CN2920294Y - Counter-flow preventing valve including expanding device and the same expanding device - Google Patents
Counter-flow preventing valve including expanding device and the same expanding device Download PDFInfo
- Publication number
- CN2920294Y CN2920294Y CN 200620115385 CN200620115385U CN2920294Y CN 2920294 Y CN2920294 Y CN 2920294Y CN 200620115385 CN200620115385 CN 200620115385 CN 200620115385 U CN200620115385 U CN 200620115385U CN 2920294 Y CN2920294 Y CN 2920294Y
- Authority
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- China
- Prior art keywords
- valve
- check valve
- extension fixture
- valve port
- section
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 241001415939 Corvus Species 0.000 claims description 9
- XSKZXGDFSCCXQX-UHFFFAOYSA-N thiencarbazone-methyl Chemical compound COC(=O)C1=CSC(C)=C1S(=O)(=O)NC(=O)N1C(=O)N(C)C(OC)=N1 XSKZXGDFSCCXQX-UHFFFAOYSA-N 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 description 10
- 241000272525 Anas platyrhynchos Species 0.000 description 9
- 239000008280 blood Substances 0.000 description 8
- 210000004369 blood Anatomy 0.000 description 8
- 210000004204 blood vessel Anatomy 0.000 description 6
- 230000002950 deficient Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000036772 blood pressure Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000741 silica gel Substances 0.000 description 2
- 229910002027 silica gel Inorganic materials 0.000 description 2
- 239000007779 soft material Substances 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Images
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- Check Valves (AREA)
Abstract
The utility model provides a countercurrent preventing valve containing an expansion device, and the countercurrent preventing valve includes a cylinder part, as well as a crow mouth part at one side of the cylinder part, the crow mouth part is the symmetric anti-inverse wedge valve structure formed by flatting the two sides of the front end of the cylinder part gradually, the front end of the anti-inverse wedge valve structure is a rectangular cross-section or a similar rectangular cross-section, a valve opening having the line-shape middle slot is provided along the direction of the length, the utility model is characterized in that the countercurrent preventing valve also contains the expansion device, the expansion device includes a pair of column shape members positioned in the inner side of the countercurrent preventing valve and located at the two ends of the valve opening, and the expansion device drives the valve opening to expand outside. The utility model also provides an expansion device which is the same as the above said. The utility model can effectively improve the existing closing performance of the countercurrent preventing valve in the indwelling needle and achieve simple, precise, quick and reliable closure.
Description
Technical field
This utility model relates to medical apparatus and instruments, especially relates to a kind of check valve and this extension fixture that includes extension fixture.
Background technology
Pin and outer pin in remaining needle comprises, interior pin connect and are arranged at outer pin inboard, and behind remaining needle insertion blood vessel, outer pin is kept somewhere in blood vessel and interior pin is extracted, so that repeatedly infuse thereafter.
The application of remaining needle has simplified the operation of medical personnel's repeated localised puncture blood vessel, reduced simultaneously patient's misery again, greatly reduce that puncture vessel operation itself had dangerous and because repeated localised puncture blood vessel and may the infection that the patient causes being threatened, and can shorten the time of transfusion operation greatly.
In order to prevent that when transfusion finishes remaining needle transfusion from flowing into the hidden danger that blood that end pressure causes less than the blood pressure of outflow end refluxes by remaining needle, generally all be provided with check valve in the existing remaining needle, this check valve mainly prevents blood back flow by the anti-reverse valve structure of wedge shape that is provided with thereon, because the anti-reverse valve structure profile of this wedge shape and black duckbilled are approaching, so be the Corvus macrorhuchus mouth hereinafter to be referred as it.Described its structure of black duck bill is generally by soft materials such as silica gel to be made, and this Corvus macrorhuchus mouth can effectively guarantee in smooth afferent veins of medicinal liquid or the tremulous pulse and stop blood back flow.As No. 200420078043.3 disclosed anti-reverse mobile venous detaining needles of Chinese patent.
But its front end valve port of black duck bill in this anti-reverse mobile venous detaining needle is not owing to there is other any ancillary method, when so remaining needle uses, when interior pin passes check valve, the two adjacent long limits of closure of valve port can produce a fixed gap after interior pin is extracted, cause a spot of blood back flow by this space, particularly interior pin is positioned at the valve port place for a long time and can causes the valve port closing force to descend, thus in causing pin extract the back closed location can't quick-make, can cause blood along the valve port adverse current; In addition when the long or long situation of drop time of remaining needle indwelling time in blood vessel, valve port is because closing force is weak and may cause closure fully through using repeatedly, if stilligout comes off or drop blood back flow will take place when finishing in the drop, cause the danger of bleeding profusely.
In addition, the anti-reverse valve of wedge shape that constitutes this duck bill has the interior outer surface that be arranged in parallel, when such structure can cause valve port two ends pressure reduction very little, auto-closing under the effect of valve self elastic force, therefore, when this pressure reduction is the state of forward, be that check valve input pressure is when being slightly larger than output end pressure, when just vessel inner blood pressure is slightly less than infusion pressure, valve port is closed and can't be carried out the liquid input, so the check valve of this structure can't guarantee reliably transfusion under the small pressure difference state.
In sum, therefore defective such as existing check valve has that anti-reverse poor performance, reaction sensitivity are low, transfusion poor reliability and potential safety hazard be big during small pressure difference has limited its application to a great extent.
The utility model content
At the defective and the deficiency of check valve in the existing remaining needle, the purpose of this utility model is to provide a kind of check valve and this extension fixture that can eliminate its above-mentioned defective and insufficient extension fixture that include.
The technical solution of the utility model is as follows:
A kind of check valve that includes extension fixture, the Corvus macrorhuchus mouth that described check valve comprises cylindrical portion and is positioned at this cylindrical portion one side, described Corvus macrorhuchus the mouth gradually flat and anti-reverse valve structure of symmetric wedge shape that forms in these cylindrical portion front end both sides of serving as reasons, the anti-reverse valve structure front end of described wedge shape is rectangle section or approximate rectangle section, described section has the valve port of the wire centre joint along its length direction, it is characterized in that: described check valve also comprises an extension fixture, and described extension fixture comprises that a pair of check valve that is arranged at is inboard and be positioned at described valve port two ends and can drive this valve port with its columnar part that expands outwardly.
Described two columnar parts are along the setting of check valve axially parallel and only expand outwardly at front end position separately.
Its section of described columnar part is a triangle.
Its inboard, described front end position is convergence laterally gradually.
The anti-reverse valve of described wedge shape has the interior lateral surface of different angle, and its medial surface inclination angle is slightly less than the lateral surface inclination angle.
Its lateral surface of the anti-reverse valve of described wedge shape is made up of two planes of different angle, and wherein its inclination angle, plane of close valve port is less than the planar inclination angle away from valve port.
A kind of foregoing extension fixture is characterized in that: described extension fixture comprises that a pair of check valve that is arranged at is inboard and be positioned at its valve port two ends and can drive this valve port with its columnar part that expands outwardly and in order to fix the installation portion of this columnar part.
Described two columnar parts are along the setting of check valve axially parallel and only expand outwardly at front end position separately.
Its section of described columnar part is that triangle and its front end position converge wedge-like laterally.
Described installation portion is a cylindrical structure and suitable with the cylindrical portion inboard of described check valve.
Technique effect of the present utility model is:
This utility model is by being provided with extension fixture in check valve, this extension fixture comprises that a pair of check valve that is arranged at is inboard and be positioned at its valve port two ends and can drive this valve port with its columnar part that expands outwardly.
Because the valve port of check valve expands outwardly with it under the effect of extension fixture, and check valve generally is to be made by soft materials such as silica gel, it has good elasticity, the valve port closure is subjected to the side direction stretching action and fits to binding site naturally, thereby improve the closure function power of closed location, improve the effect that stops adverse current.Therefore, this utility model can significantly improve the counterseal effect of existing check valve, make check valve can prevent blood back flow simple and easy, accurate, reliably, and because the valve port of check valve is in the state of being expanded all the time, also make this check valve have the characteristics of quick-make, make the check valve reaction more sensitive, reliable, can effectively improve the safety of check valve, solve the problem of existing check valve valve port well owing to the weak blood back flow that causes of closing force.
This utility model is also by being arranged to the anti-reverse valve of the wedge shape of Corvus macrorhuchus mouth to have the interior lateral surface of different angle, and the inclination angle of medial surface is slightly less than the inclination angle of lateral surface, when anti-reverse structure like this is slightly larger than output end pressure at liquid input pressure, be that the forward pressure reduction at check valve two ends is when very little, the pressure that acts on wedge shape valve inboard can more effectively impel valve port to open, thereby having guaranteed reliably that valve port still can normally be opened under forward small pressure difference situation carries out transfusion operation.
In addition, in check valve of the present utility model, the wedge shape valve also has following structure: the angle of the front portion of its lateral surface and axis projection face is less than the rear portion of its lateral surface and the angle of axis projection face.
Such structure is more optimized its force-bearing situation of wedge shape valve, when not reducing the check valve structural strength, the pressure that the wedge shape valve is suffered from blood vessel, it is bigger with the component of the perpendicular direction in the closed contact site of valve port, promptly impel the power of valve port closure bigger, therefore, anti-reverse effect and performance are also more remarkable.
This utility model also provides a kind of aforesaid extension fixture, and described extension fixture comprises that a pair of check valve that is arranged at is inboard and be positioned at its valve port two ends and can drive this valve port with its columnar part that expands outwardly and in order to fix the installation portion of this columnar part.
Because two columnar parts that expand outwardly of this extension fixture are arranged at the both sides of check valve valve port respectively, so Corvus macrorhuchus mouth valve port two ends are outwards expanded, thereby make the closed location of valve port both sides have certain force of strain, and under this tensile effect, its closed location produces the trend of shrinking to closing direction, thereby realizes strengthening the purpose of valve port closing force.
This columnar part is along the setting of check valve axially parallel and only expand outwardly at front end position separately.Only expand outwardly at leading section for be arrangeding in parallel because columnar part is most of, such structure both can realize expanding the purpose of valve port, is convenient to extension fixture again simultaneously the location is installed in check valve.
Therefore this extension fixture is simple in structure, reliable in action, is convenient to processing and installs.
Description of drawings
Fig. 1 comprises the structural representation of the check valve of extension fixture for this utility model.
Fig. 2 is the plan structure sketch map of Fig. 1.
Fig. 3 is the left TV structure sketch map of Fig. 1.
The 1-check valve, 2-extension fixture, 11-crow duck bill, 12-cylindrical portion, 13-installation portion, 21-column, the 22-expansion body, the little cylindrical portion of 23-, domatic before the 112-, domatic behind the 113-, the 114-medial surface, the 115-section, 116-opening line, 117-valve port, the long limit of 118-, the long limit of 119-.
The specific embodiment
Below in conjunction with accompanying drawing this utility model is described further.
Be illustrated in figure 1 as the structural representation of this utility model check valve.Extension fixture 2 is arranged at check valve 1 inside, the installation portion 13 that check valve 1 comprises cylindrical portion 12, is positioned at cylindrical portion 12 forward black duck bill 11 and is positioned at cylindrical portion 12 rear portions, and wherein installation portion 13 matches with the outer needle stand of remaining needle.Extension fixture 2 comprises little cylindrical portion 23, column 21 and is positioned at column 21 forward expansion body 22, and wherein little cylindrical portion 23 and cylindrical portion 12 are inboard suitable and be connected, and column 21 is symmetricly set in little cylindrical portion 23 1 end both sides.
Crow duck bill 11 is for by the gradually flat anti-reverse valve structure of symmetrically arranged wedge shape that forms in cylindrical portion 12 both sides, the anti-reverse valve structure front end of this wedge shape is rectangle or approximate rectangle section 115, the lateral surface of wedge shape valve is divided into preceding domatic 112 and back domatic 113, back domatic 113 has than preceding domatic 112 bigger inclinations angle, as shown in Figure 2, the inclination angle of the medial surface 114 of wedge shape valve is slightly less than preceding domatic inclination angle, it is opening line 116 that medial surface 114 front ends of both sides intersect, certain two medial surface 114 also can intersect but form the rectangle section, the centrage of this section promptly is equivalent to opening line 116, has the slit along opening line 116 forward end to section 115 and forms valve port 117.
For medial surface 114, along with the variation at medial surface 114 inclination angles, the width of valve port 117 changes thereupon, and under the limiting case, valve port 117 overlaps with the center line of section 115.
In the present embodiment, before the lateral surface of wedge shape valve is divided into domatic 112 and the back domatic 113, back domatic 113 has than preceding domatic 112 bigger inclinations angle, on the one hand, domatic 113 inclination angles, back are bigger, and then this position has bigger thickness, can well guarantee the structural strength of black duck bill 11; On the other hand, preceding domatic 112 inclination angles are less, and the pressure that comes autoblood that the wedge shape valve is subjected to will increase at the component along vertical valve port 117 directions, thereby effectively improve the force-bearing situation of valve port 117, improve the closure effect of valve port 117.
For extension fixture 2, the triangular prism structure of column 21 for be arrangeding in parallel, can certainly be other column structure, as pole shape or quadrangular etc., expansion body 22 is positioned at column 21 front ends, the inboard of expansion body 22 has forward end lateral surface astringent trend gradually, and this astringent trend mainly is in order to improve and strengthen the elasticity of expansion body 22, and alleviates its weight to greatest extent.The column 21 and expansion body 22 outsides contact with check valve 1 inboard, crow duck bill 11 stretches to two ends under the effect of expansion body 22, thereby driving duck bill 11 front ends expands to two ends, as shown in Figure 3, this expansion will produce the tension force to valve port 117 extruding near the material the valve port 117, this tension force will improve the closing force of valve port 117, make two of section 115 fit 118,119 applyings of long limit rapidly and closely, thereby realize that valve port 117 is simple and easy, accurate, quickly and reliably closed, make to the utlity model has more anti-reverse effect.
Can certainly adopt not in the expansion of column 21 front ends, the column 21 of both sides is not to be arranged in parallel but expansion setting laterally gradually, and makes the internal diameter of the outer lateral extent of front end of two columns 21 greater than cylindrical portion 12.Preferred scheme is that expansion body 22 is positioned at the front end of two columns 21 and is deep into Corvus macrorhuchus mouth 11 in cylindrical portion 12 inboards, can make valve port 117 closing forces stronger.
The above only is a preferred implementation of the present utility model.Should be pointed out that for a person skilled in the art, can also make a lot of modification and improvement, but these modification and improvement all will fall into protection domain of the present utility model according to design of the present utility model and scheme.
Claims (10)
1. check valve that includes extension fixture, the Corvus macrorhuchus mouth that described check valve comprises cylindrical portion and is positioned at this cylindrical portion one side, described Corvus macrorhuchus the mouth gradually flat and anti-reverse valve structure of symmetric wedge shape that forms in these cylindrical portion front end both sides of serving as reasons, the anti-reverse valve structure front end of described wedge shape is rectangle section or approximate rectangle section, described section has the valve port of the wire centre joint along its length direction, it is characterized in that: described check valve also comprises an extension fixture, and described extension fixture comprises that a pair of check valve that is arranged at is inboard and be positioned at described valve port two ends and can drive this valve port with its columnar part that expands outwardly.
2. a kind of check valve that includes extension fixture as claimed in claim 1 is characterized in that: described two columnar parts are along the setting of check valve axially parallel and only expand outwardly at front end position separately.
3. a kind of check valve that includes extension fixture as claimed in claim 2 is characterized in that: its section of described columnar part is a triangle.
4. a kind of check valve that includes extension fixture as claimed in claim 3 is characterized in that: its inboard, described front end position is convergence laterally gradually.
5. a kind of check valve that includes extension fixture as claimed in claim 1 is characterized in that: the anti-reverse valve of described wedge shape has the interior lateral surface of different angle, and its medial surface inclination angle is slightly less than the lateral surface inclination angle.
6. a kind of check valve that includes extension fixture as claimed in claim 5 is characterized in that: its lateral surface of the anti-reverse valve of described wedge shape is made up of two planes of different angle, and wherein its inclination angle, plane of close valve port is less than the planar inclination angle away from valve port.
7. extension fixture as claimed in claim 1 is characterized in that: described extension fixture comprises that a pair of check valve that is arranged at is inboard and be positioned at its valve port two ends and can drive this valve port with its columnar part that expands outwardly and in order to fix the installation portion of this columnar part.
8. extension fixture as claimed in claim 7 is characterized in that: described two columnar parts are along the setting of check valve axially parallel and only expand outwardly at front end position separately.
9. extension fixture as claimed in claim 8 is characterized in that: its section of described columnar part is that triangle and its front end position converge wedge-like laterally.
10. extension fixture as claimed in claim 7 is characterized in that: described installation portion is a cylindrical structure and suitable with the cylindrical portion inboard of described check valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620115385 CN2920294Y (en) | 2006-05-25 | 2006-05-25 | Counter-flow preventing valve including expanding device and the same expanding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620115385 CN2920294Y (en) | 2006-05-25 | 2006-05-25 | Counter-flow preventing valve including expanding device and the same expanding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2920294Y true CN2920294Y (en) | 2007-07-11 |
Family
ID=38252774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620115385 Expired - Lifetime CN2920294Y (en) | 2006-05-25 | 2006-05-25 | Counter-flow preventing valve including expanding device and the same expanding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2920294Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111050833A (en) * | 2017-07-19 | 2020-04-21 | 贝克顿·迪金森公司 | System and method for improving instrument guidance in an intravenous catheter assembly |
-
2006
- 2006-05-25 CN CN 200620115385 patent/CN2920294Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111050833A (en) * | 2017-07-19 | 2020-04-21 | 贝克顿·迪金森公司 | System and method for improving instrument guidance in an intravenous catheter assembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070711 |
|
| EXPY | Termination of patent right or utility model |