CN220759296U - Anti-sputtering DNA extraction gun head - Google Patents

Abstract

The utility model discloses a splash-proof DNA extraction gun head, which relates to the technical field of DNA extraction gun heads and comprises an extraction gun body, a gun body connecting pipe, an extraction gun head and a liquid suction unit, wherein the gun body connecting pipe is arranged below the extraction gun body, the gun body connecting pipe comprises a ventilation section connected with the lower end part of the extraction gun body, and a connecting section is arranged below the ventilation section; the extraction gun head comprises a gun head connecting pipe sleeved below a gun body connecting pipe through a connecting section, and the extraction gun head and the liquid suction unit are arranged.

Description

Anti-sputtering DNA extraction gun head

Technical Field

The utility model belongs to the technical field of DNA extraction gun heads, and particularly relates to an anti-sputtering DNA extraction gun head.

Background

In recent years, with the continuous development of molecular biology technology, especially the wide application of PCR technology and high throughput sequencing technology, the gene detection technology gradually goes from laboratory to clinical application, wherein, blood is the main DNA source of the relevant research of human genotype, as sample material in clinical and scientific research work, it is more and more widely used in experiments such as carrying out gene detection, gene polymorphism analysis, need use DNA to draw the rifle head and draw DNA extract reagent when detecting the gene, traditional extraction rifle head is connected with extraction rifle body through its rifle head supervisor, and adopt negative pressure imbibition, and the suction inlet of extraction rifle head is less, if the pressure is too big during the extraction can lead to liquid to rise upwards in extraction rifle head rapidly, pollute the extraction rifle cover handle, can cause the pollution to next pipette, the authorized announcement number is CN212040507U, it is the sample material of pipette rifle to have been disclosed, through setting up the anti-flow valve piece in the rifle head and avoid the extract to splash in the pipette gun, the pollution of liquid to the pipette gun, though adopting the anti-flow valve piece can stop extracting liquid to spray liquid to the extracting body directly, the suction inlet is less, the condition of high pressure can not be easily discharged when the pressure is difficult to appear when the extraction is discharged when the pressure is too big during the extraction is discharged, the high pressure is difficult to appear when the high-speed is discharged when the extraction is difficult to take place.

Disclosure of Invention

Aiming at the problems existing in the prior art, the utility model provides an anti-sputtering DNA extraction gun head, which can prevent the extraction gun head from splashing during liquid suction and liquid discharge and ensure that the extraction gun head can stably suck or discharge liquid.

The utility model solves the technical problems by adopting the scheme that: the anti-sputtering DNA extraction gun head comprises an extraction gun body, a gun body connecting pipe, an extraction gun head and a liquid suction unit, wherein the gun body connecting pipe is arranged below the extraction gun body, the gun body connecting pipe comprises a ventilation section connected with the lower end part of the extraction gun body, and a connecting section is arranged below the ventilation section; the extraction gun head comprises a gun head connecting pipe sleeved below the gun body connecting pipe through a connecting section, the inner diameter of the gun head connecting pipe is consistent with the inner diameter of the ventilation section, a suction pipe is arranged at the lower end part of the gun head connecting pipe, and a suction head is arranged at the lower end part of the suction pipe; the liquid suction unit comprises a lower piston which is matched and sleeved in the suction pipe, an upper piston is connected above the lower piston through a telescopic piece, the upper piston is matched and sleeved in a channel formed by a gun head connecting pipe and a ventilation section, a buffer cavity is formed between the upper piston and the lower piston, an elastic buffer piece is sleeved between the upper piston and the lower piston, and a liquid suction cavity is formed between the lower side part of the lower piston and the inner wall of the suction pipe.

Further, the telescopic piece is a telescopic rod.

Further, the elastic buffer piece is a spring, the spring is sleeved on the telescopic rod, and the upper end and the lower end of the spring are respectively connected with the side parts of the upper piston and the lower piston.

Further, a sealing ring pad is arranged at the joint of the connecting section of the gun body connecting pipe and the ventilation section in a matching way.

Further, an annular flange for preventing the upper piston from slipping from the gun head connecting pipe is arranged at the joint of the gun head connecting pipe and the suction pipe.

Compared with the prior art, the utility model has the beneficial effects that:

according to the utility model, the extraction gun head and the liquid suction unit are arranged, when the extraction gun head is used for sucking DNA extracting liquid, the negative pressure generated by the extraction gun body sucks the upper piston to directly move upwards, meanwhile, the elastic buffer piece is pulled to stretch, under the cooperation of the elastic buffer piece, the lower piston can be reduced to receive the tensile force of the upper piston, so that the lower piston stably moves upwards under the cooperation of the negative pressure suction of the extraction gun body and the elastic force of the elastic buffer piece to suck liquid, the excessive suction is avoided, the DNA extracting liquid directly splashes upwards, the lower piston can block the upper part of the suction pipe, the DNA extracting liquid is prevented from entering the extraction gun body, the upper piston is pushed to move downwards through the extraction gun body during liquid transferring, the elastic buffer piece firstly compresses the elastic buffer piece, then under the cooperation of the elastic force of the elastic buffer piece and the negative pressure pushing action, the lower piston can be stably moved downwards, the DNA extracting liquid in the liquid suction cavity is stably pushed out to perform liquid transferring, the splash phenomenon can be avoided when the reagent is discharged, and the stability of the NDA extracting liquid is ensured.

Drawings

FIG. 1 is a schematic elevational cross-sectional view of the present utility model;

FIG. 2 is an enlarged partial cross-sectional schematic view of the present utility model;

FIG. 3 is a schematic diagram of a front cross-sectional structure of a gun body adapter of the present utility model;

fig. 4 is a schematic perspective view of the present utility model.

In the figure: 1. extracting a gun body; 2. a gun body connecting pipe; 21. a connection section; 22. a ventilation section; 23. a seal ring pad; 3. extracting a gun head; 31. a suction pipe; 32. a suction head; 33. a gun head connecting pipe; 4. a liquid suction unit; 41. a lower piston; 42. an upper piston; 43. a telescoping member; 44. an elastic buffer member; 45. an annular flange; 46. a buffer chamber; 47. a liquid suction cavity.

Detailed Description

The utility model will be further described with reference to the drawings and examples.

Referring to fig. 1-4, the utility model provides a technical scheme of a sputter-proof DNA extraction gun head:

examples

According to the figures 1 and 4, the extracting gun body 1 and the gun body connecting tube 2 are connected up and down, the gun body connecting tube 2 is composed of a ventilation section 22 and a connecting section 21 which are arranged up and down, the ventilation section 22 is directly connected to the lower end part of the extracting gun body 1, a sealing ring pad 23 is matched and arranged at the joint of the connecting section 21 and the ventilation section 22 of the gun body connecting tube 2, an extracting gun head 3 is sleeved below the gun body connecting tube 2, the extracting gun head 3 is composed of a gun head connecting tube 33, a suction tube 31 and a suction head 32 from top to bottom, external threads are arranged on the outer side wall of the gun head connecting tube 33 in the circumferential direction, as shown in figure 3, internal threads are arranged on the inner side wall of the connecting section 21 of the gun body connecting tube 2, the gun head connecting tube 33 is sleeved below the gun body connecting tube 2 through the threads of the connecting section 21, when the extracting gun head 3 is installed on the extracting gun body 1, the gun head connecting tube 33 is only required to be aligned with the connecting section 21 of the gun body 2, and the gun head connecting tube 33 is screwed forward, the extracting gun head 3 can be connected to the extracting gun body 1, if the extracting gun head 3 needs to be taken down, the extracting gun head 3 can be taken down from the extracting gun body 1 by reverse screwing, the dismounting mode of the extracting gun head 3 is more convenient, the upper end part of the gun head connecting pipe 33 is propped against the lower part of the sealing ring pad 23, the connecting effect between the gun head connecting pipe 33 and the gun body connecting pipe 2 can be enhanced through the sealing ring pad 23, the sealing connection is realized, the inner diameter of the gun head connecting pipe 33 is consistent with the inner diameter of the ventilation section 22, a communicating channel is formed between the gun head connecting pipe 33 and the ventilation section 22, as shown in figure 2, a liquid absorbing unit 4 for absorbing DNA extracting liquid is arranged in the extracting gun head 3, an upper piston 42 is matched in the channel formed between the gun head connecting pipe 33 and the ventilation section 22, when a negative pressure pump in the extracting gun body 1 operates for sucking air, the upper piston 42 can be driven by negative pressure to move upwards along the channel, an annular flange 45 is arranged at the joint of the gun head connecting pipe 33 and the suction pipe 31, the annular flange 45 can prevent the upper piston 42 from sliding off from the gun head connecting pipe 33 when moving to the lowest part of the gun head connecting pipe 33, a lower piston 41 is sleeved in the suction pipe 31 in a matching way, the lower piston 41 is stably positioned in the suction pipe 31 through friction force with the inner wall of the suction pipe 31, a liquid suction cavity 47 for sucking temporary DNA extracting solution is formed between the lower side part of the lower piston 41 and the inner wall of the suction pipe 31, a buffer cavity 46 is formed between the upper piston 42 and the lower piston 41, the upper piston 42 and the lower piston 41 are connected through a telescopic piece 43, the telescopic piece 43 is a telescopic rod, the upper end part and the lower end part of the telescopic rod are respectively connected with the upper piston 42 and the lower piston 41, when the upper piston 42 is upwards moved by negative pressure suction, the upper piston 42 can drive the lower piston 41 to upwards move through the telescopic piece 43, the lower piston 41 upwards moves to reduce the pressure intensity of the liquid suction cavity 47, the DNA extracting solution enters the suction pipe 31 through the suction head 32 and is temporarily stored in the liquid suction cavity 47 under the action of pressure, an elastic buffer piece 44 is sleeved between the upper piston 42 and the lower piston 41, the elastic buffer piece 44 can be a spring, the spring is sleeved on a telescopic rod, the upper end and the lower end of the spring are respectively connected with the side parts of the upper piston 42 and the lower piston 41, a buffer space can be formed between the upper piston 42 and the lower piston 41 through the elastic buffer piece 44, when the negative pressure suction force of the extracting gun body 1 is overlarge, the upper piston 42 is directly sucked and moved upwards, the spring is pulled and stretched, the lower piston 41 can be reduced to be pulled and pulled upwards under the cooperation of the spring, the lower piston 41 can smoothly move upwards to suck liquid under the cooperation of the negative pressure suction force of the extracting gun body 1 and the elastic force of the spring, the overlarge suction force is avoided, the DNA extracting solution is directly splashed upwards, and the lower piston 41 can block the upper part of the suction pipe 31, so that DNA extracting solution can be prevented from entering the extracting gun body 1, during pipetting, the negative pressure pump in the extracting gun body 1 is controlled to exhaust, the upper piston 42 is directly pushed to move downwards by gas, the lower piston 41 firstly compresses a spring, the pressure born by the lower piston 41 is reduced by the spring, then the lower piston 41 is enabled to move downwards steadily under the action of the elasticity and the negative pressure of the spring, the DNA extracting solution in the liquid suction cavity 47 is pushed out steadily to perform pipetting, and powerful injection of the DNA extracting solution during pipetting is avoided.

In particular use, when the DNA extracting solution is extracted for pipetting, firstly, the extracting gun head 3 is arranged on the extracting gun body 1 through the gun body connecting pipe 2 and the gun head connecting pipe 33, then negative pressure is generated through the extracting gun body 1, the upper piston 42 is directly sucked upwards to move, meanwhile, the spring is pulled to stretch, the lower piston 41 is reduced to receive the pulling force of the upper piston 42 under the cooperation of the spring, the lower piston 41 is smoothly moved upwards to absorb the liquid under the cooperation of the negative pressure suction of the extracting gun body 1 and the elastic force of the spring, the DNA extracting solution is sucked into the liquid absorbing cavity 47 for temporary storage, the upper piston 42 is pushed to move downwards through the extracting gun body 1 during pipetting, the spring is firstly compressed by the upper piston 42, the pressure received by the lower piston 41 is reduced through the spring, then the lower piston 41 is smoothly moved downwards under the action of the elastic force and the negative pressure pushing of the spring, and the DNA extracting solution in the liquid absorbing cavity 47 is smoothly pushed out for pipetting.

The foregoing description of the preferred embodiments of the utility model is not intended to limit the utility model to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model.

Claims (5)

1. The utility model provides a prevent sputter DNA draws rifle head, includes extraction rifle body, its characterized in that: the device comprises a gun body connecting pipe, an extraction gun head and a liquid suction unit, wherein the gun body connecting pipe is arranged below the extraction gun body and comprises a ventilation section connected with the lower end part of the extraction gun body, and a connecting section is arranged below the ventilation section; the extraction gun head comprises a gun head connecting pipe sleeved below the gun body connecting pipe through a connecting section, the inner diameter of the gun head connecting pipe is consistent with the inner diameter of the ventilation section, a suction pipe is arranged at the lower end part of the gun head connecting pipe, and a suction head is arranged at the lower end part of the suction pipe; the liquid suction unit comprises a lower piston which is matched and sleeved in the suction pipe, an upper piston is connected above the lower piston through a telescopic piece, the upper piston is matched and sleeved in a channel formed by a gun head connecting pipe and a ventilation section, a buffer cavity is formed between the upper piston and the lower piston, an elastic buffer piece is sleeved between the upper piston and the lower piston, and a liquid suction cavity is formed between the lower side part of the lower piston and the inner wall of the suction pipe.

2. The sputter-preventing DNA extraction gun head according to claim 1, wherein: the telescopic piece is a telescopic rod.

3. The sputter-preventing DNA extraction gun head according to claim 2, characterized in that: the elastic buffer piece is a spring, the spring is sleeved on the telescopic rod, and the upper end and the lower end of the spring are respectively connected with the side parts of the upper piston and the lower piston.

4. The sputter-preventing DNA extraction gun head according to claim 1, wherein: and a sealing ring pad is matched and arranged at the joint of the connecting section of the gun body connecting pipe and the ventilation section.

5. The sputter-preventing DNA extraction gun head according to claim 1, wherein: the joint of the gun head connecting pipe and the suction pipe is provided with an annular flange for preventing the upper piston from slipping from the gun head connecting pipe.