CN221411887U - Needle cylinder bin structure and automatic injector - Google Patents

Abstract

The application provides a needle cylinder bin structure, which comprises: the first bin body is provided with first threads on the outer surface; a second bin coupled with the first bin such that an interior space defined by the first bin and the second bin can secure a barrel of a pre-filled syringe; the inner surface of the protecting cover is provided with a second thread matched with the first thread, so that the protecting cover is in threaded connection with the first bin body; a protective tube rotatably coupled with the protective cover and provided with a first claw configured to be capable of catching a protective cap of the prefilled syringe; when the protecting cover moves spirally relative to the first bin body and is far away from the first bin body, the protecting cover drives the protecting pipe to move linearly, and meanwhile, the first clamping jaw drives the protecting cap to move linearly so that the protecting cap is separated from the pre-filling and sealing injection needle cylinder. The application also provides an automatic injector comprising the syringe bin structure. According to the application, the integrated cap taking and accurate and safe injection can be realized.

Description

Needle cylinder bin structure and automatic injector

Technical Field

The application relates to the field of medical equipment, in particular to a needle cylinder bin structure and an automatic injector comprising the same.

Background

To meet the need for periodic or long-term self-injection of drugs during home treatment of chronic diseases, pre-filled syringe cartridges and corresponding autoinjectors have been developed for self-injection.

In pre-filled syringes, to prevent spillage of the medical fluid and maintain sterility of the medical fluid and to prevent accidental contact of the needle with the user, the needle of the pre-filled syringe is typically covered by a protective cap (e.g., a silicone cap) and is removed only upon injection. In addition, since the prefilled syringe is installed in the needle silo structure, and the needle silo structure is further provided with a protecting cover for protecting the prefilled syringe, the protecting cover of the needle silo structure needs to be removed firstly when in use. Therefore, in existing autoinjectors, two operations need to be completed prior to injection: removing the protective cover and removing the protective cap. Typically, these two operations are accomplished in two steps, and are therefore not sufficiently convenient and are prone to contamination risks.

In view of the above, the cartridge structure of the existing automatic injector, in which the protective cover and the protective cap can be removed together through one step, is usually in a direct pulling or screwing manner. The direct pulling mode is laborious, while the screwing mode is easy to twist the needle head, and the internal scraps of the protective cap are easy to enter the needle head, so that the needle head is blocked or polluted.

In addition, when a patient performs self-injection using an existing automatic injector, there is often a fear of needle, and there is difficulty in controlling injection depth, direction, trigger time, and the like.

Accordingly, improvements to existing syringe cartridge configurations and auto-injectors are desired.

Disclosure of utility model

It is an object of the present application to provide an improved syringe barrel structure and an automatic injector including the same that address at least one of the problems of the prior art.

To this end, according to an aspect of the present application, there is provided a syringe cartridge structure for accommodating a prefilled injection syringe, the syringe cartridge structure comprising: the first bin body is provided with first threads on the outer surface; a second cartridge body coupled with the first cartridge body such that an interior space defined by the first cartridge body and the second cartridge body can accommodate a barrel of the pre-filled injection syringe; the inner surface of the protecting cover is provided with a second thread matched with the first thread, so that the protecting cover is in threaded connection with the first bin body; a protective tube rotatably coupled with the protective cover and provided with a first claw configured to be able to catch a protective cap of the pre-filled syringe; when the protecting cover moves spirally relative to the first bin body and is far away from the first bin body, the protecting cover drives the protecting pipe to move linearly, and meanwhile, the first clamping jaw drives the protecting cap to move linearly so that the protecting cap is separated from the pre-filling and sealing injection needle cylinder.

According to an embodiment of the application, the protective cover comprises an end plate and a side wall extending from the end plate, the second thread is provided on an inner surface of the side wall, and the first end of the protective tube is rotatably coupled with the end plate, and the first claw is provided at the second end of the protective tube.

According to an embodiment of the application, one of the end plate and the first end of the protective tube is provided with a protrusion, and the other of the end plate and the first end of the protective tube is provided with a groove, the protrusion fitting within the groove such that the protrusion can rotate along the groove but is not separated from the groove.

According to an embodiment of the application, the end plate has a central bore, and the first end of the protective tube is rotatably coupled to an inner wall of the central bore.

According to an embodiment of the application, a shield stop guide is provided on the outer surface of the shield, which is configured to be directly or indirectly limited by a cartridge stop guide on the inner surface of the first cartridge body to prevent rotation of the shield.

According to an embodiment of the application, the protective tube is provided with a plurality of first claws, and the first claws are uniformly distributed along the circumferential direction.

According to an embodiment of the present application, a second claw is provided at an end of the second bin body, which is far away from the first bin body, and the second claw is configured to abut against the cylinder body of the pre-filled injection syringe, so that the pre-filled injection syringe is clamped in the inner space.

According to an embodiment of the application, the second catch is configured to lock a flange of a barrel of the pre-filled syringe.

According to an embodiment of the present application, the syringe cartridge structure further comprises a sheath surrounded by the first cartridge body and the protective tube is surrounded by the sheath, and an elastic member disposed between the second cartridge body and the sheath, a first end of the sheath contacting the elastic member to receive an elastic force such that the sheath abuts against a first stopper of the first cartridge body and a second end of the sheath exceeds an end of a needle of the pre-filled injection syringe.

According to an embodiment of the application, the sheath is provided on its outer surface with a sheath outer stop guide in contact with a cartridge body stop guide on the inner surface of the first cartridge body, and the sheath is provided on its inner surface with a sheath inner stop guide in contact with a sheath stop guide on the outer surface of the sheath, such that the sheath and the sheath remain non-rotating relative to the first cartridge body.

According to an embodiment of the application, the sheath comprises a trigger lever configured to extend beyond the second cartridge body by a set distance when the sheath is pushed by a force opposite to the spring force, and the second end of the sheath is retracted by the set distance.

According to an embodiment of the application, a plurality of uniformly distributed salient points are arranged on the end face of the second end of the sheath; and/or the radial thickness of the second end of the sheath is 0.8-1.5mm; and/or at least one of an inner chamfer and an outer chamfer of the second end of the sheath is less than 45 degrees; and/or the elastic force is set to 1 newton or more.

According to an embodiment of the application, the second cartridge body is provided with a second stop configured to prevent the sheath from moving when the sheath is pushed beyond the second cartridge body by a set distance.

According to another aspect of the present application, there is provided an automatic injector comprising: a syringe cartridge structure as described above; a prefilled syringe including a barrel for containing a medical fluid, a push rod for pushing the medical fluid, a needle for penetrating a patient, and a protective cap for protecting the needle, the prefilled syringe being mounted within the syringe barrel structure such that the push rod extends out of the syringe barrel structure, and the protective cap is caught by a first catch of a protective tube of the syringe barrel structure; and a host including a drive mechanism configured to be able to push the push rod.

According to an embodiment of the application, the auto-injector includes a coupling trigger sensor configured to generate a signal that allows the auto-injector to continue with subsequent actions when the syringe cartridge structure is properly coupled.

According to an embodiment of the application, the automatic injector includes an injection trigger switch configured to be triggered to allow the drive mechanism to push the push rod only when a trigger lever of a sheath of the syringe cartridge structure is moved a set distance.

The needle cylinder bin structure and the automatic injector can realize the following technical effects:

1. The protecting cover of the needle cylinder bin structure and the protecting cap of the prefilled injection needle cylinder are simultaneously taken down through one step, so that the integral cap is removed;

2. The protective cap is pulled out in a straight line through the rapid rotation of the protective cover, so that the problems of inconvenience and labor saving in a direct pulling mode are solved, and the problem that a needle is blocked and polluted by scraps of the protective cap can be avoided;

3. by arranging the movable sheath, the needle head can be hidden in the whole process, and the needle fear of a patient is eliminated;

4. The pressure distribution of the injection part of a patient can be improved through bump design of the end face of the sheath, thickness setting of the sheath, chamfer design of the sheath, threshold setting of the elastic element and the like, pain transfer is realized through pressure dispersion, and pain and needle fear of the patient are relieved;

5. By providing a syringe cartridge structure that is removably coupled to a host of an auto-injector, the syringe cartridge structure can be changed according to the type and specification of the pre-filled injection syringe so that the same host of the auto-injector can accommodate different types of pre-filled injection syringes and matched syringe cartridge structures;

6. Can prevent to trigger by mistake, realize accurate, safe injection:

When the host computer of the automatic injector is correctly connected with the syringe bin structure and the movable sheath is compressed to a set distance, the connection triggering sensor is triggered to allow injection, so that false triggering before injection is prevented;

The syringe bin structure adopts push-type filling, and after the pre-filled injection syringe is filled, the syringe bin structure is clamped by the clamping jaw and cannot be taken out at will, so that the flange of the syringe body is locked, the position of the syringe body is fixed, and the problem of accurate control in the process of pushing liquid is realized;

Because barrel and syringe needle are fixed, and the sheath receives the restriction of elastic component and backstop portion, only exposes the injection degree of depth of settlement after the sheath is pressed, realizes accurate injection degree of depth, and the push rod only accomplishes the push away liquid, does not influence injection degree of depth, prevents simultaneously that the syringe needle from changing the direction because of external force.

Drawings

Exemplary embodiments of the present application will be described in detail below with reference to the attached drawings, and it should be understood that the embodiments described below are only for explaining the present application, not limiting the scope of the present application, and wherein:

FIG. 1 is a schematic front view of an auto-injector equipped with a needle silo structure according to an exemplary embodiment of the application;

FIG. 2 is a schematic, fragmentary view of the automatic injector shown in FIG. 1 with the needle silo structure removed;

FIG. 3 is a schematic cross-sectional view of a prefilled syringe for use in the syringe cartridge structure shown in FIG. 1;

Fig. 4, 5, 6, 7 and 8 schematically illustrate perspective, front, top, rear and left side views, respectively, of the syringe cartridge structure illustrated in fig. 1;

fig. 9 is a schematic exploded view of the syringe cartridge structure shown in fig. 4;

FIGS. 10 and 11 are schematic cross-sectional views taken along lines I-I 'and II-II' of FIG. 8, respectively;

FIGS. 12, 13 and 14 are front, side and top views, respectively, of a cap removal mechanism formed by the protective cover and the protective tube shown in FIG. 9;

FIG. 15 is a schematic cross-sectional view taken along line III-III' in FIG. 14;

FIG. 16 is a schematic perspective view showing the assembly of the cap removal mechanism and pre-filled syringe shown in FIGS. 12-15;

FIG. 17 is a schematic cross-sectional view of the assembly shown in FIG. 16;

FIG. 18 is a schematic cross-sectional view of the syringe barrel structure shown in FIG. 4 filled with pre-filled injection syringes;

Fig. 19 is a schematic perspective view of the sheath shown in fig. 9;

Fig. 20 is a schematic cross-sectional perspective view of the syringe cartridge structure shown in fig. 18 in a loaded state;

Fig. 21 is a schematic cross-sectional perspective view of the syringe cartridge structure shown in fig. 18 in a capped condition.

Detailed Description

Preferred embodiments of the present application are described in detail below with reference to examples. Those skilled in the art will appreciate that these exemplary embodiments are not meant to be limiting in any way. Furthermore, features in embodiments of the application may be combined with each other without conflict. In the different drawings, the same components are denoted by the same reference numerals. Other components and steps are omitted from the figures for brevity, but this is not meant to indicate that the syringe barrel arrangements and auto-injectors of the present application may not include other components. It should be understood that the drawings are not to scale and that the size, relationship, number of parts in the drawings are not intended as limitations of the application.

The overall structure of an automatic injector and a pre-filled syringe for an automatic injector according to an exemplary embodiment of the present application will be briefly described with reference to fig. 1 to 3.

As shown in fig. 1, the auto-injector 500 of the present application includes a host 200 and a syringe cartridge structure 100, wherein a pre-filled syringe 70 (not shown in fig. 3, 1) may be housed within the syringe cartridge structure 100, and the host 200 may include a drive mechanism (not shown), e.g., a motor drive mechanism, capable of driving the push rod 72 of the pre-filled syringe 70. As shown in fig. 3, the prefilled syringe 70 may include a cylinder 71 for containing a medical fluid, a push rod 72 for pushing the medical fluid (an end of which may be provided with a silicone plug 76), a needle 74 for penetrating the patient, and a protective cap 75 (e.g., a silicone cap) for protecting the needle 74. Since the pre-filled syringe 70 is an existing product, it will not be described in further detail herein.

During use, the pre-filled injection syringe 70 is first installed within the needle silo structure 100, then the syringe silo structure 100 is installed onto the host 200, and the syringe silo structure 100 may be removed from the host 200 after the host 200 is started to complete an auto-injection, so that a new pre-filled injection syringe 70 or a new syringe silo structure 100 may be replaced for a subsequent auto-injection. Accordingly, the syringe silo structure 100 may also be referred to as a "magazine structure" in which the syringe silo structure 100 fills the host 200 with pre-filled syringe 70 in a manner similar to a "magazine". Accordingly, the syringe cartridge architecture 100 may be changed according to the model and specifications of the pre-filled injection syringe 70 to adapt the same host 200 of the auto-injector 500 to different models of pre-filled injection syringes 70 and matched syringe cartridge architectures 100. It should be noted that the pre-filled injection syringe 70 may be integrated with the syringe barrel structure 100 during manufacture such that a different syringe barrel structure 100 may be used for each injection without having to be self-assembled by the patient.

As shown in fig. 2, the auto-injector 500 may further include a protection cover 220, and the protection cover 220 is provided with a protection cover buckle 221 for corresponding to a host card slot (not shown) on the host 200, so that the protection cover 220 can be covered on the host 200 when the used syringe cartridge structure 100 is removed from the host 200, thereby protecting the host 200. Alternatively, a slot may be provided on the protective cover 220, and a catch may be provided on the host 200, so that the coupling between the protective cover 220 and the host 200 may be achieved. In addition, as shown in fig. 2, the host 200 may include a coupling trigger sensor 233, the coupling trigger sensor 233 being configured to generate a signal that allows the automatic injector 500 to continue with subsequent actions when the host 200 is properly coupled with the syringe cartridge structure 100. For example, the coupling trigger sensor 233 may be a spring-supported contact switch, with the contacts of the coupling trigger sensor 233 being pressed by corresponding portions (e.g., recesses 29 shown in fig. 4 and 1) on the syringe cartridge structure 100 when the syringe cartridge structure 100 is coupled with the host 200.

Further details regarding the auto-injector 500 and its host 200 will be provided below in connection with the description of the syringe cartridge structure 100. A syringe cartridge structure 100 according to an exemplary embodiment of the present application is described in detail below with reference to fig. 4 through 11.

As shown in fig. 4 to 8, the structure of the syringe cartridge structure 100 of the present application may include a first cartridge body 10 and a second cartridge body 20, wherein the first cartridge body 10 is provided with a cartridge body buckle 11, and the cartridge body buckle 11 can be detachably matched with a housing clamping groove on the housing 210 of the host 200 to fix the syringe cartridge structure 100 when the syringe cartridge structure 100 is inserted into the housing 210 of the host 200. Accordingly, the protective cover buckle 221 has a shape similar to the cartridge body buckle 11, so that the protective cover 220 can be covered on the host 200 after the used syringe cartridge structure 100 is removed from the host 200, thereby protecting the internal components of the host 200. It should be noted that the cartridge body clasp 11 may also be provided on the second cartridge body 20. Alternatively, a cartridge card slot may be provided on the first cartridge 10 or the second cartridge 20, and a corresponding housing buckle may be provided on the housing 210, so that the syringe cartridge structure 100 and the host 200 may be coupled.

As shown in fig. 4 to 8, the syringe cartridge structure 100 may further include a protecting cover 30 and a protecting tube 40, wherein the first cartridge body 10 is positioned between the second cartridge body 20 and the protecting cover 30, and the protecting tube 40 is surrounded by the protecting cover 30. As shown in fig. 9 to 11, the outer surface of the first cartridge body 10 is provided with first threads 13. The second cartridge body 20 is coupled with the first cartridge body 10 such that the interior space 26 defined by the first cartridge body 10 and the second cartridge body 20 is capable of receiving a barrel 71 of the pre-filled injection syringe 70. The inner surface of the protecting cover 30 is provided with a second screw thread 33 adapted to the first screw thread 13 so that the protecting cover 30 is screw-coupled with the first cartridge body 10. Specifically, the protective cover 30 includes an end plate 31 and a side wall 32 extending from the end plate 31, and the second screw 33 is provided on an inner surface of the side wall 32. The shield 40 is rotatably coupled with the shield 30, and the shield 40 is provided with a first jaw 43, the first jaw 43 being configured to capture a shield 75 of the pre-filled syringe 70. Specifically, a first end 41 of the guard tube (40) is rotatably coupled with the end plate 31, and a first jaw is disposed at a second end 42 of the guard tube 40 opposite the first end 41. When the protecting cover 30 moves spirally relative to the first bin 10 and moves away from the first bin 10, the protecting cover 30 drives the protecting tube 40 to move linearly, and the first claw 43 drives the protecting cap 75 to move linearly, so that the protecting cap 75 is separated from the pre-filled and sealed injection syringe 70.

Therefore, the cartridge case structure 100 of the present application can be easily rotated to remove the cap just like a cap of a mineral water bottle, and can be directly pulled out. Therefore, the protecting cover of the needle cylinder bin structure and the protecting cap of the pre-filled injection needle cylinder can be simultaneously taken down through one step, so that the integral cap removal is realized. In addition, the problem that the direct pulling mode of the protective cap is not convenient and laborious is solved, and the problems that the needle is easy to skew and is easy to be blocked and polluted by scraps of the protective cap due to the screwing mode of the protective cap are avoided.

The mechanism formed by the protective cover 30 and the protective tube 40 (which may also be referred to as a "cap removal mechanism" since its primary function is to remove the protective cap 75) is described in further detail below with reference to fig. 12-17. As shown in fig. 12-15, to provide a rotatable coupling between the protective cover 30 and the protective tube 40, a groove 44 may be provided on the first end 41 of the protective tube 30 by providing a protrusion 34 on the end plate 31 such that the protrusion 34 can rotate along the groove 44 but is not separated from the groove 44, thereby forming a rotatable coupling. Preferably, the sliding coefficient between the groove 44 on the first end 41 of the protective tube 30 and the protrusion 34 on the protective cover 30 should be reduced as much as possible to minimize friction therebetween. Thus, the protective cover 30 can be rotated relative to the protective tube 40, but the protective tube 40 is kept from rotating, so that the screwing action of the protective cover 30 and the direct pulling action of the protective tube 40 driving the protective cap 75 can be simultaneously realized. It should be noted that the same action and effect can be achieved as long as one of the end plate 31 and the first end 41 of the protective tube 40 is provided with the protrusion 34, the other of the end plate 31 and the first end 41 of the protective tube 40 is provided with the groove 44, and the protrusion 31 is fitted in the groove 44 such that the protrusion 34 can rotate along the groove 44 without being separated from the groove 44. To facilitate coupling of the protective cover 30 and the protective tube 40, as shown in fig. 14 and 15, the end plate 31 may have a central hole (not shown) to the inner wall of which the first end 41 of the protective tube 40 is rotatably coupled. For example, the protective cover 30 and the protective tube 40 may be prepared separately and then the first end 41 of the protective tube 40 pressed into the central bore of the protective tube 30 to effect the mating of the protrusions 34 and the grooves 44. Of course, other ways of forming the rotatable coupling between the protective cover 30 and the protective tube 40 are possible, and the application is not limited to the above.

Generally, in the prefilled syringe 70, the cap 75 is tightly snapped onto the end of the barrel 71, so that there is a large friction between the cap 75 and the end of the barrel 71, while the friction generated by the rotatable coupling between the shield 30 and the shield tube 40 is small. When the protective cover 30 is rotated along the first screw thread 13 of the first cartridge body 10, the protective tube 40 may remain unrotated until the protective cap 75 is pulled linearly far enough from the end of the cylinder 71, limited by the large friction between the protective cap 75 and the end of the cylinder 71. When the cap 75 is pulled straight away a sufficient distance, the tube 40 has substantially pulled the cap 75 out. Even when the cap 75 has not been completely pulled out at this time, the frictional force between the cap 75 and the end of the cylinder 71 is already small enough to break the cap 75 to generate chips.

To ensure that the shield 40 remains non-rotating as the shield 30 rotates, a shield stop guide 45 may be provided on the outer surface of the shield 40, as shown in fig. 9, 15 and 16. The sheath stop guide 45 is configured to be directly or indirectly limited by a cartridge body stop guide (not shown) on the inner surface of the first cartridge body 10 to prevent rotation of the sheath 40. As shown in fig. 15 and 16, the sheath stopper guide 45 is a rib provided on the outer surface of the sheath 40 along the longitudinal axis of the sheath 40, which can prevent rotation of the sheath 40 in the circumferential direction on the one hand, and can guide the sheath 40 to move linearly in the longitudinal direction on the other hand. Accordingly, the cartridge body stopper guide may adopt a structure matched thereto, for example, a groove or a rib provided in the longitudinal direction, which directly or indirectly contacts the sheath stopper guide 45, so that the rotation of the sheath 40 may be restricted and the linear movement of the sheath 40 may be guided. Further description of the guard stop guide 45 and the cartridge body stop guide on the inner surface of the first cartridge body 10 will be given below in connection with the description of the sheath 50.

In order to enable the first claws 43 of the protective tube 40 to firmly clamp the protective cap 75, the protective tube 40 (e.g., at the second end 42) may be provided with a plurality of first claws 43, and these first claws 43 are uniformly distributed in the circumferential direction. As shown in fig. 14, the protection tube 40 is provided with three first claws 43 uniformly distributed in the circumferential direction. It will be appreciated that 4, 5 or more first claws 43 may also be provided. As shown in fig. 16 and 17, the three first claws 43 lock the open end of the cap 75 to ensure that the cap 75 can be smoothly pulled out. However, it is also contemplated that the first jaw 43 may be snapped onto the cap body of the cap 75 and, correspondingly, the cap body may be provided with recesses, textures, etc. that are prone to snagging.

Therefore, as can be seen from the above description, the cap removing mechanism of the present application only includes the protecting cover 30 and the protecting tube 40, and the combination of screwing action and direct pulling action can be realized by the threaded connection with the first bin 10, so that the protecting cover and the protecting cap can be removed conveniently and easily, and the pollution of the needle head by the protecting cap chips can be avoided.

Referring back to fig. 11, the first bin 10 is provided with a coupling buckle 12, and the second bin 20 is provided with a coupling slot 22, and the coupling buckle 12 and the coupling slot 22 can be snapped together to connect the first bin 10 and the second bin 20 together to define an interior space 26 for accommodating the prefilled syringe 70. It should be noted that it is also possible to provide a coupling slot on the first cartridge body 10 and a coupling catch on the second cartridge body. The coupling catch 12 and the coupling catch groove 22 can be realized in a number of ways. For example, the coupling clasp 12 may be a directional clasp that forms a non-removable snap feature when the coupling clasp 12 snaps together with the coupling clasp slot 22. Thus, in this case, the syringe cartridge structure 100 becomes a disposable product. Alternatively, the coupling clasp 12 may be a retractable clasp that forms a removable snap fit when the coupling clasp 12 and the coupling clasp slot 22 snap together. When subjected to a force in the opposite direction, the coupling buckle 12 can be separated from the coupling slot 22, so that the syringe cartridge structure 100 can be reused.

As shown in fig. 11 and 18, to ensure that the position of the pre-filled syringe 70 within the syringe housing structure 100 is unchanged, an end of the second housing 20 remote from the first housing 10 is provided with an opening (not shown) and a second jaw 21 disposed around the opening, the second jaw 21 being configured to abut against the barrel 71 of the pre-filled syringe 70 such that the pre-filled syringe 70 is clamped within the interior space 26. Specifically, the second jaw 21 is configured to lock the flange 73 of the barrel 71 of the pre-filled syringe 70. Thus, when the prefilled syringe 70 is pushed into the interior space 26 from the opening of the second housing 20, the second catch 21 locks the flange 73 so that it cannot be removed at will. Preferably, the inner space 26 may be formed by the sleeve 25 of the second cartridge body 20, and the inner diameter of the sleeve 25 is matched with the outer diameter of the cylinder 71, so that the cylinder 71 may be easily fitted into the sleeve 25, and an aligned position of the cylinder 71 may be ensured, so that precise control is maintained during the pushing.

It should be understood that in the syringe cartridge structure 100 shown in fig. 4 to 11, the first cartridge body 10 has a substantially cone shape with an elliptical cross section, the second cartridge body 20 has a substantially cylinder shape with an elliptical cross section, the protecting cover 30 has a substantially circular truncated cone shape, and the protecting tube 40 has a substantially cylindrical shape, but the present application is not limited thereto, and any other suitable shape may be adopted, such as a cylinder, a rectangular parallelepiped, etc. In addition, a transparent window is also shown on the illustrated first cartridge 10 to facilitate viewing of the filled pre-filled syringe 70. The direction of screwing is also indicated by means of an arrow on the outer surface of the side wall 32 of the protective cover 30, and a recess is provided for facilitating the application of force. Since these constructional details do not affect the achievement and understanding of the main function of the cartridge structure of the present application, they will not be described in further detail herein.

It should be noted that the sheath 50 is also shown in fig. 9, 10 and 11, but is not described in detail in the foregoing description, as the removal of the protective cover 30 and the cap 75 may be accomplished without the sheath 50 according to some embodiments of the present application. However, by providing the sheath 50, the syringe cartridge structure 100 of the present application may be provided with further advantages. The sheath 50 and its associated structure are described in detail below in conjunction with fig. 9, 10, 11 and 19.

As shown in fig. 9, 10, 11 and 19, the sheath 50 is surrounded by the first cartridge body 10, and the sheath 40 is surrounded by the sheath 50, the elastic member 60 is disposed between the second cartridge body 20 and the sheath 50, and the first end of the sheath 50 contacts the elastic member 60 to receive elastic force such that the sheath 50 abuts against the first stopper 15 of the first cartridge body 10, and the second end of the sheath 50 exceeds the end of the needle 74 of the pre-filled syringe 70. In this way, after removal of the cover 30 and cap 75, the needle 74 is hidden by the sheath 50 and the needle 74 is not visible to the patient, thus alleviating the patient's needle mind. It should be noted that although the elastic member 60 is shown in the drawings as a preferred form of a cylindrical coil spring, the present application is not limited thereto. In the description of the present application, the elastic member may include any member, component or structure capable of deforming under an external force, such as a cylindrical coil spring, a variable diameter coil spring, a scroll spring, a leaf spring, a plate spring, a torsion spring, a hydraulic spring, an air spring, or the like, and recovering the original shape after the external force is removed.

As shown in fig. 19, in order to alleviate pain in a patient, a plurality of bumps 52 may be uniformly distributed on an end surface 53 of the second end of the sheath 50 of the present application, such that when the sheath 50 is pressed against an injection site of a patient, the bumps 52 give a degree of pressure, so that the pain of the needle penetrating the injection site is less noticeable. Additionally or alternatively, the radial thickness of the second end of the sheath 50 may also be reduced, for example, the radial thickness of the second end of the sheath 50 may be 0.8-1.5mm, to provide a moderate pressure sensation at the injection site. Additionally or alternatively, the chamfer design of the second end of the sheath 50 may also be modified, for example, at least one of the inner chamfer 55 and the outer chamfer 56 of the second end of the sheath 50 may be set to less than 45 degrees so that the second end of the sheath 50 has a slightly sharpened tip, thereby improving the pressure sensation imparted to the injection site. Additionally or alternatively, the spring force exerted by the spring element 50 on the sheath 50 when the sheath 50 contacts the injection site may be varied, e.g., set to be above 1 newton. That is, when the sheath 50 is abutted against the first stopper 15 of the first cartridge body 10, the elastic member 60 exerts a certain elastic force, which must be overcome first at the time of injection, and the pressure feeling caused by the elastic force contributes to transfer of pain feeling at the time of injection by the patient. It should be appreciated that the above measures may be selected in the alternative or in any combination.

To control the depth of the injection, the sheath 50 comprises a trigger lever 51, the trigger lever 51 being configured to extend beyond a set distance D of the second cartridge body 20 when the sheath 50 is pushed by a force opposite to the spring force (which force is equal to the pressure exerted on the injection site at the time of injection), and the second end of the sheath 50 is retracted by the set distance D, as shown in fig. 10. The distance D is defined by the mating structures within the sheath 50 and the second cartridge body 20. For example, the second cartridge body 20 is provided with a second stop 24 (e.g., an end of the cannula 25) and the sheath 50 is provided with a step 59 (e.g., an end of the sheath inner stop guide 54 described below), the step 59 abutting against the second stop 24 when the sheath 50 is pushed beyond the set distance D of the second cartridge body 20, thereby preventing the sheath 50 from continuing to move. At this point, retraction of the sheath 50 exposes the needle 74, and the length of exposure corresponds to the depth of injection into the injection site. It should be noted that the second stop 24 may be formed by or provided separately from other portions of the second cartridge body 20, and the step 59 may also be formed by or provided separately from other portions of the sheath 50. On the other hand, with the syringe cartridge structure 100 mounted on the housing 210 of the host 200, when the trigger lever 51 extends a set distance D, an injection trigger switch (not shown) on the automatic injector 500 can be triggered, thereby allowing the drive mechanism to push the push rod 72. Therefore, the false triggering before injection can be prevented, and the injection depth can be accurately controlled. In order to avoid the triggering lever 51 being touched by mistake, the first housing 10 is further provided with a protecting portion 14 for covering and protecting the triggering lever 51.

In addition to the above-described function, the sheath 50 may also serve as an intermediate coupling between the first cartridge body 10 and the sheath tube 40. Specifically, as shown in fig. 19, the sheath 50 is provided on its outer surface with a sheath outer stopper guide 57 that mates with the cartridge body stopper guide on the inner surface of the first cartridge body 10, and is provided on its inner surface with a sheath inner stopper guide 54 that mates with the sheath stopper guide 45 on the outer surface of the sheath 40, so that the sheath 40 and the sheath 50 remain non-rotatable relative to the first cartridge body 10, but can move linearly relative to each other. In this way, it is ensured that the protective tube 40 does not rotate and can only move straight along the sheath inner stop guide 54 on the inner surface of the sheath 50 during the operation of removing the protective cover 30 and the protective cap 75. In addition, the end 58 of the sheath external stop guide 57 may rest against the first stop 15. It should be noted that the above-described operation of simultaneously removing the protective cover 30 and the protective cap 75 can still be accomplished without the protective sheath 50, as long as the sheath stopper guide 45 on the outer surface of the sheath 40 mates with the cartridge stopper guide on the inner surface of the first cartridge body 10.

The structure and operation of the syringe cartridge structure that has been filled with the prefilled syringe and includes the jacket is further described below with reference to fig. 20 and 21. Fig. 20 shows a loading state, and fig. 21 shows a cap taking state.

As shown in fig. 20, the first and second cartridge bodies 10 and 20 are coupled to each other by coupling snaps and grooves to define an inner space, and the protective cover 30 may be coupled to the first cartridge body 10 together with the protective cover 30 and the protective tube 40 by screwing on the first cartridge body 10. In this way, a syringe cartridge structure 100 is formed. When the pre-filled syringe 70 is loaded into the syringe barrel structure 100, the pre-filled syringe 70 may be pushed in from the opening of the second barrel 20 until the cap 75 is caught by the first catch 43 of the shield tube 40 and the flange 73 is locked by the second catch 21 of the second barrel 20. At this time, the pre-filled syringe 70 may be installed into the housing 210 of the host 200 of the auto-injector 500 along with the syringe cartridge structure 100. Next, for example, before injection, a cap removal operation needs to be performed. As shown in fig. 21, when the protective cover 30 is spirally moved along the first cartridge body 10 by applying a rotational force to the protective cover 30, the cylinder body 71 of the prefilled syringe 70 is held by the second cartridge body 20, while the protective cover 30 moves the protective tube 40 linearly, and the first claws 43 of the protective tube 40 move the protective cap 75 linearly, thereby removing the protective cap 75. Thus, the integrated removal of the protective cover 30 and the protective cap 75 can be achieved. In addition, as shown in fig. 21, when the protecting cover 30 and the protecting cap 75 are removed, the protecting cover 50 continues to abut against the first stopping portion 15 of the first bin 10 under the action of the elastic element 60, and the needle 74 is hidden in the protecting cover 50, so that the needle fear of the patient can be relieved.

The application has been described in detail with reference to specific embodiments thereof. It will be apparent that the embodiments described above and shown in the drawings are to be understood as illustrative and not limiting of the application. It will be apparent to those skilled in the art that various modifications or variations can be made in the present application without departing from the spirit thereof, and that such modifications or variations do not depart from the scope of the application.

Claims (16)

1. A syringe cartridge structure (100) for receiving a prefilled syringe (70), the syringe cartridge structure (100) comprising:

The first bin body (10) is provided with first threads (13) on the outer surface;

A second cartridge body (20) coupled with the first cartridge body (10) such that an interior space (26) defined by the first cartridge body (10) and the second cartridge body (20) is capable of accommodating a barrel (71) of the pre-filled injection syringe (70);

A protecting cover (30), the inner surface of which is provided with a second thread (33) matched with the first thread (13), so that the protecting cover (30) is in threaded connection with the first bin body (10);

A protective tube (40) rotatably coupled with the protective cover (30) and provided with a first jaw (43), the first jaw (43) being configured to be able to grip a protective cap (75) of the pre-filled injection syringe (70);

When the protecting cover (30) moves spirally relative to the first bin body (10) and is far away from the first bin body (10), the protecting cover (30) drives the protecting tube (40) to move linearly, and meanwhile, the first clamping jaw (43) drives the protecting cap (75) to move linearly so that the protecting cap (75) is separated from the prefilled syringe (70).

2. The syringe cartridge structure (100) of claim 1, wherein the protective cover (30) comprises an end plate (31) and a sidewall (32) extending from the end plate (31), the second threads (33) are disposed on an inner surface of the sidewall (32), and the first end (41) of the shield tube (40) is rotatably coupled with the end plate (31), and the first pawl (43) is disposed at the second end (42) of the shield tube (40).

3. The syringe cartridge structure (100) of claim 2, wherein one of the end plate (31) and the first end (41) of the shield tube (40) is provided with a protrusion (34), the other of the end plate (31) and the first end (41) of the shield tube (40) is provided with a recess (44), the protrusion (34) fits within the recess (44) such that the protrusion (34) is rotatable along the recess (44) but not separable from the recess (44).

4. The syringe cartridge structure (100) of claim 2, wherein said end plate (31) has a central bore, and a first end (41) of said shield tube (40) is rotatably coupled to an inner wall of said central bore.

5. The syringe cartridge structure (100) of claim 1, wherein a shield stop guide (45) is provided on an outer surface of the shield (40) and is configured to be directly or indirectly restrained by a cartridge stop guide on an inner surface of the first cartridge body (10) to prevent rotation of the shield (40).

6. The cartridge structure (100) of claim 1, wherein said shield tube (40) is provided with a plurality of first claws (43), said plurality of first claws (43) being uniformly distributed in a circumferential direction.

7. The syringe cartridge structure (100) of claim 1, wherein an end of the second cartridge body (20) remote from the first cartridge body (10) is provided with a second jaw (21), the second jaw (21) being configured to abut against a barrel (71) of the pre-filled injection syringe (70) such that the pre-filled injection syringe (70) is clamped within the interior space (26).

8. The syringe cartridge structure (100) of claim 7, wherein said second catch (21) is configured to lock a flange (73) of a barrel (71) of said pre-filled syringe (70).

9. The syringe cartridge structure (100) of any one of claims 1 to 8, further comprising a jacket (50) and an elastic element (60), the jacket (50) being surrounded by the first cartridge body (10) and the shield tube (40) being surrounded by the jacket (50), the elastic element (60) being disposed between the second cartridge body (20) and the jacket (50), a first end of the jacket (50) contacting the elastic element (60) to bear an elastic force such that the jacket (50) rests against a first stop (15) of the first cartridge body (10) and a second end of the jacket (50) exceeds the end of the needle (74) of the pre-filled injection syringe (70).

10. The syringe cartridge structure (100) of claim 9, wherein a jacket outer stop guide (57) is provided on an outer surface of the jacket (50) in contact with a cartridge body stop guide on an inner surface of the first cartridge body (10), and a jacket inner stop guide (54) is provided on an inner surface of the jacket (50) in contact with a jacket stop guide (45) on an outer surface of the jacket (40) such that the jacket (40) and the jacket (50) remain non-rotating relative to the first cartridge body (10).

11. The syringe cartridge structure (100) of claim 10, wherein said shield (50) comprises a trigger lever (51), said trigger lever (51) being configured to extend beyond said second cartridge body (20) a set distance (D) when said shield (50) is urged by a force opposite said spring force, and a second end of said shield (50) is retracted said set distance (D).

12. The syringe cartridge structure (100) of claim 9, wherein,

A plurality of uniformly distributed salient points (52) are arranged on the end surface (53) of the second end of the sheath (50); and/or

The radial thickness of the second end of the sheath (50) is 0.8-1.5mm; and/or

At least one of an inner chamfer (55) and an outer chamfer (56) of the second end of the sheath (50) is less than 45 degrees; and/or

The elastic force is set to 1 newton or more.

13. The syringe cartridge structure (100) of claim 9, wherein a second stopper (24) is provided on the second cartridge body (20), the second stopper (24) being configured to prevent movement of the sheath (50) when the sheath (50) is pushed beyond the set distance (D) of the second cartridge body (20).

14. An automatic injector (500), characterized in that the automatic injector (500) comprises:

the syringe cartridge structure (100) of any one of claims 1 to 13;

A pre-filled syringe (70) comprising a barrel (71) for containing a medical fluid, a push rod (72) for pushing the medical fluid, a needle (74) for penetrating a patient's body, and a cap (75) for protecting the needle, the pre-filled syringe (70) being mounted within the syringe housing structure (100) such that the push rod (72) extends out of the syringe housing structure (100), and the cap (75) being caught by a first catch (43) of a protective tube (40) of the syringe housing structure (100); and

A host (200) comprising a drive mechanism configured to be able to push the push rod (72).

15. The automatic injector (500) of claim 14, wherein the automatic injector (500) includes a coupling trigger sensor (233), the coupling trigger sensor (233) configured to generate a signal that allows the automatic injector (500) to continue a subsequent action when the syringe cartridge structure (100) is properly coupled.

16. The automatic injector (500) of claim 14 or 15, wherein the automatic injector (500) includes an injection trigger switch configured to be triggered when a trigger lever (51) of a sheath (50) of the syringe cartridge structure (100) moves a set distance, thereby allowing the drive mechanism to push the push rod (72).