CN208905879U - Calibrated shot pen with hiding injection needle - Google Patents

Abstract

The utility model relates to a kind of calibrated shot pens with hiding injection needle, it includes pen container, dosage adjusts and display knob, propulsive mechanism and the needle assembly that pen container front end is arranged in, the needle assembly has the needle protective being telescopically arranged, and needle protective hides injection needle in stretching state under non-injection state；When dosage is adjusted, the screw position in propulsive mechanism is constant, so as to accurately control the forward travel distance of screw rod in injection process, realizes calibrated shot.

Description

Calibrated shot pen with hiding injection needle

Technical field

The utility model relates to a kind of injection pens, have hiding injection needle more particularly, to one kind and injection dosage can essence The injection pen really controlled.

Background technique

Injection pen can be used for the injection of the injection drugs such as insulin, interferon, growth hormone, its advantage is that it is easy to use, It can voluntarily complete to inject by patient.

Chinese patent literature CN103170038A discloses a kind of insulin injection pen comprising pen cap, syringe needle, injection Pipe, injection casing, positioning wedged block, screw rod, nut pipe, fixing pipe, coil and button, screw rod two lateral edges axial direction difference cut-out Screw thread forms two sections parallel to each other, and screw rod is coupled with the internal screw thread of nut pipe, and screw front end is pressure head, and the injection pen is also Including rotating handle main spring, the outer end that rotating handle is located at the injection pen is the side opposite with pen cap, and coil outer end is set It sets inside rotating handle and is fixed with rotating handle, the other end and the nut pipe clamp of coil connect, and positioning wedged block is nested in coil It is clamped outside and with coil；Nut pipe is arranged between pressure head and positioning wedged block；Main spring is nested on coil, main spring One end and the inside of rotating handle are fixed, and the other end and the positioning wedged block of main spring are fixed.

Chinese patent literature CN106139325A discloses a kind of injection pen, comprising recycling propulsion device and medicine bottle sheath body, To combine flask for medicinal preparations and syringe needle, circulation propulsion device includes engagement member, screw shell, spiral duct, screw propulsion pipe, spiral shell Female connector ring, pushing ram, single direction ratchet ring and injection operation component, when injection, with the single direction ratchet ring and screw propulsion on push rod The combination of the unidirectional ratchet groove portion of pipe, constrains the direction of rotation of push rod and screw propulsion pipe, and pushing ram is limited by engagement member And can not rotate, screw shell is protruded into the clearance groove of screw propulsion pipe with axial non-return elastic slice, and guiding convex block, which is located at length, leads In slot, screw propulsion pipe is only capable of promoting together with injection operation component, the spiral guide block of screw propulsion pipe and the drive of spiral duct The threaded of dynamic helical guide groove, driving spiral duct forward rotate, and after screw propulsion pipe promotes, utilize the spiral of screw shell Slot is spirally connected with screw propulsion pipe to be combined and can not turn back, until completing calibrated shot.

Above-mentioned injection pen is all syringe needle in use as it can be seen that since injection pen is usually voluntarily to be used by patient, is made With not only patient being easy to cause to injure unexpectedly in the process, but also patient can be allowed to generate the feared state of mind；In addition, in order to realize preferably Therapeutic effect, injection dosage are preferably capable of voluntarily being carried out by patient accurately adjusting and controlling.

Summary of the invention

The main purpose of the utility model is to provide a kind of with hiding injection needle and injection dosage accurately controls Injection pen.

It is provided by the utility model with the calibrated shot for hiding injection needle in order to realize above-mentioned main purpose Pen, comprising:

Pen container, including upper shell interconnected and lower shell, the inner circumferential of upper shell are formed with the first internal screw thread and are located at The first radial protrusion below first internal screw thread；

Dosage adjusts and display knob, and periphery is formed with the graduation mark being spirally distributed and screws with the first internal screw thread External screw thread；Dosage is adjusted and the upper end of display knob stretches out in upper shell, and lower end has annular bottom wall and is located at the first radial direction The top of protrusion is formed with the first ratchet on the inside of annular bottom wall；

Lining core is fixed in upper shell, and is located at the lower section of the first radial protrusion；Spiral shell in second is provided in lining core Line；

Drug storage component, including the pen core frame being arranged in lower shell and the clamped bottle being arranged in pen core frame；

Needle assembly, including injection needle, needle protective and the first resilient compressible member being arranged in needle protective；Injection Needle is connect with the lower end of pen core frame, and needle protective is telescopically disposed in the lower end of lower shell, the configuration of the first resilient compressible member Injection needle is hidden to stretch out needle protective, needle protective has for injection needle under injection state The hole passed through；

Propulsive mechanism, including release button, screw rod, limit push rod, rotating push-rod, caudal peduncle connect cylinder, the second ratchet, clutch spine Wheel and the second resilient compressible member, screw rod, limit push rod, rotating push-rod, caudal peduncle connect cylinder and dosage adjusts and display knob is in diameter It setting gradually from inside to outside upwards, release button is axially displaceably arranged in dosage adjusting and shows the top of knob, and first Resilient compressible member setting connects between cylinder and release button in caudal peduncle, rotating push-rod have in the axial direction by the first radial protrusion and The second radial protrusion that lining core is positioned, the second ratchet and clutch ratchet are set on rotating push-rod, and the second ratchet and caudal peduncle connect The lower gap cooperation of cylinder, clutch ratchet are presented axially between the first ratchet and the second ratchet；

Wherein, the second ratchet arrangement be with rotating push-rod keep rotate synchronously, clutch ratchet be then configured to can relative to turn Dynamic push rod rotation；The lower end of clutch ratchet is formed with the third ratchet engaged with the first ratchet, and upper end is formed with and the second ratchet 4th ratchet of engagement, the transmission direction and the transmission direction phase of the second ratchet and the 4th ratchet of the first ratchet and third ratchet Instead；

It is formed between rotating push-rod and lining core so that rotating push-rod makees the ratchet mechanism one-directionally rotated in injection process, Screw arrangement is one-directional rotation synchronous with rotating push-rod and pushes the sealing piston of clamped bottle to make direction in synchronous one-directional rotation The forward travel of injection needle；

Caudal peduncle connects cylinder and is configured to adjust and show that knob is rotated synchronously with dosage, and the inner circumferential that caudal peduncle connects cylinder is formed by along axis To the guide groove of extension, the periphery for limiting push rod is formed with the first guide protrusions being arranged in guide groove, limits the interior of push rod Week has third internal screw thread, and screw rod is screwed with the second internal screw thread and third internal screw thread.

By above technical scheme as it can be seen that injection needle is hidden under non-injection state by needle protective, when injection, protects syringe needle Lid alignment injection site is pressed, and needle protective overcomes the active force of the first resilient compressible member to inside contract back towards lower shell, from And make injection needle pass through needle protective and penetrate patient injection site, patient can't see syringe needle in injection process, avoid trouble Person's injured possibility in use, also eliminates patient to the fear of injection needle.

When dosage is adjusted, dose adjusts and display knob (such as rotating clockwise), and dosage adjusts and display knob On move to required scale, caudal peduncle and cylinder and dosage adjust and display knob together with rotate and in the band of clutch ratchet and the second ratchet It is moved up under dynamic, jumps tooth space since clutch ratchet and the second ratchet exist at this time (the second elastic compression part at this time can be further Compression), dosage is adjusted and display knob is unable to drive rotating push-rod and screw rod rotation；At the same time, rotating push-rod and lining core it Between ratchet mechanism prevent rotating push-rod rotate, and then prevent screw rod rotate, limit push rod under the drive that caudal peduncle connects cylinder around spiral shell Bar is rotated and is moved up.If dosage is adjusted excessively, it can be reversed dose and adjust and show knob (such as rotation counterclockwise) It is displaced downwardly to required scale, when reversely rotating dosage adjusting and display knob, screw rod can not equally be rotated, and limit push rod is then It rotates and moves down.It can be seen that limiting pushrod movement, screw rod position during dosage is adjusted and shows the bidirectional rotation of knob It sets, remains constant, to realize the accurate adjusting to injection dosage；Clutch ratchet or the second ratchet are when dosage is adjusted Make to jump tooth movement and generate and jump dental prompt, be operated convenient for patient.

When injection, needle protective alignment injection site is subjected to pressing completion injection needle and is penetrated, release button is then pressed, Release button squeezes caudal peduncle and connects cylinder and dosage adjusting knob and the two is rotated, and caudal peduncle connects cylinder rotation and limit push rod is driven to rotate simultaneously It moves down；At this point, clutch ratchet and the second ratchet are there is no tooth space is jumped, dosage is adjusted and display knob drives clutch spine Wheel, the second ratchet and rotating push-rod rotation, rotating push-rod rotation drive screw rod rotation to move ahead, and screw rod, which moves ahead, squeezes prepackage medical fluid Sealing piston in clamped bottle moves ahead, and sealing piston, which moves ahead, squeezes the pre- medical fluid in clamped bottle, has the medical fluid of pressure to pass through Injection needle is injected in vivo, and completes injection.Since limit push rod is identical with screw rod angular speed, the distance that screw rod advances is equal to dosage tune The displacement that push rod is limited when section, so that injection dosage is precisely controlled.

A kind of specific embodiment according to the present utility model, the front end of needle protective are provided with flexible rubber ring.Elastic gum The skin contact in the injection pen injection process with patient is enclosed, the comfort of patient can be increased.

Another specific embodiment according to the present utility model is fixedly installed the pad around pen core frame front end in lower shell Circle, the first resilient compressible member are the compressed spring that both ends are abutted with needle protective and washer respectively.

Yet another embodiment according to the present utility model is provided with the guide and limit axially extended in lower shell Slot is formed with the second guide protrusions being slidably disposed in guide and limit slot on needle protective.Guide and limit slot and second Guide protrusions cooperate so that needle protective swimmingly telescopic slide in the axial direction.

Yet another embodiment according to the present utility model, upper shell include upper substrate and the view that is arranged in upper substrate Window, the first internal screw thread are formed in the inner peripheral surface of form；Top of substrate has the card hole through its peripheral wall, form periphery tool on this There is the convex block being packed into the card hole.

Yet another embodiment according to the present utility model, axially cut-out screw thread forms two to two lateral edge of screw rod respectively A section parallel to each other is formed with the second axially extending guide groove on the section, and the lower end in rotating push-rod, which is formed with, to be set Set the third radial protrusion in the second guide groove；The top of third radial protrusion is arranged in limit push rod.Third radial protrusion It is bonded in the second guide groove, improves the stability and reliability cooperated between rotating push-rod and screw rod.

Yet another embodiment according to the present utility model, the upper end that caudal peduncle connects cylinder form the tubing string with tubing string hole, There is the axis of a cylinder protruded into tubing string hole, the second elastic compression part is the compression bullet being set on axis of a cylinder and tubing string in release button Spring.Release button is pressed, release button is connected by axis of a cylinder to caudal peduncle while adjusting display knob application pressure to dosage Cylinder applies pressure.

Yet another embodiment according to the present utility model, ratchet mechanism include the spine for being formed in lining core inner peripheral surface upper end Take turns and be formed in the ratchet on the second radial protrusion periphery arc cantilever.When dosage is adjusted, the ratchet and the ratchet cooperate, resistance Only rotating push-rod rotates；In injection process, rotating push-rod is rotated, and the ratchet inclined surface of ratchet and the ratchet on arc cantilever connects It touches and the flexible deformation towards on the inside of the second radial protrusion occurs, allow the ratchet to skip the ratchet, which will not hinder Only rotating push-rod rotates；Meanwhile the ratchet is made to jump tooth movement and generate and jump dental prompt, operates convenient for patient.

Yet another embodiment according to the present utility model, the end of screw rod have the limit that can be proceeded in limit push rod Position end, limit end and third screw-internal thread fit and limit the maximum forward travel distance of screw rod；The front end of screw rod has for pushing away The plunger of sealing piston in dynamic clamped bottle.

The inner peripheral surface shape of yet another embodiment according to the present utility model, the outer peripheral surface of rotating push-rod and the second ratchet At there is the concave-convex fit structure axially extended.For example, the outer peripheral surface of rotating push-rod is formed with axially extending rib, the The inner peripheral surface of two ratchets is formed with the card slot axially extended, which is bonded in card slot, so that the second ratchet and rotation Push rod keeps rotating synchronously.

Yet another embodiment according to the present utility model, dosage adjust and show that knob and caudal peduncle connect one in cylinder With engaging groove, dosage adjust and display knob and caudal peduncle connect in cylinder another have be arranged in engaging groove radially Bump bonding.Bump bonding is arranged in engaging groove, so that caudal peduncle connects cylinder and dosage adjusts and show that knob keeps rotating synchronously.

The injection pen of the utility model is easy to operate, easy to use, limits frequency injection, reduces the wind of patient's infection Danger；Syringe needle is hidden in use process, eliminates patient to the fear of injection needle；Injection dosage precise control is, it can be achieved that repeatedly Calibrated shot, injection pen are combined into one with medical fluid, and medical fluid and injection needle are non-exchange, can be abandoned after use.

It is with reference to the accompanying drawing and specific real in order to more clearly illustrate the purpose of this utility model, technical solution and advantage Applying mode, the utility model is described in further detail.

Detailed description of the invention

Fig. 1 is the main view of the utility model injection pen preferred embodiment；

Fig. 2 is the axial sectional view of injection pen shown in Fig. 1；

Fig. 3 is the exploded view of injection pen shown in Fig. 1；

Fig. 4 is another exploded view of injection pen shown in Fig. 1；

Fig. 5 is the axial sectional view after injection pen shown in Fig. 1 decomposes；

Fig. 6 is the perspective view that caudal peduncle connects cylinder in injection pen shown in Fig. 1；

Fig. 7 is the perspective view that injection pen middle dosage shown in Fig. 1 adjusted and showed knob.

Specific embodiment

As shown in Fig. 1 to 7, as the injection pen of the preferred embodiment in the utility model, including by 3 institute of upper substrate 4 and form Upper shell, lower shell 5 and the pen cap 6 of composition.The upper end of lower shell 5 forms inclined-plane 58, has in the internal circumference on inclined-plane 58 One circle circular groove 59；Upper substrate 3 has the inclined-plane 60 cooperated with inclined-plane 58, there is circle circle muscle in the exterior circumference of 60 lower section of inclined-plane 61, circle muscle 61 is bonded in circular groove 59, removable connection and positioning in realization between substrate 4 and lower shell 5.Pen cap 6 it is upper End has inclined-plane 68, has circular bar 67 in the internal circumference on inclined-plane 68；Lower shell 5 has the inclined-plane cooperated with inclined-plane 68 70, there is annular groove 69 in the exterior circumference of the lower section of inclined-plane 70, muscle 67 is bonded in slot 69, is realized between lower shell 5 and pen cap 6 Removable connection and positioning.

Form 3 is arranged in upper substrate 4, and the inner peripheral surface of form 3 is formed with the first internal screw thread 39, the outer peripheral surface shape of form 3 At the guiding rib 41 for having convex block 40 He axially extending；The top of upper substrate 4 has the card hole 42 through its peripheral wall, inner circumferential top It is formed with the guide groove 43 axially extended and the first radial protrusion 401 positioned at 3 lower section of form.Convex block 40 is assemblied in base In the card hole 42 of material 4, guiding rib 41 is packed into the guide groove 43 of upper substrate 4, realizes that the positioning between form 3 and upper substrate 4 connects It connects.

Injection pen further includes that dosage adjusts and show knob 2, and the upper end stretches out in substrate 4, and lower end, which has, is located at first The annular bottom wall 201 of 40 top of radial protrusion, the inside of annular bottom wall 201 is formed with the first ratchet 32；Dosage adjusts and display The periphery of knob 2 is formed with the external screw thread 38 screwed with the first internal screw thread 39 and the graduation mark being spirally distributed (in figure not It shows).The circle number of first internal screw thread 39 can be set less, such as less than 2 circles or 1 circle, to reduce the first internal screw thread 39 Rotation friction between external screw thread 38.

Injection pen further includes the lining core 14 for being fixed in substrate 4 and being located at 401 lower section of the first radial protrusion, lining core There is buckle 77 on 14 excircle, buckle 77 is packed into the hole 79 on upper substrate 4, realizes fixation of the lining core 14 in upper substrate 4 Setting.

Injection pen further includes drug storage component, and drug storage component includes the pen core frame 16 being arranged in lower shell 5, is arranged in pen core Frame 16 is interior and pre-installs the clamped bottle 17 of medical fluid；There is notch 80, convex block 54 and the guiding rib 55 axially extended on pen core frame 16, The guide groove 57 that lining core 14 has card hole 56 and axially extends, convex block 54 are assemblied in the card hole 56 of lining core 14, guiding rib 55 Be packed into the guide groove 57 of lining core 14, the muscle 82 in notch 80 and lining core 14, which cooperates, to be limited, realize lining core 14 and pen core frame 16 it Between be located by connecting.

Also there is circumference baffle 81, the cooperation of step 83 limits in the hole on circumference baffle 81 and upper substrate 4 on pen core frame 16； The head 84 of pen core frame 16 and the clamped bottle 17 of prepackage medical fluid assemble, and realize pen core frame 16 and pre-install the positioning of medical fluid clamped bottle 17 Connection.

The needle assembly of injection pen includes injection needle 20, needle protective 21 and the conduct first being arranged in needle protective 21 The compressed spring 19 of resilient compressible member, compressed spring 19 is for realizing needle protective 21 in axially retracting and do not have by pressure Axial reset under stress；There is external screw thread 85, external screw thread 85 and injection needle 20 on the excircle on the head 84 of pen core frame 16 Internal screw thread 66 screws, and realizes being located by connecting for pen core frame 16 and injection needle 20.The both ends of compressed spring 19 respectively with needle protective 21 and washer 18 abut, washer 18 is fixed at the front end in lower shell 5 and around pen core frame 14.

18 periphery of washer has guiding rib 86 and convex block 62, and inner circumferential has inner hole 87 and step surface 88；Leading on washer 18 Cooperate to muscle 86 and the guide groove 65 of 5 inner circumferential of lower shell, is positioned convenient for the assembly of washer 18 and lower shell 5, it is convex on washer 18 Block 62 is packed into the card hole 63 on lower shell 5, and realization washer 18 is fixedly connected with lower shell 5.The inner hole 87 of washer 18 to By injection needle 20, the step surface 88 in washer 18 is to realize the limitation to 16 rigging position of pen core frame.

5 inner circumferential of lower shell is provided with axially extending guide and limit slot 91, is formed on needle protective 21 and slideably sets The second guide protrusions 64 in guide and limit slot 91 are set, so that needle protective 21 is telescopically disposed in the lower end of lower shell 5, Compressed spring 19 makes needle protective 21 stretch out and hide injection needle 20 under non-injection state.Needle protective 21 has for injection The hole 90 that needle 20 passes through under injection state, the front end of needle protective 21 are provided with flexible rubber ring 89, and flexible rubber ring 89 is set in On the hole wall in hole 90 and cover the front end face of needle protective 21.

Injection pen further includes connecting cylinder 8, the second spine by release button 1, screw rod 9, limit push rod 10, rotating push-rod 11, caudal peduncle The propulsive mechanism that wheel 12, clutch ratchet 13 and the compressed spring 7 as the second resilient compressible member are constituted, and screw rod 9, limit push away Bar 10, rotating push-rod 11, caudal peduncle connect cylinder 8 and dosage adjusts and display knob 2 is set gradually from inside to outside radially, compresses bullet The setting of spring 7 connects between cylinder 8 and release button 1 in caudal peduncle, i.e., its both ends connects cylinder 8 with caudal peduncle respectively and release button 1 abuts against.

There is axis of a cylinder 52 in the inside of release button 1, and periphery has annular groove 50, and dosage adjusts and the inner circumferential tool of display knob 2 There is the muscle 51 being arranged in annular groove 50, the width of annular groove 50 in the axial direction is greater than the width of muscle 51, so that annular release is pressed The top that dosage adjusts and shows knob 2 is axially displaceably arranged in button 1.

The upper end that caudal peduncle connects cylinder 8 forms the tubing string 49 with tubing string hole 53, and the axis of a cylinder 52 of release button 1 protrudes into tubing string hole 53 Interior, compressed spring 7 is set on axis of a cylinder 52 and tubing string 49.Dosage is adjusted and the inner circumferential of display knob 2 has bump bonding 45, tail The periphery that handle connects cylinder 8 has engaging groove 44, and bump bonding 45 is arranged in radially in engaging groove 44 so that caudal peduncle connect cylinder 8 with Dosage is adjusted and display knob 2 remains synchronous rotation.

Rotating push-rod 11 has the second radial protrusion positioned in the axial direction by the first radial protrusion 401 and lining core 14 74, the second ratchet 12 and clutch ratchet 13 are set on rotating push-rod 11, and the lower gap that the second ratchet 12 connects cylinder 8 with caudal peduncle is matched It closes, clutch ratchet 13 is presented axially between the first ratchet 32 and the second ratchet 12.

Clutch ratchet 13 is configured to rotate relative to rotating push-rod 11；The outer peripheral surface of rotating push-rod 11 is formed with axial prolong The rib 34 stretched, the inner peripheral surface of the second ratchet 12 are formed with the card slot 33 axially extended, and rib 34 is bonded in card slot 33, with So that the second ratchet 12 and rotating push-rod 11 keep rotating synchronously.

The lower end of second ratchet 12 is formed with the ratchet 36 of annular spread；The lower end of clutch ratchet 13 is formed with and the first spine The third ratchet 31 of 32 engagement of wheel, upper end is formed with the 4th ratchet 37 engaged with the second ratchet 12, the first ratchet 32 and third The transmission direction of ratchet is opposite with the transmission direction of the second ratchet 12 and the 4th ratchet.

The spine that the periphery of second radial protrusion 74 of rotating push-rod 11 has arc cantilever and is formed on the arc cantilever The upper end of tooth (not shown), 14 inner peripheral surface of lining core has ratchet 140.Second radial protrusion 74 is arranged in lining core 14, and It is positioned in the axial direction by the first radial protrusion 401 and lining core 14.Ratchet on ratchet 140 and arc cantilever constitutes so that rotation Push rod 11 makees the ratchet mechanism one-directionally rotated in injection process.

The inner circumferential that caudal peduncle connects cylinder 8 forms the guide groove 48 by axially extending, and the periphery of limit push rod 10 is formed with setting The first guide protrusions 47 in guide groove 48, so that limit push rod 10 connects the rotation of cylinder 8 with caudal peduncle and may be axially movable；Lining core Be provided with the second internal screw thread 78 in 14, limit push rod 10 has a hole 75, and the inner circumferential in hole 75 has a third internal screw thread 46, screw rod 9 with The third internal screw thread 46 in the second internal screw thread 78 and limit push rod 10 in lining core 14 screws.The circle number of third internal screw thread 46 can be with It is arranged less, such as less than 2 circles or 1 circle, to reduce the rotation friction between third internal screw thread 46 and screw rod 9.

The front end of screw rod 9 has plunger 15, and the crimp head 27 of 9 front end of screw rod and the hole 28 in plunger 15 are by squeezing assembly Together, the rotation of screw rod 9, which moves ahead, drives plunger 15 to move ahead and squeezes sealing piston 71 and move ahead.The end of screw rod 9 has and can move ahead Limit end 73 to limit push rod 10, limit end 73, which is proceeded to, to be contacted with third internal screw thread 46 and limits screw rod Maximum forward travel distance.

Axially cut-out screw thread forms two sections 72 parallel to each other to 9 liang of lateral edges of screw rod respectively, is formed on section 72 There is the second axially extending guide groove (not shown), the lower end in rotating push-rod 11, which is formed with, to be arranged in the second guide groove Third radial protrusion 110 so that screw rod one-directional rotation synchronous with rotating push-rod in injection process, and one-directionally rotated synchronous When push clamped bottle 17 sealing piston 71 make towards injection needle 20 forward travel；Push rod 10 is limited to be arranged in third radial convex Play 110 top.

The working principle of the utility model injection pen is as follows:

When dosage is adjusted, dose adjusts and display knob 2 (such as rotating clockwise), and dosage adjusts and display knob Required scale is moved on 2, caudal peduncle is adjusted with cylinder 8 and dosage and display knob 2 rotates together and in clutch ratchet 13 and the second spine It is moved up under the drive of wheel 12, jumps tooth space since clutch ratchet 13 and the second ratchet 12 exist at this time (compressed spring 7 at this time can be into The compression of one step), dosage is adjusted and display knob 2 is unable to drive rotating push-rod 11 and screw rod 9 rotates；At the same time, rotating push-rod Ratchet mechanism between 11 and lining core 14 prevents rotating push-rod 11 from rotating, and then screw rod 9 is prevented to rotate, and limits push rod 10 in caudal peduncle Even rotates and move up around screw rod 9 under the drive of cylinder 8.If dosage is adjusted excessively, it can be reversed dose and adjust and show rotation Button 2 (such as rotation counterclockwise) is displaced downwardly to required scale, and when reversely rotating dosage adjusting and display knob 2, screw rod 9 is same Sample can not rotate, and limit push rod 10 is then rotated and moved down.That is, can adjust and show the two-way of knob 2 by dosage Rotation is adjusted to correct and reach accurate dosage.Clutch ratchet 13 or the second ratchet 12 make to jump tooth movement when dosage is adjusted and It generates and jumps dental prompt.

When injection, pen cap 6 is removed, and the alignment of needle protective 21 injection site is subjected to pressing completion injection needle 20 and is penetrated, Then release button 1 is pressed, release button 1 squeezes caudal peduncle and connects cylinder 8 and dosage adjusting and display knob 2, and dosage adjusts and display The screw thread 38 of knob 2 squeezes the screw thread 39 in form 3, and screw thread 39 generates so that dosage adjusts and show that knob 2 rotates tangential Component, dosage is adjusted and the display rotation of knob 2 drives caudal peduncle to connect the rotation of cylinder 8, and caudal peduncle connects the rotation of cylinder 8 and limit push rod 10 is driven to rotate And it moves down；At the same time, there is no jump tooth space, dosage under the extruding that caudal peduncle connects cylinder 8 for clutch ratchet 13 and the second ratchet 12 It adjusts and the display rotation of knob 2 drives clutch ratchet 13, the second ratchet 12 and rotating push-rod 11 to rotate, rotating push-rod 11 rotates band The dynamic rotation of screw rod 9 moves ahead, and the forward sealing piston 71 squeezed in clamped bottle 17 of screw rod 9 moves ahead, and sealing piston 71, which moves ahead, to be squeezed in advance Medical fluid in clamped bottle 17 has the medical fluid of pressure to be injected in vivo by injection needle 20 and completes to inject.Due to limiting push rod 10 is identical with 9 angular speed of screw rod, and the distance that screw rod 9 advances is equal to the displacement that push rod 10 is limited when dosage is adjusted, so that injection It measures precisely controlled.

The frequency injection of the utility model injection pen can be set to repeatedly (depending on clamped bottle storage dosage and every time The injection dosage of injection), since rotating push-rod 11 can only make single direction rotation, so screw rod 9 also can only by unidirectional drive, that is, It travels forward, can not retreat, until the drug injection in clamped bottle 17 finishes or screw rod 9 proceeds in limit end 73 and third Screw thread 46 abuts.

In the utility model, unless otherwise instructed, in the axial direction close to one end where injection needle 20 be under, preceding, front end Or head, it is in the axial direction upper, rear, end or tail portion close to one end where release button 1.

Although depicting the utility model above by preferred embodiment, but it is to be understood that, ordinary skill Personnel are all according to improving on an equal basis made by the utility model in the invention scope for not departing from the utility model, should be practical Novel protection scope is covered.

Claims (11)

1. a kind of calibrated shot pen with hiding injection needle, characterized by comprising:

Pen container, including upper shell interconnected and lower shell, the inner circumferential of the upper shell are formed with the first internal screw thread and are located at The first radial protrusion below first internal screw thread；

Dosage adjusts and display knob, and periphery is formed with the graduation mark being spirally distributed and screws with first internal screw thread External screw thread；The dosage is adjusted and the upper end of display knob stretches out in the upper shell, and lower end has annular bottom wall and is located at The top of first radial protrusion is formed with the first ratchet on the inside of the annular bottom wall；

Lining core is fixed in the upper shell, and is located at the lower section of first radial protrusion；It is provided in the lining core Second internal screw thread；

Drug storage component, including the pen core frame being arranged in the lower shell and the clamped bottle being arranged in the pen core frame；

Needle assembly, including injection needle, needle protective and the first resilient compressible member being arranged in the needle protective；It is described Injection needle is connect with the lower end of the pen core frame, and the needle protective is telescopically disposed in the lower end of the lower shell, described First resilient compressible member is configured to that the needle protective is made to stretch out and hide the injection needle under non-injection state, described Needle protective has the hole passed through under injection state for the injection needle；

Propulsive mechanism, including release button, screw rod, limit push rod, rotating push-rod, caudal peduncle connect cylinder, the second ratchet, clutch ratchet and Second resilient compressible member, the screw rod, the limit push rod, the rotating push-rod, the caudal peduncle connect cylinder and the dosage tune Section and display knob are set gradually from inside to outside radially, and the dosage tune is axially displaceably arranged in the release button The top of section and display knob, the first resilient compressible member setting connect between cylinder and the release button in the caudal peduncle, The rotating push-rod has the second radial protrusion positioned in the axial direction by first radial protrusion and the lining core, described Second ratchet and the clutch ratchet are set on the rotating push-rod, and second ratchet and the caudal peduncle connect between the lower end of cylinder Gap cooperation, the clutch ratchet are presented axially between first ratchet and second ratchet；

Wherein, second ratchet arrangement is to keep rotating synchronously with the rotating push-rod, and the clutch ratchet is then configured to can It is rotated relative to the rotating push-rod；The lower end of the clutch ratchet is formed with the third ratchet engaged with first ratchet, Upper end is formed with the 4th ratchet engaged with second ratchet, the transmission direction of first ratchet and the third ratchet with The transmission direction of second ratchet and the 4th ratchet is opposite；

It is formed between the rotating push-rod and the lining core so that the rotating push-rod was made to one-directionally rotate in injection process Ratchet mechanism, the screw arrangement are one-directional rotation synchronous with the rotating push-rod and push the card in synchronous one-directional rotation The sealing piston of formula bottle makees the forward travel towards the injection needle；

The caudal peduncle connects cylinder and is configured to adjust and show that knob is rotated synchronously with the dosage, and the caudal peduncle connects the inner circumferential shape of cylinder At the guide groove by axially extending, it is convex that the periphery of the limit push rod is formed with the first guiding being arranged in the guide groove It rises, the inner circumferential of the limit push rod has third internal screw thread, the screw rod and second internal screw thread and the third internal screw thread It screws.

2. as described in claim 1 with the calibrated shot pen for hiding injection needle, it is characterised in that: the needle protective Front end is provided with flexible rubber ring.

3. as described in claim 1 with the calibrated shot pen for hiding injection needle, it is characterised in that: solid in the lower shell Surely be provided with the washer around pen core frame front end, first resilient compressible member be both ends respectively with the needle protective The compressed spring abutted with the washer.

4. as described in claim 1 with the calibrated shot pen for hiding injection needle, it is characterised in that: set in the lower shell It is equipped with the guide and limit slot axially extended, is formed with and is slidably disposed in the guide and limit slot on the needle protective The second guide protrusions.

5. as described in claim 1 with the calibrated shot pen for hiding injection needle, it is characterised in that: the upper shell includes Upper substrate and the form being arranged in the upper substrate, first internal screw thread are formed in the inner peripheral surface of the form；On described The top of substrate has the card hole through its peripheral wall, and the form periphery has the convex block being packed into the card hole.

6. as described in claim 1 with the calibrated shot pen for hiding injection needle, it is characterised in that: two lateral edge of screw rod Axial cut-out screw thread respectively forms two sections parallel to each other, and the second axially extending guiding is formed on the section Slot, the lower end in the rotating push-rod are formed with the third radial protrusion being arranged in second guide groove；The limit pushes away The top of the third radial protrusion is arranged in bar.

7. as described in claim 1 with the calibrated shot pen for hiding injection needle, it is characterised in that: the caudal peduncle connects cylinder Upper end forms the tubing string with tubing string hole, has the axis of a cylinder protruded into the tubing string hole, second bullet in the release button Property compression member is the compressed spring being set on the axis of a cylinder and the tubing string.

8. as described in claim 1 with the calibrated shot pen for hiding injection needle, it is characterised in that: the ratchet mechanism packet The spine for including the ratchet for being formed in lining core inner peripheral surface upper end and being formed on the arc cantilever of second radial protrusion periphery Tooth.

9. as described in claim 1 with the calibrated shot pen for hiding injection needle, it is characterised in that: the end of the screw rod Institute is limited with the limit end limited in push rod, the limit end and the third screw-internal thread fit can be proceeded to State the maximum forward travel distance of screw rod；The front end of the screw rod has the plunger for pushing sealing piston in the clamped bottle.

10. as described in claim 1 with the calibrated shot pen for hiding injection needle, it is characterised in that: the rotating push-rod Outer peripheral surface and the inner peripheral surface of second ratchet be formed with the concave-convex fit structure axially extended.

11. as described in claim 1 with the calibrated shot pen for hiding injection needle, it is characterised in that: the dosage is adjusted And showing that knob and the caudal peduncle connect one in cylinder and have engaging groove, the dosage adjusts and shows that knob and the caudal peduncle connect Another in cylinder has the bump bonding being arranged in the engaging groove radially.