodating space is formed inside the medicine chamber, and the accommodating space is connected to the internal space of the main shell.

[0019] Compared with the prior art, the beneficial effect of the syringe provided by the present application is that: during the dose setting and injection process, the one-way limit assembly of the injection mechanism is in a connected state, and the push rod is restricted to rotate in the first clockwise direction relative to the housing assembly, thereby preventing the push rod from accidentally retreating. Each time a dose setting is completed, the memory ring will move a distance relative to the memory sleeve in the direction close to the stop structure, and each time an injection is completed, the distal end of the push rod will move a distance toward the preset end point, until the last dose setting, the memory ring abuts against the stop structure, and the memory ring is restricted to rotate in the first clockwise direction relative to the memory sleeve. At this time, the set dose cannot be further increased, reminding the user that the current remaining dose of the medicine in the medicine bottle is the currently set dose. When the injection is completed, the distal end of the push rod just reaches the preset end point, and all the medicine in the medicine bottle is pushed out, so that the dose set by the user can be prevented from being higher than the remaining dose in the medicine bottle, and the last set dose is ensured to be equal to the last actual injection dose. After the last injection is completed, the empty medicine bottle in the accommodating space is taken out, and the one-way limit assembly is switched from the connected state to the disengaged state. At this time, the push rod can be rotated in the first clockwise direction to make the push rod retreat for resetting. During this process, the push rod will link the memory sleeve to rotate in the first clockwise direction relative to the memory ring, so that the memory ring moves in the direction away from the stop structure for resetting, that is, the push rod and the memory ring can be reset at the same time. After the resetting is completed, a new medicine bottle is loaded into the accommodating space, so that the one-way limit assembly is restored to the connected state, and then the syringe can be reused to realize the reusable function of the syringe. The syringe provided in this embodiment not only has the function of being reusable, but also can ensure that the last set dose is equal to the last actual injection dose, which effectively solves the problem that the reusable syringe in the prior art is prone to the situation where the set dose is higher than the actual injection dose when performing the last drug injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the structure of a syringe provided in an embodiment of the present application;

[0022] Figure 2 A cross-sectional view of a syringe provided in an embodiment of the present application in an initial state;

[0023] Figure 3 for Figure 2 An enlarged view of the syringe shown at A;

[0024] Figure 4 for Figure 2 An enlarged view of the syringe shown at B;

[0025] Figure 5 A schematic diagram of the structure of the syringe provided in an embodiment of the present application in a dose setting state;

[0026] Figure 6 A cross-sectional view of the syringe provided in an embodiment of the present application after the last dose setting is completed;

[0027] Figure 7 for Figure 6 An enlarged view of the syringe shown at C;

[0028] Figure 8 A cross-sectional view of the syringe provided in an embodiment of the present application after the last drug injection is completed;

[0029] Fig. 9 A cross-sectional view of the syringe provided in the embodiment of the present application after the medicine bottle and the medicine chamber are removed and before the syringe is reset;

[0030] Fig.10 for Fig. 9 An enlarged view of the syringe at position D;

[0031] Fig.11 Partial structural decomposition of the syringe provided in the embodiment of the present application Figure 1 ;

[0032] Fig.12 for Fig.11 A schematic diagram of the structure of the jacket shown;

[0033] Fig.13 Partial structural decomposition of the syringe provided in the embodiment of the present application Figure 2 ;

[0034] Fig.14 for Fig.13 The structural schematic diagram of the rotating drum support shown;

[0035] Fig.15 for Fig.13 A schematic diagram of the structure of the fixed sleeve shown;

[0036] Fig.16 for Fig.13 The structure shown is a schematic diagram of the structure after the drum support and the fixed sleeve are removed;

[0037] Fig.17 for Fig.16 The structure of the fixed ring is shown Figure 1 ;

[0038] Fig.18for Fig.16 The structure of the fixed ring is shown Figure 2 ;

[0039] Fig.19 for Fig.16 A schematic diagram of the structure of the drive sleeve shown;

[0040] Fig. 20 for Fig.16 The structural schematic diagram of the limiting ring shown;

[0041] Fig.21 for Fig.16 An exploded view of the push rod and push rod sleeve shown;

[0042] Fig. 22 Partial structural decomposition of the syringe provided in the embodiment of the present application Figure 3 ;

[0043] Fig.23 for Fig. 22 The schematic diagram of the structure of the memory mechanism shown;

[0044] Fig.24 for Fig.23 A schematic diagram of the structure of the memory ring of the memory mechanism shown;

[0045] Fig.25 for Fig. 22 The structure of the matching sleeve shown Figure 1 ;

[0046] Fig.26 for Fig. 22 The structure of the matching sleeve shown Figure 2 ;

[0047] Fig. 27 for Fig. 22 A cross-sectional view showing the mating sleeve, the measuring cylinder and the pressing member mating with each other;

[0048] Fig.28 for Fig. 22 The schematic diagram of the structure of the measuring cylinder shown;

[0049] Fig.29 for Fig. 27 A schematic structural diagram of a connecting sleeve of a pressing member shown;

[0050] Fig.30 for Fig. 27 A schematic structural diagram of the tail handle of the pressing piece is shown.

[0051] Among them, the reference numerals in the figure are:

[0052] 100. Syringe;

[0053] 10. Shell assembly; 11. Main shell; 111. Outer shell; 1111. Positioning groove; 1112. Window; 112. Drum bracket; 1121. First internal thread; 1122. First fixing hole; 1123. Second fixing hole; 113. Fixing sleeve; 1131. First buckle; 1132. Second buckle; 1133. Second external thread; 1134. First sliding protrusion; 114. Fixing ring; 1141. Second fixing surface; 1142. Third fixing surface; 1143. Positioning groove; 1144. Third buckle; 12. Medicine chamber; 121. Accommodating space; 122. Second internal thread; 123. Fifth external thread;

[0054] 20. Memory mechanism; 21. Memory sleeve; 211. Stop structure; 212. Third external thread; 213. Second sliding protrusion; 214. Anti-adjustment tooth; 22. Memory ring; 221. Third internal thread; 222. Third sliding protrusion; 223. Ring body; 224. Abutment protrusion;

[0055] 30. injection mechanism; 31. push rod; 311. fourth external thread; 312. fourth slide groove; 32. one-way limiting assembly; 321. limiting ring; 3211. fifth sliding protrusion; 3212. first one-way tooth; 322. driving sleeve; 3221. fourth internal thread; 3222. first slide groove; 3223. second one-way tooth; 3224. sleeve body; 3225. annular boss;

[0056] 40. Second spring;

[0057] 50. Third spring;

[0058] 60. push rod sleeve; 61. fourth sliding protrusion; 62. second sliding groove;

[0059] 70. dose setting assembly; 71. matching sleeve; 711. third slide groove; 712. first external thread; 713. connecting boss; 714. first annular protrusion; 715. positive adjustment tooth; 716. claw; 72. measuring cylinder; 721. connecting hole; 722. second annular protrusion; 723. limiting boss; 724. through hole; 725. pattern; 726. scale; 73. matching clearance;

[0060] 80, rotary clutch assembly; 81, clutch gear; 82, first spring; 83, pressing member; 831, connecting sleeve; 8311, first fixing surface; 8312, first connecting section; 8313, second connecting section; 8314, fixing protrusion; 832, tail handle; 8321, pressing plate; 8322, connecting column; 8323, fixing groove;

[0061] 90. Piston;

[0062] 200. Medicine bottle. DETAILED DESCRIPTION

[0063] The embodiments of the present application 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 present application, and should not be construed as limiting the present application.

[0064] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to 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 application.

[0065] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0066] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0067] Please also read Figures 1 to 10The embodiment of the present application provides a syringe 100, including a housing assembly 10, a memory mechanism 20 and an injection mechanism 30. The housing assembly 10 is provided with a storage space 121 for accommodating a medicine bottle 200; the memory mechanism 20 includes a memory sleeve 21 and a memory ring 22, one end of the memory sleeve 21 is provided with a stop structure 211, and the memory ring 22 is threadedly sleeved on the memory sleeve 21; during the dose setting process, the memory ring 22 rotates relative to the memory sleeve 21, and when the memory ring 22 abuts against the stop structure 211, the memory ring 22 is restricted from rotating relative to the memory sleeve 21 in a first clockwise direction; during the injection process, the memory sleeve 21 and the memory ring 22 synchronously rotate relative to the housing assembly 10 in a direction opposite to the first clockwise direction; the injection mechanism 30 includes a push rod 31 and a stop structure 211 that is screwed to the memory sleeve 21; The one-way limit assembly 32 is connected to the push rod 31, and the push rod 31 rotates synchronously with the memory sleeve 21. The push rod 31 can move axially when rotating relative to the shell assembly 10, and the distal end of the push rod 31 is used to extend into the medicine bottle 200 accommodated in the accommodating space 121 to perform push injection; when the medicine bottle 200 is accommodated in the accommodating space 121, the one-way limit assembly 32 is in a connected state, and the push rod 31 is restricted from rotating in a first clockwise direction relative to the shell assembly 10; when the medicine bottle 200 is not accommodated in the accommodating space 121, the one-way limit assembly 32 is in a disengaged state, and the push rod 31 can rotate in the first clockwise direction relative to the shell assembly 10, thereby linking the memory sleeve head 21 to rotate in the first clockwise direction relative to the memory ring 22, so that the push rod 31 and the memory ring 22 are reset at the same time.

[0068] During the dose setting process, when the set dose is increased, the memory ring 22 rotates relative to the memory sleeve 21 in the first clockwise direction and moves toward the direction close to the stop structure 211. When the set dose is reduced, the memory ring 22 rotates relative to the memory sleeve 21 in the opposite direction of the first clockwise direction and moves away from the stop structure 211. During the injection process, the memory sleeve 21, the memory ring 22 and the push rod 31 rotate synchronously in the opposite direction of the first clockwise direction, and the push rod 31 moves axially in the direction of the preset end point to perform push injection. During this process, the relative position of the memory ring 22 and the memory sleeve 21 will not change. During the dose setting and injection process, the one-way limit assembly 32 of the injection mechanism 30 is in a connected state, and the push rod 31 is restricted from rotating in the first clockwise direction, thereby preventing the push rod 31 from retreating. Each time a dose is set, the memory ring 22 moves a distance toward the direction close to the stop structure 211. Each time an injection is completed, the distal end of the push rod 31 moves a distance toward the preset end point. Until the last dose is set, the memory ring 22 abuts against the stop structure 211. The memory ring 22 is restricted from rotating in the first clockwise direction relative to the memory sleeve 21. At this time, the set dose cannot be further increased, reminding the user that the remaining dose of the drug in the current medicine bottle 200 is the currently set dose. When the injection is completed, the distal end of the push rod 31 just reaches the preset end point, and all the drugs in the medicine bottle 200 are pushed out. This can prevent the dose set by the user from being higher than the remaining dose in the medicine bottle 200, and ensure that the last set dose is equal to the last actual injection dose. After completing the last injection, the empty medicine bottle 200 in the accommodating space 121 is taken out, and the one-way limit assembly 32 is switched from the connected state to the disengaged state. At this time, the push rod 31 can be rotated in the first clockwise direction to make the push rod 31 retreat for resetting. During this process, the push rod 31 will link the memory sleeve 21 to rotate in the first clockwise direction relative to the memory ring 22, so that the memory ring 22 moves in the direction away from the stop structure 211 for resetting, that is, the push rod 31 and the memory ring 22 can be reset at the same time. After the resetting is completed, a new medicine bottle 200 is loaded into the accommodating space 121, so that the one-way limit assembly 32 is restored to the connected state, and then the syringe 100 can be reused to realize the reusable function of the syringe 100.

[0069] The syringe 100 provided in this embodiment not only has the function of being reusable, but also can ensure that the last set dose is equal to the last actual injected dose, which effectively solves the problem in the prior art that the reusable syringe 100 is prone to having the set dose higher than the actual injected dose when performing the last drug injection.

[0070] It should be noted that the push rod 31 of the syringe 100 provided in this embodiment is threadedly connected to other components, which enables the push rod 31 to move axially while rotating relative to the housing assembly 10. In this embodiment, when the push rod 31 rotates in the opposite direction of the first clockwise direction relative to the housing assembly 10, the push rod 31 moves in a direction close to the preset end point to push out the medicine in the medicine bottle 200, thereby achieving push injection, and when the push rod 31 rotates in the first clockwise direction relative to the housing assembly 10, the push rod 31 moves in a direction away from the preset end point to achieve resetting.

[0071] Specifically, Figure 2 , Figure 3 and Figure 4 The figure shows the initial state (the state after resetting) of the syringe 100 equipped with the medicine bottle 200. In this state, the push rod 31 and the memory ring 22 are both located at their respective initial positions, and the one-way limit assembly 32 is in a connected state. Figure 5 Shown is the state of the syringe 100 equipped with the vial 200 during the dose setting process. Figure 6 and Figure 7 The figure shows the state of the syringe 100 equipped with the medicine bottle 200 after completing the last dose setting. In this state, the memory ring 22 reaches its own terminal position, the memory ring 22 abuts against the stop structure 211 on the memory sleeve 21, and the one-way limit assembly 32 remains connected. Figure 8 The figure shows the state of the syringe 100 equipped with the medicine bottle 200 after completing the last drug injection. In this state, the distal end of the push rod 31 reaches the preset end point, the memory ring 22 remains in contact with the stop structure 211, and the one-way limit assembly 32 remains connected. Fig. 9 and Fig.10 The figure shows the state of the syringe 100 with the medicine bottle 200 removed before resetting. In this state, the one-way limiting assembly 32 is in a disengaged state.

[0072] The preset end point of the push rod 31 can be determined according to the size of the medicine bottle 200. Usually, when the distal end of the push rod 31 reaches the end point, the push rod 31 just pushes the movable rubber plug (not shown) in the medicine bottle 200 to the distal end of the medicine bottle 200, so that all the medicine in the medicine bottle 200 can be pushed out. It should be noted that the "distal end" in the above description and the following description refers to the end of the component close to the injection site during normal operation, and conversely, the "proximal end" refers to the end of the component away from the injection site during normal operation. For ease of understanding, it is assumed that the capacity of the medicine bottle 200 is 300 IU, of which 1 IU is 0.025 ml, and the single dose setting range of the syringe 100 is 0-60 IU. If the dose set each time is 40 IU, then after 7 injections, a total of 280 IU is injected, and 20 IU remains in the medicine bottle 200. During the last dose setting process, when the set dose reaches 20IU, the memory ring 22 abuts against the stop structure 211, and the memory ring 22 is restricted from further rotating in the first clockwise direction, and cannot be adjusted to 40IU. At this time, the maximum value of the dose that can be set is 20IU, which is equal to the remaining amount in the medicine bottle 200, thereby achieving that the last set dose is equal to the last actual injection dose, and the situation where the last set dose is greater than the last actual injection dose will not occur, thereby avoiding the safety risk of insufficient actual injection volume.

[0073] Specifically, the housing assembly 10 includes a main housing 11 and a medicine chamber 12, wherein the main housing 11 further includes a jacket 111, a drum support 112, a fixed sleeve 113 and a fixed ring 114; the one-way limit assembly 32 includes a limit ring 321 and a drive sleeve 322; in addition, the syringe 100 also includes a second spring 40, a third spring 50, a push rod sleeve 60, a dose setting assembly 70, a rotary clutch assembly 80 and a piston 90, wherein the dose setting assembly 70 further includes a matching sleeve 71 and a measuring cylinder 72, and the rotary clutch assembly 80 further includes a clutch gear 81, a first spring 82 and a pressing member 83. The following is a detailed explanation of each component:

[0074] The outer jacket 111 has a specific structure as follows Figure 3 , Fig.11 and Fig.12 As shown, the outer sleeve 111 is arranged on the periphery of the dose setting assembly 70, the drum support 112 and the fixed sleeve 113, and is the appearance part of the syringe 100. The inner side surface of the distal end of the outer sleeve 111 is provided with a limiting groove 1111, and the limiting groove 1111 is connected to the fixed sleeve 113. The proximal end of the outer sleeve 111 is provided with a window 1112, and the window 1112 is used to observe the scale 726 of the set dose setting assembly 70.

[0075] The drum support 112 has a specific structure as follows Figure 3 , Fig.13 and Fig.14 As shown, the inner side surface of the drum bracket 112 is provided with a first internal thread 1121, and the first internal thread 1121 is threadedly connected to the matching sleeve 71 in the dose setting assembly 70. The drum bracket 112 is provided with a first fixing hole 1122 and a second fixing hole 1123. The first fixing hole 1122 is connected to the fixing sleeve 113, and the second fixing hole 1123 is connected to the fixing ring 114.

[0076] The fixed sleeve 113 has a specific structure as follows Figure 4 , Fig.13 and Fig.15 As shown, the outer side surface of the proximal end of the fixed sleeve 113 is provided with a first buckle 1131, the proximal end of the fixed sleeve 113 is inserted into the distal end of the drum support 112, and the first buckle 1131 is buckled in the first fixing hole 1122 of the drum support 112, so as to achieve the fixing of the fixed sleeve 113 and the drum support 112. The outer side surface of the fixed sleeve 113 is also provided with a second buckle 1132, and the second buckle 1132 is buckled in the limiting groove 1111 of the outer sleeve 111, so as to achieve the fixing of the fixed sleeve 113 and the outer sleeve 111. The outer side surface of the distal end of the fixed sleeve 113 is provided with a second external thread 1133, and the second external thread 1133 is threadedly connected with the medicine chamber 12. The inner side surface of the fixed sleeve 113 is provided with a first sliding protrusion 1134, and the first sliding protrusion 1134 is embedded in the driving sleeve 322 and is slidably connected with the driving sleeve 322.

[0077] The fixing ring 114 has a specific structure as follows Figure 3 ,like Fig.16 , Fig.17 and Fig.18As shown, the fixing ring 114 is sleeved on the push rod sleeve 60, and the distal end surface of the fixing ring 114 forms a second fixing surface 1141 and a third fixing surface 1142, the second fixing surface 1141 is connected to the proximal end of the second spring 40, and the third fixing surface 1142 is connected to the proximal end of the third spring 50. The proximal end surface of the fixing ring 114 is provided with a clamping groove 1143, and the clamping groove 1143 is used to limit the dose setting assembly 70 located in the initial position from rotating in the opposite direction of the first clockwise direction. The outer side surface of the fixing ring 114 is provided with a third buckle 1144, and the third buckle 1144 is buckled in the second fixing hole 1123 of the drum bracket 112, so as to achieve the fixing of the fixing ring 114 and the drum bracket 112. Specifically, the number of the third buckles 1144 is two, and the two third buckles 1144 are symmetrically distributed with the central axis of the fixing ring 114 as the symmetry axis. Of course, in some other embodiments, the number of the third buckles 1144 can be selected to be 3, 4, 5 or more than 5. In order to facilitate assembly, the sizes of the two third buckles 1144 in the circumferential direction of the fixing ring 114 are inconsistent, and the sizes of the two second fixing holes 1123 of the drum bracket 112 are respectively adapted to the sizes of the two third buckles 1144, which is convenient for determining the assembly direction and plays a fool-proof role.

[0078] Medicine warehouse 12, the specific structure is as follows Fig.11 As shown, the medicine bin 12 is detachably connected to the distal end of the main housing 11, and a containing space 121 is formed in the medicine bin 12, and the containing space 121 is communicated with the internal space of the main housing 11. Specifically, the inner side surface of the proximal end of the medicine bin 12 is provided with a second internal thread 122, and the second internal thread 122 cooperates with the second external thread 1133 of the fixing sleeve 113 in the main housing 11, so as to achieve the fixing of the medicine bin 12 and the fixing sleeve 113. The outer side surface of the distal end of the medicine bin 12 is provided with a fifth external thread 123, and the fifth external thread 123 is used to connect the needle.

[0079] The memory sleeve 21 has a specific structure as follows Figure 3 , Fig. 22 and Fig.23 As shown, the outer side surface of the memory sleeve 21 is provided with a third external thread 212, and the third external thread 212 is threadedly connected to the memory ring 22. The inner side surface of the memory sleeve 21 is provided with a second sliding protrusion 213, and the second sliding protrusion 213 is embedded in the push rod sleeve 60 and is slidably connected to the push rod sleeve 60. The distal end surface of the memory sleeve 21 is provided with an anti-adjustment tooth 214, and the anti-adjustment tooth 214 cooperates with the clutch gear 81. The stop structure 211 is provided at the proximal end of the memory sleeve 21.

[0080] The memory ring 22 has a specific structure as follows Figure 3 , Fig.23 and Fig.24As shown, the inner side surface of the memory ring 22 is provided with a third internal thread 221, and the third internal thread 221 cooperates with the third external thread 212 of the memory sleeve 21, so as to realize the threaded connection between the memory ring 22 and the memory sleeve 21. The initial position of the memory ring 22 is located at the distal end of the memory sleeve 21. When the memory ring 22 rotates relative to the memory sleeve 21 in the first clockwise direction, the memory ring 22 moves toward the proximal end of the memory sleeve 21 until it abuts against the stop structure 211. The outer side surface of the memory ring 22 is provided with a third sliding protrusion 222, which is embedded in the matching sleeve 71 in the dose setting component 70 and is slidably connected with the matching sleeve 71. Specifically, the memory ring 22 includes a circular ring body 223 and an abutment protrusion 224, the third internal thread 221 is arranged on the inner side surface of the circular ring body 223, the third sliding protrusion 222 is arranged on the outer side surface of the circular ring body 223, and the abutment protrusion 224 is arranged on the proximal end surface of the circular ring body 223. When the abutment protrusion 224 abuts against the stop structure 211 in the circumferential direction of the circular ring body 223, the memory ring 22 is restricted from rotating in the first clockwise direction.

[0081] Push rod 31, the specific structure is as follows Fig.16 and Fig.21 As shown, the outer periphery of the push rod 31 is provided with a fourth external thread 311, which is threadedly connected to the driving sleeve 322. The outer periphery of the push rod 31 is also provided with a fourth sliding groove 312, which is extended along the length direction of the push rod 31 and is slidably connected to the push rod sleeve 60.

[0082] The specific structure of the limiting ring 321 is as follows: Figure 4 , Fig.16 and Fig. 20 As shown, the limiting ring 321, the push rod 31 and the push rod sleeve 60 are in a synchronous rotation relationship. The limiting ring 321 is sleeved on the distal end of the push rod sleeve 60. The inner side surface of the limiting ring 321 is provided with a fifth sliding protrusion 3211, which is embedded in the push rod sleeve 60 and is slidably connected with the push rod sleeve 60. The distal end surface of the limiting ring 321 is provided with a first one-way tooth 3212, which is used to connect or separate with the driving sleeve 322. The number of the first one-way teeth 3212 is multiple, and the multiple first one-way teeth 3212 are arranged around the push rod sleeve 60. The proximal end surface of the limiting ring 321 is connected to the distal end of the third spring 50.

[0083] The driving sleeve 322 has a specific structure as follows Figure 4 , Fig.16 and Fig.19As shown, the drive sleeve 322 is arranged in the main body shell and is located at the far end of the main shell 11. The inner side surface of the drive sleeve 322 is provided with a fourth internal thread 3221, and the fourth internal thread 3221 cooperates with the fourth external thread 311 of the push rod 31 to realize the threaded connection between the drive sleeve 322 and the push rod 31. When the push rod 31 rotates relative to the drive sleeve 322, the push rod 31 can move axially. A first slide groove 3222 is arranged on the outer wall of the drive sleeve 322. The first slide groove 3222 is extended along the axial direction of the drive sleeve 322. The first slide groove 3222 is slidably connected with the first sliding protrusion 1134 of the fixed sleeve 113. Through the cooperation of the first slide groove 3222 and the first sliding protrusion 1134, on the one hand, the rotation of the drive sleeve 322 relative to the shell assembly 10 is restricted, and on the other hand, the drive sleeve 322 is allowed to move axially relative to the shell assembly 10, so as to realize the connection and separation of the drive sleeve 322 and the limit ring 321. Of course, in some other embodiments, the first sliding protrusion 1134 may also be disposed on the outer wall of the driving sleeve 322 , while the first sliding groove 3222 may be disposed on the inner wall of the fixing sleeve 113 .

[0084] When the driving sleeve 322 is connected to the limiting ring 321, the one-way limiting assembly 32 is in a connected state, and the limiting ring 321 is limited to rotate in the first clockwise direction relative to the driving sleeve 322. Since the limiting ring 321 and the push rod 31 are in a synchronous rotation relationship, the push rod 31 can be limited to rotate in the first clockwise direction to prevent the push rod 31 from retreating. When the driving sleeve 322 is separated from the limiting ring 321, the one-way limiting assembly 32 is in a disengaged state, and the limiting ring 321 can rotate in the first clockwise direction relative to the driving sleeve 322, thereby driving the push rod 31 to rotate in the first clockwise direction, and the push rod 31 is driven to retreat to reset through the threaded cooperation between the push rod 31 and the driving sleeve 322.

[0085] The proximal end face of the drive sleeve 322 is connected to the distal end of the second spring 40, and the distal end of the drive sleeve 322 is used to abut against the proximal end of the medicine bottle 200 accommodated in the accommodating space 121. When the medicine bottle 200 is accommodated in the accommodating space 121, the drive sleeve 322 is pushed by the medicine bottle 200 and connected to the limiting ring 321, so that the one-way limiting component 32 is in a connected state. When the medicine bottle 200 is not accommodated in the accommodating space 121, the drive sleeve 322 loses the axial limiting effect of the medicine bottle 200, and the drive sleeve 322 can move in a direction away from the limiting ring 321 and separate from the limiting ring 321, so that the one-way limiting component 32 is in a disengaged state.

[0086] Specifically, a second one-way tooth 3223 is provided on the proximal end face of the driving sleeve 322. When a medicine bottle 200 is contained in the accommodating space 121, the second one-way tooth 3223 of the driving sleeve 322 engages with the first one-way tooth 3212 of the limiting ring 321 to limit the limiting ring 321 from rotating in the first clockwise direction relative to the driving sleeve 322. When no medicine bottle 200 is contained in the accommodating space 121, the driving sleeve 322 can move in a direction away from the limiting ring 321 so that the second one-way tooth 3223 is separated from the first one-way tooth 3212, so that the limiting ring 321 can rotate in the first clockwise direction relative to the driving sleeve 322.

[0087] Specifically, the drive sleeve 322 includes a sleeve body 3224 and an annular boss 3225, the fourth internal thread 3221 is arranged on the inner side surface of the sleeve body 3224, the second one-way tooth 3223 is arranged on the proximal end surface of the sleeve body 3224, the annular boss 3225 is arranged on the proximal end surface of the sleeve body 3224, and is arranged around the second one-way tooth 3223, the first slide groove 3222 is opened on the annular boss 3225, and the proximal end surface of the annular boss 3225 is connected to the distal end of the second spring 40.

[0088] The second spring 40 has a specific structure as follows Figure 4 and Fig.16 As shown, the proximal end of the second spring 40 is connected to the second fixing surface 1141 of the fixing ring 114 in the shell assembly 10, and the distal end of the second spring 40 is connected to the proximal end surface of the driving sleeve 322. When the medicine bottle 200 is placed in the accommodating space 121, the driving sleeve 322 is connected to the limiting ring 321, and the second spring 40 is in a compressed state. When the medicine bottle 200 in the accommodating space 121 is taken out, the driving sleeve 322 loses the axial limiting effect of the medicine bottle 200, and the second spring 40 can stretch to push the driving sleeve 322 to move in a direction away from the limiting ring 321, thereby realizing the automatic separation of the driving sleeve 322 and the limiting ring 321. When the driving sleeve 322 moves in a direction away from the limiting ring 321 until the first sliding protrusion 1134 of the fixed sleeve 113 abuts against the proximal end of the first sliding groove 3222 of the driving sleeve 322, the driving sleeve 322 is restricted from moving in a direction away from the limiting ring 321, thereby preventing the second spring 40 from pushing the driving sleeve 322 out of the fixed sleeve 113. Of course, in some other embodiments, the second spring 40 may not be provided, and when the medicine bottle 200 in the accommodating space 121 is taken out, the driving sleeve 322 may be manually pushed to move in a direction away from the limiting ring 321, so that the driving sleeve 322 is separated from the limiting ring 321.

[0089] The third spring 50 has a specific structure as follows Figure 4 and Fig.16As shown, the third spring 50 is sleeved on the push rod sleeve 60, and the proximal end of the third spring 50 is connected to the third fixed surface 1142 of the fixing ring 114 in the housing assembly 10, and the distal end of the third spring 50 is connected to the proximal end surface of the limiting ring 321. During the injection process, the push rod 31 and the limiting ring 321 rotate synchronously in the opposite direction of the first clockwise direction. When the limiting ring 321 rotates in the opposite direction of the first clockwise direction relative to the driving sleeve 322, the cooperation of the second one-way tooth 3223 and the first one-way tooth 3212 can apply a force pointing to the third fixed surface 1142 to the limiting ring 321. Since the limiting ring 321 and the third fixed surface 1142 are softly connected through the third spring 50, the limiting ring 321 can jump axially relative to the driving sleeve 322 under the action of the third spring 50, so that the limiting ring 321 can rotate relative to the driving sleeve 322, and a "clicking" sound is emitted to prompt the operator that the drug injection is in progress.

[0090] The push rod sleeve 60 has a specific structure as shown in FIG. Figure 3 , Fig.16 and Fig.21 As shown, the push rod sleeve 60 is arranged between the push rod 31 and the memory sleeve 21, the push rod sleeve 60, the push rod 31 and the memory sleeve 21 rotate synchronously, and the push rod 31 and the memory sleeve 21 can both move axially relative to the push rod sleeve 60. The inner side surface of the push rod sleeve 60 is provided with a fourth sliding protrusion 61, and the fourth sliding protrusion 61 is slidably connected with the fourth sliding groove 312 of the push rod 31. Through the cooperation of the fourth sliding protrusion 61 and the fourth sliding groove 312, on the one hand, the push rod 31 and the push rod sleeve 60 are synchronously rotated, and on the other hand, the push rod 31 is able to move axially relative to the push rod sleeve 60.

[0091] The number of the fourth sliding protrusions 61 is multiple, and the multiple fourth sliding protrusions 61 are evenly spaced along the circumference of the push rod sleeve 60. The number of the fourth sliding grooves 312 is consistent with the number of the fourth sliding protrusions 61, and the multiple fourth sliding protrusions 61 are connected to the multiple fourth sliding grooves 312 in a one-to-one correspondence. By providing multiple fourth sliding protrusions 61 and multiple fourth sliding grooves 312, the connection stability and reliability between the push rod 31 and the push rod sleeve 60 can be improved. In addition, the multiple fourth sliding protrusions 61 are evenly spaced along the circumference of the push rod sleeve 60, which can stabilize the push rod 31 on the central axis of the push rod sleeve 60, ensuring that the push rod sleeve 60 and the push rod 31 rotate around the same axis, thereby improving the stability and smoothness during rotation. Specifically, the number of the fourth sliding protrusions 61 is two, and the two fourth sliding protrusions 61 are symmetrically distributed with the central axis of the push rod sleeve 60 as the symmetry axis. Of course, in some other embodiments, the number of the fourth sliding protrusions 61 can be selected to be 3, 4, 5 or more than 5.

[0092] A second slide groove 62 is provided on the outer side of the push rod sleeve 60. The second slide groove 62 is extended along the axial direction of the push rod sleeve 60. The second slide groove 62 is slidably connected with the second sliding protrusion 213 of the memory sleeve 21. Through the cooperation of the second slide groove 62 and the second sliding protrusion 213, on the one hand, the push rod sleeve 60 and the memory sleeve 21 are synchronously rotated, and on the other hand, the memory sleeve 21 is axially moved relative to the push rod sleeve 60. The second slide groove 62 is also slidably connected with the fifth sliding protrusion 3211 of the limiting ring 321. Through the cooperation of the second slide groove 62 and the fifth sliding protrusion 3211, on the one hand, the push rod sleeve 60 and the limiting ring 321 are synchronously rotated, and on the other hand, the limiting ring 321 is axially moved relative to the push rod sleeve 60. When the third spring 50 pushes the limiting ring 321 to move in the direction away from the fixing ring 114 until the fifth sliding protrusion 3211 of the limiting ring 321 abuts against the distal end of the second sliding groove 62, the limiting ring 321 is restricted from moving in the direction away from the fixing ring 114, thereby preventing the third spring 50 from pushing the limiting ring 321 out of the push rod sleeve 60.

[0093] The number of the second chute 62 is multiple, and the multiple second chute 62 is evenly spaced along the circumference of the push rod sleeve 60. The number of the second sliding protrusions 213 is consistent with the number of the second chute 62, and the multiple second sliding protrusions 213 are connected to the multiple second chute 62 in a one-to-one correspondence. By providing multiple second sliding protrusions 213 and multiple second chute 62, the connection stability and reliability of the push rod sleeve 60 and the memory sleeve 21 can be improved. In addition, the multiple second chute 62 is evenly spaced along the circumference of the push rod sleeve 60, and the push rod sleeve 60 can be stabilized on the central axis of the memory sleeve 21, ensuring that the push rod sleeve 60 and the memory sleeve 21 rotate around the same axis, thereby improving the stability and smoothness during rotation. Specifically, the number of the second chute 62 is two, and the two second chute 62 are symmetrically distributed with the central axis of the push rod sleeve 60 as the symmetry axis. Of course, in some other embodiments, the number of the second chute 62 can be selected to be 3, 4, 5 or more than 5.

[0094] like Figure 2 , Figure 3 and Figure 5As shown, the dose setting assembly 70 is threadedly connected to the housing assembly 10, and the dose setting assembly 70 moves axially by rotating relative to the housing assembly 10. The dose setting assembly 70 rotates synchronously with the memory ring 22, and the memory ring 22 can move axially relative to the dose setting assembly 70. The dose setting assembly 70 is connected to the memory sleeve 21 through a rotating clutch assembly 80. During the dose setting process, the rotating clutch assembly 80 allows the dose setting assembly 70 and the memory sleeve 21 to move axially relative to the housing assembly 10 synchronously, and allows the dose setting assembly 70 to rotate relative to the memory sleeve 21, thereby linking the memory ring 22 to move axially relative to the memory sleeve 21; during the injection process, the rotating clutch assembly 80 allows the dose setting assembly 70 and the memory sleeve 21 to move axially and in a first straight line direction synchronously relative to the housing assembly 10, and synchronously rotates relative to the housing assembly 10 in a direction opposite to the first clockwise direction, thereby linking the memory ring 22 to move axially relative to the housing assembly 10. The body assembly 10 rotates in the opposite direction of the first clockwise direction, and the memory ring 22 is stationary relative to the memory sleeve 21 in the axial direction; during the process of the push rod 31 rotating relative to the housing assembly 10 in the first clockwise direction for resetting, the push rod 31 drives the memory sleeve 21 to rotate relative to the housing assembly 10 in the first clockwise direction through the push rod sleeve 60, and the rotating clutch assembly 80 causes the memory sleeve 21 to rotate relative to the dose setting assembly 70 in the first clockwise direction, thereby linking the memory ring 22 to move relative to the memory sleeve 21 in the first straight line direction and in the direction away from the stop structure 211 for resetting.

[0095] During the dose setting process, when it is necessary to increase the set dose, the housing assembly 10 is held by hand to keep the housing assembly 10 stationary, and the dose setting assembly 70 is rotated in the first clockwise direction. The dose setting assembly 70 moves relative to the housing assembly 10 in the opposite direction of the first linear direction. The rotary clutch assembly 80, on the one hand, enables the dose setting assembly 70 and the memory sleeve 21 to move synchronously relative to the housing assembly 10 in the opposite direction of the first linear direction, and on the other hand, cuts off the torque transmission between the dose setting assembly 70 and the memory sleeve 21, so that the memory sleeve 21 does not rotate with the rotation of the dose setting assembly 70, that is, the dose setting assembly 70 rotates relative to the memory sleeve 21, and the dose setting assembly 70 rotates synchronously with the memory ring 22, so that the memory ring 22 will rotate relative to the memory sleeve 21 in the first clockwise direction, so that the memory ring 22 can move in the opposite direction of the first linear direction and in the direction close to the stop structure 211. When the adjustment is excessive and the set dose needs to be reduced, the dose setting assembly 70 can be rotated in the reverse direction. The rotating clutch assembly 80, on the one hand, causes the dose setting assembly 70 and the memory sleeve 21 to move synchronously relative to the housing assembly 10 in the first straight line direction, and on the other hand, causes the dose setting assembly 70 to rotate relative to the memory sleeve 21 in the opposite direction of the first clockwise direction. The memory ring 22 rotates with the dose setting assembly 70 relative to the memory sleeve 21 in the opposite direction of the first clockwise direction, thereby moving in the first straight line direction and in the direction away from the stop structure 211.

[0096] During the injection process, the dose setting assembly 70 is rotated in the direction opposite to the first clockwise direction, and the dose setting assembly 70 moves in the first straight line direction relative to the housing assembly 10. The rotary clutch assembly 80, on the one hand, enables the dose setting assembly 70 and the memory sleeve 21 to move synchronously in the first straight line direction relative to the housing assembly 10, and on the other hand, enables the dose setting assembly 70 and the memory sleeve 21 to rotate synchronously in the direction opposite to the first clockwise direction. Since the memory ring 22 rotates synchronously with the memory sleeve 21, the relative position of the memory ring 22 and the memory sleeve 21 does not change, that is, the memory ring 22 is stationary relative to the memory sleeve 21 in the axial direction, and the memory sleeve 21 drives the push rod 31 to rotate in the direction opposite to the first clockwise direction through the push rod sleeve 60, so that the push rod 31 moves in the first straight line direction and in the direction of the preset end point to achieve push injection.

[0097] During the process that the push rod 31 rotates relative to the housing assembly 10 in the first clockwise direction for resetting, the push rod 31 moves axially relative to the housing assembly 10 in a direction away from the preset end point, and the push rod 31 drives the memory sleeve 21 to rotate relative to the housing assembly 10 in the first clockwise direction through the push rod sleeve 60, and the rotary clutch assembly 80 cuts off the torque transmission between the memory sleeve 21 and the dose setting assembly 70, so that the memory sleeve 21 rotates relative to the dose setting assembly 70 in the first clockwise direction. When the dose setting assembly 70 does not rotate, the memory ring 22 does not rotate either, that is, the memory sleeve 21 can rotate relative to the memory ring 22, thereby linking the memory ring 22 to move relative to the memory sleeve 21 in the first straight line direction and in a direction away from the stop structure 211 for resetting.

[0098] Matching sleeve 71, the specific structure is as follows Figure 3 , Fig. 22 , Fig.25 and Fig.26As shown, the matching sleeve 71 is arranged between the memory ring 22 and the drum support 112, and the inner side surface of the matching sleeve 71 is provided with a third slide groove 711, and the third slide groove 711 is extended along the axial direction of the matching sleeve 71. The third slide groove 711 is slidably connected with the third sliding protrusion 222 of the memory ring 22, on the one hand, to achieve synchronous rotation of the matching sleeve 71 and the memory ring 22, and on the other hand, to meet the axial movement of the memory ring 22 relative to the matching sleeve 71. The outer side surface of the matching sleeve 71 is provided with a first external thread 712, and the first external thread 712 is matched with the first internal thread 1121 of the drum support 112, so as to achieve the threaded connection between the matching sleeve 71 and the drum support 112. When the matching sleeve 71 rotates relative to the drum support 112, the matching sleeve 71 can move axially. The proximal end surface of the matching sleeve 71 is provided with a connecting boss 713, and the connecting boss 713 is connected to the measuring cylinder 72. The distal end of the mating sleeve 71 has a first annular protrusion 714, and a positive adjustment tooth 715 is provided on the side of the first annular protrusion 714 facing the inside of the mating sleeve 71, and the positive adjustment tooth 715 cooperates with the clutch gear 81. A claw 716 is provided on the distal end surface of the mating sleeve 71, and when the claw 716 is engaged with the locking groove 1143 of the fixing ring 114, the dose setting assembly 70 is restricted from rotating in the opposite direction of the first clockwise direction. In the injection step, the dose setting assembly 70 rotates in the opposite direction of the first clockwise direction while moving in the first linear direction. When the claw 716 of the mating sleeve 71 is embedded in the locking groove 1143 of the fixing ring 114, the dose setting assembly 70 is restricted from continuing to rotate in the opposite direction of the first clockwise direction, and is also restricted from continuing to move in the first linear direction. The dose setting assembly 70 returns to its original position, thereby prompting the operator that the drug injection is completed. Specifically, the number of the claws 716 can be multiple, and the multiple claws 716 are distributed at intervals along the circumference of the matching sleeve 71. The number of the locking grooves 1143 is consistent with the number of the claws 716, and the multiple claws 716 are connected to the multiple locking grooves 1143 in a one-to-one correspondence.

[0099] The measuring cylinder 72 has a specific structure as follows Figure 3 , Fig. 22 , Fig. 27 and Fig.28As shown, the measuring cylinder 72 is located at the outer periphery of the matching sleeve 71, and a matching gap 73 is formed between the measuring cylinder 72 and the matching sleeve 71. The rotating cylinder support 112 in the housing assembly 10 is inserted into the matching gap 73 and is threadedly connected to the outer side of the matching sleeve 71. The outer sleeve 111 in the housing assembly 10 is located at the outer periphery of the measuring cylinder 72. The proximal end of the measuring cylinder 72 is provided with a connecting hole 721, and the connecting boss 713 of the matching sleeve 71 is inserted into the connecting hole 721 and bonded, so as to achieve the fixing of the measuring cylinder 72 and the matching sleeve 71, and ensure that the measuring cylinder 72 and the matching sleeve 71 rotate synchronously and move synchronously along the axial direction. The proximal end of the measuring cylinder 72 has a second annular protrusion 722, and the side of the second annular protrusion 722 facing the inside of the measuring cylinder 72 is connected to the proximal end of the first spring 82, and the side of the second annular protrusion 722 facing the inside of the measuring cylinder 72 is provided with a limiting boss 723, and the limiting boss 723 is arranged around the first spring 82 to limit the movement of the first spring 82 away from the central axis. The second annular protrusion 722 has a through hole 724, and the through hole 724 is used for the pressing member 83 to extend into the measuring cylinder 72 and then connect with the proximal end surface of the memory sleeve 21. The proximal end of the measuring cylinder 72 extending outside the outer sleeve 111 is provided with a pattern 725 for enhancing friction, so as to facilitate the operator to rotate. The outer side surface of the measuring cylinder 72 is provided with a scale 726 for indicating the set dose, and the multiple scales 726 are arranged in a spiral, and the scales 726 are observed by the operator through the window 1112 of the outer sleeve 111.

[0100] The clutch gear 81 has a specific structure as shown in FIG. Figure 3 and Fig. 22 As shown, the clutch gear 81 is rotatably sleeved on the push rod sleeve 60, and teeth are provided at both ends of the clutch gear 81. The teeth at the distal end of the clutch gear 81 cooperate with the positive adjustment teeth 715 on the first annular protrusion 714 of the matching sleeve 71 of the dose setting assembly 70, and the teeth at the proximal end of the clutch gear 81 cooperate with the negative adjustment teeth 214 of the memory sleeve 21. When the dose setting assembly 70 rotates in the first clockwise direction, the positive adjustment teeth 715 can apply a thrust to the clutch gear 81 in the opposite direction of the first linear direction, and when the dose setting assembly 70 rotates in the opposite direction of the first clockwise direction, the clutch gear 81 can apply a thrust to the negative adjustment teeth 214 in the opposite direction of the first linear direction.

[0101] The first spring 82 has a specific structure as follows Fig. 27 As shown, the first spring 82 is sleeved on the outer circumference of the pressing member 83 and is located in the limiting boss 723 on the second annular protrusion 722 of the measuring cylinder 72. The proximal end of the first spring 82 is connected to the second annular protrusion 722 of the measuring cylinder 72 of the dose setting assembly 70, and the distal end of the first spring 82 is connected to the portion of the pressing member 83 inserted into the dose setting assembly 70.

[0102] The pressing member 83 has a specific structure as follows Fig. 27As shown, the pressing member 83 is inserted into the dose setting assembly 70 and abuts against the proximal end surface of the memory sleeve 21 . The portion of the pressing member 83 inserted into the dose setting assembly 70 has a first fixing surface 8311 , which is connected to the distal end of the first spring 82 .

[0103] Specifically, the pressing member 83 includes a connecting sleeve 831 and a tail handle 832. Fig. 27 and Fig.29 As shown, the connecting sleeve 831 includes a first connecting segment 8312 and a second connecting segment 8313. The first connecting segment 8312 can be sleeved on the proximal end of the push rod sleeve 60 and abut against the proximal end surface of the memory sleeve 21. The distal end of the second connecting segment 8313 is connected to the proximal end of the first connecting segment 8312. The proximal end of the second connecting segment 8313 is penetrated by the through hole 724 of the measuring cylinder 72 of the dose setting assembly 70. The diameter of the second connecting segment 8313 is smaller than the diameter of the first connecting segment 8312. The proximal end surface of the first connecting segment 8312 forms a first fixing surface 8311 surrounding the second connecting segment 8313. The first spring 82 is sleeved on the second connecting segment 8313. The inner side surface of the second connecting segment 8313 is provided with a fixing protrusion 8314, and the fixing protrusion 8314 is connected to the tail handle 832.

[0104] like Fig. 27 and Fig.30 As shown, the tail handle 832 includes a pressing plate 8321 and a connecting column 8322. The diameter of the pressing plate 8321 is larger than the diameter of the connecting column 8322 to facilitate the operator to press. A fixing groove 8323 is provided on the circumferential side of the connecting column 8322. The fixing groove 8323 is arranged around the connecting column 8322. The proximal end of the connecting column 8322 is connected to the pressing plate 8321, and the distal end of the connecting column 8322 is inserted into the second connecting segment 8313, and the fixing protrusion 8314 of the second connecting segment 8313 is embedded in the fixing groove 8323, thereby realizing the axial fixation of the connecting column 8322 and the second connecting segment 8313 to prevent the connecting column 8322 from slipping out of the second connecting segment 8313.

[0105] In the step of increasing the set dose, the dose setting assembly 70 is rotated in the first clockwise direction, and the dose setting assembly 70 moves in the opposite direction of the first linear direction relative to the housing assembly 10. The dose setting assembly 70 pushes the memory sleeve 21 to move axially synchronously through the clutch gear 81. The positive adjustment teeth 715 on the first annular protrusion 714 of the dose setting assembly 70 exert a thrust in the opposite direction of the first linear direction on the clutch gear 81 when rotating. The thrust is transmitted to the memory sleeve 21 through the clutch gear 81, and then transmitted to the pressing member 83. Since the pressing member 83 is in contact with the second linear direction of the dose setting assembly 70, the memory sleeve 21 is pressed against the pressing member 83. The annular protrusion 722 is softly connected by the first spring 82, so that the clutch gear 81 and the memory sleeve 21 can jump axially along the relative positive adjustment tooth 715 as a whole as the dose setting assembly 70 rotates, so that the dose setting assembly 70 rotates relative to the memory sleeve 21, that is, the memory sleeve 21 will not rotate with the rotation of the dose setting assembly 70, and will not drive the push rod sleeve 60 and the push rod 31 to rotate, that is, the injection action will not be performed. During this process, the positive adjustment tooth 715 and the clutch gear 81 will slide relative to each other, making a "clicking" sound to prompt the operator that the set dose is being increased.

[0106] In the step of reducing the set dose, the dose setting component 70 is rotated in the opposite direction of the first clockwise direction, and the dose setting component 70 moves relative to the housing in the first straight line direction. The dose setting component 70 pushes the pressing member 83, the memory sleeve 21 and the clutch gear 81 to move synchronously along the axial direction through the first spring 82. The positive adjustment tooth 715 meshes with the clutch gear 81 and rotates synchronously. When the clutch gear 81 rotates, it applies a thrust in the opposite direction of the first straight line direction to the negative adjustment tooth 214. The thrust is transmitted to the pressing member 83 through the memory sleeve 21. Since the pressing member 83 is in contact with the dose setting member 21, the memory sleeve 21 is pressed. The second annular protrusion 722 of the assembly 70 is softly connected by the first spring 82, so that the memory sleeve 21 can jump axially relative to the clutch gear 81 as the dose setting assembly 70 rotates, so that the dose setting assembly 70 rotates relative to the memory sleeve 21, that is, the memory sleeve 21 will not rotate as the dose setting assembly 70 rotates, and will not drive the push rod sleeve 60 and the push rod 31 to rotate, that is, the injection action will not be performed. During this process, the clutch gear 81 and the counter-adjustment tooth 214 will slide relative to each other, making a "clicking" sound to prompt the operator that the set dose is being reduced.

[0107] During the injection process, the pressing member 83 is pressed toward the first straight line direction, and the pressing force is sequentially transmitted to the memory sleeve 21, the clutch gear 81 and the dose setting assembly 70 through the pressing member 83. The dose setting assembly 70 is driven to rotate in the opposite direction of the first clockwise direction through the threaded cooperation between the dose setting assembly 70 and the housing assembly 10, so that the dose setting assembly 70 moves toward the first straight line direction while rotating in the opposite direction of the first clockwise direction. Since the positive adjustment ring tooth 715, the clutch gear 81 and the negative adjustment ring tooth 214 are meshed together under the pressing force and cannot slide relative to each other, the dose setting assembly 70 can drive the memory sleeve 21 to rotate synchronously through the clutch gear 81, and the memory sleeve 21 then drives the push rod 31 to rotate synchronously through the push rod sleeve 60, so that the push rod 31 moves toward the first straight line direction to achieve push injection. During the injection step, the push rod sleeve 60 only performs rotational motion without linear movement. The dose setting assembly 70, the clutch gear 81 and the memory sleeve 21 move together relative to the push rod sleeve 60 in the first linear direction. The push rod 31 also moves relative to the push rod sleeve 60 in the first linear direction.

[0108] When the push rod 31 rotates in the first clockwise direction for resetting, the empty medicine bottle 200 is taken out of the accommodating space 121, and the second spring 40 pushes the driving sleeve 322 to move in the direction away from the limiting ring 321, so that the driving sleeve 322 is separated from the limiting ring 321, and the push rod 31 is rotated in the first clockwise direction. The threaded cooperation between the push rod 31 and the driving sleeve 322 drives the push rod 31 to move in the opposite direction of the first straight line direction for resetting. The push rod 31 drives the memory sleeve 21 to rotate synchronously in the first clockwise direction through the push rod sleeve 60. During the rotation of the memory sleeve 21, the clutch gear 81 applies a force pointing to the first straight line direction to the memory sleeve 21 through the counter-adjustment tooth 214. The thrust in the opposite direction is transmitted to the pressing member 83 through the memory sleeve 21. Since the pressing member 83 is softly connected to the second annular protrusion 722 of the dose setting assembly 70 through the first spring 82, the memory sleeve 21 can jump axially relative to the clutch gear 81, so that the memory sleeve 21 rotates relative to the clutch gear 81, that is, the clutch gear 81 does not rotate with the rotation of the memory sleeve 21, the clutch gear 81 does not rotate, and the dose setting assembly 70 and the memory ring 22 do not rotate, that is, the memory sleeve 21 can rotate relative to the memory ring 22 in the first clockwise direction, so that the memory ring 22 moves in the first straight line direction and in the direction away from the stop structure 211 for reset.

[0109] The piston 90 has a specific structure as shown in FIG. Figure 8 and Fig.11As shown, the piston 90 is fixedly sleeved on the distal end of the push rod 31. When the push rod 31 moves, the piston 90 pushes the rubber plug in the medicine bottle 200, thereby pushing the medicine in the medicine bottle 200 through the rubber plug to achieve push injection.

[0110] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A syringe, characterized in that: include: A housing assembly, wherein the housing assembly is provided with a receiving space for receiving a medicine bottle; A memory mechanism, the memory mechanism comprising a memory sleeve and a memory ring, one end of the memory sleeve is provided with a stop structure, and the memory ring is threadedly sleeved on the memory sleeve; during the dose setting process, the memory ring rotates relative to the memory sleeve, and when the memory ring abuts against the stop structure, the memory ring is restricted from rotating relative to the memory sleeve in a first clockwise direction; during the injection process, the memory sleeve and the memory ring synchronously rotate relative to the housing assembly in a direction opposite to the first clockwise direction; An injection mechanism, the injection mechanism includes a push rod and a one-way limit assembly connected to the push rod, the push rod rotates synchronously with the memory sleeve, the push rod can move axially when rotating relative to the shell assembly, the distal end of the push rod is used to extend into the medicine bottle accommodated in the accommodating space to perform push injection; when the memory ring abuts against the stop structure, when the injection is completed, the distal end of the push rod reaches a preset end point; when the medicine bottle is accommodated in the accommodating space, the one-way limit assembly is in a connected state, and the push rod is restricted from rotating in the first clockwise direction relative to the shell assembly; when the medicine bottle is not accommodated in the accommodating space, the one-way limit assembly is in a disengaged state, and the push rod can rotate in the first clockwise direction relative to the shell assembly, thereby linking the memory sleeve to rotate in the first clockwise direction relative to the memory ring, thereby resetting the push rod and the memory ring at the same time.

2. The syringe according to claim 1, characterized in that: The syringe further comprises a push rod sleeve, a dose setting assembly and a rotary clutch assembly, wherein the push rod sleeve is sleeved on the push rod, the memory sleeve is sleeved on the push rod sleeve, the push rod, the push rod sleeve and the memory sleeve rotate synchronously, and the push rod and the memory sleeve can both move axially relative to the push rod sleeve; the dose setting assembly is threadedly connected to the housing assembly, the dose setting assembly moves axially by rotating relative to the housing assembly, the dose setting assembly rotates synchronously with the memory ring, the memory ring can move axially relative to the dose setting assembly, and the dose setting assembly is connected to the memory sleeve via the rotary clutch assembly; During the dose setting process, the rotary clutch assembly enables the dose setting assembly and the memory sleeve to synchronously move axially relative to the housing assembly, and enables the dose setting assembly to rotate relative to the memory sleeve, thereby linking the memory ring to move axially relative to the memory sleeve; during the injection process, the rotary clutch assembly enables the dose setting assembly and the memory sleeve to synchronously move axially and in a first linear direction relative to the housing assembly, and synchronously rotate relative to the housing assembly in the opposite direction of the first clockwise direction, thereby linking the memory ring to rotate relative to the housing assembly in the opposite direction of the first clockwise direction, and the memory ring is stationary relative to the memory sleeve in the axial direction; during the process in which the push rod rotates relative to the housing assembly in the first clockwise direction for resetting, the push rod drives the memory sleeve to rotate relative to the housing assembly in the first clockwise direction through the push rod sleeve, and the rotary clutch assembly enables the memory sleeve to rotate relative to the dose setting assembly in the first clockwise direction, thereby linking the memory ring to move relative to the memory sleeve in the first linear direction and in a direction away from the stop structure for resetting.

3. The syringe according to claim 2, characterized in that: The dose setting component is provided with a first annular protrusion surrounding the push rod sleeve at the distal end, and a second annular protrusion is provided at the proximal end of the dose setting component. A positive adjustment tooth is provided on the proximal end surface of the first annular protrusion, and a negative adjustment tooth is provided on the distal end surface of the memory sleeve. The rotary clutch assembly comprises a clutch gear, a first spring and a pressing piece, the clutch gear is sleeved on the push rod sleeve, the two ends of the clutch gear are respectively matched with the positive adjustment tooth and the negative adjustment tooth, the distal end of the pressing piece is inserted into the dose setting assembly and abuts against the proximal end surface of the memory sleeve, the portion of the pressing piece inserted into the dose setting assembly has a first fixed surface, and the two ends of the first spring are respectively abutted against the first fixed surface and the second annular protrusion; During the dose setting process, when the dose setting component rotates in the first clockwise direction relative to the housing component, the clutch gear jumps axially relative to the positive adjustment tooth under the action of the first spring, so that the dose setting component rotates relative to the memory sleeve; when the dose setting component rotates in the opposite direction of the first clockwise direction relative to the housing component, the clutch gear rotates synchronously with the positive adjustment tooth, and the memory sleeve jumps axially relative to the clutch gear under the action of the first spring, so that the dose setting component rotates relative to the memory sleeve; During the injection process, the pressing member pushes the memory sleeve, so that the reverse adjustment tooth meshes with the clutch gear, and the clutch gear meshes with the positive adjustment tooth, thereby causing the memory sleeve, the clutch gear and the dose setting assembly to rotate synchronously relative to the housing assembly in the direction opposite to the first clockwise direction; during the process of the push rod rotating in the first clockwise direction for resetting, the push rod drives the memory sleeve to rotate synchronously through the push rod sleeve, and the memory sleeve jumps axially relative to the clutch gear under the action of the first spring, thereby causing the memory sleeve to rotate relative to the dose setting assembly.

4. The syringe according to claim 2, characterized in that: The dose setting assembly includes a measuring cylinder and a matching sleeve that are fixedly connected, the outer side of the measuring cylinder is provided with a scale, the measuring cylinder is located at the outer circumference of the matching sleeve, a matching gap is formed between the measuring cylinder and the matching sleeve, the housing assembly is partially inserted into the matching gap and is threadedly connected to the outer side of the matching sleeve, the memory ring is installed inside the matching sleeve and rotates synchronously with the matching sleeve, and the memory ring can move axially relative to the matching sleeve.

5. The syringe according to claim 1, characterized in that: The one-way limiting assembly comprises a limiting ring and a driving sleeve sleeved on the outer circumference of the push rod, the limiting ring and the push rod rotate synchronously, and the push rod can move axially relative to the limiting ring; the driving sleeve is threadedly connected to the push rod, the distal end of the driving sleeve is used to abut against the proximal end of the medicine bottle accommodated in the accommodating space, and the driving sleeve is allowed to move axially relative to the shell assembly, but is restricted from rotating relative to the shell assembly; In the connected state, the limit ring is connected to the proximal end of the drive sleeve, and the limit ring is restricted from rotating in the first clockwise direction relative to the drive sleeve; in the disengaged state, the limit ring is separated from the proximal end of the drive sleeve, and the limit ring can rotate in the first clockwise direction relative to the drive sleeve.

6. The syringe according to claim 5, characterized in that: The shell assembly has a second fixed surface, which is arranged facing the proximal end surface of the drive sleeve; the syringe also includes a second spring, and the two ends of the second spring are respectively connected to the second fixed surface and the proximal end surface of the drive sleeve; when the medicine bottle is contained in the accommodating space, the second spring is in a compressed state; when the medicine bottle contained in the accommodating space is taken out, the second spring stretches to push the drive sleeve to move in a direction away from the limiting ring, thereby separating the drive sleeve from the limiting ring.

7. The syringe according to claim 5, characterized in that: A first one-way tooth is arranged on the distal end face of the limiting ring, and a second one-way tooth is arranged on the proximal end face of the driving sleeve; when the medicine bottle is accommodated in the accommodating space, the first one-way tooth is meshed with the second one-way tooth to limit the limiting ring from rotating in the first clockwise direction relative to the driving sleeve; when the medicine bottle is not accommodated in the accommodating space, the driving sleeve can move in the direction away from the limiting ring so that the first one-way tooth is separated from the second one-way tooth, so that the limiting ring can rotate in the first clockwise direction relative to the driving sleeve.

8. The syringe according to claim 7, characterized in that: The shell assembly has a third fixed surface, and the third fixed surface is arranged facing the proximal end surface of the limiting ring; the syringe also includes a third spring, and the two ends of the third spring are respectively connected to the third fixed surface and the proximal end surface of the limiting ring; when the first one-way tooth cooperates with the second one-way tooth and the limiting ring rotates in the opposite direction of the first clockwise direction relative to the shell assembly, the limiting ring jumps axially relative to the drive sleeve under the action of the third spring, thereby causing the limiting ring to rotate relative to the drive sleeve.

9. The syringe according to any one of claims 5 to 8, characterized in that: The inner wall of the housing assembly is provided with a first sliding protrusion, the outer wall of the driving sleeve is provided with a first sliding groove, the first sliding groove is extended along the axial direction of the driving sleeve, and the first sliding protrusion is slidably connected to the first sliding groove; Alternatively, a first slide groove is provided on the inner wall of the shell assembly, and the first slide groove is extended along the axial direction of the drive sleeve. A first sliding protrusion is provided on the outer wall of the drive sleeve, and the first sliding protrusion is slidably connected to the first slide groove.

10. The syringe according to any one of claims 5 to 8, characterized in that: The shell assembly includes a main shell and a medicine chamber. The drive sleeve is located inside the main shell and at the distal end of the main shell. The medicine chamber is detachably connected to the distal end of the main shell. The accommodating space is formed inside the medicine chamber, and the accommodating space is connected to the internal space of the main shell.

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