CN100475282C - Syringe with back draft - Google Patents

Abstract

An injector with withdraw force is composed of a cylinder with a locating hole segment and a thicker segment, a needle set jammed at the front end of said cylinder, a detachable limit part for locating said needle set, a push rod able to slide in said cylinder, and a withdraw unit able to generate a force to withdraw the needle set back in said push rod.

Description

Syringe with back-suction

[technical field]

The present invention relates to a kind of syringe, particularly relate to a kind of syringe that can hide needle body with back-suction.

[background technology]

Syringe after the general injection must be dealt carefully with sharp-pointed needle body, avoids the needle body spinosity body of hurting sb.'s feelings, even remained in the blood infection that has the source of infection on the needle body.Though conventional syringe includes the needle guard that coats needle body, but the situation of losing, dropping is often arranged, and because needle guard can be quite limited for the aperture that needle body places, so, user must carefully be done back the action of cover needle guard after finishing injection, if careless slightly or be subjected to the external force effect, the acupuncture incident is just easily arranged, so the disappearance on the safety is arranged in use.

Therefore, in order to improve above-mentioned syringe cylinder disappearance in the use, No. the 91102538th, the TaiWan, China patent " safety syringe-drum " that the previous institute of this case applicant researches and develops and applies for, No. 91118921 " safety syringe-drum ", No. 91115946 " syringe " with back-suction, No. 91134962 " safety device " with injection and blood drawing function, No. 91135720 " deserted syringe " "; No. 92109392 " deserted syringe "; and No. 92131220 application for a patent for invention cases such as " medical instruments "; mainly be after injection is finished; with the needle body pumpback and be accommodated in the syringe; whereby, utilize the design of hiding needle body, avoid stabbing personnel, the injury of exempting the daily use syringe cylinder of medical personnel is with frightened.

But this case inventor is still adhering to excelsior spirit, continues to be engaged in the developmental research of syringe, thereby finds aspect the smooth property of former invention when pumpback, and the reduction aspect of whole caliber, still has the space that can promote.

[summary of the invention]

The object of the present invention is to provide a kind of syringe that dwindles caliber and promote the operation simplification with back-suction.

A kind of syringe with back-suction of the present invention comprises:

One syringe, have the axis of centering on and define a macropore and a surrounding wall in a little duct, this surrounding wall has a reverse port of export and an arrival end, this aperture road has a locating hole section in abutting connection with this macropore, in abutting connection with this locating hole section and aperture greater than a wide section of putting of this locating hole section, in abutting connection with this wide section of putting and this port of export and aperture less than a pin hole section of this wide section of putting, and be formed on this wide section of putting and the intersegmental shoulder of this pin hole;

One syringe needle group, have a fixed needle stand and a needle body mutually, this needle stand is a hollow tubular, and has the front end rigion of fixing in this locating hole section, and being set in a rear end section of this macropore, this needle body is to be placed through this needle stand and to pass this syringe by this pin hole section and this port of export;

One locating part, be airtight fixing in the macropore of this syringe, and can be under external force towards this port of export displacement, and have along this axis direction run through and with the localized perforation of the airtight fit of this needle stand rear end section;

One push rod, be to become to be slidingly matched with the macropore of this syringe, and have around this axis X and define the tube wall of a tube chamber, an and end cap, this tube wall has towards a front end face of this locating part and open this tube chamber, open this tube chamber and is in reverse to a rear end face of this front end face, and in abutting connection with a tubule of this front end face footpath section and a big caliber section in abutting connection with this tubule footpath section, this end cap is that upper shield is at this rear end face; It is characterized in that: also comprise

One pumpback device, have this push rod front end face of detachable liftoff sealing and can with the solid spigot of this needle stand cover, and be contained in this tube chamber and can produce one of back-suction and reply part, this answer part can drive this spigot and be moved in the big caliber section of this push rod;

Whereby, when this push rod compels to squeeze this locating part towards port of export displacement, and when discharging this needle stand rear end section, this spigot can be overlapped solid this needle stand and be formed interlock, and can push this needle stand front end rigion and enter in this wide section of putting, remove the fixing state between this needle stand and this syringe, remove the concretion state between this spigot and this push rod tube wall simultaneously, and start this answer part, make this syringe needle group by the traction pumpback of this spigot to being hidden in this tube chamber.

Described syringe with back-suction is characterized in that: this needle stand is that metal is made and in a tubular form.

Described syringe with back-suction, it is characterized in that: this spigot has and is contained in the back of one in the big caliber section of this push rod bolt section, is passed this push rod tubule footpath section and pass a preceding bolt section of this push rod along this axis direction by this back bolt section, and by the thread segment of this preceding bolt section along this axis direction extension, this thread segment passes this locating part and compels to squeeze and places in this needle stand, and this spigot and this pin base fastener are solidified as a whole.

Described syringe with back-suction, it is characterized in that: this needle stand also has a hollow convex column that is formed on this rear end section and passes this locating part, and this spigot has and is contained in the back of one in the big caliber section of this push rod bolt section, is passed this push rod tubule footpath section and pass a preceding bolt section of this push rod along this axis direction by this back bolt section, and be formed on a front end face of this preceding bolt section and towards a groove of this needle stand, to be that the projection with this groove and this needle stand is relative engage this spigot, and this spigot and this pin base fastener are solidified as a whole.

Described syringe with back-suction is characterized in that: this push rod tube wall also has a scrobicular ring that is formed in this big caliber section, and this spigot also has and is formed on this back bolt section and a bulge loop of relative engaging with this scrobicular ring.

Described syringe with back-suction, it is characterized in that: the answer part of this pumpback device is a drawing spring, this answer part have with this spigot after the fixed end of pulling back of bolt section, and be positioned at a positioning end of contiguous this push rod one rear end face, when this spring-actuated, this spring is pulled back end can elastic shrinkage and this spigot of pulling back, and makes this spigot drive this syringe needle group.

Described syringe with back-suction, it is characterized in that: this push rod also has an enlarged cavity section in abutting connection with this big caliber section and this tube wall rear end face, is formed on this big caliber section with this enlarged cavity is intersegmental and encircle rib by this big caliber section along one of this axis direction extension, and the location end ring of this spring of confession is put at this tube wall and this ring intercostal.

Described syringe with back-suction, it is characterized in that: this push rod tube wall also has a scrobicular ring that is formed in this big caliber section, this spigot also has a bolt head that is formed on this bolt section rear end, back, and is formed on a bulge loop of this bolt head outer surface and relative engaging with this scrobicular ring.

Described syringe with back-suction, it is characterized in that: this push rod tube wall also has a shoulder that is formed on intersegmental and contiguous this front end face of the large and small caliber of this tube chamber, the answer part of this pumpback device is a compression spring, this spring has an abutment end that is resisted against on this shoulder, and be in reverse to one of this abutment end and bounce up end, this spigot is to pass this spring with this back bolt section, and urge this spring with this bolt head and bounce up end, this spring bounces up end meeting elastic stretch and this spigot of pushing and withstanding, makes this spigot drive this syringe needle group and is moved in the big caliber section of this tube wall.

Described syringe with back-suction is characterized in that: this push rod also has a piston, and this piston is to be nested with on the section of this tubule footpath and the syringe surrounding wall is airtight contacts with this.

Described syringe with back-suction, it is characterized in that: this answer part is a kind of intraluminal utmost point low pressure of this push rod that is formed on, when this spigot is removed concretion state with this push rod tube wall, can make air pressure flow to tube chamber and produce back-suction, and can and be accommodated in the tube chamber of push rod the pumpback of syringe needle group by the external world.

Described syringe with back-suction is characterized in that: this push rod also has an O type ring, and this end cap has an annular groove chimeric with this tube wall rear end face, and this O type ring is to be contained between the annular groove of this tube wall rear end face and this end cap.

Described syringe with back-suction, it is characterized in that: this pumpback device also has a cork, and this spigot have be contained in the back of one in the big caliber section of this push rod bolt section, by the tightening latch of this back bolt section along this axis direction extension, and be formed on the head of this tightening latch one rear end, this cork is to be nested with on this tightening latch and this head, and the push rod tube wall is airtight contacts with this.

Described syringe with back-suction, it is characterized in that: this pumpback device also has a cork, and this spigot has a tightening latch that is contained in the back of one in the big caliber section of this push rod bolt section, is extended and supply this cork to be nested with along this axis direction by this back bolt section, and be formed on this tightening latch one rear end and urge a head of locating this cork, this cork is airtight being nested with on this tightening latch, and the push rod tube wall is airtight contacts with this.

Described syringe with back-suction, it is characterized in that: this needle stand also has a projection that is formed on this rear end section, this push rod has an annular that is formed in this tubule footpath section and is connected edge, and this spigot also have be formed on a front end face and towards a shrinkage pool of this needle stand, be formed on an outer surface and be connected an annular concave ditch of the corresponding engaging of edge with this push rod, and be formed on the shrinkage part of a rear end, this spigot is to engage with the protruding bolt of this needle stand with this shrinkage pool, and the push rod tube wall is airtight contacts with this with this outer surface.

Described syringe with back-suction is characterized in that: this spigot also has a gilled rings that passes the expansion of this push rod front end face and annular radial, and this gilled rings is that the syringe surrounding wall is airtight contacts with this.

Described syringe with back-suction, it is characterized in that: this push rod tube wall also have in abutting connection with this tubule footpath section and this big caliber section one in the caliber section, after the urgent positioning states of this spigot and this tube wall tubule footpath section is disengaged, can enter the bigger middle caliber section of caliber, and continue with this outer surface with should in caliber is intersegmental keeps airtight and slide displacement with lower frictional resistance, after entering this big caliber section to this spigot, airtight conditions is removed.

Described syringe with back-suction, it is characterized in that: this syringe also has a sealing member, the sealing part has an elasticity airtight pad of fixing in the wide section of putting of this syringe, an and packing ring that is resisted against between airtight pad of elasticity and needle stand, make and define a sealing and a compressible pressure accumulation space between sealing part and this locating part, this needle stand front end face is to be resisted against on the sealing part, and has a breach that is communicated with this pressure accumulation space, accumulate in advance in this pressure accumulation space the fluid media (medium) that can produce predetermined pressure is arranged, when push rod pushes this locating part towards this syringe port of export displacement, can compression fluid medium and the force value the pressure accumulation space in is risen, form the auxiliary propelling movement power of one this needle stand of passing in the push rod.

Described syringe with back-suction is characterized in that: the fluid media (medium) in this pressure accumulation space is gas or liquid.

Described syringe with back-suction is characterized in that: this syringe also has and connects this macropore and this little duct and do not have the camber taper seat that a stage differs from, and is formed on the several spacer fins on this camber taper seat, and this needle stand is located in this spacer fin clamping.

Described syringe with back-suction is characterized in that: this push rod also has in abutting connection with an enlarged cavity section of this big caliber section and this tube wall rear end face.

The invention is characterized in: this has the syringe needle group of back-suction, this spigot can fix this needle stand and form interlock, and can push this needle stand front end rigion and enter in this wide section of putting, remove the fixing state of this needle stand, remove the concretion state of this spigot and this push rod tube wall simultaneously, and start this answer part, make this syringe needle group by the traction pumpback of this spigot to being hidden in this pusher tube intracavity.

[description of drawings]

The present invention is described in detail below in conjunction with drawings and Examples.

Fig. 1 is an exploded view, illustrates that the present invention one has first preferred embodiment of the syringe of back-suction.

Fig. 2 is a cutaway view, and the combination situations of this first preferred embodiment is described.

Fig. 3 is a part of cutaway view, illustrates that a spigot engages with a needle stand in this first preferred embodiment.

Fig. 4 is a part of cutaway view, illustrates that this first preferred embodiment pushes this needle stand one front end rigion and enter in the wide section of putting.

Fig. 5 is a part of cutaway view, illustrates that this first preferred embodiment unloads this spigot.

Fig. 6 is a cutaway view, and this this needle stand of first preferred embodiment pumpback and needle body is described.

Fig. 7 is a cutaway view, illustrates that the another kind of this spigot and this needle stand in this first preferred embodiment is implemented aspect.

Fig. 8 is a cutaway view, illustrates that the present invention one has second preferred embodiment of the syringe of back-suction.

Fig. 9 is a cutaway view, and this this needle stand of second preferred embodiment pumpback and this needle body is described.

Figure 10 is a cutaway view, illustrates that the another kind of this spigot and this needle stand in this second preferred embodiment is implemented aspect.

Figure 11 is a cutaway view, illustrates that the present invention one has the 3rd preferred embodiment of the syringe of back-suction.

Figure 12 is a cutaway view, illustrates that the 3rd preferred embodiment pushes this needle stand front end rigion and enter in this wide section of putting and unload this spigot.

Figure 13 is a cutaway view, and the 3rd this needle stand of preferred embodiment pumpback and this needle body is described.

Figure 14 is a cutaway view, illustrates that the another kind of a cork in the 3rd preferred embodiment is implemented aspect.

Figure 15 is a cutaway view, illustrates that the another kind of the 3rd this spigot of preferred embodiment is implemented aspect.

Figure 16 is a cutaway view, illustrates that the present invention one has the 4th preferred embodiment of the syringe of back-suction.

Figure 17 is a cutaway view, and the 4th this needle stand of preferred embodiment pumpback and this needle body is described.

Figure 18 is a cutaway view, illustrates that the another kind of this spigot in the 4th preferred embodiment is implemented aspect.

Figure 19 is a part of cutaway view, illustrates that the 4th preferred embodiment pushes this needle stand front end rigion and enter in this wide section of putting and unload this spigot.

Figure 20 is a part of cutaway view, illustrates that the present invention one has the 5th preferred embodiment of the syringe of back-suction.

Figure 21 is a cutaway view, and the 5th this needle stand of preferred embodiment pumpback and this needle body is described.

Figure 22 is a cutaway view, illustrates that the another kind of this spigot in the 5th preferred embodiment is implemented aspect.

Figure 23 is a cutaway view, illustrates that the present invention one has the 6th preferred embodiment of the syringe of back-suction.

Figure 24 is a cutaway view, illustrates that the present invention one has the 7th preferred embodiment of the syringe of back-suction.

Figure 25 is a cutaway view, illustrates that the present invention one has the 8th preferred embodiment of the syringe of back-suction.

[specific embodiment]

Before the present invention is described in detail, be noted that in the following description similar elements is to represent with identical numbering.

As Fig. 1, Fig. 2, first preferred embodiment that the present invention has the syringe of back-suction comprises a syringe 1, a syringe needle group 2, a locating part 3, a push rod 4 and a pumpback device 5.

This syringe 1 have around an axis X and define a macropore 11 and an aperture road 12 a surrounding wall 13, be connected this macropore 11 and this aperture road 12 and do not have the camber taper seat 14 that a stage differs from, and be formed on several spacer fins 15 on this camber taper seat 14, and give prominence to macropore 11 in and be close to the ring rib 16 in this hole, trail 12 by this surrounding wall 13.This surrounding wall 13 has a reverse port of export 131 and an arrival end 132.This aperture road 12 has a locating hole section 121 in abutting connection with this camber taper seat 14 and these spacer fins 15, is slightly larger than a wide section of putting 122 of this locating hole section 121 in abutting connection with this locating hole section 121 and aperture, in abutting connection with this wide section of putting 122 and this port of export 131 and aperture less than a pin hole section 123 of this wide section of putting 122, and be formed on the shoulder 124 of 123 of this wide section of putting 122 and this pin hole sections.

This syringe needle group 2 has a fixed needle stand 21 and a needle body 22 mutually.This needle stand 21 is the tubular structure of metal material at present embodiment, and has fixing at the front end rigion 211 of these spacer fins 15 with this locating hole section 121, and is set in a rear end section 212 of this macropore 11.This needle body 22 is to be cemented in this needle stand 21 and by this pin hole section 123 to pass this syringe 1 with this port of export 131.

This locating part 3 is in the airtight macropore 11 that is packed in this syringe 1, and engages the location with this ring rib 16, this locating part 3 and have along this axis X direction run through and with the localized perforation 31 of these needle stand 21 rear end section 212 airtight fits.

This push rod 4 is can slide against in the macropore 11 of this syringe 1, and has around this axis X and define tube wall 42, a piston 43, an end cap 44 of a tube chamber 41.This tube wall 42 has towards a front end face 421 of this locating part 3 and open this tube chamber 41, be in reverse to a rear end face 422 of this front end face 421 and open this tube chamber 41, tubule footpath section 423 in abutting connection with this front end face 421, big caliber section 424 in abutting connection with this tubule footpath section 423, the enlarged cavity section 425 that this big caliber section 424 of adjacency and this rear end face are 422, it is big to be formed on this, tubule footpath section 424, a shoulder 426 of 423, be formed in this big caliber section 424 and a scrobicular ring 427 of contiguous this shoulder 426, a ring rib 428 that is formed on this big caliber section 424 and 425 of this enlarged cavity sections and extends along this axis X direction by this big caliber section 424, reach a steam vent 429 that runs through this enlarged cavity section 425 along parallel this axis X direction, make this tube chamber 41 can see through this steam vent 429 and be in communication with the outside, with in this push rod 4 of balance with extraneous air pressure.This piston 43 be nested with on this tubule footpath section 423 and with these syringe 1 surrounding wall 13 airtight contacts.This end cap 44 is upper shields in this enlarged cavity section 425 and this rear end face 422, and has an annular groove 441 chimeric with this enlarged cavity section 425.

This pumpback device 5 has a spigot 51 and and replys part, and this answer part is a drawing spring 52 at present embodiment.This spigot 51 is that detachable liftoff fixing is in these tube chamber 41 big caliber sections 424 and contiguous this shoulder 426, and have the back bolt section 511 that is contained in this big caliber section 424, be formed on this back bolt section 511 and with a bulge loop 512 of these scrobicular ring 427 relative engagings, pass this tubule footpath sections 423 and pass a preceding bolt section 513 of this push rod 4 along this axis X direction, reach by the thread segment 514 of this preceding bolt section 513 along this axis X direction extension by this back bolt section 511.This spring 52 has a pull back end 521 fixed with this back bolt section 511, and is nested with the positioning end 522 42 of this ring rib 428 and this tube walls.

Ginseng Fig. 3, when this push rod 4 is passed to the injection stroke terminal point, and after finishing the injection purposes, this push rod 4 can contact with locating part 3 with this piston 43, and places in the perforation 31 of this locating part 3 with the thread segment 514 of this spigot 51, and forms the interlock state of fixing with these needle stand 21 rear end section, 212 urgent plugging together, at this moment, user need only continue to pass this push rod 4, just can be in the process of these syringe 1 port of export 131 displacements at this push rod 4, push this locating part 3 and with the needle stand 21 of locating part 3 fits.

Ginseng Fig. 4, when this needle stand 21 is pushed, these needle stand 21 front end rigions 211 can enter this wide section of putting 122 to being hampered by this shoulder 124, whereby, can make with this locating hole section 121, and these spacer fins 15 be the needle stand 21 that fixes positioning states, in the process that is pushed, have an activity effect, and then remove the fixing state of this needle stand 21 and this syringe 1.At this moment, because these needle stand 21 front end rigions 211 are the further displacements of shoulder 124 that are hampered by this syringe 1, this locating part 3 also can be passed with this push rod 4, along this needle stand 21 towards these port of export 131 displacements, ginseng Fig. 5, this needle stand 21 is can't be under the situation of these syringe 1 port of export 131 further displacements, can be oppositely to push the spigot 51 that engages with this push rod 4 with these spigot 51 thread segments 514 urgent rear end section that plug together 212, make the fixing state of these spigot 51 bulge loops, 512 releasings and these tube wall 42 scrobicular rings 427, make this needle stand 21 unload this tube wall 42 synchronously with this spigot 51 together with this needle body 22.

Consult Fig. 6, whereby, this spring 52 can start contraction and discharge back stretch, and drives this spigot 51, this needle stand 21 and this needle body 22 towards tube chamber 41 big caliber section 424 intrinsic displacements with this end 521 of pulling back, and then this needle stand 21 and this needle body 22 are retained in this push rod 4.Make the syringe 1 that abandons to isolate this needle body 22 with this surrounding wall 13 and the tube wall 42 of this push rod 4, after the release medical personnel use conventional syringes, contact with needle body, cause danger injured, that infect because tidying up the syringe needle group.

What deserves to be mentioned is, because this needle stand 21 can be that metal material is made, therefore, the caliber of this needle stand 21 can contract to minimum, relative, this push rod 4 also just can cooperate with the caliber of this syringe 1 and dwindles, so, when this syringe 1 as Fig. 1 during to the medicine container as 1cc shown in Figure 5, be to extend suitable length along this axis X direction, the containing mark spacing that is formed on this syringe 1 strengthened, whereby, medical personnel can more accurate control agent capacity in this syringe 1, as the standard of injection medicament.

Ginseng Fig. 7, the present invention also can be applied in the syringe (as capacity 3cc, 5cc or the bigger syringe of capacity) of general capacity, that is to say, this syringe 1 has bigger caliber with this push rod 4, and this needle stand 21 can cooperate this push rod 4 to enlarge with this syringe 1 caliber, and with plastic rubber ejaculate molding be one can ccontaining this needle body 22 hollow tubular structure, and have a projection 213 that is formed on these needle stand 21 rear end section 212 and passes this locating part 3, and bolt sections 513 also have and are formed on a front end face 515 and towards a groove 516 of this needle stand 21 before this spigot 51.Whereby, this spigot 51 is to engage with the projection 213 of this needle stand 21 with this groove 516 to form interlock.

Ginseng Fig. 8, Fig. 9 are the present invention's second preferred embodiments, and this second preferred embodiment is the syringe (as the syringe of capacity 1cc) that is applied in minimum capacity equally, and itself and first preferred embodiment are roughly the same, difference be in:

This pumpback device 5 has a spigot 53 and and replys part, and this answer part is a kind of compression spring 54 at present embodiment.This spigot 53 has the back bolt section 531 that passes this spring 54 and be contained in these tube chamber 41 big caliber sections 424, be formed on a bolt head 532 that these bolt section 531 1 rear ends, back and detachable liftoff and this tube wall 42 fix, be formed on these bolt head 532 1 outer surfaces and can with scrobicular ring 427 corresponding bulge loops 533 that engage in these tube wall 42 big caliber sections 424, and by this back bolt section 531 along this axis X direction extension and pass directly sections 423 a preceding bolt section 534 and a thread segment 535 of tube wall 42 tubules.This spring 54 has an abutment end 541 that is resisted against on this shoulder 426, and be in reverse to this abutment end 541 and be forced in one of this bolt head 532 bounce up the end 542.

When this push rod 4 compels to squeeze this locating part 3 towards the port of export 131 displacements, and when discharging these needle stand 21 rear end section 212, equally can be with the thread segment 535 and these needle stand 21 rear end section 212 urgent formation interlocks that plug together of this spigot 53, and push these needle stand 21 front end rigions 211 and enter this wide section of putting 122 to being hampered by this shoulder 124, at this moment, this needle stand 21 can be disengaged equally with the location fixing state of this syringe 1, this spigot 53 also can be disengaged with the concretion state of this tube wall 42 simultaneously, and start the elastic-restoring force of this spring 54, at this moment, 542 meeting elastic stretch and these spigots 53 of pushing and withstanding are held in bouncing up of this spring 54, make these spigot 53 these needle stands 21 of drive and this needle body 22 towards tube chamber 41 big caliber section 424 intrinsic displacements, and then this needle stand 21 is retained in this push rod 4 with this needle body 22.

Ginseng Figure 10, this second preferred embodiment equally also can be applied in the syringe of general capacity (as capacity 3cc, the syringe that 5cc or capacity are bigger), that is to say, this syringe 1 has bigger caliber with this push rod 4, and this needle stand 21 can cooperate this push rod 4 to enlarge with this syringe 1 caliber, and with plastic rubber ejaculate molding be one can ccontaining this needle body 22 hollow tubular structure, and have rear end section of being formed on 212 and pass a projection 213 of this locating part 3, and this spigot 53 also has the front end face 536 that is formed on this preceding bolt section 534 and towards a groove 537 of this needle stand 21.Whereby, this spigot 53 is to engage with the projection 213 of this needle stand 21 with this groove 537 to form interlock.

Ginseng Figure 11 is the present invention's the 3rd preferred embodiment, and the 3rd preferred embodiment is the syringe (as the syringe of capacity 1cc) that is applied in minimum capacity equally, and itself and first preferred embodiment are roughly the same, difference be in:

This push rod 4 also has an O type ring 45, and does not have steam vent to exist.This O type ring 45 is 441 of annular grooves that are contained in these tube wall 42 rear end faces 422 and this end cap 44.

This pumpback device 5 also has a cork 55, and this spigot 51 also has by this back bolt section 511 along this axis X direction a tightening latch 517 that extends and a head 518 that is formed on these tightening latch 517 1 rear ends.This cork 55 is airtight being nested with on this tightening latch 517 and this head 518, and with these tube wall 42 airtight contacts, and and 44 of this O type ring 45 and this end caps form a gastight tube chamber 41 spaces.This answer part is one to be formed on the utmost point low pressure in this push rod 4 airtight tube chambers 41.

Ginseng Figure 12, Figure 13, when this push rod 4 and this piston 43 compel to squeeze this locating part 3 towards the port of export 131 displacements, and when discharging these needle stand 21 rear end section 212, equally can be with the thread segment 514 and these needle stand 21 urgent formation interlocks that plug together of this spigot 51, and push these needle stand 21 front end rigions 211 and enter this wide section of putting 122 to being hampered by this shoulder 124, at this moment, this needle stand 21 can be disengaged equally with the fixing state of this syringe 1, this spigot 51 also can be disengaged with the concretion state of this tube wall 42 simultaneously, make air pressure flow to this extremely hypobaric tube chamber 41 and produce back-suction, and can and be accommodated in the tube chamber 41 of push rod 42 pumpbacks of syringe needle group by the external world.

Ginseng Figure 14, the cork 55 among the 3rd embodiment also can be as shown in the figure, has a flat end face 551, whereby, the elasticity nargin in the time of can promoting these cork 55 compressions.

Ginseng Figure 15, the 3rd preferred embodiment equally also can be applied in the syringe (as capacity 3cc, 5cc or the bigger syringe of capacity) of general capacity, that is to say, this syringe 1 has bigger caliber with this push rod 4, this needle stand 21 can cooperate this push rod 4 to enlarge with this syringe 1 caliber, and with plastic rubber ejaculate molding be one can ccontaining this needle body 22 hollow tubular structure, and have a projection 213 that is formed on this rear end section 212.And bolt sections 513 also have and are formed on front end face 515 and towards a groove 516 of this needle stand 21 before this spigot 51, reach with this tightening latch 517 and generally be the T type and compel to support a head 519 of locating this cork 55, this cork 55 is airtight being nested with on this tightening latch 517, and with these tube wall 42 airtight contacts.Whereby, this spigot 51 can engage with the projection 213 of this needle stand 21 with groove 513 equally and forms interlock, and this cork 55 equally can and this O type ring 45 and 44 of this end caps form one airtight and have extremely hypobaric tube chamber 41 spaces.

Ginseng Figure 16, Figure 17 are the present invention's the 4th preferred embodiments, and the 4th preferred embodiment is the syringe (as capacity 3cc, 5cc or the bigger syringe of capacity) that is applied in larger capacity, and itself and the 3rd preferred embodiment are roughly the same, difference be in:

This push rod 6 have around this axis X and define a tube chamber 61 tube wall 62, be formed on these tube wall 62 1 outer surfaces and severals fins 63 of extending along this axis X direction, be nested with this tube wall 62 be close to front end faces 621 and with these syringe 1 surrounding wall 13 airtight pistons that contact 64, an end cap 65 and an O type ring 66.This tube wall 62 also have contiguous this front end face 621 tubule footpath section 622, in abutting connection with this tubule footpath section 622 and caliber be slightly larger than this tubule footpath section 622 middle caliber section 623, in abutting connection with should in caliber section 623 and caliber greater than the big caliber section 624 of caliber section 623 in this, in abutting connection with should big caliber section 624 and an enlarged cavity section 626 of these tube wall 62 1 rear end faces 625, and be formed on an annular linking edge 627 in this tubule footpath section 622.This end cap 65 be upper shield at these tube wall 62 rear end faces 625, and have an annular groove 651 chimeric with this enlarged cavity section 626 and this rear end face 625.This O type ring 66 is 651 of annular grooves that are contained in these tube wall 62 rear end faces 625 and this end cap 65.

This spigot 56 is urgent being positioned in this push rod 6 tubules footpath section 622, and have the shrinkage pool 562 that is formed on a front end face 561, be formed on an outer surface 563 and be connected an annular concave ditch 564 of edge 627 corresponding engagings with this push rod 6, and be formed on a rear end and protrude into the shrinkage part 565 in the caliber section 623 in this push rod 6, make this spigot 56 airtight fixed with this push rod 6 tubules footpath section 622.This answer part is one to be formed on the utmost point low pressure in this push rod 6 tube chambers 61, and be by these spigot 56 outer surfaces 563 and these push rod 6 tube walls 62 airtight contacts, and and this O type ring 66 and 65 formation of this end cap, one gastight utmost point low pressure tube chamber, 61 spaces, and this enlarged cavity section 626 can be according to the demand of back-suction, hold extremely hypobaric space to increase this tube chamber 61, strengthen this extremely hypobaric back-suction.

When this push rod 4 compels to squeeze this locating part 3 towards the port of export 131 displacements, and when discharging these needle stand 21 rear end section 212, equally can be with the shrinkage pool 562 of this spigot 56 and the projection 213 fixing formation interlocks of these needle stand 21 rear end section 212, and push these needle stand 21 front end rigions 211 and enter this wide section of putting 122 till be hampered by this shoulder 124, at this moment, this needle stand 21 can be disengaged equally with the location fixing state of this syringe 1, and the needle stand 21 that this can't move towards syringe 1 port of export 131, can oppositely push this spigot 56 with projection 213, this spigot 56 and the tubule footpath section 622 of this push rod 6 are unloaded.

After the urgent positioning states of this spigot 56 and this tube wall 62 tubules footpath section 622 is disengaged, can enter the bigger middle caliber section 623 of caliber, and continue with this outer surface 563 with should middle 623 of caliber sections keep airtight and slide displacement with lower frictional resistance, whereby, when air pressure is flowed to this extremely hypobaric tube chamber 61 and is produced back-suction by the external world, this spigot 56 together with this syringe needle group 2 can by and 623 formation of caliber section airtight in this, slide displacement with lower resistance, after entering this big caliber section 624 to this spigot 56, airtight conditions is removed, and can be with this spigot 56 together with these syringe needle group 2 pumpbacks and be accommodated in the tube chamber 61 of push rod 6, and this spigot 56 can be limited in together with this syringe needle group 2 in caliber section 623 and 624 of caliber sections greatly.

Ginseng Figure 18, Figure 19, the 4th preferred embodiment equally also can be applied in the syringe (as the syringe of capacity 1cc) of minimum capacity, and in moulding because of less some the elementary errors distance of size, and this spigot 56 has a gilled rings 566 that passes the expansion of these push rod 6 front end faces 621 and annular radial.Whereby, this gilled rings 566 is to replace piston 64, and with these syringe 1 surrounding wall 13 airtight contacts, make and syringe 1 forms airtight conditions.And when this spigot 56 unloads the tubule footpath section 622 of these push rod 6 tube walls 62, this ring rib 566 can contract and include in this tube wall 62, at this moment, ambient pressure can flow in this extremely hypobaric tube chamber 61 equally, and with this spigot 56 together with these syringe needle group 2 pumpbacks and be accommodated in the tube chamber 61 of this push rod 6.

The ginseng Figure 20, Figure 21, be the present invention's the 5th preferred embodiment, the 5th preferred embodiment and the 4th preferred embodiment are roughly the same, difference be in: this preferred embodiment also includes a sealing member 7.

Sealing part 7 has an elasticity airtight pad 71 of fixing in this syringe 1 wide section of putting 122, an and packing ring 72 that is resisted against 21 of the airtight pad 71 of elasticity and needle stands, make 3 of sealing part 7 and this locating parts define a compressible and gastight pressure accumulation space 73, accumulating in advance in this pressure accumulation space 73 has the fluid media (medium) that can produce predetermined pressure, and this fluid media (medium) can be that gas or liquid are wherein a kind of.And these needle stand 21 1 front end faces 215 are to be resisted against on the sealing part 7, and have a breach 214 that is communicated with this pressure accumulation space 73.

Whereby, when push rod 6 pushes these locating parts 3 towards these syringe 1 port of export 131 displacements, this locating part 3 and this needle stand 21 and 13 of this syringe 1 surrounding walls still can be kept airtight conditions, and can be with these spigot 56 fixed these needle stands 21, also can push simultaneously this needle stand 21, make the fixing state of removing this needle stand 21 and this syringe 1, also can make this spigot 56 unload this push rod 6 tube walls 62, simultaneously can compression fluid medium and the force value in the pressure accumulation space 73 are risen, form one channelling and go into the auxiliary propelling movement power of these needle stand 21 breach 214, and can assist the displacement of this spigot 56 and this needle stand 21, and the back-suction of the aforementioned utmost point low pressure formation of arranging in pairs or groups, make this spigot 56 drive this needle stand 21 and this needle body 22, pumpback more smoothly also is hidden in this push rod 6.

Ginseng Figure 22, the 5th preferred embodiment equally also can be applied in the syringe (as the syringe of capacity 1cc) of minimum capacity, and it is less because of size in moulding, this spigot 56 has a gilled rings 566 that passes these push rod 6 front end faces 621 and annular radial expansion, this gilled rings 566 is and these syringe 1 surrounding wall 13 airtight contacts to make with syringe 1 to form airtight conditions and replace piston 64.

What deserves to be mentioned is, sealing part 7 and this pressure accumulation space 73 also can be used in this first, second, each of the 3rd preferred embodiment implemented aspect, dispose the needle stand 21 that is communicated with this pressure accumulation space 73 with this breach 214 in these preferred embodiments, form the 6th, the 7th, the 8th preferred embodiment, the 6th, the 7th, the 8th preferred embodiment is respectively as Figure 23, Figure 24, shown in Figure 25, define a compressible and gastight pressure accumulation space 73 with sealing part 7 and 3 of this locating parts, whereby, back stretch (Figure 23) when utilizing this drawing spring 52 to shrink, or the back stretch (Figure 24) of these compression spring 54 bullets when opening, or these utmost point low pressure tube chamber 41 spatial back-suctions (Figure 25), cooperate the formed auxiliary propelling movement power of these pressure accumulation space 73 inner fluid media of compression, make this spigot 51 respectively, spigot 53 drives this needle stand 21 and this needle body 22, and pumpback more smoothly also is hidden in this push rod 6.

According to the above as can be known, the syringe with back-suction of the present invention has following advantages and effect:

1. the present invention need only be after injection be finished, and the lasting application of force pushes this push rod 4 (6), just can start This pumpback device 5, and utilize elastic force or attraction, this needle stand 21 is hidden in this push rod with this needle body 22 In 4 (6), reach the purpose of this needle body 22 of isolation, make the present invention utilize special structural design, simplify Assembly, promote the practicality of syringe and make the efficient of assembling, and reduce material, assembling, detection Cost.

2. when this needle stand 21 was pushed, these needle stand 21 1 front end rigions 211 can be by friction tight locating hole Section 121 enters the looser wide section of putting 122, whereby, can make the needle stand 21 that is the fixing state, at quilt In the process that promotes, have an activity effect, and then remove the fixing state of this needle stand 21, can promote Simplification and smoothness when this needle stand 21 and this needle body 22 pumpback.

3. because this needle stand 21 can be that metal material is made, therefore, the caliber of this needle stand 21 can contract To minimum, relative, this push rod 4 also just can cooperate with the caliber of this syringe 1 and dwindles, so, when This syringe 1 can extend suitable length during as the medicament container of 1cc, makes to be formed on this syringe 1 On the containing mark spacing strengthen, whereby, the medicine of medical personnel in can this syringe 1 of more accurate control The agent capacity, as the standard of injection medicament, security and practicality when promoting injection.

Claims (21)

1. syringe with back-suction comprises:

One syringe has the axis of centering on and defines a macropore and a surrounding wall in a little duct, and this surrounding wall has a reverse port of export and an arrival end;

One syringe needle group has a fixed needle stand and a needle body mutually, and this needle stand is a hollow tubular, and has a front end rigion, and a rear end section;

One locating part, airtight fixing and can be under external force towards this port of export displacements in the macropore of this syringe, and have along this axis direction run through and with the localized perforation of the airtight fit of this needle stand rear end section;

One push rod, become to be slidingly matched with the macropore of this syringe, and have around this axis and define the tube wall of a tube chamber, an and end cap, this tube wall has towards a front end face of this locating part and open this tube chamber, open this tube chamber and is in reverse to a rear end face of this front end face, and in abutting connection with a tubule of this front end face footpath section and a big caliber section in abutting connection with this tubule footpath section, this end cap upper shield is at this rear end face;

One pumpback device has this push rod front end face of detachable liftoff sealing and can overlap a solid spigot with this needle stand, and reach one and be contained in this tube chamber and the elastic answer part of tool,

It is characterized in that:

The little duct of this syringe also has a locating hole section in abutting connection with this macropore, in abutting connection with this locating hole section and aperture greater than a wide section of putting of this locating hole section, in abutting connection with this wide section of putting and this port of export and aperture less than a pin hole section of this wide section of putting, and be formed on this wide section of putting and the intersegmental shoulder of this pin hole

The front end rigion of the needle stand of this syringe needle group fixes in this locating hole section, and rear end section is set in this macropore, and this needle body is placed through this needle stand and passes this syringe by this pin hole section and this port of export.

2. the syringe with back-suction as claimed in claim 1 is characterized in that: this needle stand is that metal is made and in a tubular form.

3. the syringe with back-suction as claimed in claim 1, it is characterized in that: this spigot has and is contained in the back of one in the big caliber section of this push rod bolt section, is passed this push rod tubule footpath section and pass a preceding bolt section of this push rod along this axis direction by this back bolt section, and by the thread segment of this preceding bolt section along this axis direction extension, this thread segment passes this locating part and compels to squeeze and places in this needle stand, and this spigot and this pin base fastener are solidified as a whole.

4. the syringe with back-suction as claimed in claim 1, it is characterized in that: this needle stand also has a hollow convex column that is formed on this rear end section and passes this locating part, and this spigot has and is contained in the back of one in the big caliber section of this push rod bolt section, is passed this push rod tubule footpath section and pass a preceding bolt section of this push rod along this axis direction by this back bolt section, and be formed on a front end face of this preceding bolt section and towards a groove of this needle stand, this spigot engages so that the projection of this groove and this needle stand is relative, and this spigot and this pin base fastener are solidified as a whole.

5. as claim 3 or 4 described syringes with back-suction, it is characterized in that: this push rod tube wall also has a scrobicular ring that is formed in this big caliber section, and this spigot also has and is formed on this back bolt section and a bulge loop of relative engaging with this scrobicular ring.

6. the syringe with back-suction as claimed in claim 5, it is characterized in that: the answer part of this pumpback device is a drawing spring, this answer part have with this spigot after the fixed end of pulling back of bolt section, and be positioned at a positioning end of contiguous this push rod one rear end face, when this spring-actuated, this spring is pulled back end can elastic shrinkage and this spigot of pulling back, and makes this spigot drive this syringe needle group.

7. the syringe with back-suction as claimed in claim 6, it is characterized in that: this push rod also has an enlarged cavity section in abutting connection with this big caliber section and this tube wall rear end face, is formed on this big caliber section with this enlarged cavity is intersegmental and encircle rib by this big caliber section along one of this axis direction extension, and the location end ring of this spring of confession is put at this tube wall and this ring intercostal.

8. as claim 3 or 4 described syringes with back-suction, it is characterized in that: this push rod tube wall also has a scrobicular ring that is formed in this big caliber section, this spigot also has a bolt head that is formed on this bolt section rear end, back, and is formed on a bulge loop of this bolt head outer surface and relative engaging with this scrobicular ring.

9. the syringe with back-suction as claimed in claim 8, it is characterized in that: this push rod tube wall has also that to be formed on this tube chamber big, one shoulder of intersegmental and contiguous this front end face of little caliber, the answer part of this pumpback device is a compression spring, this spring has an abutment end that is resisted against on this shoulder, and be in reverse to one of this abutment end and bounce up end, this spigot passes this spring with this back bolt section, and urge this spring with this bolt head and bounce up end, this spring bounces up end meeting elastic stretch and this spigot of pushing and withstanding, makes this spigot drive this syringe needle group and is moved in the big caliber section of this tube wall.

10. the syringe with back-suction as claimed in claim 1 is characterized in that: this push rod also has a piston, and this piston is nested with on the section of this tubule footpath and the syringe surrounding wall is airtight contacts with this.

11. the syringe with back-suction as claimed in claim 1, it is characterized in that: this answer part is a kind of intraluminal utmost point low pressure of this push rod that is formed on, when this spigot is removed concretion state with this push rod tube wall, can make air pressure flow to tube chamber and produce back-suction, and can and be accommodated in the tube chamber of push rod the pumpback of syringe needle group by the external world.

12. the syringe with back-suction as claimed in claim 11 is characterized in that: this push rod also has an O type ring, and this end cap has an annular groove chimeric with this tube wall rear end face, and this O type ring is contained between the annular groove of this tube wall rear end face and this end cap.

13. the syringe with back-suction as claimed in claim 11, it is characterized in that: this pumpback device also has a cork, and this spigot have be contained in the back of one in the big caliber section of this push rod bolt section, by the tightening latch of this back bolt section along this axis direction extension, and be formed on the head of this tightening latch one rear end, this cork is nested with on this tightening latch and this head, and the push rod tube wall is airtight contacts with this.

14. the syringe with back-suction as claimed in claim 11, it is characterized in that: this pumpback device also has a cork, and this spigot has a tightening latch that is contained in the back of one in the big caliber section of this push rod bolt section, is extended and supply this cork to be nested with along this axis direction by this back bolt section, and be formed on this tightening latch one rear end and urge a head of locating this cork, this cork is airtight to be nested with on this tightening latch, and the push rod tube wall is airtight contacts with this.

15. the syringe with back-suction as claimed in claim 11, it is characterized in that: this needle stand also has a projection that is formed on this rear end section, this push rod has an annular that is formed in this tubule footpath section and is connected edge, and this spigot also have be formed on a front end face and towards a shrinkage pool of this needle stand, be formed on an outer surface and be connected an annular concave ditch of the corresponding engaging of edge with this push rod, and be formed on the shrinkage part of a rear end, this spigot engages with the protruding bolt of this needle stand with this shrinkage pool, and the push rod tube wall is airtight contacts with this with this outer surface.

16. the syringe with back-suction as claimed in claim 15 is characterized in that: this spigot also has a gilled rings that passes the expansion of this push rod front end face and annular radial, and the syringe surrounding wall is airtight contacts with this for this gilled rings.

17. the syringe with back-suction as claimed in claim 15, it is characterized in that: this push rod tube wall also have in abutting connection with this tubule footpath section and this big caliber section one in the caliber section, after the urgent positioning states of this spigot and this tube wall tubule footpath section is disengaged, can enter the bigger middle caliber section of caliber, and continue with this outer surface with should in caliber is intersegmental keeps airtight and slide displacement with lower frictional resistance, after entering this big caliber section to this spigot, airtight conditions is removed.

18. the syringe with back-suction as claimed in claim 1, it is characterized in that: this syringe also has a sealing member, the sealing part has an elasticity airtight pad of fixing in the wide section of putting of this syringe, an and packing ring that is resisted against between airtight pad of elasticity and needle stand, make and define a sealing and a compressible pressure accumulation space between sealing part and this locating part, this needle stand front end face is resisted against on the sealing part, and has a breach that is communicated with this pressure accumulation space, accumulate in advance in this pressure accumulation space the fluid media (medium) that can produce predetermined pressure is arranged, when push rod pushes this locating part towards this syringe port of export displacement, can compression fluid medium and the force value the pressure accumulation space in is risen, form the auxiliary propelling movement power of one this needle stand of passing in the push rod.

19. the syringe with back-suction as claimed in claim 18 is characterized in that: the fluid media (medium) in this pressure accumulation space is gas or liquid.

20. the syringe with back-suction as claimed in claim 1, it is characterized in that: this syringe also has and connects this macropore and this little duct and do not have the camber taper seat that a stage differs from, and being formed on several spacer fins on this camber taper seat, this needle stand is located in this spacer fin clamping.

21. the syringe with back-suction as claimed in claim 1 is characterized in that: this push rod also has in abutting connection with an enlarged cavity section of this big caliber section and this tube wall rear end face.

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