CN103330976B - Safe injector - Google Patents

Abstract

The invention discloses a safe injector which relates to the technical field of medical instruments, and comprises a needle cylinder (1) and a push rod (3), as well as an injection needle (10) and a connecting tube (2), wherein the injection needle (10) can be replaced as per use requirements. According to the invention, when the safe injector is in use, the traditional operating custom is barely changed, the use is convenient, and the effect is reliable; the injection needle (10) can retract and hide through an automatic retraction mechanism after finishing injecting to ensure that medical staff can be free from the unexpected harm of a contaminated needlepoint; after the injection is completed, the push rod (3) cannot be pulled back as being clamped by clamping rings (1e), so that the push rod cannot be reused, the real disposable injector is realized, and further the cross transmission of blood-borne diseases is avoided; support sheets (1c) are adopted to support the connecting tube (2), and a conical head pulling back rod (3d) is sleeved with a compression spring (7) in a flat pressing annular manner, so that the structural design is more reasonable, the safe injector is more suitable for the automatic assembly production of a production line, the quality is reliable, the qualification rate is high, and the cost is reduced.

Description

A kind of safety injector

Technical field

The present invention relates to technical field of medical instruments, relate to a kind of safety injector, particularly relate to a kind of disposable safety injector or a kind of disposable self-destroy safety injector.

Background technology

At present, promote the use of disposable syringe and serve corresponding positive role to preventing cross infection, flash past 30 years soon, later re-recognize and really sum up, these disposable syringe Problems existing: the disposable sterilized syringe of prior art---comprise push rod and to pull back break-off type, steel disc self locking and destructing formula, the manual haulback type of syringe needle, syringe needle relies on the disposable sterilized syringe of the various ways such as spring tension automatic retracting type and additional sleeve type---due to the imperfection of product structure design, lack the reliable function that some are required, make product can not meet the needs on using safely completely.Such as: 1. the disposable sterilized syringe of prior art, because product is with substantially keeping intact later, entry needle expose need back cover entry needle protective sleeve time, this process very easily makes medical personnel suffer the unexpected injury of exposed pollution needle point, especially infects the infectious disease such as hepatitis B, acquired immune deficiency syndrome (AIDS) and can bring extreme influence to the health of medical worker; 2. though this product is named as " disposable sterilized syringe " when formulating standard, but most syringe can not reach only expendable object structure, and can reuse greatly, namely say that " single use " of these products is only get on to be strict with from management so to do, repeatedly using and recycling of disposable sterilized syringe, causes the serious consequence of iatrogenic disease cross infection still to appear in the newspapers repeatly; 3. when using dry powder injection preparation liquid medicine injection, noting after solution in medicine powder container, injection needle is crossed rubber stopper due to puncture and produces the impact of distortion or generation fineness and sharpness, from the strict sense, must not be used further to inject human body for the entry needle of the medicine bottle plug that punctures during preparating liquid, further, some countries have been had to formulate " entry needle of the medicine bottle plug mistake that punctures during preparating liquid can not be used further to this respect Compulsory Feature of injecting human body or regulation ".And the disposable sterilized syringe of prior art, though comprise self locking and destructing formula, push rod break-off type of manually pulling back to say exchangeable needle, syringe needle is with later can not be hidden, (syringe separately adds a sleeve pipe outward to additional sleeve type, by sleeve pipe forward slip after injection uses, though make injection needle hidden, but double to consume material and increase the significant wastage that operational motion is also physical resources and human resources), syringe needle relies on spring tension automatic retracting type, syringe needle relies on the needle automatic retracting type safety injector of negative pressure retracting type etc. various ways, this several syringe is when with post processing later, its metal device (entry needle and Compress Spring and steel disc etc.) and working of plastics are difficult to do classification process, major part after causing this series products to use all will enter incinerator and burns and cause originally recoverable material can not recycling, and, the large quantity of exhaust gas produced after a large amount of plastic materials burns exacerbates the pollution to atmospheric environment, social life rubbish is also doing classification, available garbage recycling is got up, not only can reduce the rubbish total amount of 30-40%, can also be that society saves a large amount of physical resources.China is the big country using disposable sterilized syringe, its use amount is by annual at least ten hundred million calculating, two is exactly more than 200 hundred million during the last ten years, by every set level counterpoise 5 grams calculating, that is exactly 5000 tons every year, two more than ten years were exactly more than 10 ten thousand tons, the whole world is how many is again considerably more than these data above-described certainly, and these shortcomings are because the defect such as safe not of the structure of above-described various dissimilar disposable syringe or shortcoming or improving not of structure are caused.

Summary of the invention

Instant invention overcomes above-described various disposable sterilized injector of the prior art and syringe needle and the shortcoming existed in the safety injector that bounce back automatically (can be comprised manually), provide a kind of or innovate and a kind ofly can to ensure a kind of safety injector that this product can be destroyed after a single use voluntarily or a kind of disposable safety injector or a kind of disposable self-destroy safety injector the structure of product itself, alternatively the invention provides and a kind of there is initiative leading in era development process the disposible safety syringe that syringe updates.For convenience's sake, below all referred to as a kind of safety injector.

The object of the invention is to adopt following technical solution to realize:

A kind of safety injector, comprise syringe and push rod, described push rod is inserted therein chamber from syringe big opening end,

It is characterized in that:

Described push rod is a core structure; longitudinally a bit of ejector sleeve is had at described push rod top; the internal diameter of described ejector sleeve is less than the internal diameter of push rod cylindrical shell; a bundle pitch plane is formed between push rod and ejector sleeve; the pull back cydariform sealing ring tight fit of bar of the ejector sleeve at described push rod top and conehead seals, and described push rod outer wall arranges chuck;

Also comprise injection needle to pull back the connection tube of bar and injection needle with for being connected conehead;

Described connection tube is the middle tube in through hole, tubule head and the through hole inner bottom part of injecting needle base extra heavy pipe end of connection tube are all arranged to outer conehead and the internal taper hole with identical tapering, the tubule stage casing female thread be provided with injecting needle base in large mouth of connection tube spins and the external screw thread sealed, this tubule is supported toward the part that lower process is thick mutually with syringe osculum end inner plane, the part that the central protrusion of connection tube is thick has two anti-rotation ribs at least, again toward being arranged with the circular groove being nested with O RunddichtringO, circular groove bundle joint down forms resistance and gives up the throne;

Be provided with resistance with the adjacent position of anti-rotation rib of connection tube in described syringe osculum end endoporus to ship and resell on another market, the resistance in syringe endoporus is shipped and resell on another market and the anti-rotation rib interdigitation in opposite directions of connection tube;

Described injection needle comprises injection needle, injecting needle base, protective sleeve;

Described injecting needle base is the middle tubular body in through hole, be adhesively fixed in injecting needle base tubule end through hole injection needle, be configured to the female thread spun with the tubule middle and lower part of connection tube or the external screw thread in stage casing in the through hole of extra heavy pipe end, the arranged outside of injecting needle base tubule end has spline rib;

Be provided with for back-off in fixed support thin slice in syringe; Described support slice is made up of main ring and inner periphery mesh sheet, and the main ring of support slice and the interior back-off of syringe connect and fix, and the inner periphery mesh sheet of this support slice supports on the resistance being resisted against connection tube thick section bundle joint place gives up the throne;

Also comprise collar, the outside of described collar is provided with Shu Jie, is provided with the outer back-off for fixed card ring in the big opening end of syringe;

Also comprise Compress Spring, described Compress Spring is manufactured by metal material, and described Compress Spring ring set is pulled back on bar at described conehead, and Compress Spring one end is resisted against conehead and pulls back on the transverse plane of bar, and the other end is resisted against on the bundle pitch plane of push rod inner chamber.

A kind of safety injector as previously discussed; it is characterized in that: described protective sleeve arranges resistance within it and turns rib; in its appearance, anti-skidding rib is set; described protective sleeve is enclosed within injecting needle base; resistance in protective sleeve turns the spline rib interdigitation in opposite directions of rib and injecting needle base, and described injection needle metal material manufactures.

It is noted that

When by dress or replacing injection needle; hand-held protective sleeve rotates; injecting needle base and connection tube spin; resistance in the anti-rotation rib of connection tube and syringe endoporus is shipped and resell on another market interdigitation in opposite directions; simultaneously; the effect of the spline rib that the resistance in protective sleeve turns rib and injecting needle base interdigitation in opposite directions, makes injecting needle base and connection tube spin and causes tight and seal.

A kind of safety injector as previously discussed, it is characterized in that: also comprise, make the pull back integral material of bar of described conehead and select elastomeric material, described conehead bar of pulling back comprises: conical head, conehead neck, transverse plane and cydariform sealing ring, expose push rod pushing tow pipe part when assembling with push rod and be configured to conical head structure, described conical head is connected with entirety by conehead neck, and cydariform seal ring structure is arranged at the position that conehead neck down fixes with the ejector sleeve of push rod.

A kind of safety injector as previously discussed, is characterized in that: the other end that described push rod inserts syringe inner chamber utilizes grafting, clamping or other known connected modes to arrange one by hands.

A kind of safety injector as previously discussed, is characterized in that: arranging a passage by hands central authorities.

Safety injector as previously discussed, is characterized in that: arrange at least 2 shock absorption strips in the one side be connected with push rod by hands.

A safety injector as previously discussed, is characterized in that: described in by the another side that hands is connecting with push rod, tread plate is set.

A kind of safety injector of the present invention has following beneficial effect compared with prior art:

1. the present invention:

1) connection tube is designed to be resisted against syringe inner chamber osculum end, use the O RunddichtringO of ring set on the circular groove of connection tube and syringe seals, on the resistance that the inner periphery mesh sheet of the support slice of syringe internal fixtion is resisted against connection tube thick section bundle joint place is given up the throne, resistance now on the anti-rotation rib of connection tube and syringe is shipped and resell on another market interdigitation in opposite directions, the female thread that connection tube exposes external screw thread in the taper end of syringe and injecting needle base spins, due to the resistance in the anti-rotation rib of connection tube and syringe endoporus ship and resell on another market between in opposite directions the effect of interdigitation and the resistance of protective sleeve turn rib and injecting needle base spline rib between the combined effect of interdigitation in opposite directions, hand-held protective sleeve rotates and injecting needle base tightly can be threaded onto connection tube and seal, and the situation of simultaneously rotating mutually can not be produced, increase convenience when injection needle is changed and reliability,

2) resistance that the inner periphery mesh sheet of the support slice of syringe internal fixtion is resisted against connection tube thick section bundle joint place is given up the throne, anti-back safety during acupuncture treatment is guaranteed, at injecting liquid drug close to time complete, the ejector sleeve of push rod upper end upwardly, ejector sleeve promotes to be resisted against inner periphery mesh sheet that connection tube thick section bundle joint place hinder the support slice of giving up the throne and expands to surrounding and leave resistance and give up the throne, inner periphery mesh sheet due to support slice adopts network structure to arrange and the base portion of inner periphery mesh sheet adopts comparatively thin structure, the resistance that the inner periphery mesh sheet that the ejector sleeve moved up promotes support slice easily leaves connection tube to surrounding expansion is given up the throne, cause whole smooth operation easily reliable,

3) the Compress Spring pressure screen conehead be arranged in push rod is pulled back on bar, change more syringe by the way of Compress Spring ring set on needle stand of pressure screen, improve syringe and resist the power of entry needle acupuncture treatment retraction and the safety of product;

2. when the present invention uses, do not change traditional operating habit completely, easy-to-use, reliable effect, while having injected, entry needle is still hidden by automatic retracted mechanism automatic retracted, guarantee that medical personnel avoid the unexpected injury suffering to pollute needle point, thus bring the fabulous effect of the following stated:

1) a large amount of medical expenses brought because polluting needle stick injury medical worker have been saved;

2) avoid medical personnel to catch because of needle stick injury the misery of the suffered human body and spirit;

3) due to the present invention:

(1) be stuck when injecting complete by the collar that the outer back-off of syringe big opening end fixes at the chuck of push rod arranged outside;

(2) injection needle injection after automatic retracted and cannot repeat assembling use, because supporting the vibrational power flow of book sheet, when injecting complete, the ejector sleeve on push rod top makes the inner periphery mesh sheet of support book sheet can not set back after surrounding expansion and cannot repeat assembling use, from the structural design of these two aspects, used syringe cannot be reused and realize this syringe single use truly, thoroughly stopping, avoiding reuse syringe and the blood borne disease cross infection caused;

(3) particularly Compress Spring is arranged in push rod, the injection needle when injecting complete, injecting needle base, connection tube is all retracted in push rod by the Compress Spring ring set of diastole, especially the injection needle of patient body fluid is contacted, injecting needle base, connection tube, conehead is pulled back bar and push rod, press hands, syringe, collar, protective sleeve is by the Compress Spring Secure isolation of diastole, post processing work after syringe uses is extremely simple, as long as only simply open by hands, metalwork (Compress Spring and injection needle) easily can be poured out from push rod, metalwork (injection needle and Compress Spring) can be separated rapidly with working of plastics, bounce back owing to using rear injection needle, the injection needle of contacted patient body fluid, injecting needle base, connection tube is by the Compress Spring ring set of diastole, a large amount of recyclings of working of plastics are made to have had safety guarantee, decrease a large amount of burning amounts, also save the burning cost because of a large amount of working of plastics, these 2 aspects fully show patent of the present invention and have fabulous practicality, fabulous social benefit, fabulous environmental benefit and fabulous economic benefit,

3. the originality of structural design of the present invention, connection tube is designed to be resisted against syringe inner chamber osculum end, use the O RunddichtringO of ring set on the circular groove of connection tube and syringe seals, on the resistance that in utilizing in syringe, the inner periphery mesh sheet of the support slice that back-off is fixed is resisted against connection tube thick section bundle joint place is given up the throne, make to resist acupuncture treatment power and had guarantee, resistance now on the anti-rotation rib of connection tube and syringe is shipped and resell on another market interdigitation in opposite directions, the female thread of external screw thread and injecting needle base that connection tube exposes the taper end of syringe spins, because the resistance in protective sleeve turns the spline rib interdigitation in opposite directions of rib and injecting needle base, hand-held protective sleeve rotates can be tightened in connection tube by injecting needle base, and can not produce together with rotation or revolve and not tight problem, simultaneously taper end and the injecting needle base large mouth intracavity bottom of connection tube arrange the outer conehead of identical tapering and internal taper hole and seal, the convenience adding operation and the security reliability increased when entry needle is had an acupuncture treatment, because a kind of safety injector structural design of the present invention obtains rationally, and assembling product of the present invention is also than more simple and convenient on needle stand by Compress Spring ring set, make product automatic Composition production line more convenient, both improve output, in turn ensure that product quality, because the qualification rate of product improves, add the raising of output, the reduction of product cost, therefore, there is fabulous economic benefit,

4. in sum, because a kind of safety injector of the present invention has good practicality and creativeness, there is fabulous social benefit, fabulous economic benefit, therefore, this by be a kind of be worth world-wide deployment application, also very likely become a kind of have initiative lead the disposable safety injector truly or disposable self-destroy safety injector that in era development process, syringe are updated or referred to as safety injector.

Accompanying drawing explanation

Fig. 1 is the structure sectional view of a kind of safety injector of the present invention;

Fig. 2 is the structure sectional view of the present invention when complete moment injected by medicinal liquid;

Fig. 3 is that the present invention completes injection needle automatic retracted status architecture sectional view after injecting liquid drug;

Fig. 4 is syringe structure for amplifying sectional view of the present invention;

Fig. 5 is support book sheet structure for amplifying sectional view of the present invention;

Fig. 6 is support book sheet structure for amplifying top view of the present invention;

Fig. 7 is collar structure for amplifying sectional view of the present invention;

Fig. 8 is collar structure for amplifying top view of the present invention;

Fig. 9 is syringe of the present invention, supports book sheet, the structure for amplifying sectional view after collar combination;

Figure 10 is the structure sectional view of connection tube of the present invention;

Figure 11 is the structure upward view of connection tube of the present invention;

Figure 12 is the structure sectional view of injecting needle base of the present invention;

Figure 13 is the structure top view of injecting needle base of the present invention;

Figure 14 is injection needle of the present invention and protective sleeve, injecting needle base combinative structure sectional view;

Figure 15 is push rod of the present invention and piston, by hands structure sectional view;

Figure 16 is that conehead of the present invention returns Tiebar structure sectional view.

In figure:

1 syringe; 1a resistance is shipped and resell on another market; Back-off in 1b; 1c support slice; 1c1 main ring;

The outer back-off of 1c2 inner periphery mesh sheet 1d; 1e collar; 1e1 restraints joint; 2 connection tubes;

2a external screw thread; 2b anti-rotation rib; 2c circular groove; 2d resistance is given up the throne; 2e connection tube through hole; 2f hole convex; The outer conehead of 2g; 3 push rods; 3a ejector sleeve; 3b restraints pitch plane;

3c piston; 3d conehead is pulled back bar; 3d1 conical head; 3d2 conehead neck;

3d3 transverse plane; 3d4 cydariform sealing ring; 3e chuck; 4 injecting needle bases; 4a female thread;

4b needle stand through hole; 4c spline rib; 4d internal taper hole; 5 press hands; 5a shock absorption strip;

5b tread plate; 5c passage; 60 RunddichtringOs; 7 Compress Springs; 8 protective sleeves;

8a resistance turns rib; The anti-skidding rib of 8b; 9 injection needles; 10 injection needles.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the present invention is described in more detail.

Embodiment 1:

A kind of safety injector of the present invention, as shown in Fig. 1 ~ Figure 16, comprise syringe 1 and push rod 3, described push rod 3 is inserted therein chamber from the big opening end of syringe 1,

It is characterized in that:

Described push rod 3 is a core structure; longitudinally a bit of ejector sleeve 3a is had at described push rod 3 top; the internal diameter of described ejector sleeve 3a is less than the internal diameter of push rod 3 cylindrical shell; between push rod 3 and ejector sleeve 3a, form one restraint the pull back cydariform sealing ring 3d4 tight fit of bar 3d of pitch plane 3b, the ejector sleeve 3a at described push rod 3 top and conehead and seal, described push rod 3 outer wall arranges chuck 3e;

Also comprise connection tube 2 and injection needle 10;

Described injection needle 10 comprises: injecting needle base 4, injection needle 9 and protective sleeve 8;

Described connection tube 2 is the middle tube in through hole, tubule head and the through hole inner bottom part of injecting needle base extra heavy pipe end of connection tube 2 are all arranged to outer conehead and the internal taper hole with identical tapering, the female thread 4a that the tubule stage casing of connection tube 2 is provided with injecting needle base 4 in large mouth spins and the external screw thread 2a sealed, this tubule is supported toward the part that lower process is thick mutually with syringe 1 osculum end inner plane, the part that the central protrusion of connection tube 2 is thick has two anti-rotation rib 2b at least, the resistance arranged in the anti-rotation rib 2b of connection tube 2 and syringe 1 aperture is shipped and resell on another market 1a interdigitation in opposite directions, stage casing is down provided with the circular groove 2c being nested with O RunddichtringO 6 again, circular groove 2c bundle joint down forms resistance and to give up the throne 2d,

Described injecting needle base 4 is a tubular body, and described injection needle 9 is bonded and fixed in the through hole 4b of injecting needle base 4 taper end; The through hole 4b of described injecting needle base 4 is provided with female thread 4a in the large mouth of butt end, and described injecting needle base 4 taper end arranged outside has the spline rib 4c of cross-rib shape; Be provided with for back-off 1b in fixed support thin slice 1c in syringe 1;

Described support slice 1c is made up of main ring 1c1 and inner periphery mesh sheet 1c2; this support slice 1c enters from the big opening end of described syringe 1; main ring 1c1 and the described interior back-off 1b of support slice 1c connect and fix, and the inner periphery mesh sheet 1c2 of this support slice 1c supports the resistance being resisted against the thick section bundle joint place of connection tube 2 and gives up the throne on 2d;

Also comprise Compress Spring 7, described Compress Spring 7 uses metal material manufacture, described Compress Spring 7 pours into from the large mouth of push rod 3, the conehead bar 3d that pulls back also pours into from the large mouth of push rod 3, directly being pushed into the pull back cydariform sealing ring 3d4 of bar 3d and the ejector sleeve 3a tight fit of push rod 3 of conehead seals fixing, at this moment Compress Spring 7 is sleeved on conehead by pressure screen and pulls back on bar 3d, Compress Spring 7 one end support conehead pull back bar 3d transverse plane 3d3 on, the other end is supported on the bundle pitch plane 3b of push rod 3;

Also comprise collar 1e, described collar 1e is connected and fixed by the outer back-off 1d of the big opening end of syringe 1, and the arranged outside of described collar 1e has bundle joint 1e1, arranges the outer back-off 1d structure of fixed card ring 1e in the big opening end of syringe.(front end of push rod 3 is set with a piston 3c, and to carry out sealing be prior art, do not elaborate at this).

Traditional operating habit is not changed completely when the present invention uses, when the medicinal liquid in syringe 1 inject will inject complete time, conehead in the masthead ejector sleeve 3a endoporus of push rod 3 pull back bar 3d top conical head 3d1 contact connection tube 2, when push rod 3 continues to advance, the pull back conical head 3d1 at bar 3d top of conehead makes a forcible entry into inside the hole convex 2f of connection tube through hole 2e big opening end of connection tube 2, hole convex 2f block conehead pull back bar 3d top conical head 3d1 under conehead neck 3d2, when push rod 3 continues to advance, the pull back cydariform sealing ring 3d4 of bar 3d of conehead moves down, the ejector sleeve 3a of push rod 3 masthead reveals the inner periphery mesh sheet 1c2 to the contact support slice 1c that rises, the ejector sleeve 3a of push rod 3 masthead advances due to the continuation of push rod 3, medicinal liquid inject complete while, the inner periphery mesh sheet 1c2 of support slice 1c expands outwardly and causes resistance that inner periphery mesh sheet 1c2 leaves connection tube 2 and to give up the throne 2d by ejector sleeve 3a, the conehead bar 3d inner chamber that connected tube 2 pushes up shift-in push rod 3 gradually of pulling back causes the pull back cydariform sealing ring 3d4 of bar 3d of conehead to depart from the position, tight card division of the ejector sleeve 3a at push rod 3 top, conehead pulls back bar 3d under the effect of Compress Spring 7 Diastolic Force, conehead pulls back injecting needle base 4 and injection needle 9 that bar 3d connected by connection tube 2 simultaneously from the inner chamber resilience of trend push rod 3, the Diastolic Force of Compress Spring 7 of design should be enough to make injection needle 9 to speed away human injection position and overall automatic retracted, fall into intracavity in push rod 3 and terminate injection, injection needle 9 is fully retracted the inside of syringe and hidden, therefore, cover protective sleeve 8 need not be returned after end injection, while injecting liquid drug is complete, push rod 3 also shifts the bottom of syringe 1 onto simultaneously, at this moment the chuck 3e of push rod 3 also crosses the collar 1e be arranged on the outer back-off 1d of syringe 1 big opening end simultaneously, after end injection, push rod 3 because of blocked by collar 1e push rod 3 chuck 3e and cannot pumpback, this structure has great benefit: the sharp instrument that one side medical personnel and post processing personnel definitely avoid the needle point having suffered contaminated injures, syringe products structure of the present invention itself makes used syringe can not be re-assembled and stop reusing of this safety injector product on the other hand, ensure that a kind of safety injector of the present invention reaches single use truly and the object of self-destruction.

Embodiment 2

The present embodiment and embodiment 1 basic simlarity, as illustrated in figs. 1-16, difference is:

A kind of safety injector of the present embodiment; the surfaces externally and internally also comprising protective sleeve 8 is provided with resistance and turns rib 8a and anti-skidding rib 8b; protective sleeve 8 cover is inserted on injecting needle base 4; injection needle 9 is shielded; the resistance of protective sleeve 8 inner surface turns the spline rib 4c interdigitation in opposite directions on rib 8a and injecting needle base 4; be convenient to before injecting screw and change injection needle 10 time spin, the anti-skidding rib 8b of protective sleeve 8 outer surface is convenient to grip, and described injection needle uses metal material manufacture.

Embodiment 3

The present embodiment is in embodiment 1 or 2, any one is substantially similar, and as illustrated in figs. 1-16, its difference is:

Also comprise, make the pull back integral material of bar 3d of described conehead and select elastomeric material, the described conehead bar 3d that pulls back comprises: conical head 3d1, conehead neck 3d2, transverse plane 3d3 and cydariform sealing ring 3d4, expose push rod 3 masthead ejector sleeve 3a part when assembling with push rod 3 and be designed to conical head 3d1 structure, described conical head 3d1 is connected with entirety by conehead neck 3d2, and cydariform sealing ring 3d4 structure is arranged at the position that conehead neck 3d2 down fixes with push rod 3 ejector sleeve 3a.

Embodiment 4

The present embodiment is substantially similar to embodiment 3, and as illustrated in figs. 1-16, difference is:

The present embodiment is also included in the other end that push rod 3 inserts syringe 1 and utilizes grafting, clamping or other known connected modes by putting one by hands 5.

Embodiment 5

The present embodiment is substantially similar to embodiment 4, and as illustrated in figs. 1-16, difference is:

The present embodiment also comprises push rod 3 to by arranging a passage 5c between hands 5; The present embodiment push rod 3 can prevent product when standing to need negative pressure to vacuum sterilization to arranging a passage 5c by hands 5, and conehead is pulled back the inside and outside air pressure balance of bar 3d, does not cause conehead to pull back bar 3d displacement because of negative pressure.

Embodiment 6

The present embodiment and embodiment 5 basic simlarity, as illustrated in figs. 1-16, difference is:

This is pressed hands 5 and arranges at least two shock absorption strip 5a in the one side contacted with push rod 3, this shock absorption strip 5a for conehead pull back bar 3d resilience time play good cushioning effect, more feel light when particularly allowing medical personnel operate.

Embodiment 7

The present embodiment is substantially similar to embodiment 6, and as illustrated in figs. 1-16, difference is:

By hands, tread plate 5b is set at the another side connected with push rod described in the present embodiment also comprises.

It should be noted that above embodiment is only used to be further described the present invention; be not used to limit claim of the present invention; when not departing from spirit of the present invention and design; those of ordinary skill in the art can carry out various improvement or change, still belong to the protection domain of application claims.

Claims (7)

1. a safety injector, comprise syringe (1) and push rod (3), described push rod (3) is inserted therein chamber from syringe (1) big opening end,

It is characterized in that:

Described push rod (3) is a core structure; longitudinally a bit of ejector sleeve (3a) is had at described push rod (3) top; the internal diameter of described ejector sleeve (3a) is less than the internal diameter of push rod (3) cylindrical shell; between push rod (3) and ejector sleeve (3a), form one restraint pitch plane (3b); pull back cydariform sealing ring (3d4) tight fit of bar (3d) of the ejector sleeve 3a of the masthead of described push rod (3) and conehead seals, and described push rod (3) outer wall arranges chuck (3e);

Also comprise and to pull back the connection tube (2) of bar (3d) and injection needle (10) and injection needle (10) for connecting conehead;

Described connection tube (2) is the middle tube in through hole, tubule head and the through hole inner bottom part of injecting needle base extra heavy pipe end of connection tube (2) are all arranged to outer conehead and the internal taper hole with identical tapering, the female thread (4a) that the tubule stage casing of connection tube (2) is provided with injecting needle base (4) in large mouth spins and the external screw thread sealed (2a), this tubule is supported toward the part that lower process is thick mutually with syringe (1) osculum end inner plane, the part that the central protrusion of connection tube (2) is thick has two anti-rotation ribs (2b) at least, again toward being arranged with the circular groove (2c) being nested with O RunddichtringO (6), circular groove (2c) bundle joint down forms resistance and gives up the throne (2d),

In described syringe (1) osculum end endoporus, anti-rotation rib (2b) connecting part of connection tube (2) is provided with resistance to ship and resell on another market (1a), the resistance in syringe (1) aperture is shipped and resell on another market anti-rotation rib (2b) interdigitation in opposite directions of (1a) and connection tube (2);

Described injection needle (10): comprise injection needle (9), injecting needle base (4), protective sleeve (8);

Described injecting needle base (4) is a tubular body, be adhesively fixed in injecting needle base (4) tubule end through hole injection needle (9), be configured to the female thread (4a) spun with the external screw thread (2a) of the tubule middle and lower part of connection tube (2) in the through hole of extra heavy pipe end, the arranged outside of injecting needle base (4) tubule end has spline rib (4c);

The interior back-off (1b) for fixed support thin slice (1c) is provided with in described syringe (1); this support slice (1c) is made up of main ring (1c1) and inner periphery mesh sheet (1c2); main ring (1c1) and the described interior back-off (1b) of this support slice (1c) connect and fix, and the inner periphery mesh sheet (1c2) of this support slice (1c) supports the resistance being resisted against the thick section bundle joint place of connection tube (2) and gives up the throne on (2d);

Also comprise collar (1e), the outside of described collar (1e) is provided with Shu Jie (1e1), is provided with the outer back-off (1d) of fixed card ring (1e) in the big opening end of syringe;

Also comprise Compress Spring (7), described Compress Spring (7) is manufactured by metal material, described Compress Spring (7) ring set is pulled back on bar (3d) at conehead, Compress Spring (7) one end be resisted against conehead pull back bar (3d) transverse plane (3d3) on, the other end is resisted against on the bundle pitch plane (3b) of push rod (3) inner chamber.

2. a kind of safety injector as claimed in claim 1,

It is characterized in that: described protective sleeve (8) arranges resistance within it and turns rib (8a), arranges anti-skidding rib (8b) in its appearance; Protective sleeve (8) quilt cover is inserted on injecting needle base (4), and the resistance in protective sleeve (8) turns spline rib (4c) interdigitation in opposite directions of rib (8a) and injecting needle base (4), and described injection needle (9) uses metal material manufacture.

3. as a kind of safety injector in claim 1 or 2 as described in any one,

It is characterized in that: also comprise, make the pull back integral material of bar (3d) of described conehead and select elastomeric material, described conehead bar (3d) of pulling back comprising: conical head (3d1), conehead neck (3d2), transverse plane (3d3) and cydariform sealing ring (3d4), expose push rod (3) masthead ejector sleeve (3a) part when assembling with push rod (3) and be configured to conical head (3d1) structure, described conical head (3d1) is connected with entirety by conehead neck (3d2), cydariform sealing ring (3d4) structure is arranged at the position that conehead neck (3d2) down fixes with the ejector sleeve (3a) of push rod (3).

4. a kind of safety injector as claimed in claim 3,

It is characterized in that: also comprise by hands (5), described in insert syringe (1) inner chamber by hands (5) and push rod (3) the other end utilize grafting, clamping or other known connected modes to fix.

5. a kind of safety injector as claimed in claim 4,

It is characterized in that:

Described, one passage (5c) is set by hands (5) central authorities.

6. a kind of safety injector as claimed in claim 5,

It is characterized in that: described in the one side that connects with push rod (3) by hands (5), and/or surrounding's setting at least 2 shock absorption strips (5a) of passage (5c).

7. a kind of safety injector as claimed in claim 6,

It is characterized in that, described in the another side that connects with push rod (3) by hands (5) tread plate (5b) is set.