Medicine bin pre-assembly for automatic injection pen

Abstract

The utility model relates to a medicine bin pre-assembly for an automatic injection pen. The medicine bin pre-assembly is formed by pre-assembling a PFS installation sleeve, an excitation sleeve and a pen cap base together. A mounting sleeve is nested in the excitation sleeve; a cavity is formed in the PFS mounting sleeve and is used for mounting and fixing the pre-filled syringe; and the pen cap base is connected and mounted at the bottom of the excitation sleeve or the outer sleeve. The medicine bin pre-assembly for the automatic injection pen is simple in structure and easy to manufacture, can be conveniently combined together to serve as a whole to be delivered to a medicine production enterprise and finally assembled with a PFS, is convenient to assemble and operate, and enables the PFS to be rapidly installed in the medicine bin pre-assembly for the automatic injection pen to be reliably fixed.

Description

Technical Field

[0001] The utility model relates to an auto-injector, belonging to the field of medical syringes. Background Art

[0002] An auto-injector is a syringe product that is convenient for patients or the general public to operate; when manufacturers produce, they first fill the liquid medicine in the syringe to form a prefilled syringe (Prefilled Syringe, PFS, also known as a drug-loaded syringe), as Figure 1 、 Figure 2 shown; then the PFS is loaded into the auto-injection device to form an auto-injector for transportation and sales. After obtaining the auto-injector, consumers use it as needed, remove the pen cap, then press it on the injection site of the patient to activate the injection, and finally remove the injection pen to complete the automatic injection of the liquid medicine; compared with traditional syringes, the processes of sucking medicine, pricking the needle, and pushing the medicine with a disposable syringe are omitted, the operation is more convenient, and the injection dose can be guaranteed, and the deviation of the injection dose will not be caused by unskilled operation.

[0003] At present, there are many auto-injectors for PFS with a one-time fully automatic injection function on the market, which is convenient for patients to use. However, due to regulatory requirements, the needle needs to be shielded before and after use to avoid needle injury, so generally two sets of spring systems are required inside to implement the functions of pushing the medicine and shielding respectively. Therefore, the structure of the auto-injector is generally relatively complex, which leads to the complexity of the assembly of the auto-injection device with the PFS.

[0004] However, after the pharmaceutical manufacturer completes the production of the medicine and fills it to form the PFS, when assembling the whole pen, it is often hoped that the assembly process can be simplified as much as possible, that is, most of the structural parts of the auto-injection device are completed at the production manufacturer's end of the auto-injection device, which can reduce the facilities and equipment for loading the PFS and improve the assembly efficiency.

[0005] Therefore, in combination with the final assembly requirements of the pharmaceutical manufacturer and the safety and convenient use requirements of the auto-injector at the terminal, it is necessary to improve the structure of the auto-injector, especially to optimize the structure of the auto-injection device.

[0006] To simplify the assembly process, it is best to install the PFS into a special medicine storage component, and then assemble it with other components to be able to use; therefore, for the auto-injection requirement, a special medicine storage pre-component can be designed. Summary of the Utility Model

[0007] The purpose of the present utility model is to provide a pre - assembly component for a drug cartridge of an auto - injector pen, which can form a whole, facilitating delivery to pharmaceutical manufacturers, assembling with a PFS, and then quickly assembling with a functional pre - assembly component to form a usable auto - injector pen; the overall structure is simple and easy to assemble.

[0008] To achieve the above - mentioned utility model purpose, the present utility model provides a pre - assembly component for a drug cartridge of an auto - injector pen, which is formed by pre - assembling a PFS installation sleeve, a firing sleeve, and a pen cap base together;

[0009] The firing sleeve is nested and installed with the installation sleeve;

[0010] The PFS installation sleeve is provided with a cavity for installing and fixing a pre - filled syringe;

[0011] The bottom of the firing sleeve or the outer sleeve is connected and installed with the pen cap base.

[0012] As a further improvement of the present utility model, it further includes an outer sleeve;

[0013] The outer sleeve is provided with a hollow barrel wall, both ends of the hollow barrel wall are provided with openings, and an accommodation cavity is formed inside;

[0014] The middle - lower part of the hollow barrel wall is provided with a sliding guide groove for connecting the firing sleeve. The firing sleeve is installed inside the outer sleeve and can slide along the sliding guide groove;

[0015] Furthermore, the middle - upper part of the outer sleeve is provided with a clamping and limiting structure for installing and fixing a functional pre - assembly component.

[0016] As a further improvement of the present utility model, the lower part of the PFS installation sleeve is an accommodation cavity for storing the syringe of the pre - filled syringe;

[0017] The upper part of the PFS installation sleeve is an accommodation cavity for storing the flange of the pre - filled syringe;

[0018] Between the accommodation cavity at the lower part and the accommodation cavity at the upper part of the PFS installation sleeve is a flange support.

[0019] Furthermore, several flange spring claws are provided above the flange support, and the top of the flange spring claws is provided with an inward - facing limiting hook;

[0020] The flange spring claws and the limiting hooks are separated by a relief part, and the relief part forms a channel for the firing push piece of the firing sleeve to pass through.

[0021] Furthermore, the bottom of the accommodation cavity at the lower part of the PFS installation sleeve contracts inward to form a shoulder support;

[0022] The shoulder of the syringe of the pre - filled syringe abuts against the inner side of the shoulder support.

[0023] Furthermore, an elastic groove is provided at the shoulder rest, and the free end of the shoulder rest can be elastically opened outward.

[0024] As a further improvement of the present utility model, the excitation sleeve is provided with a sleeve wall, inside of which is a sleeve cavity for accommodating the PFS installation sleeve;

[0025] The sleeve wall extends upward to form a number of excitation push pieces;

[0026] The excitation push piece freely passes through the PFS mounting sleeve;

[0027] A plurality of mounting claws are arranged on the top of the sleeve wall and below the excitation push piece, and the excitation sleeve is mounted in the outer sleeve through the mounting claws.

[0028] Furthermore, the mounting claw is an elastic claw, and the top of the elastic claw extends outward to form a hook body;

[0029] The spring claw can be elastically deformed inwards, driving the hook body to move inwards;

[0030] The hook body is installed in the sliding guide groove of the outer sleeve, and the hook body and the sliding guide groove form a sliding guide.

[0031] Furthermore, the bottom of the excitation sleeve extends inwardly to form an excitation abutment portion, and a through hole is provided in the middle of the excitation abutment portion for the needle of the filling syringe and the protective cap and the pen cap support in the middle of the pen cap base to pass through.

[0032] As a further improvement of the utility model, the pen cap base is provided with a base wall, and the base wall abuts against the bottom of the outer sleeve;

[0033] A pen cap holder is provided on the inner side of the base wall, and a groove is formed on the upper part of the pen cap holder to form an elastic wall structure; the top of the pen cap holder extends inward to form a claw; the pen cap holder and the claw match the protective cap of the filling syringe;

[0034] The pen cap base is detachably connected to the excitation sleeve.

[0035] The prefilled syringe is loaded into the medicine chamber pre-assembly; in particular, the flange of the prefilled syringe is inserted into the installation cavity formed by the flange spring claw, and the shoulder is pressed against the shoulder support, and the protective cap is inserted into the pen cap support of the pen cap base and is hooked by the claw; a combination is formed.

[0036] When using the automatic injection pen formed by the drug chamber pre-assembly of the automatic injection pen of the utility model, the pen cap base is first removed; during the removal of the pen cap base, the protective cap is hooked by the claws and removed together with the pen cap base, and the protective cap is stored in the pen cap tray;

[0037] At this time, the needle is in a usable state but still located within the firing sleeve. The firing abutment at the bottom of the firing sleeve serves as a shield for the needle and is located below the needle to shield the needle and prevent direct contact with the needle.

[0038] Then, needle insertion is performed; hold the outer sleeve by hand, press the firing abutment at the bottom of the firing sleeve against the site to be injected, and then apply a downward force to the outer sleeve; at this time, for the entire auto-injector pen, except for the firing sleeve being pressed against the skin, all other components move downward along with the outer sleeve, and the needle also moves downward, passes through the through-hole, and pierces into the skin of the site to be injected.

[0039] At this time, the auto-injector pen starts to be fired and operate.

[0040] The drug cartridge pre-assembly of the auto-injector pen of the present utility model has a simple structure, is easy to manufacture, and can be conveniently assembled together. It is delivered to the pharmaceutical manufacturing enterprise as a whole and finally assembled with the PFS. The assembly operation is convenient, enabling the PFS to be quickly installed into the drug cartridge pre-assembly of the auto-injector pen of the present utility model and obtaining reliable fixation. Description of the Drawings

[0041] Figure 1 is a schematic structural diagram of a pre-filled syringe (PFS);

[0042] Figure 2 is an internal cross-sectional view of a pre-filled syringe (PFS);

[0043] In the figure, 1 - pre-filled syringe (PFS); 11 - syringe (sliding sleeve), 12 - syringe barrel (container, containing the medicine), 13 - flange (also known as flange), 14 - injection needle, 15 - piston, 16 - protective cap (also known as protective sheath), 17 - shoulder;

[0044] Figure 3 is a schematic diagram of the assembly preparation of the auto-injector pen of the present utility model;

[0045] Figure 4 is a schematic diagram of the assembly process of the auto-injector pen of the present utility model;

[0046] Figure 5 is a schematic diagram of the overall structure of the drug cartridge pre-assembly of the present utility model;

[0047] Figure 6 is a schematic diagram of the assembly preparation of the drug cartridge pre-assembly of the present utility model;

[0048] Figure 7Internal cross-sectional view of the overall structure of the medicine cartridge pre-assembly of the present utility model;

[0049] Figure 8 Schematic diagram of the overall structure of the outer sleeve of the present utility model;

[0050] Figure 9 Overall cross-sectional view of the outer sleeve of the present utility model;

[0051] Figure 10 Schematic diagram of the overall structure of the PFS installation sleeve of the present utility model;

[0052] Figure 11 Overall cross-sectional view of the PFS installation sleeve of the present utility model;

[0053] Figure 12 Connection schematic diagram of the pre-filled syringe and the PFS installation sleeve;

[0054] Figure 13 For Figure 12 Cross-sectional view;

[0055] Figure 14 Schematic diagram of the overall structure of the activation sleeve of the present utility model;

[0056] Figure 15 Internal structure schematic diagram of the activation sleeve of the present utility model;

[0057] Figure 16 Schematic diagram of the overall structure of the pen cap base of the present utility model;

[0058] Figure 17 Internal structure schematic diagram of the pen cap base of the present utility model;

[0059] Figure 18 Cross-sectional view of the connection state of the pre-filled syringe and the pen cap base;

[0060] Figure 19 Partial internal structure schematic diagram of the connection state of the pre-filled syringe and the pen cap base;

[0061] Figure 20 Schematic diagram of the connection part structure of the activation sleeve and the pen cap base;

[0062] Figure 21 Overall structure schematic diagram of the activation sleeve adopting a snap ring structure;

[0063] Figure 22 Overall structure schematic diagram of the pen cap base adopting a slot structure;

[0064] Figure 23 Schematic diagram of the structure combining the snap ring of the pen cap base and the slot of the activation sleeve;

[0065] Figure 24 Schematic diagram of the improved structure of the outer sleeve of the present utility model;

[0066] Figure 25 Schematic diagram of the improved structure of the PFS installation sleeve of the present utility model;

[0067] Figure 26 Schematic diagram of the improved structure of the excitation sleeve of the present utility model;

[0068] Figure 27 is Figure 26 Internal structure schematic diagram;

[0069] Figure 28 Internal structure schematic diagram of the medicine cartridge pre-assembly of the present utility model;

[0070] Figure 29 Schematic diagram of removing the pen cap base;

[0071] Figure 30 Overall structure schematic diagram of the second embodiment of the medicine cartridge pre-assembly of the present utility model;

[0072] Figure 31 Internal structure schematic diagram of the second embodiment of the medicine cartridge pre-assembly of the present utility model;

[0073] Figure 32 Overall structure schematic diagram of the function pre-assembly of the two-stage embodiment of the auto-injector pen;

[0074] Figure 33 Structure schematic diagram of the two-stage embodiment of the auto-injector pen in the unused state;

[0075] Figure 34 Schematic diagram of removing the pen cap base of the two-stage embodiment of the auto-injector pen. Detailed description of the specific implementation

[0076] The following further details the specific implementation of the present utility model in conjunction with the accompanying drawings.

[0077] As Figure 3 , Figure 4 shown, the auto-injection device of the present utility model mainly includes a medicine cartridge pre-assembly 2, a function pre-assembly 3, and a top cover 4, which are delivered to the pharmaceutical manufacturer in a state of three parts of components, and then assembled with the pre-filled syringe 1. First, the pre-filled syringe 1 is inserted into the medicine cartridge pre-assembly 2 and fixed to form the state as Figure 4 shown, then the function pre-assembly 3 is inserted, and finally the top cover 4 is covered, thus forming the auto-injector pen of the present utility model.

[0078] The medicine cartridge pre-assembly 2, as Figure 5 ,Figure 6 , Figure 7 As shown, it is mainly formed by pre-assembling an outer sleeve 21, a PFS installation sleeve 22, an excitation sleeve 23, and a pen cap base 24.

[0079] The outer sleeve 21 is a hollow cylinder with openings at both ends for loading parts; an excitation sleeve 23 is installed in the outer sleeve 21; a PFS mounting sleeve 22 is nested in the excitation sleeve 23; a cavity is provided in the PFS mounting sleeve 22 for mounting and fixing the prefilled syringe 1; a pen cap base 24 is connected and installed at the bottom of the excitation sleeve 23.

[0080] The specific structure of the outer sleeve 21 can be referred to Figure 8 , Figure 9 , provided with a hollow cylindrical wall 211, both ends of the hollow cylindrical wall 211 are provided with openings, and a accommodating cavity 212 is formed inside; a sliding guide groove 213 is provided in the middle and lower part of the hollow cylindrical wall 211, which is used to connect the excitation sleeve 23, so that the excitation sleeve 23 is installed in the outer sleeve 21, and can slide along the sliding guide groove 213; a spring buckle 214 and a supporting buckle 215 are provided in the middle and upper part of the hollow cylindrical wall 211, and the spring buckle 214 and the supporting buckle 215 both protrude toward the inner side of the accommodating cavity 212, and the inner convex part of the spring buckle 214 and the inner convex part of the supporting buckle 215 are arranged at intervals, and a limiting groove 216 is formed between the two, which is used to install and fix the functional pre-assembly 3; a card slot 217 is provided at the top of the hollow cylindrical wall 211, which is used to install and fix the top cover 4.

[0081] For the specific structure of the PFS installation sleeve 22, please refer to Figures 10 - 13 , with a cylindrical wall 221, the interior of which is a cylindrical cavity 222, for storing the syringe 11 of the prefilled syringe 1, such as Figure 13 As shown, the syringe 11 is installed exactly in the cylindrical cavity 222.

[0082] A flange support 223 is provided above the cylindrical wall 221, and a plurality of flange claws 224 are provided above the flange support 223. The top of the flange claws 224 is provided with an inward limiting hook 225, and a clearance portion 226 is formed between the flange claws 224, so that the flange claws 224 can be forced to open outward, so that the limiting hooks 225 are opened, and then automatically reset under the action of the elastic deformation force of the material; and the clearance portion 226 also forms a channel between the flange claws 224. Figure 12 , Figure 13As shown, the size of the flange 13 of the prefilled syringe 1 is larger than the inner diameter of the limiting portion formed by the limiting hook 225, but smaller than the inner diameter of the limiting portion formed by the flange claw 224. Therefore, after the prefilled syringe 1 inserts the syringe 11 into the cylindrical cavity 222, it continues to move downward, and the flange 13 pushes the limiting hook 225, so that the flange claw 224 opens outward, and the flange 13 passes over the limiting hook 225 and enters the limiting cavity formed by the flange claw 224, that is, the installation of the prefilled syringe 1 in the PFS installation sleeve 22 is completed; the lower part of the flange 13 is limited by the flange support 223, and the upper part of the flange 13 is limited by the limiting hook 225. After the prefilled syringe 1 is installed in place in the PFS installation sleeve 22, there is an installation space between the upper part of the flange 13 and the lower part of the limiting hook 225, which is used to install the parts of the functional pre-assembly 3.

[0083] Furthermore, the bottom of the cylindrical wall 221 is formed inwardly to form a shoulder support 227, such as Figure 13 As shown, the shoulder support 227 can just support the shoulder 17 of the prefilled syringe 1; further, two or more elastic grooves 228 are provided below the cylindrical wall 221, so that the lower part of the cylindrical wall 221 can be elastically deformed; the length of the cylindrical wall 221 is slightly shorter than the length of the syringe 11, so after the prefilled syringe 1 is installed in place in the PFS mounting sleeve 22, the shoulder 17 of the prefilled syringe 1 is supported on the shoulder support 227, and the flange 13 has a certain gap from the plane of the flange support 223, so that a certain longitudinal buffer is formed between the prefilled syringe 1 and the PFS mounting sleeve 22. When a downward impact force is applied to the prefilled syringe 1, the shoulder 17 of the prefilled syringe 1 will squeeze the shoulder support 227, so that the shoulder support 227 opens outward to absorb the impact force and form a buffer. Of course, a buffer, such as a rubber pad, can also be provided between the flange 13 and the plane of the flange support 223 to absorb the impact force and form a buffer.

[0084] The specific structure of the excitation sleeve 23 can be referred to Figure 14 , Figure 15 , a sleeve wall 231 is provided, in which a sleeve cavity 232 is formed for accommodating the PFS installation sleeve 22; the sleeve wall 231 extends upward to form a plurality of excitation push pieces 233, and the excitation push pieces 233 pass through the concession portions 226 between the flange claws 224 of the PFS installation sleeve 22; concession portions 234 are also formed between the excitation push pieces 233 for accommodating the flange claws 224. A plurality of claws 235 are provided at the top of the sleeve wall 231, and the tops of the claws 235 extend outward to form a hook body 236; the excitation sleeve 23 is installed upward from the bottom of the outer sleeve 21, and the hook body 236 is squeezed by the hollow cylinder wall 211, and the claws 235 shrink inward until the hook body 236 reaches the sliding guide groove 213, and the claws 235 are automatically reset by the elastic force, so that the hook body 236 is stuck in the sliding guide groove 213, as shown in FIG. Figure 7As shown, the hook body 236 and the sliding guide groove 213 form a sliding guide structure, so that the excitation sleeve 23 can slide up and down in the outer sleeve 21.

[0085] An excitation abutment 237 is formed at the bottom of the excitation sleeve 23, and a through hole 238 is provided in the middle of the excitation abutment 237 for the needle 14 of the filling syringe 1 and the pen cap holder in the middle of the pen cap base 24 to pass through; a plurality of card slots 239 are provided on the excitation abutment 237 for docking with the pen cap base 24 to fix the pen cap base 24 to the bottom of the excitation sleeve 23.

[0086] The specific structure of the pen cap base 24 can be referred to Figure 16 , Figure 17 , a base wall 241 is provided. As shown in the figure, the base wall 241 is cylindrical, and its diameter and wall thickness match those of the outer sleeve 21, and can be against the bottom of the outer sleeve 21; a pen cap holder 242 is provided on the inner side of the base wall 241, and the upper part of the pen cap holder 242 is grooved to form an elastic wall structure, and the top of the pen cap holder 242 extends inward to form a claw 243, and the size of the pen cap holder 242 and the claw 243 matches the protective cap 16 of the filling syringe 1, as shown in FIG. Figure 18 , Figure 19 As shown, during assembly, the pen cap base 24 is pushed upward so that the protective cap 16 is aligned with the pen cap holder 242 and passes over the claws 243 to completely enter the pen cap holder 242. The claws 243 are stuck on the top of the protective cap 16 and are located below the shoulder 17. Furthermore, a stopper 245 is provided at the bottom of the pen cap holder 242 to support the bottom of the protective cap 16 to prevent the protective cap 16 from falling off from the pen cap holder 242.

[0087] The pen cap holder 242 is connected to the base wall 241 through a bottom holder 246. A plurality of buckles 247 are provided on the outer side of the lower portion of the pen cap holder 242. The size of the buckles 247 matches the size of the card slot 239. Figure 7 , Figure 20 As shown in the figure, when the pen cap base 24 is installed on the bottom of the excitation sleeve 23, the pen cap support 242 is passed through the through hole 238, and the buckle 247 is aligned with the slot 239, so that the buckle passes over the slot 239 and reaches the top of the excitation abutment 237, and then the pen cap base 24 is rotated to make the buckle 247 away from the slot 239. The pen cap base 24 is clamped on the bottom of the excitation sleeve 23 and cannot be separated longitudinally. Figure 7 As shown, at this time, the top of the base wall 241 of the pen cap base 24 also just butts against the bottom of the outer sleeve 21, so that the excitation sleeve 23 and the pen cap base 24 are longitudinally locked on the outer sleeve 21 together.

[0088] Preferably, the buckle 247 is provided with a bevel in the height direction, and / or the excitation abutment portion 237 is provided with a bevel near the slot 239, so that when the pen cap base 24 is rotated and clamped on the bottom of the excitation sleeve 23, as it rotates, the contact part becomes thicker in the height direction along with the bevel, generating a certain longitudinal extrusion force, so that the pen cap base 24 can be fully clamped on the bottom of the excitation sleeve 23.

[0089] The excitation sleeve 23 and the pen cap base 24 can also be connected by a connection structure of a clamping ring and a clamping groove. A clamping ring or a clamping groove is provided at the bottom of the sleeve wall 231 of the excitation sleeve 23, and a matching clamping groove or a clamping ring is provided on the inner side of the base wall 241 of the pen cap base 24. The clamping ring and the clamping groove are connected to install the pen cap base 24 on the excitation sleeve 23 to achieve locking. Preferably, as Figures 21 - 23 As shown, a raised snap ring 2392 is provided at the bottom of the sleeve wall 231 of the excitation sleeve 23, and a slot 249 matching the snap ring 2392 is provided on the inner side of the base wall 241 of the cap base 24. The cap base 24 is mounted on the excitation sleeve 23 by snapping the snap ring 2392 into the slot 249. When in use, the cap base 24 can be pulled off the excitation sleeve 23 by applying a longitudinal force. In the illustrated scheme, the snap ring 2392 protrudes from the sleeve wall 231 and can also limit the upward movement of the sleeve wall 231. During the upward movement of the excitation sleeve 23, the snap ring 2392 abuts against the bottom of the hollow cylinder wall 211 of the outer sleeve 21, which can prevent the excitation sleeve 23 from further retracting into the outer sleeve 21.

[0090] Medicine chamber pre-assembly 2 Figure 6 Assemble in the manner of Figure 5 The PFS mounting sleeve 22 is delivered to the pharmaceutical manufacturer in the form of a package and assembled with the filling syringe 1; the PFS mounting sleeve 22 is first installed into the outer sleeve 21, or the PFS mounting sleeve 22 is first combined with the excitation sleeve 23 and then installed into the outer sleeve 21, so that the hook body 236 is stuck in the sliding guide groove 213; then the pen cap base 24 is installed and tightened, so that the excitation sleeve 23 and the pen cap base 24 are longitudinally locked on the outer sleeve 21 together; at this time, the PFS mounting sleeve 22 can slide up and down in the excitation sleeve 23 and the outer sleeve 21, and is not fully limited, but the top of the flange claw 224 of the PFS mounting sleeve 22 is just aligned with the support buckle 215, and is longitudinally limited by the support buckle 215, and cannot be removed from the outer sleeve 21.

[0091] like Figure 7As shown, the snap fastener 214 and the support fastener 215 are also arranged at intervals, forming a channel therebetween for the firing push piece 233 of the firing sleeve 23 to pass through. The cooperation between the hook body 236 and the sliding guide groove 213, as well as the cooperation between the snap fastener 214, the support fastener 215, the flange spring claw 224 and the relief portion 226 and the firing push piece 233, enables a longitudinal movement guide to be formed between the firing sleeve 23 and the outer sleeve 21, preventing relative axial rotation. Therefore, the pen cap base 24 can be conveniently fixed to the bottom of the firing sleeve 23 by a rotational movement.

[0092] The above is the basic mechanism composition of the medicine storage pre-assembly 2 of the present utility model. Further, as Figures 24 - 28 shown, local structures of the outer sleeve 21, the PFS mounting sleeve 22, the firing sleeve 23, and the pen cap base 24 can be improved.

[0093] As Figure 24 shown, a long strip-shaped observation window 219 is provided at the lower part of the hollow cylinder wall 211 of the outer sleeve 21; since the outer sleeve 21 is located on the outermost side and generally needs to print medicine information and is covered with a plastic-sealed sleeve, the observation window 219 needs to be specially provided, and at the same time, the plastic-sealed sleeve remains transparent or hollowed out here, so as to facilitate observing the pre-filled syringe 1 from the outside and understanding the injection situation of the medicine.

[0094] As Figure 24 shown, the upper part of the hollow cylinder wall 211 of the outer sleeve 21 can be lengthened, so that the top cover 4 is embedded and installed at the top of the hollow cylinder wall 211, making the appearance more concise. Further, a limiting convex block 218 can be provided on the inner side of the top of the hollow cylinder wall 211 for further limiting the top cover 4.

[0095] As Figure 25 shown, on the outer side of the middle part of the cylindrical wall 221 of the PFS mounting sleeve 22, a guiding wing 229 is provided. The guiding wing 229 is a long strip plate protruding outwards, and the long strip plates are arranged parallel to the axis direction.

[0096] Correspondingly, as Figure 26 、 Figure 27 shown, on the inner side of the sleeve wall 231 of the firing sleeve 23, a guiding plate 2310 is provided. The guiding plate 2310 is provided in a group of 2, protruding on the inner side of the sleeve wall 231, and a guiding groove 2311 parallel to the axis direction is formed between the two guiding plates 2310 in a group.

[0097] The guiding groove 2311 matches with the guiding wing 229 to form a linear movement guide along the axis direction, enabling the PFS mounting sleeve 22 to linearly move in the firing sleeve 23 under the guidance of the linear movement guide.

[0098] Further, as Figure 28As shown, the outer wall of the guide wing 229 abuts against the inner surface of the sleeve wall 231 of the excitation sleeve 23, that is, the bottom of the guide groove 2311; preferably, two groups of guide wings 229, guide plates 2310, and guide grooves 2311 are provided, and are symmetrically arranged along the axis, so that when the PFS mounting sleeve 22 performs a linear motion relative to the excitation sleeve 23, it can be sufficiently limited to avoid swinging, and can drive the prefilled syringe 1 to perform a stable needle-piercing movement.

[0099] Further, if Figure 23 , Figure 27 , Figure 28 As shown, the triggering abutment portion 237 is provided with a plurality of positioning grooves 2394 (positions are similar to the card grooves 239 ), and the bottom of the cap holder 242 of the corresponding cap base 24 protrudes outward to form positioning blocks 2422 . The positioning blocks 2422 match the positioning grooves 2394 .

[0100] like Figure 26 , Figure 27 As shown, when the sleeve wall 231 of the excitation sleeve 23 adopts a raised clamping ring structure design, a raised clamping strip 2393 structure can also be adopted, that is, the clamping ring 2392 is discontinuous, and the same clamping effect can be achieved.

[0101] As the pen cap base 24 is installed on the excitation sleeve 23, the positioning block 2422 is inserted into the positioning groove 2394, so that the pen cap base 24 cannot rotate freely; further, the clamping strip 2393 is inserted into the clamping groove 249 to achieve locking; at this time, the top of the base wall 241 of the pen cap base 24 also just rests against the bottom of the outer sleeve 21, so that the excitation sleeve 23, the pen cap base 24 and the outer sleeve 21 are locked in the longitudinal position together.

[0102] like Figure 24 , Figure 26 , Figure 27 , Figure 28 As shown, the width of the sliding guide groove 213, the spring claw 235, and the hook body 236 can be appropriately narrowed, so that when the hollow cylinder wall 211 of the outer sleeve 21 is covered with a plastic sleeve, the plastic sleeve shrinks by heat, or sticks to the hollow cylinder wall 211, which can also reduce the contact area between the plastic sleeve and the hook body 236, avoiding the plastic sleeve from generating excessive resistance to the movement of the hook body 236.

[0103] After the automatic injection pen is assembled, when it is used, the pen cap base 24 needs to be removed, and the protective cap 16 will be removed together. Figure 29 As shown; at this time, the exciting abutment portion 237 at the bottom of the exciting sleeve 23 is exposed for abutment for exciting.

[0104] like Figures 30 - 34As shown, another embodiment of the automatic injection pen of the present utility model is given, namely the two-stage embodiment, which is delivered in the state of 2 parts of components, namely the medicine cartridge pre-assembly 2` and the function pre-assembly 3`.

[0105] The main difference is that the medicine cartridge pre-assembly 2` no longer includes the outer sleeve 21, that is, it is formed by pre-assembling the PFS installation sleeve 22, the firing sleeve 23, and the pen cap base 24 together. Preferably, the length of the base wall 241 of the pen cap base 24 can be appropriately lengthened to wrap the lower part of the firing sleeve 23. Preferably, the bottom of the pen cap base 24 extends outward to form a square base 240.

[0106] For the function pre-assembly 3`, an outer cylinder 301 and a cover 302 are added; among them, the outer cylinder 301 is equivalent to the outer sleeve 21, and the cover 302 is equivalent to the top cover 4; the outer cylinder 301 and the cover 302 are pre-connected together to form a cylinder, or the outer cylinder 301 and the cover 302 can also be pre-fabricated into an integral cylinder; the function pre-assembly 3 is assembled separately and then pre-installed in the cylinder to form the function pre-assembly 3`.

[0107] Then, it is delivered to the pharmaceutical manufacturer in the state of 2 components, namely the medicine cartridge pre-assembly 2` and the function pre-assembly 3`; after the pharmaceutical manufacturer fills the syringe with the liquid medicine, a pre-filled syringe 1 is formed; finally, the pre-filled syringe 1 is assembled with the medicine cartridge pre-assembly 2` and the function pre-assembly 3` together to form the automatic injection pen of the present utility model. The steps are roughly as follows:

[0108] Step 1: The pre-filled syringe 1 is inserted into the medicine cartridge pre-assembly 2`; in particular, the flange 13 of the pre-filled syringe 1 is snapped into the installation cavity formed by the flange spring claws 224, and the shoulder 17 abuts against the shoulder support 227, and the protective cap 16 is inserted into the pen cap holder 242 of the pen cap base 24 and is hooked by the pulling claw 243.

[0109] Step 2: The function pre-assembly 3` is inserted into the combination in Step 1; the spring claws 235 of the firing sleeve 23 contract inward until the hook body 236 reaches the sliding guide groove 213`, and the spring claws 235 are automatically reset by the elastic force, so that the hook body 236 is snapped into the sliding guide groove 213`. The hook body 236 and the sliding guide groove 213` form a sliding guiding structure, so that the firing sleeve 23 is installed in the outer cylinder 301 and the firing sleeve 23 can slide up and down relative to the outer cylinder 301. The combined state is as Figure 33 shown. At this time, the positions of each component are locked, with strong anti-drop performance and not easily triggered, and can be stored or transported, and finally delivered to the terminal for use.

[0110] When the automatic injection pen of the present utility model is used, it can be like Figure 33The finished product shown is taken out of the storage container; the square base 240 design is adopted, which can prevent the automatic injection pen from rolling; and the square base 240 can more reliably make the automatic injection pen of the present utility model stand on the table.

[0111] When finally using for drug injection, first remove the pen cap base 24 together with the protective cap 16 to form as Figure 34 ; then grasp the outer cylinder 301, press the activation abutting part 237 against the injection site to be injected, and then continue to apply a downward force to the outer cylinder 301, first making other components move downward along with the outer cylinder 301, the needle 14 passes through the through hole 238 and pierces into the skin of the injection site to be injected, and then the use begins.

[0112] The preferred embodiments of the present utility model have been specifically described above, but the present utility model is not limited to the described embodiments. Those skilled in the art can also make various equivalent modifications or substitutions without departing from the spirit of the present utility model, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. Auto-injector pen drug cartridge pre-assembly, characterized in that, It is formed by pre-assembling a PFS installation sleeve, an activation sleeve, and a pen cap base together; The installation sleeve is nested and installed inside the activation sleeve; A cavity is provided inside the PFS installation sleeve for installing and fixing a pre-filled syringe; The bottom of the activation sleeve or the outer sleeve is connected and installed with a pen cap base.

2. The pre-assembly of the drug cartridge for an auto-injector pen according to claim 1, wherein, It further includes an outer sleeve; The outer sleeve is provided with a hollow barrel wall, both ends of the hollow barrel wall are provided with openings, and an accommodation cavity is formed inside; A sliding guide groove is provided in the middle and lower part of the hollow barrel wall for connecting the activation sleeve. The activation sleeve is installed inside the outer sleeve and can slide along the sliding guide groove.

3. The pre-assembly of the drug cartridge for an auto-injector pen according to claim 1, wherein, The lower part of the PFS installation sleeve is an accommodation cavity for storing the syringe of the pre-filled syringe; The upper part of the PFS installation sleeve is an accommodation cavity for storing the flange of the pre-filled syringe; Between the accommodation cavity at the lower part and the accommodation cavity at the upper part of the PFS installation sleeve is a flange support.

4. The pre-assembly of the drug cartridge for an auto-injector pen according to claim 3, wherein Several flange spring claws are provided above the flange support, and inward limiting hooks are provided at the tops of the flange spring claws; The flange spring claws and the limiting hooks are separated by a relief portion, and the relief portion forms a channel for the activation push piece of the activation sleeve to pass through.

5. The pre-assembly of the drug cartridge for an auto-injector pen according to claim 3, wherein The bottom of the accommodation cavity at the lower part of the PFS installation sleeve shrinks inward to form a shoulder support; The shoulder of the syringe of the pre-filled syringe abuts against the inner side of the shoulder support.

6. The pre-assembly of the drug cartridge for an auto-injector pen according to claim 5, wherein, An elastic groove is provided at the shoulder support, and the free end of the shoulder support can elastically open outward.

7. The pre-component of the drug cartridge for an auto-injector pen according to claim 1, wherein The activation sleeve is provided with a sleeve wall, and inside it is a sleeve cavity for accommodating the PFS installation sleeve; The sleeve wall extends upward to form several activation push pieces; The activation push pieces freely pass through the PFS installation sleeve; At the top of the sleeve wall, below the activation push pieces, several installation claws are provided, and the activation sleeve is installed inside the outer sleeve through the installation claws.

8. The pre-assembly of the drug cartridge for an auto-injector pen according to claim 7, characterized in that, The installation claws are spring claws, and the tops of the spring claws extend outward to form hook bodies; The spring claws can elastically deform inward, driving the hook bodies to move inward; The hook bodies are installed in the sliding guide grooves of the outer sleeve, and the hook bodies and the sliding guide grooves form a sliding guide.

9. The pre-assembly of the drug cartridge for an auto-injector pen according to claim 8, characterized in that, The bottom of the activation sleeve extends inward to form an activation abutting portion, and a through hole is provided in the middle of the activation abutting portion for the needle of the pre-filled syringe, the protective cap, and the pen cap support in the middle of the pen cap base to pass through.

10. The pre-assembly of the drug cartridge for an auto-injector pen according to claim 1, characterized in that, The pen cap base is provided with a base wall, and the base wall abuts against the bottom of the outer sleeve; A pen cap support is provided on the inner side of the base wall. The upper part of the pen cap support is grooved to form an elastic wall structure; the top of the pen cap support extends inward to form a pulling claw; the pen cap support, the pulling claw match the protective cap of the pre-filled syringe; The pen cap base is detachably connected to the activation sleeve.

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