WO2020006751A1

WO2020006751A1 - Syringe

Info

Publication number: WO2020006751A1
Application number: PCT/CN2018/094831
Authority: WO
Inventors: 叶进民
Original assignee: 群康生技股份有限公司
Priority date: 2018-07-06
Filing date: 2018-07-06
Publication date: 2020-01-09

Abstract

A syringe (1), which is used for providing a barrel assembly (40) assembled therein to constitute an injection device. The syringe (1) comprises a housing shell (10), a needle cover (20) and an elastic protecting member (30), the needle cover (20) is detachably connected to a front end of the housing shell (10), and the elastic protecting member (30) is mounted inside the housing shell (10) and extends into the needle cover (20). When the barrel assembly (40) is mounted in the syringe (1), a soft stopper (44) sleeved on a needle (43) at a front end of a barrel (41) extends into the needle cover (20), so that the needle cover (20), a sheath body (31) at a front end of the elastic protecting member (30), and the soft stopper (44) together provide safety protection against the needle (43). Before injecting, the needle cover (20) is detached from the front end of the housing shell (10) and the soft stopper (44) is pulled out along therewith by means of an elastic hook portion (23) at a rear end of the needle cover (20), so that the soft stopper (44) sleeved on the needle (43) can be easily removed, the sheath body (31) can be located outside the needle (43) to protect, and the sheath body (31) is able to extend or contract along with the injection action.

Description

syringe

Technical field

The present invention relates to a syringe, and more particularly to a syringe for forming an injection device in combination with a syringe assembly and providing a safe injection purpose.

Background technique

In the process of injecting medicines into the patients by medical personnel, in order to reduce the risk of infection due to accidental needle sticks, the syringe assembly must be assisted by a syringe to provide the purpose of safe injection. The presently known structure of a syringe includes an outer casing and a protective sleeve. The protective sleeve group is disposed in the outer casing, and the protective sleeve is capable of retracting and retracting at the front end of the outer casing.

When the syringe and the syringe assembly constitute an injection device, the outer shell of the syringe is sleeved on the outside of the syringe of the syringe assembly, and a needle cover is sleeved on the outside of the puncture needle located at the front end of the syringe, and the puncture needle together with the needle on the outside thereof The cover extends into the protective sleeve at the front end of the outer shell, and the front end of the needle cover extends out of the protective cover. Before the injection device is injected, the puncture needle at the front end of the syringe assembly provides double safety protection through the needle cover and the protective sleeve to prevent the puncture needle from being inserted and ensure the safety of the injection device.

After the aforementioned known syringe and syringe assembly are combined, although the puncture needle provided on the syringe assembly and the outer side of the needle cap can be protected by a protective cap, the safety protection function can be provided. In addition, in order to facilitate the removal of the needle cover of the syringe assembly and the protective cover, it is necessary to provide a safety protection function for the lancet and the needle cover. Generally speaking, the needle cover protrudes from the front end of the protective sleeve, so that medical personnel can directly remove the needle cover. However, the protective cap of the known syringe must consider the length of the puncture needle, so the protective cover occupies almost two-thirds of the needle cap. As a result, the length of the needle cap protruding from the outer side of the front end of the protective cap is short, which is not conducive to the removal of the needle cap by the medical staff, so that the risk of the medical staff accidentally touching the protective cap is high.

In addition, the protective sleeve of the existing syringe only provides the telescopic function. After the medical staff completes the human injection operation, the protective sleeve can cover the outside of the lancet by using elastic force. However, the protective cover of the syringe does not have an automatic locking mechanism. Stretchability, so that medical personnel may accidentally touch the protective cover and risk needle sticking.

Summary of the invention

The technical problem to be solved by the present invention is to provide a syringe, which solves the problem that after a conventional syringe is combined with a syringe assembly, a needle cap located at the front end of the syringe assembly is difficult to remove from the protective cover of the syringe.

The technical solution provided by the present invention is to provide a syringe for assembling a syringe assembly to constitute an injection device. The syringe assembly is provided with a soft stopper on the outer side of a puncture needle at the front end thereof, and the syringe defines There is a central axis extending axially forward and backward, where the syringe includes:

An outer casing includes a casing, a syringe coupling portion, and a fixing portion. The casing forms a channel penetrating along the central axis direction, and the outer peripheral surface of the casing is opposite to the central axis at two sides, respectively. An outwardly protruding operation portion is formed. The front end of the housing has a connecting section. The syringe coupling portion and the fixing portion are formed at the rear end of the housing. The syringe coupling portion is used to connect the syringe. Component

A needle cover that can be detachably connected to a connecting section at the front end of the outer shell. The needle cover includes an outer cover body, an inner cover body, and a spring hook portion. The inner cover body is formed in the outer cover body. There is a gap between the outer peripheral surface of the inner cover body and the inner peripheral surface of the outer cover body. The rear end of the inner cover body forms a rear port of the inner cover, which is used to provide a soft plug of the syringe assembly. Extending into it, the spring hook portion is formed at the rear end of the inner cover body and extends outside the rear end of the outer cover body. The spring hook portion is used to connect the soft plug of the syringe assembly, so that the needle cover can Remove the front end of the outer case together with the soft plug; and

An elastic protection member is arranged in the outer shell and connected to the needle cover. The elastic protection member includes a sheath body, a syringe connection portion and an elastic body. The syringe connection portion is located in the sheath body. To the rear, the syringe connecting portion includes a connecting base, and the elastic body is located between the sheath body and the connecting base of the syringe connecting portion, and the syringe connecting portion is fixed in the outer casing and connected to the syringe. The sheath body passes through the connecting section at the front end of the outer casing and extends into the needle cover. When the needle cover is detached from the front end of the outer casing, the sheath body is provided with elasticity through the elastic body. The sheath body can be telescopically moved along the central axis direction at the front end of the outer casing.

In the syringe as described above, two limiting flanges are formed in the inner side wall of the front section of the casing of the outer casing, and the two limiting flanges are respectively located on opposite sides of the central axis; the sheath body includes A set of bodies penetrating the central axis, the rear end of the set of bodies forms two limit stop pieces, the two limit stop pieces respectively correspond to the two limit flanges, and the two limit stop pieces can follow the limit The sheath body moves in the outer casing, and the limit stop can be moved to a position forward of the corresponding limit flange when the sheath body is ejected.

In the above-mentioned syringe, the connecting base of the elastic protective member includes two fixed plate bodies spaced back and forth along the central axis, and each of the fixed plate bodies has a half-ring body with a gap, and the two fixed plates The notch of the body is on the same side as the central axis; the elastic body includes an elastic base, a front connecting portion, and a rear connecting portion. The elastic base includes at least one elastic unit, and the front connecting portion and the rear connecting portion are respectively formed. At the front end and the rear end of the elastic base, the front connection part is connected to the rear end of the sheath body, and the rear connection part is connected to the front end of the syringe connection part; the elastic unit is formed into a V-shaped curved body, And it has elasticity of compression and recovery back and forth along the central axis, and the curved shape of the curved body of the elastic unit corresponds to the curved shape of the half-ring body of the fixed plate body.

In the syringe as described above, the elastic base of the elastic body of the elastic protection member has a plurality of the elastic units, and the plurality of the elastic units are sequentially connected from the back.

In the above-mentioned syringe, the connecting section at the front end of the housing has two snap-in holes, and the two snap-in holes are radially oppositely arranged with respect to the central axis, and the syringe coupling portion includes a plurality of syringe hooks. A plurality of the syringe hooks are formed on the peripheral edge of the rear end of the casing and have elasticity of bending deformation. The plurality of syringe hooks are used to connect the syringe assembly; the fixing portion includes two bending deformation elastic fixings. A convex piece, two fixed convex pieces protruding rearward from the rear peripheral edge of the housing and arranged radially opposite to each other, the fixed convex piece is provided with a fixed card slot; the syringe connection part of the elastic protection member includes two connections A plate body, the two connection plate bodies are respectively disposed on two sides of the connection base opposite to the central axis, and the rear ends of the two connection plate bodies each have a latching projecting rearwardly from the rear end of the connection base. An elastic piece, the clip-made elastic piece has a snap flange, the clip-shaped elastic piece has elasticity of bending deformation and recovery, and the clip flange of each of the clip elastic pieces can be fixed with each of the rear ends of the outer shell. The fixed card slot of the convex piece corresponds to the card combination, so that the pin The connection portion is fixed to the rear end of the outer shell.

In the above-mentioned syringe, the side wall of the connecting section of the outer shell forms an elongated guide hole, the elongated guide hole extends parallel to the central axis direction and communicates radially from the outer surface of the housing to the Channel, the inner wall of the casing forms a guide rail, which extends from the inner wall of the front section of the casing to the inner wall of the rear end; the sheath body includes a set of bodies penetrating along the central axis. The side wall has a spring buckle that extends into the elongated guide hole. The rear end of the sleeve body forms a connecting piece protruding rearwardly. The connecting piece is connected to the elastic body and the connecting piece. A guide groove is formed on the outer side of the casing, and the guide groove is sleeved on a guide rail on the inner side wall of the casing of the outer casing; a side of the syringe connection portion of the elastic protection member forms a guide groove, and the guide groove It is sleeved on the guide rail of the inner wall of the casing of the outer casing.

In the syringe as described above, a viewing window is formed in a side wall of the middle section of the casing of the outer casing, and the viewing window is communicated radially from the outer surface of the casing to the channel.

In the syringe as described above, the housing forms two pairs of positioning grooves in the side wall of the channel. The two positioning grooves are located on opposite sides of the channel and communicate with each other. The connecting section at the front end of the housing has two cards. A connecting hole, and the two engaging holes respectively communicate with the two alignment grooves respectively; the elastic hook portion of the needle cover includes a plurality of hooks, and the plurality of hooks are distributed on the peripheral edge of the rear end of the inner cover and are convex toward the rear The rear end of the inner cover body forms a rearwardly protruding abutting tab, and the abutting tab and a plurality of the claws are formed on the inner cover body at an equal angular distribution with respect to the central axis. The rear edge of the rear cover; the rear end of the outer cover body protrudes rearwardly from two clip spring pieces, and the two clip spring pieces are respectively disposed on two sides of the outer cover body opposite to the central axis; The elastic hook portion extends into the channel of the outer casing, and the two latching spring pieces of the needle cover respectively extend into the two positioning grooves of the outer casing and are engaged with the engaging holes at the front end of the casing. The needle cover group is arranged at a connecting section at the front end of the outer casing, and the needle cover can be detached from the connecting section at the front end of the outer casing.

In the syringe as described above, the front end of the outer cover body has a front end plate, and the inner cover body extends rearwardly from the back surface of the front end plate. The inner cover body has a set of space provided along the set of space. The center axis extends forward into the front plate; the rear end of the outer cover of the needle cover protrudes rearwardly from a plurality of alignment inserts, and the front end surface of the connection section of the shell of the outer shell forms a plurality of alignment recesses. A plurality of the positioning recesses respectively provide a plurality of corresponding positioning inserts.

The beneficial effects achieved by the present invention are:

1. When the syringe is combined with a syringe assembly to form an injection device, the syringe assembly is installed in the syringe from the back of the syringe from the back to the front, and the soft plug of the syringe assembly is set on the outside of the puncture needle. Into the needle cap, before the injection, the needle cap, the elastic protective member and the soft plug are jointly provided with safety protection to the puncture needle to ensure its safety in use.

2. The needle cap of the syringe is extended behind the soft plug set on the outside of the lancet by its spring hook portion. Before the medical staff wants to inject the human body, the needle cap located at the front of the outer casing is taken out, and the The structure of the elastic hook hooks the soft plug sleeved on the outer side of the lancet, so that the needle cover can be pulled out from the front end of the outer shell together with the soft plug, so that the syringe assembly installed in the syringe is originally set on the outer side of the lancet. The soft plug can be easily pulled out, and can avoid accidentally touching the sheath body of the elastic protective member. The sheath body of the elastic protective member of the syringe maintains the cover on the outside of the puncture needle of the syringe assembly to prevent the puncture needle from being exposed. Therefore, it can effectively solve the problems that after the existing syringe is combined with the syringe assembly, the needle cap located at the front end of the syringe assembly is difficult to remove from the protective cap of the syringe, and the risk that the medical staff accidentally touches the protective cap is high.

In addition, the syringe of the present invention can further use the inner wall of the casing of the outer shell to form a limiting flange, and the rear end of the sheath body of the elastic protection member has a structure of a limiting stopper. When the injection device is pulled, when the lancet at the front end of the syringe assembly is withdrawn from the body of the person being injected, the sheath body of the elastic protective member provides elastic force through the elastic body, and pushes against the sheath body to pop out from the front end of the outer shell, so that the lancet is covered. In the sheath body, and the limit stop at the rear end of the sheath body moves forward as the sheath body is ejected, the limit stop can be moved by the limit flange on the inner side wall of the shell of the outer shell To the front of the limiting flange, through the blocking limit of the limiting flange behind the limiting baffle, a locking function is provided to prevent the sheath body from moving backward, so that the sheath body is maintained in a state of being sheathed outside the lancet. Ensure that the lancet is not exposed for use.

In addition, the syringe of the present invention can further utilize the connecting base of the elastic protective member to include two fixed plate bodies spaced back and forth along the central axis, each of the fixed plate bodies has a half-ring body with a gap, and two The notch of the fixing plate body is on the side facing the central axis; the elastic body includes an elastic base portion and a front connecting portion and a rear connecting portion which are respectively arranged before and after the elastic base portion, and the front connecting portion is connected to the rear end of the connecting piece body of the sheath body, The rear connecting part is connected to the front end of the syringe connecting part. The elastic base includes at least one elastic unit, which forms a V-shaped curved body and has compression and recovery elasticity. The curved shape of the curved body of the elastic unit. Corresponding to the curved shape of the half-ring body of the fixed plate body. Thereby, the shape and structure of the elastic protector can be simplified, and it can be easily molded and manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS

The following drawings are only intended to schematically illustrate and explain the present invention, and do not limit the scope of the present invention. among them:

FIG. 1 is a schematic perspective view of an embodiment of a syringe according to the present invention.

FIG. 2 is a schematic perspective view of the syringe embodiment shown in FIG. 1 at another viewing angle.

FIG. 3 is an exploded perspective view of the syringe embodiment shown in FIG. 1 and FIG. 2.

FIG. 4 is a schematic exploded perspective view (1) of the embodiment of the syringe shown in FIGS. 1 and 2 at another viewing angle.

FIG. 5 is a schematic exploded perspective view (2) of the embodiment of the syringe shown in FIGS. 1 and 2 at another viewing angle.

FIG. 6 is a schematic side perspective view of the outer casing of the syringe embodiment shown in FIG. 1 and FIG. 4.

FIG. 7 is a schematic sectional side view of the syringe embodiment shown in FIGS. 1 to 5 after being assembled.

8 is a schematic side plan view of the embodiment of the syringe shown in FIGS. 1 to 5 before being combined with a syringe assembly.

FIG. 9 is a schematic perspective view of the injection device comprising the syringe embodiment and the syringe assembly shown in FIGS. 1 to 5.

FIG. 10 is a schematic side sectional view of the injection device composed of the syringe embodiment and the syringe assembly shown in FIGS. 1 to 5.

11 is a schematic diagram of an initial state of an injection device consisting of the syringe embodiment and the syringe assembly shown in FIGS. 1 to 5 before use.

FIG. 12 is a reference view of the injection device composed of the embodiment of the syringe shown in FIG. 1 to FIG. 5 combined with the syringe assembly after removing the needle cap and the soft plug of the syringe assembly.

13 is a schematic side sectional view of the injection device composed of the embodiment of the syringe shown in FIGS. 1 to 5 combined with a syringe assembly after the needle cap and the soft plug of the syringe assembly are removed.

FIG. 14 is a reference view (1) of a human body injection using the injection device composed of the syringe embodiment and the syringe assembly shown in FIGS. 1 to 5.

FIG. 15 is a reference diagram (2) of a human body injection using the injection device composed of the syringe embodiment and the syringe assembly shown in FIGS. 1 to 5.

FIG. 16 is a reference view (3) of a human body injection using the injection device composed of the syringe embodiment and the syringe assembly shown in FIGS. 1 to 5.

FIG. 17 is a reference view of the use state of the sheath body after the injection device composed of the syringe embodiment and the syringe assembly shown in FIGS. 1 to 5 is removed from the human body after the injection.

FIG. 18 is a reference view of the ejected sheath body being locked after the injection device consisting of the syringe embodiment and the syringe assembly shown in FIGS. 1 to 5 is removed from the human body after the injection.

BRIEF DESCRIPTION OF THE DRAWINGS

1 syringe

1A central axis

10 outer shell

11 shells 110 channels 110 channels

111 connection section 112 card connection hole

113 Alignment recessed section 12 Syringe joint section

121 Syringe card hook 13 fixing section

131 fixed convex plate 132 fixed card slot

14 Operating Department 15 Viewing Window

16 long guide holes 17 guide rails

18-limiting flange 19-aligning groove

20-pin cover

21 Outer cover 210 storage space

22 Inner lid body 220 set up space

23.Bouncing Hooks 231 hooks

24 front plate 25 abutting tabs

26-card clips 27-position inserts

30 elastic protection

31 套身部 311 套体 31 sheath body

312 bullet buckle 313 connecting piece body

314 guide slot 315 limit stop

32-syringe connection section 320 connection plate

321 connection base 322 fixed plate

323 notch 324 guide slot

325 card shrapnel 326 card flange

33 elastomers 331 elastic base

3310 elastic unit 332 front connection

333 rear connection

40 syringe assembly

41 needle cylinder 42 piston push rod

43 barbed needle 44 soft stopper

detailed description

In the following, with reference to the accompanying drawings and preferred embodiments of the present invention, the technical means adopted by the present invention to achieve the intended purpose of the present invention will be further explained.

The syringe of the present invention is used for assembling a syringe assembly with a medicinal solution to constitute an injection device. As shown in FIG. 1 to FIG. 5, it discloses an embodiment of a syringe of the present invention. The syringe 1 includes a casing 10, a needle cap 20, and an elastic protection member 30. The syringe 1 defines a central axis 1A. The central axis 1A extends axially forward and backward.

As shown in FIG. 3 to FIG. 6, the outer casing 10 includes a casing 11, a syringe coupling portion 12, and a fixing portion 13. A passage 110 is formed in the casing 11 and penetrates along the central axis 1A. Two sides of the outer peripheral surface of the casing 11 opposite to the central axis 1A are respectively formed with an outwardly protruding operation portion 14. The two operation portions 14 provide a part for a medical staff to abut against, and the front portion of the casing 11 is a The connecting section 111 is used to connect the needle cover 20, the syringe coupling portion 12 and the fixing portion 13 are formed at the rear end of the housing 11, and the syringe coupling portion 12 is used to connect the In the syringe assembly, the fixing portion 13 is used for assembling the elastic protection member 30.

As shown in FIG. 3 to FIG. 6, in the outer casing 10, the connecting section 111 at the front end of the housing 11 has two snap-in holes 112, and the two snap-in holes 112 are arranged radially opposite to the central axis 1A. The syringe coupling portion 12 includes a plurality of syringe hooks 121. The plurality of syringe hooks 121 are formed on the peripheral edge of the rear end of the casing 11 and have elasticity for bending deformation. The fixing portion 13 includes two fixing protrusions 131. The two fixing protrusions 131 project from the peripheral edge of the rear end of the housing 11 toward the rear and are arranged radially opposite to each other. The two fixing protrusions 131 have elasticity of bending deformation. Each of the fixing protrusions 131 is provided with a fixing slot 132 for engaging the elastic protection member 30.

As shown in FIG. 3 to FIG. 6, in the aforementioned outer casing 10, the casing 11 forms a viewing window 15 in a side wall of the middle section, and the viewing window 15 is communicated radially from the outer surface of the casing 11 to The channel 110. An elongated guide hole 16 is formed on the side wall of the connecting section 111 at the front end of the casing 11 opposite to the viewing window 15. The elongated guide hole 16 extends parallel to the center axis 1A and extends from the shell. The outer surface of the body 11 communicates radially to the channel 110. A guide rail 17 can also be formed on the inner wall of the casing 11 on the side opposite to the viewing window 15. The guide rail 17 extends from the inner wall of the front section of the housing 11 to the inner wall of the rear end. At least one limiting flange 18 is formed in an inner side wall of the front section of the casing 11 for limiting the movement stroke of the elastic protection member 30.

As shown in FIG. 3 to FIG. 6, the casing 11 forms two alignment grooves 19 in a side wall of the channel 110, and the two alignment grooves 19 are located on opposite sides of the channel 110 and communicate with each other. The two connecting holes 112 of the connecting section 111 at the front end of the housing 11 respectively communicate with the channel 110.

As shown in FIGS. 3 to 7, the needle cover 20 is a connecting section 111 detachably connected to the front end of the outer casing 10. The needle cover 20 includes an outer cover body 21, an inner cover body 22, and a spring hook portion 23. The outer cover body 21 has an accommodation space 210 that extends to the rear end of the outer cover body 21. A rear port is formed. The inner cover 22 is formed in the accommodating space 210 of the outer cover 21. A gap is formed between an outer peripheral surface of the inner cover 22 and an inner peripheral surface of the outer cover 21. There is a set of setting space 220, which forms a rear port of the inner cover at the rear end of the inner cover 22, and the elastic hook portion 23 is formed at the rear end of the inner cover 22 and protrudes from the outer cover The rear end of the body 21 is outside.

As shown in FIG. 3 to FIG. 7, in this embodiment, the front end of the outer cover 21 has a front plate 24, the inner cover 22 extends rearwardly from the back of the front plate 24, and the group is provided with a space 220. Extending forward along the central axis 1A to the front end plate 24.

As shown in FIG. 3 to FIG. 7, the elastic hook portion 23 includes a plurality of hook claws 231. The plurality of hook claws 231 are disposed on a peripheral edge of the rear end of the inner cover 22 and protrude rearward. In the present embodiment, the rear end of the inner cover 22 also forms an abutting tab 25 protruding rearward, and the abutting tab 25 and the plurality of hooks 231 are distributed at an equal angle with respect to the center axis 1A. The rear end of the inner cover 22 is formed in a line at the peripheral edge of the rear end. The rear end of the outer cover 21 also protrudes two latching spring pieces 26 toward the rear. The two latching spring pieces 26 are respectively disposed on two sides of the outer cover 21 opposite to the central axis 1A.

As shown in FIG. 3 to FIG. 5 and FIG. 7, the needle cover 20 is detachably installed at the front end of the outer casing 10, wherein the abutting tab 25 of the needle cover 20 and the elastic hook portion 23 extend. Into the channel 110 of the outer casing 10, the two latching springs 26 of the needle cover 20 respectively extend into the two positioning grooves 19 of the outer casing 10 and are engaged with the engaging holes 112 at the front end of the casing 11 The needle cover 20 is assembled at the connecting section 111 at the front end of the outer casing 10, and the needle cover 20 can be detached from the connecting section 111 at the front end of the outer casing 10.

As shown in FIG. 3 to FIG. 5 and FIG. 7, in the needle cover 20, the rear end of the outer cover body 21 may further project a plurality of alignment inserts 27 rearward, and a plurality of the alignment inserts 27 are distributed on Two side edges of the latching spring piece 26, a front end surface of the connecting section 111 of the housing 11 of the outer shell 10 forms a plurality of alignment recesses 113, and a plurality of the alignment recesses 113 respectively provide a plurality of the alignment inserts 27. Corresponding insertion is used to assist the coupling between the needle cover 20 and the outer shell 10.

As shown in FIG. 3 to FIG. 5 and FIG. 7, the elastic protection member 30 is assembled in the outer casing 10 and connected to the needle cover 20. The elastic protection member 30 includes a sheath body 31 and a syringe connection portion. 32 and an elastic body 33. The syringe connecting portion 32 is located behind the sheath body 31. The elastic body 33 is located between the sheath body 31 and the syringe connecting portion 32 and connects the sheath body 31 and The syringe connecting portion 32 is fixed to the outer casing 10 with the syringe connecting portion 32. The sheath body 31 passes through the connecting section 111 at the front end of the outer casing 10 and extends into the needle cover 20. In a state where the front end of the shell 10 is detached, the elasticity provided by the elastic body 33 to the sheath body 31 enables the sheath body 31 to be located at the front end of the outer shell 10 along the center axis 1A direction (front-rear axis). Telescopic activity.

As shown in FIG. 3 to FIG. 7, in this embodiment, the sheath body 31 includes a sheath body 311 penetrating along the central axis 1A (front-rear axial direction). A side wall of the sheath body 311 has a The elastic buckle 312 extends into the elongated guide hole 16 of the outer shell 10, so that the linear guide stroke of the sheath body 31 is restricted by the elongated guide hole 16. An engaging piece body 313 protruding rearward is formed at the end, and the engaging piece body 313 is connected to the elastic body 33. An outer side of the engaging piece body 313 forms a guide groove 314, and the guide groove 314 of the sleeve body 311 is sleeved on The guide rail 17 on the inner wall of the casing 11 of the outer casing 10 can move linearly forward and backward along the guide rail 17.

The rear end of the sleeve body 311 can also form at least one limit stop piece 315. The limit stop piece 315 has the elasticity of bending deformation and reset. The limit stop piece 315 can be matched with the shell of the outer shell 10. The limiting flange 18 in the inner side wall of 11 generates a locking function. In this embodiment, the rear end of the sleeve body 311 forms two limiting stops 315, and the two limiting stops 315 are respectively located in the The opposite sides of the front and rear axial directions (that is, the central axis) of the sleeve body 311. In the initial state before use, the limit stop 315 is located radially inward of the limit flange 18, and the limit stop 315 can move when the sheath body 31 is ejected forward by the elastic force provided by the elastic body 33. To the front side of the limiting flange 18 to generate a locking function to prevent the sheath body 31 from moving backward. The engaging piece body 313 is located on a side between the two limiting piece 315, and the elastic buckle 312 is connected to the engaging piece. The sheet body 313 is located on the same side of the sleeve body 311.

As shown in FIG. 3 to FIG. 5 and FIG. 7, in this embodiment, the syringe connection portion 32 includes a connection base portion 321 and two connection plate bodies 320, and the two connection plate bodies 320 are respectively disposed on the connection base portion 321. Opposite the two sides of the central axis 1A, the rear ends of the two connecting plates 320 each have a clip spring 325 protruding rearward from the rear end of the connection base 321, and the clip spring 325 has a latch. The flange 326 and the clip spring 325 have the elasticity of bending deformation and recovery. The clip flanges 326 of the clip spring 325 can respectively correspond to the fixing clip grooves 132 of the fixing protrusion 131 at the rear end of the outer casing 10. The combination is fixed so that the syringe connection portion 32 is fixed in the rear end of the outer casing 10.

As shown in FIG. 3 to FIG. 7, in this embodiment, the connection base 321 has two fixed plate bodies 322 spaced back and forth along the central axis 1A. Each of the fixed plate bodies 322 has a gap. A half-ring body of 323, the notches 323 of the two fixing plates 322 are on the same side of the central axis 1A. A guide slot 324 is formed on the opposite sides of the two fixing plates 322 opposite to the notch 323. The guide slot 324 of the connection base 321 is sleeved on the guide rail 17 on the inner side wall of the casing 11 of the outer casing 10. Up and can move back and forth along the guide rail 17 linearly.

As shown in FIGS. 3 to 5 and 7, the elastic body 33 includes an elastic base portion 331, a front connecting portion 332, and a rear connecting portion 333. The elastic base portion 331 includes at least one elastic unit 3310. When the elastic base portion 331 has In the case of multiple elastic units 3310, the multiple elastic units 3310 are sequentially connected from the back to the front. The front connecting portion 332 and the rear connecting portion 333 are respectively formed at the front end and the rear end of the elastic base portion 331. The connecting portion 332 is connected to the rear end of the engaging piece body 313 of the sheath body 31, and the rear connecting portion 333 is connected to the front end of the syringe connecting portion 32. In this embodiment, the elastic unit 3310 forms a V-shaped curved body, and has elasticity for compression and recovery along the central axis 1A. The curved shape of the curved body of the elastic unit 3310 Corresponding to the curved shape of the half-ring body of the fixed plate body 322.

As shown in FIGS. 8 to 10, when the syringe 1 of the present invention is combined with a syringe assembly 40 to form an injection device for standby, the syringe assembly 40 includes a syringe 41 filled with a medicinal solution, and a piston pusher is installed in the syringe 41. A rod 42 is provided at the front end of the syringe 41 with a puncture needle 43 and a soft plug 44 sleeved on the outside of the puncture needle 43. The syringe assembly 40 is installed from the rear end of the syringe 1 to the syringe 1 from back to front Inside, the soft plug 44 of the syringe assembly 40 extends into the assembly space 220 of the inner cover 22 of the needle cover 20, the hook portion 23 of the needle cover 20 extends behind the soft plug 44, and the syringe 41 A plurality of the syringe hooks 121 located in the elastic protection member 30 and at the rear end of the outer casing 10 are respectively hooked to the rear end of the syringe 41 and fixed, and the piston pusher 42 extends outside the rear end of the outer casing 10. In this way, during the operation before injection, the lancet 43 is provided with multiple safety protections through the needle cover 20, the elastic protective member 30 and the soft plug 44 to avoid the possibility of the lancet 43 being inserted out.

As shown in FIG. 11 to FIG. 13, before a medical staff wants to use the injection device for human injection, the needle cap 20 at the front end of the outer casing 10 is first pulled out, and the elastic hook portion 23 of the needle cap 20 is hooked and sleeved on the lancet. 43 The soft plug 44 on the outer side causes the needle cap 20 to be pulled out together with the soft plug 44. At this time, the sheath body 31 of the elastic protection member 30 extends beyond the front end of the outer casing 10 and is sleeved on the syringe assembly 40 The outside of the lancet 43 prevents the lancet 43 from being exposed to ensure the safety before use. Moreover, the needle guard 20 is restricted in front of the sheath body 31 of the elastic protective member 30, and in this initial state, the limit stop 315 in the elastic protective member 30 located at the rear end of the sheath body 31 is the limit of the outer shell 10 Since the flange 18 is located radially inward, the sheath body 31 can freely expand and contract at the front end of the outer shell 10.

As shown in FIG. 13 to FIG. 16, when a medical staff performs a human body injection, the sheath body 31 at the front end of the syringe 1 is extended to the planned injection site. In the process, the sheath body 31 still covers the puncture needle 43 Covered inside to ensure safe use. Until the front end of the sheath body 31 contacts the skin of the person to be injected, the piston protector 30 is pressed by the piston pusher 42 on the back side of the syringe assembly 40, so that the elastic protective member 30 is compressed by the compression force to compress the elastic body 33, and the sheath body 31 retracts to In the housing 11 of the outer casing 10, the lancet 43 extends beyond the front end of the sheath body 31 and penetrates into the body of the person to be injected, injects the drug into the person to be injected, and continuously presses the plunger 42 of the syringe assembly 40, The medicinal solution in the syringe 41 is injected into the body of the person to be injected through the puncture needle 43. During the injection process, the medical personnel can observe the advancement amount of the medicine in the syringe 41 through the viewing window 15 of the outer casing 10.

As shown in FIG. 13 and FIG. 17, after the drug solution in the syringe 41 is injected into the body of the injectee, the injection device is pulled back, and at the same time, the lancet 43 at the front end of the syringe assembly 40 is withdrawn from the body of the injectee The sheath body 31 of the elastic protective member 30 provides elastic force through the elastic body 33, and pushes the sheath body 31 to pop out from the front end of the outer casing 10, so that the lancet 43 is covered in the sheath body 31.

As shown in FIG. 18, after the sheath body 31 is ejected from the front end of the outer casing 10 through the elastic body 33, the limit stop 315 at the rear end of the sheath body 31 is moved forward as the sheath body 31 is ejected The limit stop 315 can be moved to the front of the limit flange 18 by the limit flange 18 on the inner side wall of the housing 11 of the outer shell 10, and can be blocked by the limit flange 18 behind the limit stop 315. Limiting the position produces a locking function that prevents the sheath body 31 from moving backward, so that the sheath body 31 is maintained in a state of being sheathed outside the lancet 43 to ensure the safety of use when the lancet 43 is not exposed.

It can be known from the above description that when the syringe of the present invention is combined with a syringe assembly to form an injection device, the syringe assembly can be installed in the syringe from the back to the front, and the soft plug sleeved on the outside of the puncture needle is inserted into the syringe assembly. Inside the needle cap. Before the injection, the needle cap, the elastic protective member and the soft stopper are jointly provided to protect the puncture needle to ensure its safety in use. Secondly, the needle cap of the syringe of the present invention extends behind the soft plug sleeved on the outside of the lancet by its spring hook portion. When the medical staff wants to inject the human body, the needle cap located at the front end of the outer casing is taken out and the needle cap is used. The elastic hook at the rear end is hooked to the structure of the soft plug sleeved on the outside of the lancet, so that the needle cover can be pulled out from the front end of the outer shell together with the soft plug, so that the syringe assembly installed in the syringe is originally set on the lancet. The outer soft plug can be easily pulled out, and can avoid accidentally touching the sheath body of the elastic protector. The sheath body of the elastic protector of the syringe maintains the cover on the outside of the puncture needle of the syringe assembly, and prevents the puncture needle from being exposed. Therefore, it can effectively solve the problems that after the existing syringe is combined with the syringe assembly, the needle cap located at the front end of the syringe assembly is difficult to remove from the protective cap of the syringe, and the risk that the medical staff accidentally touches the protective cap is high.

In addition, the syringe of the present invention can further use the inner wall of the casing of the outer shell to form a limiting flange, and the rear end of the sheath body of the elastic protection member has a structure of a limiting stopper. When the injection device is pulled, when the lancet at the front end of the syringe assembly is withdrawn from the body of the person being injected, the sheath body of the elastic protective member provides elastic force through the elastic body, and pushes against the sheath body to pop out from the front end of the outer shell, so that the lancet is covered. In the body of the sheath, and the limit stop at the rear end of the sheath body moves forward as the sheath body is ejected, the limit stop can pass through the limit flange on the inner side wall of the casing of the outer shell. Move to the front of the limiting flange, and through the blocking limit of the limiting flange behind the limiting baffle, a locking function is prevented to prevent the sheath body from moving backwards, so that the sheath body is maintained in a state of being sheathed outside the lancet. To ensure the safety of the needles from being exposed.

The above description is only the preferred embodiments of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with the preferred embodiments, it is not intended to limit the present invention. Any technology familiar with the profession Personnel, without departing from the scope of the technical solution of the present invention, can use the disclosed technical content to make a few changes or modify the equivalent embodiment of equivalent changes, but as long as it does not depart from the technical solution of the present invention, according to the present invention Any simple modifications, equivalent changes, and modifications made to the above embodiments by the technical essence of the invention still fall within the scope of the technical solution of the present invention.

Claims

A syringe is used for providing a syringe assembly to form an injection device. The syringe assembly is sleeved with a soft stopper on the outside of a puncture needle at the front end of the syringe assembly. The syringe defines a center extending axially forward and backward. Axis, characterized in that the syringe includes:

An outer casing includes a casing, a syringe coupling portion, and a fixing portion. The casing forms a channel penetrating along the central axis direction, and the outer peripheral surface of the casing is opposite to the central axis at two sides, respectively. An outwardly protruding operation portion is formed. The front end of the housing has a connecting section. The syringe coupling portion and the fixing portion are formed at the rear end of the housing. The syringe coupling portion is used to connect the syringe. Component

A needle cover that can be detachably connected to a connecting section at the front end of the outer shell. The needle cover includes an outer cover body, an inner cover body, and a spring hook portion. The inner cover body is formed in the outer cover body. There is a gap between the outer peripheral surface of the inner cover body and the inner peripheral surface of the outer cover body. The rear end of the inner cover body forms a rear port of the inner cover, which is used to provide a soft plug of the syringe assembly. Extending into it, the spring hook portion is formed at the rear end of the inner cover body and extends outside the rear end of the outer cover body. The spring hook portion is used to connect the soft plug of the syringe assembly, so that the needle cover can Remove the front end of the outer case together with the soft plug; and

An elastic protection member is arranged in the outer shell and connected to the needle cover. The elastic protection member includes a sheath body, a syringe connection portion and an elastic body. The syringe connection portion is located in the sheath body. To the rear, the syringe connecting portion includes a connecting base, and the elastic body is located between the sheath body and the connecting base of the syringe connecting portion, and the syringe connecting portion is fixed in the outer casing and connected to the syringe. The sheath body passes through the connecting section at the front end of the outer casing and extends into the needle cover. When the needle cover is detached from the front end of the outer casing, the sheath body is provided with elasticity through the elastic body. The sheath body can be telescopically moved along the central axis direction at the front end of the outer casing.
The syringe according to claim 1, wherein two limiting flanges are formed in the inner side wall of the front section of the casing of the outer casing, and the two limiting flanges are respectively located on opposite sides of the central axis;

The sheath body includes a set of bodies penetrating along the central axis, and the rear end of the cover body forms two limit stop pieces, the two limit stop pieces respectively correspond to the two limit flanges, and the two The limit stop can move with the sheath body in the outer shell. When the cover body is ejected, the limit stop can be moved to the forward position of the corresponding limit flange.
The syringe according to claim 1, wherein the connecting base of the elastic protective member comprises two fixed plate bodies spaced back and forth along the central axis, and each of the fixed plate bodies has a half-ring body with a gap. , The notch of the two fixing plates is on the side facing the central axis;

The elastic body includes an elastic base, a front connecting portion, and a rear connecting portion. The elastic base includes at least one elastic unit. The front connecting portion and the rear connecting portion are respectively formed at a front end and a rear end of the elastic base. The connecting part is connected to the rear end of the sheath body, and the rear connecting part is connected to the front end of the syringe connecting part; the elastic unit is formed into a V-shaped curved body, and has a front-back compression and recovery along the central axis. Elastic, the curved shape of the curved body of the elastic unit corresponds to the curved shape of the half-ring body of the fixed plate body.
The syringe according to claim 2, wherein the connecting base of the elastic protective member comprises two fixed plate bodies spaced back and forth along the central axis, and each of the fixed plate bodies has a half-ring body with a gap. , The notch of the two fixing plates is on the side facing the central axis;

The elastic body includes an elastic base, a front connecting portion, and a rear connecting portion. The elastic base includes at least one elastic unit. The front connecting portion and the rear connecting portion are respectively formed at a front end and a rear end of the elastic base. The connecting part is connected to the rear end of the sheath body, and the rear connecting part is connected to the front end of the syringe connecting part; the elastic unit is formed into a V-shaped curved body, and has a front-back compression and recovery along the central axis. Elastic, the curved shape of the curved body of the elastic unit corresponds to the curved shape of the half-ring body of the fixed plate body.
The syringe according to claim 4, wherein the elastic base of the elastic body of the elastic protection member has a plurality of the elastic units, and the plurality of elastic units are sequentially connected from the back to the back.
The syringe according to any one of claims 1 to 5, wherein the connecting section at the front end of the casing has two snap-in holes, and the two snap-in holes are arranged radially opposite to each other with respect to the central axis, and the The syringe coupling portion includes a plurality of syringe hooks. The plurality of syringe hooks are distributed on the peripheral edge of the rear end of the housing and have elasticity of bending deformation. The plurality of syringe hooks are used to connect the syringes. Component

The fixing portion includes two bending deformation elastic fixing protrusions, the two fixing protrusions project from the peripheral edge of the rear end of the housing toward the rear and are arranged oppositely in the radial direction, and the fixing protrusion is provided with a fixing slot;

The syringe connection portion of the elastic protection member includes two connection plate bodies, the two connection plate bodies are respectively disposed on two sides of the connection base opposite to the central axis, and the rear ends of the two connection plate bodies each have the connection. A clip spring projecting rearward of the base, the clip spring has a snap flange, the clip spring has elasticity of bending deformation and recovery, and the clip flange of each clip spring It can be respectively engaged with the fixing card slot of each of the fixing protrusions at the rear end of the outer casing, so that the syringe connection part is fixed in the rear end of the outer casing.
The syringe according to any one of claims 1 to 5, wherein a side wall of the connecting section of the outer casing is formed with an elongated guide hole, and the elongated guide hole extends parallel to the central axis direction and Radial communication from the outer surface of the casing to the channel, the inner side wall of the casing forms a guide rail, the guide rail extends from the inner side wall of the front section of the casing to the inner side wall of the rear end;

The sheath body includes a set of bodies penetrating along the central axis, a side wall of the sheath body has a snap buckle, the snap buckle extends into the elongated guide hole, and the rear end of the sheath body forms a rearward direction. A protruding tab body is connected to the elastic body, and a guiding groove is formed on the outer side surface of the engaging plate body, and the guiding groove is sleeved on the guide rail of the inner wall of the shell of the outer casing;

A guide slot is formed on the side of the syringe connection portion of the elastic protection member, and the guide slot is sleeved on a guide rail on the inner side wall of the casing of the outer casing.
The syringe according to any one of claims 1 to 5, characterized in that a viewing window is formed in a side wall of the middle section of the casing of the outer casing, and the viewing window communicates radially from the outer surface of the casing To the channel.
The syringe according to any one of claims 1 to 5, wherein the housing forms two pairs of positioning grooves in a side wall of the channel, and the two positioning grooves are located on opposite sides of the channel and communicate with each other. , The connecting section at the front end of the casing has two snap-in holes, and the two snap-in holes respectively correspond to the two alignment slots;

The elastic hook portion of the needle cover includes a plurality of hooks, and the plurality of hooks are distributed on a peripheral edge of the rear end of the inner cover and protrude rearwardly;

The rear end of the inner cover body forms a rearwardly protruding abutment tab, and the abutment tab and a plurality of the claws are formed at the rear end of the inner cover body at an equal angular distribution with respect to the central axis. Peripheral

The rear end of the outer cover body protrudes rearwardly from two clip spring pieces, and the two clip spring pieces are respectively disposed on two sides of the outer cover body opposite to the central axis;

The abutting convex piece of the needle cover and the elastic hook portion protrude into the channel of the outer casing, and the two latching elastic pieces of the needle cover respectively extend into the two positioning grooves of the outer casing and correspond to the casing. The front-end snap-in holes are engaged with each other, so that the needle cover group is arranged at the connecting section of the front end of the outer casing, and the needle cover can be detached from the connecting section of the front end of the outer casing.
The syringe according to claim 9, wherein the front end of the outer cover has a front plate, the inner cover extends rearwardly from the back of the front plate, and the inner cover has a set of space, and The assembling space extends forward along the central axis to the front plate; the rear end of the outer cover of the needle cover protrudes rearwardly from a plurality of positioning inserts, and the front end surface of the connecting section of the shell of the outer shell A plurality of alignment recesses are formed, and a plurality of the alignment recesses respectively provide a plurality of corresponding alignment inserts.