CN205831804U - Internal fistula puncture blood collecting pin with check valve - Google Patents

Abstract

This utility model relates to the internal fistula puncture blood collecting pin of a kind of band check valve.Purpose is to provide the internal fistula puncture blood collecting pin of a kind of band check valve, and to solve blood taking needle and do not mate with puncture needle, dangerous, blood sampling volume is wayward and without the problem of anti-return measure.Including blood taking needle, conduit and puncture needle, conduit being provided with check valve, check valve includes housing and is arranged at the receiving float of intracavity, spool, support member and the elasticity part of housing；Float is arranged at housing and accommodates intracavity near blood entry port side, spool is arranged at buoy upper, offer connection housing in spool and accommodate the blood channel in chamber, support member is arranged at spool top, support member upper end is slidably connected with inner walls, support member lower end is fixing with spool to be connected, and elasticity part is arranged at the into the barrel chamber of support member and offsets with spool.Have the beneficial effects that: blood taking needle and puncture needle can with the use of, safety, blood sampling volume be easily controlled and be possible to prevent backflow.

Description

Internal fistula puncture blood collecting pin with check valve

Technical field

This utility model belongs to blood taking needle field, especially relates to the internal fistula puncture blood collecting pin of a kind of band check valve.

Background technology

At present, hemodialysis patients monthly to carry out the inspection of various blood sample, and venous blood collection is frequent, and blood sampling often needs Carry out repeatedly, but puncture blood test and bring the pain of health patient to be not intended to repeatedly puncture to carry out blood drawingization Test, thus common practice is to carry out taking a blood sample to reduce puncture blood collecting number of times while carrying out hemodialysis.

The blood collection procedure carried out during hemodialysis needs vein blood taking needle and internal fistula puncture needle with the use of, venous blood collection Pin inserts human body, and internal fistula puncture needle connects blood sampling test tube, but the vein blood taking needle used clinically and internal fistula puncture needle are not Joining, blood taking needle cannot be directly connected to internal fistula puncture needle, connects blood taking needle first with syringe often and enter when medical care person takes a blood sample Row takes blood, and blood is introduced in syringe by blood taking needle, then by internal fistula puncture needle, the blood in syringe is expelled to blood sampling In test tube.Above operational approach brings inconvenience to the work of health care workers, the most continually operation vein blood taking needle and Internal fistula puncture needle, brings the danger of pricking wound to health care workers, the bad grasp of blood sampling volume, and blood easily pollutes, and, adopt The device refluxed without anti-Hemostatic Oral Liquid during blood is to avoid blood to reflux.

Internal fistula of the prior art punctures special blood-drawing pin and there is a problem in that blood taking needle does not mates with puncture needle, no Safety, blood sampling volume are wayward and without anti-return measure.

Utility model content

The purpose of this utility model is to provide the internal fistula puncture blood collecting pin of a kind of band check valve, to solve in prior art Blood taking needle do not mate with puncture needle, dangerous, blood sampling volume is wayward and without the problem of anti-return measure.

The utility model discloses the internal fistula puncture blood collecting pin of a kind of band check valve, sequentially connect including along blood conveying direction Blood taking needle, conduit and the puncture needle connect, described conduit is provided with check valve, and described check valve includes housing and is arranged at housing Accommodate the float of intracavity, spool, support member and elasticity part；

Described float be arranged at housing accommodate intracavity near blood entry port side, described spool is arranged on described float Portion, offers connection housing and accommodates the blood channel in chamber in described spool, described support member is arranged at described spool top, institute Stating support member upper end to be slidably connected with described inner walls, described support member lower end is fixing with described spool to be connected, described Elasticity part is arranged at the into the barrel chamber of described support member and offsets with described spool.

Further, described housing includes input housing and outfan housing, described input housing and described defeated Go out end housing grafting.

Further, described input housing includes the first baffle plate and is arranged at the first set above described first baffle plate Cylinder, described outfan housing includes second baffle and is arranged at the second sleeve below described second baffle, described second sleeve With described first sleeve grafting.

Further, described first sleeve is provided with female thread, and described second sleeve is provided with external screw thread, and described first Sleeve and described second sleeve are spirally connected.

Further, it is provided with blood entry port in the middle part of described first baffle plate, in the middle part of described second baffle, is provided with blood Outlet.

Further, described support member includes connecting portion, retaining wall and the sliding part integrally connected, described sliding part and Described connecting portion is respectively arranged at the top and bottom of described retaining wall, and the inwall of described sliding part and the second sleeve is slidably connected, Described connecting portion one end is fixing with described spool to be connected, and the described connecting portion other end slides even with the inwall of described second sleeve Connect.

Further, described float lower end diameter is more than blood entry port diameter.

Further, it is provided with sealing ring bottom described housing receiving chamber.

Further, it is provided with gap between described float both sides and inner walls.

Further, described elasticity part is set to spring.

In conjunction with above technical scheme,

First aspect, blood taking needle and puncture needle are connected by conduit, it is to avoid blood collection procedure of the prior art must profit By the drawback of syringe；

Second aspect, check valve can be avoided blood to reflux, thus realize the good control to blood；

The third aspect, contacts without body surface in drainage process, and blood conveying is carried out the most in the duct, it is to avoid intersect sense Dye, uses safer.

In conjunction with three above aspect, the internal fistula puncture blood collecting pin of the band check valve that this utility model provides beneficial effect Be: blood taking needle and puncture needle can with the use of, safety, blood sampling volume be easily controlled and be possible to prevent backflow.

Accompanying drawing explanation

In order to be illustrated more clearly that this utility model detailed description of the invention or technical scheme of the prior art, below by right In detailed description of the invention or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, describe below In accompanying drawing be embodiments more of the present utility model, for those of ordinary skill in the art, do not paying creativeness On the premise of work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

The structural representation of the internal fistula puncture blood collecting pin of the band check valve that Fig. 1 provides for this utility model；

Fig. 2 is the structural representation of check valve；

Reference

1-check valve；2-housing；3-float；

4-spool；5-support member；6-elasticity part；

7-sealing ring；8-blood entry port；9-blood exports；

10-conduit；11-blood taking needle；12-puncture needle；

13-joint；21-input housing；22-outfan housing；

51-connecting portion；52-retaining wall；53-sliding part；

101-the first conduit；102-the second conduit；131-female joint；

132-male joint；211-the first baffle plate；212-the first sleeve；

221-the second sleeve；222-second baffle.

Detailed description of the invention

Below in conjunction with accompanying drawing, the technical solution of the utility model is clearly and completely described, it is clear that described Embodiment is a part of embodiment of this utility model rather than whole embodiments.Based on the embodiment in this utility model, this The every other embodiment that field those of ordinary skill is obtained under not making creative work premise, broadly falls into this practicality Novel protected scope.

In description of the present utility model, " " center ", " on ", D score, "left", "right", " perpendicular it should be noted that term Directly ", " level ", " interior ", the orientation of the instruction such as " outward " or position relationship be based on orientation shown in the drawings or position relationship, be only Must have specific for the ease of describing this utility model and simplification description rather than instruction or the device of hint indication or element Orientation, with specific azimuth configuration and operation, therefore it is not intended that to restriction of the present utility model.Additionally, term " the One ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that instruction or hint relative importance.

In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " peace Dress ", should be interpreted broadly " being connected ", " connection ", for example, it may be fix connection, it is also possible to be to removably connect, or integratedly Connect；Can be to be mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition Language concrete meaning in this utility model.

The utility model discloses the internal fistula puncture blood collecting pin of a kind of band check valve, sequentially connect including along blood conveying direction Conduit 10, blood taking needle 11 and the puncture needle 12 connect, conduit 10 is provided with check valve 1, and blood taking needle 11 is used for inserting human body skin, Puncture needle 12 is used for inserting blood sampling test tube, and conduit 10 connects blood taking needle 11 and puncture needle 12, and check valve 1 two ends are with conduit 10 even Logical.

Blood taking needle 11 includes blood taking needle syringe needle and for supporting the retainer of blood taking needle syringe needle, is provided with use in the middle part of retainer In the through hole of receiving blood taking needle syringe needle, in blood taking needle syringe needle, it is provided with the passage for blood conveying, and in blood taking needle syringe needle Transfer passage turns on conduit 10.Preferably, the material of blood taking needle syringe needle is stainless steel material, stainless steel material clean hygiene and There is certain intensity.Blood taking needle needle is sharp-pointed so that blood taking needle syringe needle inserts human body skin.The material of retainer can To be but not limited to PVC, as one of which preferably embodiment, retainer two ends are provided with all-wing aircraft to facilitate operator Hold.

For further improving the operational convenience of blood taking needle 11, the all-wing aircraft at retainer two ends can arrange movable patch, Movable patch includes that adhered layer and backing layer, movable patch one end are fixed on all-wing aircraft, and the other end is mutually pasted after folding.The program Facility swift to operate, pastes relatively stable.As the preferred size of activity patch, the width of movable patch is 3-5cm, the length of movable patch Degree is 3-9cm, and the thickness of movable patch is 0.5-1mm.As further scheme, activity is sticked and is arranged multiple air-vent, ventilative A diameter of 0.5-0.9mm in hole.

Puncture needle 12 includes that syringe needle and needle body, needle body end removably connect with conduit 10, and syringe needle inserts in blood sampling test tube. Can be but not limited to cylindrical structural in the middle part of needle body, offer the through hole for accommodating syringe needle in the middle part of needle body, syringe needle passes pin Internal through hole also connects with conduit 10, and needle body Main Function is supporting needle.For improving the intensity of puncture needle 12 with firm Property, needle body material is preferably arranged to PVC.

For further improving the convenience of puncture needle 12 operation, and improve the needle body intensity of puncture needle 12 further, Avoiding the lateral drift of puncture needle 12, further scheme, needle body both sides are provided with the protuberance for holding, the knot of protuberance Structure can be but not limited to rectangle or triangle.

Conduit 10 is arranged between blood taking needle 11 and puncture needle 12 for connecting blood taking needle 11 and puncture needle 12.Conduit 10 1 End and the retainer grafting of blood taking needle 11, retainer inserts in conduit 10, conduit 10 other end and the needle body grafting of puncture needle 12, Needle body inserts in conduit 10.Preferably, the material of conduit 10 is that PVC, PVC corrosion resistance is good, will not contaminated blood.

In the alternative of this embodiment, conduit 10 is provided with two sections, is first conduit of nearly blood taking needle 11 one end respectively 101 and second conduit 102 of nearly puncture needle 12 one end, connected by joint 13 between the first conduit 101 and the second conduit 102.

The reason arranging the first conduit 101 and the second conduit 102 is: in prior art, blood taking needle 11 and connection blood sampling First conduit 101 of pin 11 can be selected for existing product, but the first conduit 101 in existing product directly cannot connect with puncture needle 12 Connect, for improving the versatility of blood taking needle 11 of the prior art, be provided with the second conduit 102 connected with the first conduit 101, and First conduit 101 and the second conduit 102 are connected by joint 13.

For improving the stationarity of blood flowing in the first conduit 101 and the second conduit 102, it is ensured that be transported to blood sampling from human body Invisible spectro velocity of blood flow is steady, and the end of the second nearly puncture needle 12 of conduit 102 is provided with outwardly chamber.Specifically Bright as follows: according to bernoulli principle, the local flow velocity that blood is big in cross section is slow, and the local flow velocity little in cross section is fast, it is contemplated that The blood velocity ratio blood in conduit 10 flow velocity in chamber is fast, the blood flowed from blood taking needle 11 to puncture needle 12 direction First through the caching of chamber, the syringe needle then slow transitting through puncture needle 12 exports blood sampling test tube, and above technical scheme can be kept away Exempt from the velocity of blood flow at puncture needle 12 too fast, the problem that blood sampling volume is not easily controlled.

In the alternative of this embodiment, joint 13 still further comprises female joint 131 and male joint 132, female joint 131 Being arranged at the end of the first conduit 101, male joint 132 is arranged at the end of the second conduit 102.Male joint 132 and female joint 131 Being provided with receiving chamber, the connected mode of male joint 132 and female joint 131 can be but not limited to threaded or clamping. More preferably, male joint 132 and female joint 131 are threaded.

Specifically, the receiving intracavity of female joint 131 is provided with female thread, and male joint 132 is corresponding to the receiving of female joint 131 It is provided with external screw thread at the female thread in chamber.Male joint 132 and female joint 131 are by screwing and unscrew to reach to connect and unclamp Purpose.

Further supplementing as such scheme, in addition it is also necessary to explanation: the receiving intracavity of female joint 131 is provided with mother Joint mandrel, the receiving intracavity of male joint 132 is provided with male joint 132 mandrel, and female joint mandrel is internal with male joint mandrel all Being provided with blood channel, female joint mandrel and male joint mandrel grafting, male joint mandrel inserts in female joint mandrel.Blood carries Process is as follows: blood first flows through female joint 131, then flows through the receiving chamber of male joint mandrel and flows to through male joint 132 Puncture needle 12.

It is cylindrical structural as the alternative of such scheme, male joint mandrel and female joint mandrel, male joint mandrel It is set to rustless steel, to improve male joint mandrel and the corrosion resistance of female joint mandrel and resistance to the preferred material of female joint mandrel Hou Xing.

In this embodiment, carry out improving further to the structure of the first conduit 101, specifically, at the first conduit 101 arrange sacculus, sacculus both ends open near the side of blood taking needle 11, and sacculus two ends connect with the first conduit 101 respectively.Sacculus Preferred material be elastic silica gel, elastic silica gel has preferably elastic and restoring force, can quickly respond operator and use On demand.

As further scheme, sacculus is set to 0.8-1.5cm with the distance of retainer, in use, and ball Retainer will not be held up by capsule, from the sense of discomfort without causing patient.

Sacculus in this further improved plan can reach have the beneficial effects that: blood taking needle 11 is inserted patient During skin, while operator's hand fixes the retainer of blood taking needle 11, extruding sacculus also unclamps sacculus subsequently, is produced by sacculus Raw negative pressure, the blood in patient's blood vessel is easier to be drawn out to the first conduit 101, in the process from blood taking needle 11, it is possible to side Just operator judges whether corresponding blood taking needle syringe needle head is inserted in patient's blood vessel.

For ensureing the one-way flow of blood in blood collection procedure, the internal fistula puncture blood collecting of the band check valve that this utility model provides Pin is provided with check valve 1 at the second conduit 102, and check valve 1 includes housing 2 and is arranged at the float accommodating intracavity of housing 2 3, spool 4, support member 5 and elasticity part 6.

Housing 2 includes input housing 21 and outfan housing 22, input housing 21 and outfan housing 22 grafting.Defeated Entering end housing 21 include the first baffle plate 211 and be arranged at the first sleeve 212 above the first baffle plate 211, outfan housing 22 wraps Include second baffle 222 and be arranged at the second sleeve 221 below second baffle 222.Second sleeve 221 is arranged at the first sleeve 212 is internal.First sleeve 212 is provided with female thread, and the second sleeve 221 is provided with external screw thread, the first sleeve 212 and the second sleeve 221 are spirally connected.It is provided with blood entry port 8 in the middle part of first baffle plate 211, in the middle part of second baffle 222, is provided with blood outlet 9.

As one of which scheme, the first baffle plate 211 and second baffle 222 are set to flat column structure, first gear The diameter of plate 211 and second baffle 222 is more than the first sleeve 212 and diameter of the second sleeve 221, the most in radial directions, the One sleeve 212 lower end and the second sleeve 221 upper end convex are provided with flange, arrange having the beneficial effects that of flange: conveniently operate Person holds in operation to control the dynamics of precession or back-out.Blood entry port 8 and blood outlet 9 are with conduit 10 even Logical, conduit 10 inserts in blood entry port 8 and blood outlet 9.Blood enters in the chamber of housing 2 and from blood from blood entry port 8 Outlet 9 outflow.

It will be appreciated by those skilled in the art that the connected mode of input housing 21 described above and outfan housing 22 A simply preferred embodiment, certainly, the connected mode of input housing 21 and outfan housing 22 can also use other Such as mortise and tenon coordinates or the mode of interference fit.

Float 3 is arranged at housing 2 and accommodates intracavity near blood entry port 8 side, and float 3 lower end diameter is more than blood entry port 8 Diameter.It is provided with gap between float 3 both sides and housing 2 inwall.

In the alternative of this embodiment, float 3 is set to bowl-type structure, the float 3 sectional area from lower end to upper end by Cumulative greatly, the curvilinear structures of float 3 side can ensure that the resistance that blood is subject to when flowing through float 3 is little.

In order to improve the motility of float 3 motion, i.e. can be easier to float up when float 3 is by buoyancy upwards, The density of float 3 should be less than the density of blood.The preferred material of float 3 can be light foam material.In order to alleviate further The weight of float 3, float 3 upper end arranges open slot, and open slot may be configured as hemispherical open slot.

The operation principle of float 3 is described as follows:

When blood flows into chamber by blood entry port 8, float 3 is moved upward by blood driving force upwards, Owing to being provided with gap between float 3 both sides and housing 2 inwall, the path that blood moves to surface stopped by float 3 and only Can flow to float 3 both sides, the gap between float 3 both sides and housing 2 inwall is the passage of blood flowing, and blood flows through this and leads to Spool 4 is flowed to behind road.

Also, it should be noted float 3 lower end diameter is more than the reason of blood entry port 8 diameter: in blood reverse flow Dynamic, i.e. blood is from blood outlet 9 inflow chamber and when chamber flows to blood entry port 8, and float 3 is under the driving force effect of blood Move downward and prop up blood entry port 8, owing to float 3 lower end width is more than blood entry port 8 width, thus at blood entry port 8 Not having space supply blood to flow out, now blood cannot flow out, thus has reached the effect of one-way flow.

Spool 4 is arranged at float 3 top, offers connection housing 2 and accommodate the blood channel in chamber in spool 4.More preferably, valve Offer the passage of horizontal direction and the passage of vertical direction in core 4, and the passage of the passage of horizontal direction and vertical direction is even Logical.First blood flow in spool 4 from horizontal channel, flows out and flow to the outlet of check valve 1 subsequently from the passage of vertical direction. Also, it should be noted the passage of vertical direction is only in upper end open, lower end not opening, it is to avoid blood flows out from lower end, it is ensured that The unipolarity of blood motion.

For improve spool 4 work efficiency and with the fit of float 3, as one of which preferably embodiment, Spool 4 is set to spherical structure, and the spool 4 of spherical structure is adaptive with the upper end hemispherical open slot of float 3, and spool 4 provides Downward active force can be easier to pass to float 3.

Support member 5 is arranged at spool 4 top, and support member 5 upper end is slidably connected with housing 2 inwall, support member 5 times Holding be connected fixing with spool 4, support member 5 includes connecting portion 51, retaining wall 52 and the sliding part 53 integrally connected, sliding part 53 He Connecting portion 51 is respectively arranged at the top and bottom of retaining wall 52, and sliding part 53 is slidably connected with the inwall of the second sleeve 221, connects One end, portion 51 is fixing with spool 4 to be connected, and the inwall of connecting portion 51 other end and the second sleeve 221 is slidably connected.In support member 5 Portion is provided with cylindrical barrel chamber, and cylindrical barrel chamber is used for accommodating elasticity part 6.The Main Function of support member 5 is to position bullet Power parts 6 and move downward under the driving of elasticity part 6 and pass through spool 4 and float 3 is moved downward until float 3 supports Live blood entry port 8.

Elasticity part 6 is arranged at the into the barrel chamber of support member 5 and offsets with spool 4.Preferably implement as one of which Mode, elasticity part 6 is set to spring.

The primary efficacy of elasticity part 6 is described as follows:

Under check valve 1 normal operating conditions, i.e. blood flows into from blood entry port 8 and when blood outlet 9 outflow, spring Being in compressive state, now float 3 one aspect is by blood buoyancy upwards, on the other hand by spring by support member 5 The downward elastic force passed over, above both sides power reaches balance, and blood normally flows out.

Under check valve 1 abnormal operating state, i.e. blood is from blood outlet 9 inflow and when blood entry port 8 flows out, this Time float 3 one aspect by the downward pressure of blood, on the other hand by spring by support member 5 pass over downward Elastic force, above both sides power is overlapped mutually driving float 3 and moves downward until propping up blood entry port 8, to avoid blood from blood Liquid entrance 8 flows out.

In the alternative of this embodiment, housing 2 is internal may further include sealing ring 7, and sealing ring 7 is arranged at housing 2 bottoms accommodating chamber.Sealing ring 7 is O-ring seal 7, and sealing ring 7 can play good sealing function, it is to avoid blood is from blood Liquid outlet 9 flows to, during blood entry port 8, Seepage occurs.

In conjunction with above technical scheme,

First aspect, blood taking needle 11 and puncture needle 12 connected by conduit 10, it is to avoid blood taking needle 11 of the prior art The drawback of syringe must be utilized；

Second aspect, check valve 1 can be avoided blood to reflux, thus realize the good control to blood；

The third aspect, contacts without body surface in drainage process, and blood conveying is carried out the most in the duct, it is to avoid intersect sense Dye, uses safer.

In conjunction with three above aspect, the internal fistula puncture blood collecting pin of the band check valve that this utility model provides beneficial effect Be: blood taking needle 11 and puncture needle 12 can with the use of, safety, blood sampling volume be easily controlled and be possible to prevent backflow.

Last it is noted that various embodiments above is only in order to illustrate the technical solution of the utility model, rather than it is limited System；Although being described in detail this utility model with reference to foregoing embodiments, those of ordinary skill in the art should Understand: the technical scheme described in foregoing embodiments still can be modified by it, or to the most some or all of Technical characteristic carries out equivalent；And these amendments or replacement, do not make the essence of appropriate technical solution depart from this practicality new The scope of type each embodiment technical scheme.

Claims (10)

1. an internal fistula puncture blood collecting pin for band check valve, including the blood taking needle (11) being sequentially connected with along blood conveying direction, leads Pipe (10) and puncture needle (12), it is characterised in that being provided with check valve (1) on described conduit (10), described check valve (1) includes Housing (2) and be arranged at housing (2) accommodate the float (3) of intracavity, spool (4), support member (5) and elasticity part (6)；

Described float (3) is arranged at housing (2) and accommodates intracavity near blood entry port (8) side, and described spool (4) is arranged at described Float (3) top, offers connection housing (2) and accommodates the blood channel in chamber in described spool (4), described support member (5) sets Being placed in described spool (4) top, described support member (5) upper end is slidably connected with described housing (2) inwall, described support member (5) lower end and described spool (4) are fixing is connected, described elasticity part (6) be arranged at described support member (5) into the barrel chamber and with Described spool (4) offsets.

The internal fistula puncture blood collecting pin of band check valve the most according to claim 1, it is characterised in that described housing (2) includes Input housing (21) and outfan housing (22), described input housing (21) and described outfan housing (22) grafting.

The internal fistula puncture blood collecting pin of band check valve the most according to claim 2, it is characterised in that described input housing (21) include the first baffle plate (211) and be arranged at first sleeve (212) of described first baffle plate (211) top, described outfan Housing (22) includes second baffle (222) and is arranged at second sleeve (221) of described second baffle (222) lower section, described the Two sleeves (221) and the grafting of described first sleeve (212).

The internal fistula puncture blood collecting pin of band check valve the most according to claim 3, it is characterised in that described first sleeve (212) being provided with female thread, described second sleeve (221) is provided with external screw thread, described first sleeve (212) and described second set Cylinder (221) is spirally connected.

The internal fistula puncture blood collecting pin of band check valve the most according to claim 4, it is characterised in that described first baffle plate (211) middle part is provided with blood entry port (8), and described second baffle (222) middle part is provided with blood outlet (9).

The internal fistula puncture blood collecting pin of band check valve the most according to claim 5, it is characterised in that described support member (5) Including the connecting portion (51) integrally connected, retaining wall (52) and sliding part (53), described sliding part (53) and described connecting portion (51) Being respectively arranged at the top and bottom of described retaining wall (52), described sliding part (53) slides even with the inwall of the second sleeve (221) Connecing, described connecting portion (51) one end is fixing with described spool (4) to be connected, described connecting portion (51) other end and described second sleeve (221) inwall is slidably connected.

The internal fistula puncture blood collecting pin of band check valve the most according to claim 5, it is characterised in that described float (3) lower end Diameter is more than blood entry port (8) diameter.

The internal fistula puncture blood collecting pin of band check valve the most according to claim 1, it is characterised in that described housing (2) accommodates Sealing ring (7) it is provided with bottom chamber.

The internal fistula puncture blood collecting pin of band check valve the most according to claim 1, it is characterised in that described float (3) both sides And it is provided with gap between housing (2) inwall.

The internal fistula puncture blood collecting pin of band check valve the most according to claim 1, it is characterised in that described elasticity part (6) It is set to spring.