CN102949765A - Anti-backflow syringe - Google Patents
Anti-backflow syringe Download PDFInfo
- Publication number
- CN102949765A CN102949765A CN2011102413202A CN201110241320A CN102949765A CN 102949765 A CN102949765 A CN 102949765A CN 2011102413202 A CN2011102413202 A CN 2011102413202A CN 201110241320 A CN201110241320 A CN 201110241320A CN 102949765 A CN102949765 A CN 102949765A
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- CN
- China
- Prior art keywords
- chock
- resilient sleeve
- push rod
- bearing surface
- injection tube
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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.)
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- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention discloses a anti-backflow syringe which comprises an injection cylinder and a liquid push component. The injection cylinder is hollow, and an injection end forms at one end of the injection cylinder. The liquid push component is provided with a push rod and an elastic sleeve, a plug is arranged at one end of the push rod and is provided with an abutting surface, the push rod is disposed in the injection cylinder, the abutting surface faces the injection end of the injection cylinder, the elastic sleeve is provided with a through hole axially penetrating and is sleeved on the plug, and the abutting surface of the plug is exposed outside the through hole of the elastic sleeve. The abutting surface of the plug is exposed outside the through hole of the elastic sleeve, so that the push rod can be abutted to the inner periphery of the injection end of the injection cylinder with the plug small in elastic coefficient, 'blood return' is avoided when a user stops pushing the push rod, blood clot can be prevented from blocking blood vessels when intravenous drip is performed, and injection safety is increased.
Description
Technical field
The invention relates to a kind of syringe, a kind of medicament that has been installed in particularly, and may be implemented in intravenous drip and blood return prevention syringe with blood return prevention function.
Background technology
See also Fig. 1, it is common a kind of syringe 9 at present, comprises an injection tube 91, a push rod 92 and a resilient sleeve 93.This injection tube 91 is hollow form and can be installed in injection, and an end of this injection tube 91 forms dispensing end 911 and connects an injection needle 94 is set, and the other end of this injection tube 91 forms opening 912.One end of this push rod 92 is the operating portion 921 that is available for users to press, and the other end of this push rod 92 then is provided with a chock 922.This resilient sleeve 93 has elasticity and is combined in outside this chock 922, and in this resilient sleeve 93 can all be coated on the free end of this chock 922 and periphery wall, and the external diameter of this resilient sleeve 93 is slightly larger than the internal diameter of injection tube 91.
Yet, because resilient sleeve 93 has elasticity, therefore when implementing intravenous injection (Intravenous Injection), when resilient sleeve 93 is pushed into dispensing end 911 place of contiguous injection tube 91, these resilient sleeve 93 front ends will be subjected to the tube wall extruding at dispensing end 911 places and produce distortion, and in user application of force when pushing elastic return and produce the strength of one resilience no longer, thereby produce the suction of pumpback in the injection needle 94, this suction then produce negative pressure and from the patient vessel blood of back suction trace, form the phenomenon of " blood back ".
When general subcutaneous injection, it is harmless that " blood back " phenomenon occurs, if but " blood back " phenomenon is when occurring in successional intravenous injection-intravenous drip (Intravenous Drip), the blood that refluxes easily remains in the conduit that is communicated with remaining needle and condenses gradually, and the little clot after condensing may block this conduit, even with after injection or when having an intravenous drip, enter among the patient vessel so that produce the risk of artery-clogging.
Moreover because the assembling mode of existing syringe 9, by pressing resilient sleeve 93, the chock 922 front end crimps that make resilient sleeve 93 drawn stems 92 to be filling in chock 922, and recover originally external forms by resilient sleeve 93 after filling in; Therefore, for making resilient sleeve 93 and chock 922 easier combinations, usually can be set as loose fit form greater than these chock 922 volumes in conjunction with the space in the resilient sleeve 93.
Yet so that after resilient sleeve 93 is incorporated into push rod 92, will there be many space G in the loose fit kenel between resilient sleeve 93 and the chock 922 between the internal perisporium of resilient sleeve 93 and chock 922.Wherein, chock 922 and resilient sleeve 93 space G in the axial direction will increase the axial deflection that produces when resilient sleeve 93 front ends are subjected to the tube wall extruding of dispensing end 911 places, thereby cause existing syringe 9 very easily to produce " blood back " phenomenon when implementing intravenous injection.
Summary of the invention
Main purpose of the present invention provides a kind of blood return prevention syringe, makes the chock bare front end of push rod and dispensing end internal perisporium that can the butt injection tube, to avoid the producing blood back phenomenon when implementing injection.
A time purpose of the present invention provides a kind of blood return prevention syringe, makes the dispensing end internal perisporium butt of chock front end and injection tube, with in the axial direction space between the chock of avoiding compressing push rod and the resilient sleeve.
For reaching aforementioned purpose, the technology contents that the present invention uses includes:
A kind of blood return prevention syringe, it comprises: an injection tube is hollow form and an end and forms a dispensing end; Reach one and push away the liquid assembly, have a push rod and a resilient sleeve, one end of this push rod is provided with a chock, this chock has a bearing surface, this push rod is arranged in this injection tube, and this bearing surface is towards the dispensing end of this injection tube, and this resilient sleeve is provided with a through hole that runs through vertically, this resilient sleeve is sleeved on this chock, and the bearing surface of this chock is exposed to outside the through hole of this resilient sleeve.
Blood return prevention syringe of the present invention, wherein, the periphery wall of this chock is provided with an annular groove, and this resilient sleeve is incorporated into this annular groove.
Blood return prevention syringe of the present invention, wherein, the maximum radial width of this bearing surface equals the internal diameter of this injection tube, and amplexiforms face one of the bottom of this bearing surface formation.
Blood return prevention syringe of the present invention, wherein, this annular groove is divided into several sections in the axial direction, and adjacent to the external diameter of the section of the face that amplexiforms of this chock external diameter less than other section.
Blood return prevention syringe of the present invention, wherein, the maximum radial width of this bearing surface is less than the internal diameter of this injection tube.
Blood return prevention syringe of the present invention, wherein, this annular groove is divided into several sections in the axial direction, and the external diameter of the section of contiguous this bearing surface is less than the external diameter of other section, and the section of contiguous this bearing surface is communicated with the free end of this chock.
Blood return prevention syringe of the present invention, wherein, this resilient sleeve has an extension, and this extension is extended to the axle center of this push rod free-ended end face that should chock by this resilient sleeve and forms, and this extension fits in the free-ended section that this annular groove is communicated with this chock.
What the present invention provided a kind of blood return prevention syringe in addition pushes away the liquid assembly, and it comprises: a push rod, an end are provided with a chock, and this chock has a bearing surface; And a resilient sleeve, being provided with a through hole that runs through vertically, this resilient sleeve is sleeved on this chock, and the bearing surface of this chock is exposed to outside the through hole of this resilient sleeve.Again, the periphery wall of this chock can be provided with an annular groove, and this resilient sleeve is incorporated into this annular groove.
Blood return prevention syringe of the present invention, the bearing surface of chock is exposed to outside the through hole of this resilient sleeve, so that push rod can be with the dispensing end internal perisporium of the minimum chock butt injection tube of coefficient of elasticity, so can when user stops to push push rod, not produce " blood back " phenomenon, in the time of can avoiding implementing intravenous drip, the situation of clot artery-clogging occurs, so have the effect that promotes injection safety.
Blood return prevention syringe of the present invention, be exposed to the outer feature of through hole of this resilient sleeve by the bearing surface that makes chock, make the bearing surface of chock can be directly and the dispensing end internal perisporium butt of injection tube, rather than with the dispensing end internal perisporium of resilient sleeve butt injection tube, even so the chock of push rod and resilient sleeve between have in the axial direction the space, this space also can not be compressed and cause " blood back " phenomenon.
Description of drawings
Fig. 1: a kind of profile of existing syringe.
Fig. 2: the three-dimensional exploded view of first embodiment of the invention.
Fig. 3: the assembled sectional view of first embodiment of the invention.
Fig. 4: the enforcement sketch map of first embodiment of the invention.
Fig. 5: the three-dimensional exploded view of second embodiment of the invention.
Fig. 6: the enforcement sketch map of second embodiment of the invention.
Wherein:
(the present invention)
1 injection tube, 11 rooms
12 dispensing ends, 13 openings
131 Extendible flakes, 14 junction surfaces
2 push rods, 21 chocks
21 ' chock, 211 bearing surfaces
211 ' bearing surface 212 amplexiforms face
213 annular grooves, 213 ' annular groove
213a the first section 213b the second section
213c the 3rd section 213d the 4th section
22 operating portions
3 resilient sleeve, 31 through holes
32 extensions
4 injection needles
(having now)
9 syringes, 91 injection tubes
911 dispensing ends, 912 openings
92 push rods, 921 operating portions
922 chocks, 93 resilient sleeve
94 injection needles
The G space
The specific embodiment
For above-mentioned and other purpose, feature and advantage of the present invention can be become apparent, preferred embodiment of the present invention cited below particularly, and cooperate accompanying drawing, be described in detail below:
See also Fig. 2,3, for stereo decomposing and the combination of first embodiment of the invention are analysed and observe.In the present embodiment, this blood return prevention syringe comprises an injection tube 1 and and pushes away the liquid assembly, and this pushes away the liquid assembly and has a push rod 2 and a resilient sleeve 3; The coefficient of elasticity of this resilient sleeve 3 is much larger than the coefficient of elasticity of this push rod 2, and this resilient sleeve 3 is incorporated into this push rod 2, and 2 of this push rods are arranged in this injection tube 1.
One end of push rod 2 is provided with a chock 21, and in the present embodiment, this chock 21 is made by the minimum material of coefficient of elasticity (such as plastics, glass etc.) and had a fixing external form.This chock 21 can with these push rod 2 one-body molded manufacturings, or be incorporated into an end of this push rod 2, the present invention is not limited.
This chock 21 has a bearing surface 211, and this push rod 2 is arranged in the room 11 of this injection tube 1, and this bearing surface 211 is towards the dispensing end 12 of this injection tube 1, and can fit in dispensing end 12 internal perisporiums of injection tube 1.In the present embodiment, the dispensing end 12 of injection tube 1 is funnel type, so 211 corresponding conicoids that form of the bearing surface of chock 21, and the maximum radial width of this bearing surface 211 approximates the internal diameter of injection tube 1, and form one in the bottom of taper bearing surface 211 and amplexiform face 212, and this amplexiforms face 212 preferred parallel in chock 21 radially.
Again, the periphery wall of chock 21 is provided with an annular groove 213 for resilient sleeve 3 combinations of correspondence, this annular groove 213 can be divided into several sections with different external diameters in the axial direction, in the present embodiment, this annular groove 213 can be divided into one first section 213a and one second section 213b, the face that amplexiforms 212 of the contiguous chock 21 of this first section 213a, and the external diameter of this first section 213a is less than the external diameter of this second section 213b.
The other end of push rod 2 convexedly stretches in outside the opening 13 of injection tube 1, and is provided with an operating portion 22, and these operating portion 22 usefulness are pressed for user, and causes chock 21 mobile in the room 11 of injection tube 1.In the present embodiment, push rod 2 can be selected to be made as the cross push rod and have good structural strength, the problem of buckling (buckling) occurs when being not easy to carry out the action of pushing, and for pressing conveniently, this operating portion 22 can be to be combined in push rod 2 free-ended disk bodies, and this disk body can have any shape.
Wherein, the external diameter of resilient sleeve 3 approximates or is slightly larger than the internal diameter of injection tube 1, and the internal diameter of resilient sleeve 3 then cooperates the external diameter of annular groove 213 each section of chock 21 to change and arranges.Resilient sleeve 3 can be sleeved in the annular groove 213 of chock 21, but may have in the junction a little space; Perhaps, resilient sleeve 3 can be directly molded in the annular groove 213 of chock 21 directly by the technique of ejection formation, and resilient sleeve 3 and chock 21 can be combined closely.
See also Fig. 3, structure accordingly, when an end that is provided with chock 21 when push rod 2 is filled in the room 11 of injection tube 1, the resilient sleeve 3 that is combined in chock 21 periphery walls can be slightly by radial compression, so that chock 21 can with the internal perisporium driving fit of injection tube 1, and in the process of pushing push rod 2, all keep driving fit and advance to the dispensing end 12 of injection tube 1 with the injection that drive is installed in room 11, and flow out by this injection needle 4.
In addition, the face that amplexiforms 212 places at contiguous chock 21, because of the first section 213a external diameter of annular groove 213 less, so that resilient sleeve 3 is the larger form of thickness in the position of correspondence, can increase the contact area of the face that amplexiforms 212 of resilient sleeve 3 and chock 21, so that resilient sleeve 3 can be in mobile process, because resilient sleeve 3 and the frictional force of injection tube 1 internal perisporium are peeled off from the annular groove 213 of chock 21.
See also Fig. 4, when push rod 2 is pushed to the end, be exposed to the bearing surface 211 of through hole 31 chock 21 outward of resilient sleeve 3, can fit with dispensing end 12 internal perisporiums of injection tube 1.Wherein, owing to chock 21 is made by the minimum material of coefficient of elasticity and is had fixing external form, when therefore the bearing surface 211 of chock 21 is fitted with dispensing end 12 internal perisporiums of injection tube 1, the bearing surface 211 of chock 21 can't be because pressurized produces distortion, so can not form negative pressure at 14 places, junction surface of injection tube 1; Accordingly, when user stops to push push rod 2, namely can in injection needle 4, not produce the suction of pumpback, so can effectively avoid producing " blood back " phenomenon.
In addition, because what fit with dispensing end 12 internal perisporiums of injection tube 1 is the bearing surface 211 that is exposed to the outer chock 21 of the through hole 31 of resilient sleeve 3, therefore, be incorporated into resilient sleeve 3 in the annular groove 213 of chock 21 even select in the fit mode, in the axial direction space between this resilient sleeve 3 and chock 21, also can in injection process, not be compressed and 14 places, junction surface of injection tube 1 are formed negative pressure, so still can effectively avoid causing " blood back " phenomenon.
See also Fig. 5, Fig. 6, be three-dimensional exploded view and the enforcement sketch map of second embodiment of the invention.The second embodiment of the present invention is same as the first embodiment haply, and they are different locates only to be the variation of chock 21 ' and resilient sleeve 3 ', so following in detail all the other identical features will be described in detail no longer.
The free end of chock 21 ' forms a bearing surface 211 ', dispensing end 12 place's shapes of this bearing surface the 211 ' corresponding injection tube 1 and be taper, and the maximum radial width of this bearing surface 211 ' is less than the internal diameter of injection tube 1.Again, the periphery wall of chock 21 ' is provided with an annular groove 213 ' for the resilient sleeve 3 ' combination of correspondence, this annular groove 213 ' can be divided into several sections with different external diameters in the axial direction, in the present embodiment, this annular groove 213 ' can be divided into one the 3rd section 213c and one the 4th section 213d, the bearing surface 211 ' of the contiguous chock 21 ' of the 3rd section 213c, the external diameter of the 3rd section 213c is less than the external diameter of the 4th section 213d, and the 3rd section 213c is communicated with the free end of chock 21 '.
Moreover, resilient sleeve 3 ' can also be provided with an extension 32, this extension 32 is by the free-ended end face of resilient sleeve the 3 ' corresponding chock 21 ', extend a predeterminable range to the axle center of push rod 2 and form, so that this resilient sleeve 3 ' is when being incorporated into the annular groove 213 ' of chock 21 ', the extension 32 of this resilient sleeve 3 ' can fit in the 3rd section 213c, and the bearing surface 211 ' of keeping chock 21 ' can be exposed to outside the through hole 31 ' of this resilient sleeve 3 '.
See also Fig. 6, structure accordingly, in the process of pushing push rod 2, chock 21 ' can be borrowed resilient sleeve 3 ' and keep driving fit with the internal perisporium of injection tube 1, and when push rod 2 is pushed to the end, the extension 32 of resilient sleeve 3 ' and the bearing surface 211 ' of chock 21 ' can be jointly and dispensing end 12 internal perisporiums of injection tube 1 fit.In the present embodiment and since corresponding to 14 places, junction surface of injection tube 1 be still the minimum chock 21 ' of coefficient of elasticity, therefore can have equally the effect of effectively avoiding producing " blood back " phenomenon.
In sum, blood return prevention syringe of the present invention, the bearing surface of chock is exposed to outside the through hole of this resilient sleeve, so that push rod can be with the dispensing end internal perisporium of the minimum chock butt injection tube of coefficient of elasticity, so can when user stops to push push rod, not produce " blood back " phenomenon, in the time of can avoiding implementing intravenous drip, the situation of clot artery-clogging occurs, so have the effect that promotes injection safety.
Blood return prevention syringe of the present invention, be exposed to the outer feature of through hole of this resilient sleeve by the bearing surface that makes chock, make the bearing surface of chock can be directly and the dispensing end internal perisporium butt of injection tube, rather than with the dispensing end internal perisporium of resilient sleeve butt injection tube, even so the chock of push rod and resilient sleeve between have in the axial direction the space, this space also can not be compressed and cause " blood back " phenomenon.
Only the above person only is preferred embodiment of the present invention, when not limiting the scope of the present invention with this; So all simple equivalences of doing according to the present patent application claim and description of the invention content change and modify, all should still belong in the scope that patent of the present invention contains.
Claims (9)
1. blood return prevention syringe is characterized in that it comprises:
An injection tube is hollow form and an end and forms a dispensing end; And
One pushes away the liquid assembly, have a push rod and a resilient sleeve, one end of this push rod is provided with a chock, this chock has a bearing surface, this push rod is arranged in this injection tube, and this bearing surface is towards the dispensing end of this injection tube, and this resilient sleeve is provided with a through hole that runs through vertically, this resilient sleeve is sleeved on this chock, and the bearing surface of this chock is exposed to outside the through hole of this resilient sleeve.
2. blood return prevention syringe according to claim 1, it is characterized in that: the periphery wall of this chock is provided with an annular groove, and this resilient sleeve is incorporated into this annular groove.
3. blood return prevention syringe according to claim 2, it is characterized in that: the maximum radial width of this bearing surface equals the internal diameter of this injection tube, and forms one in the bottom of this bearing surface and amplexiform face.
4. blood return prevention syringe according to claim 3, it is characterized in that: this annular groove is divided into several sections in the axial direction, and adjacent to the external diameter of the section of the face that amplexiforms of this chock external diameter less than other section.
5. blood return prevention syringe according to claim 2, it is characterized in that: the maximum radial width of this bearing surface is less than the internal diameter of this injection tube.
6. blood return prevention syringe according to claim 5, it is characterized in that: this annular groove is divided into several sections in the axial direction, the external diameter of the section of contiguous this bearing surface is less than the external diameter of other section, and the section of contiguous this bearing surface is communicated with the free end of this chock.
7. blood return prevention syringe according to claim 6, it is characterized in that: this resilient sleeve has an extension, this extension is extended to the axle center of this push rod free-ended end face that should chock by this resilient sleeve and forms, and this extension fits in the free-ended section that this annular groove is communicated with this chock.
A blood return prevention syringe push away the liquid assembly, it is characterized in that comprising:
A push rod, an end are provided with a chock, and this chock has a bearing surface; And
A resilient sleeve is provided with a through hole that runs through vertically, and this resilient sleeve is sleeved on this chock, and the bearing surface of this chock is exposed to outside the through hole of this resilient sleeve.
Blood return prevention syringe according to claim 8 push away the liquid assembly, it is characterized in that: the periphery wall of this chock is provided with an annular groove, and this resilient sleeve is incorporated into this annular groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102413202A CN102949765A (en) | 2011-08-22 | 2011-08-22 | Anti-backflow syringe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102413202A CN102949765A (en) | 2011-08-22 | 2011-08-22 | Anti-backflow syringe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102949765A true CN102949765A (en) | 2013-03-06 |
Family
ID=47759521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102413202A Pending CN102949765A (en) | 2011-08-22 | 2011-08-22 | Anti-backflow syringe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102949765A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0925798A2 (en) * | 1997-12-24 | 1999-06-30 | Bracco International B.V. | Easy-slip plunger/plunger rod assembly for a syringe or a cartridge |
| US6004300A (en) * | 1997-08-28 | 1999-12-21 | Butcher; Robert M | Composite hypodermic syringe piston |
| EP1002551A2 (en) * | 1998-11-19 | 2000-05-24 | Bracco International B.V. | Easy-slip plunger/plunger rod assembly for a syringe or a cartridge |
| CN101252961A (en) * | 2005-08-29 | 2008-08-27 | 韦斯特制药服务公司 | Dual material plunger tip for use with a syringe |
-
2011
- 2011-08-22 CN CN2011102413202A patent/CN102949765A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6004300A (en) * | 1997-08-28 | 1999-12-21 | Butcher; Robert M | Composite hypodermic syringe piston |
| EP0925798A2 (en) * | 1997-12-24 | 1999-06-30 | Bracco International B.V. | Easy-slip plunger/plunger rod assembly for a syringe or a cartridge |
| EP1002551A2 (en) * | 1998-11-19 | 2000-05-24 | Bracco International B.V. | Easy-slip plunger/plunger rod assembly for a syringe or a cartridge |
| CN101252961A (en) * | 2005-08-29 | 2008-08-27 | 韦斯特制药服务公司 | Dual material plunger tip for use with a syringe |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130306 |