CN2338020Y - Safety syringe being broken after use by back drawing - Google Patents

Abstract

The utility model relates to a safety injection syringe capable of being broken by back drawing after use, which comprises a needle cylinder, a plunger piston, a needle stand, an injection needle and a needle drawing mechanism, wherein a first needle drawing component shaped at the needle stand or the plunger piston is provided with a unidirectional pivot stopper thorn, a second needle drawing component is provided with a stopper hook, and the stopper hook is fastened firmly with the stopper thorn so as to ensure that the personnel can not be punctured. A needle point can be bent to be destroyed by bunting against a jaw of the needle cylinder. The inner wall of a needle stand bore and the external wall of the needle stand are provided with leakproof structures for a plurality of circles of seal retaining rings so as to ensure a tight leak prevention between the injection needle and the needle stand. The utility model also comprises a safety mechanism provided with a safety fastener plate, a first buckled portion and a second buckled portion, and the first and the second buckled portions are fastened with each other so that the stopper hook can be positioned adjacent to the stopper thorn. The utility model can prevent the needle drawing mechanism from being connected with each other because of misoperation before the injection is finished.

Description

The safety injector of pulling back and destroying

This utility model relates to a kind of sanitation and health-care field and is input into medium in the body or imposes on apparatus on the body, particularly relates to a kind of safety injector of pulling back and destroying.

Since using the disposable syringe that once promptly abandons to be widely used, a large amount of depleted syringes bring environmental pollution problems, and the syringe after using is often stabbed medical personnel, cause the patient on one's body virus or antibacterial along with the syringe after using infects to medical personnel, and cause medical personnel to catch an illness or dead.These incidents, often there is hearsay various countries.Particularly catching the innate immunity insufficiency disorder time group virus that can't treat at present is HIV (human immunodeficiency virus) etc., more causes medical personnel to be subjected to not guilty injury.

In order to address this problem, there are many inventors to drop into intelligence, financial resources one after another, do all one can to develop the haulback type syringe of various different structures.For example, utilize the elastic force that is installed in the spring between syringe and the piston that the entry needle that injection is over is retracted in the syringe.But owing to be liquid medicine injection, so the material of spring is limited by strictness, so that its complex structure, manufacturing cost is too high.Also there are many inventors successively to invent the various safety injectors that do not need to use spring, expectation can will inevitably be pushed to the bottom of syringe by injecting plunger in the syringe at the end, and utilize the clip of being invented that plunger and entry needle are snapped together mutually, and when retracting plunger, together entry needle is drawn in the syringe, thereby reached the purpose of avoiding entry needle to stab medical personnel or other people on the scene.

In order to prevent liquid leakage, and in order to prevent entry needle from the syringe accidental, so combining between entry needle and the syringe must be firmly.If but between entry needle and syringe combine too firmly the time, entry needle is not easy again to pull out in the back stitching tube.These two require contradiction each other, and are perplexing all inventors all the time.This is because in order to prevent that entry needle is from the syringe accidental, so combining between entry needle and the syringe must be firmly, if and between entry needle and the syringe combine too firmly the time, entry needle is not easy again to pull out in the back stitching tube, so above-mentioned two is the structure of contradiction each other.By the end of so far, all have applied for that all there is aforesaid drawbacks in the safety injector of utility model patent, so that do not reach the practical stage yet.This shows that above-mentioned conventional injector still has many defectives, and the assistant officer waits to be improved.

Because the defective that above-mentioned conventional injector exists, the design people is based on abundant practical experience and Professional knowledge, through constantly studying, design, and after studying sample repeatedly and improving, creates this utility model finally.

Main purpose of the present utility model is, overcome the defective that conventional injector exists, and provide a kind of safety injector of pulling back and destroying of new structure, it is had both can make plunger be easy to and the entry needle knot that interlocks, can make plunger and entry needle button tie very firmly again, and can positively entry needle be pulled out in the back stitching tube, and destroy effectively, can avoid entry needle to stab medical personnel or other people's on the scene effect.

The purpose of this utility model is realized by following technical scheme.According to a kind of safety injector of pulling back and destroying that the utility model proposes, be provided with syringe, needle stand and entry needle, it is characterized in that it comprises syringe, plunger, needle stand, entry needle and plucking machine structure, wherein: above-mentioned syringe, be provided with first end and second end, and portion is provided with the syringe endoporus within it, wherein first end is provided with the syringe needle socket, this syringe needle socket is provided with the needle stand hole, is formed with ring-type jaw portion between syringe endoporus and the needle stand hole; Above-mentioned plunger is provided with first end and second end, and this first end is equiped with piston, and is inserted in syringe, and this plunger has first axle center; Above-mentioned needle stand is provided with first end and second end, the outer rim of this second end be lug in the syringe endoporus of syringe first end, this needle stand has second axle center; Above-mentioned entry needle is embedded in the syringe needle socket of first end of needle stand; Above-mentioned plucking machine structure, being provided with first pulls out needle member and second and pulls out needle member, wherein: this first pulls out needle member, be provided with first end and second end, this first end is one of them position that is connected among two positions such as first end of plunger and second end of needle stand, this first pulls out needle member and is provided with the sour jujube of pulling at least, each sour jujube of pulling is provided with first end and second end, wherein first end is connected in first second end that pulls out needle member rotationally, and first end distance of the sour jujube of pulling is defined as first distance from wherein arbitrary axle center in two axle center such as first axle center and second axle center, second end of sour jujube of pulling extends towards first second end that pulls out needle member, and wherein arbitrary axle center in second end of the sour jujube of pulling, two axle center such as distance first axle center and second axle center under free state is defined as second distance, and this second distance is less than first distance, it is nearer that second end distance of sour jujube of pulling pulls out first for the end of needle member from first, and that first end distance of the sour jujube of pulling pulls out first for the end of needle member from first is far away, and this sour jujube of pulling forms the structure as agnail; This second pulls out needle member, be provided with first end and second end, this first end is the another one position that is connected among two positions such as first end of plunger and needle stand second end, this second first end that pulls out needle member is formation neck post, second pulls out second for the end of needle member for forming the hook of pulling, this hook of pulling is provided with hook portion, and this hook portion is provided with the hook face that extends along radial direction, when first end of plunger is pushed to first end of syringe, the hook portion of this hook of pulling struts and slips over second end of sour jujube of pulling, and when plunger is drawn second end of past syringe by first end from syringe, the hook face of hook portion of hook of pulling contacts at second end of the sour jujube of pulling, and force second end of the sour jujube of pulling to clamp the neck post firmly, and prop up the hook face of the hook portion of the hook of pulling firmly, needle stand and entry needle are drawn in the syringe.

The purpose of this utility model can also further realize by following technical measures.

The aforesaid safety injector of pulling back and destroying, it further comprises and is provided with at least two sour jujubes of pulling, and is radial direction arrangement with aforesaid axle center.

The aforesaid safety injector of pulling back and destroying, it further comprises the leakproof structure, this leakproof structure comprise at least one circle around the sealing and fixing ring, it is arranged on one of them position in two positions such as the inwall in needle stand hole of syringe and outer wall of needle stand, this multi-turn around sealing and fixing ring sealing medicinal liquid between two positions such as outer wall of the inwall in needle stand hole and needle stand, leak out, and this needle stand is easier to be pulled away out in the needle stand hole after injection ends.

The aforesaid safety injector of pulling back and destroying, it further comprises the leakproof structure, this leakproof structure comprise at least one circle around the sealing and fixing ring, it is arranged in two positions such as the inwall in needle stand hole of syringe and outer wall of needle stand, all be respectively arranged with separately one the circle or two the circle or multi-turn around the sealing and fixing ring, and each other lug in the inwall in the needle stand hole of syringe and the outer wall of needle stand.

The aforesaid safety injector of pulling back and destroying, it further comprises members such as insurance cramp, the first button portion and the second button portion, and wherein: this insures cramp, is provided with first end and second end, and this first end is linked to second end of syringe; This first button portion is arranged at second end that insures cramp; This second button portion is arranged at second end of plunger, and this second button portion and the first button portion are interlocked the hook of pulling be positioned the to pull vicinity of sour jujube, and the hook of avoiding pulling plays into each other's hands because of maloperation with the sour jujube of pulling.

The aforesaid safety injector of pulling back and destroying, the wherein said sour jujube of pulling is the position to be set be the structure of reversing of position each other with its structural design of hook of pulling.

The aforesaid safety injector of pulling back and destroying, it further comprises members such as insurance cramp, the first button portion and the second button portion, and wherein: this insures cramp, is provided with first end and second end, and this first end is linked to second end of syringe; This first button portion is arranged at second end that insures cramp; This second button portion is arranged at second end of plunger, and this second button portion and the first button portion are interlocked the hook of pulling be positioned the to pull vicinity of sour jujube, and the hook of avoiding pulling plays into each other's hands because of maloperation with the sour jujube of pulling.

The aforesaid safety injector of pulling back and destroying, the wherein said sour jujube of pulling is the position to be set be the structure of reversing of position each other with its structural design of hook of pulling.

This utility model compared with prior art has tangible advantage and good effect.By above technical scheme as can be known, this utility model mainly comprises syringe, plunger, needle stand, entry needle and plucking machine structure, first of the needle stand or the plunger that take shape in of plucking machine structure pulls out needle member and is provided with the sour jujube of pulling, and this sour jujube of pulling is can unidirectional pivot moving, takes shape in second of plunger or needle stand and pulls out needle member and be provided with the hook of pulling.When the piston of plunger is pulled to the end, the hook of pulling be easy to and pull sour jujube mutually rank close and play into each other's hands, can detain again behind the two button knot ties very firmly, and then needle stand and entry needle pulled back together to syringe, can guarantee that entry needle can not stab personnel, and the needle point of entry needle is propped up syringe ring-type jaw portion and crooked the destruction; It also comprises the leakproof structure, the multi-turn that this leakproof structure comprises one of them position in two positions such as the inwall in the needle stand hole that is arranged on syringe and the outer wall of needle stand around the sealing and fixing ring, make both closely leakproofs between entry needle and the needle stand, more easily entry needle is pulled away needle stand again; It also comprises the insurance institution that is provided with member such as insurance cramp, the first button portion and the second button portion etc., and the second button portion and the first button portion are interlocked the hook of the pulling sour jujube that is positioned to pull is contiguous, can prevent the plucking machine structure injection not be over because of the faulty operation accident connected to each other.Therefore this utility model is pulled back and the safety injector destroyed has following effect:

1, this utility model safety injector of pulling back and destroying, it can prevent liquid leakage, also can prevent entry needle from the syringe accidental, more can make entry needle be easy to pull out in the back stitching tube.

2, this utility model both can make plunger be easy to and entry needle button knot, can make plunger and entry needle button tie very firmly again, and can pull out entry needle in the back stitching tube really.

3, this utility model can prevent entry needle mistake button before finishing injection.

In sum, this utility model both can make plunger be easy to and the entry needle knot that interlocks, can make plunger and entry needle button tie very firmly again, and can positively entry needle be pulled out in the back stitching tube, and can destroy effectively, and has the effect that to avoid entry needle to stab medical personnel or other people on the scene.No matter it structurally or bigger improvement is all arranged on the function, and have large improvement technically, and produced handy and practical effect, and have the effect of enhancement really, thereby be suitable for practicality more, really is a new and innovative, progressive, practical new design.

Concrete structure of the present utility model is provided in detail by following examples and accompanying drawing thereof.

Fig. 1 is the exploded perspective view of this utility model first embodiment.

Fig. 2 is the combination stereogram of this utility model first embodiment.

Fig. 3 is the entry needle of this utility model first embodiment and the side face upwarding stereogram of needle stand.

Fig. 4 is the section of structure of this utility model first embodiment when sucking medicinal liquid.

Fig. 5 is that this utility model first embodiment is over injecting liquid drug, the section of structure the when hook of pulling of being located at piston rod is colluded with the sour jujube of pulling of being located at needle stand.

Fig. 6 is that this utility model first embodiment medicinal liquid is about to the injection hook structure front view when pulling sour jujube of pulling when being over.

Fig. 7 is that the hook of pulling of this utility model first embodiment is by the sour jujube and the structure front view of sour jujube when having caught of being pulled of pulling.

Fig. 8 is that this utility model first embodiment is over injecting liquid drug, again with withdrawn needle to syringe, and entry needle is from trend is other when toppling over section of structure.

Fig. 9 is the partial enlarged drawing that shows regional area A from Fig. 7 with the dotted line circle, show among the figure plunger down just pulling and two sour jujubes of pulling simultaneously towards the plunger cramping.

Figure 10 is this utility model first embodiment with after withdrawn needle is to the syringe, and plunger pushes forward and entry needle the section of structure after destroying of curling that bends again.

Figure 11 is the profile of this utility model second embodiment when sucking medicinal liquid.

Figure 12 is the entry needle of this utility model second embodiment and the front view of needle stand.

Figure 13 is the entry needle of this utility model second embodiment and the amplification inclinating view of needle stand.

Figure 14 is that this utility model second embodiment is over injecting liquid drug, the section of structure the when sour jujube of pulling of being located at plunger rod is worked in collusion with the hook of pulling of being located at needle stand.

Figure 15 is the entry needle of this utility model the 3rd embodiment and the front view of needle stand.

Figure 16 is the entry needle of this utility model the 3rd embodiment and the amplification inclinating view of needle stand.

Figure 17 is that this utility model the 3rd embodiment is over injecting liquid drug, the section of structure the when sour jujube of pulling of being located at plunger rod is worked in collusion with the hook of pulling of being located at needle stand.

Below in conjunction with accompanying drawing and preferred embodiment, to according to its concrete structure of the safety injector of pulling back and destroying, feature and the effect thereof that the utility model proposes, describe in detail as after.

See also Fig. 1 to shown in Figure 4, the safety injector 20 that this utility model is pulled back and destroyed, it comprises: syringe 21, plunger 22, needle stand 23, entry needle 24 and plucking machine structure, wherein:

Above-mentioned syringe 21 is provided with first end 28 and second end 29, and portion then is provided with syringe endoporus 27 within it, wherein, this first end 28 is provided with syringe needle socket 30, and this syringe needle socket 30 is provided with needle stand hole 31, is formed with ring-type jaw portion 33 between syringe endoporus 27 and the needle stand hole 31;

Above-mentioned plunger 22 is provided with first end 34 and second end 35, and this first end 34 is equiped with piston 36, and is inserted in syringe 21, and this plunger 22 has first axle center 47;

Above-mentioned needle stand 23 is provided with first end 37 and second end 38, the outer rim of this second end 38 be lug in the syringe endoporus 27 of syringe 21 first ends 28, needle stand 23 has second axle center 48;

Above-mentioned entry needle 24 is embedded in the syringe needle socket 30 of needle stand 23 first ends.

See also Fig. 3 to plucking machine structure shown in Figure 9, above-mentioned, it is provided with first and pulls out needle member 61 and second and pull out needle member 62, wherein:

This first pulls out needle member 61, be provided with first end 63 and second end 64 (as shown in Figure 3), first end 63 is connected in one of them position among two positions such as first end 34 of plunger 22 and needle stand 23 second ends 38, promptly be connected in second end 38 (extremely shown in Figure 10) of needle stand 23, or be connected in first end 34 (extremely shown in Figure 17) of plunger 22 as Figure 11 as Fig. 1;

This first pulls out needle member 61 and is provided with two sour jujubes 25,25 ' of pulling, and is provided with the sour jujube 25 of pulling in this utility model at least, and this each pull sour jujube 25 or sour jujube 25 ' of pulling is provided with first end 49 and second end 50 (as shown in Figure 9), wherein:

This sour jujube 25 of pulling, 25 ' first end 49, be connected in first rotationally and pull out second for the end 64 (as Fig. 7, shown in Figure 9) of needle member 61, and wherein arbitrary axle center in two axle center such as the sour jujube 25 of pulling, 25 ' first end, 49 distance first axle center 47 and second axle center 48 promptly the distance in first axle center 47 or second axle center 48 be defined as first distance 51;

This sour jujube 25 of pulling, 25 ' second end 50, it is for extending towards first second end 64 that pulls out needle member 61, and this sour jujube 25 of pulling, wherein arbitrary axle center in 25 ' second end 50, two axle center such as distance first axle center 47 and second axle center 48 under free state is that the distance in first axle center 47 or second axle center 48 is defined as second distance 52, and this second distance 52 is less than above-mentioned first distance 51, because this sour jujube 25 of pulling, it is nearer that 25 ' second end 50 distance first is pulled out first for the end 63 of needle member 61, and the sour jujube 25 of pulling, it is far away that 25 ' first end 49 distance first is pulled out first for the end 63 of needle member 61, and sour jujube 25 so this is pulled, 25 ' for forming structure and the effect just like agnail;

This second pulls out needle member 62, is provided with first end 65 and second end 66 (as shown in Figure 9), wherein:

This second first end 65 that pulls out needle member 62, another one position among first end 34 that to be connected in two positions such as first end 34 of plunger 22 and second end 38 of needle stand 23 be plunger 22 and second end 38 of needle stand 23, it is first end 34 (extremely shown in Figure 10) of plunger 22 as Fig. 1, or being connected in second end 38 (as Figure 11 to shown in Figure 17) of needle stand 23, this second first end 65 that pulls out needle member 62 is for forming 58 (as shown in Figure 9) of neck post;

This second second end 66 that pulls out needle member 62 is the formation hook 26 of pulling, and this hook 26 of pulling is provided with hook portion 55, and this hook portion 55 is provided with the hook face 56 that extends along radial direction;

By aforesaid special tectonic, see also Fig. 5 to shown in Figure 9, when first end 34 of plunger 22 is pushed to first end 28 of syringe 21 (as Fig. 5, shown in Figure 9), 55 of the hook portions of hook 26 of pulling strut and slip over the sour jujube 25 of pulling, 25 ' second end 50, and when this plunger 22 is drawn second end 29 toward syringe 21 by first end 28 from syringe 21 (as Fig. 4, shown in Figure 9), the hook face 56 of the hook portion 55 of this hook 26 of pulling contacts at second end 50 of the sour jujube 26 of pulling, and force the sour jujube 25 of pulling, 25 ' second end 50,50 clamp neck post 58 firmly, and prop up the hook face 56 of the hook portion 55 of the hook 26 of pulling firmly, so that needle stand 23 and entry needle 24 are drawn in syringe 21.

See also Fig. 3 to shown in Figure 9, the safety injector 20 that this utility model is pulled back and destroyed can optionally be provided with two or more sour jujubes 25 of pulling at least, and makes radial direction arrangement with aforesaid axle center.

See also Fig. 1 to shown in Figure 9, this utility model further comprises the leakproof structure, this leakproof structure comprise around sealing and fixing ring 32, it is arranged on one of them position in two positions such as the inwall in needle stand hole 31 of syringe 21 and the outer wall of needle stand 23, and should around sealing and fixing ring 32 can optionally be set at least two circles.By this multi-turn around sealing and fixing ring 32 can prevent that medicinal liquid from leaking out between two positions such as outer wall of the inwall in needle stand hole 31 and needle stand 23, but can after injection ends, make needle stand 23 be easier to be pulled away out in the needle stand hole 31.

See also Figure 15 to shown in Figure 17, be this utility model the 3rd embodiment, can certainly be optionally, in two positions such as the inwall in syringe 21 needle stand holes 31 and the outer wall of needle stand 23, all further be provided with respectively separately one the circle or two the circle or more multi-turn around sealing and fixing ring 32,39, and each other lug in the inwall in the needle stand hole 31 of syringe 21 and the outer wall of needle stand 23.

See also Fig. 1, shown in Figure 2, the safety injector 20 that this utility model is pulled back and destroyed can further comprise members such as insurance cramp 41, the first button portion 42 and the second button portion 43, wherein:

This insures cramp 41, is provided with first end 45 and second end 46, and wherein, this first end 45 is linked to second end 29 of syringe 21;

This first button portion 42 is arranged at second end 46 that insures cramp 41;

This second button portion 43 is arranged at second end 35 of plunger 22, and this second button portion 43 can be interlocked with the first button portion 42, and the hook 26 of will pulling be positioned the to pull vicinity of sour jujube 25, and hook 26 plays into each other's hands because of maloperation with the sour jujube 25 of pulling to avoid pulling.

See also Figure 11 to shown in Figure 14, be second embodiment of the present utility model, its operating process is identical to the operating process (being detailed later) of first embodiment shown in Figure 10 with Fig. 1.Both structural difference just be to pull sour jujube 25,25 ' with the position that is provided with of the hook 26 of pulling be transposing each other, promptly this pull sour jujube and its structural design of hook of pulling are the position to be set be the structure of reversing of position each other, this repeats no more.

See also Fig. 1 to shown in Figure 4, below use situation of the present utility model is described as follows.Before the use, entry needle 24 is installed in the needle stand hole 31 of syringe needle socket 30, is very closely and securely with the sealing and fixing ring 39 of needle stand hole 31 inwalls by the sealing and fixing ring 32 of needle stand 23 to combine (as shown in figure 17); Again with entry needle protection sleeve 44 enclosures in the outer rim of entry needle 24, and plunger 22 and piston 36 filled in the syringe endoporus 27 of syringe 21; And the first button portion 42 that will insure cramp 41 is fastened on the second button portion 43 that is located at plunger 22 second ends 35, make pull hook 26 and the sour jujube 25 of pulling keep near but the position that separates, to play into each other's hands because of maloperation.

In the time will injecting, entry needle 24 is inserted stung in medicinal liquid earlier, then untie insurance cramp 41, plunger 22 is pulled out outward, so that medicinal liquid is sucked in syringe 21 (as shown in Figure 4).Again up, and plunger 22 slightly up pushed away, the air of syringe 21 tops is discharged from the needle point 40 of entry needle 24, can implement injection the patient with entry needle 24.

See also Fig. 5 and shown in Figure 9, when injection finished, plunger 22 was pulled to the end, and 26 on the hook of pulling that is arranged at plunger 22 is pushed the sour jujube 25,25 ' of pulling easily open, and automatically with pull sour jujube 25, the 25 ' collusion of being located at needle stand 23 second ends 38.Because aforesaid second distance 52 is less than first distance 51, and the sour jujube 25 of pulling, 25 ' second end 50 is nearer apart from syringe needle socket 30, and this sour jujube 25 of pulling, 25 ' first end 49 is far away apart from syringe needle socket 30, that is, owing to have and make less second distance 52 nearer apart from syringe needle socket 30, and the first bigger distance 51 is designed apart from syringe needle socket 30 structures far away, so, see also Fig. 8, shown in Figure 9, when plunger 22 past pulling back, two relative sour jujubes 25 of pulling, 25 ' hook face 56 past pressing down because of the hook 26 of being pulled, and respectively with its kink 59,59 ' is that center of rotation is towards arrow 57,57 ' distinguish indicated direction and rotate, force two relative sour jujubes 25 of pulling, 25 ' simultaneously restraints folder firmly towards the centre of the hook 26 of pulling, and the drop-down strength of this plunger 22 is big more, and the strength of bundle folder is just big more.Therefore the hook face 56 of hook 26 of pulling also just can be clamped very securely and do not had the anxiety (as shown in Figure 9) that gets loose, this point is this utility model particular structure feature, and other conventional injector can't be obtained especially.

See also shown in Figure 8, after this entry needle 24 is pulled back to the syringe 21 fully, the sour jujube 25,25 owing to pull ' and pull and close for making loosening rank between the hook 26, therefore make the needle point 40 of entry needle 24 will be because of steadily not toppling over, and make its needle point 40 be positioned at the below of the ring-type jaw portion 33 of syringe 21 to side.Please consult Fig. 8 and shown in Figure 2 again in conjunction with consulting; with entry needle protection sleeve 44 diameter smaller tail 60 slotting being embedded in (as shown in Figure 8) in the needle stand hole 31 that originally were nested with outside needle stand 23; seal needle stand hole 31, and the needle point 40 that makes entry needle 24 is can be from the needle stand hole 31 unexpected not protruding.After entry needle 24 is pulled out syringe 21, because the sour jujube 25,25 of pulling ' and pull and become loosening rank between the hook 26 and close relation.Therefore when the needle point 40 of entry needle 24 in case after being pulled back to syringe 21, will inevitably be because of steady and do not topple over, and make needle point 40 be positioned at the below of the ring-type jaw portion 33 of syringe 21 to side so that can block needle point 40 by means of this ring-type jaw portion 33.

Seeing also shown in Figure 10ly at last, is this utility model first embodiment with after withdrawn needle is to the syringe, and plunger pushes forward and entry needle the structural representation after destroying of curling that bends again.Push plunger 22 forward this moment, makes the needle point 40 of entry needle 24 prop up the ring-type jaw portion 33 of syringe 21 and be bent destruction.

The above, it only is preferred embodiment of the present utility model, be not that this utility model is done any pro forma restriction, every foundation technical spirit of the present utility model all still belongs in the scope of technical solutions of the utility model any simple modification, equivalent variations and modification that above embodiment did.

Claims (8)

1, a kind of safety injector of pulling back and destroying is provided with syringe, needle stand and entry needle, it is characterized in that it comprises syringe, plunger, needle stand, entry needle and plucking machine structure, wherein:

Above-mentioned syringe be provided with first end and second end, and portion is provided with the syringe endoporus within it, and wherein first end is provided with the syringe needle socket, and this syringe needle socket is provided with the needle stand hole, is formed with ring-type jaw portion between syringe endoporus and the needle stand hole;

Above-mentioned plunger is provided with first end and second end, and this first end is equiped with piston, and is inserted in syringe, and this plunger has first axle center;

Above-mentioned needle stand is provided with first end and second end, the outer rim of this second end be lug in the syringe endoporus of syringe first end, this needle stand has second axle center;

Above-mentioned entry needle is embedded in the syringe needle socket of first end of needle stand;

Above-mentioned plucking machine structure, it is provided with first and pulls out needle member and second and pull out needle member, wherein:

This first pulls out needle member, be provided with first end and second end, this first end is one of them position that is connected among two positions such as first end of plunger and second end of needle stand, this first pulls out needle member and is provided with the sour jujube of pulling at least, each sour jujube of pulling is provided with first end and second end, wherein first end is connected in first second end that pulls out needle member rotationally, and first end distance of the sour jujube of pulling is defined as first distance from wherein arbitrary axle center in two axle center such as first axle center and second axle center, second end of sour jujube of pulling extends towards first second end that pulls out needle member, and wherein arbitrary axle center in second end of the sour jujube of pulling, two axle center such as distance first axle center and second axle center under free state is defined as second distance, and this second distance is less than first distance, it is nearer that second end distance of sour jujube of pulling pulls out first for the end of needle member from first, and that first end distance of the sour jujube of pulling pulls out first for the end of needle member from first is far away, and this sour jujube of pulling forms the structure as agnail;

This second pulls out needle member, be provided with first end and second end, this first end is the another one position that is connected among two positions such as first end of plunger and needle stand second end, this second first end that pulls out needle member is formation neck post, this second second end that pulls out needle member is to form the hook of pulling, this hook of pulling is provided with hook portion, and this hook portion is provided with the hook face that extends along radial direction, when first end of plunger is pushed to first end of syringe, the hook portion of hook of pulling struts and slips over second end of sour jujube of pulling, and when plunger is drawn second end of past syringe by first end from syringe, the hook face of hook portion of hook of pulling contacts at second end of the sour jujube of pulling, and force second end of the sour jujube of pulling to clamp the neck post firmly, and prop up the hook face of the hook portion of the hook of pulling firmly, needle stand and entry needle are drawn in the syringe.

2, the safety injector of pulling back and destroying according to claim 1 is characterized in that it further comprises to be provided with at least two sour jujubes of pulling, and is radial direction arrangement with aforesaid axle center.

3, the safety injector of pulling back and destroying according to claim 1 and 2, it is characterized in that it further comprises the leakproof structure, this leakproof structure comprise at least one circle around the sealing and fixing ring, it is arranged on one of them position in two positions such as the inwall in needle stand hole of syringe and outer wall of needle stand, this multi-turn around sealing and fixing ring sealing medicinal liquid between two positions such as outer wall of the inwall in needle stand hole and needle stand, leak out, and this needle stand is easier to be pulled away out in the needle stand hole after injection ends.

4, the safety injector of pulling back and destroying according to claim 1 and 2, it is characterized in that it further comprises the leakproof structure, this leakproof structure comprise at least one circle around the sealing and fixing ring, it is arranged in two positions such as the inwall in needle stand hole of syringe and outer wall of needle stand, all be respectively arranged with separately one the circle or two the circle or multi-turn around the sealing and fixing ring, and each other lug in the inwall in the needle stand hole of syringe and the outer wall of needle stand.

5, the safety injector of pulling back and destroying according to claim 3 is characterized in that it further comprises members such as insurance cramp, the first button portion and the second button portion, wherein:

This insures cramp, is provided with first end and second end, and this first end is linked to second end of syringe;

This first button portion is arranged at second end that insures cramp;

This second button portion is arranged at second end of plunger, and this second button portion and the first button portion are interlocked the hook of pulling be positioned the to pull vicinity of sour jujube, and the hook of avoiding pulling plays into each other's hands because of maloperation with the sour jujube of pulling.

6, the safety injector of pulling back and destroying according to claim 5 is characterized in that the described sour jujube of pulling is the position to be set be the structure of reversing of position each other with its structural design of hook of pulling.

7, the safety injector of pulling back and destroying according to claim 4 is characterized in that it further comprises members such as insurance cramp, the first button portion and the second button portion, wherein:

This insures cramp, is provided with first end and second end, and this first end is linked to second end of syringe;

This first button portion is arranged at second end that insures cramp;

This second button portion is arranged at second end of plunger, and this second button portion and the first button portion are interlocked the hook of pulling be positioned the to pull vicinity of sour jujube, and the hook of avoiding pulling plays into each other's hands because of maloperation with the sour jujube of pulling.

8, the safety injector of pulling back and destroying according to claim 7 is characterized in that the described sour jujube of pulling is the position to be set be the structure of reversing of position each other with its structural design of hook of pulling.

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