CN204798512U - Pin type safety syringe is unloaded in propulsion - Google Patents

Abstract

The utility model provides a pin type safety syringe is unloaded in propulsion, includes: a cylinder, but a reciprocating motion's push rod has in this cylinder, a joint seat is assembled through a connected structure to the front end inner wall of this cylinder, and this joint seat cover connects a syringe needle. This connected structure agrees with with the taper outer wall of a taper inner wall and this joint seat, and this connected structure constitutes limiting displacement with a protrusion in the spacing annular of the spacing bulge loop of this cylinder inner wall and this joint seat, and the gomphosis ring gomphosis that this connected structure supplied this joint seat with a gomphosis groove wherein is positioned this joint seat for this connected structure in view of the above. During displacement to the gomphosis that contacts this joint seat ring, executing a thrust again can push away this joint seat forward from this connected structure and cylinder together with the syringe needle on it this push rod in the lump forward to reach needle body and cylinder separation after using, avoid being stabbed by the needle body after using with the protection medical personnel and prick.

Description

Needle-safety syringe is unloaded in propelling

Technical field

The safty pin of this utility model and medication injections has pass, in more detail, is a kind of safe needle set that syringe needle can be unloaded from the front end of syringe after a procedure.

Background technology

Based on the danger that protection medical personnel avoid the syringe needle stamp of used syringe cylinder to prick, syringe cylinder provide protector be necessary.Typical protector, disclosed by american documentation literature US8608694, is pulled back by syringe needle to be recessed in syringe, is referred to as haulback type safe injection needle.

Above-mentioned haulback type safe injection needle, steadiness when needing special consideration combination and the pulling back property after using is combined with syringe at the needle stand of entry needle, and needle stand and syringe combine after air tightness need very high standard, can not have in Air infitration syringe, in order to avoid air is injected in human body cause thrombotic risk.But in configuration aspects, the steadiness combined if only consider and air-tightness, then easily cause the problem that needle stand is pulled back not easily.If consider for main easily to retract needle stand, then may weaken linking steady character and the air-tightness of needle stand and syringe.Retract easiness, steadiness and bubble-tight problem for will solve simultaneously, syringe, needle stand, push rod all must redesign, and structure will trend towards complicated, to such an extent as to manufacturing cost and difficulty increase, and are even difficult to realize.

Traditional haulback type safe injection needle mainly establishes a coupler body given prominence to chimeric with needle stand by the push rod front end in syringe, and pulls back needle stand in syringe.But during actual use, shift onto will close on syringe front end when push rod, namely when the ora terminalis of coupler body contacts with needle stand bottom, coupler body front end first will close the injecting liquid drug passage of needle stand inside, and make to be formed between syringe front end and coupler body an enclosed space, dead space capacity in this space cannot advance via injection canal, forms residual medicine in syringe.But not only medicine high price is expensive for some special medicinal liquid, and must inject enough dosage, namely residual medicine may cause the problem of injected dose deficiency, does not allow generation in fact.To solve the problem of above-mentioned residual medicine, imposing the thrust that push rod is larger exactly, breaking through the resistance of enclosed space, forcing the coupler body of push rod chimeric with needle stand.But syringe and syringe needle vibrations can be caused when large thrust and breakthrough enclosed space resistance, aggravation patient injection site pain, even blood vessel exposed by syringe needle.

Actual another problem used occurs in when drawing medicinal liquid with above-mentioned haulback type safe injection needle in medicine bottle.Before drawing medicinal liquid, medical personnel must perform and shift push rod onto syringe foremost by the action that the air in syringe is discharged completely, and afterwards, protruded into by syringe needle in medicine bottle, push rod of pulling back, is drawn into medicinal liquid in syringe.But push rod is shifted onto syringe action foremost, easily cause the mistake of coupler body and needle stand to combine, thus the misoperation that generation syringe needle retracts when push rod of pulling back extracts medicinal liquid.

Again, above-mentioned haulback type safe injection needle, the action of pulling back must with two hand operateds, and grip syringe on the other hand, one pushes back pulling-pushing rod.But during actual use, syringe is detached patient with a hands by medical personnel usually, and another hands stops blooding with the injection site of alcohol swab pressing patient immediately, now, medical personnel cannot perform the action of pulling back with two handss in fact, therefore create the syringe needle exposed empty window phase.

Utility model content

The purpose of this utility model is to provide a kind of propelling and unloads needle-safety syringe, the front end of syringe needle from syringe can be unloaded after using.

For achieving the above object, this utility model takes following technical scheme:

This utility model advances and unloads needle-safety syringe, comprising: a syringe, has a push rod that can move back and forth along the inwall of this syringe in this syringe; The front inner wall of this syringe assembles a joining base by a connected structure, and this joining base is socketed a syringe needle.This connected structure agrees with the taper outer wall of a taper inwall and this joining base, this connected structure is formed position-limiting action with the limited ring groove of the position limiting convex ring and this joining base protruding from this syringe inwall, this connected structure is chimeric wherein for the chimeric ring of this joining base with an embeded slot, is positioned in this connected structure by this joining base accordingly.Medicinal liquid in one medicine bottle can sink in this syringe by this syringe needle and this joining base by the backward displacement of this push rod in this syringe; Medicinal liquid can be exported by this joining base and this syringe needle by the anterior displacement of this push rod in this syringe.This push rod anterior displacement is to when contacting the chimeric ring of this joining base; execute one again and this joining base can be moved forward this connected structure of disengaging and syringe in the lump together with the syringe needle on it compared with high thrust; thus reach the needle body after using is separated with syringe, avoid to protect medical personnel being pricked by the needle body stamp after using.

Anchor ring after anchor ring, a middle anchor ring and before described position limiting convex ring comprises one; Described middle anchor ring is connected between described front anchor ring and described rear anchor ring; This front anchor ring formed in convergent footpath backward from the rear end of described taper inwall; This middle anchor ring continues at the most minor diameter part of this front anchor ring, and this rear anchor ring is an anchor ring perpendicular to described syringe inwall; This position limiting convex ring is positioned at the limited ring groove of described joining base with this front anchor ring and this middle anchor ring, the nose circle perimembranous of chimeric ring described in the rear annular face contacts of this position limiting convex ring block.

The junction of described rear anchor ring and described middle anchor ring is a chamfering.

The rear end face of described chimeric ring is a plane.

The circumference of described chimeric ring establishes an aerofluxus annular groove.

The beneficial effects of the utility model are: concrete effect of the present utility model:

This utility model provides a kind of propelling and unloads needle-safety syringe, and the mode pushed by push rod unloads pin from the front end of syringe.The mode of unloading pin is different from traditional pulling type syringe completely.This utility model propelling is unloaded needle-safety syringe and is unloaded pin action with one hand execution.This utility model unloads pin from the front end of syringe, allows the syringe needle after using be separated with syringe, reaches the object separately reclaimed.Joining base of the present utility model and connected structure have assemble stable, air-tightness and unload pin convenience.Syringe of the present utility model makes the push rod in syringe can move back and forth freely in syringe, be free to perform empty needle cylinder aerofluxus and draw the action of taking out medicinal liquid from medicine bottle, joining base and syringe needle can not be affected, completely avoid the problem of the misoperation that syringe needle is pulled back by pulling type syringe.When injection pushes away medicine, joining base of the present utility model coordinates with push rod, reduces and pushes away medicine resistance.Medicine is pushed away at the end, without liquor residue between joining base of the present utility model and push rod in injection.This joining base is the inside, front end being bonded on syringe, without any convex dew, medical personnel therefore can not be hindered to use syringe.Compared to traditional pulling type syringe, joining base of the present utility model is relative with the structural design of syringe simplifies, and does not need to change the push rod of syringe and needle head structure, remains the suitability of existing push rod and syringe needle, reduce develop, transform into, manufacturing cost.

Accompanying drawing explanation

Fig. 1 is three-dimensional exploded view of the present utility model.

Fig. 2 is the sectional exploded view of syringe front end of the present utility model, joining base, syringe needle.

Fig. 3 is the combination section of syringe front end of the present utility model, joining base, syringe needle.

Fig. 4 is the combination section of this utility model safety injector.

Fig. 5 is the combination section of this utility model safety injector.

Fig. 6 is the section action schematic diagram that this utility model safety injector unloads pin.

Drawing reference numeral: 10: syringe; 30: joining base; 101: front end; 31: needle stand junction surface; 102: inwall; 311: front end; 103: rear end; 32: taper outer wall; 11: connected structure; 33: annular casing access slot; 12: taper inwall; 34: limited ring groove; 121: rear end; 36: chimeric ring; D1: cone cylinder internal diameter; 361: aerofluxus annular groove; 122: front end; 362: rear end face; D2: syringe internal diameter; 37: axis hole; 13: position limiting convex ring; 38: socket post; 131: front anchor ring; 40: syringe needle; 132: middle anchor ring; 41: needle stand; 133: rear anchor ring; 42: needle body; 134: chamfering; 14: embeded slot; 20: push rod; 21: pushing block; 22: little cone.

Detailed description of the invention

For ease of central idea represented in above-mentioned utility model content one hurdle is described, hereby express with specific embodiment.In embodiment, various different object describes in the ratio, size, deflection or the displacement that are suitable for illustrating, but not drawn in the ratio of actual components, and conjunction is first chatted bright.

As Fig. 1, this utility model advances and unloads needle-safety syringe, comprising: a syringe 10, is set in this syringe 10 and the joining base 30 and that the push rod 20, of reciprocally movement is combined in this syringe 10 front end is combined in the syringe needle 40 of this joining base 30 front end.

As shown in Figure 1, Figure 2, Fig. 3, front end 101 inwall of this syringe 10 establishes a connected structure 11 in order to assemble this joining base 30.This connected structure 11 comprises: taper inwall 12, molding taking shape in this syringe 10 front end 101 protrudes from this syringe 10 inwall and is connected in the position limiting convex ring 13 of the rear end of this taper inwall 12 and is formed in this syringe 10 inwall and is connected in the embeded slot 14 after this position limiting convex ring 13.The syringe internal diameter D2 that the front end 122 that the syringe internal diameter D1 that the rear end 121 of this taper inwall 12 defines is less than this taper inwall 12 defines.Anchor ring 131, one middle anchor ring 132 and a rear anchor ring 133 before this position limiting convex ring 13 comprises one.This middle anchor ring 132 is connected between this front anchor ring 131 and rear anchor ring 133.This front anchor ring 131 formed in convergent footpath backward from the rear end 121 of this taper inwall 12; This middle anchor ring 132 continues at the most minor diameter part of this front anchor ring 131, and this middle anchor ring 132 is parallel with the inwall 102 of this syringe 10; This rear anchor ring 133 is the anchor rings perpendicular to this syringe 10 inwall 102.This rear anchor ring 133 has a chamfering 134 with the place of continuing of middle anchor ring 132.This embeded slot 14 is depressed in the inwall 102 of this syringe 10.

This joining base 30 comprises the chimeric ring 36 that a needle stand junction surface 31 and is connected to this rear end, needle stand junction surface 31; One axis hole 37 runs through the center of this needle stand junction surface 31 and this chimeric ring 36.This needle stand junction surface 31 has a taper outer wall 32, and the angle of this taper outer wall 32 and axial length agree with mutually with the taper inwall 12 of this syringe 10.This needle stand junction surface 31 has an annular casing access slot 33, and this annular casing access slot 33 is established around this axis hole 37, and opening is in the front end 311 at this needle stand junction surface 31.The setting of this annular casing access slot 33 makes the periphery of this axis hole 37 form a socket post 38.This needle stand junction surface 31 separately has a limited ring groove 34, this limited ring groove 34 continue this taper outer wall 32 miner diameter end and dent into the outer wall at this needle stand junction surface 31 downwards.This chimeric ring 36 makes with elastomeric material, and the external diameter of this chimeric ring 36 equals the internal diameter of the embeded slot 14 of this syringe 10; The outer wall of this chimeric ring 36 establishes an aerofluxus annular groove 361.The rear end face 362 of this chimeric ring 36 is planes.

This joining base 30 is incorporated into this connected structure 11 from the front end 101 of this syringe 10.This taper outer wall 32 agrees with this taper inwall 12, and the front end 311 at this needle stand junction surface 31 trims with the front end 101 of this syringe 10.The position limiting convex ring 13 of this connected structure 11 is arranged in the limited ring groove 34 of this joining base 30.The chimeric ring 36 of this joining base 30 is embedded in the embeded slot 14 of this connected structure 11.

This joining base 30 enters in the process of this connected structure 11, the front anchor ring 131 of this position limiting convex ring 13 provides the function of a guiding, make that there is elastic chimeric ring 36 be slightly extruded by this front anchor ring 131 and middle anchor ring 132 and enter this embeded slot 14, the outer wall of chimeric ring 36 is close to the inwall of this embeded slot 14, thus reaches airtight effect; Further, the rear anchor ring 133 of this position limiting convex ring 13 provides the effect of this chimeric ring 36 nose circle perimembranous of a block, makes joining base 30 cannot depart from syringe 10 with the opposite direction of bonding position easily.Secondly, this position limiting convex ring 13 is snapped in the limited ring groove 34 of this joining base 30, further limits this joining base 30.The taper inwall 12 of this connected structure 11 agrees with mutually with the taper outer wall 32 of this joining base 30, this joining base 30 is more inwardly pushed away and more fits in this connected structure 11, and keeps the air-tightness of this joining base 30 and connected structure 11.

This syringe needle 40 comprises the needle stand 41 of a hollow and is connected to the needle body 42 of this needle stand 41 front end.The front end of this push rod 20 has a pushing block be made up of elastomeric material 21, and there is a little cone 22 in the centre, front end of this pushing block 21.In this utility model, push rod 20 and syringe needle 40 are all adopt existing structure, and this represents that this utility model remains the suitability of existing push rod 20 and syringe needle 40, can reduce the cost again developed.

Before using safety injector of the present utility model, this syringe needle 40 is linked in outside this socket post 38 by this annular casing access slot 33 with this needle stand 41.Be placed on this needle stand 41 with a plastic cement upper shield (not shown) and cover this needle body 42 at the syringe needle do not sealed off.Therefore medical personnel take untapped syringe needle 40 time, needle body 42 can not be touched.Sometimes, medical personnel are when being socketed syringe needle 40, a spinning force can be imposed in needle stand 41, make needle stand 41 bear a turn-knob power and be able to more deep being combined with socket post 38, now, above-mentioned this taper inwall 12 of agreeing with and this taper outer wall 32, play block effect, the thrust keeping this joining base 30 to bear coming from needle stand 41 and turn-knob power and can not to the internal displacement of syringe 10.

As Fig. 4, Fig. 5, this push rod 20 is free to move back and forth in this syringe 10, and it can push away forward from the rear end 103 of this syringe 10, until the pushing block 21 of push rod 20 front end contacts the rear end face 362 of the chimeric ring 36 of this joining base 30.When syringe 10 is empty, by the action that push rod 20 pushes away forward, the air in syringe 10 can be got rid of by needle body 42.Draw before medicinal liquid enters syringe 10 inside in bottle cap, the air (aerofluxus of empty needle cylinder) got rid of in syringe 10 is required.Then, protrude in medicine bottle by needle body 42, retract this push rod 20, the medicinal liquid in medicine bottle is entered in syringe 10 by this needle body 42.What deserves to be explained is, and though be the aerofluxus of empty needle cylinder or retract push rod extract medicinal liquid, moving back and forth of this push rod 20, all can not affect this joining base 30 and syringe needle 40.Then, medical personnel inject patient with syringe, push away this push rod 20 forward, and medicinal liquid is entered in patient body by needle body 42.What deserves to be explained is, needle body 42 stabs pricks the skin of patient and the resistance of muscle, by agreeing with of this taper inwall 12 and taper outer wall 32, makes this joining base 30 and needle body 42 all keep stablizing, without any rock.In addition, this joining base 30 is the inside, front end being bonded on syringe 10, without any the structure of convex dew, medical personnel therefore can not be hindered to use syringe.

As Fig. 5, push away this push rod 20 forward, medicinal liquid is entered in patient body by needle body 42.The rear end face 362 of the chimeric ring 36 of this joining base 30 is planes, center is then axis hole 37, and such structure can mate with the pushing block 21 of this push rod 20, when pushing block 21 is more and more close to this chimeric ring 36, the medicinal liquid of this syringe 10 is just less and less, and the resistance pushing away medicine will be more and more little.When pushing block 21 contacts the rear end face 362 of this chimeric ring 36, the little cone 22 in center of this pushing block 21 enters the aperture of this axis hole 37, thus seal this axis hole 37, and the rear end face 362 of pushing block 21 almost ring 36 chimeric with this is completely closely sealed, without any liquor residue between pushing block 21 and chimeric ring 36.But inevitable medicinal liquid still can remain in axis hole 37 and needle body 42, but these amount retained are few, for allowing the amount ignored, can not cause the problem of injecting liquid drug quantity not sufficient, and these amount retained are also required, because can prevent air from entering in human body cause thromboembolism.

As Fig. 6, after having injected, medical personnel extract needle body 42 out from patient skin and muscle, the resistance extracting needle body 42 out is very little, and have the annexation of fiting each other because of joining base 30 and the connected structure 11 of syringe 10, when therefore extracting needle body 42 out from patient, joining base 30 can't be made to loosen.Then, syringe needle 40 after using will depart from syringe 10, as long as push rod 20 exerts a force and pushes forward by medical personnel again, transmit a larger thrust by this pushing block 21 and give this chimeric ring 36 rear end face 362, because this rear end face 362 is planes, almost can receive the thrust transmitted from this pushing block 21 completely, this chimeric ring 36 is made to extrude the rear anchor ring 133 of this position limiting convex ring 13 forward, because this rear anchor ring 133 has a chamfering 134, this chamfering 134 can help this chimeric ring 36 to make because of extruding to produce and be slightly out of shape around, can by the middle anchor ring 132 of this position limiting convex ring 13, in addition, this chimeric ring 36 aerofluxus annular groove 361 also contribute to producing when this chimeric ring 36 is squeezed slightly being out of shape with by this position limiting convex ring 13.When chimeric ring 36 is completely by this position limiting convex ring 13, namely relieve this taper outer wall 32 and fit relation with the tapering of taper inwall 12, this joining base 30 departs from this syringe 10 together with this syringe needle 40.What deserves to be explained is, the action of this syringe needle 40 of removal shown in Fig. 6 belongs to propelling to unload pin type, completed by one-handed performance, and action is identical with the above-mentioned action pushing away medicine, just exerts a force a little.It is very important functions that one-handed performance unloads syringe needle 40; because when medical personnel extract syringe out from patient; medical personnel be one hand-held take syringe; another hand-held aseptic cotton is by the injection site hemostasis being pressed in patient; and now, as long as medical personnel aim at the bucket reclaiming discarded syringe needle, then press push rod 20 and can unload syringe needle 40; laborsaving, convenience very, and completely avoid the exposed empty window phase not protected outside of the syringe needle after use.

In sum, this utility model advances and unloads the structure of needle-safety syringe, compound mode, mode of operation are completely different from haulback type safe injection needle, and this utility model completely avoid all problems about haulback type safe injection needle described in utility model background.

Claims (5)

1. a needle-safety syringe is unloaded in propelling, and it is characterized in that, it comprises:

One syringe, has a push rod that can move back and forth along the inwall of this syringe in this syringe; The front inner wall of this syringe establishes a connected structure; This connected structure comprises the taper inwall, the molding that are formed in this syringe front end and protrudes from this syringe inwall and be connected in the position limiting convex ring of the rear end of this taper inwall and be formed in this syringe inwall and the embeded slot be connected in after this position limiting convex ring; The syringe internal diameter that the front end that the syringe internal diameter that the rear end of this taper inwall defines is less than this taper inwall defines;

One joining base, comprises the chimeric ring that a needle stand junction surface and is connected to this rear end, needle stand junction surface; One axis hole runs through this needle stand junction surface and this chimeric Ring current distribution; The outer wall of this joining base has a limited ring groove between this needle stand junction surface and this chimeric ring; This needle stand junction surface has a taper outer wall, and the angle of this taper outer wall is agreed with mutually with the taper inwall of this connected structure; This needle stand junction surface has an annular casing access slot, and this annular casing access slot definition one is around the socket post of this axis hole, and this annular casing access slot is opened on the front end at this needle stand junction surface; This joining base is positioned this connected structure, and this taper inwall and this taper outer wall closely agree with each other, and this position limiting convex ring is arranged in this limited ring groove, and this chimeric ring is positioned at this embeded slot;

One syringe needle, comprises the needle stand of a hollow and is connected to the needle body of this needle stand front end; This needle stand is socketed in this ring-type socket post.

2. as claimed in claim 1 propelling unloads needle-safety syringe, it is characterized in that, anchor ring after anchor ring, a middle anchor ring and before described position limiting convex ring comprises; Described middle anchor ring is connected between described front anchor ring and described rear anchor ring; This front anchor ring formed in convergent footpath backward from the rear end of described taper inwall; This middle anchor ring continues at the most minor diameter part of this front anchor ring, and this rear anchor ring is an anchor ring perpendicular to described syringe inwall; This position limiting convex ring is positioned at the limited ring groove of described joining base with this front anchor ring and this middle anchor ring, the nose circle perimembranous of chimeric ring described in the rear annular face contacts of this position limiting convex ring block.

3. as claimed in claim 2 propelling unloads needle-safety syringe, and it is characterized in that, the junction of described rear anchor ring and described middle anchor ring is a chamfering.

4. as claimed in claim 1 propelling unloads needle-safety syringe, and it is characterized in that, the rear end face of described chimeric ring is a plane.

5. as claimed in claim 1 propelling unloads needle-safety syringe, and it is characterized in that, the circumference of described chimeric ring establishes an aerofluxus annular groove.