CN102346195B - Liquid-sensitivity type sampling needle - Google Patents
Liquid-sensitivity type sampling needle Download PDFInfo
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- CN102346195B CN102346195B CN 201010240710 CN201010240710A CN102346195B CN 102346195 B CN102346195 B CN 102346195B CN 201010240710 CN201010240710 CN 201010240710 CN 201010240710 A CN201010240710 A CN 201010240710A CN 102346195 B CN102346195 B CN 102346195B
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- liquid
- sampling needle
- outer tube
- sensitivity type
- type sampling
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- 238000005070 sampling Methods 0.000 title claims abstract description 65
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 238000009413 insulation Methods 0.000 claims abstract description 6
- 239000004809 Teflon Substances 0.000 claims description 16
- 229920006362 Teflon® Polymers 0.000 claims description 16
- 239000000084 colloidal system Substances 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000011161 development Methods 0.000 abstract description 2
- 238000005498 polishing Methods 0.000 description 17
- 229910001220 stainless steel Inorganic materials 0.000 description 17
- 239000010935 stainless steel Substances 0.000 description 17
- 239000003822 epoxy resin Substances 0.000 description 16
- 229920000647 polyepoxide Polymers 0.000 description 16
- 239000000463 material Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 238000005507 spraying Methods 0.000 description 10
- 238000013461 design Methods 0.000 description 9
- 239000012530 fluid Substances 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 238000007669 thermal treatment Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 5
- 239000010963 304 stainless steel Substances 0.000 description 4
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 238000000502 dialysis Methods 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004159 blood analysis Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000028327 secretion Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002562 urinalysis Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Abstract
The invention relates to a liquid-sensitivity type sampling needle which is characterized by consisting of an inner tube (1) and an outer tube (2), wherein a gap of 0.10-1.50mm is arranged between the inner tube (1) and the outer tube (2); and electric insulation exists between the inner tube (1) and the outer tube (2). Compared with the prior art, the liquid-sensitivity type sampling needle is aproduct of rapid development of an analytical instrument, adapts to the requirements of a detection instrument which enters a full-automatic stage, and is capable of automatically sampling contact liquid in a quantitative way and automatically breaking off sample liquid.
Description
Technical field:
The present invention relates to liquid is automatic in the fully automatic liquid analytical instrument, quantitative sampling is used sampling needle material, design, principle and reach the requirement to processing technology, a kind of liquid-sensitivity type sampling needle of being made by stainless steel, Teflon material is provided especially.
Background technology:
In the prior art, composition analysis instrument (for example biochemical analyzer, blood analysis instrument, urinalysis instrument, and chemical industry, petroleum industry composition analysis instrument commonly used) when test operation, first step operation is exactly collected specimens liquid, and this needs sampling needle.
In the prior art, the most common sampling needle is simple straight tube, and the visual sampling needle of operation detection personnel touches the liquid level of sample liquid, manual collected specimens liquid.The instrument of this mode is open, and the sample liquid consumption is uncontrollable, and speed is slow, low precision.
People expect to obtain preferably liquid-sensitivity type sampling needle of a kind of technique effect.
Summary of the invention:
The purpose of this invention is to provide a kind of liquid-sensitivity type sampling needle, the design and crafts such as reverse taper design, the anti-coating that gets wet of centrum surface Teflon are held in inner and outer pipes insulating Design, sampling, guarantee the fully-automatic analyzer liquid-sensitivity type sampling needle of liquid Contact recognition, automatic collected specimens liquid, automatic dialysis.
The invention provides a kind of liquid-sensitivity type sampling needle, it is characterized in that: its inner tube (1) forms with outer tube (2); Leave the gap of 0.10～1.50mm between inner tube (1) and the outer tube (2); Electrical isolation between inner tube (1) and the outer tube (2).
Inner tube after bonding (1) links to each other with the control circuit of analytical instrument inside respectively with outer tube (2).
In the liquid-sensitivity type sampling needle of the present invention, also include following preferred content and require:
Filling insulation colloid in the gap between inner tube (1) and the outer tube (2).Clearance filled insulation colloid, non-conductive between inner tube (1) and the outer tube (2).
Leave the gap of 0.10～0.50mm between described inner tube (1) and the outer tube (2).This gap location is filled electrically insulating material.
In the described liquid-sensitivity type sampling needle, the end structure that is used for contacting with liquid is specially with managing and axially is 25～40 ° reverse taper.The purpose that designs this structure is: can break away from appearance surfaces for guaranteeing test post-sampling liquid.
In the described liquid-sensitivity type sampling needle, be used for termination that liquid contacts near cone surface or the sudden and violent whole outside surfaces that leak outside be coated with Teflon, its thickness is 0.02～0.1mm.---in order to guarantee thoroughly hydrophobic.
In the described liquid-sensitivity type sampling needle, be used for termination that liquid contacts near outer tube (2) end exposed metal/bare metal outside.To expose metal at the end of reverse taper outer tube 2, in order to improve electric signal to the consistance of the reaction of liquid.
In the described liquid-sensitivity type sampling needle, the external diameter of outer tube 2 is 1.8～2.5mm, and internal diameter is 1.2～1.5mm; The external diameter of inner tube is 0.8～1.2mm, and internal diameter is 0.4～0.9mm.
Described liquid-sensitivity type sampling needle does not have specific (special) requirements away from the concrete structure of the other end of sampling end.Circuit connecting section is divided can be according to the designed, designeds such as space appearance of testing tool.
Structural design emphasis of the present invention comprises two parts content: the design of the piquid-sensitive part of the first, before the contact sample liquid, separate with insulating gel between inner tube 1 and the outer tube 2 of conduction (stainless steel) material, non-conductive between inner tube 1 and the outer tube 2, because sample aqueous solution is the conductor of electricity, when sampling needle contact or when leaving sample liquid, the control electric current also can conducting or dialysis, thereby the action of control micro motor realizes automatically sampling.It two is the back taper designs and cone surface teflon coatings of getting the liquid end, realizes that dialysis rear surface no liquid residue retains, and is convenient to enter next time sampling action.
The preferred material stainless steel that the inner tube 1 of liquid-sensitivity type sampling needle of the present invention and outer tube 2 the most often use is the conductor of electricity, and aqueous solution also is the conductor of electricity.If the action that adopt electric signal control contact, sampling, separates, the conducting that need to cooperate in the one-piece construction of sampling needle electric signal with separate to realize.The internal diameter of stainless steel outer tube 2 is greater than the external diameter of stainless steel inner tube 1, and the secretion insulation colloid that leaves between the two after solidifying, is nonconducting between inner tube 1 and the outer tube 2.When sampling needle touches sample liquid, sample liquid enters respectively inner tube 1, and be centered around on outer tube 2 tube walls, because the electric action of sample aqueous solution, the conducting that satisfies condition of the inner tube 1 that links to each other with the analyser current control system, outer tube 2, the analytical instrument automatic system starts, and micro motor is started working, and can gather micro-example liquid.After a certain amount of sample liquid extracted, liquid level descended, and inner tube 1 is again state of insulation with outer tube 2, and control system quits work, and analytical instrument is finished sampling operation one time.
Automatically sampling is batch, continuous working, and after sample liquid gathered, next group sample will enter test mode at once.If the sample liquid that gathered last time also remains in outer tube 2 surfaces, then the sample of test next time will be contaminated, and then affect measuring accuracy, so the tactile liquid end of sampling needle needs particular design and processing.There are intermolecular force in aqueous solution and metal surface, and in the straight tube situation, the outside surface of outer tube 2 is always wanted the sample liquid of residual minim, when being polished to 8 grades of roughness, still have the drop of diameter 0.5mm.For overcome liquid and outer tube minute between acting force, will touch the liquid end and be designed to back taper.Experiment shows, during 30 ° of angles, easily process, and liquid residue is less.In order thoroughly to solve the liquid residue problem, the back taper after the polishing is touched liquid end spraying hydrophobic type Teflon, experiment shows, in the situation that the teflon coatings surface does not have pin hole, bubble, there is not residual liquid in net weight power lower surface.
In terms of existing technologies, piquid-sensitive sampling needle of the present invention is the product of analytical instrument fast development, and it adapts to the requirement that detecting instrument enters Full-automatic stage, can realize the sampling of contact liq automatic ration, automatically the liquid-sensitivity type sampling needle of dialysis sample liquid.
Description of drawings:
Fig. 1 is traditional straight pipe type liquid-sensitivity type sampling needle structural representation;
Fig. 2 is described liquid-sensitivity type sampling needle structural principle schematic diagram; Number designation 3 expressions is the Teflon layer 3 that spraying forms among Fig. 2;
Fig. 3 is the liquid-sensitivity type sampling needle principle schematic under the use state.
Embodiment:
A kind of liquid-sensitivity type sampling needle (as shown in Figure 2), material are selected medical 304 stainless-steel tubes.The external diameter of outer tube is 2.0mm, and internal diameter is 1.2mm; The external diameter of inner tube is 0.8mm, and internal diameter is 0.5mm.With epoxy resin interior tube-surface is smoothened, 50 ° be heating and curing after, polishing evenly evenly is coated with one deck epoxy resin again, and inner and outer pipes is nested together, and solidifies through same process.
One section car of the stainless-steel tube after will solidifying with lathe becomes 30 ° of cones, and through polishing, the thick Teflon colloid of spraying 0.05mm is equilibrium surface coverage after 40 ° of thermal treatments.Sampling needle overall length 200mm.Examination with computer is the result show, sampling operation is responsive, and is quantitatively accurate, not residual sample fluid.
Material is selected medical 304 stainless-steel tubes.The external diameter of outer tube is 2.2mm, and internal diameter is 1.3mm; The external diameter of inner tube is 0.9mm, and internal diameter is 0.6mm.With epoxy resin interior tube-surface is smoothened, 50 ° be heating and curing after, polishing evenly evenly is coated with one deck epoxy resin again, and inner and outer pipes is nested together, and solidifies through same process.
One section car of the stainless-steel tube after will solidifying with lathe becomes 28 ° of cones, and through polishing, the thick Teflon colloid of spraying 0.05mm is equilibrium surface coverage after 40 ° of thermal treatments.Sampling needle overall length 150mm.Examination with computer is the result show, sampling operation is responsive, and is quantitatively accurate, not residual sample fluid.
Material is selected medical 304 stainless-steel tubes.The external diameter of outer tube is 2.4mm, and internal diameter is 1.5mm; The external diameter of inner tube is 1.1mm, and internal diameter is 0.8mm.With epoxy resin interior tube-surface is smoothened, 50 ° be heating and curing after, polishing evenly evenly is coated with one deck epoxy resin again, and inner and outer pipes is nested together, and solidifies through same process.
One section car of the stainless-steel tube after will solidifying with lathe becomes 32.5 ° of cones, and through polishing, the thick Teflon colloid of spraying 0.05mm is equilibrium surface coverage after 40 ° of thermal treatments.Sampling needle overall length 90mm.Examination with computer is the result show, sampling operation is responsive, and is quantitatively accurate, not residual sample fluid.
Embodiment 4
Material is selected medical 304 stainless-steel tubes.The external diameter of outer tube is 1.8mm, and internal diameter is 1.2mm; The external diameter of inner tube is 0.9mm, and internal diameter is 0.5mm.With epoxy resin interior tube-surface is smoothened, 50 ° be heating and curing after, polishing evenly evenly is coated with one deck epoxy resin again, and inner and outer pipes is nested together, and solidifies through same process.
One section car of the stainless-steel tube after will solidifying with lathe becomes 20 ° of cones, and through polishing, the thick Teflon colloid of spraying 0.05mm is equilibrium surface coverage after 40 ° of thermal treatments.Sampling needle overall length 120mm.Examination with computer is the result show, sampling operation is responsive, and is quantitatively accurate, not residual sample fluid.
Embodiment 5
Material is selected medical 306 stainless-steel tubes.The external diameter of outer tube is 2.0mm, and internal diameter is 1.2mm; The external diameter of inner tube is 0.8mm, and internal diameter is 0.4mm.With epoxy resin interior tube-surface is smoothened, 50 ° be heating and curing after, polishing evenly evenly is coated with one deck epoxy resin again, and inner and outer pipes is nested together, and solidifies through same process.
One section car of the stainless-steel tube after will solidifying with lathe becomes 40 ° of cones, and through polishing, the thick Teflon colloid of spraying 0.05mm is equilibrium surface coverage after 40 ° of thermal treatments.Sampling needle overall length 120mm.Examination with computer is the result show, sampling operation is responsive, and is quantitatively accurate, not residual sample fluid.
Embodiment 6
Material is selected medical 306 stainless-steel tubes.The external diameter of outer tube is 2.2mm, and internal diameter is 1.3mm; The external diameter of inner tube is 0.9mm, and internal diameter is 0.5mm.With epoxy resin interior tube-surface is smoothened, 50 ° be heating and curing after, polishing evenly evenly is coated with one deck epoxy resin again, and inner and outer pipes is nested together, and solidifies through same process.
One section car of the stainless-steel tube after will solidifying with lathe becomes 30 ° of cones, and through polishing, the thick Teflon colloid of spraying 0.05mm is equilibrium surface coverage after 40 ° of thermal treatments.Sampling needle overall length 150mm.Examination with computer is the result show, sampling operation is responsive, and is quantitatively accurate, not residual sample fluid.
Embodiment 7
Material is selected medical 306 stainless-steel tubes.The external diameter of outer tube is 2.5mm, and internal diameter is 1.5mm; The external diameter of inner tube is 1.2mm, and internal diameter is 0.9mm.With epoxy resin interior tube-surface is smoothened, 50 ° be heating and curing after, polishing evenly evenly is coated with one deck epoxy resin again, and inner and outer pipes is nested together, and solidifies through same process.
One section car of the stainless-steel tube after will solidifying with lathe becomes 30 ° of cones, and through polishing, the thick Teflon colloid of spraying 0.05mm is equilibrium surface coverage after 40 ° of thermal treatments.Sampling needle overall length 90mm.Examination with computer is the result show, sampling operation is responsive, and is quantitatively accurate, not residual sample fluid.
Embodiment 8
Material is selected medical 306 stainless-steel tubes.The external diameter of outer tube is 1.8mm, and internal diameter is 1.2mm; The external diameter of inner tube is 0.9mm, and internal diameter is 0.4mm.With epoxy resin interior tube-surface is smoothened, 50 ° be heating and curing after, polishing evenly evenly is coated with one deck epoxy resin again, and inner and outer pipes is nested together, and solidifies through same process.
One section car of the stainless-steel tube after will solidifying with lathe becomes 30 ° of cones, and through polishing, the thick Teflon colloid of spraying 0.05mm is equilibrium surface coverage after 40 ° of thermal treatments.Sampling needle overall length 100mm.Examination with computer is the result show, sampling operation is responsive, and is quantitatively accurate, not residual sample fluid.
Claims (4)
1. liquid-sensitivity type sampling needle, its inner tube (1) forms with outer tube (2); Leave the gap of 0.10～1.50mm between inner tube (1) and the outer tube (2); Filling insulation colloid in the gap between inner tube (1) and the outer tube (2), electrical isolation between inner tube (1) and the outer tube (2), it is characterized in that: in the described liquid-sensitivity type sampling needle, the end structure that is used for contacting with liquid is specially with managing and axially is 25～40 ° reverse taper.
2. according to the described liquid-sensitivity type sampling needle of claim 1, it is characterized in that: in the described liquid-sensitivity type sampling needle, be used for termination that liquid contacts near cone surface or the sudden and violent whole outside surfaces that leak outside be coated with Teflon, its thickness is 0.02～0.1mm.
3. according to the described liquid-sensitivity type sampling needle of claim 2, it is characterized in that: in the described liquid-sensitivity type sampling needle, be used for termination that liquid contacts near outer tube (2) end exposed metal/bare metal outside.
4. according to one of them described liquid-sensitivity type sampling needle of claim 1～3, it is characterized in that: in the described liquid-sensitivity type sampling needle, the external diameter of outer tube is 1.8～2.5mm, and internal diameter is 1.2～1.5mm; The external diameter of inner tube is 0.8～1.2mm, and internal diameter is 0.4～0.9mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010240710 CN102346195B (en) | 2010-07-30 | 2010-07-30 | Liquid-sensitivity type sampling needle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010240710 CN102346195B (en) | 2010-07-30 | 2010-07-30 | Liquid-sensitivity type sampling needle |
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| Publication Number | Publication Date |
|---|---|
| CN102346195A CN102346195A (en) | 2012-02-08 |
| CN102346195B true CN102346195B (en) | 2013-10-23 |
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| CN 201010240710 Expired - Fee Related CN102346195B (en) | 2010-07-30 | 2010-07-30 | Liquid-sensitivity type sampling needle |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106950390A (en) * | 2017-04-20 | 2017-07-14 | 合肥迪安医学检验所有限公司 | Biochemical instruments blood sample automatic sample detecting head |
| CN112547462B (en) * | 2020-11-23 | 2022-12-09 | 重庆大学 | Preparation method of wear-resistant super-hydrophobic coating on surface of sampling needle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2181689Y (en) * | 1993-11-17 | 1994-11-02 | 范发荣 | Blood internal and external tube micro-sampling and diluting device |
| CN101089587A (en) * | 2007-06-12 | 2007-12-19 | 北京大学 | Multi-branch gas sampling pipe |
| CN101566549A (en) * | 2009-05-27 | 2009-10-28 | 重庆天海医疗设备有限公司 | Sampling/measuring needle of blood viscosity measurement device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09127131A (en) * | 1995-10-31 | 1997-05-16 | Hitachi Ltd | Automatic analyzing device |
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2010
- 2010-07-30 CN CN 201010240710 patent/CN102346195B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2181689Y (en) * | 1993-11-17 | 1994-11-02 | 范发荣 | Blood internal and external tube micro-sampling and diluting device |
| CN101089587A (en) * | 2007-06-12 | 2007-12-19 | 北京大学 | Multi-branch gas sampling pipe |
| CN101566549A (en) * | 2009-05-27 | 2009-10-28 | 重庆天海医疗设备有限公司 | Sampling/measuring needle of blood viscosity measurement device |
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| CN102346195A (en) | 2012-02-08 |
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