CN115445030A - Drive piston group and switching mechanism for syringe - Google Patents

Abstract

The invention relates to a driving piston group and a switching mechanism of an injector, wherein the switching mechanism comprises the driving piston group and a switching connecting seat, a piston cylinder of the driving piston group is respectively connected with a medicament container filled with medicament liquid and a needle outlet mechanism with a needle group through an input one-way valve and an output one-way valve of a valve member, a piston rod arranged in the piston cylinder is detachably connected with the driving mechanism and can be driven by the driving mechanism, so that the switching mechanism is combined with the needle outlet mechanism to form an injection module, the needle group of the needle outlet mechanism can be punctured into a human body during injection, the driving mechanism drives the driving piston group to convey the medicament liquid in the medicament container to the needle group of the needle outlet mechanism to perform medicament liquid injection, the medicament container and the injection module adopt a disposable use mode and are discarded after use, the driving piston group of the switching mechanism can be externally connected with a combined structure of the driving mechanism, so that the driving mechanism can not contact with the medicament liquid during the medicament liquid injection, the driving mechanism can be repeatedly reused, and unnecessary material waste of the injector is reduced.

Description

Drive piston group and switching mechanism for syringe

The application is a divisional application of the original application of 'syringe', wherein the application date of the original application is 09, 25 and 2020, and the application number is 202011022142.

Technical Field

The invention relates to an injector applied to hypodermic injection of medicament liquid of a human body, in particular to a driving piston group in the injector and a conversion mechanism comprising the driving piston group.

Background

At present, the structure of an injector for injecting medicament liquid subcutaneously into a human body mainly uses an injection module which can be manually or electrically operated to be connected with a medicament container, so that the injection module can be used for injecting a needle group into the human body to carry out subcutaneous injection. In addition, when the hypodermic injection is carried out on the human body for a plurality of times by the existing injector, the discomfort of the human body caused by the plugging and unplugging of the needle head for a plurality of times is avoided, even if the injector uses the needle group comprising a soft needle and a hard needle, when the needle group is punctured into the human body, the soft needle is hard to directly puncture the human body because of the soft needle, so the human body is punctured with the form of the hard needle penetrating in the soft needle firstly, then the hard needle is pulled out from the soft needle, the injection module and the medicament container are connected with the soft needle for injection, and meanwhile, the soft needle can be left in the human body for a long time, so that the injection is carried out for a plurality of times.

The existing syringe is based on the safety standard of medicament liquid injection, although part of the existing syringes have the function of repeated use for a limited number of times. However, when the number of times of use of the conventional syringe is reached, the syringe needs to be discarded in the whole set, and the whole set of syringe is reused by the method of the original syringe. Furthermore, the prior injector adopts a fixed combination structure, the driving mechanism of the prior injector is directly connected with the injection module and can contact the injected medicament, and the prior injector is difficult to reuse part of the mechanism based on the safety and sanitation principles, so that further improvement is needed.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the utility model provides a drive piston group and shifter of syringe, solves current fixed syringe and uses the back, and because the material waste that the whole group of syringe of safety and sanitation need all to abandon to and the drive mechanism of current syringe can contact injection medicament, is difficult to the reuse scheduling problem.

The technical solution proposed by the invention is as follows: providing a driving piston group of an injector, which is used in the injector, wherein the driving piston group can be connected with a driving mechanism; wherein the content of the first and second substances,

the driving piston group comprises a piston cylinder, a valve element and a piston rod;

the piston cylinder is provided with a piston chamber, and one end of the piston cylinder is provided with a valve piece connecting end part;

the valve piece is arranged in the valve piece connecting end part of the piston cylinder, the valve piece is provided with an input one-way valve and an output one-way valve, the input one-way valve can only be opened towards the piston cylinder in one way, and the output one-way valve can only be opened towards the outside by the piston cylinder in one way;

the piston rod can be arranged in the piston cylinder in a linear motion way, and the piston rod can be connected with the driving mechanism in a detachable way.

In the above-mentioned driving piston assembly of the injector, the driving piston assembly can be installed in a conversion mechanism of the injector, and a medicament container containing medicament liquid and a needle outlet mechanism with a needle set are connected through the conversion mechanism, so that the driving mechanism can drive a piston rod in the piston cylinder to pump the medicament liquid in the medicament container to the needle outlet mechanism, and the needle set of the needle outlet mechanism performs medicament liquid injection.

In the above-mentioned driving piston assembly for an injector, at least one sliding slot is disposed in the inner wall of the piston cylinder, at least one sliding block is disposed on the outer circumferential surface of the piston rod, and each sliding block is disposed in the corresponding sliding slot for guiding the piston rod to move linearly in the piston cylinder.

In the above-mentioned driving piston assembly of the injector, the piston rod is a hollow rod member having at least one L-shaped engaging groove, and the piston rod can be connected with the driving mechanism in a rotational engaging manner, so that the piston rod can be driven by the driving mechanism.

The other technical solution proposed by the present invention is: the conversion mechanism of the injector is used in the injector and can be connected with a driving mechanism with a driving piece, wherein the conversion mechanism comprises a conversion connecting seat and a driving piston group arranged in the conversion connecting seat;

the conversion connecting seat comprises an input adapter and an output adapter;

the driving piston assembly comprises a piston cylinder, a valve element and a piston rod, wherein the piston cylinder is provided with a piston chamber, one end of the piston cylinder is provided with a valve element connecting end part, the valve element is mounted in the valve element connecting end part, the valve element is provided with an input one-way valve correspondingly connected with the input adapter and an output one-way valve correspondingly connected with the output adapter, the input one-way valve can be opened in one direction towards the piston cylinder only by the input adapter, and the output one-way valve can be opened in one direction towards the output adapter only by the piston cylinder; the piston rod can be arranged in the piston cylinder in a linear motion way, and the piston rod can be connected with the driving part of the driving mechanism in a detachable way.

In the above switching mechanism of the injector, the switching mechanism can combine with a needle discharging mechanism having a needle set to form an injection module, the input adapter of the switching mechanism can be connected to a medicament container containing medicament liquid, the output adapter can be connected to the needle discharging mechanism, the driving mechanism can drive the piston rod in the piston cylinder to pump the medicament liquid in the medicament container to the needle discharging mechanism, and then the needle set of the needle discharging mechanism performs medicament liquid injection.

In the above syringe conversion mechanism, at least one sliding slot is disposed in the inner wall of the piston cylinder, at least one sliding block is disposed on the outer circumferential surface of the piston rod, and each sliding block is disposed in a sliding slot corresponding to a position of the sliding slot, so as to guide the piston rod to move linearly in the piston cylinder.

In the above-mentioned switching mechanism of the syringe, the piston rod is a hollow rod member having at least one L-shaped engaging groove, and the piston rod can be connected with the driving mechanism in a rotational engaging manner, so that the piston rod can be driven by the driving mechanism.

In the switching mechanism of the syringe, the switching connecting seat further comprises a seat body and a valve seat part arranged on the seat body, the valve seat part is provided with a sleeving opening, the input adapter is arranged on one side, opposite to the sleeving opening, of the valve seat part, the output adapter is arranged in the seat body, and the input adapter and the output adapter are respectively communicated with the sleeving opening.

In the above syringe switching mechanism, the seat body has a connecting plate, two opposite sides of the connecting plate respectively form a clamping portion, and the connecting plate has a hook portion, so that the connecting plate can be clamped and combined with the needle discharging mechanism.

In the above-mentioned switching mechanism of the injector, the driving mechanism includes a housing, the driving member is installed in the housing, a sleeve pipe portion is provided at a side of the housing, the sleeve pipe portion is detachably sleeved outside the piston cylinder, and the driving member is installed in the sleeve pipe portion in a linear motion manner.

The invention has the advantages that the invention is constructed by the combination of the drive piston group and the conversion mechanism of the injector, the drive piston group is detachably connected with the drive mechanism and can be driven by the drive mechanism to deliver the medicament liquid in the medicament container to the needle group to perform medicament liquid injection, and the medicament container is detachably connected with the piston component by means of the connecting seat of the conversion mechanism so that 39493 is provided, the medicament liquid in the medicament container is delivered to the needle group to perform medicament liquid injection, so that the medicament container and the injection module which are safe and sanitary in the injector can be disassembled and discarded after use without repeated use, the combination of the conversion mechanism is adopted, the drive mechanism can not completely contact the medicament liquid in the medicament injection process, the drive mechanism of the injector can be reused, and unnecessary material waste is reduced.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:

fig. 1 is a schematic perspective view of a preferred embodiment of the switching mechanism of the present invention incorporating a drive piston assembly for use in an injector.

Fig. 2 is a partially exploded perspective view of the syringe shown in fig. 1.

Fig. 3 is a perspective view of the medicament container in the injector shown in fig. 1 and 2.

Fig. 4 is an assembled view of the injection module of the injector shown in fig. 1 and 2.

Fig. 5 is an exploded perspective view of a switching mechanism in the injection module shown in fig. 1, 2 and 4.

Fig. 6 is a schematic exploded perspective view of another viewing angle of the switching mechanism in the injection module shown in fig. 1, 2 and 4.

Fig. 7 is a partial side plan view of the syringe of fig. 1 and 2.

Fig. 8 isbase:Sub>A schematic sectional view taken along linebase:Sub>A-base:Sub>A in fig. 7.

Fig. 9 is a schematic sectional view taken along line B-B in fig. 7.

Fig. 10 is an exploded perspective view of the needle discharging mechanism in the injection module shown in fig. 1, 2 and 4.

Fig. 11 is an exploded perspective view of the needle ejecting mechanism of the injection module shown in fig. 1, 2 and 4 from another viewing angle.

Fig. 12 is a schematic plan view of the needle withdrawing mechanism in the injection module shown in fig. 1, 2 and 4.

Fig. 13 is a schematic sectional view taken along line C-C in fig. 12.

Fig. 14 is a schematic sectional view taken along line D-D in fig. 12.

Fig. 15 is an exploded perspective view of the drive mechanism in the injector shown in fig. 1 and 2.

Fig. 16 is another exploded perspective view of the drive mechanism in the injector of fig. 1 and 2.

Fig. 17 is a schematic view illustrating the operation of the injector of fig. 1-2 for assembling medicament containers into an injection module.

Fig. 18 is an operational view of the drive mechanism for reassembling the combination of the medicament container and the injection module of the present invention shown in fig. 1 to 2 when the injector is in use.

Fig. 19 is a cross-sectional view of the needle ejection mechanism of the injection module of fig. 1-2 with the safety shield and safety pin removed in use of the injector of the present invention.

Fig. 20 is an operation diagram of the needle discharging mechanism shown in fig. 19, in which the needle discharging operation assembly is pressed to drive the needle set in the connection component to extend out of the base to discharge the needle in a manner that the soft needle penetrates the hard needle.

Fig. 21 is an operation diagram of the needle discharging mechanism shown in fig. 20, when the needle discharging operation piece is fixed in the base, the needle seat is separated from the needle discharging operation piece and pops out, and the hard needle is driven to be separated from the soft needle.

FIG. 22 is a schematic view showing the needle withdrawing mechanism of FIG. 20 after the needle withdrawing mechanism has been operated to retract the soft needle by the needle retracting device.

FIG. 23 is a schematic view (I) showing the needle withdrawing mechanism shown in FIG. 21, cutting the reduced diameter portion of the connecting part head of the connecting member.

FIG. 24 is a second view showing the operation of the needle withdrawing mechanism shown in FIG. 21 for cutting off the reduced diameter portion of the connecting portion head of the connecting member.

The reference numbers indicate:

10: medicament container

11: container body

12: container joint

121: female joint

122: clamping groove

13: back film

2: injection module

20: switching mechanism

21: conversion connecting seat

211: seat body

212: valve seat part

213: input adapter

2131: male joint

2132: clamping hook

214: output adapter

215: connecting plate

216: clamping part

217: hook part

218: back film

22: driving piston group

221: piston cylinder

2211: valve member connecting end portion

2212: sliding chute

2213: clamping block

222: valve member

2221: input one-way valve

2222: output one-way valve

223: piston rod

2231: sliding block

2232: l-shaped clamping groove

30: needle outlet mechanism

31: base seat

311: movable room

312: seat board

3121: joining part

313: piercing of holes

314: through-hole

315: movable opening

316: fixing buckle hook

32: connecting part

321: connecting base

3211: base peripheral wall

3212: needle assembly part

3213: needle chamber

3214: needle plug hole

3215: cutting edge part

322: connecting head

3221: diameter reducing part

33: needle set

331: soft needle

332: needle plug

333: hard needle

34: needle-out operation assembly

341: needle outlet operation piece

3411: push button part

3412: cutting knife part

342: needle stand

3421: needle stand head end

3422: needle stand connecting rod

3423: joining part

343: sealing member

3431: sealing gasket

3432: cover cap

344: spring

35: narrowing operation member

351: pressing part

352: propping inclined plane

353: extension part

36: safety protecting cover

37: safety pin

38: push spring

40: driving mechanism

41: shell body

411: sleeve joint pipe part

4111: l-shaped clamping groove

412: housing component

413: housing component

414: fixing hook

42: driving member

420: connecting end

421: clamping lug

422: reset spring

43: electric drive unit

431: drive assembly

432: transmission assembly

4321: transmission rod

4322: gear set

4323: eccentric cam

44: control unit

441: control circuit board

442: display panel

443: control key

444: contact switch

45: electricity storage unit

46: electrical connection element

Detailed Description

The technical means adopted by the invention to achieve the preset purpose are further described below by combining the accompanying drawings and the preferred embodiments of the invention.

As described above, the present invention includes a drive piston group of a syringe and a conversion mechanism of a syringe, and the conversion mechanism includes the drive piston group. Referring to fig. 1 and 2, there is shown a preferred embodiment of the conversion mechanism comprising the driving piston assembly applied to an injector, which defines an X-axis, a Y-axis and a Z-axis perpendicular to each other in three dimensions, and defines a front surface and a back surface on opposite sides of the X-axis, respectively, the injector being constructed to include a medicine container 10, an injection module 2 and a driving mechanism 40. In the preferred embodiment shown in fig. 2, the drive piston assembly 22 and the conversion mechanism 20 of the present invention are part of the injection module 2. The following description will be made of specific configurations of the drive piston group 22 and the conversion mechanism 20, and related components of the injector having a coupling relationship with the drive piston group 22 and the conversion mechanism 20 of the present invention, respectively.

As shown in fig. 1 to 3, the medicine container 10 is used for accommodating and sealing a predetermined dose of medicine liquid, the medicine container 10 includes a container body 11 and a container joint 12, the container body 11 has a space capable of accommodating the medicine liquid in a sealing manner, the container joint 12 is located on one side of the container body 11 in the Z-axis direction and is communicated with the inside of the container body 11, and the medicine liquid filled in the container body 11 can be output through the container joint 12. In the preferred embodiment, the back adhesive sheet 13 with release paper can be disposed on the back of the container body 11 of the medicament container 10, so that the medicament container 10 can be adhered to a human body or an article by the back adhesive sheet 13 after being torn off from the release paper; alternatively, the back film is replaced with a strap, and the medicine container is fixed to a human body or an article by the strap. The medicament container 10 can be assembled with the injection module 2 by means of the container connector 12.

As shown in fig. 1, 2 and 4, the injection module 2 includes the conversion mechanism 20 and the needle discharging mechanism 30, and the conversion mechanism 20 and the needle discharging mechanism 30 can be assembled in advance to form a modular structure when shipped from a factory, so that a user can quickly assemble the injection module 2 with the medicament container 10 and the driving mechanism 40 for use. This injection module 2's back can set up the backing film that has from type paper, makes it can tear from type paper after to the backing film pastes on human body or article, perhaps, this injection module 2's back sets up the band, replaces the backing film with the band, and borrows to be fixed in on human body or article by the band.

As shown in fig. 4 to fig. 6, the conversion mechanism 20 connects the medicament container 10 and the driving mechanism 40, the conversion mechanism 20 includes a conversion connection seat 21 and the driving piston set 22, the conversion connection seat 21 includes an input adapter 213 and an output adapter 214, the input adapter 213 connects the medicament container 10, and the output adapter 214 connects the needle discharging mechanism 30. In this preferred embodiment, the conversion connecting base 21 further includes a base 211 and a valve seat 212, the valve seat 212 is disposed on the base 211, the valve seat 212 has a fitting opening with an outward opening, the driving piston assembly 22 can be assembled to the fitting opening, the input adapter 213 is disposed on one side of the valve seat 212 opposite to the fitting opening, the output adapter 214 is disposed in the base 211, the input adapter 213 and the output adapter 214 are respectively communicated with the fitting opening of the valve seat 212, the input adapter 213 can be detachably connected to the container connector 12 of the medicine container 10, and the output adapter 214 can be connected to the needle mechanism 30.

As shown in fig. 4 to 6, in the preferred embodiment, the socket of the valve seat portion 212 faces outward in the Y-axis direction, the input adapter 213 faces in the Y-axis direction, and the output adapter 214 faces in the Z-axis direction. The driving piston assembly 22 is installed at the engaging opening of the valve seat 212, and the driving piston assembly 22 can be controlled to move so as to draw the liquid medicine in the medicine container 10 into the driving piston assembly 22 through the input adapter 213, and then transfer the liquid medicine in the input driving piston assembly 22 to the output adapter 214 for output. The seat 211 may further have a connecting plate 215, and the connecting plate 215 is connected and combined with the needle discharging mechanism 30, wherein the connecting plate 215 forms a clamping portion 216 on two opposite sides of the Y-axis direction, and the connecting plate 215 has a hook portion 217, so that the connecting plate 215 can be clamped and combined with the needle discharging mechanism 30.

As shown in fig. 4 to 6, in the preferred embodiment, the input adapter 213 of the conversion mechanism 20 includes a male connector 2131 and at least one hook 2132, the container connector 12 of the medicine container 10 includes a female connector 121 and at least one slot 122, and by the matching combination of the male connector 2131 of the input adapter 213 and the female connector 121 of the container connector 12 and the matching combination of the hook 2132 of the input adapter 213 and the slot 122 of the container connector 12. The male connector 2131 and the female connector 121 may be standardized male luer connector (luer taper) and female luer connector (luer taper), respectively, which have a function of preventing a small amount of leakage after being combined.

As shown in fig. 4 to fig. 6, in the preferred embodiment, the back surface of the connecting plate 215 of the seat body 211 of the convertible connecting seat 21 is provided with a back adhesive sheet 218 having a release paper, so that the back adhesive sheet 218 can be adhered to a human body or an article after the release paper is torn off, or the back surface of the seat body 211 of the convertible connecting seat 21 is provided with a strap, which replaces the back adhesive sheet and is fixed to the human body or the article by the strap.

As shown in fig. 2, 4 to 6 and 7 to 9, in the preferred embodiment, the driving piston assembly 22 includes a piston cylinder 221, a valve element 222 and a piston rod 223 capable of moving linearly in the piston cylinder 221 along the Y-axis direction, one end of the piston cylinder 221 has a valve element connecting end 2211, the piston cylinder 221 has a piston chamber therein, the piston chamber extends to the other end of the piston cylinder 221 along the Y-axis direction and is formed with an opening, the piston cylinder 221 is combined with the valve element 222 by the valve element connecting end 2211 and is disposed in the valve seat portion 212, the valve element 222 has an input one-way valve 2221 and an output one-way valve 2222 therein, the input one-way valve 2221 is correspondingly connected with the input adapter 213, and the input one-way valve 2221 can be opened only by the input adapter 213 towards the valve seat portion 212, the output one-way valve 2222 is correspondingly connected with the output adapter 214, and the output one-way valve 2222 can be opened only by the input adapter 212 towards the output adapter 214, the input adapter 213 and the output one-way valve 2221 and the output one-way valve 2222 of the adapter 21 can be opened only by the valve 221 respectively connected with the piston rod 223 so that the piston rod assembly can be connected with the piston rod 223 by the piston rod 223 and can be driven linearly and the piston rod mechanism 223 to drive the piston rod mechanism can be connected with the piston rod 223 along the piston cylinder 223.

As shown in fig. 4 to fig. 6, in the preferred embodiment, at least one sliding slot 2212 extending along the Y-axis direction is disposed in the inner wall of the piston cylinder 221, at least one sliding block 2231 is disposed on the outer peripheral surface of the piston rod 223, and each sliding block 2231 is disposed in the corresponding sliding slot 2212 for guiding the piston rod 223 to move linearly along the Y-axis direction in the piston cylinder 221. In addition, the piston rod 223 is a hollow rod having at least one L-shaped engaging groove 2232, so that the piston rod 223 and the driving mechanism 40 can be connected in a rotatable engaging manner, and the piston rod 223 can be driven by the driving mechanism 40.

As shown in fig. 2, 4 and 10-14, the needle-out mechanism 30 is connected to the switching mechanism 20 for injecting the liquid medicine, and the needle-out mechanism 30 includes a base 31, a connecting member 32, a needle set 33, a needle-out operation assembly 34 and a needle retracting operation member 35.

As shown in fig. 10 to 14, the base 31 can be assembled with the seat 211 of the conversion mechanism 20, and the base 31 has a movable chamber 311 with an opening facing the front side of the X-axis direction, the movable chamber 311 has a seat plate 312 facing the back side of the X-axis direction, the seat plate 312 has a through hole 313 communicating with the movable chamber 311, the base 31 has a through hole 314 communicating with the movable chamber 311 on one side of the movable chamber 311 in the Y-axis direction, and the base 31 has a movable opening 315 communicating with the movable chamber 311 on one side facing the conversion mechanism 20. The seat plate 312 is provided with a combining portion 3121 at two sides of the Y-axis direction, the combining portion 3121 is correspondingly combined with the clamping portion 216 of the connecting plate 215 of the converting connecting seat 21 of the converting mechanism 20, the hook portion 217 of the connecting plate 215 can be clamped and fixed with the seat plate 312, and the base 31 can be further provided with a fixed buckle 316 at the periphery of the movable chamber 311.

As shown in fig. 10 to fig. 14, the connecting member 32 is movably installed in the movable chamber 311 of the base 31 along the X-axis direction, and the connecting member 32 includes a connecting base 321 and a connector 322, the connecting base 321 has a base wall 3211 and a needle assembling portion 3212 installed in the base wall 3211, the needle assembling portion 3212 has a needle chamber 3213 therein, and an end of the needle assembling portion 3212 facing the base plate 312 of the base 31 is provided with a needle plug hole 3214 communicating with the needle chamber 3213, the needle plug hole 3214 corresponds to the through hole 313 of the base plate 312, that is, the position of the needle plug hole 3214 corresponds to the position of the through hole 313, the connector 322 is installed on the connecting base 321 and communicates with the needle chamber 3213 in the needle assembling portion 3212, and the connector 322 extends toward the Z-axis direction, in the preferred embodiment, an end of the connector 322 connecting the connecting base 321 forms a reducing diameter 3221 capable of being reduced and cutting off the adapter, and the connector 322 of the connecting member 32 passes through the switching mechanism 321315 of the base 31 and connects the output port 214 of the movable mechanism 214. The base portion peripheral wall 3211 includes at least one cutting edge 3215 on a side away from the seat plate 312 of the base 31.

As shown in fig. 10 to 14, the needle set 33 is movably installed in the needle set installation portion of the connecting member 32 along the X-axis direction and is operable to perform needle withdrawing and retracting actions, the needle set 33 includes a soft needle 331, a needle plug 332 and a hard needle 333, the soft needle 331 is movably installed in the needle chamber 3213 of the needle set installation portion 3212 along the X-axis direction, one end of the soft needle 331 faces the needle plug hole 3214, the other end of the soft needle 331 is fixedly connected to the needle plug 332, the needle plug 332 is in a needle withdrawing state in which the soft needle 331 is driven to protrude out of the seat plate 312 of the base 31, the needle plug 332 is fixed to the needle plug hole 3214, the hard needle 333 is driven to penetrate through the needle plug 332 and the soft needle and to withdraw together with the soft needle 331, and after the soft needle 331 is withdrawn, the hard needle 333 is driven to be separated from the soft needle plug 331, the soft needle connector 331 is communicated with the switching mechanism 20 via the needle chamber 3213 and the needle 322, thereby providing a path for the medicine liquid to flow; in the needle retracting state, the soft needle 331 is driven to retract into the base 31 together with the connecting member 32.

As shown in fig. 10 to 14, the needle discharging operation assembly 34 is installed in the base 31 and can drive the needle set 33 to perform a needle discharging operation, and the needle discharging operation assembly 34 includes a needle discharging operation member 341, a needle holder 342, a sealing member 343 and a spring 344.

As shown in fig. 10 to 14, the needle discharging operation element 341 is movably mounted in the base 31 along the X-axis direction, and the needle discharging operation element 341 is fastened and fixed by the fixing hook 316 of the base 31, the needle discharging operation element 341 includes a button 3411 and an accommodating space located at one side of the button 3411, the accommodating space corresponds to the movable chamber 311 of the base 31, that is, the position of the accommodating space corresponds to the position of the movable chamber 311. The needle extracting operation element 341 has a cutting blade 3412 on the side corresponding to the connecting head 322, and the cutting blade 3412 can be operated to cut the reduced diameter portion 3221 of the connecting head 322 of the connecting member 32.

As shown in fig. 10 to fig. 14, the needle base 342 is disposed in the movable chamber 311 of the needle withdrawing operation member 341 and connected to the needle withdrawing operation member 341, after the needle base 342 is in the needle withdrawing state, the needle base 342 can be separated from the needle withdrawing operation member 341, the needle base 342 includes a needle base head end 3421 and a needle base connecting rod 3422, the needle base head end 3421 is connected to the needle withdrawing operation member 341, the needle base connecting rod 3422 is formed at the needle base head end 3421, and the needle base connecting rod 3422 is connected to the hard needle 333 and can push against the needle plug 332 of the needle set 33.

As shown in fig. 10 to 14, in the preferred embodiment, the needle base 342 and the needle discharging operation member 341 are integrally formed, and a connection portion 3423 capable of being cut off is provided between the peripheral edge of the head end 3421 of the needle base and the inner wall of the accommodating space of the needle discharging operation member 341. The engagement portion 3423 is cut by the cutting edge portion 3215 of the connecting member 32 mounted on the base 31, and the needle holder 342 is disengaged from the needle withdrawing operation member 341.

As shown in fig. 10 to 14, the sealing member 343 is mounted in the connecting component 32 in combination with the spring 344, the sealing member 343 is disposed outside the needle assembling portion 3212 and covers the needle chamber 3213, the sealing member 343 is tightly sleeved outside the needle hub connecting rod 3422, the spring 344 is sleeved outside the needle hub connecting rod 3422, two ends of the spring 344 are respectively connected to the needle hub head end 3421 of the needle hub 342 and the sealing member 343, in the preferred embodiment, the sealing member 343 includes a sealing pad 3431 and a covering cap 3432 sleeved outside the sealing pad 3431, a portion of the covering cap 3432 abutting against the spring 344 is provided, and the sealing pad 3431 is tightly sleeved outside the needle hub connecting rod 3422.

As shown in fig. 10 to 14, when the needle discharging operation member 341 is pressed toward the base 31, the hard needle 333 of the needle set 33 is inserted into the soft needle 331, so the needle discharging operation member 341 drives the needle holder 342 to push the needle set out of the seat plate 312 of the base 31, and simultaneously presses the connection member 32 via the spring 344, so that the connection member 32 abuts against the seat plate 312 on the back side of the base 31, i.e., the soft needle 331 can pierce the human body in the combined form of combining with the hard needle 333 until the needle stopper 332 is fixed in the needle stopper hole 3214 of the needle assembling portion 3212, the needle discharging operation member 341 is fastened and fixed by the fixing buckle 316 in the base 31, the engagement portion 3423 on the periphery of the needle holder 342 is cut by the cutting edge portion 3215 of the connection member 32, the needle holder is automatically pushed to move outward by the elastic force of the spring 344, and the hard needle 333 is pulled out from the soft needle 331 via the needle holder link 3422 of the needle holder 342, so that the soft needle 331 communicates with the needle chamber 3213 and the connection member 322 to communicate with the soft needle 20.

As shown in fig. 10 to 14, the narrowing operator 35 extends from the outer side of the base 31 into the movable chamber 311 through a through hole. The needle retracting operation member 35 includes a pressing portion 351, a top abutting inclined surface 352 and an extending portion 353, the pressing portion 351 is located outside the base 31, the top abutting inclined surface 352 is located on one side of the pressing portion 351 extending into the movable chamber 311, the top abutting inclined surface 352 abuts against the base peripheral wall 3211 of the connecting member 32, the extending portion 353 is located on one side of the pressing portion 351 extending into the movable chamber 311 and bypasses the needle assembling portion 3212 of the connecting member 32, the end of the extending portion 353 is provided with a limit hook, and the base 31 limits the limit hook to enable the needle retracting operation member 35 to be installed in the base 31, and can move in a limited distance and cannot be separated from the base 31. When the pressing portion 351 of the needle retracting operation member 35 is pressed, the abutting inclined surface 352 pushes the connecting member 32 of the base 31 away from the seat plate 312 of the base 31, which is located on the back side, thereby retracting the connecting member 32 and the soft needle 331 of the needle set 33 inserted into the connecting member 32 into the base 31.

As shown in fig. 10, 11 and 14, the needle-out mechanism 30 may further comprise a safety cover 36 and a safety pin 37 to ensure the safety of the needle-out mechanism 30. The safety protecting cover 36 covers the outer side of the needle discharging operation assembly 34 and can be fixed on the base 31 in a clamping manner, the safety pin 37 penetrates through the safety protecting cover 36 and the needle discharging operation member 341 of the needle discharging operation assembly 34 to be fixed, so that the needle discharging mechanism 30 can execute the needle discharging action after the safety pin 37 is pulled out and the safety protecting cover 36 is taken down, and the use safety is ensured. In addition, a pushing spring 38 may be disposed between the safety cover 36 and the needle-out operation member 341, so that after the safety pin 37 is removed, the safety cover 36 is automatically ejected from the base 31 by the pushing spring 38, thereby improving the convenience of operation.

As shown in fig. 1, 2 and 15 to 16, the driving mechanism 40 is assembled with the conversion mechanism 20 of the injection module and can drive the piston rod 223 in the conversion mechanism 20 to move, and the driving mechanism 40 can be a manual driving mechanism or an electric driving mechanism. Preferably, the driving mechanism 40 is detachably connected to the switching mechanism 20 of the injection module, so that the driving mechanism 40 can be reused. The driving mechanism 40 includes a housing 41 and a driving member 42 installed in the housing 41, the housing 41 is detachably connected to the converting connecting seat 21 of the converting mechanism 20, the driving member 42 is detachably connected to the piston rod 223, and the driving member 42 can drive the piston rod 223 to move manually or electrically.

In the preferred embodiment shown in fig. 15 to 16, the housing 41 is a hollow body having a space therein, the side of the housing 41 has a sleeve pipe portion 411, the sleeve pipe portion 411 has a shaft hole extending from the outside to the inside of the housing 41, and the sleeve pipe portion 411 is detachably sleeved on the outside of the piston cylinder 221 of the switching mechanism 20.

As shown in fig. 15 to 16, in the preferred embodiment, the housing 41 is formed by assembling a plurality of housing parts 412, 413 by screwing, clipping or bonding. This cup joint pipe portion 411 and piston cylinder 221 are connected with the joint mode of can rotating, and wherein, the outer peripheral face of piston cylinder 221 is equipped with fixture block 2213, cup joints pipe portion 411 and is equipped with L shape draw-in groove 4111, borrows the combination of fixture block 2213 and L shape draw-in groove 4111, and this cup joint pipe portion 411 and piston cylinder 221 can rotate the joint mode and connect.

As shown in fig. 15 to 16 in conjunction with fig. 8 and 9, the driving member 42 is installed in the socket pipe 411 of the housing 41 in a linear motion manner, and an end of the driving member 42 facing the outside of the socket pipe 411 is a connecting end 420, and the connecting end 420 is detachably connected to the piston rod 223. In the preferred embodiment, the outer peripheral surface of the connecting end 420 of the driving member 42 has at least one engaging protrusion 421, and the driving member 42 can be installed in the piston rod 223, and the engaging protrusion 421 is correspondingly matched with the L-shaped engaging groove 2232 of the piston rod 223, so that the piston rod 223 and the driving mechanism 40 can be rotatably engaged with each other.

As shown in fig. 15 to 16, in the preferred embodiment, the driving mechanism 40 is an electric driving mechanism, but not limited thereto. When the driving mechanism 40 is an electric driving mechanism, the driving mechanism 40 includes an electric driving unit 43 and a control unit 44, or further includes an electric power storage unit 45, in addition to the housing 41 and the driving member 42 installed in the housing 41.

As shown in fig. 15 to 16, the electric driving unit 43 is installed in the housing 41 and can be connected to the driving member 42 disposed in the sleeve pipe 411 of the housing 41, the electric driving unit 43 includes a driving component 431 and a transmission component 432, the driving component 431 can be an electric driving mechanism including a motor and a pump or other electric rotating driving mechanism, and the transmission component 432 is connected to the driving component 431 and the driving member 42, so that the driving component 431 can drive the driving member 42 through the transmission component 432. In the preferred embodiment, the transmission assembly 432 includes a transmission rod 4321 and a gear set 4322, the transmission rod 4321 is pivoted in the housing 41, the transmission rod 4321 has at least one eccentric cam 4323, the gear set 4322 includes a plurality of gears engaged with each other, the gear set 4322 is connected between the driving assembly 431 and the transmission rod 4321, the eccentric cam 4323 of the transmission rod 4321 is connected to the other end of the driving member 42 in the housing 41, and a return spring 422 is disposed between the driving member 42 and the housing 41 for combining with the eccentric cam 4323 of the transmission rod 4321 to drive the driving member 42 and the piston rod 223 connected thereto to reciprocate linearly. In the preferred embodiment, the return spring 422 is a compression spring, the return spring 422 is sleeved outside the driving element 42, the other end of the driving element 42 located in the housing 41 has an abutting flange, and two ends of the return spring 422 abut against the abutting flanges of the housing 41 and the driving element 42, respectively.

As shown in fig. 15 to 16, the control unit 44 is disposed in the housing 41, and the control unit 44 includes a control circuit board 441 and a display panel 442, the display panel 442 is electrically connected to the control circuit board 441, and the display panel 442 is exposed on the front surface of the housing 41, the display panel 442 may be a display panel generally having a display function, the control unit 44 further has at least one control key 443, the control key 443 is disposed on the front surface of the housing 41 and located at a side of the display panel 442, and the control key 443 is electrically connected to the control circuit board 441, so as to provide a user with opening, closing, setting and operating through the control key 443. Alternatively, the display panel 442 may also be a touch display panel, which is capable of displaying the working state and has user operation definitions for the user to perform setting and operation on the display panel.

As shown in fig. 15 to 16, the control unit 44 further includes at least one contact switch 444, the contact switch 444 is disposed on the housing 41 adjacent to one side of the needle discharging mechanism 30 and electrically connected to the control circuit board 441, and when the driving mechanism 40 is connected to the switching mechanism 20 of the injection module 2, the needle discharging mechanism 30 of the injection module 2 can contact the contact switch 444 to switch the control unit 44 from the off state to the on state. The driving mechanism 40 may further include a fixing hook 414 disposed at a position of the housing 41 adjacent to the contact switch 444, and the base 31 of the needle discharging mechanism 30 is fixed on the housing 41 by the fixing hook 414, so that the driving mechanism 40 is firmly combined with the injection module 2.

As shown in fig. 15 to 16, the control unit 44 can be connected to an external power source or the power storage unit 45, and the external power source or the power storage unit 45 provides the electric power required for the operation of the driving mechanism 40. In the preferred embodiment shown in fig. 15 to 16, the driving mechanism 40 further includes an electric storage unit 45, and the electric storage unit 45 is disposed in the housing 41 and electrically connected to the control circuit board 441 of the control unit 44. The power storage unit 45 can be a wireless rechargeable power storage unit, a wired rechargeable power storage unit or other non-rechargeable power storage units (such as a battery). In the preferred embodiment shown in fig. 15 to 16, the power storage unit 45 is a rechargeable power storage unit, such as: the electric storage unit 45 is electrically connected to an electrical connection element 46, and the electrical connection element 46 is exposed outside the housing 41 and can be connected to an external power source through a connection line, so as to charge the electric storage unit 45. The electrical connection element 46 may be a Universal Serial Bus (USB) type electrical connection element or other types of electrical connection elements.

Referring to fig. 17 and 18, the conversion mechanism 20 and the needle discharging mechanism 30 are previously assembled into an injection module 2 at the time of shipping, before a user intends to perform hypodermic injection, a medicine container 10 containing an injection liquid and a driving mechanism 40 are sequentially assembled with the conversion mechanism 20 of the injection module 2, wherein the medicine container 10 is assembled with the input adapter 213 of the conversion mechanism 20 of the injection module 2 by abutting the container adapter 12 to the input adapter 213, and the driving mechanism 40 is connected with the conversion mechanism 20, wherein the engaging tube 411 of the driving mechanism 40 is rotatably engaged with the piston cylinder 221 of the conversion mechanism 20, and the driving member is connected with the piston rod 223, and after the injection module 2 is rotated to a predetermined position, the needle discharging mechanism 30 contacts the contact switch 444 of the driving mechanism 40, so that the control unit 44 of the driving mechanism 40 is switched from a closed state to an activated state.

As shown in fig. 18 to 21, before injection, the medicine container 10 and the injection module 2 are fixed on the predetermined injection site of the human body by means of the adhesive tape 13 or the band fastening, the safety pin 37 and the safety cover 36 of the needle discharging mechanism 30 of the injection module 2 are removed, then the needle discharging operation member 341 of the needle discharging mechanism 30 is pressed to fix the needle discharging operation member 341 on the base 31, the needle set 33 is pushed through the needle seat 342, the needle set 33 extends out of the base 31 by means of the hard needle 333 inserted in the soft needle 331 and directly penetrates into the human body, the engagement part 3423 between the needle seat 342 and the needle discharging operation member 341 is cut off by the cutting edge 3215 of the connecting member 32, the needle seat 342 is pushed by the elastic force of the spring, the hard needle 333 is driven by the needle seat to be withdrawn from the soft needle 331, the soft needle 331 remains in the human body, the soft needle 331 is communicated with the output conversion mechanism 214 of the needle chamber 3213 and the connecting head 322, and then the user can operate the driving mechanism 40 to drive the piston 22 of the medicine container 20 to withdraw the medicine liquid from the medicine container 10 and transfer mechanism 342 into the human body through the needle discharging conversion mechanism 342. After the injection is completed, the driving mechanism 40 is stopped to drive the driving piston group 22 of the conversion mechanism 20. Thus, by fixing the syringe to the human body and maintaining the soft needle 331 inserted into the human body, the user can inject a plurality of injections at regular times through the driving mechanism 40.

When the medical solution in the medical container 10 is used up, as shown in fig. 22, the user can press the retracting operation device 35 of the needle mechanism 30, and the abutting inclined plane 352 of the retracting operation device 35 pushes the connecting part 32 in the base 31 away from the seat plate 312 on the back of the base 31, and at the same time, the soft needle 331 of the needle set 33 in the connecting part 32 is pulled out of the human body and retracted into the base 31, as shown in fig. 23 and fig. 24, at this time, in the pushing process of the connecting part 32 for the abutting inclined plane 352 of the retracting operation device 35, the reduced diameter portion 3221 of the connecting part 32 connected with the connecting head 322 of the converting mechanism 20 is cut off by the cutter portion 3412 of the needle-out operation device 341 fixed on the base 31, so that the injection module 2 cannot be reused repeatedly, and the use safety of the syringe is ensured, and the driving mechanism 40 can be detached from the injection module 2 after the syringe is used, and is left for next reuse.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (11)

1. A drive piston group of a syringe, which is used in the syringe, is characterized in that the drive piston group can be connected with a drive mechanism; wherein the content of the first and second substances,

the driving piston group comprises a piston cylinder, a valve element and a piston rod;

the piston cylinder is provided with a piston chamber, and one end of the piston cylinder is provided with a valve piece connecting end part;

the valve element is arranged in the valve element connecting end part of the piston cylinder, the valve element is provided with an input one-way valve and an output one-way valve, the input one-way valve can only be opened towards the direction of the piston cylinder in a one-way manner, and the output one-way valve can only be opened towards the outside by the piston cylinder in a one-way manner;

the piston rod can be arranged in the piston cylinder in a linear motion way, and the piston rod can be connected with the driving mechanism in a detachable way.

2. The piston assembly as claimed in claim 1, wherein the piston assembly is capable of being mounted in a conversion mechanism of the syringe, and a medicament container containing medicament liquid and a needle discharging mechanism having a needle set are connected through the conversion mechanism, so that the piston rod in the piston cylinder is driven by the driving mechanism to pump the medicament liquid in the medicament container to the needle discharging mechanism, and the needle set of the needle discharging mechanism performs medicament liquid injection.

3. The set of driving pistons for syringes according to claim 1, wherein the inner wall of the piston cylinder has at least one sliding slot therein, the outer circumferential surface of the piston rod has at least one sliding block, each sliding block is disposed in a corresponding sliding slot for guiding the piston rod to move linearly in the piston cylinder.

4. The set of driving pistons for syringes according to any of claims 1 to 3, wherein the piston rod is a hollow rod with at least one L-shaped engaging groove, and the piston rod can be connected to the driving mechanism in a rotational engaging manner, so that the piston rod can be driven by the driving mechanism.

5. A conversion mechanism of an injector is used in the injector and is characterized in that the conversion mechanism can be connected with a driving mechanism with a driving piece, wherein the conversion mechanism comprises a conversion connecting seat and a driving piston group arranged in the conversion connecting seat;

the conversion connecting seat comprises an input adapter and an output adapter;

the drive piston assembly comprises a piston cylinder, a valve element and a piston rod, wherein the piston cylinder is provided with a piston chamber, one end of the piston cylinder is provided with a valve element connecting end part, a ram valve is mounted in the valve element connecting end part, the valve element is provided with an input one-way valve correspondingly connected with the input adapter and an output one-way valve correspondingly connected with the output adapter, the input one-way valve can be opened in one direction towards the piston cylinder only by the input adapter, and the output one-way valve can be opened in one direction only by the piston cylinder towards the output adapter; the piston rod can be arranged in the piston cylinder in a linear motion way, and the piston rod can be connected with the driving part of the driving mechanism in a detachable way.

6. The syringe conversion mechanism of claim 5, wherein the conversion mechanism is capable of forming an injection module in combination with a needle discharging mechanism having a needle set, the input adapter of the conversion mechanism is capable of connecting to a medicament container containing medicament, the output adapter is capable of connecting to the needle discharging mechanism, the driving mechanism is capable of driving the piston rod in the piston cylinder to pump the medicament in the medicament container to the needle discharging mechanism, and the needle set of the needle discharging mechanism is used for performing medicament injection.

7. The syringe conversion mechanism of claim 6, wherein the inner wall of the barrel has at least one slot, the outer surface of the plunger rod has at least one slide block, and each slide block is disposed in the corresponding slot to guide the plunger rod to move linearly in the barrel.

8. The syringe conversion mechanism of claim 6, wherein the plunger rod is a hollow rod having at least one L-shaped engagement slot, and the plunger rod is rotatably engaged with the driving mechanism such that the plunger rod is driven by the driving mechanism.

9. The syringe switching mechanism according to any one of claims 6 to 8, wherein the switching connector base further comprises a base body and a valve seat portion disposed on the base body, the valve seat portion having a fitting opening, the input adapter being disposed on a side of the valve seat portion opposite to the fitting opening, the output adapter being disposed in the base body, the input adapter and the output adapter being respectively communicated with the fitting opening.

10. The syringe conversion mechanism of claim 9, wherein the housing has a connecting plate, the connecting plate has a clamping portion formed on opposite sides thereof, and the connecting plate has a hook portion for engaging with the needle ejecting mechanism.

11. The syringe conversion mechanism of claim 9, wherein the driving mechanism comprises a housing, the driving member is disposed in the housing, the housing has a socket tube portion on a side thereof, the socket tube portion is detachably fitted over the outer side of the piston cylinder, and the driving member is linearly movably disposed in the socket tube portion.

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