CN209437802U - Automatically inject pen - Google Patents

Abstract

The purpose of the application is to provide a kind of automatic injection pen, it include: upper housing, lower case, syringe, for squeezing the piston rod of syringe inner space, it is arranged with the drive sleeve of piston rod, cutting ferrule is triggered, is set in drive sleeve, and the axial direction along upper housing is slidably connected with upper housing, for being in clamping connection piston rod；Sleeve is triggered, is set to inside lower case, and be slidably connected along the axial direction of lower case with it, for pushing triggering cutting ferrule along the axial movement of upper housing, so that pushing piston rod to squeeze syringe by drive sleeve after triggering cutting ferrule and piston rod disengaging are in clamping connection；Upper housing is rotatablely connected in its circumferential direction with lower case, when triggering cutting ferrule being made to be located at open position, can pass through triggering sleeve and push triggering cutting ferrule by the relative rotation between upper housing and lower case.Compared with prior art, the application can simplify the internal structure of automatic injection pen, reduce production cost.

Description

Automatically inject pen

Technical field

The utility model relates to a kind of medical injection pen more particularly to a kind of automatic injection pens.

Background technique

Pen, which is automatically injected, as a kind of common medical instrument can substitute manually inserting needle, injection etc., with accurate Dosage needed for squeezing out.

In existing automatic injection pen, as the specification of patent application document CN201611226505 discloses one kind Cassette full-automatic injecting pen needs just to be able to achieve releasing for syringe needle using cooperations such as button mechanism, cassette Yao Zhen mechanism, firing locks Put and inject, internal structure is complex, production cost is higher, affects its popularization and application, increase user purchase and Use burden.

Therefore, how to simplify the internal structure of automatic injection pen, reducing production cost is urgent problem.

Utility model content

The shortcomings that for the above-mentioned prior art or deficiency, the technical problem to be solved by the present invention is to provide a kind of automatic Injection pen can be realized the accurate control to transmission stroke, to meet the design requirement of high-precision transmission.

In order to solve the above technical problems, the utility model provides a kind of automatic injection pen, comprising: upper housing, lower case, Syringe is arranged with the drive sleeve of the piston rod for squeezing the piston rod of the syringe inner space, which is characterized in that Further include:

Cutting ferrule is triggered, is set in the drive sleeve, and is connected along the axial direction of the upper housing and upper housing sliding It connects, for being in clamping connection the piston rod；

Sleeve is triggered, is set to inside the lower case, and be slidably connected along the axial direction of the lower case with it, for pushing away The triggering cutting ferrule is moved along the axial movement of the upper housing, is connected so that the triggering cutting ferrule and the piston rod are detached from clamping After connecing, the piston rod is pushed to squeeze the syringe by the drive sleeve；

The upper housing is rotatablely connected in its circumferential direction with the lower case, to pass through the upper housing and the lower case Between relative rotation, when the triggering cutting ferrule being made to be located at open position, the triggering sleeve can be passed through and push the trigger card Set.

Compared with prior art, the application is slidably connected to upper housing, and and drive sleeve due to using triggering cutting ferrule Interior piston rod is in clamping connection, and triggering sleeve is set to inside lower case and is slidably matched with it, while upper housing is under Be rotatablely connected in the circumferential direction of upper housing between shell, therefore during use, user can by the rotation to upper housing, So that triggering cutting ferrule turns to be located at open position above triggering sleeve, or by the rotation to lower case, drive touching Hair fastener set turns to below triggering sleeve, so that triggering cutting ferrule is located at open position, and then by pushing triggering sleeve edge The axial movement of lower case then pushes triggering cutting ferrule, and to trigger cutting ferrule along the axial movement of upper housing, until trigger card After set is in clamping connection with piston rod disengaging, user can make drive sleeve push piston rod squeezing needle by modes such as pressings Cylinder realizes injection of the medicament to patient's body in syringe, simplifies the internal structure of automatic injection pen, reduces production cost.

Further, preferably, the drive sleeve includes: press section, the sleeve part being connected with the press section, opens The opening being located on the sleeve part, the elastic card buckle for being arranged on the sleeve part and being matched with the triggering cutting ferrule； The elastic card buckle protrudes into inside when being squeezed by the triggering cutting ferrule, by the outside of the opening, and with the piston rod Holding is in clamping connection, and after the extruding for losing the triggering cutting ferrule, it is in clamping connection with piston rod disengaging.

Further, preferably, the elastic card buckle at least two, and with the open amount phase one that opens up It causes.

Further, preferably, the elastic card buckle and the opening are two, and with the drive sleeve Central axes for line of symmetry be symmetrical arranged.

Further, preferably, the elastic card buckle include: positioned at the open outside and with the drive sleeve The elastic body of connection, be arranged on elastic body and for support the piston rod neck protrusion.

Further, preferably, the drive sleeve further include: along the protruding portion of the sleeve part being axially arranged, For making the drive sleeve and the upper housing be connected together and can be produced relative sliding along the axial direction of the upper housing.

Further, preferably, the press section is connected together with the upper housing；During the inside of the piston rod is Cavity body, and the internal sleeve of the hollow cavity is equipped with compressed spring, and the opposite end of the compressed spring supports institute respectively State the top of drive sleeve and the bottom of the hollow cavity.

Further, preferably, the triggering cutting ferrule includes: the axis hole offered for passing through the drive sleeve Ontology, the sliding slot being provided on the side wall of the ontology；The inner wall of the upper housing is axially arranged with along it for being slidably connected State the holding section of sliding slot.

Further, preferably, the inner wall of the axis hole offers groove body, and the depth of the groove body is along the axis hole Axial direction be inwardly gradually reduced by the end face of the axis hole.

Further, preferably, the tail end of the syringe is fixed in the upper housing or the lower case, described The head end of syringe is sheathed in the triggering sleeve；The opposite end of the triggering sleeve is respectively to be used to trigger the triggering The triggering end of cutting ferrule and outlet end for discharging the syringe needle being connected with the syringe；The triggering sleeve has part by hollow out shape At avoid area, and it is described avoid area and be axially facing the outlet end along it from the triggering end extending, for by described The tail end of syringe.

Further, preferably, the triggering sleeve includes: with the triggering for avoiding area and the triggering end Portion, the ring sleeve portion for being connect with the trigger unit and there is the outlet end；The outer wall of the trigger unit is equipped with axially extending along its And for cooperatively forming the raised line being slidably connected.

Further, preferably, it is equipped with guide plate inside the lower case, the guide plate is offered for across institute The pilot hole of syringe is stated, while there are the avoiding spaces for passing through the trigger unit between the lower case.

Further, preferably, the inner wall of the trigger unit is equipped with axially extending along its and is used to cooperate described in contact The convex ribs of guide plate when sliding the trigger unit towards the upper housing, keep open configuration.

Further, preferably, the automatic injection pen further include: be set to the triggering sleeve and the lower case Between and the limit sleeve that is connected together with the lower case, for carrying out locking to it after triggering sleeve reset.

Further, preferably, the hollow-out parts that the outer wall of the limit sleeve at least part is formed by hollow out；The limit Position set further include: the limit plate in the hollow-out parts is set；One end of the limit plate is connected with the ontology of the limit sleeve, And the other end is connected by interconnecting piece with the limit sleeve；The inside of the limit plate is equipped with to be adjacent to the inner wall of the lower case Lug boss, and its outside be equipped with dimpling portion；When the dimpling portion is broken the interconnecting piece because of the triggering sleeve extruding, And after triggering sleeve reset, avoided in area described in the rebound effect insertion by the lug boss.

Further, preferably, the lug boss is arc convex, and before interconnecting piece fracture, the protrusion It is interference fit between portion and the inner wall of the lower case.

Further, preferably, the dimpling portion is connected with the interconnecting piece, and the width of the interconnecting piece is described in The radial direction of limit sleeve is gradually reduced.

Further, preferably, the limit sleeve includes: the annular sheet equipped with the lug boss and the dimpling portion Body, the clamping portion being connected with the ring body；The clamping portion include: at least two with the central axis of the limit sleeve be pair Claim axial symmetry setting and the bar shape for being used to be connected together with the lower case, the bending body being connected with the bar shape；It is described The radially outer protrusion in outer wall at least part for triggering sleeve extends to form limiting section；Wherein, it is offered on the triggering sleeve Bayonet, for across the bending body.

Further, preferably, the automatic injection pen further include: the metal elastic in the triggering sleeve is set Spring, the opposite end of the metal spring support the inner edge surface of the bending body and the outlet end respectively.

Further, preferably, the inner wall of the upper housing is equipped with first baffle, matches with the first baffle Second baffle；The limit for being inserted into and being clamped the tail end of the syringe is formed between the first baffle and the second baffle Card slot；There are the triggerings for passing through the triggering end between the upper housing for the first baffle and the second baffle Space.

Further, preferably, the inner wall of the upper housing offers locating slot along its circumferential direction；The lower case is equipped with The insertion section of the locating slot is inserted into cooperation.

Further, preferably, the first detent and the second detent are equipped in the locating slot；The insertion section exists It is turned in the locating slot when being contacted with first detent, the triggering sleeve is located at lock position, and is turning to When contacting with second detent, the triggering sleeve is located at open position.

Further, preferably, the press section offer chip slot, for close the chip slot by gland, It is arranged in chip slot and for establishing the induction chip that wireless telecommunications are connect with external equipment.

Detailed description of the invention

By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other Feature, objects and advantages will become more apparent upon:

Fig. 1: the explosive view of pen is automatically injected in the utility model first embodiment；

Fig. 2: the external structure schematic diagram of pen is automatically injected in the utility model first embodiment；

The cross-sectional view of Section A-A in Fig. 3: Fig. 2；

The cross-sectional view of section B-B in Fig. 4: Fig. 2；

Fig. 5: the structural schematic diagram of cutting ferrule is triggered in the utility model first embodiment；

Fig. 6: the diagrammatic cross-section of upper housing in the utility model first embodiment；

Fig. 7: the structural schematic diagram of sleeve is triggered in the utility model first embodiment；

Fig. 8: the structural schematic diagram of one end of lower case and upper casing mates in the utility model first embodiment；

Fig. 9: the structural schematic diagram of the outlet end of lower case in the utility model first embodiment；

Figure 10: the schematic diagram of the section structure of lower case in the utility model first embodiment；

Figure 11: the external structure schematic diagram of limit sleeve in the utility model first embodiment；

Figure 12: the schematic diagram of internal structure of limit sleeve in the utility model first embodiment；

Figure 13: the structural schematic diagram of pen when in use is automatically injected in the utility model first embodiment；

Description of symbols: upper housing 1；Drive sleeve 2；Piston rod 3；Piston 4；Syringe needle 5；Lower case 7；Trigger cutting ferrule 8； Compressed spring 9；Syringe 10；Insertion section 11；Trigger sleeve 12；Limit sleeve 13；Syringe needle 14；Metal spring 16；First baffle 18；The Two baffles 19；Limit card slot 25；Hollow cavity 31；Tail end 100；Holding section 101；Locating slot 102；Buckle 103；First detent 104；Second detent 105；Press section 201；Sleeve part 202；Elastic card buckle 23；Protruding portion 203；Press gland 212；Incude core Piece 213；Guide sleeve 701；Guide plate 702；Pilot hole 703；Ontology 801；Groove body 802；Sliding slot 803；Side wall 804；Axis hole 805； Trigger unit 121；Ring sleeve portion 122；Raised line 123；Convex ribs 124；Avoid area 125；Bayonet 126；Limiting section 1211；Limit plate 130； Lug boss 131；Dimpling portion 132；Interconnecting piece 133；Clamping portion 134；Bar shape 1341；Bending body 1342；Bar shaped convex ribs 1343.

Specific embodiment

Make furtherly below with reference to technical effect of the attached drawing to the design of the utility model, specific structure and generation It is bright, to be fully understood from the purpose of this utility model, feature and effect.

As shown in figure 1 to figure 13, the first embodiment of the utility model provides a kind of automatic injection pen comprising: on Shell 1, lower case 7, syringe 10 are arranged with the drive sleeve of piston rod 3 for squeezing the piston rod 3 of 10 inner space of syringe 2, cutting ferrule 8, triggering sleeve 12 etc. are triggered；

Wherein, cutting ferrule 8 is triggered, is set in drive sleeve 2, and the axial direction along upper housing 1 is slidably connected with upper housing 1, For being in clamping connection piston rod 3.

Sleeve 12 is triggered, is set to inside lower case 7, and be slidably connected along the axial direction of lower case 7 with it, for pushing touching Hair fastener set 8 passes through actuating sleeve so that triggering cutting ferrule 8 and piston rod 3 are detached from after being in clamping connection along the axial movement of upper housing 1 Cylinder 2 pushes piston rod 3 to squeeze syringe 10.

Upper housing 1 is rotatablely connected in its circumferential direction with lower case 7, by opposite between upper housing 1 and lower case 7 Rotation when triggering cutting ferrule 8 being made to be located at open position, can pass through triggering sleeve 12 and push triggering cutting ferrule 8.

The application is slidably connected to upper housing 1 due to using triggering cutting ferrule 8, and blocks with the piston rod 3 in drive sleeve 2 It is tightly connected, and triggering sleeve 12 is set to 7 inside of lower case and is slidably matched with it, while between upper housing 1 and lower case 7 The structure being rotatablely connected in the circumferential direction of upper housing 1, therefore during use, user can by the rotation to upper housing 1, So that triggering cutting ferrule 8 turns to 12 top of triggering sleeve to be located at open position, or pass through the rotation to lower case 7, band Dynamic triggering cutting ferrule 8 turns to 12 lower section of triggering sleeve, so that triggering cutting ferrule 8 is located at open position, such as upper housing in Fig. 2 On mark key 106 started turning from the position with mark 107 face of key in lower case 7, until upper housing on mark key When 108 rotations are with mark 107 face of key, the location of triggering cutting ferrule 8, and then by pushing triggering sleeve 12 along lower case 7 Axial movement, then push triggering cutting ferrule 8, and make trigger cutting ferrule 8 along upper housing 1 axial movement, until triggering cutting ferrule 8 After being in clamping connection with the disengaging of piston rod 3, user can make drive sleeve 2 push 3 squeezing needle of piston rod by modes such as pressings Cylinder 10 realizes the injection of medicament in syringe 10, simplifies the internal structure of automatic injection pen, reduces production cost.

Specifically, as shown in fig. 6, the inner wall of the upper housing 1 in the present embodiment offers locating slot 102 along its circumferential direction； Lower case 7 is equipped with the insertion section 11 of cooperation insertion locating slot 102.To by mutual between locating slot 102 and insertion section 11 Cooperation, while facilitating upper housing 1 and lower case 7 is assembled, so that can produce relative rotation between upper housing 1 and lower case 7.

It is further used as preferably, as shown in fig. 6, can also be equipped with 104 He of the first detent in the present embodiment locating slot 102 Second detent 105.As shown in figure 5, insertion section 11 is turned in locating slot 102 when contacting with the first detent 104, triggering Sleeve 12 is located at lock position, i.e. the position of mark key 106 in Fig. 2 on upper housing and mark 107 face of key in lower case 7 Set, and turn to contacted with the second detent 105 when, i.e., on upper housing 1 mark key 108 and identify 107 face of key position When setting, triggering sleeve 12 is located at open position.To facilitate user in realization between shell 1 and lower case 7 while locking The unlock of syringe 10 is operated.

It is noted that the first detent 104 and the second detent 105 in the present embodiment are preferably locating slot 102 In protrusion, it is more preferred to, the protrusion be elastic bumps.

As shown in figure 3, the drive sleeve 2 in the present embodiment is mainly by press section 201, the set being connected with press section 201 Canister portion 202, the opening being provided on sleeve part 202, the elastic card for being arranged on sleeve part 202 and being matched with triggering cutting ferrule 8 Buckles 23 etc. are constituted.

As shown in Figures 1 to 5 it is found that elastic card buckle 23 is protruded into interior when the cutting ferrule 8 that is triggered is squeezed by the outside being open Portion, and be in clamping connection with the holding of piston rod 3, and after the extruding for losing triggering cutting ferrule 8, it is in clamping connection with the disengaging of piston rod 3.From And being in clamping connection by elastic card buckle 23 and piston rod 3, realization is to the locking of piston rod 3, so that drive sleeve 2 exists It can not push piston rod 3 to 10 Inner extrusion of syringe under external force, trigger drive sleeve 2 because of operation error to avoid user The phenomenon that, also, when user needs to inject, it can be when triggering cutting ferrule 8 be located at open position, by pushing up triggering sleeve The operation of the unlock to piston rod 3 can be realized in promotion of the modes such as 12 to triggering cutting ferrule 8.

It is further preferred that as shown in Figure 1, drive sleeve 2 further include: along the protruding portion of sleeve part 202 being axially arranged 203, for making drive sleeve 2 and upper housing 1 be connected together and can be produced relative sliding along the axial direction of upper housing 1.It is driven with facilitating Positioning and assembly between moving sleeve 2 and upper housing 1.

It is further preferred that press section 201 is connected together with upper housing 1, as shown in through Fig. 5, by setting Set on upper housing 1 buckle 103 and press section 201 on the card slot (not identified in figure) that opens up fasten to connect and realize；It is living The inside of stopper rod 3 is hollow cavity 31, and the internal sleeve of hollow cavity 31 is equipped with compressed spring, and opposite the two of compressed spring End supports the top of drive sleeve 2 and the bottom of hollow cavity respectively.So that piston rod 3 and drive sleeve 2 are in compressed spring Elastic reaction under keep preferably mutually supporting, to be pushed away after piston rod 3 is unlocked by the rebound effect of compressed spring Injection of the piston bar 3 in syringe 10, and then realize automatic injection, meet the needs of disposable full-automatic injecting.In addition, logical It crosses between press section 201 and upper housing 1 and is connected together, can prevent drive sleeve 2 from going out after mounting in compressed spring in rebound Now slide and influence the automatic injection of piston rod 3.

It is noted that in order to meet the assembly demand in practical application, in the present embodiment, elastic card buckle 23 is at least It is two, and consistent with the open amount opened up.

As it is further preferred that elastic card buckle 23 and opening in the present embodiment are two, and with actuating sleeve The central axes of cylinder 2 are symmetrical arranged for line of symmetry, to avoid piston rod 3 during being in clamping connection with elastic card buckle 23, out The phenomenon that now tilting, to guarantee that axial direction of the piston rod 3 under the action of compressed spring along syringe 10 steadily moves.

It is further used as preferably, elastic card buckle 23 includes: positioned at open outside and the bullet that connect with drive sleeve 2 Property ontology, be arranged on elastic body and for support piston rod 3 neck protrusion.

As shown in Fig. 3, Fig. 4 and Fig. 5, the triggering cutting ferrule 8 in the present embodiment can be by offering for across drive sleeve 2 The ontology 801 of axis hole 805 of sleeve part 202, the sliding slot 803 that is provided on the side wall 804 of ontology 801 etc. constitutes.Wherein, on The inner wall of shell 1 is axially arranged with the holding section 101 for the sliding slot 803 that is slidably connected along it.So that triggering cutting ferrule 8 is being triggered It, can be along the axial smooth sliding of upper housing 1 when sleeve 12 pushes.Due to the simple and ingenious structure of the triggering cutting ferrule 8, preferable While realizing 3 locking of piston rod, the production cost of triggering cutting ferrule 8 is reduced.

In addition, it is further preferred that as shown in figure 5, the inner wall of the axis hole 805 of the triggering cutting ferrule 8 offers groove body 802, And the depth of groove body 802 being inwardly gradually reduced along the axial of axis hole 805 by the end face of axis hole 805 so that triggering cutting ferrule 8 with drive When moving sleeve 2 assembles, there is stuck phenomenon.

As shown in Figure 3 and Figure 4, as preferred mode, the tail end of syringe 10 is fixed on upper housing 1, syringe 10 Head end is sheathed in triggering sleeve 12.

Also, as shown in fig. 7, triggering sleeve 12 opposite end be respectively be used to trigger triggering cutting ferrule 8 triggering end and For discharging the outlet end for the syringe needle being connected with syringe 10；Meanwhile triggering sleeve 12 has part to avoid area by what hollow out was formed 125, and avoid area 125 and be axially facing outlet end extension along it from triggering end, with the tail end for passing through syringe 10.So that Triggering cutting ferrule 8 is when being located at open position, triggers sleeve 12 and is being squeezed when moving axially upward, can avoid syringe 10 The equal blocking of tail end 100 and sliding axially upwards along upper housing 1 pushes its fortune and after offseting with triggering cutting ferrule 8 It is dynamic.

Specifically, as shown in fig. 7, triggering sleeve 12 in the present embodiment is mainly to avoid area 125 and triggering end by having Trigger unit 121, the ring sleeve portion 122 for being connect with trigger unit 121 and there is outlet end；The outer wall of trigger unit 121 is equipped with along its axial direction Extend and form the raised line 123 being slidably connected etc. and constitutes.So that triggering sleeve 12 can be slidably connected with realizing in lower case While, by the protective effect of ring sleeve portion 122, syringe 10 and syringe needle is prevented to be exposed to the outside of automatic injection pen.

It is further preferred that as shown in figure 8, being equipped with guide plate 702 inside lower case 7, guide plate 702, which offers, to be used for Across the pilot hole 703 of syringe, while between lower case 7, there are the avoiding spaces for passing through trigger unit 121.In order to needle The guiding of cylinder 10, and while not influencing to trigger the sliding of sleeve 12, limited by 702 pairs of triggering 12 strokes of sleeve of guide plate System prevents triggering sleeve 12 and slides into too deep along the direction of upper housing 1 and be difficult to the phenomenon that extracting.

It should be noted that as shown in Figure 9 and Figure 10, it is further preferred that the automatic injection pen in the present embodiment may be used also To include: the guide sleeve 701 for being set to 7 inside of lower case and being connected with lower case 7, matched with above-mentioned guide plate 702, and lead To between set 701 and lower case 7 there are sliding space, for across triggering end, to pass through guide sleeve 701 and pilot hole 703 It cooperates, the phenomenon that being oriented to the head end of syringe 10, prevent syringe 10 from shaking in use.

It is further preferred that the inner wall of the trigger unit 121 in the present embodiment is equipped with axially extending along its and is used to match splice grafting The convex ribs 124 for touching guide plate 702 make trigger unit 121 towards when upper housing sliding, keep open configuration.To prevent due to triggering Sleeve when in use, the phenomenon that triggering end collapses and cause to misplace so that triggering sleeve 12 cannot be triggered precisely Phenomenon.It should be noted that convex ribs 124 and raised line 123 in the present embodiment be located at it is same radially so that trigger unit 121 Opposite sides is in contact with limit plate 130 and lower case respectively, can keep opening while preferable formation is slidably connected State.

In addition, as shown in figure 8, as a further preference, automatically injecting pen further include: be set to triggering sleeve 12 under The limit sleeve 13 being connected together between shell 7 and with lower case 7, for carrying out locking to it after triggering sleeve 12 resets.With The phenomenon that avoiding syringe needle 14 from being exposed to outside when not in use and easily cause accidental injury.

Specifically, as is illustrated by figs. 11 and 12, the outer wall of limit sleeve 13 at least part is formed by hollow out in the present embodiment Hollow-out parts；Limit sleeve 13 further include: the limit plate 130 in hollow-out parts is set；One end of limit plate 130 and 13 phase of limit sleeve Connect, and the other end is connected by interconnecting piece 133 with the ontology of limit sleeve 13；The inside of limit plate 130 be equipped with in lower case 7 The lug boss 131 that wall is adjacent to, and its outside is equipped with dimpling portion 132；When dimpling portion 132 makes interconnecting piece because triggering due to sleeve 12 squeezes 133 fractures, and after triggering sleeve 12 resets, it is avoided in area 125 by the rebound effect insertion of lug boss 131.

It follows that, since dimpling portion 132 is smaller, being triggered when lug boss 131 is compressed by the inner wall of lower case When being used up for the first time of sleeve 12 will not can make interconnecting piece 133 be broken the biggish blocking of generation under its impact, And further expression lobes portion 131, thus after automatically injecting pen completion injection, i.e., after the reset of triggering sleeve 12, lug boss 131 , can be under the rebound effect of itself due to not limited by interconnecting piece 133, that is inserted into triggering sleeve 12 avoids area 125, and then makes Sleeve 12 must be triggered to push again up, triggering sleeve 12 is limited, therefore is set by the structure of above-mentioned limit sleeve 13 Meter, design is marvellous, and structure is simple, reduces and manufactures cost, and is easily assembled and dismantles.

Further, preferably, lug boss 131 be arc convex, and interconnecting piece 133 fracture before, lug boss 131 with It is interference fit between the inner wall of lower case 7.To be reduced between lug boss 131 and the outer wall of lower case 7 by arc convex Contact area, so that triggering sleeve 12 is after the reset, lug boss 131, which can quickly rebound, avoids area to triggering sleeve 12 In 125, to form the locking to triggering sleeve 12.

Further, preferably, dimpling portion 132 is connected with interconnecting piece 133, and the width of interconnecting piece 133 is along limit sleeve 13 radial direction is gradually reduced, with while guaranteeing the bonding strength between limit plate 130 and 13 ontology of limit sleeve, so that connection Portion 133 is easy to be broken after by the impact for meeting design requirement.

In addition, avoiding syringe needle 14 by two to the maximum extent to enhance the position-limiting action of 13 pairs of limit sleeve triggering sleeves 12 Secondary exposure, lug boss 131 and dimpling portion 132 in the present embodiment can be two or more, and be to trigger the axis of sleeve 12 Setting substantially symmetrical about its central axis.It should be noted that the present embodiment is only explained so that lug boss 131 and dimpling portion 132 are two as an example.

In addition, should be it is understood that the foot that the size in the dimpling portion 132 in the present embodiment needs to be arranged for those skilled in the art It is enough small, about between several millimeters, so that triggering sleeve 12 will not constitute obstruction when being triggered for the first time to it.

In detail, in the present embodiment, as further preferably, above-mentioned limit sleeve 13 can be by being equipped with lug boss 131 It is constituted with the ring body in dimpling portion 132, the clamping portion being connected with ring body 134 etc..Wherein, clamping portion includes: at least two A bar shape 1341 and item for being symmetrical arranged using the central axis of limit sleeve 13 as symmetry axis and being used to be connected together with lower case 7 The connected bending body 1342 of body 1341；The radially outer protrusion in the outer wall of trigger unit 121 at least part extends to form limiting section 1211；Wherein, it triggers on sleeve 12 and offers bayonet 126, for across bending body 1342.To realize limit sleeve 13 in lower casing While being fixedly connected on body 7, position-limiting action is played in the movement travel for triggering sleeve 12 by 1342 pairs of bending body, prevents from triggering Sleeve 12 is detached from from lower case 7.Wherein, the present embodiment is only explained by taking two bar shapes 1341 and bending body 1342 as an example, And in practical applications, it can also be other numbers, such as three, four other numbers, the present embodiment does not make this to have The restriction and explanation of body.

In addition, with this configuration, realizing limit sleeve 13 and triggering the connection between sleeve 12, so that lower case 7 does not have to It is slidably connected by way of opening up sliding groove with the formation of raised line 123 of triggering sleeve 12, can also follow limit sleeve 13 under Shell 7 rotates together with, and the sliding row axial along lower case 7 to triggering sleeve 12 is realized by the length of control bayonet 126 The control of journey is slidably connected to realize.Herein it is noted that the present embodiment is by raised line for the slip connection mode Mutual cooperation or raised line 123 and convex ribs 124 between 123 and the sliding groove that is provided in lower case 7 is in lower case 7 and limit Limit cooperation between the plate 130 of position, or by the connection of limit sleeve 13 with and combinations thereof come what is realized, do not limit specifically Fixed and explanation.

In addition, as shown in figure 8, the outer wall of the bar shape of the present embodiment is equipped with bar shaped convex ribs 1343, for insertion under In the groove body (not indicating in figure) opened up on shell 7, realization is connected together.

It is further used as preferably, pen being automatically injected in the present embodiment further include: the metal in triggering sleeve 12 is arranged in Spring 16, the opposite end of metal spring 16 support the inner edge surface of bending body 1342 and outlet end respectively.So that automatic injection For pen after the completion of injection, triggering sleeve 12 can return back to initial position under the rebound effect of metal spring 16, and make needle First 14 are covered by protection zone, to avoid there is the phenomenon that user accidentally touches syringe needle 14 in subsequent use process.Meanwhile passing through folding The bending of curved body 1342 designs, after integrated assembling being carried out with triggering sleeve 12 by limit sleeve 13 convenient for metal spring 16, It is inserted into from one end that lower case 7 is used to connect upper housing 1, convenient for automatically injecting the assembly of pen.

It is further used as preferably, as shown in fig. 6, the inner wall of the upper housing 1 in the present embodiment is also provided with first gear Plate 18, the second baffle 19 matched with first baffle 18.Wherein, it is formed and is used between first baffle 18 and second baffle 19 Be inserted into and be clamped the limit card slot 25 of the tail end 100 of syringe 10, also, first baffle 18 and second baffle 19 with upper housing 1 Between there are the triggering spaces for passing through triggering end, to realize positioning to syringe 10, prevent syringe 10 in automatic injection pen Use process in the phenomenon that shaking, and the phenomenon that prevent upper housing 1 and lower case 7 from separating when in use, together When, first baffle 18 can also be when piston rod 3 be in the lock state, to the barrier effect of triggering sleeve 12, so that triggering sleeve 12 can not push triggering cutting ferrule 8, and be located at open position by the rotation of upper housing 1 or lower case 7 when triggering cutting ferrule 8, that is, touch When hair net 12 top of cylinder, the triggering end for triggering sleeve 12 can push triggering cutting ferrule 8 after through triggering space.

It is noted that the first baffle 18, second baffle 19 and limit card slot 25 in the present embodiment are both preferably two It is a, and be symmetrical arranged by symmetry axis of the central axes of drive sleeve 2.

In addition, as shown in Figure 1 and Figure 4, scheme as a further preference, the press section of drive sleeve 2 in the present embodiment Inside can also offer chip slot, for close chip slot by gland 212, be arranged in chip slot and for building with external equipment The induction chip 213 of vertical wireless telecommunications connection, so that when external equipment is close to the press section of the automatic injection pen, it can be by outer Portion's equipment obtains the relevant information stored in induction chip 213, such as the model of the medical injection device, dosage, ingredient, producer Information is transmitted in external equipment, and is able to carry out corresponding data exchange, to facilitate the relevant information of user query and accurate Identification, prevents the phenomenon that mistake is taken.In addition, can also be stored in induction chip 213 by data exchange according to actual needs Corresponding information, to make information backup inquiry, subsequent use and analyze.

In order to illustrate in the working principle of the present embodiment, the following operating process sketched in the present embodiment is as follows, leads to Rotatable top shell 1 or lower case 7 are crossed, so that triggering cutting ferrule 8 is located at corresponding open position, i.e., identifies key 108 and mark in figure When knowing the position of 107 face of key, user is directed at the position for needing to inject for pen is automatically injected, and holds automatic injection pen, presses downwards When pressure, as shown in figure 13, syringe needle can expose from triggering sleeve 12, and the triggering end of triggering sleeve 12 can be by first baffle 18 Restriction under, along lower case 7 axially across the reserved space between guide plate 702 and lower case 7, and pass through first baffle 18 and second baffle 19 between upper housing 1 there are for pass through triggering end triggering space after, squeeze triggering cutting ferrule 8 simultaneously make It obtains metal spring 16 further to compress, so that piston rod 3 is released, and then piston rod 3 is in the rebound effect of compressed spring 9 Under, so that piston rod 3 squeezes the medicament in syringe 10, and then the injection volume of complete design, thus when automatic injection pen has been injected Afterwards, triggering sleeve 12 resets under the rebound effect of metal spring 16, and due to the interconnecting piece of the limit plate of limit sleeve 13 130 133 are thrust before triggering sleeve 12 is injected, so that dimpling portion 132 is inserted into triggering under the rebound effect of lug boss 131 Sleeve 12 is avoided in area 125, thus the case where realizing the locking to triggering sleeve 12, avoiding secondary accidental injury.

Furthermore it should be noted that the above-mentioned each further preferred scheme being related to of the present embodiment, is according to actual conditions Increase or improved technical solution, to solve corresponding technical problem, therefore its part for being related to and structure for how Realize to transmission stroke accurate control, with meet high-precision transmission design requirement the technical issues of for, be not necessity , it can be configured according to practical situation, and the present embodiment does not make specifically restriction and explanation to this.

Above embodiments are only to illustrate the technical solution of the utility model and non-limiting, reference only to preferred embodiment pair The utility model is described in detail.Those skilled in the art should understand that can be to the technology of the utility model Scheme is modified or equivalent replacement, without departing from the spirit and scope of the technical scheme of the present invention, should all cover in this reality With novel scope of the claims.

Claims (23)

1. a kind of automatic injection pen, comprising: upper housing, lower case, syringe, the piston for squeezing the syringe inner space Bar is arranged with the drive sleeve of the piston rod, which is characterized in that further include:

Cutting ferrule is triggered, is set in the drive sleeve, and be slidably connected along the axial direction of the upper housing and the upper housing, is used In being in clamping connection the piston rod；

Sleeve is triggered, is set to inside the lower case, and be slidably connected along the axial direction of the lower case with it, for pushing Triggering cutting ferrule is stated along the axial movement of the upper housing, so that the triggering cutting ferrule is in clamping connection with piston rod disengaging Afterwards, the piston rod is pushed to squeeze the syringe by the drive sleeve；

The upper housing is rotatablely connected in its circumferential direction with the lower case, by between the upper housing and the lower case Relative rotation, when the triggering cutting ferrule being made to be located at open position, the triggering sleeve can be passed through and push the triggering cutting ferrule.

2. automatic injection pen according to claim 1, which is characterized in that the drive sleeve include: press section, with it is described The connected sleeve part in press section, the opening being provided on the sleeve part, be arranged on the sleeve part and with the trigger card Cover the elastic card buckle matched；

The elastic card buckle protrudes into inside when being squeezed by the triggering cutting ferrule, by the outside of the opening, and with the work Stopper rod holding is in clamping connection, and after the extruding for losing the triggering cutting ferrule, it is in clamping connection with piston rod disengaging.

3. automatic injection pen according to claim 2, which is characterized in that the elastic card buckle at least two, and with The open amount opened up is consistent.

4. automatic injection pen according to claim 2, which is characterized in that the elastic card buckle and it is described opening be two It is a, and be symmetrical arranged by line of symmetry of the central axes of the drive sleeve.

5. automatic injection pen according to claim 2, which is characterized in that the elastic card buckle includes: to be located at described open Mouth outside and the elastic body being connect with the drive sleeve, the neck for being arranged on elastic body and being used to support the piston rod The protrusion in portion.

6. automatic injection pen according to claim 2, which is characterized in that the drive sleeve further include: along the sleeve The protruding portion being axially arranged in portion, for making the drive sleeve and the upper housing be connected together and can be along the upper housing Axially produce relative sliding.

7. automatic injection pen according to claim 2, which is characterized in that the press section engages company with the upper housing It connects；The inside of the piston rod is hollow cavity, and the internal sleeve of the hollow cavity is equipped with compressed spring, and the compression bullet The opposite end of spring supports the top of the drive sleeve and the bottom of the hollow cavity respectively.

8. automatic injection pen according to claim 1, which is characterized in that the triggering cutting ferrule includes: to offer for wearing The sliding slot crossing the ontology of the axis hole of the drive sleeve, being provided on the side wall of the ontology；

The inner wall of the upper housing is axially arranged with the holding section for the sliding slot that is slidably connected along it.

9. automatic injection pen according to claim 8, which is characterized in that the inner wall of the axis hole offers groove body, and institute The depth for stating groove body is inwardly gradually reduced along the axial of the axis hole by the end face of the axis hole.

10. automatic injection pen according to any one of claim 1 to 9, which is characterized in that the tail end of the syringe is consolidated Due on the upper housing or the lower case, the head end of the syringe is sheathed in the triggering sleeve；The triggering set The opposite end of cylinder is respectively to be used to trigger the triggering end of the triggering cutting ferrule and for discharging the syringe needle being connected with the syringe Outlet end；

The triggering sleeve has part to avoid area by what hollow out was formed, and described avoid area and be axially facing from the triggering end along it The outlet end extends, with the tail end for passing through the syringe.

11. automatic injection pen according to claim 10, which is characterized in that the triggering sleeve includes: to have described keep away The trigger unit for opening area and the triggering end, the ring sleeve portion for being connect with the trigger unit and there is the outlet end；The trigger unit Outer wall be equipped with and formed described in the raised line that is slidably connected axially extending along its.

12. automatic injection pen according to claim 11, which is characterized in that be equipped with guide plate, institute inside the lower case It states guide plate to offer for the pilot hole across the syringe, while there are for across the touching between the lower case The avoiding space in hair portion.

13. automatic injection pen according to claim 12, which is characterized in that automatic injection pen can also include: to be set to The guide sleeve being connected inside the lower case and with the lower case, matches, and guide sleeve and lower case with the guide plate Between there are sliding space, for across the triggering end.

14. automatic injection pen according to claim 12, which is characterized in that the inner wall of the trigger unit is equipped with along its axial direction Extend and be used to cooperate the convex ribs for contacting the guide plate, when sliding the trigger unit towards the upper housing, keeps opening State.

15. automatic injection pen according to claim 10, which is characterized in that the automatic injection pen further include: be set to The limit sleeve being connected together between the triggering sleeve and the lower case and with the lower case, in the triggering sleeve Locking is carried out to it after reset.

16. automatic injection pen according to claim 15, which is characterized in that the outer wall of the limit sleeve at least part quilt The hollow-out parts that hollow out is formed；

The limit sleeve further include: the limit plate in the hollow-out parts is set；One end of the limit plate and the limit sleeve It is connected, and the other end is connected by interconnecting piece with the limit sleeve；

The inside of the limit plate is equipped with the lug boss being adjacent to the inner wall of the lower case, and its outside is equipped with dimpling portion；

When the dimpling portion is broken the interconnecting piece because of the triggering sleeve extruding, and after the triggering sleeve resets, It is avoided in area described in rebound effect insertion by the lug boss.

17. automatic injection pen according to claim 16, which is characterized in that the lug boss is arc convex, and in institute It is interference fit between the lug boss and the inner wall of the lower case before stating interconnecting piece fracture.

18. automatic injection pen according to claim 16, which is characterized in that the dimpling portion is connected with the interconnecting piece, And the width of the interconnecting piece is gradually reduced along the radial direction of the limit sleeve.

19. automatic injection pen according to claim 16, which is characterized in that the limit sleeve includes: equipped with the protrusion The ring body in portion and the dimpling portion, the clamping portion being connected with the ring body；

The clamping portion include: at least two using the central axis of the limit sleeve as symmetry axis be symmetrical arranged and for it is described under Bar shape that shell is connected together, the bending body being connected with the bar shape；

The radially outer protrusion in outer wall at least part of the triggering sleeve extends to form limiting section；

Wherein, bayonet is offered on the triggering sleeve, for across the bending body.

20. automatic injection pen according to claim 19, which is characterized in that the automatic injection pen further include: setting exists Metal spring in the triggering sleeve, the opposite end of the metal spring support the bending body and the outlet end respectively Inner edge surface.

21. automatic injection pen according to claim 10, which is characterized in that the inner wall of the upper housing is equipped with first gear Plate, the second baffle matched with the first baffle；It is formed between the first baffle and the second baffle for being inserted into And it is clamped the limit card slot of the tail end of the syringe；The first baffle and the second baffle stay between the upper housing There is the triggering space for passing through the triggering end.

22. automatic injection pen according to claim 1, which is characterized in that the inner wall of the upper housing is opened up along its circumferential direction There is locating slot；The lower case is equipped with the insertion section that the locating slot is inserted into cooperation.

23. automatic injection pen according to claim 22, which is characterized in that in the locating slot be equipped with the first detent and Second detent；The insertion section turns in the locating slot when contacting with first detent, the triggering sleeve Positioned at lock position, and turn to contacted with second detent when, the triggering sleeve is located at open position.