CN201179272Y

CN201179272Y - One-way positive pressure valve

Info

Publication number: CN201179272Y
Application number: CNU2008200067158U
Authority: CN
Inventors: 栗亚; 潘力; 梁红旗
Original assignee: AMSINO MEDICAL GROUP HOLDING Co Ltd
Current assignee: Amsino Healthcare (Shanghai) Co., Ltd.
Priority date: 2008-02-05
Filing date: 2008-02-05
Publication date: 2009-01-14
Anticipated expiration: 2018-02-05

Abstract

A one-way pressure valve comprises a liquid inlet part which is provided with a liquid inlet pipe, a valve body, a plunger piston and a spring; the liquid inlet part is covered on the mouth of the valve body which consists of a valve body and a branch pipe that is arranged on the side surface of the valve body; the lower end of the valve body is provided with a liquid outlet pipe; the valve body is internally provided with a cavity, the underside of which is provided with a clapboard that separates the cavity into a plunger piston cavity and an outlet cavity. The liquid inlet pipe is arranged right above the plunger piston cavity; the branch pipe and the liquid outlet pipe are respectively arranged at one side of and right under the outlet cavity and are communicated with the outlet cavity; the plunger piston is arranged in the plunger piston cavity; the spring is arranged between the plunger piston and the underside of the plunger piston cavity. 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 plunger piston cavity into an inner cavity sealing towards the liquid inlet and an outer cavity opening to the liquid inlet. The one-way pressure valve leads the valve body to produce a one-way pressure which can prevent the back-flow of liquid medicine or even back-flow of blood, is convenient to be made and fixed, 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 above-mentioned medical apparatus and instruments is in clinical use, there is certain defective: the use of female Luer on the tee T, need carry out partly sterilised at every turn, and to use entry needle to puncture, so just increase work load and operational risk to medical and nursing work, in addition, because external tee T, cause the volume of infusion set excessive, be not easy to fixing and patient's activity; 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, after above-mentioned two kinds of apparatuses all can't be eliminated transfusion and finish, 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 was blocked needle tubing, stoped 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, produce the unidirectional positive valve of the unidirectional normal pressure that prevents medicinal liquid backflow even blood back by valve itself, and, this unidirectional positive valve is convenient to make, and can carry multiple liquid simultaneously.

Further problem to be solved in the utility model is to provide a kind of fixed unidirectional positive valve of being convenient to.

The technical scheme that this utility model adopted is that a kind of unidirectional positive valve comprises liquid inlet parts, valve body, plunger and spring; The liquid inlet component cover is located at the oral area of valve body, is provided with liquid inlet duct on the parts of liquid inlet; 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; The lower end of valve body is provided with liquid outlet tube, is provided with cavity in the valve body, is provided with a dividing plate on the bottom surface of cavity, and this dividing plate is separated into plunger cavity and outlet plenum with cavity; Liquid inlet duct be arranged on plunger cavity directly over, arm and liquid outlet tube be separately positioned on outlet plenum a side and under, and be connected with outlet plenum; The lower end of plunger is stretched in the plunger cavity, and spring is arranged between the bottom surface of plunger and plunger cavity; 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 plunger cavity to the inner chamber of the liquid inlet seal of tube and the exocoel of opening to liquid inlet duct; When unidirectional positive valve was in closed condition, plunger was closed and the seal fluid inlet tube; When check valve was in opening, the liquid that flows into from liquid inlet duct passed through outlet plenum influent outlet.

Above-mentioned unidirectional positive valve, wherein, the cross section ovalize of valve body.

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

Above-mentioned unidirectional positive valve wherein, comprises that also one is used to clog the helmet of the oral area of arm; This helmet comprises medicated cap body and connecting band, and an end of connecting band and medicated cap bulk phase connect, and the other end links to each other with arm.

The beneficial effects of the utility model are:

1. work as spring and compressed by plunger, when unidirectional positive valve of the present utility model is in opening, 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 tube 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.

2. valve body of the present utility model and liquid inlet parts are two independently parts, are convenient to the manufacturing processing of product.

3. valve body constitutes a Y shape threeway, can satisfy the demand of carrying multiple liquid simultaneously, and need as prior art need not external tee T to realize, has reduced the volume of infusion set comparatively speaking; In addition, the cross section ovalize of the valve body of valve body of the present utility model is convenient to fix.

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 liquid inlet parts 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 structural representation of the valve body of the unidirectional positive valve of this utility model;

Fig. 5 B is the generalized section of the valve body 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 opening

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

The specific embodiment

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

As shown in Figures 1 to 3, unidirectional positive valve of the present utility model comprises liquid inlet parts 1, is located at plunger 2, spring 3 and valve body 4 in the valve.Wherein, liquid inlet parts 1 are located at the oral area of valve body 4, are provided with liquid inlet duct 13 on liquid inlet duct member 1.Preferably, be provided with standard Luer joint 11 in the upper end of liquid inlet duct.Valve body 4 is made up of valve body 41 and arm 42, and arm 42 is arranged on the side of valve body 41, and tilts to intersect with valve body 41.Preferably, the cross section ovalize of valve body like this, has two opposite faces comparatively smooth, is convenient to the belt binding fixing.The lower end of valve body 41 is provided with liquid outlet tube 44.Preferably, be provided with the standard Luer joint in the upper end of arm 42.This utility model comprises that also one is used to clog the helmet 5 of the oral area of arm 42, and helmet 5 comprises medicated cap body 51 and connecting band 52, and an end of connecting band 52 links to each other with medicated cap body 51, and the other end links to each other with arm 42.Like this, when arm 42 does not use, can with helmet 5 plugs on arm, make the inner flow passage of arm 42 be unlikely to be polluted because of being exposed in the air.

Fig. 4 A to Fig. 4 C shows the structure of plunger of the present utility model.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 the upper surface 21 of plunger, 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 211 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, be provided with cavity in the valve body 41, on the bottom surface of this cavity, be provided with a dividing plate 43, dividing plate 43 is separated into plunger cavity 45 and outlet plenum 46 with this cavity.Preferably, dividing plate 43 is an arc.Be provided with a spring fixed column 47 on the bottom surface of plunger cavity 45, the lower end of plunger 2 is stretched in the plunger cavity 45, and spring 3 is arranged between the bottom surface of plunger 2 and plunger cavity 45, and is set on the spring fixed column 47.Arm 42 and liquid outlet tube 44 be separately positioned on outlet plenum 46 a side and under, and be connected with outlet plenum 46.

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

Liquid inlet duct 13 of the present utility model be arranged on plunger cavity directly over.Be interference fit between the inwall of last sealing ring 22 and liquid inlet duct 13, like this, when unidirectional positive valve was in closed condition, plunger can be closed and seal fluid inlet tube 13; Be interference fit between the inwall of the plunger cavity 45 of lower seal 24 and valve body 41, lower seal 24 is separated into plunger cavity to the inner chamber 48 of the liquid inlet seal of tube and the exocoel of opening to liquid inlet duct 49.Form to the inner chamber 48 of the liquid inlet seal of tube bottom surface and inner wall limit by plunger 2, lower seal 24, spring 3 and plunger cavity 45.In the present embodiment, arm 42 is connected with liquid outlet tube 44 by outlet plenum 46, and the liquid that flows into from liquid inlet duct 13 and arm 42 all can pass through outlet plenum 46 influent outlets 44, 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 duct 13, medicinal liquid can be input in the cavity of valve body 41 from liquid inlet duct 13, enter outlet plenum 46, flow in other conduit of inlying catheter that links to each other with liquid outlet tube 44 from liquid outlet tube 44 then, finish the process of clinical transfusion, also have the liquid of small part to flow into the exocoel of opening to liquid inlet duct 49 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 48 becomes, the volume of the flow path of the liquid outside the inner chamber 48 diminishes, because the volume-variation of flow path of the liquid, generation promotes normal pressure from liquid residual in the valve to medicine liquid outlet, make residual medicinal liquid in the valves such as liquid in the liquid exocoel 49, continue to enter in the outlet plenum 46, flow out from liquid outlet tube 44 then.That is, make the residual liquor in the valve,, continue to flow along former flow direction.Thereby avoided 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.Liquid inlet duct can connect the female Luer of syringe, transfusion device, tee T etc., and liquid outlet tube can connect the conduit that inserts human vas.

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 liquid inlet parts, valve body, plunger and spring; Described liquid inlet component cover is located at the oral area of described valve body, is provided with liquid inlet duct on the parts of liquid inlet; 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; The lower end of valve body is provided with liquid outlet tube, is provided with cavity in the valve body, is provided with a dividing plate on the bottom surface of described cavity, and described dividing plate is separated into plunger cavity and outlet plenum with described cavity; Described liquid inlet duct be arranged on described plunger cavity directly over, described arm and described liquid outlet tube be separately positioned on described outlet plenum a side and under, and be connected with outlet plenum; The lower end of described plunger is stretched in the described plunger cavity, and described spring is arranged between the bottom surface of plunger and plunger cavity; 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 plunger cavity to the inner chamber of the liquid inlet seal of tube and the exocoel of opening to liquid inlet duct; When described unidirectional positive valve was in closed condition, described plunger was closed and the seal fluid inlet tube; When described check valve was in opening, the liquid that flows into from liquid inlet duct passed through described outlet plenum influent outlet.

2. unidirectional positive valve as claimed in claim 1 is characterized in that, the cross section ovalize of described valve body.

3. 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.

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 duct, is interference fit between the lower seal of described plunger and the inwall of described plunger cavity.

5. unidirectional positive valve as claimed in claim 1 is characterized in that, is provided with equally distributed a plurality of protrusion 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 described plunger cavity, 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, is provided with the standard Luer joint in the upper end of described liquid inlet duct.

9. unidirectional positive valve as claimed in claim 1 is characterized in that, is provided with the standard Luer joint in the upper end of described arm.

10. unidirectional positive valve as claimed in claim 1 is characterized in that, comprises that also one is used to clog the helmet of the oral area of described arm; Described helmet comprises medicated cap body and connecting band, and an end of described connecting band and described medicated cap bulk phase connect, and the other end links to each other with described arm.