Positive-pressure filter membrane device

Abstract

The invention discloses a positive-pressure filter membrane device, relates to the field of experimental equipment for detection, and mainly aims to simplify a filter operation for an extracting solution. The main technical scheme of the invention is that the positive-pressure filter membrane device comprises a positive-pressure device and a filter device. The positive-pressure device comprises aninflator, a piston push rod matched with the inflator, and a seal head, wherein the first end of the inflator is provided with an insertion hole, and the second end of the inflator is provided with an air hole; the piston push rod is inserted into the inflator through the insertion hole, is in fit with the inner wall of the inflator, and can move back and forth in the inflator; the seal head is provided with a through hole penetrating through the first end and the second end thereof, and the first end of the seal head is connected with the air hole and is opposite to the second end of the seal head. The filter device comprises a liquid retainer and a filter head, wherein the liquid retainer is a barrel having openings at both of the first end and the second end; the first end of the liquid retainer is used for connecting the second end of the seal head, and the second end of the liquid retainer is connected with the filter head. The positive-pressure filter membrane device is mainly used for filtering a sample extracting solution.

Description

technical field [0001] The invention relates to the field of testing experimental equipment, in particular to a positive pressure membrane passing device. Background technique [0002] In the analysis of drug residues in professional testing laboratories, when using chromatography and mass spectrometers for analysis and detection, it is often necessary to make the monitored samples into extracts, then purify the extracts through filter membranes, and then carry out relevant analysis and analysis. detection. [0003] However, in the existing technology, the step of filtering the extract using a filter membrane is all done using a disposable syringe. Specifically, a filter membrane is placed on the outlet end of the disposable syringe barrel, and then the extract is filtered. Installed in the barrel of a disposable syringe, and finally press the push rod of the disposable syringe to extract the hydraulic filter membrane to complete the filtration. This kind of filtration meth...

AI Technical Summary

Problems solved by technology

[0003] However, in the prior art, the step of filtering the extract using a filter membrane is all done using a disposable syringe. Specifically, a filter membrane is placed on the liquid outlet end of the disposable syringe barrel, and then the extract is filtered. Installed in the barrel of a disposable syringe, and finally press the push rod of the disposable syringe to extract the hydraulic filter membrane to complete the filtration. This kind of filtration method is very inconvenient during the operation. It is necessary to first connect the push rod of the disposable syringe to the syringe Separation, insert the push rod into the syringe after filling the extraction liquid in the syringe, at this time there is already extraction liquid in the syringe, the extraction liquid will start to be pressed out during the process of inserting the piston core rod into the syringe, at this time not only the pressing force is not It is easy to control, and it is easy to crush the filter membrane due to excessive pressure. It is very troublesome to install the push rod many times especially when processing extracts in batches. Especially when processing extracts of different samples in batches, it is necessary to use each extract. New single-use syringes wear out and cost more

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