CN201179271Y

CN201179271Y - One-way positive pressure valve

Info

Publication number: CN201179271Y
Application number: CNU200820006084XU
Authority: CN
Inventors: 栗亚; 潘力
Original assignee: AMSINO MEDICAL GROUP HOLDING Co Ltd
Current assignee: Amsino Healthcare (Shanghai) Co., Ltd.
Priority date: 2008-01-31
Filing date: 2008-01-31
Publication date: 2009-01-14
Anticipated expiration: 2018-01-31

Abstract

The utility model discloses a one-way pressure valve which comprises a valve body, a plunger piston, a spring and a valve seat; the valve body consists of a valve body and a branch pipe which is arranged at the side surface of the valve body and intersects with the valve body in a slanting manner; the valve body and the valve seat are both hollow structures; the valve body is sleeved on the valve seat and connected with the valve seat in a sealing manner. The upper end of the valve body is provided with a liquid inlet and the lower end of the valve seat is provided with a liquid outlet; a liquid flowing path which is communicated with the branch pipe is arranged between the liquid inlet and the liquid outlet. The lower end of the plunger piston penetrates into the cavity of the valve seat; the spring is arranged between the plunger piston and the underside of the cavity of the valve seat. The peripheral outer walls of the upper end and the lower end of the plunger piston are respectively provided with an upper sealing ring and a lower sealing ring which separates the cavity of the valve seat into an inner cavity sealing towards the liquid inlet and an outer cavity opening to the liquid inlet. The one-way pressure valve can avoid the phenomenon that the negative pressure caused leads the liquid medicine to back-flow or even leads the blood to back-flow to the intravenous catheter, and can transport a variety of liquids at the same time.

Description

Unidirectional positive valve

Technical field

This utility model relates to the unidirectional positive valve that cooperates transfusion catheter and syringe to use, can prevent medicinal liquid backflow and blood back clinically, relates in particular to a kind of unidirectional positive valve that can carry multiple liquid simultaneously.

Background technology

At present, need to infuse in the venous transfusion therapeutic process or when injecting, multiselect is with venous detaining needle or inlying catheter prolonged and repeatedly.Usually connect the threeway conduit on these venous detaining needles or the inlying catheter, be furnished with standard Luer (Luer) joint or calparine cap on the threeway conduit usually, to satisfy the clinical requirement of multiple transfusion.But there is certain defective in above-mentioned medical apparatus and instruments in clinical use: the use of female Luer on the tee T, and need carry out partly sterilised at every turn, and will use entry needle to puncture, so just increase work load and operational risk to medical and nursing work; The use of calparine cap then needs medical personnel after the filling medicinal liquid, and injection heparin or normal saline carry out tube sealing in calparine cap, prevents that blood coagulation from forming thrombosis, and this brings burden to clinical manipulation equally.In addition, the application of calparine cap also might cause little air to enter blood circulation, has risk.

Simultaneously, above-mentioned two kinds of apparatuses all can't solve after transfusion finishes, because the negative pressure that produces when drawing back entry needle or not having needle adapter causes blood of human body to pass back into the indwelling flexible pipe, blood coagulation is blocked needle tubing, stop transfusion next time and the serious potential safety hazard that produces.

Summary of the invention

Technical problem to be solved in the utility model is to overcome the above-mentioned shortcoming of prior art, provide a kind of after finishing transfusion, prevent that by valve generation itself medicinal liquid from refluxing even the unidirectional positive valve of the unidirectional normal pressure of blood back, and this unidirectional positive valve can be carried multiple liquid simultaneously.

The technical scheme that this utility model adopted is that a kind of unidirectional positive valve comprises valve body, plunger, spring and valve seat; Valve body is made up of valve body and arm, and arm is arranged on the side of valve body, and tilts to intersect with valve body; Valve body and valve seat are hollow structure, valve body is set on the valve seat, and be connected with valve base sealing, upper end at valve body is provided with the liquid inlet, lower end at valve seat is provided with liquid outlet, be provided with liquid flow path between liquid inlet and liquid outlet, liquid flow path is connected with arm; The lower end of plunger is stretched in the cavity of valve seat, and spring is arranged between the bottom surface of cavity of plunger and valve seat; Be respectively equipped with sealing ring and lower seal on the peripheral outer wall of the top and bottom of plunger; Lower seal is separated into the cavity of valve seat to the inner chamber of liquid inlet sealing and the exocoel of opening to the liquid inlet; When described unidirectional positive valve was in closed condition, plunger was closed and the seal fluid inlet; When check valve was in opening, the liquid that flows into from the liquid inlet was by the outlet of liquid flow path influent.

Above-mentioned unidirectional positive valve wherein, is provided with a cavity in the plunger, cavity is opened on the bottom surface of plunger, and plunger bushing is located on the described spring.

Above-mentioned unidirectional positive valve, wherein, the bottom of valve seat is provided with valve seat through-hole, and valve seat through-hole is arranged between liquid flow path and the liquid outlet and with liquid flow path and liquid outlet and is connected, from the effusive liquid of liquid flow path by the outlet of valve seat through-hole influent.

The beneficial effects of the utility model are: when spring is compressed by plunger, and when unidirectional positive valve of the present utility model is in open mode, the smaller volume of inner chamber, it is big that the volume of the flow path of the liquid outside the inner chamber becomes; Drive the plunger resilience and work as spring, when unidirectional positive valve cut out, it is big that the volume of inner chamber becomes, and the volume of the flow path of the liquid outside the inner chamber diminishes, thereby produces the normal pressure of valve inner liquid medicine to the liquid outlet promotion, prevents that medicinal liquid from refluxing even blood back.Therefore, unidirectional positive valve of the present utility model is finished when screwing out syringe, transfusion device etc. in transfusion, can avoid causing medicinal liquid to reflux even blood is back to the phenomenon of veins indwelling catheter because of producing negative pressure.And this utility model adopts the needleless operation, has ensured medical personnel's safety, has improved medical and nursing work efficient, has alleviated patient's misery.

Description of drawings

Fig. 1 is the schematic perspective view of the unidirectional positive valve of this utility model;

Fig. 2 is the three-dimensional exploded view of the unidirectional positive valve of this utility model;

Fig. 3 is the sketch map of the valve body of the unidirectional positive valve of this utility model;

Fig. 4 A is the schematic perspective view of the plunger of the unidirectional positive valve of this utility model;

Fig. 4 B is the front schematic view of the plunger of the unidirectional positive valve of this utility model;

Fig. 4 C is the generalized section of the plunger of the unidirectional positive valve of this utility model;

Fig. 5 A is the sketch map of the valve seat of the unidirectional positive valve of this utility model;

Fig. 5 B is the generalized section of the valve seat of the unidirectional positive valve of this utility model;

Fig. 6 A is the sketch map of the unidirectional positive valve of this utility model when being in closed condition

Fig. 6 B is the sketch map of the unidirectional positive valve of this utility model when being in opening.

The specific embodiment

Below in conjunction with accompanying drawing this utility model is described in further detail.

As shown in Figure 1 and Figure 2, unidirectional positive valve of the present utility model is made up of valve body 1, plunger 2, spring 3 and the valve seat 4 be located in the valve.Wherein, valve body 1 is made up of valve body 11 and arm 12, and arm 12 is arranged on the side of valve body 11, and tilts to intersect with valve body 11.Only show an arm in the drawings, also can in the side of valve body a plurality of arms be set according to the requirement of transfusion.Valve body 11 and valve seat 4 are hollow structure, and valve body 11 is set on the valve seat 4, and are tightly connected with valve seat 4.

As shown in Figure 3, be provided with liquid inlet 13 in the upper end of the valve body 11 of unidirectional positive valve of the present utility model, preferably, the upper end of liquid inlet 13 is provided with standard Luer joint 15.

Shown in Fig. 4 A to Fig. 4 C, on the peripheral outer wall of the top and bottom of plunger 2, be respectively equipped with sealing ring 22 and lower seal 24, on plunger 2, also be provided with the round platform 26 that limits lower seal 24 range of activity.Be provided with a cavity 27 in the plunger 2, this cavity is opened on the bottom surface 25 of plunger, and plunger 2 is set in the top of spring 3 by this cavity.On plunger upper surface 21, be provided with equally distributed three protrusions 211, be used to prevent the slippage when unidirectional positive valve is connected with external female Luer.In a kind of better embodiment, these three protrusions are equilateral triangle and distribute.Preferably, last sealing ring 22 and lower seal 24 are O-ring seal.

Shown in Fig. 5 A and 5B, in the valve seat 4 of unidirectional positive valve of the present utility model, be provided with a cavity 46, cavity 46 is opened on the top of valve seat 4, is provided with a spring fixed column 45 that is used for fixing spring 3 on the bottom surface of cavity 46.The lower end of plunger 2 is stretched in the cavity 46, and spring 3 is arranged between the bottom surface of cavity 46 of plunger 2 and valve seat 4, and is set on the spring fixed column 45.The lower end of valve seat 4 is provided with liquid outlet 44, and the lower end of liquid outlet 44 is provided with the joint 43 that can be stained with the glue intubate.The bottom of valve seat 4 also is provided with valve seat through-hole 42, and valve seat through-hole 42 is connected with liquid outlet 44.

Shown in Fig. 6 A and 6B, the operation principle of unidirectional positive valve of the present utility model is:

The valve body 11 of the unidirectional positive valve of this utility model is set in the outside of valve seat 4.Be interference fit between the inwall of last sealing ring 22 and liquid inlet 13, like this, when unidirectional positive valve was in closed condition, plunger can be closed and seal fluid inlet 13; Be interference fit between the inwall of the cavity 46 of lower seal 24 and valve seat 4, lower seal 24 is separated into the cavity in the valve seat 46 to the inner chamber 47 of liquid inlet sealing and the exocoel of opening to the liquid inlet 48.Form to the inner chamber 47 of liquid inlet sealing bottom surface and inner wall limit by plunger 2, lower seal 24, the spring 3 that is connected with the plunger lower end and cavity 46.In the present embodiment, space between the inwall of valve body 11 and the valve seat 4 has constituted liquid flow path 5, this liquid flow path 5 is connected with arm 12, from the liquid inlet 13 and the liquid that flows into of arm 12 all can export by liquid flow path 5 influents, thereby can carry out the transfusion of multiple liquid simultaneously.

When unidirectional positive valve is in opening, plunger upper surface 21 is pushed by external female Luer, plunger 2 transfers the pressure on the spring 3, cause spring 3 distortion, thereby sealing ring 22 is dropped under the liquid inlet 13, liquid flow path 5 is opened in the valve, medicinal liquid is 13 inputs from the liquid inlet, flow through liquid flow path 5 in the valve, enter valve seat through-hole 42 in the valve, flow in other conduit of inlying catheter that links to each other with valve base joint 43 from liquid outlet 44 then, finish the process of clinical transfusion, also have the liquid of small part to flow into the exocoel of opening to the liquid inlet 48 simultaneously.The flow direction of liquid is shown in arrow among the figure.

When external female Luer was closed unidirectional positive valve by back-out, spring 3 reinstatements produced resilience force, promote the position that plunger 2 moves to closed condition.At this moment, it is big that the volume of inner chamber 47 becomes, the volume of the flow path of the liquid outside the inner chamber 47 diminishes, because the volume-variation of flow path of the liquid, generation to the normal pressure that medicine liquid outlet promotes, makes residual medicinal liquid in the valves such as liquid in the exocoel 48 with liquid residual in the valve, continues by liquid flow path 5, enter in the valve seat through-hole 42, flow out from liquid outlet 44 then.That is, make the residual liquor in the valve,, continue to flow along former flow direction.Thereby avoided medicinal liquid because the caused medicinal liquid of negative pressure that produces when screwing out external female Luer refluxes even blood refluxes.

This utility model cooperates transfusion catheter or syringe to use clinically.The liquid inlet can connect the female Luer of syringe, transfusion device, tee T etc., and liquid outlet can connect the conduit that inserts human vas.Use the clinical purpose of this valve to be: after transfusion finishes, when extracting the female Luer of syringe, transfusion device, tee T etc. out, unidirectional positive valve can produce a kind of interior residual liquid of valve that makes and continue mobile normal pressure to former flow direction, prevent to cause that because of the negative pressure that the female Luer of extracting syringe, transfusion device out produces medicinal liquid backflow even blood back are in valve or in the conduit, simultaneously, this unidirectional positive valve can be carried multiple liquid simultaneously.

The description of the present embodiment combines certain embodiments, but it should be understood by one skilled in the art that this utility model is not limited to embodiment described here, and can carry out various modifications and variations and do not deviate from spirit and scope of the present utility model.

Claims

1. a unidirectional positive valve is characterized in that, comprises valve body, plunger, spring and valve seat; Described valve body is made up of valve body and arm, and described arm is arranged on the side of described valve body, and tilts to intersect with valve body; Valve body and valve seat are hollow structure, valve body is set on the valve seat, and be connected with valve base sealing, upper end at described valve body is provided with the liquid inlet, lower end at described valve seat is provided with liquid outlet, be provided with liquid flow path between described liquid inlet and liquid outlet, described liquid flow path is connected with described arm; The lower end of described plunger is stretched in the cavity of described valve seat, and described spring is arranged between the bottom surface of cavity of plunger and valve seat; Be respectively equipped with sealing ring and lower seal on the peripheral outer wall of the top and bottom of described plunger; Described lower seal is separated into the cavity of valve seat to the inner chamber of liquid inlet sealing and the exocoel of opening to the liquid inlet; When described unidirectional positive valve was in closed condition, described plunger was closed and the seal fluid inlet; When described check valve was in opening, the liquid that flows into from the liquid inlet was by described liquid flow path influent outlet.

2. unidirectional positive valve as claimed in claim 1 is characterized in that, is provided with a cavity in the described plunger, and described cavity is opened on the bottom surface of plunger, and plunger bushing is located on the described spring.

3. unidirectional positive valve as claimed in claim 1, it is characterized in that, the bottom of described valve seat is provided with valve seat through-hole, described valve seat through-hole is arranged between described liquid flow path and the described liquid outlet and with liquid flow path and liquid outlet and is connected, from the effusive liquid of described liquid flow path by the outlet of valve seat through-hole influent.

4. unidirectional positive valve as claimed in claim 1 is characterized in that, is interference fit between the last sealing ring of described plunger and the inwall of described liquid inlet, is interference fit between the inwall of the lower seal of described plunger and the cavity of described valve seat.

5. unidirectional positive valve as claimed in claim 1 is characterized in that, is provided with a plurality of protrusions on the upper surface of described plunger.

6. unidirectional positive valve as claimed in claim 5 is characterized in that, described protrusion is three, and described three protrusions become equilateral triangle to distribute.

7. unidirectional positive valve as claimed in claim 1 is characterized in that, is provided with a spring fixed column on the bottom surface of the cavity of described valve seat, and described spring housing is located on the described spring fixed column.

8. unidirectional positive valve as claimed in claim 1 is characterized in that the upper end of described liquid inlet is provided with the standard Luer joint.