CN207204136U - A kind of quantitative liquid shifter - Google Patents

Abstract

This patent application discloses a quantitative pipette, which includes a gun tip, a quantitative cylinder and a piston located inside the quantitative cylinder. One end of the quantitative cylinder is a tapered suction port, and the other end of the quantitative cylinder is a circular tube. The side wall of the quantitative cylinder is provided with a pipetting scale, and the side of the piston facing away from the quantitative cylinder is provided with a piston rod that can drive the piston to reciprocate up and down; The withdrawal device includes a withdrawal ring and an operating rod for controlling the movement of the withdrawal ring, and the gun tip is sleeved on the suction port. The utility model is equipped with an exit device on the suction port, and uses the exit ring on the suction port to make the gun point withdraw from the suction port through the control of the operating rod. In this way, the gun point can be withdrawn from the pipette without touching the gun point with the hands. In this way, it will not touch the residual liquid on the tip of the gun, which has a higher safety factor and reduces operating time.

Description

A quantitative pipette

technical field

The utility model relates to the field of biological analysis, in particular to a quantitative pipette, which is especially suitable for pipetting viscous liquids.

Background technique

Quantitative pipettes are widely used in molecular biology experiments and microbiology experiments. These pipettes form different pressures by adjusting the spring or the stretched state of the piston rod to adjust the measurement volume. Pipettes with various ranges can accurately and conveniently measure a predetermined volume of liquid, laying the foundation for the stability and repeatability of the test system. A quantitative pipette as disclosed in Chinese patent CN203764277U includes a pipette body, one end of the pipette body is a tapered suction mouth, and the end of the pipette body away from the suction mouth is round Shaped nozzle, the circular nozzle is covered with a quantitative device, the quantitative device includes a quantitative cylinder detachably connected to the circular nozzle, the quantitative cylinder is provided with a piston, the piston The side away from the pipette body is provided with an operating rod capable of driving the piston to reciprocate up and down, and the end of the operating rod far away from the piston is provided with an operating plate. The quantitative pipette of the utility model is provided with a quantitative device at the circular nozzle of the pipette body, the quantitative device can accurately pipette the required volume of liquid, the pipetting is more accurate, and the quantitative device can be disassembled, which is more convenient. In order to avoid contamination, generally when using a quantitative pipette, the tip of the gun is put on the suction port, and the solution to be measured is sucked through the tip of the gun. When taking it off, the human hand needs to touch the tip of the gun to withdraw the tip from the pipette tube, so that it will inevitably come into contact with the residual liquid on the tip of the gun. If you wear gloves to operate, it will increase the time spent on the test .

Utility model content

The utility model intends to provide a quantitative pipette to solve the problem that the pipette in the prior art cannot quickly remove the tip of the gun.

A quantitative pipette in this scheme comprises a gun tip, a quantitative cylinder and a piston located inside the quantitative cylinder, one end of the quantitative cylinder is a tapered suction port, and the other end of the quantitative cylinder is a circular nozzle, The gun point is sleeved on the suction port, the side wall of the quantitative cylinder is provided with a pipetting scale, and the side of the piston away from the quantitative cylinder is provided with a piston rod that can drive the piston to reciprocate up and down; An exit device for withdrawing the gun tip is provided, and the exit device includes an exit ring and an operating rod for controlling the action of the exit ring, and the exit ring is sleeved on the suction port.

The working principle of the utility model: a quantitative pipette, similar to the structure of the syringe, including a gun tip, a quantitative cylinder and a piston located inside the quantitative cylinder, one end of the quantitative cylinder is a tapered suction port, and the other end is a circular tube The gun tip is sleeved on the suction port, the piston is controlled by the piston rod, and it reciprocates up and down in the metering cylinder, so that the working end of the gun tip generates suction, and the solution to be absorbed is absorbed into the metering cylinder, and passes through the side of the metering cylinder. There is a pipetting scale on the wall, which is used to read the volume of the liquid when pipetting. When the pipetting is completed, the tip of the suction port needs to be pushed out, and the push-out ring is controlled by the operating lever on the withdrawal device, and the tip of the gun is pushed out. Exit from the suction port.

Beneficial effects of the utility model: the present invention is equipped with an exit device on the suction port, and the gun point can be withdrawn from the suction port by using the exit ring on the suction port and controlled by the operating rod. The tip is retracted from the pipette, so that it will not come into contact with the residual liquid on the tip of the pipette, which has a higher safety factor and reduces operating time.

Preferred option 1, the gun point is sleeved on the withdrawal ring, and the withdrawal ring is provided with a shrapnel against the gun point, and the shrapnel is connected to the operating rod for controlling its inward extrusion. One of the implementations of the withdrawal device, through the setting of the shrapnel, the shrapnel is held against the inside of the gun tip when absorbing liquid. When the gun tip needs to be removed, the operating lever is controlled to press the shrapnel inside, so that the shrapnel does not hold against the inside of the gun tip. It can be pushed out from the suction port.

Preferred option 2, the withdrawal ring is slidingly connected to the suction port, and the withdrawal ring is arranged on the suction port at the end away from the gun tip. The withdrawal ring and the gun point are on the same vertical plane and coaxial, and the control lever is downward to move the withdrawal ring downward, and the gun point is pressed downward to escape from the suction port.

As a further optimization of the second preferred option, a protective sleeve is provided outside the metering cylinder located on one side of the circular nozzle, and a sliding groove slidably connected with the operating rod is provided on the protective sleeve. The protective cover is fixed by the limit column provided on the quantitative cylinder, and the operating rod can slide up and down in the sliding groove.

Further optimization of the above optimization scheme: a filter element is provided in the suction port. Large particles of impurities can be filtered out to prevent them from entering the metering cylinder.

Further optimization of the above optimization scheme: the working end of the gun tip is a bevel. Designed for viscous liquids, it can effectively absorb clinical specimens such as glycerol or sputum. The bevel at the working end of the gun tip conforms to the principle of human mechanics, and the user is not easy to fatigue when operating a large amount.

Description of drawings

Fig. 1 is the structural representation of embodiment 1 of a kind of quantitative pipette of the present utility model;

FIG. 2 is a cross-sectional view of FIG. 1 .

Detailed ways

The utility model is described in further detail below by means of specific embodiments:

The reference signs in the drawings of the description include: piston rod 1, protective sleeve 2, operating rod 3, sliding groove 4, limit post 5, pipetting scale 6, quantitative cylinder 7, suction port 8, withdrawal ring 9, gun tip 10 , Slope 11, piston 12 and filter element 13.

Embodiment 1 is basically as shown in accompanying drawings 1-2: a quantitative pipette, comprising a gun tip 10, a quantitative cylinder 7, a piston 12 and a protective cover 2, the working end of the gun tip 10 is a bevel 11, and the quantitative cylinder 7 One end of the pipe is a tapered suction port 8, the other end is a circular nozzle, the suction port 8 is provided with a filter element 13, the side wall of the quantitative cylinder 7 is provided with a pipetting scale 6, and the quantitative cylinder 7 located on the side of the circular nozzle The outside is provided with a protective cover 2, and the protective cover 2 is provided with a sliding groove 4 that is slidably connected with the operating rod 3. The protective cover 2 is fixed by the limit post 5 provided on the quantitative cylinder 7; There is a piston rod 1 that can drive the piston 12 to reciprocate up and down; the suction port 8 is provided with an exit device that withdraws the gun point 10, and the exit device includes an exit ring 9 and an operating rod 3 that controls the action of the exit ring 9. The exit ring 9 is arranged on the The upper part of the gun point 10 is slidingly connected with the withdrawal ring 9 and the suction port 8. The withdrawal ring 9 and the gun point 10 are in the same vertical plane and coaxial. The support is released from the suction port 8.

The difference between embodiment 2 and embodiment 1 is only that the structure and position of the withdrawal device are changed, that is, the gun point 10 is socketed on the withdrawal ring 9, and the withdrawal ring 9 is provided with a shrapnel against the gun point 10, and the shrapnel is connected to control its Joystick 3 squeezed inwards.

What is described above is only an embodiment of the utility model, and the common knowledge such as the specific structure and characteristics known in the scheme is not described too much here, and those of ordinary skill in the art know all the technical fields of the utility model before the filing date or the priority date. ordinary technical knowledge, be able to know all the prior art in this field, and have the ability to apply conventional experimental methods before this date, those of ordinary skill in the art can improve and implement this application in combination with their own abilities under the inspiration given by this application Schemes, some typical known structures or known methods should not be obstacles for those of ordinary skill in the art to implement the present application. It should be pointed out that for those skilled in the art, under the premise of not departing from the structure of the utility model, some deformations and improvements can also be made, and these should also be regarded as the protection scope of the utility model, and these will not affect the utility model. Effects of novel implementations and utility of patents. The scope of protection required by this application shall be based on the content of the claims, and the specific implementation methods and other records in the specification may be used to interpret the content of the claims.

Claims (6)

1. a kind of quantitative liquid shifter, including rifle is sharp, quantitation tube and the piston inside quantitation tube, one end of the quantitation tube are The suction inlet of taper, the other end of the quantitation tube is circular ports, and the rifle point is socketed on suction inlet, the side wall of the quantitation tube Liquid relief scale is provided with, the piston is provided with away from the side of quantitation tube can drive piston to make the piston rod to pump； Characterized in that, the suction inlet is provided with the extractor for exiting rifle point, the extractor includes exiting ring and control is moved back Go out the action bars of gyration work, the ring set that exits is connected on suction inlet.

2. quantitative liquid shifter according to claim 1, it is characterised in that：The rifle point, which is socketed in, to be exited on ring, described to move back Go out ring and be provided with the shell fragment for supporting rifle point, the shell fragment connection controls the action bars that it is inwardly extruded.

3. quantitative liquid shifter according to claim 1, it is characterised in that：The ring that exits is slidably connected with suction inlet, exits Ring is arranged on the suction inlet of rifle point one end.

4. quantitative liquid shifter according to claim 3, it is characterised in that：Set outside the quantitation tube of circular ports side There is protective case, the protective case is provided with the sliding groove being slidably connected with action bars.

5. quantitative liquid shifter according to claim 4, it is characterised in that：Filter core is provided with the suction inlet.

6. quantitative liquid shifter according to claim 5, it is characterised in that：The working end of the rifle point is angle.