CN2258071Y - Needle retractable safety syringe - Google Patents

Abstract

The utility model relates to a needle retractable safety syringe which comprises a medicine cylinder assembly, a needle assembly and a soft release element, wherein, the medicine cylinder assembly is composed of an outer cylinder, a hollow push rod and a rubber plunger device which is provided with an easily-broken enclosed element, the needle assembly comprises a casing which is fixed on the top end of the outer cylinder through a replaceable structure and a needle, a needle holder and an elastic element which are buckled on the casing through a releasable structure. After injection is completed, the hollow push rod is continuously pushed upwards for a short distance, the soft release element is pushed to be moved, the needle and the needle holder are forced to be separated from the casing by the soft release element, the needle holder and the needle are moved downwards by the elastic element, and the easily-broken enclosed element of the rubber plunger device falls in the hollow push rod after destroyed, so that accidental stuck injury events caused by needles can be avoided after the utility model is used.

Description

The retractable safety injector of entry needle

This utility model relates to that a kind of health hygienic field is imported medium in the body or takes out the apparatus of medium in the body, particularly relates to a kind ofly can freely selecting the entry needle of required size for use and entry needle being disappeared fully in the retractable safety injector of its hollow ram knockdown entry needle in inside.

Hypodermic syringe can use for various various objectives, and for example, syringe can be via the method for unicuspid head hypodermic needle with tradition injection or intravenous injection (I.V. injection), so as to medicinal liquid being flow into patient's body or intravenous; Moreover syringe also can be used in the vacuum bloodletting, utilizes two tip hypodermic needles with patient's blood sample continuously in each vacuum tube of suction.

Hypodermic syringe after the use needed earlier entry needle to be fractureed or damage before abandoning sometimes, was repeated to use to prevent it.Medical personnel or Biohazard Waste treatment people may unexpectedly be stabbed by entry needle especially easily because of carelessness when the entry needle of handling or damaging after using, and then the PI body fluid sexually transmitted disease of life-threatening such as AIDS or hepatitis safety for example.Based on protection and eliminate the user of service and avoid the fear that has an accident and infect, the safety injector that can avoid anyone accident to be stabbed by entry needle then day by day comes into one's own; Simultaneously, use or before it uses or after using, preferably do not contact entry needle, to reduce between medical personnel, Biohazard Waste treatment people and patient the probability of transmission AIDS virus, hepatitis and other body fluid sexually transmitted disease mutually near the personnel of entry needle.

In order to solve the aforesaid drawbacks, promptly have some safety injectors in response to and give birth to, it has the function that the entry needle accident after the personnel that can prevent are used stabs and avoid syringe to be repeated to use, and widely disseminates the existing distinguished outstanding contribution in aspect for the entry needle of avoiding body fluid sexually transmitted diseases such as AIDS or hepatitis after use; But the syringe of this kind improvement must be combined into one with entry needle and urceolus with inseparable frame mode during fabrication in advance, in other words, the syringe of this kind improvement is after finishing manufacturing, and the outer cylinder size of every syringe and the entry needle count that is fixed thereon can't change; This shortcoming causes its very big inconvenience when reality is used.General medical personnel must select the urceolus of suitable bore and the entry needle of suitable count for use according to medicament kind, injection dose and injection site before injecting; For example the urceolus of 5cc capacity can be equipped with No. 1 to No. 14 entry needle, and the urceolus of 10cc capacity also may be equipped with No. 1 to No. 14 entry needle.This shows that the count of entry needle and the bore of urceolus have hundreds of different assembly sizes at least when reality is used.Therefore, urceolus in the conventional syringe and entry needle all are after making respectively, match assembling voluntarily by medical personnel again.Though the syringe of this kind improvement and other known safety injectors can reach its purpose that prevents that the entry needle accident after personnel are used from stabbing, and more traditional syringe has higher safe effect; But to so far, find to have urceolus and the structure of entry needle in any safety injector yet, the needs for medical personnel during and the safety injector of combination voluntarily according to actual the use for separating mutually.

In addition, the structure of above-mentioned this kind safety injector is comparatively complicated in design, and with the existing standard structure with after promptly abandon the existing suitable diversity of formula conventional syringe and exist; Therefore, not only assembling procedure is complicated when making this safety injector, and certainly will must significantly transform the traditional mode of production machinery of syringe; In other words, when desiring this safety injector of automatic batch production, the additional finance that must drop into tens thousand of units even millions of units in advance in the traditional mode of production of transforming syringe mechanically, cost of investment is too high, this commercial be can't be received.

Because the drawback of above-mentioned traditional product, the design people is based on abundant practical experience and Professional knowledge, through constantly studying, design, and after studying sample repeatedly and improving, creates this utility model finally.

Main purpose of the present utility model is, overcome the deficiencies in the prior art, and provide a kind of entry needle retractable safety injector, make it can be after finishing injection, with the inner space of injection needle restoring in a hollow ram, the generation probability of stabbing so as to the entry needle accident after will being used is reduced to minimum degree, and can avoid syringe to be repeated to use; Simultaneously, can be arbitrarily combined between the entry needle of this safety injector and urceolus or separate, also can freely match required outer cylinder size and entry needle count according to medicament kind, injection dose and injection site by medical personnel, not only can reduce production costs and stock's deposit quantity, more can improve the convenience that medical personnel use.

Of the present utility model time a purpose is, provide a kind of entry needle retractable safety injector, make it can use the traditional mode of production machinery of manufacturer's standard structure medical syringe to carry out automatic batch production, and need not to transform the traditional mode of production machinery of making this syringe, and can improve its coml value effectively.

Another purpose of the present utility model is, provides a kind of entry needle retractable safety injector, makes its simple structure, practicality and easy to operate, and can reduce its manufacturing cost effectively.

The purpose of this utility model is realized by following technical scheme.The retractable safety injector of a kind of entry needle, be provided with urceolus and entry needle, it is characterized in that it mainly includes the soft releasing member that a cartridge case assembly, an entry needle assembly and have the close structure of liquid, wherein: a cartridge case assembly, this cartridge case assembly includes: one stores the urceolus of medicament, and the top of this urceolus is provided with a steam vent and extends a vertical cervical region; One has top end opening and the inner push rod that is hollow form, and one be fixed in this hollow ram top and and this urceolus between the common rubber plunger device that keeps being provided with the close structure of liquid, this rubber plunger device includes the top end opening of this hollow ram of sealing and is provided with one and is extruded and the closure elements of easy section of fracture in advance, during this rubber plunger device injection and this hollow ram be serial verb construction; And after pharmacy security penetrates, this rubber plunger device be braked and and produce a relative motion between the hollow ram that is continued to promote, the easy section of this closure elements is extruded and fracture in advance; In entry needle receiving space top, be provided with the ball of a renitency effect, can prevent that the closure elements of easily broken structural design from not rupturing because of pressure is excessive when medicament has been injected as yet; One entry needle assembly is connected and fixed on this cartridge case assembly with replaceable structure, and this entry needle assembly includes: one can be connected and fixed on this urceolus top cervical region and also is provided with the housing that can freely be separated structure; One has suitable aperture and extends the outer entry needle of this housing; One is made into integration with this entry needle and fixes the needle stand of this entry needle, temporarily is fastened in this enclosure interior but this needle stand is provided with releasing structure; And a pair of this needle stand applies a flexible member to down spring; One is provided with the close structure of liquid and prevents that medicament from entering the intravital soft releasing member of this shell, piece was formed under it reached by last piece, the centre that should go up piece is provided with a perforate, the flange of following piece embeds its internal fixation, to go up piece and form a releasing member with following piece build-in, this releasing member is inserted the top ends of urceolus, and last piece is provided with in one group of locating hole that one group of lug is embedded in urceolus, and forms the close and airtight construction of liquid for driving fit mutually between releasing member and urceolus; Between the end face of piece on the releasing member and urceolus, leave a fine pitch in addition; And this time piece offers one just can hold the center through hole that this housing enters; When medicament is promoted by the rubber plunger device of this and hollow ram motion and after penetrating external world from this entry needle fully, this soft releasing member is promoted by this hollow ram that is promoted by continuation and a mobile minimum distance, force this needle stand and housing to break away from mutually, and then make this needle stand and entry needle because of bearing the elastic force effect of this flexible member, and behind the closure elements that ruptures in advance by this easy section, spring into inner space in this hollow ram.

The purpose of this utility model can also further realize by following technical measures.The retractable safety injector of aforesaid entry needle, wherein said housing offers several taper buttons on it and holds the hole, this needle stand then is provided with several upwards and outward extending slightly holding part, and the top of this holding part is one vertically to stretch out and be fastened on this taper button in advance and hold tapered flanges in the hole; These tapered flanges are pushed by the soft releasing member that hollow ram promoted and are held the hole with these taper buttons by this and break away from mutually after medicament is finished ejaculation.The retractable safety injector of aforesaid entry needle, wherein said needle stand which is provided with a pair of outward extending slightly holding part that upwards reaches, and the top of this holding part is a vertical outward extending tapered flanges; Offer a pair of taper button on this housing and hold the hole, and this elasticity holding part is fastened on the taper button in advance holds in the hole; These elasticity holding parts are pushed by the soft releasing member that hollow ram promoted by this and outwards to be opened, and break away from mutually with these elasticity holding parts after medicament penetrates fully.The retractable safety injector of aforesaid entry needle is respectively equipped with the screw thread that can spin mutually on its top cervical region of wherein said urceolus and this housing.The retractable safety injector of aforesaid entry needle is respectively arranged with the buckle flange and the guide groove of mutual interlocking on its top cervical region of wherein said urceolus and this housing.The retractable safety injector of aforesaid entry needle, wherein said notes pin are one from this needle stand respectively upwards and the two most advanced and sophisticated entry needle of downward two-way extension.The retractable safety injector of aforesaid entry needle, the contact surface of wherein said its upper and lower end parts of rubber plunger device and this urceolus are provided with the arc-shaped protrusions leakproof body that has the close configuration state of liquid and be parallel to each other.The retractable safety injector of aforesaid entry needle, wherein said rubber plunger device are respectively arranged with female thread and the external screw thread that spins mutually on it with on the top of this hollow ram.The retractable safety injector of aforesaid entry needle, the wherein said closure elements easy section on it is the easy section of a C shape.The retractable safety injector of aforesaid entry needle, the wherein said closure elements easy section on it be one fully penetration state be easy to the stressed cross shallow slot that splits.The retractable safety injector of aforesaid entry needle, but be provided with the grip slipper of a clamping needle stand in the housing of wherein said entry needle assembly, and above-mentioned grip slipper is that to be launched into the planar materials body of strip by one made; The centre position of this planar materials body is a head portion, and this head portion offers a ∏ shape shell fragment, offers a hole on ∏ shape shell fragment; Dual-side at head portion respectively is connected with a sidewall sections, is provided with outside punching press all-in-one-piece buckling parts on sidewall sections; Dual-side at sidewall sections is connected with a base portion, and this base portion is provided with an engine cliping hole; This planar materials body is provided with dotted line, along dotted line grip slipper is folded into the square body shape.The retractable safety injector of aforesaid entry needle, but be provided with the grip slipper of a clamping needle stand in the housing of wherein said entry needle assembly, and it is made that above-mentioned grip slipper expands into the planar materials body of inverted T-shaped shape by one; The centre position of this planar materials body extends upward and is provided with bullet lid, and this bullet covers and offers a hole; Offering a groove at nearly dual-side, is that the boundary forms a fastening partly with the groove, and this fastening part is provided with an engine cliping hole; This planar materials body surrounds a drum shape, and two fastening parts are overlapped up and down, is converted into horizontally downwards along groove, and two engine cliping holes overlap on and constitute an integral body together.

This utility model compared with prior art has tangible advantage and good effect.By above technical scheme as can be known, the retractable safety injector of this utility model entry needle, it includes a cartridge case assembly, an entry needle assembly and a soft releasing member.The cartridge case assembly is made up of with push rod interlock and rubber plunger device with an easily broken closure elements a hollow ram and that can be used for accommodating entry needle in order to the urceolus that stores medicament, an inner hollow.The entry needle assembly include one with replaceable frame mode but combined be fastened in the releasing structure mode the entry needle on housing and needle stand and a pair of needle stand thereof of the vertical housing of urceolus, that be fixed in applies a flexible member to down spring.After finishing injection, continue upwards to promote hollow ram one minimum distance, make it promote soft releasing member moves thereupon, force entry needle and needle stand thereof to break away from housing by releasing member, and the elastic force that utilizes flexible member impels needle stand and the entry needle fixed on it moves down, the entry needle needle stand that moves down falls to the inside of hollow ram behind the easily broken closure elements that destroys the rubber plunger device, can avoid using the accident of back entry needle to stab incident.It can be with injection needle restoring in the inner space of a hollow ram after finishing injection, and the generation probability that the entry needle accident after being used is stabbed can be reduced to minimum degree, and can avoid syringe to be repeated to use; Simultaneously, can be arbitrarily combined between the entry needle of this safety injector and urceolus or separate, also can freely match required outer cylinder size and entry needle count according to medicament kind, injection dose and injection site by medical personnel, not only can reduce production costs and stock's deposit quantity, more can improve the convenience that medical personnel use; It can use the traditional mode of production machinery of manufacturer's standard structure medical syringe to carry out automatization's production in batches, and need not to transform the traditional mode of production machinery of making this syringe, and can improve its coml value effectively; Its simple structure, practicality and easy to operate, and can reduce its manufacturing cost effectively.

In sum, the retractable safety injector of this utility model entry needle, because of it has an entry needle receiving space, finish the injection back by the continuous action of injecting, entry needle is disappeared fully in this receiving space inside, and the generation probability that the entry needle accident after being used can be stabbed accident is reduced to minimum degree, and can avoid syringe to be repeated to use; Simultaneously, can be arbitrarily combined between the entry needle of this safety injector and urceolus or separate, also can freely match required outer cylinder size and entry needle count according to medicament kind, injection dose and injection site by medical personnel; It not only can reduce manufacturing cost and stock deposit quantity, more can improve the convenience of medical personnel when using, and have substantial practicality, no matter it structurally or all have on the function and significantly improve, really is a new and innovative, progressive, practical new design.

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

Fig. 1 assembles preceding axial section for retractable safety injector first embodiment of this utility model entry needle.

Fig. 2 is the amplification view of entry needle assembly in the safety injector shown in Figure 1.

Fig. 3 is the part amplification view of cartridge case assembly in the safety injector shown in Figure 1.

Axial section when Fig. 4 prepares injection position for safety injector shown in Figure 1 is positioned at.

Fig. 5 is the partial enlarged view of A part among Fig. 4.

Fig. 6 for safety injector shown in Figure 4 after finishing injection, the axial section in the time of when this releasing member forces entry needle needle stand and housing to break away from mutually.

Fig. 7 is the partial enlarged drawing of B part among Fig. 6.

Fig. 8 falls into axial section when hollow ram is inner for the entry needle in the safety injector shown in Figure 4 and needle stand thereof.

Fig. 9 is the exploded perspective view of rubber plunger device first embodiment in this utility model safety injector.

Axonometric chart when Figure 10 is rubber plunger device first embodiment shown in Figure 9 and hollow ram combination.

Axonometric chart when Figure 11 is rubber plunger device second embodiment and hollow ram combination.

Profile when Figure 12 is used for retractable safety injector second embodiment of this utility model entry needle and a blood collection tube.

Figure 13 is that the two most advanced and sophisticated entry needle among safety injector second embodiment is fallen into the axial section when hollow ram is inner.

Figure 14 assembles preceding part amplification view for retractable safety injector the 3rd embodiment of this utility model entry needle.

Figure 15 is the axial section of retractable safety injector the 4th embodiment of this utility model entry needle when preparing injection position.

Figure 16 is the C part partial enlarged drawing of entry needle assembly in the safety injector shown in Figure 15.

Figure 17 is the exploded perspective view of grip slipper and clamping needle stand.

Figure 18 is the expansion view of grip slipper.

Figure 19 is the axial section after the retractable safety injector of this utility model entry needle is positioned at injection.

Figure 20 is the partial enlarged drawing of D part among Figure 19.

Figure 21 is the axial section of retractable safety injector the 5th embodiment of this utility model entry needle when preparing injection position.

Figure 22 is the partial enlarged drawing of E part among Figure 21.

Figure 23 is the exploded perspective view of grip slipper and clamping needle stand.

Figure 24 is the expansion view of grip slipper.

Figure 25 is the axial section after the retractable safety injector of this utility model entry needle is positioned at injection.

Figure 26 is the partial enlarged drawing of F part among Figure 25.

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

See also Fig. 1 to shown in Figure 3, retractable safety injector first embodiment of this utility model entry needle, it mainly includes the soft releasing member 50 that a cartridge case assembly 10, an entry needle assembly 30 and have the close structure of liquid.Wherein, this cartridge case assembly 10 (as shown in Figure 3) includes: one in order to store the urceolus 12 of medicament, the top of this urceolus 12 is provided with a steam vent 17 and extends one and is provided with female thread 14 and has the hollow stem 18 of a top end opening 16, one steam vent 17, and close top is provided with symmetric locating hole 19; One inner hollow and have the push rod 20 of an entry needle receiving space 24; This push rod 20 is provided with and extends one on its top and be provided with external screw thread 27 and have the hollow stem 29 of a top end opening 22, and one closely be screwed together in push rod 20 tops and with the rubber plunger device 28 of these push rod 20 interlocks, this rubber plunger device 28 also forms the driving fit structure and has the close and airtight effect of liquid with internal face 26 driving fits of urceolus 12, and this rubber plunger device 28 includes one can seal the closure elements 29 of the easily broken structural design of these push rod 20 top end openings 22; And be contained in ball 25 in entry needle receiving space 24 tops, and this ball 25 has renitent effect, and the closure elements 66 that can prevent to be provided with easy section 54 does not rupture because of pressure is excessive when injection finishes as yet at medicament.This entry needle assembly 30 (as shown in Figure 2) includes: one is provided with external screw thread 46 and can be connected and fixed on the housing 40 that also can freely be separated on the hollow stem 18 of this urceolus 12, this housing 40 extend upward one with the integrated pin of housing lid 36, and pin lid 36 and 40 of housings have an easy section 37; Integrated entry needle 32 and needle stand 34 in order to support this entry needle 32, this entry needle 32 and part stretch out in outside this housing 40; And this needle stand 34 applied a flexible member 48 that moves down elastic acting force.This needle stand 34 has a pair of outward extending slightly holding part 42 that upwards reaches, and the top of holding part 42 then is a vertical outward extending tapered flanges 44; Then offer a pair of taper button that cooperatively interacts with this holding part 42 on the housing 40 and hold hole 38; When assembling this entry needle assembly 30, the taper that makes the tapered flanges 44 of this needle stand holding part 42 be fastened on this housing 40 is in advance buckled and is held in the hole 38, but and then this entry needle 32 and needle stand 34 thereof is fastened on this housing 40 in the releasing structure mode.This soft releasing member 50 (as shown in Figure 3) by last piece 51 and down piece 52 formed, the centre that should go up piece 51 is provided with a perforate 54, it can supply down, and the flange 56 of piece 52 embeds fixing, make piece 51 and following piece 52 be formed a releasing member 50 by build-in, again this releasing member 50 is placed in the top ends of urceolus 12, one group of lug 57 that piece 51 is provided with on can making when inserting is embedded in one group of locating hole 19 of urceolus 12, and 12 of releasing member 50 and urceolus have the close and gastight effect of liquid for driving fit structure mutually; In addition between the end face 13 of piece 51 on the releasing member 50 and urceolus 12, leave a fine pitch 55, and this time piece 52 offers one and just can hold the center through hole 53 that this housing 40 enters.

Please consult Fig. 4 and shown in Figure 5 simultaneously, use this utility model safety injector to carry out hypodermic process and mode of operation and traditional syringe roughly the same, at first the entry needle assembly 30 with selected appropriate size is rotatably connected on the cervical region 18 of urceolus 12, at this moment, the Lower Half of housing 40 is just closely squeezed with the frame mode with the close effect of liquid and is closed in the center through hole 53 of this soft releasing member 50, the tapered flanges 44 that fastens needle stand 34 and housing 40 and taper are buckled hold hole 38 then between this soft releasing member 50 and 13 spacings of being reserved 55 of urceolus 12 end faces, make needle stand 34 and housing 40 when this state, needn't worry mutual disengaging.After finishing the assembling of entry needle assembly 30 and cartridge case assembly 10, slightly the application of force is reversed this pin lid 36 (in conjunction with shown in Figure 2) thereupon, make it along 37 fractures of easy section, and separate with housing 40 and be removed, and then make this syringe form as shown in Figure 4 preparation inject state.When medical personnel pull back push rod 20, can medicament 11 be absorbed in the inside of urceolus 12 via entry needle 32 from an extraneous container by pull of vacuum; And when promoting push rod 20 forward, the medicament 11 of urceolus 12 inside is penetrated from entry needle 32.

Please consult Fig. 6 more simultaneously to shown in Figure 8, outside this syringe 10 is released the medicament 11 of urceolus 12 inside tube fully, that is following 52 bottom surface of the end face of rubber plunger device 28 and soft releasing member 50 is when being in contact with one another, user can be again the application of force and continue to promote this hollow ram 20 slightly, be embedded in up to the one group of non-return flange 514 that is positioned at these hollow ram 20 positon of near bottom till one group of slotted eye 513 of these urceolus 12 positon of near bottom; The hollow ram 20 that this structure can be guaranteed to finish after the injection can not be pulled outwardly out again, and can prevent to use once again this syringe 10; Simultaneously as shown in Figures 7 and 8, when the non-return flange 514 of hollow push rod 20 is embedded in the slotted eye 513 of this urceolus 12, the apical margin of this hollow ram 20 is pushed upwardly to little and is higher than or extremely near the height of these housing 40 root edges, and make the be fixed root edge of motionless hard shell 40 of the easy section 58 of a C shape (as shown in Figure 9) on the closure elements 66 of this soft rubber plunger assembly 28 push and form the opening 59 of fracture in advance, in these opening 59 fractures, can make the easy section 58 of C shape ball 25 extruding downwards be sprung into the inside of the entry needle receiving space 24 of hollow ram 20; Simultaneously, 50 of this soft releasing members are promoted by the apical margin of hollow ram 20 and move up, and then a group of making piece 51 is decided lug 57 and is broken away from one group of locating hole 19 of urceolus 12 and move up (shown in Figure 5 in conjunction with consulting), and the soft releasing member 50 that this moves up is pushed by the urceolus 12 of hard and housing 40, and the taper button of partly being clamp-oned this housing 40 is held in the hole 38, and then the tapered flanges 44 of needle stand 34 extruded to buckle in taper hold outside the hole 38, cause the mutual fastening effect of 40 of this needle stand 34 and housings to be disengaged, be fixed in the entry needle 32 on the needle stand 34 this moment, because of the thrust of only bearing flexible member 48 moves down, and after passing through the easy section 58 formed openings 59 of C shape that rupture in advance on this closure elements 66, and sprung in the inside of the entry needle receiving space 24 of hollow ram 20, and be positioned at the top of ball 25, entry needle 32 is disappeared fully and be not exposed to the outside, and then can prevent that the contingency that anyone entry needle after being used is stabbed from taking place, and the entry needle after can avoiding using is used once again.

Please consult Fig. 7, Fig. 9, shown in Figure 10 simultaneously, above-mentioned rubber plunger device 28 is a cylindrical shape, its vertical mid portion is this closure elements 66, and this closure elements 66 is circular-arc, and its periphery has easy section 58 of a C shape that is easy to rupture and the extremely short coupling part 512 of a distance.As described in epimere, after finishing injection, the easy section 58 of this C shape can be pushed by the root edge of housing 40 and rupture, and this closure elements 66 only is connected with periphery with this coupling part 512, therefore, when needle stand 34 is promoted downwards by flexible member 48, this closure elements 66 can be squeezed into plumbness downwards, make this rubber plunger device 28 form one and allow the opening 59 (as shown in Figure 7) that needle stand 34 and entry needle 32 pass through; When needle stand 34 and entry needle 32 by after this opening 59, this closure elements 66 is with the elastic reaction of itself material and return back to the position of approximate horizontal, and can roughly seal this opening 59 again, make the entry needle 32 that enters behind hollow ram 20 inside and needle stand 34 thereof be unlikely that accident is exposed by this opening 59.The upper and lower end parts of this rubber plunger device 28 is provided with arc-shaped protrusions leakproof body 60, and is provided with a female thread 62 in the bottom; During assembling, the female thread 62 of rubber plunger device 28 is screwed in hollow ram 20 vertical external screw threads 27, and its several arc-shaped protrusions leakproof bodies 60 also just constitute several and urceolus 12 internal faces form the close structure of liquid jointly.28 in this hollow ram 20 and rubber plunger device are a continuous action relation, and it can after finishing injection, still can continued upwards to be pushed to position as shown in Figure 7 with urceolus 12 inner medicinal liquid 11 total releases with hollow ram 20.

See also shown in Figure 11ly, be positioned at the easy section of C shape of closure elements 66 peripheries among this rubber plunger device second embodiment, can be by directly drawing the bottom surface of being located at closure elements 66 but not fully the cross shallow slot 68 of penetration state replaced; This not fully the cross shallow slot 68 of penetration state when injecting, still have the close effect of liquid, can prevent that medicament from entering in the receiving space of entry needle; But after finishing injection, this cross shallow slot 68 can split and forms an opening because of the extruding of housing 40, with allow needle stand 34 and entry needle 32 by and enter the receiving space inside of entry needle.

See also Figure 12 and shown in Figure 13, this utility model safety injector also can with among first embodiment shown in Figure 1 from the make progress entry needle 32 of unidirectional extension of needle stand 34, be replaced with among second embodiment as shown in figure 12 respectively upwards and the two most advanced and sophisticated entry needle 76 of downward two-way extension from needle stand 77, this safety injector second embodiment can be used, so as to implementing the operation of blood drawing sampling with a blood collection tube of commonly using 78.This safety injector second embodiment includes and the identical cartridge case assembly 70 of above-mentioned safety injector first embodiment, soft releasing member 72 and identical entry needle assembly 74 except that two most advanced and sophisticated entry needles 76.As shown in figure 12, use the operational approach of this safety injector second embodiment, be that the hollow ram in the cartridge case assembly 70 73 is pulled out outside urceolus 71 in advance fully, the blood collection tube 78 that again this is had top closure body 79 is inserted in the inside of urceolus 71, and pierce through this top closure body 79 by the bottom tip of two most advanced and sophisticated entry needles 76, can implement the operation of blood drawing sampling in a conventional manner.As shown in figure 13, finish after the blood drawing sampling, this hollow ram 73 is inserted in again the inside of urceolus 71, and continue the application of force in the mode of aforementioned safety injector first embodiment and upwards promote hollow ram 73, the most advanced and sophisticated entry needle 76 of this pair can be accommodated in the inside of the entry needle receiving space 75 of hollow ram 73.

See also shown in Figure 14, this utility model safety injector the 3rd embodiment, it mainly constructs also identical with above-mentioned first embodiment haply, below only is illustrated with regard to its part that is different from first embodiment.Housing 801 in this entry needle assembly 87 is provided with several buckle flanges 802, then offer the L shaped guide groove 805 that several cooperate with buckle flange 802 on the cervical region 804 of urceolus 803, make 86 of entry needle assembly 87 and cartridge case assemblies can utilize these buckle flange 802 that cooperatively interacts and L shaped guide grooves 805, and cooperatively interact fixing in the mode of replaceable structure; In addition, pin lid 807 is two individualities that can be separated from each other or plug together structure mutually with housing 801, is not the structural design that is formed in one as among first embodiment.

See also Figure 15, Figure 16, Figure 17 and shown in Figure 180, this utility model safety injector the 4th embodiment, it mainly constructs roughly also identical with above-mentioned first embodiment, below only is illustrated with regard to its part that is different from first embodiment.But be provided with the grip slipper 82 of a clamping needle stand 83 in the housing 81 of this entry needle assembly 80, above-mentioned grip slipper 82 is the planar materials bodies made (as shown in figure 18) that are launched into strip by; The centre position of this planar materials body is a head portion 821, and this head portion 821 offers a ∏ shape shell fragment 822, offers a hole 823 on ∏ shape shell fragment 822; Dual-side at head portion 821 respectively is connected with a sidewall sections 824, is provided with the buckling parts 825 of outside drawing on sidewall sections 824; Be connected with a base portion 826 at sidewall sections 824 dual-sides, be provided with an engine cliping hole 827 in base portion 826; This planar materials body can be folded into square shape (as shown in figure 17) with grip slipper 82 along dotted line; Assemble this grip slipper 82 in housing 81 time, making the buckling parts 825 of grip slipper 82 be fastened on buckleing of needle stand 83 in advance holds in the hole 811, assemble this entry needle assembly 80 again in grip slipper 82, the engine cliping hole 827 that makes this grip slipper 82 in advance stopper in the clip engine trough 831 of needle stand 83, but and then this entry needle 84 and needle stand 83 thereof are fixed on this grip slipper 82 by stopper in the releasing structure mode.

Please consult Figure 19 and shown in Figure 20 simultaneously, when the soft releasing member 50 that moves up is pushed and partly clamp-oned buckleing of this housing 81 and hold in the hole 811 by the urceolus 12 of hard and housing 81, and then the buckling parts 825 of needle stand 34 extruded in buckleing hold outside the hole 825, cause the mutual stopper effect of 82 of this needle stand 34 and grip slippers to be disengaged, the entry needle 84 that is fixed on the needle stand 83 is moved down simultaneously, and after passing through the easy section 58 formed openings 59 of C shape that rupture in advance on this closure elements 66, and fall in the inside of the entry needle receiving space 24 of hollow ram 20, and be positioned at the top of ball 25, make entry needle 32 safety disappearances not be exposed to the outside, and then can prevent that the contingency that anyone entry needle after being used is stabbed from taking place, and the entry needle after can avoiding using is used once again.

See also Figure 21, Figure 22 and shown in Figure 23, this utility model safety injector the 5th embodiment, it mainly constructs roughly also identical with above-mentioned first embodiment, below only is illustrated with regard to its part that is different from first embodiment.But be provided with the grip slipper 92 of a clamping needle stand 93 in the housing 91 of this entry needle assembly 90, above-mentioned grip slipper 92 is the planar materials bodies made (as shown in figure 24) that expand into the inverted T-shaped shape by; The centre position of this planar materials body extends upward and is provided with bullet lid 921, offers a hole 922 on this bullet lid 921; Offer a groove 923 at nearly dual-side, with groove 923 is that boundary forms a fastening part 924, this fastening part 924 is provided with an engine cliping hole 925, this planar materials body can surround a drum shape, and two fastening parts 924 are overlapped up and down, be converted into horizontal downwards along groove 923, two engine cliping holes 925 are overlapped on together, assemble this grip slipper 92 in housing 91 time, making the buckling parts 926 of grip slipper 92 be fastened on buckleing of needle stand 93 in advance holds in the hole 911, assemble entry needle assembly 90 again in grip slipper 92, the engine cliping hole 922 that makes this grip slipper 92 in advance stopper in the clip engine trough 931 of needle stand 93, but and then this entry needle 94 and needle stand 93 thereof are fixed on this grip slipper 92 by stopper in the releasing structure mode.

Please consult Figure 25 and shown in Figure 26 simultaneously, when the soft releasing member 50 that moves up is pushed and partly clamp-oned buckleing of this housing 91 and hold in the hole 911 by the urceolus 12 of hard and housing 91, and then the buckling parts 926 of needle stand extruded in buckleing hold outside the hole 911, cause the mutual stopper effect of 92 of this needle stand 93 and grip slippers to be disengaged, the entry needle 94 that is fixed on the needle stand 93 is moved down simultaneously, and after passing through the easy section 58 formed openings 59 of C shape that rupture in advance on the closure elements 66, and fall between the entry needle of hollow ram 20 is accommodated 24 inside, and be positioned at the top of ball 25, entry needle 32 is disappeared fully be not exposed to the outside, and then can prevent that the contingency that anyone entry needle after being used is stabbed from taking place, and the entry needle after can avoiding using is used once again.

Claims (12)

1, the retractable safety injector of a kind of entry needle is provided with urceolus and entry needle, it is characterized in that it mainly includes the soft releasing member that a cartridge case assembly, an entry needle assembly and have the close structure of liquid, wherein:

One cartridge case assembly, this cartridge case assembly includes: one stores the urceolus of medicament, and the top of this urceolus is provided with a steam vent and extends a vertical cervical region; One has top end opening and the inner push rod that is hollow form, and one be fixed in this hollow ram top and and this urceolus between the common rubber plunger device that keeps being provided with the close structure of liquid, this rubber plunger device includes the top end opening of this hollow ram of sealing and is provided with one and is extruded and the closure elements of easy section of fracture in advance, during this rubber plunger device injection and this hollow ram be serial verb construction; In entry needle receiving space top, be provided with the ball of a renitency effect;

One entry needle assembly is connected and fixed on this cartridge case assembly with replaceable structure, and this entry needle assembly includes: one can be connected and fixed on the top cervical region of this urceolus and also is provided with the housing that can freely be separated structure; One has suitable aperture and extends the outer entry needle of this housing; One is made into integration with this entry needle and fixes the needle stand of this entry needle, temporarily is fastened in this enclosure interior but this needle stand is provided with releasing structure; And a pair of this needle stand applies a flexible member to down spring;

One is provided with the close structure of liquid and prevents that medicament from entering the intravital soft releasing member of this shell, piece was formed under it reached by last piece, the centre that should go up piece is provided with a perforate, the flange of following piece embeds its internal fixation, to go up piece and form a releasing member with following piece build-in, this releasing member is placed in the top ends of urceolus, and last piece is provided with in one group of locating hole that one group of lug is embedded in urceolus, and forms the close and airtight construction of liquid for driving fit mutually between releasing member and urceolus; Between the end face of piece on the releasing member and urceolus, leave a fine pitch in addition; And this time piece offers one just can hold the center through hole that this housing enters.

2, the retractable safety injector of entry needle according to claim 1, it is characterized in that described housing offers several taper buttons on it and holds the hole, this needle stand then is provided with several upwards and outward extending slightly holding part, and the top of this holding part is one vertically to stretch out and be fastened on this taper button in advance and hold tapered flanges in the hole.

3, the retractable safety injector of entry needle according to claim 1 is characterized in that described needle stand which is provided with a pair of outward extending slightly holding part that upwards reaches, and the top of this holding part is a vertical outward extending tapered flanges; Offer a pair of taper button on this housing and hold the hole, and this elasticity holding part is fastened on the taper button in advance holds in the hole.

4, the retractable safety injector of entry needle according to claim 1 is characterized in that being respectively equipped with the screw thread that can spin mutually on described urceolus top cervical region and this housing.

5, the retractable safety injector of entry needle according to claim 1 is characterized in that being respectively arranged with on its top cervical region of described urceolus and this housing buckle flange and the guide groove of mutual interlocking.

6, the retractable safety injector of entry needle according to claim 1 is characterized in that described notes pin is one from this needle stand respectively upwards and the two most advanced and sophisticated entry needle of downward two-way extension.

7, the retractable safety injector of entry needle according to claim 1 is characterized in that the contact surface of described its upper and lower end parts of rubber plunger device and this urceolus is provided with the arc-shaped protrusions leakproof body that has the close configuration state of liquid and be parallel to each other.

8, the retractable safety injector of entry needle according to claim 1 is characterized in that described rubber plunger device is respectively arranged with female thread and the external screw thread that spins mutually on it with on the top of this hollow ram.

9, the retractable safety injector of entry needle according to claim 1 is characterized in that the easy section of described closure elements on it is the easy section of a C shape.

10, the retractable safety injector of entry needle according to claim 1, it is characterized in that the easy section of described closure elements on it be one fully penetration state be easy to the stressed cross shallow slot that splits.

11, the retractable safety injector of entry needle according to claim 1, but it is characterized in that being provided with in the housing of described entry needle assembly the grip slipper of a clamping needle stand, and above-mentioned grip slipper is that to be launched into the planar materials body of strip by one made; The centre position of this planar materials body is a head portion, and this head portion offers a ∏ shape shell fragment, offers a hole on ∏ shape shell fragment; Dual-side at head portion respectively is connected with a sidewall sections, is provided with outside punching press all-in-one-piece buckling parts on sidewall sections; Dual-side at sidewall sections is connected with a base portion, and this base portion is provided with an engine cliping hole; This planar materials body is provided with dotted line, along dotted line grip slipper is folded into the square body shape.

12, the retractable safety injector of entry needle according to claim 1, but it is characterized in that being provided with in the housing of described entry needle assembly the grip slipper of a clamping needle stand, and it is made that above-mentioned grip slipper expands into the planar materials body of inverted T-shaped shape by one; The centre position of this planar materials body extends upward and is provided with bullet lid, and this bullet covers and offers a hole; Offering a groove at nearly dual-side, is that the boundary forms a fastening partly with the groove, and this fastening part is provided with an engine cliping hole; This planar materials body surrounds a drum shape, and two fastening parts are overlapped up and down, is converted into horizontally downwards along groove, and two engine cliping holes overlap on and constitute an integral body together.

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