CN113559360B

CN113559360B - Injection syringe

Info

Publication number: CN113559360B
Application number: CN202010347928.2A
Authority: CN
Inventors: 叶进民
Original assignee: CC Biotechnology Corp
Current assignee: CC Biotechnology Corp
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2023-05-23
Anticipated expiration: 2040-04-28
Also published as: CN113559360A

Abstract

The invention relates to an injector, which comprises an injection mechanism, wherein the injection mechanism is used for detachably connecting a medicament bottle, the injection mechanism can be manually triggered to change an injection mode and a standby mode, the injection mechanism comprises a shell, a spiral pushing component, a metering guide sleeve, a total amount control nut, an inclined Zhang Niu and a metering screw rod, the injection mechanism can be changed into the injection mode after being connected with the medicament bottle, the injector has a function of quantitatively outputting a plurality of medicament liquids, after all medicament liquids in the medicament bottle are used up, a user can detach the medicament bottle from the front end of the shell, the injection mechanism can be changed into the standby mode, a check ratchet spring of the metering guide sleeve can be separated from a one-way ratchet part of the shell to release the check function, the metering screw rod can be pushed back to the original position, and meanwhile, the metering guide sleeve is driven to reversely rotate, and the total amount control nut is pushed back to the initial full-amount position of the metering guide sleeve, so that the injector can be reused.

Description

Injection syringe

Technical Field

The present invention relates to a syringe, and more particularly, to a syringe capable of assembling a medicine bottle to perform quantitative output of medicine liquid multiple times, and capable of being replaced with another full-dose medicine bottle for reuse after the medicine liquid is completely used up.

Background

The syringes are based on safety regulations for injection of pharmaceutical fluids, and existing syringes already have a limited number of re-use functions. The prior art syringe is divided into two types, namely a metering syringe and a metering syringe, and the metering syringe is assembled with a medicament bottle, and then the metering syringe pushes a piston in the medicament bottle to move for a certain travel distance by the action of a push rod at the rear end of the syringe through the linkage of an internal pushing mechanism, and then outputs quantitative medicament liquid through a needle head connected to the front end of the medicament bottle.

Although the existing metering injection pen can achieve the function of quantitatively outputting the medicament liquid or further has the function of saving labor in operation, after the medicament in the assembled medicament bottle of the existing injector is used up, the pushing mechanism in the injector does not have the function of returning to the initial state, so that the existing injector is discarded and cannot be reused.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: the injector solves the problem that the prior metering injector cannot be restored to the initial state for reuse after being used.

The technical proposal provided by the invention is as follows: there is provided a syringe detachably coupling a medicine bottle having a medicine liquid with a needle assembly connected to a front end of the medicine bottle, wherein the syringe defines a central axis extending in a front-rear axial direction and includes an injection mechanism having an injection mode and a standby mode, and the syringe can be manually triggered to perform a change of the injection mode and the standby mode, the injection mechanism comprising:

A shell, which is provided with a movable space penetrating along the direction of the central shaft, wherein the front end of the shell is detachably connected with the medicament bottle, and the front section peripheral wall of the movable space of the shell forms a one-way ratchet part;

the spiral pushing component can be spirally arranged in the movable space of the shell along the direction of the central shaft, extends out of the outer side of the rear end of the shell and can be pressed to generate spiral pushing force;

the metering guide sleeve is arranged in the shell in a fixed-point rotating manner, penetrates through the spiral pushing assembly and can be controlled to rotate together with the spiral pushing assembly, the metering guide sleeve comprises a guide sleeve body and a plurality of non-return ratchet elastic buckles, the guide sleeve body is provided with a guide sleeve middle hole and at least one spiral part positioned on the inner peripheral wall of the guide sleeve middle hole, the outer peripheral surface of the rear section of the guide sleeve body forms a guide sleeve threaded part, the front end of the guide sleeve body is provided with a guide sleeve front end part, the non-return ratchet elastic buckles are formed on the outer side surface of the guide sleeve front end part, when the non-return ratchet elastic buckles are controlled to be meshed with the unidirectional ratchet part of the shell, the metering guide sleeve can only be driven to rotate in a forward direction to be in the injection mode, and when the non-return ratchet elastic buckles are separated from the unidirectional ratchet part of the shell, the metering guide sleeve can rotate in a forward direction and a reverse direction to be in the standby mode;

A total amount control nut which is arranged in the spiral pushing component in a linear motion along the direction of the central shaft and is in threaded connection with a guide sleeve thread part at the rear section of the metering guide sleeve;

a tilt button movably installed in the front end of the housing along the direction of the central axis, the tilt button Niu Neng being driven to change the on-off state of the non-return ratchet spring relative to the non-return ratchet portion of the housing to change the injection mode and the standby mode; and

the metering screw rod penetrates through the inclined Zhang Niu and the shell, is screwed in the metering guide sleeve, comprises a screw rod body with a screw thread part, is in threaded connection with the screw thread part in the metering guide sleeve, and is in threaded fit with the screw thread part, the front end of the screw rod body extends out of the front of the inclined tension button, when the injection mechanism is in an injection mode, the screw movement of the metering guide sleeve can drive the metering screw rod to linearly move in the shell along the direction of a central shaft so as to perform quantitative output of medicament liquid of the medicament bottle, when the injection mechanism is in a standby mode, the check ratchet wheel of the metering guide sleeve is elastically buckled and separated from the unidirectional ratchet wheel part of the shell, the metering screw rod can be linearly moved backwards along the central shaft to be retracted into the original position in the shell, the metering guide sleeve is driven to reversely rotate, and the total amount of the screw cap is pushed backwards to the initial full-amount position of the metering guide sleeve, so that the syringe can be reassembled with another medicament bottle for repeated use.

In the syringe as described above, the syringe includes a cartridge case having a receiving space penetrating in a direction of the central axis, the cartridge case is detachably assembled with the medicament bottle, the front end of the cartridge case is detachably assembled with the needle member, the cartridge case is assembled with the front end of the housing of the injection mechanism, the cartridge case is capable of triggering the bias sheet Niu Chaohou to move and drive the plurality of check ratchet latches to engage the one-way ratchet portion of the housing in the injection mode, and when the cartridge case is detached from the front end of the housing of the injection mechanism, the bias sheet Niu Neng moves forward to disengage the check ratchet latches from the one-way ratchet portion of the housing in the standby mode.

In the syringe as described above, the cartridge case includes a case body, the peripheral wall of the case body is provided with at least one viewing window, the rear end of the case body has a connection portion, the peripheral wall of the case body has a limit flange at the front end of the connection portion, the outer peripheral surface of the connection portion forms a plurality of clamping beads, the front end of the housing is a case joint portion, the inner peripheral wall of the case joint portion forms a plurality of L-shaped clamping grooves, the L-shaped clamping grooves include a straight groove section parallel to the central shaft and a transverse section connected to the rear end of the straight groove section, and when the connection portion of the rear end of the cartridge case is placed in the case joint portion of the front end of the housing, the clamping beads can move along the straight groove section of the L-shaped clamping grooves and then screw into the end positioning of the transverse section, so that the cartridge case joint is positioned at the front end of the housing.

In the injector, a guide ring is arranged in the front end of the shell, the peripheral surface of the guide ring is connected with the peripheral wall of the movable space through a plurality of support arms, a space is reserved between the guide ring and the peripheral wall of the movable space, and at least one guide lug is arranged on the inner ring wall of the guide ring; the screw body of the metering screw is provided with at least one axial guide groove which passes through the screw thread part and is parallel to the central shaft, and the axial guide groove is matched with the guide lug in the guide ring of the shell.

In the syringe, the front end face of the non-return ratchet spring is provided with a wing which protrudes forwards, and the conical curved surface of the oblique button contacts with the wing of the non-return ratchet spring, so that the conical curved surface of the oblique button can push the non-return ratchet spring to engage with the unidirectional ratchet part of the shell through the wing.

In the syringe as described above, the syringe includes a cartridge case having a receiving space penetrating in a direction along the central axis, the cartridge case is detachably assembled with the medicament bottle, the front end of the cartridge case is detachably assembled with the needle member, the cartridge case is assembled with the front end of the housing of the injection mechanism, and the cartridge case can trigger the bias sheet Niu Chaohou to move to drive the plurality of ratchet latches to engage the unidirectional ratchet portion of the housing in the injection mode, and when the cartridge case is detached from the front end of the housing of the injection mechanism, the bias sheet Niu Neng moves forward to disengage the ratchet latches from the unidirectional ratchet portion of the housing in the standby mode.

In the syringe as described above, the inner peripheral wall of the housing has at least one helical guide; the spiral pushing component comprises a driving screw tube, a clutch sleeve and an output button; wherein:

the driving screw pipe can be spirally arranged in the movable space of the shell, a screw pipe channel penetrating along the direction of the central shaft is arranged in the driving screw pipe, a guide curved surface inclined towards the central shaft from back to front is formed at the front end section of the screw pipe channel, a driving screw guide groove is formed on the peripheral wall of the driving screw pipe, the driving screw guide groove is in screw joint with the screw guide strip of the shell, the rear end of the driving screw pipe is provided with a screw pipe rear end part, the screw pipe rear end part extends out of the rear end of the shell, and the screw pipe rear end part can be limited by the rear end of the shell;

The clutch sleeve is arranged in the screw channel of the driving screw in a penetrating way and can move linearly relative to the driving screw, the clutch sleeve comprises a sleeve body, a plurality of elastic buckling claws arranged at the front end of the sleeve body and a group of connecting end parts arranged at the rear end of the sleeve body, the sleeve body is internally provided with a sleeve channel extending along the direction of the central shaft, the peripheral wall of the sleeve channel is provided with at least one sleeve guide groove part parallel to the central shaft, the elastic buckling claws are provided with elasticity capable of expanding and contracting radially, when the clutch sleeve moves forwards relative to the driving screw, the elastic buckling claws can push and retract radially for the guide curved surface of the front end of the driving screw, and the elastic buckling claws can rebound back to the original position along the guide curved surface to expand;

the output button is positioned at the rear outer side of the shell and pivoted with the assembling end part of the rear end of the clutch sleeve;

the metering guide sleeve penetrates through the driving screw pipe and the clutch sleeve, and can clamp a plurality of elastic buckling claws of the clutch sleeve;

the outer peripheral surface of the total amount control nut is provided with at least one flange which is matched with the sleeve guide groove part of the clutch sleeve.

In the syringe, the inner side surface of the elastic buckling claw is a buckling surface, and the buckling surface is provided with a plurality of straight stripes extending along the front-back direction; the outer peripheral surface between the front end part of the guide sleeve and the threaded part of the guide sleeve forms a joint surface, the joint surface is provided with a plurality of straight stripes parallel to the central shaft, and the straight stripes of the joint surface are matched with the straight stripes of the buckling surface of the elastic buckling claw.

In the syringe as described above, the rear section of the peripheral wall of the housing is provided with a scale viewing window, the peripheral wall of the driving screw forms a spiral scale portion parallel to the driving screw guide groove, the spiral scale portion has a plurality of scale marks, and the scale marks of the spiral scale portion can be displayed through the scale viewing window of the housing.

The invention has the beneficial effects that when the injector is used, the injection mechanism can be connected with a medicament bottle at the front end of the injector, and the injection mechanism can be manually triggered to execute the conversion between the injection mode and the standby mode through the integral structure of the injector, wherein when the oblique button of the injection mechanism is triggered to move backwards, the plurality of non-return ratchet buckles can be driven to engage with the one-way ratchet part of the shell to be in the injection mode, so that the injector has a function of quantitatively outputting medicament liquid for a plurality of times, all medicament liquid in the medicament bottle assembled at the front end of the injection mechanism is used up, the medicament bottle is taken down, the injection mechanism can manually trigger the oblique button Niu Chaoqian to move, so that the non-return ratchet buckles are separated from the one-way ratchet part of the shell to be in the standby mode, the metering screw can be directly manually pushed backwards to be in place, the metering guide sleeve is driven to reversely rotate, and the total quantity control nut is pushed backwards to the initial full-quantity position of the metering guide sleeve, so that the injector can be reused.

The injector of the invention can further use the cartridge sleeve to execute the conversion between the injection mode and the standby mode as a trigger element, the cartridge sleeve has the functions of installing a medicament bottle and assembling a needle component, when the cartridge sleeve is sleeved at the front end of the shell of the injection mechanism, the inclined sheet Niu Chaohou can be automatically pushed to move so as to drive the plurality of non-return ratchet buckles to engage with the one-way ratchet wheel part of the shell to be in the injection mode, and when the cartridge sleeve is detached from the front end of the shell of the injection mechanism, the inclined sheet Niu Neng moves forwards so that the non-return ratchet wheel buckles are separated from the one-way ratchet wheel part of the shell to be in the standby mode.

The injector of the invention can further lead the front end of the shell to be internally provided with a guide ring, the guide ring and the peripheral wall of the movable space are provided with a space, and the guide ring is provided with at least one guide lug on the inner annular wall thereof; the screw body of the metering screw is provided with an axial guide groove which passes through the screw thread part and is parallel to the central shaft, and the axial guide groove is matched with the guide lug in the guide ring of the shell, so that when all medicament liquid in the medicament bottle is used up, a user removes the cartridge sleeve and the medicament bottle in the cartridge sleeve from the front end of the shell, when the non-return ratchet wheel of the metering guide sleeve is elastically buckled and separated from the non-return ratchet wheel part of the shell to release the non-return function of the non-return ratchet wheel, the axial guide groove of the metering screw can be positioned at the position of the guide lug in the guide ring of the aligned shell, the metering screw which originally extends out of the shell can be directly and quickly pushed back to the original position along the direction of the central shaft, the metering guide sleeve is driven to reversely rotate, and the total quantity control nut is pushed back to the initial full-quantity position of the metering guide sleeve along the direction of the central shaft, and the convenience of use is improved.

The injector of the invention can further lead the spiral pushing component to comprise a driving screw tube, a clutch sleeve and an output button; the clutch sleeve is arranged at the front end of the sleeve body of the clutch sleeve, the plurality of elastic buckling claws are provided with elasticity which radially expands and contracts inwards, when the clutch sleeve moves forwards relative to the drive screw, the plurality of elastic buckling claws can push the guide curved surface at the front end of the drive screw to radially retract and clamp the metering guide sleeve, so that the metering guide sleeve, the clutch sleeve and the drive screw can rotate together, and the plurality of elastic buckling claws can rebound backwards along the guide curved surface to expand and release the metering guide sleeve in situ, thereby ensuring that the clutch between the metering guide sleeve and the spiral pushing component has good action smoothness and accuracy.

The syringe of the invention can further be provided with a scale viewing window on the peripheral wall of the shell, the peripheral wall of the driving screw forms a spiral scale part parallel to the driving spiral guide groove, the spiral scale part is provided with a plurality of scale marks, and the scale marks of the spiral scale part can be displayed through the scale viewing window of the shell, so that the driving screw can have the driving and dose scale representing functions by a single component.

Drawings

The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention. Wherein:

fig. 1 is an exploded view of a preferred embodiment of the present invention syringe using a cartridge housing as a trigger element with a medicament vial, needle assembly, etc.

Fig. 2 is a schematic side cross-sectional view of the cartridge housing of the preferred embodiment of the syringe of fig. 1 after assembly of a vial, without the injection mechanism assembled.

Fig. 3 is an exploded perspective view of the injection mechanism shown in fig. 1 and 2.

Fig. 4 is an exploded isometric view of the injection mechanism of fig. 1 and 2 at another viewing angle.

Fig. 5 is a schematic plan view of the housing of the injection mechanism of fig. 3 and 4.

Fig. 6 is a schematic plan view of the injection mechanism of fig. 3 and 4.

Fig. 7 is a schematic cross-sectional view of the position of the cutting line A-A shown in fig. 6.

FIG. 8 is a schematic cross-sectional view of the section line B-B shown in FIG. 6.

Fig. 9 is a perspective view of the injection mechanism of fig. 3 and 4 with the housing removed.

Fig. 10 is another perspective view of the injection mechanism of fig. 3 and 4 with the housing removed.

Fig. 11 is a partial perspective view of the combination of the clutch sleeve and the metering sleeve in the injection mechanism of fig. 3 and 4.

Fig. 12 is a schematic cross-sectional front view of the combination of the housing and metering sleeve of the injection mechanism of fig. 3 and 4.

Fig. 13 is a view showing an injection mechanism in which a cartridge sleeve of the preferred embodiment of the syringe shown in fig. 1 is not assembled after a medicine bottle is assembled.

Fig. 14 is a view showing the preferred embodiment of the syringe of fig. 13, showing the cartridge housing assembly with the vial and the injection member disposed at the front end of the injection mechanism.

Fig. 15 is a view of the screw drive assembly of the injection mechanism of fig. 14 shown in an embodiment with the screw drive assembly pulled rearwardly from the rear end of the housing.

Fig. 16 is a reference view showing an embodiment of the injection mechanism of fig. 15 in which the screw pushing assembly is pushed forward to perform a medicine liquid output injection operation.

Fig. 17 is a reference diagram showing an embodiment of the injection mechanism shown in fig. 16 in which the injection operation for outputting the medicine liquid is completed once.

Fig. 18 is a view of the screw pushing assembly of the injection mechanism of fig. 17 again shown in an embodiment pulled back from the rear end of the housing.

Fig. 19 is a schematic plan view of the syringe of the present invention after injection of all of the medicinal fluid in the vial.

Fig. 20 is a reference view showing an embodiment of the syringe of fig. 19 in which a medicine bottle in an empty state and a cassette case outside the medicine bottle are detached from the front end of an injection mechanism.

Fig. 21 is a schematic plan view of the injection mechanism of fig. 20 with the metering screw pushed back to return the injection mechanism to the initial state.

The reference numerals simply illustrate:

A. a central shaft; 1. a cassette sleeve; 10. a cartridge body; 100. an accommodating space; 11. a needle head combining part; 12. a connection part; 13. a limit flange; 14. a viewing window; 15. clamping the convex particles; 2. an injection mechanism; 20. a housing; 200. a movable space; 21. a cartridge case coupling part; 211. an L-shaped clamping groove; 22. a guide ring; 221. a guide projection; 23. a one-way ratchet part; 24. a support arm; 25. a spiral guide bar; 26. a scale viewing window; 2A, a spiral pushing component; 30. driving the screw; 31. a solenoid passage; 32. a guide curved surface; 33. driving the spiral guide groove; 34. the rear end of the spiral tube; 35. a spiral scale section; 40. a clutch sleeve; 41. a sleeve body; 42. elastic buckling claws; 421. a buckling surface; 43. assembling end parts; 44. a cannula passageway; 45. a sleeve guide groove portion; 50. an output button; 60. metering guide sleeve; 61. a guide sleeve body; 62. a non-return ratchet spring buckle; 621. a fin; 63. a guide sleeve middle hole; 64. the front end part of the guide sleeve; 65. a spiral part; 66. a guide sleeve threaded portion; 67. a joint surface; 70. a total control nut; 71. a flange; 80. slope Zhang Niu; 81. an inner bore; 82. conical curved surface; 90. a metering screw; 91. a screw body; 92. a screw front end portion; 93. a screw thread portion; 94. an axial guide groove; 3. a medicament bottle; 3A, needle parts; 3B, a needle sheath; 3C, a piston; 4. and (3) protecting the cover.

Detailed Description

The technical means adopted by the present invention to achieve the intended purpose will be further described below with reference to the accompanying drawings and preferred embodiments of the present invention.

Referring to fig. 1 and 2, according to the description of the present invention, the syringe of the present invention can be assembled with a medicine bottle 3 containing medicine liquid and a needle member 3A connected to the front end of the medicine bottle 3, providing an apparatus for performing the injection function of medicine liquid. The medicine bottle 3 and the needle device 3A are both known articles, and the medicine bottle 3 is internally provided with a piston 3C for pushing and extruding the medicine liquid to output.

As shown in fig. 1 and 2, the injector of the present invention mainly comprises an injection mechanism 2, wherein the injection mechanism 2 has an injection mode and a standby mode, and the injection mechanism 2 can be directly manually triggered by a user or indirectly manually triggered by a trigger element to perform the conversion between the injection mode and the standby mode.

In the preferred embodiment shown in fig. 1 and 2, the injector uses a cartridge 1 as a trigger element for changing modes of the injection mechanism 2, and the injection mechanism 2 is triggered to change from the standby mode to the injection mode by the cartridge 1 engaging the front end of the injection mechanism 2, and the injection mechanism 2 can automatically change to the standby mode when the cartridge 1 is detached from the front end of the injection mechanism 2. However, in the syringe of the present invention, the trigger element for triggering the mode change of the injection mechanism 2 is not limited to the cartridge 1.

In order to facilitate the specific structural description of the injector of the present invention, the preferred embodiment of fig. 1 and 2 will be described below. The injector of the present invention defines a central axis a extending axially back and forth, and the injection mechanism 2 includes a housing 20, a screw drive assembly 2A, a metering guide 60, a total metering nut 70, a tilt button 80, and a metering screw 90. The construction of each of the foregoing components is described below separately.

As shown in fig. 1 to 5 and fig. 6 to 8, the housing 20 has a movable space 200 penetrating along the central axis a, a unidirectional ratchet portion 23 is formed in the movable space 200 of the housing 20, the unidirectional ratchet portion 23 has a plurality of unidirectional ratchet teeth, the plurality of unidirectional ratchet teeth are rotationally symmetrically arranged relative to a predetermined forward rotation direction of the central axis a, and the front end of the housing 20 is detachably connected to the medicine bottle 3.

As shown in fig. 1 to 5 and fig. 6 to 8, a guide ring 22 is further disposed in the movable space 200 of the housing 20 opposite to the front of the unidirectional ratchet portion 23, and a space is provided between the guide ring 22 and the peripheral wall of the movable space 200. In the preferred embodiment, the outer peripheral surface of the guide ring 22 is connected to the peripheral wall of the movable space 200 through a plurality of arms 24, so that a predetermined distance is maintained between the guide ring 22 and the peripheral wall of the movable space 200, and at least one guide protrusion 221 is disposed on the inner peripheral wall of the guide ring 22. In the preferred embodiment, two guiding protrusions 221 are disposed in the inner wall of the guiding ring 22 and are radially symmetrical with respect to the central axis a. The housing 20 is provided with one or more helical guides 25 at the rear Duan Zhoubi of the movable space 200.

As shown in fig. 2 to 4 and fig. 6 to 10, the screw pushing assembly 2A is disposed in the movable space 200 of the housing 20 to be capable of moving in a screw manner along the central axis a direction, and the screw pushing assembly 2A protrudes out of the rear end of the housing 20 and can be pressed to generate a screw pushing force. In the preferred embodiment, the screw pushing assembly 2A includes a drive screw 30, a clutch sleeve 40 and an output knob 50.

As shown in fig. 2 to 4 and fig. 6 to 10, the driving screw 30 is disposed in the movable space of the housing 20 in a spiral manner, a screw channel 31 penetrating along the central axis a is formed in the driving screw 30, and a front end section of the screw channel 31 forms a guiding curved surface 32 inclined from back to front toward the central axis a, i.e. the front end section of the driving screw 30 is formed with a curved surface shape with decreasing caliber from back to front. The outer peripheral wall of the driving screw 30 forms a driving screw guide 33, the pitch of the driving screw guide 33 is set according to the dosage of the injection medicine liquid scheduled by the injector, the driving screw guide 33 is screwed with the screw guide 25 in the shell 20, the rear end of the driving screw 30 is provided with a screw rear end 34 with a larger outer diameter, the screw rear end 34 extends out of the rear end of the shell 20, and the screw rear end 34 can be limited by the rear end of the shell 20 to limit the moving travel.

As shown in fig. 3 and 4, a scale viewing window 26 is disposed on the peripheral wall of the housing 20, a spiral scale portion 35 parallel to the driving spiral guide groove 33 is formed on the peripheral wall of the driving screw 30, the spiral scale portion 35 has a plurality of scale marks (not shown), and the scale marks of the spiral scale portion 35 can be displayed through the scale viewing window 26 of the housing 20, so that the driving screw 30 has both driving and dose scale displaying functions.

As shown in fig. 2 to 4 and fig. 6 to 8, the clutch sleeve 40 is inserted into the coil passage 31 of the driving coil 30 and can move linearly with respect to the driving coil 30. The clutch sleeve 40 comprises a sleeve body 41, a plurality of elastic locking claws 42 arranged at the front end of the sleeve body 41, and a group of connecting ends 43 arranged at the rear end of the sleeve body 41, wherein a sleeve channel 44 extending from front to back along the central axis A is formed in the sleeve body 41, the peripheral wall of the sleeve channel 44 is provided with at least one sleeve guiding groove 45 parallel to the central axis, the plurality of elastic locking claws 42 have elasticity of radial expansion and contraction, and when the clutch sleeve 40 moves forwards relative to the driving screw 30, the plurality of elastic locking claws 42 can push and retract radially for the guiding curved surface 32 at the front end of the driving screw 30 and can rebound backwards to be in situ to expand along the guiding curved surface 32. In the preferred embodiment, the inner side surface of the elastic latch 42 is a latch surface 421, and the latch surface 421 has a plurality of straight stripes extending along the front-rear direction.

The output button 50 is located outside the rear end of the housing 20, and the output button 50 is pivotally connected to the assembling end 43 of the rear end of the clutch sleeve 40, and the output button 50 is used for providing a user operation means.

As shown in fig. 2 to 4 and fig. 6 to 11, the metering guide sleeve 60 is pivoted in the housing 20 in a fixed-point rotating manner, and is inserted into the driving screw 30 and the clutch sleeve 40, and can selectively clamp the plurality of elastic locking claws 42 of the clutch sleeve 40, when the guiding curved surface 32 of the driving screw 30 drives the elastic locking claws 42 of the clutch sleeve 40 to clamp the metering guide sleeve 60, the clutch sleeve 40 and the driving screw 30 can rotate together, the metering guide sleeve 60 comprises a guide sleeve body 61 and a plurality of non-return ratchet elastic buckles 62, the guide sleeve body 61 has a guide sleeve middle hole 63 penetrating along the central axis a, the guide sleeve body 61 has a guide sleeve front end 64, the guide sleeve front end 64 is pivoted in the guide ring 22 of the housing 20, the guide sleeve middle hole 63 is located on the inner peripheral wall of the section of the guide sleeve front end 64 and has at least one spiral portion 65, the rear section outer peripheral surface of the guide sleeve body 61 forms a thread 66, and the guide sleeve thread 66 is smaller than the driving screw pitch 33 of the guide groove 30 of the driving screw. The guide sleeve body 61 forms a joint surface 67 on the outer peripheral surface between the guide sleeve front end 64 and the guide sleeve threaded portion 66, the joint surface 67 has a plurality of straight stripes parallel to the central axis a, the straight stripes of the joint surface 67 are matched with the straight stripes of the fastening surface 421 of the elastic fastening claw 42, the plurality of non-return ratchet latches 62 are formed on the outer side surface of the guide sleeve front end 64, the plurality of non-return ratchet latches 62 are curved and are rotationally symmetrically arranged relative to the predetermined forward rotation direction of the central axis a, and the plurality of non-return ratchet latches 62 can be controlled to be engaged with the non-return ratchet portion 23 of the housing 20. When the non-return ratchet spring 62 engages the one-way ratchet portion 23 of the housing 20, the metering guide 60 can only be driven to rotate forward but not in reverse, i.e., in the injection mode, and when the non-return ratchet spring 62 disengages from the one-way ratchet portion 23 of the housing 20, i.e., the non-return function is released, the metering guide 60 can freely rotate forward or in reverse, i.e., in the standby mode. In the preferred embodiment, the front end of the ratchet latch 62 has a tab 621 projecting forward.

As shown in fig. 2 to 4 and fig. 6 to 8, the total amount control nut 70 is disposed in the screw channel 31 of the driving screw 30 to move linearly along the direction of the central axis a, and the total amount control nut 70 is screwed to the metering guide 60, and the total length of the distance that the total amount control nut 70 can move on the guide screw portion 66 of the metering guide 60 corresponds to the distance that the piston 3C in the medicine bottle 3 can move, so as to control the total amount of medicine liquid that can be output from the medicine bottle 3. In the preferred embodiment, the total amount control nut 70 has an inner screw hole therein, and is screwed to the guide screw portion 66 at the rear section of the guide body 61 of the metering guide 60, and the outer circumferential surface of the total amount control nut 70 has a flange 71, and the flange 71 is matched with the sleeve guiding groove 45 in the sleeve passage 44 of the clutch sleeve 40.

As shown in fig. 2 to 4 and fig. 6 to 10, the oblique knob 80 is movably disposed in the front end of the housing 20 along the direction of the central axis a, and the oblique knob 80 can be driven to change the clutch state of the non-return ratchet buckle 62 relative to the one-way ratchet portion 23 of the housing 20 so as to change the injection mode and the standby mode.

In the preferred embodiment, the oblique knob 80 is installed in the box engaging portion 21 at the front end of the housing 20, and the oblique knob 80 passes through the space between the peripheral wall of the movable space 200 at the front end of the housing 20 and the outer periphery of the guide ring 22, the oblique knob 80 has an inner hole 81 passing through along the central axis a, and the oblique Zhang Niu has a conical curved surface 82 with increasing back-to-front dimension, the rear section of the conical curved surface 82 contacts with the tab 621 of the non-return ratchet buckle 62, when the oblique knob 80 is forced to displace backwards, the oblique knob 80 can drive the non-return ratchet buckle 62 of the metering guide sleeve 60 to expand radially by the thrust of the conical curved surface 82, so that the non-return ratchet buckle 62 is engaged with the non-return ratchet portion 23 of the housing 20. When the oblique button 80 is not stressed, the non-return ratchet spring 62 can be separated from the unidirectional ratchet portion 23 of the housing 20 by the elastic folding of the non-return ratchet spring, and can push the conical curved surface 82 of the oblique button 80 to enable the oblique Zhang Niu to move forward for resetting.

As shown in fig. 2 to 4 and fig. 6 to 10, the metering screw 90 is disposed through the oblique knob 80 and the guide ring 22 of the housing 20, and the metering screw 90 is disposed in the metering guide sleeve 60 and can be driven to move linearly along the direction of the central axis a, the metering screw 90 includes a screw body 91 and a screw front end 92 disposed at the front end of the screw body 91, the screw body 91 has a screw thread portion 93 on its outer circumferential surface, and has at least one axial guide groove 94 parallel to the central axis a through the screw thread portion 93, the screw thread portion 93 is in threaded engagement with the screw portion 65 in the guide sleeve front end 64 of the metering guide sleeve 60, the axial guide groove 94 is engaged with the guide protrusion 221 in the guide ring 22 of the housing 20, the screw front end 92 is disposed in front of the guide ring 22 of the housing 20 and in front of the oblique Zhang Niu, so that the screw motion of the metering guide sleeve 60 can drive the metering screw 90 to move linearly along the direction of the central axis a in the housing 20 for pushing the piston 3C in the medicine bottle 3 to perform the quantitative output of the medicine liquid, and when the injection mechanism 2 is in the direction of the central axis a is extended out of the housing 20 to the front end of the housing 20.

When the injector of the present invention uses the cartridge 1 as a trigger element for changing modes of the injection mechanism 2, as shown in fig. 1 to 2, the cartridge 1 can accommodate the medicine bottle 3 and is provided with the needle member 3A connected to the medicine bottle 3, and can be detachably connected to the injection mechanism 2. In the preferred embodiment, the cartridge case 1 has a receiving space 100 penetrating along the direction of the central axis a, the cartridge case 1 includes a case body 10, the front end of the case body 10 has a needle combining portion 11, the rear end of the case body 10 has a connecting portion 12, the receiving space 100 forms openings at the front end and the rear end of the cartridge case 1, the medicine bottle 3 is detachably mounted in the receiving space of the cartridge case 1 for positioning, the needle component 3A is detachably sleeved on the needle combining portion 11, and the connecting portion 12 at the rear end of the case body 10 is detachably connected with the injection mechanism 2.

As shown in fig. 1 to 5 and fig. 6 to 8, in the preferred embodiment, the outer peripheral surface of the needle combining portion 11 is provided with threads, the needle member 3A is screwed to the needle combining portion 11, and the peripheral wall of the cartridge body 10 has a limit flange 13 at the front end of the connecting portion 12. The peripheral wall of the cartridge body 10 may further be provided with one or more viewing windows 14 communicating with the accommodating space 100 for a user to view the medicament liquid volume of the medicament bottle 3 located in the cartridge 1.

As shown in fig. 1 to 5 and fig. 6 to 8, the front end of the housing 20 has a cartridge coupling portion 21, the connecting portion 12 at the rear end of the cartridge 1 is detachably connected to the cartridge coupling portion 21 of the housing 20, the combined structure between the cartridge coupling portion 21 at the front end of the housing 20 and the connecting portion 12 at the rear end of the cartridge 1 can be a combined structure such as a clamping connection or a screwing connection, in the preferred embodiment, the combined structure between the cartridge coupling portion 21 at the front end of the housing 20 and the connecting portion 12 at the rear end of the cartridge 1 is disclosed, wherein a plurality of clamping beads 15 are formed on the outer peripheral surface of the connecting portion 12 at the rear end of the cartridge 1, a plurality of L-shaped clamping grooves 211 are formed on the inner peripheral wall of the cartridge coupling portion 21 at the front end of the housing 20, the L-shaped clamping grooves 211 comprise a straight groove section parallel to the central axis a and a transverse section connected to the rear end of the groove section, so that the connecting portion 12 at the rear end of the cartridge 1 is positioned in the front end of the housing 20, namely, the clamping beads are positioned in the front end of the housing 1, and the clamping beads are positioned in the transverse direction along the straight groove 211, and then clamped in the front end of the connecting portion 15.

As shown in fig. 1, the syringe may further comprise a protecting cover 4, wherein the protecting cover 4 can be sleeved outside the cartridge 1 containing the medicine bottle 3 and the needle component 3A to protect the medicine bottle 3 containing the needle component, and the needle component 3A may also be sleeved with a needle protecting cover 3B to prevent the needle from exposing, so as to ensure the use safety.

Regarding the use of the syringe of the present invention, taking the preferred embodiment of the syringe shown in fig. 1 and 2 as an example, please refer to fig. 13 and 14 in combination with fig. 6 to 8 and 12, after the medicine bottle 3 with full dose of medicine liquid is mounted on the cartridge case 1, the connecting portion 12 at the rear end of the cartridge case 1 is placed into the case engaging portion 21 at the front end of the housing 20 of the injection mechanism 2 to be combined, and the limit flange 13 of the cartridge case 1 abuts against the front end of the housing 20 to limit, and the rear end of the cartridge case 1 is used to push the oblique knob 80 to move backward, so that the conical curved surface 82 of the oblique knob 80 is used to push the non-return ratchet snap 62 of the metering guide sleeve 60 to expand radially and engage with the non-return ratchet portion 23 of the housing 20 to be in the injection mode, and the metering setting mode of the syringe is started.

As shown in fig. 15 and 16, in combination with fig. 6 to 8, when the needle component 3A is mounted on the front end of the cartridge sleeve 1, the user presses the output button 50 on the rear end of the spiral pushing component 2A, and pushes the clutch sleeve 40 forward through the output button 50, when the elastic locking claw 42 on the front end of the clutch sleeve 40 is pushed by the guiding curved surface 32 on the front end of the driving coil 30, the elastic locking claw 42 receives and clamps the metering guide sleeve 60, so that the driving coil 30, the clutch sleeve 40 and the metering guide sleeve 60 rotate in the same direction, wherein, through the spiral structure of the driving spiral guide groove 33 on the outer peripheral surface of the driving coil 30 of the spiral pushing component 2A and the spiral guide strip 25 on the inner peripheral wall of the housing 20, when the driving coil 30 advances forward in the housing 20, the rotation number of the driving coil 30 is equal to the rotation number of the driving total amount regulating nut 70 of the clutch sleeve 40 on the metering guide sleeve 60, the metering guide sleeve 60 is pushed and limited by the inclined Zhang Niu, so that the counter ratchet elastic locking 62 of the expanding of the metering guide sleeve 60 is pushed and limited by the inclined Zhang Niu, the counter ratchet elastic locking 62 of the metering guide sleeve 60 is meshed with the ratchet wheel 23 of the housing 20, and the metering liquid is only pushed forward in the housing 20, and the metering liquid is metered in the housing 20 is metered, and the liquid is metered and then metered in the liquid is pushed forward in the housing, and the liquid is only in the metering piston 90, and the metering liquid is metered, and the liquid is only in the metering case is in the housing, and is in the metering case.

As shown in fig. 17 and fig. 18 in combination with fig. 6 to fig. 8, after the user completes one dose output injection action, the output button 50 at the rear end of the screw pushing assembly 2A is released, the elastic locking claw 42 at the front end of the clutch sleeve 40 is guided by the guiding curved surface 32 at the front end of the driving screw 30, the clutch sleeve 40 can rebound backwards, and the elastic locking claw 42 is opened to release the metering guide sleeve 60, so that the screw pushing assembly 2A can be pulled backwards to execute the injection action of the next dose output.

As shown in fig. 19 to 21 in combination with fig. 6 to 8, when the medicine bottle 3 is used up a plurality of times, the user removes the cassette housing 1 and the medicine bottle 3 therein from the front end of the housing 20, at this time, the force applied to the tilt button 80 by the original cassette housing 1 is removed, the tilt button 80 is pushed back forward by the restoring force of the retraction of the ratchet spring 62 of the metering guide sleeve 60, the metering guide sleeve 60 releases its reverse stop function due to the release of the ratchet spring 62 from the one-way ratchet portion 23 of the housing 20, and is shifted to the standby mode, at this time, the axial guide groove 94 of the metering screw 90 is located at the position of the guide protrusion 221 in the guide ring 22 of the alignment housing 20, the metering screw 90 that is originally extended out of the housing 20 is pushed back to the original position directly along the direction of the central axis, and the total amount control nut 70 is pushed back to the initial full position of the metering guide sleeve 60 along the direction of the central axis a by the metering guide sleeve 60. Thus, the syringe can be reused.

The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matter of the present invention can be made by those skilled in the art without departing from the scope of the technical scheme of the present invention.

Claims

1. A syringe capable of detachably coupling a medicine bottle having a medicine liquid and a needle assembly connected to a front end of the medicine bottle, characterized in that: the injector defines a central axis extending axially back and forth and includes an injection mechanism having an injection mode and a standby mode, and the injection mechanism is manually triggerable to perform a change of the injection mode and the standby mode, the injection mechanism comprising:

A housing having a movable space penetrating in a direction along the central axis, the front end of the housing being detachably connected to the medicine bottle, the front peripheral wall of the movable space of the housing forming a one-way ratchet portion;

the metering guide sleeve is rotatably arranged in the shell at fixed points, penetrates through the spiral pushing assembly and can be controlled to rotate together with the spiral pushing assembly, the metering guide sleeve comprises a guide sleeve body and a plurality of non-return ratchet buckles, the guide sleeve body is internally provided with a guide sleeve middle hole and at least one spiral part positioned on the inner peripheral wall of the guide sleeve middle hole, the outer peripheral surface of the rear section of the guide sleeve body forms a guide sleeve threaded part, the front end of the guide sleeve body is provided with a guide sleeve front end part, the non-return ratchet buckles are formed on the outer side surface of the guide sleeve front end part, when the non-return ratchet buckles are controlled to engage with the unidirectional ratchet part of the shell, the metering guide sleeve can only be driven to rotate forward to be in the injection mode, and when the non-return ratchet buckles are separated from the unidirectional ratchet part of the shell, the metering guide sleeve can rotate forward and backward to be in the standby mode;

A total amount control nut which is arranged in the spiral pushing assembly in a linear motion along the direction of the central shaft and is in threaded connection with a guide sleeve threaded part at the rear section of the metering guide sleeve;

a tilt button movably installed in the front end of the housing along the direction of the central axis, wherein the tilt Zhang Niuneng is driven to change the clutch state of the non-return ratchet spring relative to the non-return ratchet part of the housing so as to change the injection mode and the standby mode; and

the metering screw rod is arranged in the inclined Zhang Niu and the shell in a penetrating way, the metering screw rod is arranged in the metering guide sleeve in a threaded way, the metering screw rod comprises a screw rod body with a screw thread part, the screw rod body is in threaded fit with the screw part in the metering guide sleeve through the screw thread part, the front end of the screw rod body extends out of the front of the inclined Zhang Niu, when the injection mechanism is in an injection mode, the screw movement of the metering guide sleeve can drive the metering screw rod to linearly move in the shell along the direction of the central shaft so as to perform quantitative output of the medicament liquid of the medicament bottle, when the injection mechanism is in a standby mode, the inverted ratchet snap of the metering guide sleeve is separated from the unidirectional ratchet part of the shell, the metering screw rod can be retracted to the original position in the shell in a backward linear movement way along the central shaft and drive the metering guide sleeve to reversely rotate, and the total quantity control nut is pushed back to the initial metering full-dose position of the metering guide sleeve so that the syringe can be assembled again and reused.

2. The syringe of claim 1 including a cartridge housing having a receiving space therethrough in the direction of said central axis, said cartridge housing removably receiving said medicament vial and said front end removably receiving said needle assembly, said cartridge housing removably receiving the front end of the housing of said injection mechanism, said cartridge housing being adapted to trigger said rearward movement of said ramp Zhang Niu and to cause a plurality of said ratchet latches to engage said one-way ratchet portion of said housing in said injection mode, and upon removal of said cartridge housing from the front end of the housing of said injection mechanism, said ramp Zhang Niuneng moves forward to disengage said ratchet latches from said one-way ratchet portion of said housing in said standby mode.

3. The syringe of claim 2, wherein the cartridge case comprises a case body, at least one viewing window is provided on a peripheral wall of the case body, a connecting portion is provided at a rear end of the case body, a limit flange is provided at a front end of the connecting portion on the peripheral wall of the case body, a plurality of clamping beads are formed on an outer peripheral surface of the connecting portion, a case coupling portion is provided at a front end of the housing, a plurality of L-shaped clamping grooves are formed on an inner peripheral wall of the case coupling portion, the L-shaped clamping grooves comprise a straight groove section parallel to the central axis and a transverse section connected to a rear end of the straight groove section, and when the connecting portion of the rear end of the cartridge case is placed in the case coupling portion of the front end of the housing, the clamping beads can move along the straight groove section of the L-shaped clamping grooves and then be screwed into the end of the transverse section to position the case coupling portion so that the cartridge case is positioned at the front end of the housing.

4. The injector according to claim 1, wherein a guide ring is provided in the front end of the housing, the outer circumferential surface of the guide ring is connected to the circumferential wall of the movable space by a plurality of arms, a space is provided between the guide ring and the circumferential wall of the movable space, and at least one guide projection is provided on the inner circumferential wall of the guide ring; the screw body of the metering screw is provided with at least one axial guide groove which passes through the screw thread part and is parallel to the central shaft, and the axial guide groove is matched with the guide lug in the guide ring of the shell.

5. The syringe of claim 4 wherein the front face of the backstop ratchet latch has a tab projecting forward, the conical surface of the bevel Zhang Niu contacting the tab of the backstop ratchet latch such that the conical surface of the bevel Zhang Niu can push the backstop ratchet latch through the tab to engage the unidirectional ratchet portion of the housing.

6. The syringe of claim 5, including a cartridge housing having a receiving space therethrough in the direction of the central axis, the cartridge housing removably receiving the vial and the front end of the cartridge housing removably receiving the needle assembly, the cartridge housing being mounted to the front end of the housing of the injection mechanism and the cartridge housing being operable to trigger rearward movement of the ramp Zhang Niu to bring the plurality of ratchet latches into engagement with the one-way ratchet portion of the housing in the injection mode, the ramp Zhang Niuneng being operable to move forward to disengage the ratchet latches from the one-way ratchet portion of the housing in the standby mode when the cartridge housing is removed from the front end of the housing of the injection mechanism.

7. The syringe of claim 6, wherein the cartridge case comprises a case body, at least one viewing window is provided on a peripheral wall of the case body, a connecting portion is provided at a rear end of the case body, a limit flange is provided at a front end of the connecting portion on the peripheral wall of the case body, a plurality of clamping beads are formed on an outer peripheral surface of the connecting portion, a case coupling portion is provided at a front end of the housing, a plurality of L-shaped clamping grooves are formed on an inner peripheral wall of the case coupling portion, the L-shaped clamping grooves comprise a straight groove section parallel to the central axis and a transverse section connected to a rear end of the straight groove section, and when the connecting portion of the rear end of the cartridge case is placed in the case coupling portion of the front end of the housing, the clamping beads can move along the straight groove section of the L-shaped clamping grooves and then be screwed into the end of the transverse section to position the case coupling portion at the front end of the housing.

8. The syringe of any one of claims 1 to 7, wherein the inner peripheral wall of the housing has at least one helical guide; the spiral pushing component comprises a driving screw pipe, a clutch sleeve and an output button; wherein:

The driving screw is arranged in the movable space of the shell in a spiral movement way, a screw channel penetrating along the direction of the central shaft is arranged in the driving screw, a guide curved surface inclined towards the central shaft from back to front is formed at the front end region of the screw channel, a driving screw guide groove is formed on the peripheral wall of the driving screw, the driving screw guide groove is screwed with the screw guide strip of the shell, the rear end of the driving screw is provided with a screw rear end part, the screw rear end part extends out of the rear end of the shell, and the screw rear end part can be limited by the rear end of the shell;

the clutch sleeve is arranged in the screw channel of the driving screw in a penetrating way and can move linearly relative to the driving screw, the clutch sleeve comprises a sleeve body, a plurality of elastic buckling claws arranged at the front end of the sleeve body and a group of connecting end parts arranged at the rear end of the sleeve body, a sleeve channel extending along the direction of the central shaft is formed in the sleeve body, the peripheral wall of the sleeve channel is provided with at least one sleeve guiding groove part parallel to the central shaft, the elastic buckling claws have elasticity capable of being opened and contracted radially, when the clutch sleeve moves forwards relative to the driving screw, the elastic buckling claws can push and retract radially for a guiding curved surface at the front end of the driving screw, and the elastic buckling claws can be opened backwards and bounces back to an original position along the guiding curved surface;

the outer peripheral surface of the total amount control nut is provided with at least one flange, and the flange is matched with the sleeve guide groove part of the clutch sleeve.

9. The syringe of claim 8, wherein the inner side of the elastic locking claw is a locking surface, and the locking surface is provided with a plurality of straight stripes extending along the front-back direction; the guide sleeve body of the metering guide sleeve forms a joint surface on the outer peripheral surface between the front end part of the guide sleeve and the threaded part of the guide sleeve, the joint surface is provided with a plurality of straight stripes parallel to the central shaft, and the straight stripes of the joint surface are matched with the straight stripes of the buckling surface of the elastic buckling claw.

10. The syringe of claim 8, wherein the rear section of the peripheral wall of the housing is provided with a scale viewing window, the peripheral wall of the drive screw forms a spiral scale portion parallel to the drive screw guide groove, the spiral scale portion has a plurality of scale marks, and the scale marks of the spiral scale portion can be displayed through the scale viewing window of the housing.