There is the safety dispensation injection needle of unidirectional filtering functionTechnical field
The present invention relates to a kind of safe medical needling instrument, a kind of safety dispensation injection needle with unidirectional filtering function.
Background technology
At present, venous transfusion and injection are treatment meanss the most frequently used in medical treatment.Infusing
Before, it is often necessary to by formulated together with liquid of glucose or liquor for some powder.Specifically
Operational approach be: syringe is inserted in medicinal liquid bottle and extracts a small amount of medicinal liquid；Then note is extracted
Emitter is also inserted in powdered medicine bottle, and liquid medicine injection is entered in powdered medicine bottle；Treat that medicated powder is completely dissolved with medicinal liquid
After, then extract out in mixed liquor injection infusion bottle or direct suction injection tube.
But when stating Medicine adder for injection in actual use, during making up a prescription, when extracting lysate or medicinal liquid in ampulla bottle, these conventional powder, productions of water medicament, deposit and often produce some granules of 3 one 5 microns in transportation, such as crystalline solid microgranule, carbon black particle, additionally, due to delineate bottleneck with grinding wheel, the glass fragment produced when cracking bottleneck is easily fallen in medicine bottle；Solid medicated powder is when making up a prescription dissolving, owing to the operating time is short, the deliquescent difference of solid medicated powder, has partial particulate to fail to dissolve, meanwhile, when drug feeding device punctures rubber, easily makes rubber stopper damaged, produce rubber scraps and enter into the liquid.So, when using Medicine adder for injection extraction medicinal liquid, glass fragment, part medicated powder granule or rubber scraps are also drawn into.When carrying out venous transfusion or injection to patient, these chips or granule are directly entered in blood of human body, can block blood vessel with blood circulation, bring harm to patient body, even threat to life.Therefore, need Pharmaceutical to be filtered, to ensure safety during making up a prescription.Existing dispensation injection needle common practice is to arrange a defecator (such as filter membrane) in liquid-transport pipe-line to filter these solid medicine powder particles and rubber scraps etc., solid medicine powder particles and rubber scraps etc. can only be blocked in the side of defecator (such as filter membrane) by the dispensation injection needle of this structure, if reversely injected, it is blocked in the particulate matter of defecator (such as filter membrane) side, will reflux, bring harm to patient body；Other be also additionally arranged check valve with prevent flow backwards, these needle sets be only applicable to extract liquid medicine dispensation, it is impossible to be suitable for being reversed pushing away liquid simultaneously.
Summary of the invention
It is an object of the invention to provide a kind of safety dispensation injection needle with unidirectional filtering function being simultaneously suitable for drawing liquid and pushing away liquid to overcome the deficiencies in the prior art.
To achieve these goals, the invention discloses a kind of safety dispensation injection needle with unidirectional filtering function, including needle tubing, needle stand and defecator, needle tubing is fixed on the front end of needle stand, it is characterized in that: the medicine liquid channel of described needle stand is provided with defecator, described defecator is provided with mutually isolated drawing liquid passage and pushes away liquid passage, drawing liquid passage and the import and export pushing away liquid passage are all connected with medicine liquid channel, described push away liquid passage is provided with push away liquid one-way valve structures, described in push away the arrival end of liquid passage and be provided with filter membrane；Described drawing liquid passage is provided with drawing liquid one-way valve structures.
Compared with prior art, the present invention has the safety dispensation injection needle of unidirectional filtering function at drawing liquid with when pushing away liquid, medicinal liquid passes through drawing liquid passage respectively and pushes away liquid channel flow, and the impurity being filtered out during pushing away liquid is isolated in by filter membrane and pushes away liquid channel entrance end, it is ensured that drawing liquid and to push away liquid two-way the safest.
Below in conjunction with the accompanying drawings and specific embodiment the invention will be further described.
Accompanying drawing explanation
Accompanying drawing 1 is specific embodiment of the invention stereoscopic structural representation；
Accompanying drawing 2 is specific embodiment of the invention front view；
Accompanying drawing 3 is accompanying drawing 2 A-A structure sectional view；
Accompanying drawing 4 is accompanying drawing 3 I portion partial enlarged drawing；
Accompanying drawing 5 is one of specific embodiment of the invention exploded structural representation；
Accompanying drawing 6 is the two of specific embodiment of the invention exploded structural representation；
Accompanying drawing 7 is one of defecator specific embodiment exploded structural representation of the present invention；
Accompanying drawing 8 is the two of defecator specific embodiment exploded structural representation of the present invention；
Accompanying drawing 9 is defecator specific embodiment antero-lateral perspective structural representation of the present invention；
Accompanying drawing 10 is defecator specific embodiment rear perspective structural representation of the present invention；
Accompanying drawing 11 is defecator specific embodiment front view of the present invention；
Accompanying drawing 12 is accompanying drawing 11 B-B structure sectional view.
Detailed description of the invention
As shown in figures 1 to 6, the safety dispensation injection needle with unidirectional filtering function includes needle tubing 1, needle stand 2 and defecator 3, needle tubing 1 is fixed on the front end of needle stand 2, the medicine liquid channel of described needle stand 2 is provided with defecator 3, described defecator 3 is provided with mutually isolated drawing liquid passage and pushes away liquid passage, drawing liquid passage and push away the import and export of liquid passage and be all connected with medicine liquid channel, described in push away liquid passage is provided with and push away liquid one-way valve structures, described in push away the arrival end of liquid passage and be provided with filter membrane；Described drawing liquid passage is provided with drawing liquid one-way valve structures.
nullIn this specific embodiment，Such as Fig. 7、8 and Figure 11、Shown in 12，Described defecator 3 includes batching pig 301、Batching pig frame 302 and filter membrane 303，Described batching pig 301 is the cylindrical structural member of front and back's opening，Centre is provided with axial dividing plate 3011 and inner chamber is separated into left chamber and right chamber，Described left chamber is provided with an oblique dividing plate in the left side being obliquely installed 3012，One end of the oblique dividing plate in a described left side 3012 is connected towards one end of needle tubing 1 with axial dividing plate 3011，The other end chamber sidewall slope to the left of left oblique dividing plate 3012 connects and extends to the other end of batching pig 301，The oblique dividing plate in a described left side 3012、Space between left chamber sidewall and axially dividing plate 3011 pushes away liquid passage described in constituting，The junction of the oblique dividing plate in a described left side 3012 and axial dividing plate 3011 be provided with penetration outer end with the joint-cutting 3014 pushing away liquid passage constitute described in push away liquid check valve；Described right chamber is provided with an oblique dividing plate in the right side being obliquely installed 3013, one end of the oblique dividing plate in the described right side 3013 is connected with one end of axial dividing plate 3011 needle tubing 1 dorsad, the other end chamber sidewall slope to the right of right oblique dividing plate 3013 connects and extends to the other end of batching pig 301, the oblique dividing plate in the described right side 3013, space between right chamber sidewall and axially dividing plate 3011 constitutes described drawing liquid passage, the junction of the oblique dividing plate in the described right side 3013 and axial dividing plate 3011 is provided with the joint-cutting 3014 of penetration outer end and drawing liquid passage and constitutes described drawing liquid check valve, described batching pig 301 entirety is made up of soft elastic material.
Such as Fig. 9, shown in 10, described batching pig frame 302 is similarly the cylindrical structural member of before and after's opening, the endoporus of described batching pig frame 302 matches with the external diameter of batching pig 301, described batching pig frame 302 axial length is more than the axial length of batching pig 301, described batching pig 301 is arranged in batching pig frame 302, and the lateral wall of described batching pig 301 is liquid-tight with the medial wall of batching pig frame 302 is affixed setting, also proximate in described batching pig frame 302 rear end be provided with longitudinal baffle 3021 liquid-tight with axial dividing plate 3011 be connected to be separated into the back cavity of described batching pig frame 302 push away liquid back cavity 3023 and drawing liquid back cavity 3022.Described push away liquid back cavity 3023 and drawing liquid back cavity 3022 respectively with push away liquid passage and drawing liquid passage UNICOM, described filter membrane 303 is enclosed in the import pushing away liquid back cavity 3023.
As shown in figure 12, in order to reliably isolate and UNICOM, the middle part of the axial dividing plate 3011 in the middle of described batching pig 301 is bent to form a platform 3015 preferably through twice in opposite direction 90 °, being provided with, on the correspondence position of on the platform 3015 of described axial dividing plate 3011 and batching pig 301 two side, the groove 3016 matched with longitudinal baffle 3021, described longitudinal baffle 3021 front end fluid-tight engagement is plugged in groove 3016.
Such as Fig. 5, shown in 6, produce for convenience, described needle stand 2 is preferably made up of front needle seat 201 and rear needle stand 202, described needle tubing 1 is fixed on the front end of front needle seat 201, the rear end of described front needle seat 201 is provided with cylinder open cavity volume, the front end of described rear needle stand 202 is again provided with cylinder open cavity volume, described front needle seat 201 is relative with the cavity volume opening of rear needle stand 202 to be merged to form and is integrally formed needle stand 2, the cavity volume of described front needle seat 201 and rear needle stand 202 merges defecator 3 cavity volume constituting cylinder, the internal diameter of defecator 3 cavity volume matches with the external diameter of batching pig frame 302, described defecator 3 is arranged in defecator 3 cavity volume, wherein, the outer wall of batching pig frame 302 is liquid-tight with the medial wall of defecator 3 cavity volume to be affixed.
The operation principle of the safety dispensation injection needle originally with unidirectional filtering function is as follows: become the wedge shape that arrival end large outlet end is little to arrange with drawing liquid passage owing to pushing away liquid passage, batching pig 301 is made up of soft elastic material, when taking out medicinal liquid, in medicinal liquid batching pig 301 in needle tubing 1 enters defecator 3 cavity volume, the pressure of medicinal liquid pushes away liquid passage pressure from the lateral of left oblique dividing plate 3012, make to push away liquid closed check valve, and the pressure of medicinal liquid is from the outside side pressure of drawing liquid passage of right oblique dividing plate 3013, drawing liquid check valve is opened, after medicinal liquid can only flow into from drawing liquid passage and enter drawing liquid back cavity 3022, medicinal liquid is directly sucked in syringe；When pushing away medicinal liquid, same principle, drawing liquid closed check valve, pushing away liquid check valve to open, medicinal liquid filters entrance through the import department's filter membrane 303 pushing away liquid back cavity 3023 and pushes away liquid back cavity 3023 and push away in liquid passage, then pushes away liquid check valve through front end, release from needle tubing 1, if any impurity in syringe, impurity is hindered in syringe, completes injection.