CN110681006A

CN110681006A - Syringe with a needle

Info

Publication number: CN110681006A
Application number: CN201810738167.6A
Authority: CN
Inventors: 叶进民
Original assignee: CC Biotechnology Corp
Current assignee: CC Biotechnology Corp
Priority date: 2018-07-06
Filing date: 2018-07-06
Publication date: 2020-01-14

Abstract

The invention relates to an injector, which is used for providing a needle cylinder component to be assembled therein to form an injection device, the injector comprises an outer casing, a needle cover and an elastic protection component, wherein the needle cover is detachably connected with the front end of the outer casing, the elastic protection component is arranged in the outer casing and extends into the needle cover, when the needle cylinder component is arranged in the injector, a soft plug sleeved outside a puncture needle at the front end of the needle cylinder extends into the needle cover, so that the needle cover, a sheath body at the front end of the elastic protection component and the soft plug jointly provide safety protection for the puncture needle, before injection, the needle cover is detached from the front end of the outer casing, the soft plug is pulled out by an elastic hook part at the rear end of the needle cover, the soft plug sleeved outside the puncture needle is easy to detach, the sheath body can be positioned outside the puncture needle for protection, and the sheath body can stretch along with the injection action.

Description

Syringe with a needle

Technical Field

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

Background

In order to reduce the risk of infection to a medical care provider during the injection of a medication into a patient by the medical care provider, the syringe assembly must be assisted by an injector to provide a safe injection. The present syringe comprises an outer casing and a protective sheath, wherein the protective sheath is assembled in the outer casing, and the protective sheath can be extended and retracted back and forth at the front end of the outer casing.

When the injector and the needle cylinder assembly form the injection device, the outer casing of the injector is sleeved outside the needle cylinder of the needle cylinder assembly, the outer side of the puncture needle positioned at the front end of the needle cylinder is sleeved with a needle cover, the puncture needle and the needle cover at the outer side of the puncture needle extend into the protective sleeve at the front end of the outer casing, and the front end of the needle cover extends out of the protective sleeve. When the injection device is used before injection, the puncture needle at the front end of the needle cylinder assembly provides double safety protection through the needle cover and the protective sleeve, so that the puncture needle is prevented from being inserted out, and the use safety of the injection device is ensured.

After the known injector is combined with the syringe assembly, the protective cover can be used to cover the puncture needle of the syringe assembly and the outer side of the needle cover to provide a safety protection function. Moreover, in order to facilitate the removal of the needle cover of the syringe assembly and the protective cap must provide a safety protection function for the lancet and the needle cover, generally, the needle cover extends out of the front end of the protective sheath to allow the medical staff to directly remove the needle cover. However, the protective cap of known syringes must take into account the length of the lancet, so that the protective sheath occupies almost two thirds of the needle cap. The length of the needle cover extending out of the front end of the protective cover is short, so that medical staff is not facilitated to pull out the needle cover, the risk that the medical staff touch the protective cover by mistake is high, and the use safety of the known injector still has shortcomings.

In addition, the protective sleeve of the existing syringe only provides a telescopic function, and after medical care personnel complete the injection operation of a human body, although the protective sleeve can cover the outer side of the puncture needle by using elastic force, the protective cover of the syringe does not have an automatic locking mechanism and still has the telescopic property, so that the medical care personnel have the risk of mistakenly touching the protective cover and being punctured by the puncture needle.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the utility model provides an injector, which solves the problem that the needle cover positioned at the front end of the syringe component is difficult to take out from the protective cover of the injector after the existing injector is combined with the syringe component.

The technical solution proposed by the invention is as follows: there is provided an injector for assembling a syringe assembly to form an injection device, the syringe assembly being sheathed with a soft plug at an outer side of a puncture needle at a front end thereof, the injector defining a central axis extending axially in front and rear directions, wherein the injector comprises:

the outer casing comprises a casing, a syringe combination part and a fixing part, wherein a channel which is communicated along the direction of the central axis is formed in the casing, an operating part which protrudes outwards is respectively formed on the two sides of the peripheral surface of the casing relative to the central axis, the front end of the casing is provided with a connecting section, the syringe combination part and the fixing part are formed at the rear end of the casing, and the syringe combination part is used for connecting the syringe assembly;

the needle cover is detachably connected with the connecting section at the front end of the outer casing and comprises an outer cover body, an inner cover body and an elastic hook part, the inner cover body is formed in the outer cover body, a space is formed 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 an inner cover rear port which is used for allowing the soft plug of the needle cylinder assembly to extend into the inner cover rear port, the elastic hook part is formed at the rear end of the inner cover body and extends out of the outer cover body, and the elastic hook part is used for connecting the soft plug of the needle cylinder assembly, so that the needle cover and the soft plug can be pulled out from the front end of the outer casing together; and

an elastic protection piece, its group locates in this overcoat shell and connects this needle lid, this elastic protection piece includes a sheath body, a syringe connecting portion and an elastomer, this syringe connecting portion are located the rear of this sheath body, this syringe connecting portion include a connection basal portion, this elastomer is located between the connection basal portion of this sheath body and this syringe connecting portion, this syringe connecting portion are fixed in this overcoat shell and connect this syringe joint portion, this sheath body passes through the linkage segment of this overcoat shell front end and stretches into in this needle lid, under the state that this needle lid is detached from the front end of this overcoat shell, provide elasticity to this sheath body through this elastomer, make this physical stamina of this sheath move about along this central axis direction in the front end of this overcoat shell.

In the above syringe, two limit flanges are formed in the inner side wall of the front section of the housing of the outer casing, and the two limit flanges are respectively located at two opposite sides of the central axis; the sheath body comprises a sleeve body which is communicated along the central axis, the rear end of the sleeve body is provided with two limiting blocking pieces, the two limiting blocking pieces are respectively corresponding to the two limiting flanges, the two limiting blocking pieces can move in the outer sheath along with the sheath body, and under the condition that the sheath body is popped out, the limiting blocking pieces can move to the front positions of the corresponding limiting flanges.

In the syringe as described above, the connecting base of the elastic protection member includes two fixing plates arranged at intervals along the central axis, each of the fixing plates has a half-ring body with a notch, and the notches of the two fixing plates face to one side of the central axis; the elastic body comprises an elastic base part, a front connecting part and a rear connecting part, the elastic base part comprises at least one elastic unit, the front connecting part and the rear connecting part are respectively formed at the front end and the rear end of the elastic base part, the front connecting part is connected with the rear end of the sheath body, and the rear connecting part is connected with the front end of the needle cylinder connecting part; the elastic unit forms a V-shaped arc-shaped body and has elasticity of compressing and restoring along the central axis, and the arc-shaped shape of the arc-shaped body of the elastic unit corresponds to the bending shape of the half-ring body of the fixed plate body.

In the syringe, the elastic base of the elastic body of the elastic protection member has a plurality of elastic units, and the elastic units are connected in sequence from front to back.

In the above-mentioned injector, the connecting section of the front end of the housing has two engaging holes, the two engaging holes are arranged in a radial direction relative to the central axis, the syringe combining portion includes a plurality of syringe hooks, the plurality of syringe hooks are distributed and formed on the rear end periphery of the housing and have elasticity of bending deformation, and the plurality of syringe hooks are used for connecting the syringe assembly; the fixing part comprises two bending and deforming elastic fixing lugs, the two fixing lugs are protruded backwards from the periphery of the rear end of the shell and are arranged oppositely in the radial direction, and the fixing lugs are provided with a fixing clamping groove; the needle cylinder connecting part of the elastic protection piece comprises two connecting plate bodies, the two connecting plate bodies are respectively arranged on two sides, relative to the central axis, of the connecting base part, the rear ends of the two connecting plate bodies are respectively provided with a clamping elastic sheet protruding backwards from the rear end of the connecting base part, each clamping elastic sheet is provided with a clamping flange, each clamping elastic sheet has elasticity of bending deformation and reversion, and the clamping flange of each clamping elastic sheet can be correspondingly clamped and combined with the fixing clamping groove of each fixing lug at the rear end of the outer casing, so that the needle cylinder connecting part is fixed in the rear end of the outer casing.

In the above-mentioned injector, the side wall of the connecting section of the outer casing forms an elongated guiding hole, the elongated guiding hole extends in a direction parallel to the central axis and is communicated with the channel from the outer surface of the casing in the radial direction, the inner side wall of the casing forms a guiding rail, and the guiding rail extends from the inner side wall of the front section of the casing to the inner side wall of the rear end of the casing; the sheath body comprises a sleeve body which is through along the central axis, one side wall of the sleeve body is provided with an elastic buckle, the elastic buckle extends into the long guide hole, the rear end of the sleeve body forms a connecting sheet body which extends towards the rear in a protruding way, the connecting sheet body is connected with the elastic body, the outer side surface of the connecting sheet body forms a guide groove, and the guide groove is sleeved on a guide rail on the inner side wall of the shell of the outer sleeve shell; the side edge of the needle cylinder connecting part of the elastic protection piece forms a guide groove opening which is sleeved on a guide rail on the inner side wall of the shell of the outer sleeve shell.

In the above-mentioned injector, 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 radially communicated with the channel from the outer surface of the casing.

In the above-mentioned injector, the housing forms two alignment grooves in the side wall of the channel, the two alignment grooves are located at two opposite sides of the channel and are communicated with each other, the connecting section at the front end of the housing has two clamping holes, and the two clamping holes are respectively communicated with the two alignment grooves; the elastic hook part of the needle cover comprises a plurality of hooks which are distributed on the periphery of the rear end of the inner cover body and protrude backwards; the rear end of the inner cover body forms an abutting lug which protrudes backwards, and the abutting lug and the plurality of hook claws are formed on the periphery of the rear end of the inner cover body in an equiangular distribution relative to the central axis; the rear end of the outer cover body extends backwards to form two clamping elastic sheets which are respectively arranged on two sides of the outer cover body relative to the central axis; the abutting lug and the elastic hook part of the needle cover extend into the channel of the outer casing, the two clamping elastic sheets of the needle cover correspondingly extend into the two alignment grooves of the outer casing respectively and are clamped and matched with the clamping hole at the front end of the casing, so that the needle cover is arranged at the 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 above syringe, the front end of the outer cap has a front end plate, the inner cap extends backward from the back of the front end plate, and the inner cap has a set of installation spaces therein, the set of installation spaces extending forward along the central axis into the front end plate; the rear end of the outer cover body of the needle cover extends backwards in a protruding mode to form a plurality of alignment insertion pieces, the front end face of the connecting section of the shell of the outer sleeve shell forms a plurality of alignment concave parts, and the alignment concave parts are respectively used for correspondingly inserting the alignment insertion pieces.

The invention has the following beneficial effects:

1. when the injector is combined with the needle cylinder component to form the injection device, the needle cylinder component is arranged in the injector from back to front from the rear end of the injector, the soft plug sleeved outside the puncture needle in the needle cylinder component extends into the needle cover, and before injection, the needle cover, the elastic protection component and the soft plug provide safety protection for the puncture needle together, so that the use safety of the injection device is ensured.

2. The needle cover of the injector extends to the rear part of the soft plug sleeved outside the puncture needle by virtue of the elastic hook part, before medical personnel want to inject a human body, the needle cover positioned at the front end of the outer casing is pulled out, and simultaneously, the structure of the soft plug sleeved outside the puncture needle is hooked by the elastic hook part at the rear end of the needle cover, so that the needle cover can be pulled out from the front end of the outer casing together with the soft plug, the soft plug sleeved outside the puncture needle can be easily pulled out in a needle cylinder assembly arranged in the injector, and the sheath body of the elastic protection piece can be prevented from being touched by mistake, and the sheath body of the elastic protection piece of the injector is maintained to be covered outside the puncture needle of the needle cylinder assembly, and the puncture needle is prevented from being exposed. The problem that after an existing injector is combined with a needle cylinder assembly, a needle cover positioned at the front end of the needle cylinder assembly is difficult to take out of a protective cover of the injector, and the risk that medical workers touch the protective cover by mistake is high can be effectively solved.

In addition, the injector of the invention can further utilize the inner side wall of the shell of the outer casing to form a limit flange, the rear end of the protective sleeve body of the elastic protection piece is provided with a structure of a limit baffle, after the injection operation is finished, the injection device is pulled backwards, when the puncture needle at the front end of the syringe component is pulled away from the body of the injected person, the protective sleeve body of the elastic protection piece provides elasticity through the elastic body to push the protective sleeve body to be popped out from the front end of the outer casing, so that the puncture needle is covered in the protective sleeve body, and in the forward movement process of the limit baffle at the rear end of the protective sleeve body along with the popping of the protective sleeve body, the limit baffle can move to the front of the limit flange through the limit flange at the inner side wall of the shell of the outer casing, and the limit flange is used for blocking and limiting at the rear part of the limit baffle, so as to generate a, ensure the use safety of the puncture needle without exposing.

In addition, the syringe can further utilize the connecting base part of the elastic protection piece to comprise two fixing plate bodies which are arranged at intervals front and back along the central axis, each fixing plate body is provided with a semi-ring body with a notch, and the notches of the two fixing plate bodies face to one side of the central axis; the elastic body comprises an elastic base part, a front connecting part and a rear connecting part, wherein the front connecting part and the rear connecting part are respectively arranged in the front and the rear of the elastic base part, the front connecting part is connected with the rear end of the linking sheet body of the sheath body, the rear connecting part is connected with the front end of the connecting part of the needle cylinder, the elastic base part comprises at least one elastic unit, the elastic unit forms a V-shaped arc curve body and has elasticity of compression and return, and the arc curve shape of the arc curve body of the elastic unit corresponds to the curve shape of the hemicycle body of the. Therefore, the shape structure of the elastic protection piece is simplified, and the elastic protection piece can be easily molded and manufactured.

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 one embodiment of the injector of the present invention.

Fig. 2 is a perspective view of another viewing angle of the embodiment of the injector shown in fig. 1.

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

Fig. 4 is an exploded isometric view (one) from another perspective of the embodiment of the injector shown in fig. 1 and 2.

Fig. 5 is an exploded perspective view (two) of the syringe embodiment of fig. 1 and 2 from another viewing angle.

Fig. 6 is a side sectional perspective view of the outer jacket of the syringe embodiment of fig. 1 and 4.

Fig. 7 is a side sectional perspective view of the assembled embodiment of the injector shown in fig. 1-5.

Fig. 8 is a side plan view of the injector embodiment of fig. 1-5 prior to assembly with a syringe assembly.

Fig. 9 is a schematic perspective external view of the injection device composed of the injector embodiment and the syringe assembly shown in fig. 1 to 5.

Fig. 10 is a side cross-sectional view of the injector device of the embodiment of the injector shown in fig. 1-5 in combination with a syringe assembly.

Fig. 11 is a schematic view of the syringe embodiment and syringe assembly of fig. 1-5 in an initial state prior to use of the injection device.

Fig. 12 is a reference view of the syringe assembly of the embodiment of the syringe shown in fig. 1 to 5 in combination with a syringe assembly after the needle cover and the soft plug of the syringe assembly are removed.

Fig. 13 is a schematic sectional side view of the syringe of fig. 1-5 in combination with a syringe assembly of the present embodiment after the needle cover and the soft plug of the syringe assembly are removed.

Fig. 14 is a reference view (one) showing a state in which the injection device of the embodiment of the syringe shown in fig. 1 to 5 and the syringe assembly are used for injecting a human body.

Fig. 15 is a reference view (ii) showing a state in which the injection device of the syringe embodiment and the syringe assembly shown in fig. 1 to 5 are used for injecting a human body.

Fig. 16 is a reference view (iii) showing a state in which the injection device of the syringe embodiment and the syringe assembly shown in fig. 1 to 5 are used for injecting a human body.

Fig. 17 is a reference view illustrating a use state in which the sheath body is ejected after the injection device composed of the syringe embodiment and the syringe assembly shown in fig. 1 to 5 is pulled out from a human body after injection.

Fig. 18 is a reference view of the embodiment of the syringe shown in fig. 1-5 with the syringe assembly being removed from the body after injection and the ejected sheath body locked.

The reference numbers illustrate:

1 Syringe

1A central axis

10 outer casing

11 housing 110 channel

111 connecting section 112 clamping hole

113 alignment concave part 12 syringe joint part

121 syringe hook 13 fixing part

131 fixed lug 132 fixed slot

14 operating part 15 viewing window

16 elongated guide holes 17 guide rail

18 position-limiting flange 19 alignment groove

20 needle cover

21 outer cover 210 accommodating space

22 inner cover 220 set space

23 elastic hook 231 hook claw

24 front end panel 25 abuts against the tab

26 clamping spring plate 27 aligning insertion piece

30 elastic protector

31 sheath body 311

312 elastic buckle 313 connecting sheet body

314 guide slot 315 limiting baffle

32 syringe connecting part 320 connecting plate

321 connecting base 322 fixing plate

323 gap 324 channel opening

325 clamping spring 326 clamping flange

33 elastomer 331 elastic base

3310 elastic unit 332 front connection part

333 rear connecting part

40 Syringe assembly

41 syringe 42 piston push rod

43 puncture needle 44 soft plug

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.

The injector is used for assembling a syringe assembly with medicament liquid to form an injection device. Referring to fig. 1 to 5, which show an embodiment of the syringe of the present invention, the syringe 1 includes an outer casing 10, a needle cover 20 and an elastic protection member 30, and the syringe 1 defines a central axis 1A, and the central axis 1A extends axially in the front-rear direction.

As shown in fig. 3 to 6, the outer casing 10 includes a housing 11, a syringe engaging portion 12 and a fixing portion 13, a channel 110 is formed in the housing 11 and penetrates along the direction of the central axis 1A, an operating portion 14 protruding outward is formed on the outer peripheral surface of the housing 11 respectively at two sides of the central axis 1A, two operating portions 14 provide portions against which fingers of a medical staff abut, the front section of the housing 11 is a connecting section 111, the connecting section 111 is used for connecting the needle cover 20, the syringe engaging portion 12 and the fixing portion 13 are formed at the rear end of the housing 11, the syringe engaging portion 12 is used for connecting the syringe assembly, and the fixing portion 13 is used for assembling the elastic protection member 30.

As shown in fig. 3 to 6, in the outer casing 10, the connecting section 111 at the front end of the casing 11 has two engaging holes 112, the two engaging holes 112 are arranged in a radial direction relative to the central axis 1A, the syringe combining portion 12 includes a plurality of syringe engaging hooks 121, and the plurality of syringe engaging hooks 121 are distributed and formed on the rear end periphery of the casing 11 and have elasticity for bending deformation. The fixing portion 13 includes two fixing tabs 131, the two fixing tabs 131 are protruded backward from the rear end periphery of the housing 11 and are arranged opposite to each other in the radial direction, the two fixing tabs 131 have elasticity of bending deformation, and a fixing slot 132 is respectively disposed in the fixing tabs 131 for engaging with the elastic protection member 30.

As shown in fig. 3 to 6, in the outer casing 10, the casing 11 has a viewing window 15 formed in a side wall of a middle section thereof, and the viewing window 15 is radially communicated with the channel 110 from the outer surface of the casing 11. The side wall of the connecting section 111 at the front end of the casing 11 opposite to the viewing window 15 forms an elongated guiding hole 16, and the elongated guiding hole 16 extends parallel to the central axis 1A and is radially communicated to the channel 110 from the outer surface of the casing 11. A guide rail 17 may be further formed on an inner sidewall of the side of the housing 11 opposite to the viewing window 15, and the guide rail 17 extends from the inner sidewall of the front section to the inner sidewall of the rear end of the housing 11. At least one limit flange 18 is formed in the inner side wall of the front section of the housing 11 for limiting the movement stroke of the elastic protection member 30.

As shown in fig. 3 to 6, the housing 11 forms two alignment slots 19 in the side wall of the channel 110, and the two alignment slots 19 are located at two opposite sides of the channel 110 and are communicated with each other. The two engaging holes 112 of the connecting section 111 at the front end of the housing 11 are respectively communicated with the channel 110.

As shown in fig. 3 to 7, the needle cover 20 is detachably connected to the connecting section 111 at the front end of the outer casing 10. The needle cover 20 includes an outer cover body 21, an inner cover body 22 and an elastic hook portion 23, the outer cover body 21 has a receiving space 210, and the receiving space 210 extends to a rear end of the outer cover body 21 to form an outer cover rear port. The inner lid 22 is formed in the receiving space 210 of the outer lid 21, a space is formed between the outer peripheral surface of the inner lid 22 and the inner peripheral surface of the outer lid 21, a set of installation spaces 220 is formed in the inner lid 22, the set of installation spaces 220 form an inner lid rear port at the rear end of the inner lid 22, and the elastic hook 23 is formed at the rear end of the inner lid 22 and extends out of the rear end of the outer lid 21.

As shown in fig. 3 to 7, in the present embodiment, the front end of the outer cover 21 has a front end plate 24, the inner cover 22 extends backward from the back of the front end plate 24, and the set of spaces 220 extends forward along the central axis 1A to the front end plate 24.

As shown in fig. 3 to 7, the elastic hook portion 23 includes a plurality of hooks 231, and the plurality of hooks 231 are distributed on the rear end periphery of the inner cover 22 and protrude rearward. In the present embodiment, the rear end of the inner cap 22 further forms a supporting lug 25 protruding rearward, and the supporting lug 25 and the plurality of hooks 231 are formed on the rear end periphery of the inner cap 22 in an equiangular distribution with respect to the central axis 1A. The rear end of the outer cover 21 further protrudes backward to form two snap-in clips 26, and the two snap-in clips 26 are respectively disposed on two sides of the outer cover 21 relative to the central axis 1A.

As shown in fig. 3 to 5 and 7, the needle cover 20 is detachably mounted at the front end of the outer casing 10, wherein the abutting tab 25 and the elastic hook portion 23 of the needle cover 20 extend into the channel 110 of the outer casing 10, the two locking elastic pieces 26 of the needle cover 20 respectively extend into the two alignment slots 19 of the outer casing 10 and are locked with the locking hole 112 at the front end of the casing 11, so that the needle cover 20 is mounted at the connection section 111 at the front end of the outer casing 10, and the needle cover 20 can be detached from the connection section 111 at the front end of the outer casing 10.

As shown in fig. 3 to 5 and 7, in the needle cover 20, the rear end of the outer cover body 21 may further extend backward to form a plurality of alignment insertion pieces 27, the alignment insertion pieces 27 are distributed at the side edges of the two clamping elastic pieces 26, a plurality of alignment recesses 113 are formed on the front end surface of the connecting section 111 of the casing 11 of the outer casing 10, and the alignment recesses 113 respectively provide for the corresponding insertion of the alignment insertion pieces 27 for assisting the combination between the needle cover 20 and the outer casing 10.

As shown in fig. 3 to 5 and 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, a syringe connecting portion 32 and an elastic body 33, the syringe connecting portion 32 is located at the rear of 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, the syringe connecting portion 32 is fixed to the outer casing 10, 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, and in a state where the needle cover 20 is detached from the front end of the outer casing 10, the sheath body 31 can be moved in a telescopic manner along the central axis 1A (front-back axial direction) at the front end of the outer casing 10 by the elasticity provided by the elastic body 33.

As shown in fig. 3 to 7, in the embodiment, the sheath body 31 includes a sheath body 311 penetrating along the central axis 1A (front-back axial direction), a side wall of the sheath body 311 has a snap 312, the snap 312 extends into the elongated guiding hole 16 of the outer casing 10 so as to utilize the elongated guiding hole 16 to limit the stroke of the linear movement of the sheath body 31, a connecting sheet 313 protruding towards the back is formed at the back end of the sheath body 311, the connecting sheet 313 is connected to the elastic body 33, a guide groove 314 is formed on an outer side surface of the connecting sheet 313, the guide groove 314 of the sheath body 311 is sleeved on the guide rail 17 on the inner side wall of the casing 11 of the outer casing 10 and can linearly move along the guide rail 17.

The rear end of the sleeve body 311 may further form at least one limiting block 315, the limiting block 315 has elasticity of bending deformation and resetting, the limiting block 315 can be matched with the limiting flange 18 in the inner side wall of the casing 11 of the outer casing 10 to generate a locking function, in this embodiment, the rear end of the sleeve body 311 forms two limiting blocks 315, and the two limiting blocks 315 are respectively located at two opposite sides of the front and rear axial directions (i.e., the central axis) of the sleeve body 311. In an initial state before use, the limiting blocking piece 315 is located on the radial inner side of the limiting flange 18, when the sheath body 31 is ejected forward by the elastic force provided by the elastic body 33, the limiting blocking piece 315 can move to the front side of the limiting flange 18 to generate a locking function for preventing the sheath body 31 from moving backward, the engaging piece 313 is located on one side between the two limiting blocking pieces 315, and the elastic buckle 312 and the engaging piece 313 are located on the same side of the sheath body 311.

As shown in fig. 3 to 5 and 7, in the present embodiment, the syringe connecting portion 32 includes a connecting base 321 and two connecting plate bodies 320, the two connecting plate bodies 320 are respectively disposed on two sides of the connecting base 321 opposite to the central axis 1A, rear ends of the two connecting plate bodies 320 respectively have a locking elastic sheet 325 protruding rearward from a rear end of the connecting base 321, the locking elastic sheet 325 has a locking flange 326, the locking elastic sheet 325 has elasticity of bending deformation and recovery, the locking flange 326 of the locking elastic sheet 325 can be correspondingly locked and combined with the fixing slot 132 of the fixing lug 131 at the rear end of the outer casing 10, so that the syringe connecting portion 32 is fixed in the rear end of the outer casing 10.

As shown in fig. 3 to 7, in the present embodiment, the connecting base 321 has two fixing plates 322 arranged at intervals along the central axis 1A, each fixing plate 322 is a half-ring with a notch 323, and the notches 323 of the two fixing plates 322 face to one side of the central axis 1A. A guide slot 324 is formed on one side of the two fixing plate bodies 322 opposite to the notch 323, and the guide slot 324 of the connecting base 321 is sleeved on the guide rail 17 on the inner side wall of the casing 11 of the outer casing 10 and can move linearly back and forth along the guide rail 17.

As shown in fig. 3 to 5 and 7, the elastic body 33 includes an elastic base 331, a front connecting portion 332, and a rear connecting portion 333, the elastic base 331 includes at least one elastic unit 3310, when the elastic base 331 has a plurality of elastic units 3310, the elastic units 3310 are sequentially connected from front to back, 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 331, and the front connecting portion 332 is connected to the rear end of the engaging sheet 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 is formed as a V-shaped curved body having elasticity for compressing and restoring back and forth along the central axis 1A, and the curved shape of the curved body of the elastic unit 3310 corresponds to the curved shape of the half-ring body of the fixing plate 322.

As shown in fig. 8 to 10, when the injector 1 of the present invention is combined with the syringe assembly 40 to form an injection device, the syringe assembly 40 includes a syringe 41 containing a liquid medicine, a piston rod 42 is installed in the syringe 41, a puncture needle 43 and a soft plug 44 sleeved outside the puncture needle 43 are installed at the front end of the syringe 41, the syringe assembly 40 is installed in the injector 1 from the rear end of the injector 1 to the front end, wherein the soft plug 44 of the syringe assembly 40 extends into the assembling space 220 of the inner cover 22 of the needle cover 20, the elastic hook portion 23 of the needle cover 20 extends to the rear of the soft plug 44, the syringe 41 is located in the elastic protection member 30, and the plurality of syringe hooks 121 at the rear end of the outer casing 10 are respectively hooked to the rear end of the syringe 41 for fixing, and the piston rod 42 extends out of the rear end of the outer casing 10. In this way, the lancet 43 is provided with multiple safety shields by the needle cover 20, the resilient protector 30 and the soft plug 44 during operation prior to injection, for avoiding the possibility of the lancet 43 being inserted.

As shown in fig. 11 to 13, before the medical staff intends to use the injection device to perform the injection on the human body, the needle cover 20 at the front end of the outer casing 10 is pulled out, wherein the soft plug 44 sleeved outside the puncture needle 43 is hooked by the elastic hook portion 23 of the needle cover 20, so that the needle cover 20 is pulled out together with the soft plug 44, and at this time, the sheath body 31 of the elastic protection member 30 extends out of the front end of the outer casing 10 and is sleeved outside the puncture needle 43 of the syringe assembly 40, thereby preventing the puncture needle 43 from being exposed, and ensuring the safety before the injection. Furthermore, the front of the sheath body 31 of the elastic protection member 30 is limited by the needle-free cover 20, and in this initial state, the limit stop 315 of the elastic protection member 30 at the rear end of the sheath body 31 is located radially inside the limit flange 18 of the outer sheath 10, so that the sheath body 31 can freely stretch and contract at the front end of the outer sheath 10.

As shown in fig. 13 to 16, when a medical worker injects a human body, the sheath body 31 at the front end of the injector 1 extends to a predetermined injection site to be injected, and in the process, the sheath body 31 still covers the puncture needle 43 inside, so that the use safety is ensured. Until the front end of the sheath body 31 contacts the skin of the person to be injected, the elastic protection member 30 is pressed by pressing the piston push rod 42 at the rear side of the syringe assembly 40 to compress the elastic body 33, and further the sheath body 31 retracts into the housing 11 of the outer casing 10, so that the puncture needle 43 protrudes out of the front end of the sheath body 31 and pierces the body of the person to be injected, and the medicine liquid in the syringe 41 is injected into the body of the person to be injected through the puncture needle 43 by continuously pressing the piston push rod 42 of the syringe assembly 40. During the injection, the medical staff can see the amount of the medicine pushed into the syringe 41 through the viewing window 15 of the outer sheath 10.

As shown in fig. 13 and 17, after the medicine liquid in the syringe 41 is injected into the body of the subject, the injection device is pulled back, and the puncture needle 43 at the front end of the syringe assembly 40 is pulled away from the body of the subject, at this time, the sheath body 31 of the elastic protection member 30 provides the elastic force through the elastic body 33, and pushes the sheath body 31 to eject from the front end of the outer sheath 10, so that the puncture needle 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 by the elastic force provided by the elastic body 33, during the forward movement of the limiting block 315 at the rear end of the sheath body 31 along with the ejection of the sheath body 31, the limiting block 315 can move to the front of the limiting flange 18 through the limiting flange 18 on the inner side wall of the housing 11 of the outer casing 10, and the limiting flange 18 blocks the limiting block at the rear of the limiting block 315 to generate a locking function for preventing the sheath body 31 from moving backward, so that the sheath body 31 is maintained in a state of being sleeved on the outer side of the lancet 43, and the use safety of the lancet 43 is ensured without being exposed.

As can be seen from the above description, when the injector of the present invention is combined with a syringe assembly to form an injection device, the syringe assembly can be installed in the injector from back to front, and the soft plug sleeved outside the puncture needle in the syringe assembly extends into the needle cover. Before injection, the needle cover, the elastic protection piece and the soft plug provide safety protection for the puncture needle together, so that the use safety of the puncture needle is ensured. Secondly, the needle cover of the injector extends to the rear of the soft plug sleeved outside the puncture needle by virtue of the elastic hook part, when a medical worker wants to inject a human body, the needle cover positioned at the front end of the outer casing is pulled out, and meanwhile, the structure that the elastic hook part at the rear end of the needle cover is hooked and sleeved on the soft plug at the outer side of the puncture needle is utilized, so that the needle cover and the soft plug can be pulled out from the front end of the outer casing together, the soft plug arranged in the needle cylinder assembly in the injector can be easily pulled out, the sheath body of the elastic protection piece can be prevented from being touched by mistake, and the sheath body of the elastic protection piece of the injector is kept covering the outer side of the puncture needle cylinder assembly, and the puncture needle is prevented from being exposed. The problem that after an existing injector is combined with a needle cylinder assembly, a needle cover positioned at the front end of the needle cylinder assembly is difficult to take out of a protective cover of the injector, and the risk that medical workers touch the protective cover by mistake is high can be effectively solved.

In addition, the injector of the invention can further utilize the inner side wall of the shell of the outer casing to form a limit flange, the rear end of the protective sleeve body of the elastic protection piece is provided with a structure of a limit baffle, after the injection operation is finished, the injection device is pulled backwards, when the puncture needle at the front end of the syringe component is pulled away from the body of the injected person, the protective sleeve body of the elastic protection piece provides elasticity through the elastic body to push the protective sleeve body to be popped out from the front end of the outer casing, so that the puncture needle is covered in the protective sleeve body, and in the forward movement process of the limit baffle at the rear end of the protective sleeve body along with the popping of the protective sleeve body, the limit baffle can move to the front of the limit flange through the limit flange on the inner side wall of the shell of the outer casing, and the limit flange is used for blocking and limiting at the rear part of the limit baffle, so as to generate a locking, ensure the use safety of the puncture needle without exposing.

Although the present invention has been described with reference to a preferred embodiment, 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

1. An injector for providing a syringe assembly for forming an injection device, the syringe assembly having a soft plug sleeved on an outer side of a puncture needle at a front end thereof, the injector defining a central axis extending in a front-rear axial direction, the injector comprising:

2. The syringe of claim 1, wherein the housing of the outer jacket has two retaining flanges formed in the inner sidewall of the front section of the housing, the two retaining flanges being located on opposite sides of the central axis;

the sheath body comprises a sleeve body which is communicated along the central axis, the rear end of the sleeve body is provided with two limiting blocking pieces, the two limiting blocking pieces are respectively corresponding to the two limiting flanges, the two limiting blocking pieces can move in the outer sheath along with the sheath body, and under the condition that the sheath body is popped out, the limiting blocking pieces can move to the front positions of the corresponding limiting flanges.

3. The syringe of claim 1, wherein the connecting base of the elastic protector comprises two fixing plates arranged at intervals back and forth along the central axis, each of the fixing plates having a half-ring body with a notch, the notches of the two fixing plates facing to one side of the central axis;

the elastic body comprises an elastic base part, a front connecting part and a rear connecting part, the elastic base part comprises at least one elastic unit, the front connecting part and the rear connecting part are respectively formed at the front end and the rear end of the elastic base part, the front connecting part is connected with the rear end of the sheath body, and the rear connecting part is connected with the front end of the needle cylinder connecting part; the elastic unit forms a V-shaped arc-shaped body and has elasticity of compressing and restoring along the central axis, and the arc-shaped shape of the arc-shaped body of the elastic unit corresponds to the bending shape of the half-ring body of the fixed plate body.

4. The syringe of claim 2, wherein the connecting base of the elastic protector comprises two fixing plates arranged at intervals back and forth along the central axis, each of the fixing plates has a half-ring body with a notch, and the notches of the two fixing plates face to one side of the central axis;

5. The syringe of claim 4, wherein the elastic base of the elastic body of the elastic protector has a plurality of the elastic units, and the plurality of the elastic units are connected sequentially from front to back.

6. The injector according to any one of claims 1 to 5, wherein the connecting section of the front end of the housing has two engaging holes, the two engaging holes are arranged in a radial direction relative to the central axis, the syringe engaging portion comprises a plurality of syringe hooks, the plurality of syringe hooks are distributed and formed on the rear end periphery of the housing and have elasticity for bending deformation, and the plurality of syringe hooks are used for connecting the syringe assembly;

the fixing part comprises two bending and deforming elastic fixing lugs, the two fixing lugs are protruded backwards from the periphery of the rear end of the shell and are arranged oppositely in the radial direction, and the fixing lugs are provided with a fixing clamping groove;

the needle cylinder connecting part of the elastic protection piece comprises two connecting plate bodies, the two connecting plate bodies are respectively arranged on two sides, relative to the central axis, of the connecting base part, the rear ends of the two connecting plate bodies are respectively provided with a clamping elastic sheet protruding backwards from the rear end of the connecting base part, each clamping elastic sheet is provided with a clamping flange, each clamping elastic sheet has elasticity of bending deformation and reversion, and the clamping flange of each clamping elastic sheet can be correspondingly clamped and combined with the fixing clamping groove of each fixing lug at the rear end of the outer casing, so that the needle cylinder connecting part is fixed in the rear end of the outer casing.

7. The syringe of any one of claims 1 to 5, wherein the side wall of the connecting section of the outer casing defines an elongated guide hole extending parallel to the central axis and communicating radially from the outer surface of the casing to the passage, the inner side wall of the casing defining a guide rail extending from the inner side wall of the front section of the casing to the inner side wall of the rear end;

the sheath body comprises a sleeve body which is through along the central axis, one side wall of the sleeve body is provided with an elastic buckle, the elastic buckle extends into the long guide hole, the rear end of the sleeve body forms a connecting sheet body which extends towards the rear in a protruding way, the connecting sheet body is connected with the elastic body, the outer side surface of the connecting sheet body forms a guide groove, and the guide groove is sleeved on a guide rail on the inner side wall of the shell of the outer sleeve shell;

the side edge of the needle cylinder connecting part of the elastic protection piece forms a guide groove opening which is sleeved on a guide rail on the inner side wall of the shell of the outer sleeve shell.

8. The syringe of any one of claims 1 to 5, wherein a viewing window is formed in a side wall of the intermediate section of the housing of the outer jacket, the viewing window communicating radially from the outer surface of the housing to the passage.

9. The syringe of any one of claims 1 to 5, wherein the housing forms two alignment grooves in the side wall of the channel, the two alignment grooves are located at two opposite sides of the channel and are communicated with each other, the connecting section at the front end of the housing has two engaging holes therein, and the two engaging holes are respectively communicated with the two alignment grooves;

the elastic hook part of the needle cover comprises a plurality of hooks which are distributed on the periphery of the rear end of the inner cover body and protrude backwards;

the rear end of the inner cover body forms an abutting lug which protrudes backwards, and the abutting lug and the plurality of hook claws are formed on the periphery of the rear end of the inner cover body in an equiangular distribution relative to the central axis;

the rear end of the outer cover body extends backwards to form two clamping elastic sheets which are respectively arranged on two sides of the outer cover body relative to the central axis;

the abutting lug and the elastic hook part of the needle cover extend into the channel of the outer casing, the two clamping elastic sheets of the needle cover correspondingly extend into the two alignment grooves of the outer casing respectively and are clamped and matched with the clamping hole at the front end of the casing, so that the needle cover is arranged at the 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.

10. The syringe of claim 9 wherein the front end of the outer cap has a front plate, the inner cap extends rearwardly from the rear of the front plate, the inner cap has a set of receiving spaces therein, the set of receiving spaces extending forwardly into the front plate along the central axis; the rear end of the outer cover body of the needle cover extends backwards in a protruding mode to form a plurality of alignment insertion pieces, the front end face of the connecting section of the shell of the outer sleeve shell forms a plurality of alignment concave parts, and the alignment concave parts are respectively used for correspondingly inserting the alignment insertion pieces.