CN86200931U

CN86200931U - Pipette and airpocket with airpocket

Info

Publication number: CN86200931U
Application number: CN 86200931
Authority: CN
Inventors: 周朝相
Original assignee: Individual
Current assignee: Individual
Priority date: 1986-02-14
Filing date: 1986-02-14
Publication date: 1986-11-05

Abstract

The utility model relates to a pipette and airpocket with an airpocket, which belongs to an instrument usually used in a laboratory. The utility model has the advantages of high safety, simple structure, low cost, convenient and safe usage and rapid, quick and accuracy operation, solving the defects of difficult control and inefficient working existing in the existing pipette and airpocket. On the basis of the existing instrument, air holes are arranged on the pipe wall of the tail end and the airpocket is arranged on the tail end of the utility model.

Description

Pipette and airpocket with airpocket

The utility model belongs to laboratory glass apparatus commonly used.Pipette is used for pipetting exactly certain amount of fluid, and pipette is used for pipetting exactly the liquid of various different amounts.

Pipette that past continues to use always and pipette do not have improvement so far.Nineteen fifty-two is shown listed pipette figure and using method in " chemical experimental instrument and use thereof " book year by Zhang Xiyu, yellow Peng that the Commercial Press publishes, in " the lab technician's reader " published by Chemical Industry Press with September nineteen eighty-three, the Liu Zhen of Beijing Chemical Engineering College edits listed figure and using method one to.Present industrial mass-producted approved product, in its using method and shape and above-mentioned " lab technician's reader " book the content complete of institute's book to.

Above-mentioned existing pipette has in the middle of being and expands the glass tube of part (being called the bulb), and the upper and lower is thin narrow neck, and outlet is contracted to very little.An annular graticule is carved with on neck top, is illustrated in the volume that shifts out under the uniform temperature.And pipette is the glass tube with scale division, can shift the solution of different volumes.These two kinds of instrument draw solution must with the hands be operated.In use need to pin the mouth of pipe, if draw poisonous, severe corrosive solution and germ nutrient solution, in displacement inwall moisture process, can be poured on hand the injury operator accidentally with forefinger.Owing to use the ear washing bulb draw solution, if pinching the finger of ear washing bulb, the operator loosens excessively, will suck ear washing bulb internal contamination solution to solution, therefore in operational procedure, emphasize and will slowly suck.The pipette of low capacity particularly, more difficult control.Require certain moist degree to pinning finger suitable for reading during use.The finger overdrying easily leaks gas, owing between the finger and the mouth of pipe one deck liquid film is arranged, treats that finger and mouth of pipe gap widened liquid film and just break when pointing the tide venting, air inlet suddenly, and it is too fast that the solution meniscus is descended, and often causes and let slip scale.And point moist degree, often with on every side weather, operating process, operator's physiological condition etc. are relevant.Even moist degree meets the requirements, but because of delicate reasons such as orifice configuration, sand hair degree, still need and rotate pipe shaft when regulating liquid level, operating to have certain experience and technology, often varies with each individual.In addition, if require under aseptic condition, to use, sometimes in advance will be in mouth of pipe plug cotton, cotton plug is must degree of tightness suitable, the formality trouble.Operating with ear washing bulb in sterile board especially, is very much inconvenience.

The purpose of this utility model is that a kind of easy-to-use, safe and reliable, quick, quick, accurate and simple in structure, with low cost pipette and pipette of operation will be provided.

The utility model is achieved like this: on the afterbody tube wall of aforementioned existing pipette (1), pipette (2), open one or more aperture (3), and on pipe, mark the position and the size of aperture.On the pipe afterbody degree of tightness and suitable length, by the pipe box (4) that elastomeric material is made, make the lower edge of pipe box can just bottle up aperture.Set up the suction air (5) of volume energy compression at the port of pipe.The size of suction air, with shrivel fully the back relieving can be drawn onto the meniscus of solution more than the scale, be not as the criterion but do not reach pore.

This utility model pipette, pipette using method are as follows:

1, washing

Available running water washing is cleaned with distilled water again.When the wall hanging globule (interior) available chromic acid lotion is cleaned when dirtier.Its washing methods is: shrivel suction air, the end opening of pipe inserts in the washing lotion, decontrols suction air, in the washing lotion suction line, after hanging on, washing lotion is put back in the former bottle.When being immersed in the washing lotion if desired for a long time, suction air can be pulled up, clean in addition.Glass tube part soaking and washing method and original pipette, pipette are identical.

2, draw solution

Right-handed thumb pinches the sleeve pipe place of pipette or pipette upper end elastomeric material, shrivels suction air with forefinger, and the end opening insertion of pipe is desired to get in the solution, inserts too not shallow or too dark.Decontrol the forefinger of pressing suction air then, solution is drawn to more than the scale, take out pipette or pipette then, press suction air that solution is emitted and discarded from the end opening of pipe with forefinger.So with after desiring to get solution drip washing 2-3 time, promptly desirable solution is to scale.If solution is less or more expensive, can be after pipette or pipette insert solution, suitable suction pipe capacity about 1/3, take out, horizontal holding, and turne tube makes solution touch scale with the upper part, displacement inwall moisture is emitted solution then and is discarded from the end opening of pipe.So, get final product draw solution to scale with desiring to get solution drip washing 2-3 time.

3, regulate liquid level

Pipette or pipette upwards promoted leave liquid level, the end of pipe still leans against to be contained on the solution vessel inwall, pipe shaft is kept upright, with forefinger and the selected a certain size pore orientation of thumb, pinching elastomeric material pipe box, make and form a slit between itself and the tube wall, air promptly by the slit in pore enters pipe.If not pinching elastomeric material pipe box also can, just push the pipe box lower edge aside and cover selected pore place with thumb or forefinger, air is promptly entered in the pipe by pore.Selected hole diameter size promptly determines the speed that the solution meniscus descends.The pore air inlet meniscus decrease speed of minor diameter is slow, and major diameter pore meniscus decrease speed is fast.Treat that solution meniscus bottom and graticule are tangent, can stop pinching or take off pipe box that allow the pipe box tube wall of replying to the topic bottle up pore, meniscus stops to descend.Most advanced and sophisticated drop is removed by wall, shift out pipette or pipette, insert and accept in the vessel.

4, emit solution

Choose suitable air admission hole again, pinching elasticity pipe box (or pushing aside) makes under the flow of solution.If blowpipe can directly be depressed suction air with forefinger, solution has been blown.

If wish to operate conveniently, can add fingerboard (6) especially on the pipe box.

The utility model pipette, pipette, following advantage is arranged:

1, for capacity below 5 milliliters, can operate with a hand, left hand can vacate and do other back works.

2, the suitable for reading sealing of pipe, solution does not contact with the operator, and is safe in utilization.

3, owing to be provided with pore, so can be at pipe port fixed in position suction air, as long as design the capacity of suction air, the meniscus that can make solution with the inspiratory capacity after shriveling and decontroling fully below the above pore of the scale of pipette, pipette, just can not draw excessive, not only accurately, but also inhale soon.

4, the speed of emitting solution is easy to control, and is less demanding to operator's individual skill and experience.

Needn't fill in cotton when 5, aseptic condition uses down.For the pipette below 5 milliliters, pipette, one hand can be operated in sterile board, satisfies quick under aseptic condition, quick, requirement accurately.

6, owing to be that additional pore, suction air and the spring-backed quill made forms on original pipette, pipette basis, so can utilize existing equipment production, cost increases few, estimates that each cost below 5 milliliters only increases about one jiao.

Description of drawings:

Fig. 1 is a pipette.Fig. 2 is a pipette.Fig. 3 is band fingerboard pipe box.

Wherein: 1---the pipette pipe shaft, 2---the pipette pipe shaft, 3---pore,

4---the elasticity pipe box, 5---suction air, 6---fingerboard.

Embodiment, as Fig. 2.Get 5 milliliters of pipettes (2) of a present domestic production, on the same plane of tube wall of pipe afterbody, open three pores (3) that diameter is respectively 0.3mm, 0.2mm and 0.1mm, and to put a length be the suitable sebific duct (4) of 1.5cm and degree of tightness, and sebific duct (4) lower edge can just bottle up pore (3).Set up the box aspirator of a plastic accordion (5) at the afterbody port of pipe, after its size just made it to shrivel fully, relieving can be drawn onto the meniscus of solution more than the scale, but does not reach pore.This novel pipette uses through reality, and is functional.

Claims

1, the pipette used of a kind of laboratory, by the centre is to expand the transparent material pipe that part, upper and lower be thin narrow neck to constitute [1], it is characterized in that, on the tube wall of a neck afterbody, have the pore [3] that is no less than, put a pipe box [4] of making by elastomeric material again, make its lower edge cover pore [3], and load onto the suction air [5] of volume energy compression at the neck port.

2, the pipette used of a kind of laboratory, constitute (2) by transparent material pipe with scale division, it is characterized in that, have the pore (3) that is no less than on the one afterbody tube wall, put a pipe box (4) of making by elastomeric material again, make its lower edge cover pore (3), and load onto the air-breathing of volume energy compression at the port of pipe.

3, instrument as claimed in claim 1 or 2 is characterized in that, the size of suction air (5) can be drawn onto the meniscus of solution more than the scale for shriveling the back relieving fully, but does not reach pore (3).

4, instrument as claimed in claim 1 or 2 is characterized in that, the pipe box (4) that the lower edge covers pore (3) is connected as a single entity with suction air (5).

5, instrument as claimed in claim 1 or 2 is characterized in that, the quantity of pore (3) is 1-4, and diameter is 0.05-0.5mm, and the diameter of each pore (3) is identical.

6, instrument as claimed in claim 1 or 2 is characterized in that, the quantity of pore (3) is 1-4, and diameter is 0.05-0.5mm, and the diameter of each pore (3) is not all identical.

7, instrument as claimed in claim 1 or 2 is characterized in that, said transparent material is a glass, and elastomeric material is a rubber.

8, instrument as claimed in claim 7 is characterized in that, the length of rubber sleeve is 0.8-3cm.