CN202052160U - Disposable safe syringe capable of retracting automatically with replaceable syringe needle - Google Patents

Abstract

A disposable safe syringe capable of retracting automatically with a replaceable syringe needle according to the utility model relates to the technical field of a medical instrument. The disposable safe syringe comprises an outer cover (1) and a core rod (2), and furthermore comprises a drug preparation syringe needle (3) and an injection syringe needle (4). The drug preparation syringe needle is integrally formed by plastic material. The injection needle (4) can be replaced according to use requirement so as to prevent syringe needle deformation, reduced fineness and sharpness because of drug dissolving, thereby preventing adverse effect for injection on human body. According to the utility model, the traditional operation habit is basically not changed so as to obtain high convenience in use and reliable function. After the injection is finished, the injection syringe needle can retract for hiding through an automatic retraction mechanism so as to ensure no accidental damage of medical personnel and patient by a polluted syringe needle. After the injection is finished, the core rod (2) is blocked by a blocking basket (1d) and can not be drawn out, and therefore the used syringe can be not used repeatedly for performing injection, thereby realizing genuine one-time use of the syringe and preventing cross propagation of blood-borne disease. According to the utility model, as a compression spring which is compressed is sleeved on a rebound movable rod, the structure design is more reasonable, the disposable safe syringe is more suitable for automatic assembling of a production streamline. The disposable safe syringe further has the following advantages: high quality, high qualified rate and reduced cost.

Description

A kind of syringe needle interchangeable and can bounce back automatically only can expendable safety injector

Technical field

The present invention relates to technical field of medical instruments, particularly relate to a kind of syringe needle interchangeable and can bounce back automatically only can expendable safety injector.

Background technology

At present, when undergoing preventive vaccination, treatment disease liquid medicine injection and health and epidemic prevention use disposable sterilized syringe, to controlling iatrogenic infectious disease, preventing that aspect such as cross infection from having played positive role.But, the disposable sterilized syringe of prior art--disposable sterilized syringe that comprises various ways such as the manual haulback type of type self-destroyed, syringe needle, syringe needle automatic retracting type--is because the imperfection of design and structure, lack some essential functions, can not satisfy the needs in the safe handling fully.For example, 1. the disposable sterilized syringe of prior art needs back cover entry needle protective sleeve later because product with keeping intact substantially later, is used, and this process very easily produces the unexpected injury that medical personnel are polluted needle point; 2. though disposable sterilized syringe is named and is " disposable sterilized syringe ", but most products can not reach only expendable purpose on structure, the overwhelming majority can both reuse, say that just " disposable use " only is will be from managing the strict demand of getting on, lawless person mercenary will name to " disposable use " asepsis injector repeats repeatedly to use and reclaim use, will cause the serious consequence of cross infection; 3. when using dry powder injection preparation liquid medicine injection, after in the medicine powder container of sealing, annotating solution, injection needle has been kept away unavoidable generation distortion and the fineness and the sharpness of syringe needle has been exerted an influence, from the strict sense, the entry needle of medicine bottle plug of being used to during preparating liquid to puncture must not be used further to human body is injected, and, have some countries to have the exhausted entry needle of preparating liquid puncture medicine bottle plug can not be used further to human body is injected this Compulsory Feature on the one hand.And the safety injector that the disposable sterilized syringe of prior art, especially syringe needle can bounce back automatically, the general function that does not all have to change syringe needle; It is 4. current that oneself has hospital to bring into use the automatic retractable safety injector of syringe needle, comprise patent of invention that the author applies in earlier stage " the interchangeable and disposible safety syringe that can bounce back automatically of 200910164711.1 1 kinds of syringe needles " etc., most of this syringes all are to adopt 1. to press the compression ring spring that shields to be enclosed within the mode of needle stand, the drawback of this mode is that the dynamics F1 that tightly blocks needle stand must pull out needle force F3's and (F1＞F2+F3) after the potential tension force F2 of screen compression spring and the injection greater than pressing, so certainly will bigger raising to the product required precision of part processing in addition, just can reach the influence that the power of resisting injection needle restoring is not weakened; 2. the mode of tightly blocking needle stand is entry needle fixedly, the drawback of this mode has three, one. higher to other requirement on machining accuracy of part in process of production, two. the influence that product is expanded with heat and contract with cold by machining accuracy and climatic environment, its power of resisting injection needle restoring also has the influence that weakens more greatly, three. especially exhausted syringe is when post processing, and its entry needle and other metal device (compression spring) are difficult to take out and classification is destroyed.

Summary of the invention

Can (comprise manually) automatically at the above disposable sterilized injector and syringe needle the objective of the invention is to the deficiency of the safety injector of retraction, propose a kind of syringe needle interchangeable and can bounce back automatically only can expendable safety injector.

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

A kind of syringe needle interchangeable and can bounce back automatically only can expendable safety injector, comprise overcoat and core bar, described core bar inserts its inner chamber from the overcoat big opening end, also comprises make up a prescription syringe needle and injection needle; Described core bar is a core structure, the core bar inner chamber is provided with snap ring, and resilience bar alive is set in the masthead open pore of core bar, and the compression ring spring is enclosed within on the resilience bar alive, compression spring one end is resisted against resilience bar alive bar alive plane, and the other end is resisted against on the bundle pitch plane of core bar;

Described resilience bar alive exposes the core bar masthead and partly is provided with the elasticity buckling device, the middle part of resilience bar alive is provided with the card joint, during assembling, the snap ring that the card joint at resilience bar alive middle part is crossed the setting of core bar inner chamber is fixed, the compression ring spring is enclosed within on the resilience bar alive and is pressed screen, and resilience this moment bar alive is in the compression spring and is pressed among the potential tension force of screen;

Described injection needle comprises injection needle, injecting needle base, the needle stand cover, the O RunddichtringO, with needle stand retaining medicated cap, described injecting needle base is a tubular cylinder, it is characterized in that its tube chamber is designed to into young at butt end, the container cavity of the energy clamping that internal volume is big, the planar outer rim of the butt end of described injecting needle base is designed to the protruding dish of circular arc, described injection needle is fixed in the tube chamber of the thin end of injecting needle base, described needle stand cover is a hollow circular cylinder, it is characterized in that its inner chamber lower end inwardly is provided with the circular arc flange, described injecting needle base places needle stand cover inner chamber, the sealing of one O RunddichtringO is set between the circular arc flange of protruding dish of the circular arc of the butt end of described injecting needle base and needle stand cover, described needle stand retaining medicated cap is fixedly installed on the needle stand set upper side, thin end part of injecting needle base is passed needle stand retaining medicated cap, the thick needle stand retaining medicated cap inner face of partly replacing in the injecting needle base, injecting needle base is fixed;

A kind of as previously discussed syringe needle interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that the outside of described card basket is provided with Shu Jie, the big opening end inner edge of overcoat is provided with back-off device and makes it to firmly fix the card basket.

A kind of as previously discussed syringe needle interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that, other end utilization grafting, clamping or other modes that described core bar inserts the overcoat inner chamber are provided with one and press hands, from the bundle pitch plane of core bar to a venthole is set by hands.

A kind of as previously discussed syringe needle interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that, the another port that described overcoat is inserted by core bar is provided with female thread and conical bore, described outer rim of making up a prescription needle stand and needle stand cover is respectively equipped with the external screw thread and the frustum of a cone, when needle stand and the needle stand cover that makes up a prescription cooperates respectively with overcoat, screw in the conical bore that the frustum of a cone that make up a prescription needle stand and needle stand are overlapped is resisted against overcoat respectively by internal and external screw thread and to be sealing state.

A kind of as previously discussed syringe needle interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that, be provided with ratchet in the retaining between the female thread of the another port that described overcoat is inserted by core bar and the conical bore, be provided with the outer ratchet of the corresponding retaining of ratchet in the retaining that is provided with overcoat between the external screw thread of the outer rim setting of described needle stand cover and the frustum of a cone.

A kind of as previously discussed syringe needle interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that the described needle stand periphery of making up a prescription is provided with anti-skidding rib or/and be set as two butterfly wings or/and be set as the annular knurl stricture of vagina.

A kind of as previously discussed syringe needle interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that, also comprise the entry needle sheath, be respectively equipped with corresponding internal spline and outer teeth groove between described entry needle sheath and the needle stand cover, described entry needle sheath is enclosed within on the injection needle.

A kind of as previously discussed syringe needle interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that, described entry needle sheath outer rim also be provided with anti-skidding rib or/and the butterfly wing or/and the annular knurl stricture of vagina.

A kind of as previously discussed syringe needle interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that, described needle stand retaining medicated cap by clamping, spin or alternate manner is fixedly installed on the needle stand set upper side.

A kind of as previously discussed syringe needle interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that, described core bar, injecting needle base, needle stand cover, needle stand retaining medicated cap, entry needle sheath, adopt plastic material, described overcoat adopts the medical grade transparent plastic material to make, and the needle tubing that makes up a prescription of the described syringe needle that makes up a prescription adopts medical grade non-toxic rigid plastic material one-body molded with the needle stand that makes up a prescription;

A kind of syringe needle of the present invention interchangeable and can bounce back automatically only can following beneficial effect be arranged expendable safety injector compared with prior art:

1. the present invention 1. will compress spring and press screen to be arranged on elasticity in the core bar to live on the bar, change the traditional compression ring spring that will press screen and be enclosed within way on the needle stand-promptly the removed potential tension force of compression spring on injecting needle base of pressing screen, increased the power of resisting injection needle restoring, improved security of products, have good practical value and economic worth, 2. make up a prescription needle tubing and the needle stand that makes up a prescription of syringe needle of making up a prescription adopts the medical grade non-toxic rigid plastic one-body molded, traditional plastics make up a prescription needle stand and rustless steel injection needle bonding mode have been changed, save material cost and artificial, reduced the production cost of integral product;

2. do not change traditional operating habit when the present invention uses substantially, easy-to-use, reliable effect, entry needle still can bounce back automatically by automatic cam mechanism and hide when injection was finished, guarantee that medical personnel avoid being polluted the unexpected injury of needle point, thereby one. saved a large amount of because of polluting the medical expenses that the needle point injury brings, two. avoided medical personnel to injure catch suffered human body misery and moral injury because of needle point, thereby a large amount of medical expenses that catch and bring because of needle point injury medical worker have been saved, and because the present invention 1. is stuck when injection finishes by the fixed card basket of overcoat big opening end at core bar arranged outside chuck, 2. entry needle injection finishing back bounces back automatically and can't repeat to install and use, make used syringe can't repeat injection from the structural design of this two aspect, realize syringe disposable use truly, thoroughly stop, avoided the cross infection of blood borne disease, particularly will compress spring is arranged in the core bar, syringe uses entry needle and compression spring is separated rapidly with working of plastics, syringe uses post processing work later extremely simple, and this two aspect has shown that this patent has fabulous social benefit;

3. the originality of structural design of the present invention, having potential tensile compression ring spring after will pressing also is located on the resilience bar alive, having changed syringe needle automatic retraction safety syringe in the market generally adopts and will compress spring and be arranged on way on the needle stand, the power of resisting injection needle restoring is increased and safer, and this structure is corresponding lower to other part processing request of product, the requirement of product assembling was also more simple and convenient, because more reasonable structural design of the present invention, be more suitable for assembling production automatically in production line, both improved output, guaranteed product quality again, because the qualification rate of product improves, therefore, the raising of output, the reduction of product cost can produce better economic benefit;

4. in sum, because a kind of exchangeable needle of the present invention and can bounce back automatically only can have good practical value by expendable safety injector, fabulous social benefit, better economic benefit, therefore, be a kind of that be worth applying in the whole world, also very likely become the disposible safety syringe that updates in the era development process.

Description of drawings

Fig. 1 is the make up a prescription structure cutaway view of syringe needle of anti-skidding sour jujube bar that has of the present invention;

Fig. 2 is the structure cutaway view of finishing after injection needle is changed of the present invention;

Fig. 3 finishes injection needle retracted state structure cutaway view behind the injecting liquid drug for the present invention;

Fig. 4 is the one-body molded syringe needle structure for amplifying cutaway view that makes up a prescription of the present invention;

Fig. 5 is the combination injection needle structure for amplifying cutaway view that bounces back of the present invention;

Fig. 6 is a needle stand nested structure cutaway view of the present invention;

Fig. 7 is an injecting needle base structure cutaway view of the present invention;

Fig. 8 is a Tip protection nested structure cutaway view of the present invention;

Fig. 9 is a resilience of the present invention bar structure alive cutaway view;

Figure 10 is a jacket structure cutaway view of the present invention;

Figure 11 is a card basket structure cutaway view of the present invention;

Figure 12 is a core bar combinative structure cutaway view of the present invention;

In the above accompanying drawing: the 1-overcoat; The 1a-conical bore; Ratchet in the 1b-retaining; 1c-overcoat female thread; 1d-card basket; 1d1-restraints joint; The 1e-big opening end; The 1e1-back-off device; The 2-core bar; The 2a-inner chamber; The 2a1-snap ring; 2a2-restraints pitch plane; The 2a3-masthead; 2b-resilience bar alive; 2b1-elasticity buckling device; 2b2-card joint; 2b3-bar alive plane; The 2c-chuck; 2d-compresses spring; 2e-presses hands; The 2e1-pore; The 3-syringe needle that makes up a prescription; The 3a-needle tubing that makes up a prescription; The 3a1-epiconus; 3a2-epiconus side opening; The 3b-needle stand that makes up a prescription; The 3b1-frustum of a cone; The 3b2-anti-skidding rib of syringe needle that makes up a prescription; The 3b3-syringe needle external screw thread that makes up a prescription; 3c-dispensing needle sheath; The 4-injection needle; The 4a-injection needle; The 4b-injecting needle base; 4b1-carefully holds; The 4b2-container cavity; The 4b3-butt end; The protruding dish of 4b4-circular arc; 4b5-butt end plane; 4c-needle stand cover; 4c1-circular arc flange, the 4c2-frustum of a cone; The outer ratchet of 4c3-retaining; 4c4-injection needle external screw thread; 4c5-water jacket tooth; 4d-needle stand retaining medicated cap; The 4e-O RunddichtringO; 4f-entry needle sheath; 4f1-inside groove tooth; The anti-skidding rib of 4f2-entry needle sheath; 5-injecting needle base sheath; 5a-injecting needle base sheath female thread.

The specific embodiment

Embodiment 1:

A kind of syringe needle of the present invention interchangeable and can bounce back automatically only can expendable safety injector.As Fig. 1～shown in Figure 4, comprise overcoat 1 and core bar 2, described core bar 2 inserts its inner chamber from the big opening end 1e of overcoat 1, it is characterized in that, also comprises make up a prescription syringe needle 3 and injection needle 4.The described syringe needle 3 that makes up a prescription comprises make up a prescription the needle tubing 3a and the needle stand 3b that makes up a prescription, make up a prescription the needle tubing 3a and the needle stand 3b employing medical grade non-toxic plastic integral molded plastic molding of making up a prescription of the described syringe needle 3 that makes up a prescription.Described injection needle 4 its members comprise injection needle 4a, injecting needle base 4b, needle stand cover 4c, O RunddichtringO 4e and needle stand retaining medicated cap 4f.Described injecting needle base 4b is a tubular cylinder, and described injection needle 4a is fixed on injecting needle base 4b and carefully holds in the endoporus of 4b1.Described needle stand cover 4c is a hollow cylinder, and inwardly is provided with circular arc flange 4c1 in the lower end of inwall, fixes an O RunddichtringO 4f at the circular arc flange 4c1 place of described needle stand cover 4c inwall lower end.The butt end 4b3 of described injecting needle base 4b places O RunddichtringO 4e inner chamber, the mutual pocket of the circular arc flange 4c1 top O RunddichtringO 4e of the circular arc of injecting needle base 4b butt end 4b3 outer rim protruding dish 4b4 and needle stand cover 4c inwall lower end, make sealing and fixing between injecting needle base 4b and the needle stand cover 4c, front end at described needle stand cover 4c, by clamping, spin or other modes fixedly install needle stand retaining medicated cap 4d, the thin end 4b1 of described injection needle 4a and injecting needle base 4b partly stretches out needle stand retaining medicated cap 4d, and thick part is pressed by the inner face of needle stand retaining medicated cap 4d and buckled and fix among the described injecting needle base 4b.The other end that described overcoat 1 is inserted by core bar 2 is provided with female thread 1c, and described syringe needle 3 and the injection needle 4 of making up a prescription is respectively equipped with external screw thread 3b3 and 4c4.In actual applications, according to using needs, can easily described syringe needle 3 or the injection needle 4 of making up a prescription fixedly be spun with overcoat 1 respectively by helicitic texture.Owing to be provided with the conical bore 1a of aperture convergent at the front end of overcoat 1, needle stand 3b and needle stand cover 4c rear end is respectively equipped with frustum of a cone 3b1,4c2 making up a prescription, make up a prescription syringe needle 3 or injection needle 4 when fixedly spinning with overcoat 2 respectively, their frustum of a cone 3b1,4c2 position are resisted against respectively in the conical bore 1a, implement sealing.If conical bore 1a is different taperings with frustum of a cone 3b1 or 4c2, then the tapering of conical bore 1a should be greater than the tapering of frustum of a cone 3b1 or 4c2, and is comparatively favourable to their cooperation and sealing.If conical bore 1a is made as identical tapering with frustum of a cone 3b1 or 4c2, the contact surface between them is big, and sealing effectiveness is better.During use; the syringe that the syringe needle 3 that makes up a prescription is housed extracts molten medicine solvent injection powder bottle makes it dissolving; screw off the syringe needle 3 that makes up a prescription behind the syringe pumpback medicinal liquid; injection needle 4 on the spinning; (ratchet 1b closes and allots living acting in the retaining of outer ratchet 4c3 of the retaining of injection needle 4 and overcoat 1 at this moment; cause injection needle 4 can not despining to withdraw from); when the syringe that is installed with injection needle 4 when use carries out liquid medicine injection; core bar 2 is injected the medicinal liquid in the overcoat 1 when will finish; (it is prior art that front end suit one piston of core bar 2 seals; do not elaborate at this); the elasticity buckling device 2b1 of resilience in core bar 2 masthead 2a3 endoporus bar 2b alive replaces among the container cavity 4b2 that enters needle stand 4b butt end 4b3 and is fixed; when core bar 2 continues to advance; resilience is lived bar 2b by the anti-top power of injecting needle base 4b gradually in the cavity 2a of top shift-in core bar 2; resilience is lived bar 2b gradually by in the inner chamber 2a of top shift-in core bar 2 time; the masthead 2a3 of core bar 2 exposes gradually; in the gap of the circular arc flange 4c1 of butt end 4b3 that exposure portion injects injecting needle base 4b along with core bar 2 advances and needle stand cover 4c; direct reach the protruding dish of circular arc 4b4 that top O RunddichtringO 4e crossed injecting needle base 4b butt end 4b3 outer rim and enter the inner chamber of needle stand cover 4c; medicinal liquid was injected and was finished this moment; injecting needle base 4b loses the fixing of O RunddichtringO 4e; continue in the progradation at core bar 2 simultaneously; resilience bar 2b alive also constantly is being pushed the inner chamber 2a of shift-in core bar 2; cross snap ring 2a1 in the core bar 2 inner chamber 2a until the live card joint 2b2 of bar 2b of resilience; resilience is lived bar 2b under compression spring 2d relaxes tensile effect; resilience bar 2b alive connects injecting needle base 4b (comprising injection needle 4a) and resilience in the inner chamber 2a of trend core bar 2 together; the diastole power of compression spring 2d of design should be enough to make injection needle 4a (comprising injecting needle base 4b) speed away human injection position and whole resilience automatically; fall into and finish injection in the core bar 2 inner chamber 2a; finish to return cover injection needle protective sleeve 5 after the injection; simultaneously; when injecting liquid drug finishes; core bar 2 is also shifted the bottom of overcoat 1 simultaneously onto; at this moment the chuck 2c of core bar 2 also crosses the card basket 1d of the big opening end 1e that is arranged on overcoat 1 simultaneously; after finishing injection; core bar 2 can't pumpback because of the chuck 2c that blocked core bar 2 by card basket 1d; the unexpected injury that the one side medical personnel have avoided being polluted needle point; design of the present invention on the other hand makes used syringe be difficult to dismounting again and stops product and reuse, and guarantees the disposable use that the present invention is real.

Embodiment 2:

Present embodiment is similar substantially to embodiment 1, and as shown in Figure 4, difference is that syringe of the present invention also comprises dispensing needle sheath 3c, and kink is on the needle stand 3b that makes up a prescription, and needle tubing 3a shields to making up a prescription; The needle stand 3b that makes up a prescription is provided with many anti-skidding rib 3b2 (or claiming convex ridge) and/or is set as two butterfly wing (not shown)s and/or surface knurling (not shown), is convenient to grip and spin.

Embodiment 3

Present embodiment is similar substantially to embodiment 1, and as shown in Figure 7, difference is that syringe of the present invention also comprises entry needle sheath 4f, and kink is protected injection needle 4a at the front end of injection needle 4.Be respectively equipped with corresponding inside groove tooth 4f1 and water jacket tooth 4c5 at entry needle sheath 4f inner edge and needle stand cover 4c outer rim, when entry needle sheath 4f and needle stand cover 4c socket-connect, their inside groove tooth 4f1 and water jacket tooth 4c5 interlaced (inserting), entry needle sheath 4f outer rim also is provided with many anti-skidding rib 4f2 (or claiming convex ridge) and/or is set as two butterfly wing (not shown)s and/or surface knurling (not shown), is convenient to the installation that spins of injection needle 4.Injection needle 4 do not spin be installed on the overcoat 1 before, be provided with injecting needle base sheath female thread 5a with injecting needle base sheath 5 inner edges, injecting needle base sheath 5 rotation sets are cleaned protection on needle stand cover 4c.

Embodiment 4

Present embodiment is similar substantially to embodiment 3, shown in Fig. 5 and Fig. 6,8, difference is, the present invention also comprises the stopping device of injection needle: the inner edge at overcoat 1 is provided with ratchet 1b in the retaining, and needle stand cover 4c is provided with the outer ratchet 4c3 of corresponding retaining, when injection needle 4 screws in overcoats 1, because the effect of ratchet 1b and the outer ratchet 4c3 of retaining in the retaining, injection needle 4 can only unidirectional precession, and oppositely can't screw out.Injection needle stopping device of the present invention can prevent to reuse exhausted discarded syringe, or be used again after being disassembled.

Embodiment 5

Present embodiment is similar substantially to embodiment 1, shown in Fig. 1 and Fig. 2,3, difference is, the present invention comprises that also core bar is to establish a venthole device by hands: other end utilization grafting, clamping or other modes of inserting overcoats 1 at core bar 2 are provided with one and press hands 2e, from the bundle pitch plane 2a2 of core bar 2 to a venthole 2e1 is set by hands 2e, core bar of the present invention can prevent that to establish a venthole device by hands product from standing to need negative pressure when vacuum is sterilized, make the inside and outside air pressure balance of resilience bar card joint alive, unlikely resilience bar alive moves because of negative pressure.

The foregoing description is as an illustration example only, is not the qualification that the present invention is done, and the present invention can also adopt other modes, step to implement, and does not give unnecessary details one by one at this.In every case adopt the technical scheme that is equal to replacement or equivalent transformation formation, all belong to the protection domain of requirement of the present invention.

Claims (9)

1. A syringe needle interchangeable and can bounce back automatically only can expendable safety injector, comprise overcoat (1) and core bar (2), described core bar (2) inserts its inner chamber from overcoat (1) big opening end (1e), also comprise syringe needle that makes up a prescription (3) and injection needle (4), described core bar (2) is a core structure, core bar (2) inner chamber (2a) is provided with snap ring (2a1), one resilience bar (2b) alive is set in the masthead of core bar (2) (2a 3) open pore, compression spring (2d) ring set is on bar (2b) is lived in resilience, compression spring (2d) end is resisted against resilience bar alive (2b) bar plane (2b3) alive, the other end is resisted against on the bundle pitch plane (2a2) of core bar (2), described resilience bar alive (2b) exposes core bar (2) masthead (2a 3) part and is provided with elasticity buckling device (2b1), the middle part of resilience bar alive (2b) is provided with card joint (2b2), during assembling, the snap ring (2a1) that the card joint (2b2) at resilience bar alive (2b) middle part is crossed core bar (2) inner chamber (2a) setting is fixed, and compression spring (2d) quilt of ring set on bar (2b) is lived in resilience pressed screen.
2. According to the described a kind of syringe needle of claim 1 interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that, described injection needle (4) comprises injection needle (4a), injecting needle base (4b), needle stand cover (4c), O RunddichtringO (4e) and needle stand retaining medicated cap (4d), described injecting needle base (4b) is a tubular cylinder, it is characterized in that its tube chamber butt end (4b3) is designed to the container cavity (4b2) into the big energy clamping of young internal volume, the outer rim of the butt end (4b3) of described injecting needle base (4b) is designed to the protruding dish of circular arc (4b4), described injection needle (4a) is fixed in the tube chamber of the thin end of injecting needle base (4b) (4b1), described needle stand cover (4c) is a hollow circular cylinder, it is characterized in that its inner chamber lower end inwardly is provided with circular arc flange (4c1), described injecting needle base (4b) places needle stand cover (4c) inner chamber, the sealing of one O RunddichtringO (4e) is set between the protruding dish of circular arc (4b4) of the butt end (4b3) of described injecting needle base (4b) and the circular arc flange (4c1) of needle stand cover (4c), described needle stand retaining medicated cap (4d) is fixedly installed on needle stand cover (4c) upper end, and the thin end (4b1) of injecting needle base (4b) partly passes needle stand retaining medicated cap (4d) and is fixed.
3. According to the described a kind of syringe needle of claim 1 interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that, described overcoat (1) is provided with female thread (1c) and conical bore (1a) by the another port that core bar (2) inserts, described needle stand that makes up a prescription (3b) and the needle stand cover (4c) that injecting needle base (4b) is housed are respectively equipped with the external screw thread (4c4) and the frustum of a cone (4c2), the needle stand cover (4c) that makes up a prescription needle stand (3b) or injecting needle base (4b) is housed and overcoat (1) are when cooperating respectively, by interior, external screw thread screws the frustum of a cone (3b1) of the needle stand cover (4c) that makes the needle stand that makes up a prescription (3b) and injecting needle base (4b) is housed, (4c2) be resisted against respectively in the conical bore (1a) of overcoat (1) and be sealing state.
4. According to the described a kind of syringe needle of claim 1 interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that the outside of described card basket is provided with Shu Jie, the big opening end inner edge of overcoat is provided with back-off device and makes it to firmly fix the card basket.
5. According to the described a kind of syringe needle of claim 1 interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that, described core bar (2) inserts method setting such as the other end utilization grafting, clamping of overcoat (1) inner chamber and fixes one and press hands (2e), from the bundle pitch plane (2a2) of core bar (2) to a venthole (2e1) being set by hands (2e).
6. According to the described a kind of syringe needle of claim 1 interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that, also comprise entry needle sheath (4f), be respectively equipped with corresponding internal spline (4f1) and outer teeth groove (4c5) between described entry needle sheath (4f) and the needle stand cover (4c), described entry needle sheath (4f) is enclosed within on the injection needle (4).
7. According to the described a kind of syringe needle of claim 1 interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that, described entry needle sheath (4f) outer rim also be provided with anti-skidding rib (4f2) or/and the butterfly wing or/and the annular knurl stricture of vagina.
8. According to the described a kind of syringe needle of claim 1 interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that, conical bore (1a) inner edge of described overcoat (1) is provided with ratchet (1b) in the retaining, and the outer rim of described needle stand cover (4c) is provided with the outer ratchet (4c3) of the corresponding retaining of ratchet (1b) in the retaining that is provided with overcoat (1) circular hole inner edge.
9. According to the described a kind of syringe needle of claim 1 interchangeable and can bounce back automatically only can expendable safety injector, it is characterized in that, described core bar (2), injecting needle base (4b), needle stand cover (4c), needle stand retaining medicated cap (4d), entry needle sheath (4f), adopt plastic material, described overcoat (1) adopts the medical grade transparent plastic material to make, and the needle tubing that makes up a prescription (3a) of the described syringe needle that makes up a prescription (3) and the needle stand that makes up a prescription (3b) adopt medical grade non-toxic rigid plastic material one-body molded.

Images