CN208838767U - A kind of syringe with fine filtering function - Google Patents

Abstract

The utility model discloses a kind of syringes with fine filtering function, including syringe and core bar, and syringe inner cavity front end is provided with filter device, including upper cover and lower cover, there is one section of filtrate chamber between upper and lower covers；A piece of micron order liquid medicine filtering membrane and a piece of floating type check valve film are provided in filtrate chamber；Lower cover is provided with deflector hole boss, and micron order liquid medicine filtering membrane is set to filtrate chamber bottom, and lower cover is provided with flow guiding structure and is drained to medical fluid in the center deflector hole；Floating type check valve film is moved up and down between deflector hole boss and upper cover to play closing and open the fluid course of floating type check valve film and deflector hole boss matching part.If the central part that floating type check valve film and center deflector hole upper opening match is provided with dryvalve film filtering through-hole.The syringe construction of the utility model is unique, reasonable, can effectively filter out the impurity in medical fluid in extraction, liquid medicine injection, provide safest filter effect.

Description

A kind of syringe with fine filtering function

Technical field

The utility model relates to a kind of Medical Devices more particularly to a kind of syringes.

Background technique

Syringe is a kind of common medical instruments.Early in the 15th century, Italian's Ka Di Nellie just proposes syringe Principle.Gas or liquid are mainly extracted or injected with syringe needle.

The medical fluid that syringe is needed for medical treatment to patient injection is being a kind of very universal medical procedure now,

The appearance of syringe is the once epoch-making revolution of medical instruments field, is extracted or is infused with syringe and syringe needle This process for entering medical fluid is called injection.Syringe is had the syringe and matching piston core of aperture and nipple by front end Bar composition is used to extract a small amount of medical fluid from medicine bottle first, is then injected into the position of human body needs.When core bar pulls out When out, medical fluid is sucked through syringe needle from the aperture of syringe front end nipple；Medical fluid is passed through into syringe needle from nipple aperture when core bar push-in Into tissue.

And when we extract medical fluid from medicine bottle, some air are adulterated, inevitably in order to remove injection Air in device is to avoid embolism, and syringe is inverted, is gently beaten by we, then pushes core bar, and discharge has the medicine of air Liquid.

It is understood that medical fluid is not pure, wherein always there are various impurity, however syringe injection Medical fluid often be directly entered blood blood vessel, these impurity once enter human vas will be brought to human body it is irreversible Injury.With medical advances, this risk that may be present in injection also increasingly attracts people's attention, and how to remove Impurity in these medical fluids becomes people problem urgently to be resolved.

Utility model content

The technical problem to be solved by the utility model is to provide a kind of unique structures, reasonable syringe, can take out Take, liquid medicine injection when, effectively filter out the impurity in medical fluid.

The utility model to solve above-mentioned technical problem and the technical solution adopted is that:

A kind of syringe with fine filtering function has the syringe and piston core pin of hollow nipple, cream including front end Nipple mesoporous is equipped in head；The front end of the syringe inner cavity is provided with a filter device, the filter device surrounding and institute The inner wall for stating syringe matches sealed connection, comprising: the upper cover and lower cover being fixedly connected have one section between the upper cover and lower cover Filtrate chamber；A piece of micron order liquid medicine filtering membrane and a piece of floating type check valve film are provided in the filtrate chamber；

It is provided with a deflector hole boss on the upper surface of the lower cover, is provided centrally in one in the deflector hole boss Heart deflector hole penetrates through the filtrate chamber and nipple mesoporous；

The micron order liquid medicine filtering membrane is set to the filtrate chamber bottom and the lower cover upper end face paste It closes, and is formed and be tightly connected between its edge and the lower cover；It is distributed on the micron order liquid medicine filtering membrane uniformly distributed Micron filter hole, the lower cover, which will be provided with flow guiding structure, to be drawn by the filtered medical fluid of micron order liquid medicine filtering membrane It flow in the center deflector hole；

The floating type check valve film is set between the deflector hole boss and upper cover, the floating type check valve The lower end surface of film and the upper surface shape of deflector hole boss match, and the floating type check valve film can be in the deflector hole boss It is moved up and down between upper cover to play closing and open the liquid of the floating type check valve film and deflector hole boss matching part The effect of circulation road can be sealed when the upper surface of the floating type check valve film and deflector hole boss fits and be closed at this Fluid course；If being provided in the outer ring portion that the floating type check valve film diameter is greater than the center deflector hole upper opening diameter Dry through-hole circulates in order to which medical fluid extracts；

The upper cover is provided with several upper cover through-holes in order to the circulation of medical fluid；The projected area of the upper cover through-hole it Be greater than the floating type check valve film on through-hole the sum of projected area, when in order to push the piston core pin liquid medicine injection The floating type check valve film can be smoothly mobile to lower cover by medical fluid promotion in time, described floating type unidirectional to close The fluid course of valve film and deflector hole boss matching part；

The syringe further includes hand-held part；

The side of the syringe is equipped with a shrinkage pool；

The hand-held part includes the first component and second component, and the first component is fixedly connected with second component；

The second component size is mutually matched with the shrinkage pool, and the second component is connected to described across the shrinkage pool Piston core pin, by pulling the first component and driving the second component to pull the piston core pin；

The barrel inside surface is equipped with two pieces of elastic slices, the elastic slice position it is opposite and between be equipped with gap.

Further, the central part that the floating type check valve film and the center deflector hole upper opening match is arranged If there is dryvalve film to filter through-hole.

Further, valve film filtering through-hole is nanofiltration through-hole

Further, it is set to the flow guiding structure of the lower cover are as follows: match with the micron order liquid medicine filtering membrane Position be provided with lower cover annular groove, filter membrane support protrusion is provided in the lower cover annular groove to support the micron Grade liquid medicine filtering membrane, the lower cover annular groove is to guarantee that it is enough that the micron order liquid medicine filtering membrane is formed during filtrate Effective filtration area；The lower cover is provided with several lower cover through-holes in lower cover annular groove position in order to the stream of filtrate It is logical；The bottom surface of the lower cover lower end surface and the syringe inner cavity fits, in the lower cover through-hole on the lower end surface of the lower cover Diversion trench connection is provided between the deflector hole of center, thus by the lower cover annular groove, lower cover through-hole and diversion trench structure At the flow guiding structure.

Further, the upper cover lower end surface is being provided with upper cover annular with the floating type matched position of check valve film Groove, is provided with valve film support protrusion in the upper cover annular groove, and the upper cover annular groove is described floating type to guarantee Check valve film forms enough effective aisle spares during extracting medical fluid；Several upper cover through-holes are set to the upper cover Center and upper cover annular groove position.

Further, sealing ring is equipped between the syringe and piston core pin, for ensuring leakproofness.

Further, the gap spacing between the elastic slice is less than the diameter of the piston core pin.

The syringe construction with micro porous filtration function of the utility model is unique and the ingenious upper cover by being fixedly connected The filtrate chamber of a unique texture is constituted with lower cover, is provided with micron order liquid medicine filtering membrane on the upper surface of lower cover in cavity, Play the role of effective secondary filter in liquid medicine injection；And deflector hole boss is arranged by lower cover upper surface, it is floating type unidirectional Valve film moves up and down between setting upper cover and deflector hole boss, opens center deflector hole upper opening channel when so that extracting medical fluid, And designed by reasonable ground structure so that push core bar liquid medicine injection in a flash can closing center's deflector hole upper opening liquid Circulation road, it is ensured that micron order secondary filter effective and stable can play a role in the overall process of injection.

When syringe extracts medical fluid, medical fluid is washed open after nipple mesoporous, center deflector hole described floating type by syringe needle Check valve film keeps it mobile to upper cover, that is, opens the fluid course of center deflector hole upper opening, medical fluid continues on through floating type list It is flowed into inside syringe to the through-hole in valve film outer ring portion with the through-hole for being set to upper cover.

When syringe liquid medicine injection, the piston core pin is pushed, because of upper the sum of the projected area for covering through-hole Greater than the sum of the projected area of through-hole in the floating type check valve film, so pushing core bar in a flash, the floating Formula check valve film can be smoothly mobile to lower cover in time under the action of downward pressure, is fitted in the deflector hole boss The fluid course of the upper opening of the center deflector hole is closed on upper surface.At this point, the medical fluid can then pass through it is described micro- After the filtering of meter level liquid medicine filtering membrane, the flow guiding structure through lower cover injects outward through center deflector hole, through nipple mesoporous and syringe needle.

Simultaneously, it has been found that in the region on the top of center deflector hole, we when extracting medical fluid terminates to start injection, It has one section of medical fluid (impurity gas and impurity may also be returned) to be trapped at this, after floating type check valve film is closed, at this Medical fluid dead angle is formed, this part medical fluid certainly will not be by filtering, and because this is in floating type check valve film and closes it After will form negative pressure state, this part medical fluid is propelled sub-fraction certainly and can not be emptied in the emptying before general injection, and In real injection process, the filtered medical fluid in this part then can " slow release " follow normal injection to enter human body, from And bring some potential safety problems.

So we have further dexterously opened up several nano through holes in the central part of floating type check valve film, this When sample is either extracted or propelled, the floating that all will not influence floating type check valve film opens and closes opens in the deflector hole of center The fluid course of mouth, but when low dose ofly we need to propel emptying medical fluid of the fraction containing gas before real injection When, the discharge of one small flow filtrate will be generated into center deflector hole in the central part of floating type check valve film, thus will before The low dose of the medical fluid dead angle stated before the injection is propelled to be excluded in time in operation, and it is hidden also just to effectively remove safety Suffer from, so that the secondary filter rate of medical fluid is further improved, the safety of injection obtains bigger promotion again.In addition, needle Tube inner surface is equipped with two pieces of elastic slices, elastic slice position it is opposite and between be equipped with gap, gap spacing is less than the diameter of piston core pin, Piston core pin can be prevented to be misused propulsion.

Detailed description of the invention

In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property It puts, is also possible to obtain other drawings based on these drawings.

Fig. 1 is the structural schematic diagram for the syringe that the utility model has fine filtering function.

Fig. 2 is the partial enlarged view in the portion C in Fig. 1.

Fig. 3 a, Fig. 3 b, Fig. 3 c are superstructure schematic diagram, and wherein Fig. 3 a is top view, and Fig. 3 b is the A-A section view of Fig. 3 a Figure, Fig. 3 c are bottom view.

Fig. 4 a, Fig. 4 b, Fig. 4 c are lower cover structure schematic diagram, and wherein Fig. 4 a is top view, and Fig. 4 b is the B-B section view of Fig. 4 a Figure, Fig. 4 c are bottom view.

Fig. 5 is the structural schematic diagram of floating type check valve film.

Fig. 6 is the structural schematic diagram of micron order liquid medicine filtering membrane.

Fig. 7 is the structural schematic diagram for the syringe that the utility model has fine filtering function.

In figure:

100 piston core pin 200 of syringe

101 nipple mesoporous 102 of nipple

Upper cover 300

301 upper cover annular groove 302 of upper cover through-hole

Valve film support protrusion 303

Lower cover 400

401 center deflector hole 402 of deflector hole boss

403 lower cover through-hole 404 of lower cover annular groove

405 filter membrane support protrusion 406 of diversion trench

The floating type check valve film 2 of micron order liquid medicine filtering membrane 1

500 second component 501 of the first component

Specific embodiment

Below with reference to the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear, complete Ground description,

Fig. 1, Fig. 2 shows a kind of syringes with fine filtering function, and the needle of hollow nipple 101 is had including front end Cylinder 100 and piston core pin 200, nipple 101 is interior to be equipped with nipple mesoporous 102；The front end of 100 inner cavity of syringe is provided with a mistake Filter device, the inner wall of the filter device surrounding and the syringe 100 matches sealed connection, and the filter device includes: The upper cover 300 and lower cover 400 being fixedly connected, there is one section of filtrate chamber between the upper cover 300 and lower cover 400；400 lower end of lower cover The bottom surface in face and 100 inner cavity of syringe fits.The upper cover 300 and lower cover 400 are by being set to the tubular of upper and lower end face Flange is fixed to each other grafting.

The Hermetical connecting structure that the filter device surrounding and 100 inner wall of syringe match are as follows: upper cover 300 it is upper End outer and the lower end outer of lower cover 400 are each provided with the cyclic annular evagination extended radially outward, so that upper cover 300 and lower cover 400 are capable of forming interference fit with the barrel of the syringe 100, to form Hermetical connecting structure, make medical fluid that can only pass through institute State disengaging in the filtrate chamber of filter device；Certain Hermetical connecting structure can also be using other conventional hermetic connections Structure, for example the whole barrel with the syringe 100 of the outer circumference surface of upper cover 300 and lower cover 400 forms interference fit etc..

It is provided with a piece of micron order liquid medicine filtering membrane 1 and a piece of floating type check valve film 2 in the filtrate chamber, such as schemes 5, shown in Fig. 6.

A deflector hole boss 401 is provided on the upper surface of the lower cover 400, at 401 center of deflector hole boss It is provided with a center deflector hole 402 and penetrates through the filtrate chamber and nipple mesoporous 102；

The micron order liquid medicine filtering membrane 1 is set to the filtrate chamber bottom and 400 upper surface of lower cover Fitting, and be fixed on the upper surface of the lower cover 400 by the pushing of the cylindrical flange of the upper cover 300, so that micron order medical fluid It is formed and is tightly connected between 1 edge of filter membrane and the lower cover 400；It is distributed on the micron order liquid medicine filtering membrane 1 uniformly distributed Micron filter hole, the lower cover 400 be provided with flow guiding structure will by the micron order liquid medicine filtering membrane 1 it is filtered Medical fluid is drained in the center deflector hole 402.

As shown in Fig. 4 a, Fig. 4 b, Fig. 4 c, be set to the flow guiding structure of the lower cover 400 are as follows: with the micron order The matched position of liquid medicine filtering membrane 1 is provided with lower cover annular groove 403, is provided with filter membrane in the lower cover annular groove 403 Support protrusion 406 is to support the micron order liquid medicine filtering membrane 1, and the lower cover annular groove 403 is to guarantee the micron order medicine Liquid filter membrane 1 forms enough effective filtration areas during filtrate；The lower cover 400 is in the lower cover annular groove 403 Position is provided with several lower cover through-holes 404 in order to the circulation of filtrate；On the lower end surface of the lower cover 400, in the lower cover Be provided between through-hole 404 and center deflector hole 402 diversion trench 405 connection, thus by the lower cover annular groove 403, under Lid through-hole 404 and diversion trench 405 constitute the flow guiding structure.

As shown in Fig. 3 a, Fig. 3 b, Fig. 3 c, the flow guiding structure of the lower cover 400 is also possible to other conventional knots certainly Configuration formula is for example not provided with diversion trench 405, but retains one section of clearance gap with 100 bottom of syringe in the lower cover 400 From so i.e. by between the lower cover annular groove 403, lower cover through-hole 404 and lower cover 400 and 100 bottom of the syringe Gap constitute the flow guiding structure.As long as the flow guiding structure that the lower cover 400 is arranged can will pass through the micron order medical fluid The filtered medical fluid of filter membrane 1 is drained in the center deflector hole 402.

The floating type check valve film 2 is set between the deflector hole boss 401 and upper cover 100, the floating The lower end surface of formula check valve film 2 and the upper surface shape of deflector hole boss 401 match, and the floating type check valve film 2 can be It is moved up and down between the deflector hole boss 401 and upper cover 100 to play closing and open the floating type check valve film 2 and lead The effect of the fluid course of 401 matching part of discharge orifice boss, it is upper when the floating type check valve film 2 and deflector hole boss 401 End face can seal the fluid course closed at this when fitting；It is greater than the center water conservancy diversion in the floating type check valve film diameter The outer ring portion of hole upper opening diameter is provided with several through-holes and circulates in order to which medical fluid extracts；

The upper cover 100 is provided with several upper cover through-holes 301 in order to the circulation of medical fluid；The upper cover through-hole 301 The sum of projected area is greater than the sum of the projected area of through-hole in the floating type check valve film 2, in order to push the piston core Floating type check valve film 2 described in when 200 liquid medicine injection of bar can be smoothly mobile to lower cover 400 by medical fluid promotion in time, To close the fluid course of the floating type check valve film 2 and 402 matching part of deflector hole boss.

300 lower end surface of upper cover is being provided with upper cover annular groove with the matched position of the floating type check valve film 2 302, it is provided with valve film support protrusion 303 in the upper cover annular groove 302, the upper cover annular groove 302 is to guarantee It states floating type check valve film 2 and forms enough effective aisle spares during extracting medical fluid；Several upper cover through-holes 301 are set It is placed in the center and 302 position of upper cover annular groove of the upper cover 300.

If the central part that the floating type check valve film 2 and 402 upper opening of center deflector hole match is provided with Dry nanometer step valve film filters through-hole.Certainly nanometer step valve film filtering through-hole is also possible to a micron step valve film filtering through-hole Deng as long as it is with effective filtration, i.e., during propulsive liquid, when the floating type check valve film 2 and deflector hole are convex When the fluid course of 401 matching part of platform is closed, the central part of the floating type check valve film 2 energy into center deflector hole 402 One small flow filtrate discharge is generated, the filtered medical fluid in the medical fluid dead angle on 402 top of center deflector hole is being injected Preceding low dose is propelled to be discharged in time in operation.

In addition, as shown in fig. 7, the syringe further includes hand-held part；The side of the syringe 100 is recessed equipped with one Hole；The hand-held part includes the first component 500 and second component 501, and the first component 500 is fixed with second component 501 to be connected It connects；501 size of second component is mutually matched with the shrinkage pool, and the second component 501 passes through the shrinkage pool and is connected to institute Piston core pin 200 is stated, by pulling the first component 500 and driving the second component 501 to pull the piston core Bar 200；And 100 inner surface of syringe is equipped with two pieces of elastic slices, the elastic slice position it is opposite and between be equipped with gap.It is described Gap spacing between elastic slice is less than the diameter of the piston core pin 200.Piston core pin 200 can be prevented to be misused propulsion.

Although the utility model is disclosed as above with preferred embodiment, so it is not intended to limit the utility model, any Those skilled in the art, without departing from the spirit and scope of the utility model, when can make a little modification and it is perfect, therefore this The protection scope of utility model, which is worked as, to be subjected to the definition of the claims.

Claims (7)

1. a kind of syringe with fine filtering function has the syringe and piston core pin of hollow nipple, nipple including front end It is interior to be equipped with nipple mesoporous；It is characterized by: being provided with a filter device, the filter device in the front end of the syringe inner cavity The inner wall of surrounding and the syringe matches sealed connection, comprising: the upper cover and lower cover being fixedly connected, the upper cover and lower cover it Between have one section of filtrate chamber；A piece of micron order liquid medicine filtering membrane and a piece of floating type check valve are provided in the filtrate chamber Film；

It is provided with a deflector hole boss on the upper surface of the lower cover, is provided centrally with a center in the deflector hole boss and leads Discharge orifice penetrates through the filtrate chamber and nipple mesoporous；

The micron order liquid medicine filtering membrane is set to the filtrate chamber bottom, is bonded with the lower cover upper surface, and And it is formed and is tightly connected between its edge and the lower cover；Uniformly distributed micron order is distributed on the micron order liquid medicine filtering membrane Filter hole, the lower cover, which will be provided with flow guiding structure, to be drained to institute by the filtered medical fluid of micron order liquid medicine filtering membrane In the center deflector hole stated；

The floating type check valve film is set between the deflector hole boss and upper cover, the floating type check valve film Lower end surface and the upper surface shape of deflector hole boss match, the floating type check valve film can the deflector hole boss with it is upper It is moved up and down between lid logical to play closing and the unlatching floating type check valve film and the liquid stream of deflector hole boss matching part The effect in road can seal the liquid stream closed at this when the upper surface of the floating type check valve film and deflector hole boss fits Channel；It is provided in the outer ring portion that the floating type check valve film diameter is greater than the center deflector hole upper opening diameter several logical It circulates in order to which medical fluid extracts in hole；

The upper cover is provided with several upper cover through-holes in order to the circulation of medical fluid；The sum of projected area of the upper cover through-hole is big In the sum of the projected area of through-hole in the floating type check valve film, when in order to push the piston core pin liquid medicine injection described in Floating type check valve film can smoothly be pushed in time by medical fluid and mobile to lower cover, to close the floating type check valve film With the fluid course of deflector hole boss matching part；

The syringe further includes hand-held part；

The side of the syringe is equipped with a shrinkage pool；

The hand-held part includes the first component and second component, and the first component is fixedly connected with second component；

The second component size is mutually matched with the shrinkage pool, and the second component passes through the shrinkage pool and is connected to the piston Core bar, by pulling the first component and driving the second component to pull the piston core pin；And

The barrel inside surface is equipped with two pieces of elastic slices, the elastic slice position it is opposite and between be equipped with gap.

2. as described in claim 1 with the syringe of fine filtering function, it is characterised in that: the floating type check valve If the central part that film and the center deflector hole upper opening match is provided with dryvalve film filtering through-hole.

3. as claimed in claim 2 with the syringe of fine filtering function, it is characterised in that: the valve film filters through-hole For nanofiltration through-hole.

4. the syringe as claimed in claim 1,2 or 3 with fine filtering function, it is characterised in that: be set to it is described under The flow guiding structure of lid are as follows: the matched position of micron order liquid medicine filtering membrane is being provided with lower cover annular groove, in institute It states and is provided with filter membrane support protrusion in lower cover annular groove to support the micron order liquid medicine filtering membrane, the lower cover annular groove To guarantee that the micron order liquid medicine filtering membrane forms enough effective filtration areas during filtrate；The lower cover is under described Bezel ring, connected in star position is provided with several lower cover through-holes in order to the circulation of filtrate；The lower cover lower end surface and the syringe inner cavity Bottom surface fit, be provided between the lower cover through-hole and center deflector hole on the lower end surface of the lower cover diversion trench company It is logical, to be made of the flow guiding structure the lower cover annular groove, lower cover through-hole and diversion trench.

5. as claimed in claim 4 with fine filtering function syringe, it is characterised in that: the upper cover lower end surface with The matched position of floating type check valve film is provided with upper cover annular groove, is provided with valve film in the upper cover annular groove Support protrusion, the upper cover annular groove, which is formed with to guarantee the floating type check valve film during extracting medical fluid, enough to be had Imitate aisle spare；Several upper cover through-holes are set to the center and upper cover annular groove position of the upper cover.

6. as described in claim 1 with the syringe of fine filtering function, it is characterised in that: the syringe and piston core pin Between be equipped with sealing ring, for ensuring leakproofness.

7. as described in claim 1 with the syringe of fine filtering function, it is characterised in that: the gap between the elastic slice Spacing is less than the diameter of the piston core pin.