Bi-directional filtered dispensation injection needleTechnical field
The present invention relates to a kind of safe medical needling instrument, especially a kind of bi-directional filtered dispensation injection needle.
Background technology
Currently, venous transfusion and injection are most common treatment means in medical treatment.Before being infused, it is often necessary to willSome pulvis and liquid of glucose or liquor are formulated together.Specifically operating method is：Syringe is inserted into medicinal liquid bottleExtract a small amount of liquid；Then it extracts syringe and is inserted into powdered medicine bottle, liquid medicine injection is entered in powdered medicine bottle；Wait for that medicinal powder is complete with liquidAfter fully dissolved, then extracts mixed liquor injection infusion bottle out or be directly pumped into injection tube.
But when stating Medicine adder for injection in actual use, during making up a prescription, when lysate or medicine in extraction ampulla bottleWhen liquid, some 3 one 5 microns particles are often will produce in these common powder, the production of water medicament, storage and transportational process,As crystalline solid particle, carbon black particle crack the glass fragment generated when bottleneck and are easy further, since delineating bottleneck with grinding wheelIt falls into medicine bottle；Solid medicinal powder is when making up a prescription dissolving, since the operating time is short, the deliquescent difference of solid medicinal powder, there is partGrain fails to dissolve, meanwhile, when doser punctures rubber, easily make rubber stopper damaged, generates rubber scraps into the liquid.ThisSample, when extracting liquid using Medicine adder for injection, glass fragment, part medicinal powder particle or rubber scraps are also drawn into.ToWhen patient carries out venous transfusion or injection, these clasts or particle are directly entered in blood of human body, can be blocked with blood circulationBlood vessel brings harm or even threat to life to patient body.Therefore, it needs to be filtered medicine company during making up a prescription, to protectCard safety.Existing dispensation injection needle common practice is one filter device of setting in liquid-transport pipe-line（Such as filter membrane）To thisA little solid medicinal powder particles and rubber scraps etc. are filtered, and the dispensation injection needle of this structure can only be by solid medicinal powder particle and rubberGlue clast etc. is blocked in filter device（Such as filter membrane）Side be blocked in filter device if when reversed injection（Such as filteringFilm）The particulate matter of side will flow back, and harm is brought to patient body；Other are also additionally arranged check valve to prevent from flowing backwards, thisA little needle sets are only applicable to extract liquid medicine dispensation, cannot be suitble to be reversed propulsive liquid simultaneously.
Invention content
It is an object of the invention to provide and a kind of suitable for drawing liquid and push away simultaneously for overcome the deficiencies in the prior artThe bi-directional filtered dispensation injection needle of liquid.
To achieve the goals above, the invention discloses a kind of bi-directional filtered dispensation injection needles, including needle tubing, needle stand and mistakeDevice is filtered, needle tubing is fixed on the front end of needle stand, it is characterised in that：Filter device is equipped in the medicine liquid channel of the needle stand, it is describedIt is equipped with mutually isolated drawing liquid channel and propulsive liquid channel in filter device, the inlet and outlet in drawing liquid channel and propulsive liquid channel are and liquidChannel connects, and the input end and drawing liquid channel outlet in the propulsive liquid channel are equipped with filter membrane, the import in the drawing liquid channelEnd is equipped with check valve mechanism, and one-way valve structures are equipped in the propulsive liquid channel.
Compared with prior art, in drawing liquid and propulsive liquid, liquid passes through the bi-directional filtered dispensation injection needle of the present invention respectivelyDrawing liquid channel and the flowing of propulsive liquid channel, the impurity being filtered out during drawing liquid are isolated in the non-return at drawing liquid channel entrance endBetween valve system and the filter membrane of outlet end, and impurity is isolated in by filter membrane in syringe during propulsive liquid, ensure that pumpingThe safety of liquid and propulsive liquid.
Below in conjunction with the accompanying drawings and specific embodiment the invention will be further described.
Description of the drawings
Attached drawing 1 is specific embodiment of the invention stereoscopic structural schematic diagram；
Attached drawing 2 is specific embodiment of the invention front view；
Attached drawing 3 is 2 A-A structure sectional views of attached drawing；
Attached drawing 4 is 3 portions I partial enlarged view of attached drawing；
Attached drawing 5 is one of specific embodiment of the invention exploded structural schematic diagram；
Attached drawing 6 is specific embodiment of the invention exploded second structural representation；
Attached drawing 7 is one of filter device specific embodiment exploded structural schematic diagram of the present invention；
Attached drawing 8 is filter device specific embodiment exploded second structural representation of the present invention.Specific implementation mode
As shown in Figs 1-4, bi-directional filtered dispensation injection needle includes needle tubing 1, needle stand 2 and filter device 3, and needle tubing 1 is fixed onThe front end of needle stand 2 is equipped with filter device 3 in the medicine liquid channel of the needle stand 2, is equipped in the filter device 3 mutually isolatedThe inlet and outlet in drawing liquid channel and propulsive liquid channel, drawing liquid channel and propulsive liquid channel are connect with medicine liquid channel, the propulsive liquid channelInput end and drawing liquid channel outlet are equipped with filter membrane, and the input end in the drawing liquid channel is equipped with check valve mechanism, described to push awayOne-way valve structures are equipped in liquid channel.
As shown in Figure 7,8, in this specific embodiment, the filter device 3 includes batching pig 301,301 frame of batching pig and mistakeFilter membrane 303, the batching pig 301 include a bottom plate, and bottom plate one side center is equipped with vertical partition plate 3011, the vertical partition plateBottom plate is divided into left and right two parts, respectively drawing liquid bottom plate 3012 and propulsive liquid bottom plate 3013 by 3011, and the propulsive liquid bottom plate 3013 is setThere are opening, 3011 upper end propulsive liquid bottom plate of the vertical partition plate, 3013 side to be equipped with the transverse slat 3014 protruded horizontally up, the batching pig301 are made into integration by soft elastic material, such as medical grade rubber or silica gel；The batching pig frame 302 is similarly the front and back cylinder being openShape component, cross-sectional shape and size and the bottom plate of the batching pig frame 302 match.The bottom plate is preferably circular, it is described everyFrom the cylindrical structural member that plug frame 302 is front and back opening, 302 axial length of batching pig frame is more than the height of vertical partition plate 3011Degree so that longitudinal baffle 3021 is arranged containing space in inside.The vertical partition plate 3011 of the batching pig 301 is from batching pig frame 302Towards one end of needle tubing 1（Front end）It stretches into and is arranged in batching pig frame 302, and the bottom plate of the batching pig 301 and batching pig frame302 annular end faces are liquid-tight to be affixed, and 302 both ends end face of batching pig frame and inner wall want flat smooth, is conducive to improve leakproofness, verticallyThe two sides of partition board 3011 with 302 madial wall of batching pig frame is liquid-tight is affixed（The mode being slightly interference fitted can be taken）, describedThe 302 inner cavity other end of batching pig frame（It is preferred that being integrated）Equipped with longitudinal baffle 3021,3021 position of the longitudinal baffle with it is verticalPartition board 3011 is opposite, and the longitudinal baffle 3021 and 3011 position of vertical partition plate are preferably in center, the longitudinal baffle 3021Top offset with 3011 top of vertical partition plate, the other end of longitudinal baffle 3021 is flushed with 302 end of batching pig frame, described vertical302 inner cavity of batching pig frame is separated into equal two parts jointly to partition board 3021 and vertical partition plate 3011, with drawing liquid bottom3012 corresponding side of plate constitutes the drawing liquid channel, and side corresponding with propulsive liquid bottom plate 3013 constitutes the propulsive liquid channel.InstituteState propulsive liquid vias inner walls are flushed with transverse slat 3014 in batching pig frame 302 position be equipped with both ends extend to longitudinal baffle 3021,The baffle ring 3022 of protrusion, the transverse slat 3014, which is attached on 3022 end face of the baffle ring, constitutes the one-way valve structures, the isolationIt fills in frame 302 and the side wall of 3012 phase close neighbour of drawing liquid bottom plate is equipped with arc notch 3023, the setting of told arc notch 3023 so thatDrawing liquid side bottom plate again drawing liquid when have space for its opening, to open drawing liquid channel, the other side of drawing liquid side bottom plate is equipped withThe sealing surface 203 to match with drawing liquid bottom plate 3012 constitutes the check valve mechanism, the filter membrane 303 be enclosed in propulsive liquid channel intoOn mouth and drawing liquid channel outlet.
As shown in Figure 5,6, it produces for convenience, the needle stand 2 is preferably made of front needle seat 2 and rear needle stand 2, the needle tubing1 is fixed on the front end of front needle seat 2, and the rear end of the front needle seat 2 is equipped with cylinder open vessel, and opening vessel end face center is equipped withWith the through-hole of 1 unicom of front end needle tubing, the through-hole peripheral circular plane constitutes the sealing surface 203；The front end of needle stand 2 after describedIt is again provided with cylinder open vessel, the opposite merging of vessel opening of the front needle seat 2 and rear needle stand 2, which forms, is integrally formed needle stand2, the vessel merging of the front needle seat 2 and rear needle stand 2 constitutes cylindrical 3 vessel of filter device, the internal diameter of 3 vessel of filter deviceMatch with the outer diameter of batching pig frame 302, the filter device 3 is arranged in 3 vessel of filter device, wherein batching pig frame 302The madial wall of outer wall and 3 vessel of filter device is liquid-tight to be affixed.
The operation principle of this bi-directional filtered dispensation injection needle is as follows：When taking out liquid, liquid enters filter device by needle tubing 1In 3 vessels, propulsive liquid channel cannot be introduced into since the pressure of liquid makes 3014 liquid-tight phase of transverse slat be attached on 3022 end face of baffle ringThe other end, and under the pressure of liquid, drawing liquid bottom plate 3012 made of the soft elastic material is pressed towards arc notch 3023Side, and occur channel between the side wall of batching pig frame 302, liquid enters drawing liquid channel from the channel, using exitFilter membrane 303 filters, and impurity is hindered in drawing liquid channel, and liquid is inhaled into syringe, and after stopping drawing liquid action, liquid pressure disappearsIt loses, drawing liquid bottom plate 3012 restores that the sealing surface constituted with through-hole peripheral circular plane is liquid-tight to be affixed, and prevention liquid and impurity flow back；When pushing away liquid, due to drawing liquid bottom plate 3012 with through-hole sealing surface is liquid-tight is affixed, prevent liquid to be released from drawing liquid channel, liquid is onlyPropulsive liquid channel can be entered, filtered by filter membrane 303 at propulsive liquid channel entrance, then impurity is hindered in syringe, liquid entersPropulsive liquid channel, under the pressure of liquid, transverse slat 3014, which is open, opens check valve, using the opening on propulsive liquid bottom plate 3013,It is released again from needle tubing 1, completes injection.