Invention content
The purpose of the present invention is to provide a kind of injection pen, with alleviate injection pen in the related technology be difficult to differentiate whether byThe technical issues of use.
Injection pen provided by the invention includes：Inject pen tube, hidden needle protection mechanism and injection mechanism, the injection mechanism packetNeedle tubing and syringe needle are included, the needle tubing is set in the injection pen tube, and the syringe needle is installed on one end of the needle tubing, and is located at instituteIt states outside injection pen tube；
The hidden needle protection mechanism includes hidden needle elastic parts, hidden needle guard and retaining claw, and the hidden needle guard is sheathed on instituteSyringe needle is stated, the first end of the hidden needle guard is located at outside the injection pen tube, and the second end of the hidden needle guard is located at the injection penIt is connect in pipe and with the hidden needle elastic parts；The retaining claw blocks and sets between the syringe needle and the hidden needle guardIn one end of the installation syringe needle of the needle tubing；
The hidden needle guard is equipped with the embedding hole coordinated with the retaining claw, and the side wall of the hidden needle guard is run through in the embedding hole,The retaining claw is between the needle tubing and the embedding hole, and the relatively described syringe needle of second end of the hidden needle guard is to the noteWhen penetrating movement in pen tube, the hidden needle elastic parts compression, the retaining claw is caught in the embedding hole, the hidden needle bullet of compressionProperty component for making the hidden needle guard that the retaining claw be driven to be moved to injection pen tube outward transport.
Further, the hidden needle elastic parts includes hidden needle spring and hidden needle spring set, is equipped in the injection pen tubeFirst catch, the hidden needle spring set have the first guide pin, and first guide pin passes through first catch, and with it is describedFirst catch is slidably matched, and the hidden needle guard is connected with the hidden needle spring set；
The hidden needle spring is between first catch and the hidden needle guard, and the hidden needle spring is respectively with describedOne catch and the hidden needle spring set connection.
Further, the hidden needle guard is connected by the second guide pin and the hidden needle spring set, in the injection pen tubeIt is additionally provided with the second catch, second catch is located between the hidden needle spring set and the hidden needle guard, second guide pinIt is slidably matched across second catch, and with second catch.
Further, the outer wall fixing sleeve of the hidden needle spring set is equipped with baffle ring, the baffle ring respectively with the hidden needle bulletSpring is connected with second guide pin.
Further, the retaining claw includes snap ring and multiple pawls, the multiple circumferential directions of the pawl along the snap ringIt is spaced apart, and is fixedly connected with the snap ring；
The quantity in the embedding hole is equal with the quantity of pawl, and coordinates with multiple one-to-one correspondence of falling pawl.
Further, the injection mechanism further includes injection spring, and the needle tubing includes liquid storage tube and push rod, describedOne end of push rod is located in the liquid storage tube, the other end runs through first catch, and matches with first catch slidingIt closes；One end of the injection spring is connect with the push rod, the other end is connect with first catch；
First catch is equipped with pre- locking assembly away from the side of the injection spring, and the pre- locking assembly is used forIt locks or discharges the push rod, when locking the push rod, the injection spring makes the push rod have to close to the syringe needle sideTo the trend of movement.
Further, the pre- locking assembly includes pre- locking lid and positive stop bead, and the pre- locking lid is covered on the notePenetrate one end far from the hidden needle guard of pen tube；
The pre- locking lid has the cylindrical groove coordinated with the push rod, and the push rod can the into and out cylindricalityThe circumferential wall of slot, the push rod and cylindrical groove cooperation is equipped with the first limit hole, and the side wall of the cylindrical groove is equipped with the second limitPosition hole, second limit hole run through the side wall of the cylindrical groove, and the outer wall of first guide pin and the cylindrical groove slidesCooperation, first guide pin are equipped with third limit hole；
When the injection pen is not used, the positive stop bead is located at first limit hole and second limit hole, so thatThe injection spring is in compressive state, and the hidden needle guard pushes the hidden needle spring set movement, the third limit hole and instituteState the second limit hole it is opposite when, the positive stop bead enter second limit hole and the third limit hole, to be pushed away described in releaseBar.
Further, the injection spring is sheathed on the push rod.
Further, the push rod is hollow structure, and the injection spring is set in the push rod.
Further, the hidden needle spring set is hollow structure, and the push rod runs through the hidden needle spring set.
For injection pen provided by the invention by before use, retaining claw is located in injection pen tube, hidden needle guard is sheathed on syringe needleOutside reduces syringe needle and is damaged；Injection pen is directed at injection site when use, hidden needle guard, hidden needle are pressed by injection siteIt covers and is moved to the inside of injection pen tube, elastic parts is compressed, and syringe needle piercing is injected position, while retaining claw falls into embedding holeAnd elastic force is generated outward, it is then injected, in injection process, retaining claw is located in embedding hole, prevents hidden needle guard with respect to needle tubingIt is moved with syringe needle, improves stability when injection, reduction causes unnecessary injury to user, extracted rapidly after injectionSyringe needle is injected position and disappears to the active force of hidden needle guard, and under the action of elastic parts restoring force, hidden needle guard drives locking cardPawl is to the external movement of injection pen tube, and hidden needle guard is sheathed on outside syringe needle again, also, retaining claw passes through embedding hole and injection penThe end face of pipe contacts, and hidden needle guard is prevented to be again introduced into injection pen tube and keep syringe needle exposed, also, can by retaining claw whether withThe end face contact for injecting pen tube, judges whether injection pen has been used.
Specific implementation mode
Technical scheme of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementationExample is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skillThe every other embodiment that personnel are obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", "vertical",The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely toConvenient for the description present invention and simplify description, do not indicate or imply the indicated device or element must have a particular orientation,With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.In addition, term " first ", " second "," third " is used for description purposes only, and is not understood to indicate or imply relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phaseEven ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It canCan also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke YishiConnection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete conditionConcrete meaning in invention.
As shown in Figure 1 to Figure 3, injection pen provided in an embodiment of the present invention includes：Inject pen tube 100, hidden needle protection mechanismAnd injection mechanism, injection mechanism include needle tubing and syringe needle 320, needle tubing is set in injection pen tube 100, and syringe needle 320 is installed on needle tubingOne end, and positioned at injection pen tube 100 outside；Hidden needle protection mechanism includes hidden needle elastic parts, hidden needle guard 220 and retaining claw230, hidden needle guard 220 is sheathed on syringe needle 320, and the first end of hidden needle guard 220 is located at outside injection pen tube 100, and the second of hidden needle guard 220End is located in injection pen tube 100 and is connect with hidden needle elastic parts；Retaining claw 230 be located at syringe needle 320 and hidden needle guard 220 itBetween, and it is arranged in one end of the installation syringe needle 320 of needle tubing；Hidden needle guard 220 is equipped with the embedding hole 221 coordinated with retaining claw 230, embeddingThe side wall of hidden needle guard 220 is run through in hole 221, and retaining claw 230 is between needle tubing and embedding hole 221, the second end phase of hidden needle guard 220When being moved into injection pen tube 100 to syringe needle 320, hidden needle elastic parts compression, retaining claw 230 is caught in embedding hole 221, compressionHidden needle elastic parts is for making hidden needle guard 220 that retaining claw 230 be driven to be moved to outside injection pen tube 100.
Specifically, injection pen tube 100 includes the first pen tube and the second pen tube, hidden needle elastic parts is set in the first pen tube,Needle tubing, hidden needle guard 220 and retaining claw 230 are set to the second pen tube, and the first pen tube is connect with the second pen tube by way of clamping,And it is interconnected.
Further, hidden needle elastic parts includes hidden needle spring 211 and hidden needle spring set 212, injects and is equipped in pen tube 100First catch 110, hidden needle spring set 212 have the first guide pin 213, and the first guide pin 213 passes through the first catch 110, and withFirst catch 110 is slidably matched, and hidden needle guard 220 is connect with hidden needle spring set 212；Hidden needle spring 211 be located at the first catch 110 withBetween hidden needle guard 220, hidden needle spring 211 is connect with the first catch 110 and hidden needle spring set 212 respectively.
As shown in Figure 1 to Figure 3, the first catch 110 is fixedly connected on the end far from hidden needle guard 220 in injection pen tube 100,The end face opposite with the first catch 110 of hidden needle spring set 212 is equipped with the first guide pin 213, as shown in figure 4, hidden needle spring setIt is set on 212 there are two the first guide pin 213, the section of two the first guide pins 213 is oppositely arranged, and section is in circular ring shape；TheIt is set on one catch 110 there are two arc-shaped through-hole, two the first guide pins 213 pass through two arc-shaped through-holes correspondingly, andIt is slidably matched with the first catch 110.Hidden needle spring 211 is sheathed on the outside of hidden needle spring set 212, the upper end of hidden needle spring 211It is contacted with the first catch 110, lower end is connect with hidden needle spring set 212, and the lower end of hidden needle spring set 212 is connect with hidden needle guard 220.When hidden needle guard 220 is moved into injection pen tube 100, hidden needle guard 220 pushes hidden needle spring set 212 to move upwards, hidden needle spring 211It is compressed, after being injected position to the active force disappearance of hidden needle guard 220, under the action of hidden 211 restoring force of needle spring, makes hidden needleSet 220 drives retaining claw 230 to injection 100 external movement of pen tube.The above-mentioned setting of hidden needle elastic parts makes hidden needle guard 220 existAfter the completion of injection automatic traction retaining claw 230 to injection 100 external movement of pen tube, meanwhile, hidden needle spring 211 be set to hidden needle bulletThe stabilization when compression of hidden needle spring 211 and elongation is improved the outside of spring set 212 to the guiding role that hidden needle spring 211 playsProperty.
Further, hidden needle guard 220 is connect by the second guide pin 222 with hidden needle spring set 212, is injected in pen tube 100It is additionally provided with the second catch 120, the second catch 120 is located between hidden needle spring set 212 and hidden needle guard 220, and the second guide pin 222 is wornThe second catch 120 is crossed, and is slidably matched with the second catch 120.
Specifically, the second catch 120 is set between hidden needle spring set 212 and hidden needle guard 220, hidden needle guard 220 and second gearThe opposite end face of piece 120 is equipped with the second guide pin 222, as shown in figure 5, being set on hidden needle guard 220, there are two the second guide pins222, two the second guide pins 222 are oppositely arranged, and section is arc-shaped, and are set on the second catch 120 there are two arc-shaped through-hole, twoSecond guide pin 222 passes through two arc-shaped through-holes correspondingly, and is slidably matched with the second catch 120, two second guidingThe upper end of piece 222 is connect with hidden needle spring set 212；The upper end of hidden needle guard 220 is sheathed on the lower end of needle tubing, hidden needle guard 220Outer wall is contacted with the inner wall of injection pen tube 100, and needle tubing plays guiding role with the injection cooperation of pen tube 100 to hidden needle guard 220.Hidden needleSet 220 is connect by the second guide pin 222 with hidden needle spring set 212, while realizing that power transmits, reduces the space occupied.
Further, the outer wall fixing sleeve of hidden needle spring set 212 is equipped with baffle ring 214, baffle ring 214 respectively with hidden needle spring211 and second guide pin 222 connect.
As shown in figure 4,214 fixing sleeve of baffle ring is set to the lower end of hidden needle spring set 212, baffle ring 214 is led positioned at two secondTo between piece 222, on two the second guide pins 222 end face opposite with baffle ring 214, it is equipped with the groove coordinated with baffle ring 214, gearRing 214 is connected in groove, realizes the connection of the second guide pin 222 and baffle ring 214.Hidden needle spring 211 is sheathed on hidden needle springThe outside of set 212, the upper surface of hidden needle spring 211 are contacted with the first catch 110, lower face and the baffle ring 214 of hidden needle spring 211End face contact, baffle ring 214 and the first catch 110 coordinate plays position-limiting action to hidden needle spring 211.
Further, retaining claw 230 includes snap ring 231 and multiple pawls 232, multiple weeks of the pawl 232 along snap ring 231To being spaced apart, and it is fixedly connected with snap ring 231；The quantity in embedding hole 221 is equal with the quantity of pawl 232, and with it is multiple fallPawl 232 corresponds cooperation.
In some embodiments, the quantity of pawl 232 can be three, four or five etc., in the present embodiment, pawl 232Quantity be four, as shown in fig. 6, four fall pawl 232 be uniformly distributed along the circumferential direction of snap ring 231, and with snap ring 231 fix connectIt connects；Snap ring 231 is sheathed on the position of the installation syringe needle 320 of needle tubing, and the internal diameter of snap ring 231 is less than the diameter of needle tubing, prevents cardRing 231 moves up；The end face opposite with hidden needle guard 220 of pawl 232 is equipped with clamping protrusion, and clamping protrusion, which is equipped with, to be tiltedFace, to facilitate clamping to protrude out into embedding hole 221.Pawl 232 is made of elastic material, such as：Rubber and PVC etc.；Hidden needle guard 220Inner wall be equipped with the guide groove equal with 232 quantity of pawl, the extending direction phase of the extending direction of guide groove and hidden needle guard 220Together, four are fallen pawl 232 and are snug fit at correspondingly in four guide grooves, are all provided in each guide groove there are one embedding hole 221,Multiple embedding holes 221 are located at the same sectional position of hidden needle guard 220.When injection pen is not used, clamping protrusion is located at the upper of embedding hole 221Square, pawl 232 is in compressive state, and hidden needle guard 220 is moved into injection pen tube 100, and multiple pawls 232 are to hidden needle guard 220Guiding role is played in movement, the stability of the movement of hidden needle guard 220 is improved, when clamping protrusion is opposite with embedding hole 221, in restoring forceUnder effect, clamping protrudes out into embedding hole 221, and under the action of injecting 100 inner wall of pen tube, clamping protrusion is limited in embedding hole 221Interior, pawl 232 prevents hidden needle guard 220 from further being transported into injection pen tube 100 still in compressive state, multiple pawl 232 cooperationsDynamic, control syringe needle 320 exposes the length of hidden needle guard 220, to control injection depth；Hidden needle guard 220 drive retaining claw 230 to100 external movement of pen tube is injected, when embedding hole 221 moves to injection 100 outside of pen tube, under the action of restoring force, clamping protrusionEmbedding hole 221 is stretched out, and is contacted with the end face of injection pen tube 100, prevents hidden needle guard 220 from retracting.
Further, injection mechanism further includes injection spring 330, and needle tubing includes liquid storage tube 311 and push rod 312, is pushed awayOne end of bar 312 is located in liquid storage tube 311, the other end runs through the first catch 110, and is slidably matched with the first catch 110；One end of injection spring 330 is connect with push rod 312, the other end is connect with the first catch 110；First catch 110 deviates from injectionThe side of spring 330 is equipped with pre- locking assembly, and pre- locking assembly is for locking or discharging push rod 312, when locking push rod 312, noteProjectile spring 330 makes push rod 312 have to the trend moved close to 320 direction of syringe needle.
Liquid storage tube 311 may be configured as different diameters, and to meet different injection needs, push rod 312 is located at medicineOne end in liquid storage tube 311 is equipped with rubber stopper, and push rod 312 pushes liquid by rubber stopper.When injection, be injected position make it is hiddenNeedle guard 220 to injection pen tube 100 in move, syringe needle 320 and be injected location contacts and be pierced into be injected position, pre- locking assemblyPush rod 312 is discharged, under the action of 330 restoring force of injection spring, liquid is pushed to by syringe needle 320 and is injected by push rod 312Position.
Further, pre- locking assembly includes pre- locking lid 341 and positive stop bead 342, and pre- locking lid 341 is covered on injection penOne end far from hidden needle guard 220 of pipe 100；There is pre- locking lid 341 cylindrical groove coordinated with push rod 312, push rod 312 can enterWith removal cylindrical groove, the circumferential wall of push rod 312 and cylindrical groove cooperation is equipped with the first limit hole, and the side wall of cylindrical groove is equipped with second and limitsPosition hole, the second limit hole run through the side wall of cylindrical groove, and the outer wall of the first guide pin 213 and cylindrical groove is slidably matched, and first is oriented toPiece 213 is equipped with third limit hole 215；When injection pen is not used, positive stop bead 342 is located at the first limit hole and the second limit hole, withInjection spring 330 is set to be in compressive state, hidden needle guard 220 pushes hidden 212 movement of needle spring set, third limit hole 215 and secondWhen limit hole is opposite, positive stop bead 342 enters the second limit hole and third limit hole 215, to discharge push rod 312.
As shown in Figure 1 to Figure 3, the first limit hole there are two being set on push rod 312, the line at the center of two the first limit holesIt is identical as the radial line direction of push rod 312, it is set on the side wall of cylindrical groove there are two the second limit hole, the axis of two the second limit holesIt overlaps, and parallel with the line at the center of two the first limit holes；The close hidden needle spring of two the first guide pins 213 covers 212End be all provided with there are one third limit hole 215, the axis of two third limit holes 215 overlaps, and with the axis of the second limit holeLine is parallel.As shown in Figure 1, third limit hole 215 is located at the lower section of the second limit hole, two first guiding before injection pen useThe part that third limit hole 215 is not arranged for piece 213 is opposite with the second limit hole, prevents positive stop bead 342 from being moved from the second limit holeGo out, positive stop bead 342 is located in the first limit hole and the second limit hole, and limitation push rod 312 moves downward, to make injection spring330 are in compressive state.
When using injection pen, being injected position makes hidden needle guard 220 be moved into injection pen tube 100, while syringe needle 320 is pierced intoIt is injected position, hidden needle guard 220 pushes hidden needle spring set 212 and the first guide pin 213 to be transported to close to the direction of pre- locking lid 341Dynamic, pawl 232 enters embedding hole 221, and hidden needle spring 211 is compressed, as shown in Fig. 2, third limit hole 215 and the second limit hole phaseClock synchronization, under the action of the first limit hole side wall, positive stop bead 342 enters the second limit hole and third limit hole 215, automatic to dischargePush rod 312, under the action of 330 restoring force of injection spring, liquid is pushed to by syringe needle 320 and is injected position by push rod 312,After the completion of injection, injection pen is removed from position is injected, in the effect of hidden 211 restoring force of needle spring, 220 automatic band of hidden needle guardDynamic retaining claw 230 is moved to outside injection pen tube 100, when embedding hole 221 moves to injection 100 outside of pen tube, in the work of restoring forceUnder, it is clamped protrusion and stretches out embedding hole 221, and contacted with the end face of injection pen tube 100, prevent hidden needle guard 220 from retracting, and can basisWhether clamping protrusion contacts with the end face of injection pen tube 100, judges whether injection pen has been used.
Hidden needle protection mechanism coordinates with injection structure, and user need to only make hidden needle guard 220 and be injected location contacts, and pressPress injection pen, in injection pen a series of actions of each component complete automatic injection, and injection pen be injected after position detaches,Hidden needle guard 220 drives retaining claw 230 to be moved from outside trend injection pen pipe 100, and hidden needle guard 220 is sheathed on again outside syringe needle 320Portion, also, retaining claw 230 passes through embedding hole 221 to be contacted with the end face for injecting pen tube 100, and hidden needle guard 220 is prevented to be again introduced into notePenetrate pen tube 100 and keep syringe needle 320 exposed, also, can by retaining claw 230 whether with injection pen tube 100 end face contact, sentenceWhether disconnected injection pen has been used.
In some embodiments, injection spring 330 is sheathed on push rod 312.As shown in Figure 1 to Figure 3,312 periphery of push rodLower end be equipped with annular protrusion, the lower end of injection spring 330 contacts with annular protrusion, and upper end is contacted with the first catch 110, firstCatch 110 and annular protrusion cooperation limit hidden needle spring 211.
In other embodiments, push rod 312 is hollow structure, and injection spring 330 is set in push rod 312.Specifically, pushing awayBar 312 is equipped with cylinder chamber, and lower end closed, injection spring 330 are located in cylinder chamber, and lower end is contacted with the bottom wall of cylinder chamber, columnThe side wall of shape chamber is equipped with limiting slot, and limiting slot runs through the side wall of cylinder chamber, and the length direction phase of length direction and push rod 312Together, the first catch 110 is equipped with limit protrusion, and limit protrusion passes through the upper-end contact of limiting slot and injection spring 330, limit convexIt rises and injection spring 330 is limited with the cooperation of the bottom wall of cylinder chamber.
Further, hidden needle spring set 212 is hollow structure, and push rod 312 covers 212 through hidden needle spring.
As depicted in figs. 1 and 2, push rod 312 and injection spring 330 are by the inside of hidden needle spring set 212, injection spring330 are sheathed on push rod 312, and the upper end of injection spring 330 is contacted with the first catch 110, lower end and are set to 312 lower end of push rodAnnular protrusion contact, when the upper end of push rod 312 is limited in pre- locking lid 341, injection spring 330 is in compressive state.Push rod 312 and injection spring 330 are set in hidden needle spring set 212, reduce occupied space, to reduce the volume of injection pen.
Injection pen provided in an embodiment of the present invention is by before use, retaining claw 230 is located in injection pen tube 100, hidden needle guard220 are sheathed on the outside of syringe needle 320, reduce syringe needle 320 and are damaged；Injection pen is directed at injection site when use, passes through noteIt penetrates position and presses hidden needle guard 220, hidden needle guard 220 is moved to the inside of injection pen tube 100, and elastic parts is compressed, and syringe needle 320 piercesEnter and be injected position, while retaining claw 230 falls into embedding hole 221 and generates elastic force outward, is then injected, injection processIn, retaining claw 230 is located in embedding hole 221, prevents hidden needle guard 220 from being moved relative to needle tubing and syringe needle 320, improves steady when injectingQualitative, reduction causes unnecessary injury to user, extracts syringe needle 320 after injection rapidly, is injected position to hidden needleThe active force of set 220 disappears, and under the action of elastic parts restoring force, hidden needle guard 220 drives retaining claw 230 to injection pen tube100 external movement, hidden needle guard 220 are sheathed on again outside syringe needle 320, also, retaining claw 230 passes through embedding hole 221 and noteThe end face contact for penetrating pen tube 100, prevents hidden needle guard 220 to be again introduced into injection pen tube 100 and keep syringe needle 320 exposed, also, can lead toIt crosses whether retaining claw 230 contacts with the end face of injection pen tube 100, judges whether injection pen has been used.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extentPresent invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according toSo can with technical scheme described in the above embodiments is modified, either to which part or all technical features intoRow equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solutionThe range of scheme.