CN201267663Y - Automatic retracting type safety syringe - Google Patents

Abstract

The utility model relates to an automatic retraction type safety syringe, which comprises an outer sleeve. A plunger is arranged in the outer sleeve; the front end of the plunger is provided with a rubber plug; the front end of the outer sleeve is provided with an injection needle. The utility model is characterized in that the injection needle is arranged on a needle base; the needle base is arranged at the front end of the outer sleeve; a reset spring is jacketed on the needle base; one end of the spring props against the inner wall of the front end of the outer sleeve; the other end thereof props against the bottom of the needle base; the front end of the outer sleeve is provided with an annular flange; the needle base is positioned on the flange through an outer ring; the outer ring is connected with the needle base through a destructive thin wall; and the bottom end of the needle base is provided with a sharp cone which faces the rubber plug and is used for puncturing the rubber plug. Because of the delicate design, after the preset dose of liquid medicine is transfused completely, the annular thin wall of the needle base can be broken into two parts, ad the needle tube can retract automatically into the outer sleeve due to the elasticity of the spring.

Description

A kind of automatic retracting type safety injector

Technical field

This utility model relates to a kind of disposable medical syringe, concrete relate to a kind of back needle tubing of injecting and can retract to safety injector in the core bar automatically.

Background technology

Injector for medical purpose is a medical apparatus and instruments commonly used, and injector for medical purpose is mainly used in liquid medicine injection or check blood drawing etc.

The employing syringe is finished injection or behind patient's withdraw blood sample, is existed the danger of being stabbed by the entry needle on the syringe for doctor or nurse.Abroad, this phenomenon is referred to as " sticking pin ".This causes the personnel of medical personnel and these Biohazard Wastes of processing often to be exposed to infection and blood diseases associated, under the danger as acquired immune deficiency syndrome (AIDS) (HIV), hepatitis B (HBV), hepatitis C (HCV) etc.

Cause that in addition another one of the main reasons that acquired immune deficiency syndrome (AIDS), hepatitis disease etc. spread is in the mankind: the risk that patient is shared and the repeated use syringe brings.

Report according to World Health Organization (WHO) shows, the whole world suffers the pin evil every year and the patient that infects hepatitis B 800 to 1,600 ten thousand people nearly, and that infects C type hepatitis then has 200 to 4,500,000 people, aids infection 7 to 150,000 people are also arranged, and annually 1300000 people are arranged approximately because of what the pin evil was got killed.The data of U.S. diseases prevention and treatment association shows that the whole America one annual has 1,600,000 acupuncture accidents to take place, and wherein nurse group and blood test personnel acupuncture accident event frequency are the highest, is the doctor secondly again.Under occupational safety Department of Health of the United States Federal (OSHA) estimates that occupation that the whole America has the employee of 5,600,000 medical industries to be exposed to hematologic disease threatens, operation medical sharp device (for example entry needle) such risk arranged per capita.Having 98% nursing staff can experience potential danger, secondly is doctor 70%.The wound that acupuncture causes is also little, but thing followed Qie has fatefulue harm, because used syringe has the blood or the body fluid of sufferer, belong to contaminated utensil, if healthy staff is stabbed by it again, may be infected, the infectious disease of the most normal generation comprises hepatitis B, C type hepatitis, AIDS and syphilis etc.

Research points out that healthy medical personnel are stabbed by the syringe needle that the B liver pollutes, and suitable rehabilitation is not arranged again, thus the probability that infects the B liver 6～30%, the probability that infects the C liver 2～10%, infect the AIDS probability 0.3～2%.The acupuncture incident is the most normal to occur in general ward, and other still comprises operating room, intensive care unit, therapeutic room and emergency room etc.If again with medical act, the action of recovering needle guard is the easiest to be injured by syringe, and the syringe that uses up is not put into the collection box as yet, stabs medical personnel easily yet, so manufacturer focuses on the program of avoiding back lid in the research and development of safety injector more.

Add up according to U.S. Center for Disease Control and Prevention, the acupuncture incident (needle stick) that U.S. medical personnel report to one's superior according to normal procedure every year is about 600,000 person-times, if comprise not report or the wounded that other sharp-pointed medical device stings, should have more than 1,000,000 person-time, and U.S. medical personnel are equivalent to have 20% probability to be wounded by stabbing between 500 to six million peoples.American Nurses' Association thinks that healthy medical personnel are after suffering acupuncture, 2000～3000 dollars of the expenses of each check and prevention infection, if therefore infect hepatitis B or C type hepatitis, annual medical expense 10,000～20,000 dollars, if infected (HIV can cause AIDS) by HIV, then annual medical expense is more up to 20,000～30,000 dollars.About 0.10～0.15 dollar of every market price of conventional syringe, with the annual consumption 50 of the U.S.～6,000,000,000 calculating, the syringe expenditure is 5～900,000,000 dollars, and be subjected to acupuncture, each inspection fee with 3000 dollars of calculating with 600,000 people, medical personnel's expenses for prevention and control promptly reaches 1,800,000,000 dollars, if infected expenditure is higher.In fact the U.S. had 12000 medical care personnel to infect hepatitis B, C type hepatitis or AIDS because of the acupuncture incident in 1 year, wherein people's death surplus in the of 300.Do not contain so be forced to have a holiday or therapeutive medicine expenditure, estimate altogether more than 3,500,000,000 dollars.

The Center for Disease Control (CDC) estimates that the injury from sharp utensil evil of 62-88% can be avoided by using safer medical apparatus and instruments.On November 5th, 1999, occupational safety Department of Health of the United States Federal (OSHA) has issued " Directives2-2 44D ", requires hospital and health agency to provide safe pin apparatus to the worker, so that they avoid being subjected to " sticking pin " injury.November in 2000, the U.S. on the 6th former president Clinton signed " sticking pin safety of The Needlestick Safety and Prevention Act (HR5178) and strick precaution bill ", require hospital and health agency to use safer band pin medical apparatus and instruments, so that they avoid being subjected to " sticking pin (Needle stick) " injury.The appearance of this bill; make increasing medical apparatus and instruments manufacturer begin to close the medical sharp device of casting needle protection; can will hide and protect, avoid syringe needle to expose the accident that causes the personnel of stabbing and catch with the syringe needle of finishing by such protector.

Though the honest use of trying hard to recommend moving disposable safe syringe of some national government; but be not that idea like this is all arranged all over the world; statistics according to World Health Organization (WHO); the ratio that present countries in the world syringe/pin is repeated to use is still high; higher in the majority with developing country of the ratio of wherein reusing, following these areas face sizable infection crisis always.Following table is World Health Organization's statistical result.

The area	Syringe/pin is reused ratio
		Africa, Asia, area, east country, European Region	15％
The Middle East	15％
		India	50％
China	50％
		Nearly area, Sahara Desert, Africa	50％
East Asia, Pacific Islands	50％

More than illustrated at world wide, also had the shared and reusable problem of syringe on a large scale, serious threat people's personal safety.

Now have the disposal medical automatic retraction safety syringe of some different designs, wherein most syringes fails well to come into the market because of various deficiencies.Deficiency common in the prior art has: product structure complexity, poor reliability, cost height, difficult realization batch process etc.

CN101195050A patent application as the Chinese patent bulletin the utility model discloses a kind of disposal medical automatic retraction safety syringe, aims to provide a kind of steady quality, the automatic retractable syringe of producing in enormous quantities with low cost, suitable.It is by sheath, needle tubing, viscose glue, needle stand, sealing ring, spacing ring, plug pin, piston, flexible member, core bar, overcoat is formed, needle tubing is contained in the needle stand, at the front end of needle stand by viscose glue needle tubing, needle stand bonds together and forms the needle stand assembly, between the chamber of the step surface of needle stand and overcoat, overlap upper sealing ring, stop injecting fluid to flow through from this, the side of spacing ring is pressed in and stops sealing ring to move on the side of sealing ring, the spacing ring elastic card withstands on the needle stand step, it stops needle tubing, needle stand moves in use backward, flexible member is contained in intracavity in the core bar, before realizing retraction function, be in extended state, plug pin is contained in the front end of core bar, and the front end of flexible member is held the rear end of plug pin.Just haul the needle tubing assembly when discharging in the elastic stretching of flexible member and enter in core bar, the overcoat and concealed, promptly reach self-destruction, purpose of safety by plug pin.Though this technology can solve the problem of needle retractable within the specific limits, its structure member is various, and the factory technics assembling is complicated, is unfavorable for the production in enormous quantities of factory.

The utility model content

Technical problem to be solved in the utility model is, overcome problems of the prior art, a kind of automatic retracting type safety injector is provided, after injection is used, needle stand fragments into two parts, and syringe needle retracts in the overcoat cavity automatically, to prevent to injure human body, avoid reusing, have the characteristics of disposable, safety, health, easy to use, easy recycling.

In order to address the above problem the technical solution of the utility model is such:

A kind of automatic retracting type safety injector, comprise an overcoat, be provided with plunger in the overcoat, the plunger front end is provided with plug, the overcoat front end also is provided with the injection needle point, it is characterized in that, described needle point is arranged on the needle stand, and described needle stand is arranged on the overcoat front end, also is with back-moving spring on the needle stand, spring one end is against on the overcoat front inner wall, the spring other end is against the needle stand bottom, and described overcoat front end has annular lip, and described needle stand is positioned on the flange by an outer shroud, described outer shroud links to each other by a destructible thin-walled with the needle stand bottom, and described needle stand bottom is provided with towards plug and is used to puncture the pointed cone of plug.

Described overcoat front end also is with the sheath of a protection needle point.

Described plunger front end is the core bar of a hollow, and described plug is placed in the head of core bar, and described plunger back-end cross section is " ten " word structure.

The thickness of described thin-walled is 0.1mm-0.5mm.

The height of described pointed cone is 2mm-3mm.

The front end wall thickness of described plug is 0.2mm-0.6mm.

Length before the described back-moving spring distortion is greater than the total length of needle stand and needle point thereof.

During use, the singlehanded plunger that promotes is squeezed medicinal liquid and penetrates from needle point, when injecting approaching finishing, is enclosed within the plug contact needle stand afterbody pointed cone on the core bar, and pointed cone punctures the thin-walled of plug front end, enters into the anterior endoporus of core bar; The continuation one hand is enforced core bar slightly and is moved forward, this moment, the core bar front end arrived on the platform of needle stand outer shroud, because of outer shroud separates fully with body, at this moment, the spring that overlaps because of needle stand body nose circle cylinder outside string has certain decrement, together with using the contaminated needle point in back moment to be reflected back in the cavity of core bar front end, both realize the automatic retraction of needle point at needle stand body under the effect of its restoring force, also reached the purpose of syringe self-destruction simultaneously.Bounce back moment, can clearly hear promptly to show sound, bounce back successfully.Whole process, operator's hands remains at the rear end of needle point, when pin leaves patient body, do not bounce back, too quickly phenomenon firmly do not occur, after the needle tip retracts, owing to be retracted in the core bar intracavity, so the liquid splash phenomenon can not occur, surpass 3mm from the front end distance after the needle tip retracts, and because the original length of spring and elastic force existence, remain this characteristic, can not lose the function that prevents that needle point from exposing because of the external force effect.And restoring device is incorporated in the product, is not independently parts, need just go effect under overcoat, plunger synergism.Because the needle stand that seals simultaneously reaches retraction function in the situation of fracture,, so satisfy syringe and prevent the requirement that reuses so behind the retraction, syringe is that power effect outside can normally be used.

Beneficial effect, this utility model adopt above technical scheme, are stabbed by accidental needle when having avoided the medical worker to use, and have stopped the reusable phenomenon of syringe simultaneously, have the characteristics of disposable, safety, health, easy to use, easy recycling.

Description of drawings

Describe this utility model in detail below in conjunction with the drawings and specific embodiments;

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is this utility model partly cut-away structural representation;

Fig. 3 is the local structure for amplifying sketch map of Fig. 2;

Fig. 4 is this utility model decomposition texture sketch map;

Fig. 5 is a needle stand perspective view described in the utility model;

Fig. 6 is the three-dimensional cross-sectional view of the described needle stand of utility model;

Fig. 7 is the body of needle stand described in the utility model and the perspective view that outer shroud is separated;

Section of structure when Fig. 8 injects for this utility model;

Fig. 9 is the section of structure after receiving in this utility model syringe needle.

The specific embodiment

For technological means, creation characteristic that this utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth this utility model.

In view of this utility model is the characteristics that combine antiseized pin requirement (safe syringe) and prevent to reuse (self-destruction syringe), must satisfy following the requirement:

Prevent reusing characteristic: should meet the ISO7886-4 regulation

Security feature:

Conformability: safety device should be incorporated in the product

One-handed performance: answer one-hand operation

Operability behind the needle point: hands is positioned at the startup that should finish safety device behind the needle point

Start-up course: safety device should come into force moment

Start timeliness: can not come into force when safety device Ying Zaizhen leaves patient body

Ease for operation: safety device should be simple, and the power of using should not make too much or too quickly.

Whether medicinal liquid splashes: safety device medicinal liquid must not occur and splash when starting.

Start resolvability: should easily differentiate security feature and whether be activated.

The needle point shielding: in a single day security feature is activated, and after security feature came into force, the minimum range that needle point leaves screening arrangement should be not less than 3mm, after security feature comes into force, moved along the screening arrangement periphery with silk flosssilk wadding, can not be hooked by needle point or hook goes out silk flosssilk wadding.

The shielding retentivity: in a single day security feature is activated, and the optional position of hand syringes, should still can be satisfied after hard ground is done fall-down test from the 1m eminence.

Referring to Fig. 1, syringe described in the utility model is a disposable syringe, and profile as shown in the figure; comprise an overcoat 3; be provided with a plunger 4 that advances injection in the overcoat 3, at the overcoat front end sleeve one sheath 6 arranged, sheath 6 is not used to protect needle point contaminated and do not injure user or other people.

Referring to Fig. 2, be provided with retractable needle stand 1 in overcoat 3 inside, needle stand 1 front end is provided with the needle point 2 that is used to inject, and when injection finished, needle stand 1 can retract in the overcoat 3 automatically, avoided exhausted syringe to hurt sb.'s feelings and avoided exhausted syringe to reuse.

Referring to Fig. 3, overcoat 3 interior forward end are provided with outer ring flange 31, needle stand 1 is arranged in the scope of outer ring flange 31 and overcoat 3 front ports, needle stand 1 front end is installed injection needle point 2, needle point 2 stretches out the front port of overcoat 3 before using, needle stand 1 is positioned outer ring flange 31 places, and is with spring 5 on needle stand 31; Spring 5 one ends are against the front port medial wall of overcoat 3, and the other end is against the bottom of needle stand 1.After needle stand 1 location was destroyed, spring 5 meeting drive needle stands 1 and needle point 2 thereof rebounded in the overcoat 3.Be not less than the requirement of 3mm in order to reach retraction back needle point 2 apart from overcoat 3 front ports, the length before spring 5 distortion is greater than the total length of needle stand and needle point thereof.

Referring to figure Fig. 3 and 4, overcoat 3 front ends are with sheath 6, the needle stand 1 that has needle point 2 and spring 5 is arranged on overcoat 3 inside, be provided with the plunger 4 that is used to advance injection in the rear end of needle stand 1, plunger 4 rear end cross sections are " ten " font, the front end of plunger 4 has the core bar 41 of a hollow, and the front end of core bar 41 is with the plug 42 of sealing usefulness.The front end wall thickness of plug 42 is 0.2mm-0.6mm, and the front end wall thickness of general plug 2 is 0.4mm, can reach certain intensity like this, punctures than being easier to again.

As Fig. 5, Fig. 6, shown in Figure 7, the bottom of needle stand 1 is positioned outer ring flange 31 places by an outer shroud 11, outer shroud 11 is connected by thin-walled 13 with the bottom of needle stand 1; thin-walled 13 is destructible thin-walled; the thickness of thin-walled is 0.1mm-0.5mm; be generally 0.3mm, and needle stand 1 inside has pin hole 122, and pin hole 122 is communicated with needle point 2.Described spring 5 is placed in needle stand 1 outside.Be provided with a pointed cone 121 in the rear end of needle stand 1, pointed cone 121 is used to puncture the plug 2 in the overcoat.Pointed cone 121 highly is 2mm～3mm.

Referring to Fig. 8 and Fig. 9:

During assembling, at first at needle stand body 12 nose circle cylinders outside cover one spring 5, both are positioned at the inner chamber front end of overcoat 3 together by the annular lip on the outer casing inner wall 31 then, so the drift of spring 5 is greater than the cylinder length of needle stand body 12 front ends.Make the spring 5 after fixing have certain decrement.

When injection is used, promote plunger 4, medicinal liquid is squeezed penetrates from needle point 2.When injecting approaching finishing, be enclosed within the plug 42 contact pin seat bodies 12 afterbody pointed cones 121 on the core bar 41, at this moment, pointed cone 121 punctures the thin-walled of plug 42 front ends, enters into core bar 41 anterior inner chambers; Continuing to promote core bar 41 moves forward, arrive on the platform of needle stand outer shroud 11 up to core bar 41 front ends, because of outer shroud 11 and needle stand body 12 connecting places are provided with groove 13, make that continuous position wall thickness is very thin, one enforce core bar 41 slightly, needle stand body 12 just ruptures from the position that is connected fully with outer shroud 11, needle stand 1 is separated into body 12 and outer shroud 11 two parts, at this moment, the spring that is connected in needle stand body 12 nose circle cylinders outside because of cover has certain decrement, together with using the contaminated needle point 2 in back to be sprung into rapidly in the cavity of core bar 41 front end hollows, finish whole injection process at needle stand body 12 under the effect of its restoring force.

Compared with prior art, this utility model adopts above technical scheme, stabbed by accidental needle when having avoided the medical worker to use, stopped the reusable phenomenon of syringe simultaneously, have the characteristics of disposable, safety, health, easy to use, easy recycling.

More than show and described ultimate principle of the present utility model, principal character and advantage of the present utility model.The technical staff of the industry should understand; this utility model is not restricted to the described embodiments; that describes in the foregoing description and the description just illustrates principle of the present utility model; this utility model also has various changes and modifications under the prerequisite that does not break away from this utility model spirit and scope, and these changes and improvements all fall in claimed this utility model scope.The claimed scope of this utility model is defined by appending claims and equivalent thereof.

Claims (7)

1, a kind of automatic retracting type safety injector, comprise an overcoat, be provided with plunger in the overcoat, the plunger front end is provided with plug, the overcoat front end also is provided with the injection needle point, it is characterized in that, described needle point is arranged on the needle stand, and described needle stand is arranged on the overcoat front end, also is with back-moving spring on the needle stand, spring one end is against on the overcoat front inner wall, the spring other end is against the needle stand bottom, and described overcoat front end has annular lip, and described needle stand is positioned on the flange by an outer shroud, described outer shroud links to each other by a destructible thin-walled with the needle stand bottom, and described needle stand bottom is provided with towards plug and is used to puncture the pointed cone of plug.

2, a kind of automatic retracting type safety injector according to claim 1 is characterized in that, described overcoat front end also is with the sheath of a protection needle point.

3, a kind of automatic retracting type safety injector according to claim 1 is characterized in that, described plunger front end is the core bar of a hollow, and described plug is placed in the head of core bar, and described plunger back-end cross section is " ten " word structure.

4, a kind of automatic retracting type safety injector according to claim 1 is characterized in that, the thickness of described thin-walled is 0.1mm-0.5mm.

5, a kind of automatic retracting type safety injector according to claim 1 is characterized in that, the height of described pointed cone is 2mm-3mm.

6, a kind of automatic retracting type safety injector according to claim 1 is characterized in that, the front end wall thickness of described plug is 0.2mm-0.6mm.

7, a kind of automatic retracting type safety injector according to claim 1 is characterized in that, the length before the described back-moving spring distortion is greater than the total length of needle stand and needle point thereof.

Images