CN215231102U - Injection pen - Google Patents

Abstract

The application relates to an injection pen, and belongs to the technical field of medical appliances. The injection device comprises a shell and an injection assembly arranged in the shell, wherein the shell is provided with an accommodating cavity which penetrates through two ends of the shell and is used for accommodating the injection assembly; the injection assembly comprises a plunger slidably arranged in the accommodating cavity, a clamping bottle for containing liquid and a pushing piece for pushing the plunger to enable the liquid in the clamping bottle to flow out, the end part of the pushing piece far away from the clamping bottle protrudes out of the shell, and a locking ring which is rotatably connected with the upper rod and locks the pushing piece is sleeved at the end part of the pushing piece protruding out of the shell. The locking end of the locking block is abutted against the limiting block, so that the locking ring does not rotate any more, the pushing piece is not repeatedly locked by the locking ring, and the repeated unlocking operation of workers is reduced.

Description

Injection pen

Technical Field

The application relates to the technical field of medical appliances, in particular to an injection pen.

Background

Syringes are generally contemplated when it is desired to inject a medicament directly into the tissue of a human. General injectors are provided with needles, which are mainly used for extracting or injecting liquid through the needles, but the needles are in a medicine pool shape in the tissues of patients when liquid medicines are injected into the patients through the needles, so that the patients slowly absorb the medicines.

In the related art, in order to improve the storage stability of the injection pen, the injection pen has a locking structure. The injection pen includes the casing, wears to locate injection assembly in the casing and rotates and connect in casing tip and be used for locking injection assembly's lock ring, is provided with locking structure between lock ring and the injection assembly, rotates the lock ring earlier before the injection pen uses, makes the lock ring no longer lock injection assembly.

But because the lock ring rotates with the casing to be connected for injection pen locks injection assembly again easily in the lock ring when using, and operating personnel need repeated unblock, makes injection pen operation comparatively troublesome.

SUMMERY OF THE UTILITY MODEL

In order to reduce the repetitive unlocking operation of an operator, the application provides an injection pen.

The injection pen provided by the application adopts the following technical scheme:

the injection pen comprises a shell and an injection assembly arranged in the shell, wherein the shell is provided with an accommodating cavity which penetrates through two ends of the shell and is used for accommodating the injection assembly; the injection assembly comprises a plunger slidably arranged in the accommodating cavity, a cartridge bottle for containing liquid and a pushing piece for pushing the plunger to enable the liquid in the cartridge bottle to flow out, the end part of the pushing piece far away from the cartridge bottle protrudes out of the shell, and a locking ring which is rotatably connected with the shell and locks the pushing piece is sleeved at the end part of the pushing piece protruding out of the shell; the injection pen is provided with one-way locking structure, the one-way locking structure is including locating the lock piece of casing terminal surface and protruding locating at least one limiting block of lock ring inner circle, the lock ring cover is located the lock piece, just the lock piece have with limiting block looks butt's locking end.

By adopting the technical scheme, when the injection pen is used, the pushing piece is extruded to enable the pushing piece to move along the length direction of the shell, the pushing piece drives the plunger to move towards the direction close to the card type bottle together, so that the liquid in the card type bottle is extruded by the plunger, the injection pen needs to be unlocked before use, the locking ring rotates during unlocking, after the injection assembly is unlocked by the locking ring, the locking end of the locking block is abutted to the limiting block, so that the locking ring does not rotate any more, the pushing piece is not repeatedly locked by the locking ring any more, and the repeated unlocking operation of workers is reduced.

Optionally, the limiting block has a limiting surface abutting against the locking end and a sliding surface for the locking end to slide through the limiting block.

Through adopting above-mentioned technical scheme, when the locking ring unblock, the locking ring uses the axis of impeller as the center pin rotation, and the locking end slips the glide plane of limiting the piece, makes the locking ring rotate smoothly on the casing, and in addition, when the locking end counter-rotation, locking end and limiting the face looks butt of limiting the piece, make the locking ring unable rotation, and then reduce the operation of the repeated unblock of staff.

Optionally, the sliding surface is arranged obliquely from the end of the limiting block far away from the locking ring to the inner ring of the locking ring.

Through adopting above-mentioned technical scheme, the slip surface slope sets up, and the slip surface is connected with the lock ring inner circle, makes the locking end slide the slip surface more smooth and easy to make the lock ring rotate more smooth and easy on the casing.

Optionally, the locking ring is provided with an anti-slip block protruding from an inner ring thereof, and the locking block is provided with a slip slot for the anti-slip block to slip.

Through adopting above-mentioned technical scheme, slide in the smooth slot through the anticreep piece, make the lock ring be difficult for breaking away from the casing.

Optionally, the one-way locking structure sets up a plurality ofly along the axis ring array of casing, has between two adjacent locking pieces to supply anticreep piece male space, the space with the smooth slot link up mutually.

Through adopting above-mentioned technical scheme, when the lock ring is connected with the casing, the lock piece is located outside the lock ring cover, and the anticreep piece inserts between two adjacent lock pieces from the space of two adjacent lock pieces, then rotates the lock ring, makes the anticreep piece slide in the smooth slot from the space to make the lock ring be connected with the lock piece.

Optionally, the locking block is connected with the end face of the casing through a connecting block, the locking end and the end face of the casing are provided with a moving groove for the anti-slip block to slide, and the moving groove is communicated with the gap.

Through adopting above-mentioned technical scheme, the locking end has the shifting chute with the casing terminal surface, and when the lock ring rotated on the casing, the anticreep piece got into the space from smooth slot and got into the shifting chute again in, made the anticreep piece increase in the displacement of casing, through the restriction of locking end simultaneously, made the anticreep piece be difficult for coming off from the lock piece, also be the lock ring be difficult for coming off from the casing.

Optionally, at least two limiting blocks are arranged on the same one-way locking structure, and the at least two limiting blocks are arranged in an extending direction of the inner ring of the locking ring.

Through adopting above-mentioned technical scheme, when the lock ring rotated, the lock piece slided on the limiting block, adjusted the gliding distance of lock piece on the limiting block through two at least limiting blocks, made the turned angle of lock ring adjustable.

Optionally, the injection pen is provided with a locking structure, the locking structure includes a locking block radially protruding from an inner ring of the locking ring and a locking ring disposed on the pushing member, the locking ring is provided with a locking groove for the locking block to be inserted and only capable of rotating and sliding and an unlocking groove for the locking block to move along an axis of the housing, and the unlocking groove is communicated with the locking groove.

By adopting the technical scheme, before injection, the locking block is positioned in the locking groove, so that the pushing piece cannot move along the length direction of the shell, when injection is needed, the locking ring is rotated, the locking block rotates along with the locking ring, and the locking block moves to the unlocking groove from the locking groove, so that the pushing piece can slide along the length direction of the shell, and the pushing piece cannot move before injection through the matching of the locking block and the locking ring, so that the liquid injection caused by misoperation is reduced.

Optionally, the unlocking groove is communicated with the end face of the locking ring close to the cassette bottle.

By adopting the technical scheme, when the pushing piece is inserted into the shell, the locking block enters the unlocking groove from the end face of the locking ring, so that the pushing piece is convenient to mount.

Optionally, the protruding direction of the locking end of the locking block is from the locking groove toward the unlocking groove.

Through adopting above-mentioned technical scheme, the locking piece is followed the locking groove and is moved towards the unlocking groove, makes the locking ring can only remove on the glide plane of limiting block, locking piece and butt face looks butt when the locking ring is to opposite direction rotation to make the locking piece remove to can't remove to the locking inslot again after the unlocking groove from the locking groove.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the locking end of the locking block is abutted against the limiting block, so that the locking ring does not rotate any more, the pushing piece is not locked by the locking ring any more repeatedly, and the repeated unlocking operation of workers is reduced;

2. the anti-falling block slides in the sliding slot, so that the locking ring is not easy to fall off from the shell, and the locking ring is not easy to fall off from the shell;

3. when the locking ring rotates, the locking block slides on the limiting blocks, and the sliding distance of the locking block on the limiting blocks is adjusted through at least two limiting blocks, so that the rotating angle of the locking ring can be adjusted.

Drawings

Fig. 1 is a schematic structural diagram of an injection pen according to an embodiment of the present application.

Fig. 2 is an exploded view of the housing and cap of the embodiment of the present application.

FIG. 3 is a cross-sectional view of a housing of an embodiment of the present application from an axis.

Fig. 4 is an enlarged view of a in fig. 3.

Fig. 5 is a schematic structural view of a plunger of an embodiment of the present application passing through a pusher.

Fig. 6 is a schematic structural diagram of a plunger according to an embodiment of the present application.

FIG. 7 is a cross-sectional view of a housing of an embodiment of the present application from another perspective of the axis.

Fig. 8 is a cross-sectional view of a plunger of an embodiment of the present application passing through a pusher.

Fig. 9 is a schematic structural diagram of an upper positioning structure according to an embodiment of the present application.

Fig. 10 is a schematic structural view of the following structure according to the embodiment of the present application.

Fig. 11 is an enlarged view of B in fig. 5.

Fig. 12 is a schematic structural view of a lock ring according to an embodiment of the present application.

Fig. 13 is a schematic structural diagram of a lock ring according to an embodiment of the present application.

Fig. 14 is a schematic structural diagram of a lock block according to an embodiment of the present application.

Fig. 15 is a schematic structural diagram of a limiting block according to an embodiment of the application.

Fig. 16 is a schematic structural view of a sliding surface and a limiting surface according to an embodiment of the present disclosure.

Fig. 17 is a schematic structural diagram of a locking end of an embodiment of the present application.

Description of reference numerals: 1. a housing; 11. an accommodating chamber; 12. an installation end; 13. a liquid outlet end; 14. a rod is arranged; 141. an elastic baffle plate; 142. a sliding cavity; 143. a push chamber; 144. a limiting surface; 15. a lower rod; 2. an injection assembly; 21. a plunger; 211. pushing the head; 212. a pushing part; 2121. pushing the surface; 2122. a guide surface; 213. an abutting portion; 214. a starting end; 215. a guide block; 22. a cartridge bottle; 221. a liquid containing cavity; 222. moving the plug; 23. a pusher member; 231. an elastic pushing plate; 232. a guide groove; 233. a fixed surface; 234. a yielding groove; 235. an elastic plate; 236. a hook; 237. an end cap; 3. a pen cap; 4. a locking ring; 41. a locking block; 42. a limiting block; 421. defining a face; 422. a sliding surface; 43. an anti-drop block; 5. a positioning ring; 6. a locking ring; 61. a locking groove; 62. unlocking the groove; 7. a locking block; 71. a locking end; 72. a moving groove; 73. a void; 8. connecting blocks; 81. and (4) a sliding slot.

Detailed Description

The present application is described in further detail below with reference to figures 1-17.

The embodiment of the application discloses an injection pen.

Referring to fig. 1 and 2, the injection pen includes a housing 1, an injection assembly 2 penetrating the housing 1, and a cap 3, the housing 1 has a containing cavity 11 penetrating both ends of the housing in a length direction, the two ends of the housing 1 are defined as a mounting end 12 for the injection assembly 2 to enter the containing cavity 11 and a liquid outlet end 13 for the injection assembly 2 to eject the solution, the cap 3 covers the liquid outlet end 13 of the housing 1, and the cap 3 is movably clamped with the housing 1.

The shell 1 comprises an upper rod 14 with a mounting end 12 and a lower rod 15 with a liquid outlet end 13, and the upper rod 14 and the lower rod 15 are mutually clamped and coaxially arranged.

Referring to fig. 2 and 3, the injection assembly 2 includes a plunger 21 slidably disposed in the accommodating cavity 11, a cartridge 22 having a liquid accommodating cavity 221, and a pushing member 23 for pushing the plunger 21 to move toward the cartridge 22, the cartridge 22 is coaxially mounted in the lower rod 15, the liquid accommodating cavity 221 is communicated with an end portion of the cartridge 22 close to the upper rod 14, the cartridge 22 is slidably and sealingly mounted with a movable plug 222 for sealing the liquid accommodating cavity 221, the movable plug 222 is generally made of an elastic material having deformation capability such as rubber or silica gel, and a liquid outlet is disposed at an end of the cartridge 22 away from the upper rod 14.

Before injection, the plunger 21 is coaxially and slidably mounted in the upper rod 14, the pushing part 23 penetrates through the upper rod 14 and is slidably sleeved on the plunger 21, a pushing head 211 is arranged at one end, close to the cartridge bottle 22, of the plunger 21, the diameter of the pushing head 211 is slightly smaller than that of the liquid containing cavity 221, so that the pushing head 211 can enter the liquid containing cavity 221, during injection, the pushing part 23 slides towards one end, close to the cartridge bottle 22, in the containing cavity 11, and the pushing part 23 drives the plunger 21 to move until the pushing head 211 of the plunger 21 abuts against the movable plug 222 and drives the movable plug 222 to move towards one end, close to the needle head, and liquid in the liquid containing cavity 221 is ejected from the needle head under the extrusion of the movable plug 222.

Referring to fig. 4 and 5, a pushing assembly for enabling the pushing member 23 to push the plunger 21 to move is arranged between the pushing member 23 and the plunger 21. The pushing assembly comprises a plurality of pushing parts 212 and an elastic pushing plate 231, the pushing parts 212 are integrally arranged on the outer side wall of the plunger 21, and the pushing parts 212 are arranged at intervals along the length direction of the plunger 21. Referring to fig. 5 and 6, the pushing portion 212 has a pushing surface 2121 and a guiding surface 2122, the guiding surface 2122 is an inclined surface, the guiding surface 2122 is arc-connected to the pushing surface 2121, and the guiding surface 2122 is inclined from the end close to the pushing head 211 to the end far from the pushing head 211 to the side far from the plunger 21.

Referring to fig. 4 and 5, the elastic pushing plate 231 is integrally disposed at one end of the pushing member 23 close to the lower rod 15, one end of the elastic pushing plate 231 away from the pushing member 23 is bent toward the axis of the pushing member 23 (i.e., toward the plunger 21), so that the end of the elastic pushing plate 231 abuts against the outer sidewall of the plunger 21, and the elastic pushing plate 231 is made of plastic material, so that the end of the elastic pushing plate 231 has elasticity to be bent away from the plunger 21. Normally, the end of the elastic pushing plate 231 abuts against the outer side wall of the plunger 21, when the pushing member 23 needs to push the plunger 21 to move, the pushing member 23 is moved to one side close to the lower rod 15, the pushing member 23 drives the elastic pushing plate 231 to move along the length direction of the plunger 21, the elastic pushing plate 231 abuts against the pushing surface 2121 of the pushing part 212, and the pushing member 23 drives the plunger 21 to move together when moving; when moving again, the pushing member 23 is moved to a side away from the lower rod 15, so that the end of the elastic pushing plate 231 passes through the guiding surface 2122 of the next pushing portion 212 and passes over the pushing portion 212, and then the elastic pushing plate 231 is moved to a side close to the lower rod 15, the elastic pushing member 23 abuts against the pushing surface 2121 of the pushing portion 212, and the pushing member 23 drives the plunger 21 to move together to the lower rod 15.

In order to make the pushing member 23 push the plunger 21 more stably, a set of opposite outer side walls of the plunger 21 are provided with two pushing portions 212, two elastic pushing plates 231 are also provided, the two elastic pushing plates 231 are arranged in a central symmetry manner about the axis of the pushing member 23, and the two elastic pushing plates 231 correspond to the two rows of pushing portions 212.

It should be noted that the interval between two adjacent pushing portions 212 in the same row of pushing portions 212 can be set according to requirements, in this embodiment, the interval between two adjacent pushing portions 212 is 6mm, and if required, the interval between two adjacent pushing portions 212 can also be set to be 5mm or 3 mm. In addition, the intervals between two adjacent pushing portions 212 in the same row of pushing portions 212 may also be different, for example, the distance between the first pushing portion 212 and the second pushing portion 212 is 6mm, the distance between the second pushing portion 212 and the third pushing portion 212 is 5mm, and the distance between the third pushing portion 212 and the fourth pushing portion 212 is 3mm, and the distances are set according to actual requirements.

Referring to fig. 6 and 7, further, the injection pen is provided with a locking structure for preventing the plunger 21 from backing up. The anti-disengaging structure includes the elastic baffle 141 and the plurality of abutting portions 213 arranged inside the upper rod 14, the elastic baffle 141 is integrally connected to the inner side wall of the upper rod 14, the end portion of the elastic baffle 141 close to the lower rod 15 is bent towards the plunger 21, the elastic baffle 141 is made of plastic material, and a gap is formed between the elastic baffle 141 and the inner side wall of the upper rod 14, so that the elastic baffle 141 has elasticity of bending towards one side close to the inner side wall of the upper rod 14.

The abutting portions 213 are integrally protruded on the outer side wall of the plunger 21, the abutting portions 213 and the pushing portions 212 are disposed on different sides of the plunger 21, the plurality of abutting portions 213 are disposed at intervals along the length direction of the plunger 21, and the interval distance between two adjacent abutting portions 213 is the same as the interval distance between two adjacent pushing portions 212. In addition, in order to improve the anti-falling effect of the anti-falling structure and the stability of the plunger 21 in the upper rod 14, a set of opposite outer side walls of the plunger 21 are provided with two abutting portions 213, the two elastic baffles 141 are arranged in a central symmetry manner with respect to the axis of the upper rod 14, and the two elastic baffles 141 are in one-to-one correspondence with the two rows of abutting portions 213.

The abutting portion 213 has the same or similar structure as the pushing portion 212, and is named and located differently. One end of the plunger 21 having the push head 211 is defined as a start end 214, the abutting portion 213 near the start end 214 is defined as a first abutting portion 213, the abutting portion 213 adjacent to the first abutting portion 213 in the length direction of the plunger 21 is defined as a second abutting portion 213, and the rest are named in the same way, similarly, the push portion 212 near the start end 214 is defined as a first push portion 212, the push portion 212 adjacent to the first push portion 212 in the length direction of the plunger 21 is defined as a second push portion 212, and the rest are named in the same way. The distance from the first abutting portion 213 to the pushing head 211 is smaller than the distance from the first pushing portion 212 to the pushing head 211, the first pushing portion 212 is located between the first abutting portion 213 and the second abutting portion 213, and the position relationship between the rest pushing portions 212 and the abutting portions 213 is similar.

When the pusher 23 moves to the side far from the lower rod 15 in the upper rod 14, the elastic baffle 141 is abutted against the abutting part 213, so that the plunger 21 is not easy to move along with the pusher 23, and further the position of the plunger 21 is kept fixed, when the pusher 23 moves to the side close to the lower rod 15 in the upper rod 14, the elastic baffle 141 slides outside the plunger 21, so that the plunger 21 and the pusher 23 move together, meanwhile, after the plunger 21 moves for the distance (namely 6 mm) between two adjacent pushing parts 212, the elastic baffle 141 slides over the next abutting part 213, at this time, as the elastic baffle 141 falls to the outside of the plunger 21 from the highest position far from the plunger 21 of the abutting part 213, a collision sound is generated between the elastic baffle 141 and the plunger 21, and the operator is prompted by the collision sound, and at this time, a certain amount of liquid is injected.

Referring to fig. 8, a set of opposite inner side walls of the pushing member 23 are provided with guide grooves 232, the guide grooves 232 are communicated with the end surface of the pushing member 23 far away from the pushing head 211, a set of opposite outer side walls of the plunger 21 are provided with guide blocks 215 which slide in the guide grooves 232 in a protruding manner, and when the plunger 21 is inserted into the pushing member 23, the guide blocks 215 are inserted into the guide grooves 232.

The wall of the guide groove 232 close to the elastic pushing plate 231 is a fixed surface 233, when the liquid in the liquid containing cavity 221 is completely discharged out of the cassette bottle 22, the plunger 21 slides out of the upper rod 14 and is partially inserted into the lower rod 15, at this time, the elastic baffle plate 141 abuts against the last abutting part 213, so that the plunger 21 cannot move to the side far away from the lower rod 15, and the guide block 215 abuts against the fixed surface 233, so that the pushing part 23 cannot be pulled out from the mounting end 12 of the upper rod 14.

In order to quantify the liquid injected by the injection pen each time, the pushing piece 23 is provided with an upper positioning structure and a lower positioning structure, and the pushing piece 23 can only slide in a fixed range on the upper rod 14 through the arrangement of the upper positioning structure and the lower positioning structure.

Referring to fig. 9, the upper positioning structure includes a locking ring 4 and a positioning ring 5, the locking ring 4 is coaxially and rotatably connected to an end surface of the upper rod 14 far from the lower rod 15, one end of the pushing member 23 far from the lower rod 15 protrudes out of the upper rod 14, and is provided with an end cover 237 covering the pushing member 23, the positioning ring 5 is integrally formed at an end portion of the pushing member 23 protruding out of the upper rod 14, the positioning ring 5 is located on a side of the locking ring 4 far from the upper rod 14, and a diameter of the positioning ring 5 is larger than an inner diameter of the locking ring 4, so that the positioning ring 5 cannot enter the upper rod 14.

Referring to fig. 10, the lower positioning structure includes two hooks 236 and a limiting surface 144 for limiting the hooks 236 to separate from the upper rod 14, the hooks 236 are protruded on the outer sidewall of the pushing member 23, and in order to improve the limiting effect of the hooks 236, the two hooks 236 are respectively disposed on the same side as the two elastic pushing plates 231. The upper rod 14 is provided with a sliding cavity 142 and a pushing cavity 143 which are coaxial and mutually communicated, the sliding cavity 142 is communicated with the end face of the mounting end 12 of the upper rod 14, the pushing cavity 143 is communicated with the end face of the upper rod 14 far away from the mounting end 12, and the diameter of the pushing cavity 143 is larger than that of the sliding cavity 142, so that a step is formed inside the upper rod 14, the step surface is a limiting surface 144, and the distance from the end part of the hook 236 far away from the pushing part 23 to the axis of the pushing part 23 is larger than that of the sliding cavity 142, so that the hook 236 can be abutted against the limiting surface 144 when moving close to the sliding cavity 142.

Referring to fig. 11, in order to enable the hook 236 to enter the pushing cavity 143 from the sliding cavity 142, an abdicating groove 234 is formed on an outer side wall of the pushing member 23, the abdicating groove 234 is communicated with an inner portion of the pushing member 23, the abdicating groove 234 is U-shaped so that an elastic plate 235 is formed on the outer side wall of the pushing member 23, the hook 236 is disposed at an end portion of the elastic plate 235, and a guide surface 2122 is disposed on a side surface of the hook 236 close to the elastic pushing plate 231. When the pushing member 23 slides into the sliding cavity 142 of the upper rod 14, the guide surface 2122 of the hook 236 abuts against the inner side wall of the sliding cavity 142, the force on the wall of the sliding cavity 142 acts on the hook 236, and acts on the elastic plate 235 through the hook 236, so that the elastic plate 235 bends toward the pushing member 23, and meanwhile, the hook 236 moves toward the pushing plate along with the elastic plate 235, so that the hook 236 does not protrude from the outer side wall of the pushing member 23, and the pushing member 23 smoothly enters the sliding cavity 142, when the elastic plate 235 enters the pushing cavity 143, the acting force on the wall of the sliding cavity 142 disappears, the elastic plate 235 restores to deform, and the hook 236 protrudes from the outer side wall of the pushing member 23.

When the pushing member 23 moves toward the lower rod 15, the pushing member 23 slides in the sliding cavity 142 until the positioning ring 5 abuts against the end surface of the locking ring 4 away from the upper rod 14, and when the pushing member 23 moves toward the lower rod 15, the pushing member 23 slides in the sliding cavity 142 until the limiting surface of the hook 236 abuts against the limiting surface 144 of the upper rod 14, and through the arrangement of the upper positioning structure and the lower positioning structure, the calculation formula of the moving distance of the pushing member 23 is that the distance from the limiting surface of the hook 236 to the positioning ring 5 minus the limiting surface 144 to the side surface of the locking ring 4 away from the upper rod 14, and the moving distance of the pushing member 23 in this embodiment is 6mm, that is, the distance between two adjacent pushing portions 212 in the same row of pushing portions 212.

Referring to fig. 12 and 13, to reduce inadvertent operation of the pusher 23 when not in use, the injection pen is also provided with a locking structure. The locking structure comprises at least one locking block 41 and a locking ring 6, the locking block 41 protrudes out of the inner ring of the locking ring 4 in the radial direction, the locking ring 6 is integrally arranged on the outer side wall of the pushing part 23, the outer diameter of the locking ring 6 is larger than that of the pushing part 23, the outer ring of the locking ring 6 is provided with a locking groove 61 for the locking block 41 to slide and insert, the locking groove 61 is an arc-shaped groove coaxial with the pushing part 23, the outer ring of the locking ring 6 is further provided with an unlocking groove 62 for the locking block 41 to slide along the length direction of the pushing part 23, the unlocking groove 62 is long-strip-shaped, the length direction of the unlocking groove 62 is the same as that of the pushing part 23, the unlocking groove 62 is communicated with the locking groove 61, the unlocking groove 62 is communicated with the side face, far away from the positioning ring 5, of the locking ring 6, and the locking block 41 can conveniently enter the unlocking groove 62. In addition, in order to improve the stability of the locking structure, three locking blocks 41 surrounding the pushing member 23 and arranged at the same interval are convexly arranged on the inner ring of the locking ring 4, and three groups of locking grooves 61 and three groups of unlocking grooves 62 corresponding to the three locking blocks 41 one by one are arranged on the locking ring 6.

Before the injection pen is injected, the locking block 41 is positioned in the locking groove 61, the pushing element 23 cannot slide in the sliding cavity 142 of the upper rod 14 by the limitation of the locking block 41, when the injection pen needs to be injected, the locking block 7 is rotated by taking the axis of the locking block 7 as a central axis, the locking block 7 drives the locking block 41 to rotate in the locking groove 61, the locking block 41 enters the unlocking groove 62, at the moment, the locking block 41 can slide in the unlocking groove 62 along the length direction of the unlocking groove 62, so that the pushing element 23 can slide in the sliding cavity 142 of the upper rod 14, even if the pushing element 23 drives the plunger 21 to move.

Referring to fig. 14 and 15, the injection pen is further provided with unidirectional locking structures which enable the locking ring 4 to rotate only in one direction, the number of the unidirectional locking structures is three, which is the same as that of the locking blocks 41, and the three unidirectional locking structures are arranged around the axis of the upper rod 14 at intervals. The one-way locking structure comprises a locking block 7 and at least one limiting block 42, the locking block 7 is connected to the end face, far away from the lower rod 15, of the upper rod 14, the locking block 7 is located in the locking ring 6, the locking block 7 is provided with a locking end 71 protruding towards the inner ring of the locking ring 6 and abutting against the inner ring of the locking ring 4, the locking end 71 is made of plastic materials and has elasticity, and the locking end 71 has a tendency of always abutting against the inner ring of the locking ring 4.

Referring to fig. 15 and 16, the limiting block 42 is protruded at the inner ring of the locking ring 6, the limiting block 42 has a limiting surface 421 abutting against the locking end 71 and a sliding surface 422 for sliding the locking end 71, and the sliding surface 422 is inclined from the end of the limiting block 42 far away from the locking ring 4 to the inner ring of the locking ring 4. The number of the limiting blocks 42 can be set according to actual conditions, two limiting blocks 42 are arranged in the same one-way locking structure in the embodiment, and the two limiting blocks are arranged on the inner ring of the locking ring 4 at intervals and are in the same arrangement state.

Referring to fig. 16 and 17, in order to make the lock ring 4 hard to rotate after the lock blocks 41 of the lock ring 4 are disengaged from the lock grooves 61, the lock ring 4 can rotate in a direction in which the lock blocks 41 slide from the lock grooves 61 to the unlock grooves 62. The locking end 71 of the locking block 7 extends from the locking groove 61 to the unlocking groove 62, and the limiting block 42 is also arranged such that the limiting surface 421 can abut against the end surface of the locking end 71.

The end faces, far away from the lower rod 15, of the locking blocks 7 and the upper rod 14 are fixedly connected through the connecting block 8, the end faces, far away from the lower rod 15, of the locking ends 71 and the upper rod 14 are provided with moving grooves 72, gaps 73 are formed between every two adjacent locking blocks 7, the gaps are communicated with the moving grooves 72, the side faces, close to the inner ring of the locking ring 4, of the connecting block 8 are provided with sliding slots 81, and the sliding slots 81 are communicated with the gaps 73. The protruding anticreep piece 43 that is equipped with of inner circle of lock ring 4, the width of anticreep piece 43 is less than the width in space 73, anticreep piece 43 gets into between two adjacent limiting blocks 42 from space 73 when making lock ring 4 cover locate limiting block 42 on, and anticreep piece 43 inserts in smooth slot 81, when lock ring 4 rotates at last pole 14, anticreep piece 43 is at smooth slot 81 and shifting chute 72 internal rotation, through anticreep piece 43's setting, difficult follow pole 14 drops when making lock ring 4 rotate.

The implementation principle of the injection pen in the embodiment of the application is as follows: the injection pen has three states before, during and after injection: before injection, the locking block 41 is positioned in the locking groove 61, and the pushing piece 23 cannot be inserted and pulled out, namely cannot slide in the sliding cavity 142 along the length direction of the upper rod 14 through the matching of the locking block 41 and the locking groove 61; when the injection is to be performed, a venting process is performed, the locking block 7 is rotated, the locking block 41 slides from the locking groove 61 to the unlocking groove 62, then the housing 1 is inverted, the needle of the housing 1 faces upwards, then the pushing piece 23 is pressed, the pushing piece 23 drives the plunger 21 to move towards the cassette bottle 22, the pushing head 211 squeezes the liquid in the liquid containing cavity 221, the gas in the liquid containing cavity 221 is discharged, and at the moment, the elastic baffle plate 141 passes through the first abutting part 213 and abuts against the abutting part 213.

During injection, the pushing member 23 is pulled in the direction away from the lower rod 15, so that the pushing member 23 slides in the sliding cavity 142 until the hook 236 abuts against the limiting surface 144, then the pushing member 23 is pushed to the side close to the lower rod 15, the elastic pushing member 23 of the pushing member 23 abuts against the pushing part 212 and drives the plunger 21 to move to the side close to the lower rod 15 until the positioning ring 5 abuts against the locking ring 4, the pushing head 211 extrudes the liquid in the liquid containing cavity 221, so that the liquid is discharged from the needle, and the steps are repeated for several times until the liquid in the liquid containing cavity 221 is completely discharged.

After injection, the elastic blocking ring abuts against the last abutting part 213, the plunger 21 cannot move to the side far away from the lower rod 15, the guide block 215 abuts against the fixed surface 233, the pushing part 23 cannot be pulled out from the mounting end 12 of the upper rod 14, and the positioning ring 5 abuts against the locking ring 4 after liquid injection, so that the pushing part 23 cannot move in the upper rod 14, and further the pushing part 23 is locked in the upper rod 14.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. Injection pen, its characterized in that: the injection device comprises a shell (1) and an injection assembly (2) arranged in the shell (1), wherein the shell (1) is provided with an accommodating cavity (11) which penetrates through two ends of the shell and is used for accommodating the injection assembly (2); the injection assembly (2) comprises a plunger (21) slidably arranged in the accommodating cavity (11), a cassette bottle (22) for containing liquid and a pushing member (23) for pushing the plunger (21) to enable the liquid in the cassette bottle (22) to flow out, the end part, far away from the cassette bottle (22), of the pushing member (23) protrudes out of the shell (1), and a locking ring (4) which is rotatably connected with the shell (1) and locks the pushing member (23) is sleeved at the end part, protruding out of the shell (1), of the pushing member (23);

the injection pen is provided with one-way locking structure, one-way locking structure is including locating locking piece (7) of casing (1) terminal surface and protruding locating at least one limiting block (42) of locking ring (4) inner circle, locking ring (4) cover is located locking piece (7), just locking piece (7) have with limiting block (42) looks butt's locking end (71).

2. The injection pen of claim 1, wherein: the limiting block (42) is provided with a limiting surface (421) which is abutted against the locking end (71) and a sliding surface (422) for the locking end (71) to slide through the limiting block (42).

3. The injection pen of claim 2, wherein: the sliding surface (422) is arranged obliquely from the end of the limiting block (42) far away from the locking ring (4) to the inner ring of the locking ring (4).

4. The injection pen of claim 1, wherein: the inner ring of the locking ring (4) is convexly provided with an anti-falling block (43), and the locking block (7) is provided with a sliding slot (81) for the anti-falling block (43) to slide.

5. The injection pen of claim 4, wherein: the one-way locking structure is arranged in a plurality of annular arrays along the axis of the shell (1), a gap (73) for inserting the anti-falling block (43) is formed between every two adjacent locking blocks (7), and the gap (73) is communicated with the sliding slot (81).

6. The injection pen of claim 5, wherein: the locking block (7) is connected with the end face of the shell (1) through a connecting block (8), the locking end (71) is connected with the end face of the shell (1) through a moving groove (72) for the anti-falling block (43) to slide, and the moving groove (72) is communicated with the gap (73).

7. The injection pen of claim 1, wherein: at least two limiting blocks (42) are arranged on the same one-way locking structure, and the at least two limiting blocks (42) are arranged in an extending direction of the inner ring of the locking ring (4).

8. The injection pen of claim 1, wherein: the injection pen is provided with a locking structure, the locking structure comprises a locking block (41) which is radially and convexly arranged on the inner ring of the locking ring (4) and a locking ring (6) which is arranged on the pushing piece (23), the locking ring (6) is provided with a locking groove (61) which is used for the locking block (41) to be inserted and can only rotationally slide and an unlocking groove (62) which is used for the locking block (41) to move along the axis of the shell (1), and the unlocking groove (62) is communicated with the locking groove (61).

9. The injection pen of claim 8, wherein: the unlocking groove (62) is communicated with the end face, close to the cassette bottle (22), of the locking ring (6).

10. The injection pen of claim 8, wherein: the protruding direction of the locking end (71) of the locking block (7) is from the locking groove (61) toward the unlocking groove (62).

Images