CN2580977Y - Soft piston pulling-back type safety syringe - Google Patents

Abstract

The utility model relates to a pulling-back type safety syringe with a soft piston, which comprises a needle head, a needle cylinder and a plunger. The utility model is characterized in that the needle head is provided with a pulling back mechanism or an automatic pulling back mechanism by which the needle head can be pulled into the needle cylinder. A socket part of the needle head is formed above the needle cylinder below which an injection space part is arranged. The plunger is pushed into the injection space part in the needle cylinder from the rear of the needle cylinder, and the front end of the plunger is provided with a piston and a connecting piece which can be connected with the pulling back mechanism or a starting piece which can start the automatic pulling back mechanism. The piston is the soft piston which can be extruded to deform, and the piston is positioned on the vertex of the injection space part of the needle cylinder, the connecting piece on the plunger is not combined with the pulling back mechanism or the automatic pulling back mechanism is not started by the starting piece on the plunger. The piston is extruded to deform and the connecting piece is displaced and combined with the pulling back mechanism of the needle head or the starting piece is forward displaced to start the automatic pulling back mechanism under the state that the plunger bears push greater than prearranged force, the needle head is pulled into the needle cylinder, and the utility model is really a pulling-back type safety syringe.

Description

The haulback safety syringe of soft piston

Technical field

This utility model relates to a kind of syringe, particularly a kind of haulback safety syringe of soft piston.

Background technology

Since the medical science prosperity, become the quickest and effective therapeutic modality with the injector to inject medicament, and widely medical circle adopts, and syringe cylinder generally be with after promptly lose, therefore how to prevent to discard syringe accident when handling and stab medical personnel, thus bacterial infection, and the volume that how to reduce discarded syringe, become one of design focal point, thus haulback safety syringe just in response to and give birth to.So-called haulback safety syringe promptly is when the healthcare givers is pushed into the summit with the plunger of syringe, entry needle can be retracted in the syringe, and can dispose safely and want depleted syringe.

See also Fig. 1, it shows the structure of known a kind of manual haulback type safety syringe-drum, and wherein plunger 10 can spur or promote in front and back in syringe 30, and the front end of plunger 10 is provided with piston 11 and hook portion 21, hook portion 21 is to be based in outside the piston 11 front end end faces, forms neck post 20 parts of a length b therebetween.The bottom of syringe needle 1 then is provided with convergence part a, and when plunger 10 was shifted the summit onto forward, hook portion 21 can lunge among a of convergence part and collude with state with its formation, and is vertical and syringe needle 1 retracted enter syringe 30.

Shown in Figure 1, the convergence part a of syringe needle is a bottom center of being located at syringe needle 1, and the central authorities that hook portion 21 also is located at plunger 10 form the linking part.But known manual type haulback type syringe, its structure of pulling back still has other modes, and for example the convergence part of syringe needle is a periphery of being located at needle mount, and the linking part of plunger also is located at the periphery of plunger, closes or chimeric shape and be made as can collude mutually.

No matter be that a kind of manual haulback type safety syringe-drum, be generally and avoid syringe cylinder 30 in the time will not discarding as yet, the convergence part that is not intended to chien shih plunger 10 is pushed to the summit face, and the pull back convergence part of mechanism of unexpected and syringe needle combines, general all can design the linking part that makes plunger 10 front ends and touch syringe needle 1 base the time, must bestow a certain size above strength and promote plunger 10 and just can make and be connected part and combine with convergence part a.

The haulback type high-safety injection tube also utilizes the spring restoring force to be designed to automatic haulback type entry needle, yet, the automatic haulback type high-safety injection tube of this kind, before the startup spring was pulled back mechanism, the activation members of being located at plunger also must be promoted by the application of force, overcome certain resistance, could start the mechanism that pulls back.

Before the healthcare givers generally uses syringe to draw medicament, at first can be with the past post-tensioning of the push rod of syringe plunger rear end, air is drawn in the syringe, then needle body is thrust medicine bottle and pushing away before the plunger, the air that is drawn in the syringe is thrown in the medicine bottle, retracted plunger again and extract to syringe according to the scale of syringe medicament with required doses; And when injecting for sufferer, for avoiding the residual of pharmaceutical quantities, the healthcare givers all can will be pushed into the summit before the push rod, so no matter known manual haulback type or the syringe of haulback type automatically, in injection process, must apply strength at last and overcome and be connected and start the pull back resistance of mechanism of syringe needle.

Above-mentioned known haulback safety syringe exists following several shortcomings always:

1, as shown in Figure 1, because known haulback safety syringe, leave distance b (being neck post 20 length) between its piston 11 and the hook portion 21, make when drawing injection before the injection, can reduce drawing of injection dosage, that is to say that the healthcare givers must increase the extraction amount of liquid medicine when extracting medicament, make medical effect give a discount to avoid underdosage, in case healthcare givers's carelessness simultaneously causes take out lacking of pharmaceutical quantities, has also reduced medical effect, with the development that influences the state of an illness.

2 and when the healthcare givers uses syringe as sufferer injection medicament, because of piston 11 front end end faces can't arrive the 0ml position that is positioned at scale summit indicatrix A representative, and still have injection to exist in the space of formation piston 11 and hook portion 21 distance b, so the healthcare givers need apply strength and promote plunger 10 to the summit, the strength that this kind must be applied suddenly in injection process will cause the impression of pain for sufferer.

In view of this, this creator develops a kind of haulback safety syringe of soft piston.

Summary of the invention

This utility model is the haulback safety syringe that a kind of soft piston will be provided, and makes it draw medicament accurately with solution, reposefully plunger is pushed into the summit, with the technical problem of the pain of avoiding being injected the patient.

It is such solving the problems of the technologies described above the technical scheme that is adopted:

A kind of haulback safety syringe of soft piston includes a syringe needle, a syringe, a plunger, it is characterized in that:

This syringe needle is provided with and can makes syringe needle be drawn in the mechanism that pulls back in the syringe;

This syringe, the syringe top forms the syringe needle receptacle portion, and the below then is an injection space portion, and syringe needle is to be incorporated on the syringe needle receptacle portion;

This plunger, can advance injection space portion in syringe by the syringe rear, the linking part that the front end of plunger is provided with piston and can be connected with the mechanism that pulls back, wherein piston is the soft piston that is extruded distortion for force-applied, this piston is positioned at the injection space portion summit of syringe, and the linking part on this plunger does not combine with the mechanism that pulls back, and this plunger is subjected to one greater than under the default strength promotion state, this piston extrusion, it is connected part generation displacement and combines with the mechanism that pulls back of syringe needle;

The mechanism that pulls back of this syringe needle can be connected the bonded convergence part of part with plunger in the needle mount setting;

This syringe needle convergence part is to be made as a sour jujube of pulling that is formed at the base middle body, and the linking part of plunger is the hook portion that protrudes in piston central authorities, the bottom of this hook portion is to be contact condition with piston-top surface, and hook portion is to be located at a piston boit front end, and this piston boit is the front end that support piston is located at plunger;

This hook portion front end is to be provided with an extending column, and this hook portion is thrust in the sour jujube of pulling of needle mount, and its extending column enters injection pipeline space;

The injection scale on this injection space portion summit is to be 0;

The mechanism that pulls back of this syringe needle is the mechanism that pulls back automatically;

The linking part of the front end setting of this plunger is for starting the activation members of the mechanism that pulls back automatically;

This piston is on the injection space portion summit of syringe, activation members on this plunger does not start the mechanism that pulls back automatically, this plunger is subjected to one greater than under the default strength promotion state, the piston extrusion, and the activation members on its plunger displacement forward starts the mechanism that pulls back automatically that syringe needle is drawn in syringe inside.

This utility model is to include a syringe needle, a syringe and a plunger; This syringe needle is provided with and can makes syringe needle be drawn in pull back the automatically mechanism or the mechanism that manually pulls back of syringe, this plunger front end is provided with soft piston, and be provided with and start pull back the automatically activation members of mechanism of syringe needle, maybe can be connected in manually the pull back linking part of mechanism of syringe needle, plunger is to be inserted in the syringe by the opening of back end of syringe, and this syringe is to be a hollow cylinder, and its place ahead forms the syringe needle receptacle portion, insert combination for syringe needle, the rear then is an injection space portion; Piston is made of elastic material, and the linking part or the activation members of plunger front end, its bottom surface just protrudes from the piston nose end face.Under the injection user mode, the upper surface of this piston is connected part or activation members with plunger bottom surface is to be in contact with one another; So when injection, plunger can be shifted the summit reposefully onto, the whole injections of medicament are gone out, and in the time will discarding, piston be can push and linking part or activation members displacement forward made, leave contact condition with piston upper surface, and advance in the mechanism that pulls back of syringe needle, start the mechanism that pulls back automatically, or combine with the convergence part of the mechanism that manually pulls back, enter in the syringe thereby syringe needle can be left behind, make it can draw medicament accurately thereby solved, reposefully plunger is pushed into the summit, with the technical problem of the pain of avoiding being injected the patient.

This utility model is simple in structure, it is a kind of haulback safety syringe of soft piston, this piston is made of the rubber-like material, make when drawing medicament and injection medicament, the piston nose end face can be pushed to the syringe top, enable to extract medicament according to scale accurately, reposefully drug injection is gone out, after injection, the force-applied crimp of piston, make linking part or the activation members linking of being located at plunger or start the mechanism that pulls back that is located at syringe needle, and syringe needle is drawn in the syringe, and be applicable to various manual, the structure of automatic haulback type syringe and syringe or similar articles; Its advantageous effect is as follows:

1, this utility model is by the design that is connected distance between part or activation members with plunger of soft piston and minimizing piston nose face, make when drawing medicament and can draw medicament accurately, when injection medicament, plunger is shifted the summit onto must be not afterburning suddenly, injection finishes and remakes the operation that the application of force advances plunger and pulls back, and has avoided by injection patient's pain;

2, this utility model can reduce the residual quantity of injection in the syringe, improves medical effect.

Description of drawings

Fig. 1 is the structure chart for known syringe.

Fig. 2 is the three-dimensional exploded view of this utility model one embodiment.

Fig. 3 is this utility model embodiment state profile.

Fig. 4 is the profile that this utility model embodiment draws the injection state.

Fig. 5 a is that this utility model embodiment hook portion clip is in the profile of the sour jujube state of pulling.

Fig. 5 b is that this utility model embodiment hook portion clip is in the enlarged drawing of the sour jujube state of pulling.

Fig. 6 is the pull back profile of state of this utility model embodiment syringe needle.

Fig. 7 a is the application of force figure of this utility model haulback safety syringe when medicament is injected to 0ml gradually by Nml.

Fig. 7 b is the application of force figure of known haulback safety syringe when medicament is injected to 0ml gradually by Nml.

Fig. 8 is another embodiment generalized section that this utility model hook portion top is provided with extending column.

Fig. 9 is that the hook portion clip of Fig. 8 is in the amplification profile of the sour jujube state of pulling.

The specific embodiment

See also shown in Figure 2ly, the manual haulback safety syringe embodiment that it shows a kind of soft piston includes a syringe needle 40, a syringe 50 and a plunger 60, wherein:

This syringe needle 40, include a needle body 41 and and supply the fixedly needle stand 42 of needle body 41, these needle stand 42 inner hollow tubulars that form, and be provided with the sour jujube 43 of pulling in these needle stand 42 hollow tubulars, and the quill shaft of needle body 41 and needle stand 42 middle bodies are hollow state, and interconnect with the middle body of the sour jujube 43 of pulling, form the space that medicament can pass through.

This syringe 50 is to be a cylindrical hollow cylindrical shell, and the syringe rear is an injection space portion 52, and its outside is printed with a graduation apparatus (unit is ml) that can show pharmaceutical quantities, and syringe 50 the place aheads form syringe needle receptacle portion 51, to hold the needle stand 42 in conjunction with syringe needle 40.

This plunger 60 includes a piston 61 and a push rod 62, wherein this piston 61 is made of the rubber-like material, and these push rod 62 front ends are provided with a piston boit 621 (seeing also Fig. 3), and piston boit 621 tops are provided with hook portion 622, and piston 61 is to be sleeved on the piston boit 621.

Shown in Fig. 2,3, the piston 61 of this embodiment is to be made as the rubber-like material, piston boit 621 length of push rod 62 front ends then are made as suitable with the thickness of piston 61, promptly when piston 61 is arranged on the piston boit 621, piston boit 621 only has hook portion 622 outstanding pistons 61, and makes hook portion 622 bottom contact pistons 61.Consult Fig. 3,4, when push rod 62 pulls back when drawing injection medicament, piston 61 front end end faces are the 0ml positions that can be positioned at scale summit indicatrix A representative, so can draw medicament accurately.

And during injection medicament,, and can be pushed into the summit reposefully because of the front end end face of its piston 61 and hook portion 622 bottom surfaces of piston boit 621 are to be in contact with one another, the whole injections of medicament are gone out.When discarding, as Fig. 5 a, 5b and shown in Figure 6, piston 61 can be pushed extruding and contract and be out of shape, make the hook portion 622 of piston boit 621 can leave contact condition with piston 61 upper surfaces, advance the sour jujube 43 of pulling of needle stand 42, form clip with the sour jujube 43 of pulling and collude with state, enter in the syringe 50 and syringe needle 40 can be left behind.

Please consult shown in Fig. 7 a and the 7b again, application of force situation when diagramatic content can demonstrate this utility model and known haulback safety syringe injection use respectively, wherein Y-axis is represented healthcare givers's application of force size, X-axis is represented the surplus of injection medicament, initial point represents that the pharmaceutical quantities in the syringe is Nml, remains to 0ml gradually.

All be injected with the pharmaceutical quantities of Nml in this utility model and the known haulback safety syringe syringe, when injection, dosage remain to b (ml) before, this utility model is big or small the same with the known haulback safety syringe institute application of force, and when scale b (ml) is arrived in injection, known haulback safety syringe is shifted pulling during sour jujube of contact needle stand bottom this moment onto on the hook portion because of piston boit, be subjected to resistance, the healthcare givers must apply strength and residual pharmacy could be injected away this moment, and the increase of the application of force will make that the patient produces misery; And this utility model is when injection, and the application of force is steady, must afterburning not be pushed to the summit up to piston, and the injection medicament finishes.

See also Fig. 8,9, this utility model also can be in the foregoing description, form an extending column 623 in these hook portion 622 front ends, when so the hook portion 622 of piston boit 621 is thrust the sour jujube 43 formation clip states of pulling of needle stand 42, the formed extending column 623 of hook portion 622 front ends can deeply occupy needle stand 42 volume inside, thereby more reduces the residual quantity of injection.

Though this utility model is in each figure, the syringe needle receptacle portion 51 that shows this syringe 50 is to form a undergauge state, yet if syringe needle 40 is the structures that adopt replaceable needle body 41, when its base sectional area increases, also the syringe needle receptacle portion 51 of this syringe 50 can be set as straight tubular, make syringe needle receptacle portion 51 identical, and can insert combination for syringe needle 40 equally with the internal diameter of syringe 50 integral body.

Again, in above-mentioned graphic and the explanation, the sour jujube 43 of pulling of needle mount is the convergence part that constitutes the mechanism that manually pulls back, and it is set as the arrangement of pulling the sour jujube shape and being located at needle mount central authorities only is an embodiment of manual type haulback type syringe.In fact, soft piston of the present utility model with and the plunger structure that is connected part be to can be applicable to various difformities are connected part and syringe needle convergence part with the plunger of diverse location manual haulback type safety syringe-drum.Again, soft piston of the present utility model and with the structure that is connected part and can be applicable to the safety syringe-drum of automatic hand pulling type, at this moment, the linking part on the plunger then forms and starts the pull back activation members of mechanism of syringe needle.Therefore, but all not departing from the local correction of this utility model spirit or change and all should be considered as the disclosed practical range of this case.

In sum, the improvement structure that this utility model really can provide a kind of piston to be connected part or activation members with the mechanism that pulls back is used for the haulback type syringe, has on the industry value undoubtedly, so propose utility application in accordance with the law.

Claims (6)

1, a kind of haulback safety syringe of soft piston includes a syringe needle, a syringe, a plunger, it is characterized in that:

This syringe needle is provided with and can makes syringe needle be drawn in the mechanism that pulls back in the syringe;

This syringe, the syringe top forms the syringe needle receptacle portion, and the below then is an injection space portion, and syringe needle is to be incorporated on the syringe needle receptacle portion;

This plunger, can advance injection space portion in syringe by the syringe rear, the linking part that the front end of plunger is provided with piston and can be connected with the mechanism that pulls back, wherein piston is the soft piston that is extruded distortion for force-applied, this piston is positioned at the injection space portion summit of syringe, and the linking part on this plunger does not combine with the mechanism that pulls back, and this plunger is subjected to one greater than under the default strength promotion state, this piston extrusion, it is connected part generation displacement and combines with the mechanism that pulls back of syringe needle.

2, the haulback safety syringe of soft piston according to claim 1 is characterized in that: the mechanism that pulls back of this syringe needle can be connected the bonded convergence part of part with plunger in the needle mount setting.

3, the haulback safety syringe of soft piston according to claim 2, it is characterized in that: this syringe needle convergence part is to be made as a sour jujube of pulling that is formed at the base middle body, and the linking part of plunger is the hook portion that protrudes in piston central authorities, the bottom of this hook portion is to be contact condition with piston-top surface, and hook portion is to be located at a piston boit front end, and this piston boit is the front end that support piston is located at plunger.

4, the haulback safety syringe of soft piston according to claim 3 is characterized in that: this hook portion front end is to be provided with an extending column, and this hook portion is thrust in the sour jujube of pulling of needle mount, and its extending column enters injection pipeline space.

5, the haulback safety syringe of soft piston according to claim 1 is characterized in that: the injection scale on this injection space portion summit is to be 0.

6, the haulback safety syringe of soft piston according to claim 1 is characterized in that:

The mechanism that pulls back of this syringe needle is the mechanism that pulls back automatically;

The linking part of the front end setting of this plunger is for starting the activation members of the mechanism that pulls back automatically;

This piston is on the injection space portion summit of syringe, activation members on this plunger does not start the mechanism that pulls back automatically, this plunger is subjected to one greater than under the default strength promotion state, the piston extrusion, and the activation members on its plunger displacement forward starts the mechanism that pulls back automatically that syringe needle is drawn in syringe inside.

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