13 results about "Syringe filter" patented technology

The utility model discloses an injection type sample filtering device which comprises a fixed seat, a needle cylinder type filter, an injector and a driving part, a first platform and a second platform are arranged on the fixed seat from bottom to top, and the first platform is used for placing a sample collecting container; the needle cylinder type filter is arranged on the second platform; a liquid inlet is formed in the top of the needle cylinder type filter, and a liquid outlet is formed in the bottom; the injector is arranged on the fixed seat and is positioned above the second platform; an outlet of the injector is in butt joint with the liquid inlet; the driving part is arranged on the fixed seat; the driving part is connected with a push rod of the injector and used for vertically pushing the push rod. The syringe and the needle cylinder type filter are fixed, and the push rod is pushed by the driving part with fixed thrust, so that the stability of filtering operation is improved, automatic filtering is realized, manual operation is replaced, and the working efficiency is improved.

The utility model discloses a quick mounting tool for a filter membrane of an injector. The quick mounting tool comprises a base, a lower die and an upper die, first limiting grooves are formed in the opposite inner sides of the first lower module and the first upper module, a plurality of second limiting grooves are formed in the opposite inner sides of the second lower module and the second upper module, the number of the first limiting grooves is the same as that of the first limiting grooves, and the second limiting grooves and the first limiting grooves are in one-to-one correspondence; one end of the lower die is rotationally connected with one end of the upper die; the upper die block I and the upper die block II are fixedly connected together through a connecting plate; a push plate is connected to the connecting plate in a sliding mode, a first groove matched with a lug plate on an injector tube body is formed in the lower end of the push plate, a pull plate is connected to the connecting plate in a sliding mode, and a second groove matched with a pressing plate on an injector rod body is formed in the lower end of the pull plate. According to the utility model, a plurality of piston rods can be pulled out at one time by pulling the pull plate after the syringe filter membranes and the syringes are placed on the lower die and the upper die is closed, and a plurality of syringe filter membranes can be mounted at the same time by pushing the push plate, so that the operation is simple and convenient, and time and labor are saved.

The utility model discloses a needle type filter which comprises an upper cover plate, a lower cover plate, a filter membrane, a connecting assembly and a protection assembly, the connecting assembly is arranged at the bottom of the lower cover plate, and the protection assembly is arranged on the outer surface of the upper cover plate; the connecting assembly comprises a connecting frame fixedly installed at the bottom of the lower cover plate, connecting grooves are formed in the two sides of the connecting frame, connecting plates are rotationally installed in the connecting grooves, first arc-shaped clamping plates are fixedly installed on one sides of the connecting plates, torsional springs are fixedly installed between the connecting plates and the connecting frame, and pressing plates are fixedly installed at the tops of the connecting plates. According to the needle type filter disclosed by the utility model, a plurality of needle type filters can be connected while the needle type filters can be quickly matched on a partition plate or a socket of automatic equipment by a worker through the arranged connecting assembly, so that the use efficiency of the needle type filters is improved, and the filtering effect of the needle type filters is improved; and the second arc-shaped clamping plate can be quickly clamped with the first arc-shaped clamping plate, so that the connection efficiency of the needle type filter is improved.

The invention relates to a filtration unit, in particular a syringe attachment filter or syringe filter holder, for filtering of a fluid, the filtration unit comprising: a first housing part comprising at least one first fluid chamber for a fluid to be filtered; a second housing part comprising at least one second fluid chamber for a filtered fluid; a filter element configured to fluidly connect the first chamber and the second chamber and to filter the fluid to be filtered; wherein the second housing part comprises: a support surface for supporting a fringe area of the filter element; and a rib element protruding from the support surface, at least a distal portion of the rib element consisting of or comprising a material substantially fusible by welding; wherein the first housing part comprises: an abutting surface for substantially abutting with the distal portion of the rib element, the abutting surface at least partly facing the support surface of the second housing part; and a barrier element protruding from the abutting surface towards the support surface and positioned relative to the rib element so as to laterally enclose an inner melt cavity therebetween, wherein the inner melt cavity upon welding is at least partially filled with solidified melt originating from fused material of the distal portion of the rib element, wherein the first housing part and the filter element and, optionally, the second housing part are to be coupled to one another via the solidified melt in the inner melt cavity.

The invention discloses a method for synchronously detecting water-soluble vitamins in a compound feed based on HPLC (High Performance Liquid Chromatography) and application, and belongs to the technical field of vitamin detection. The detection method specifically comprises the following steps: uniformly mixing a to-be-detected compound feed, a standard substance and an extracting solution, performing ultrasonic treatment for 30 minutes, and passing through a 0.45 mu m needle type filter to obtain a to-be-detected solution of three vitamins and a standard substance at the same time; respectively detecting the to-be-detected solution and the standard solution by adopting a high performance liquid chromatography, and calculating the content of the water-soluble vitamins in the to-be-detected feed by using an external standard method according to an obtained high performance liquid chromatogram. According to the method, rapid separation and accurate quantification of vitamin B1, vitamin B2 and vitamin B6 are realized by optimizing chromatographic conditions and a pretreatment process. The method has the advantages of wide applicability, obviously reduced cost, high throughput and compatibility, strong specificity, high sensitivity, and safe and environment-friendly operation.

The present invention discloses a titanium-based solid-phase filler, a titanium-based syringe filter containing the same, and applications thereof. The present invention utilizes the titanium-based solid-phase filler as a functional filler, filling it into a specially prepared titanium-based syringe filter for further selective processing of DOM samples pre-enriched by SPE. This design serves as a secondary selective purification step in the analytical process, efficiently removing background components of easily ionized carboxylic acids and phenolic oxygen-containing organic compounds, reducing mass spectrometry baseline noise, and significantly improving the detection sensitivity and quantitative reliability of soluble organic nitrogen compounds.

The application relates to an antibacterial adhesive material and application thereof, relates to the technical field of adhesive materials, and solves the problem that the existing adhesive material is not good in function in a wet state environment. The coagulum formed after mixing cationic hydrochloride and anionic small-molecule sodium thioctic acid salt in a buffer solution and centrifugation is prepared through dehydration and solidification; the sodium thioctic acid salt is obtained through the following steps: dissolving sodium hydroxide in deionized water, adding alpha-thioctic acid into the solution in batches under intense stirring, filtering the obtained mixture with a polytetrafluoroethylene syringe filter, and freeze-drying; the cationic hydrochloride is polylysine hydrochloride, polyhexamethylene biguanide hydrochloride or branched polyethyleneimine hydrochloride. The application can be applied to medical antibacterial dressings, tissue adhesives or cultural relic restoration, and the adhesion is activated by physiological saline, a buffer solution or water before use.

The utility model relates to needle cylinder filter technical field, and disclose a kind of anti-toppling rest rack of needle cylinder filter, including frame base: the top of frame base is equipped with fixed frame, the front end of fixed frame is equipped with multiple placing plate, the top of placing plate is equipped with limit cover, the top of placing plate is equipped with several placing grooves, the bottom of limit cover is equipped with several cooperation grooves used in cooperation with placing groove, the both sides of limit cover are fixedly connected with clamping sleeve, the both sides of placing plate are equipped with pressing groove, and the inside of pressing groove is fixedly connected with elastic spring.The anti-toppling rest rack of needle cylinder filter, by installing the limit cover that can be conveniently removed fixed on the surface of placing plate, when needle cylinder filter is stored and placed, it can have stable limiting effect, so that it will not be caused by external collision and cause the toppling of needle cylinder filter, and effectively improve the stability in the process of needle cylinder filter placement.

The present invention discloses a method and application for synchronous detection of water-soluble vitamins in compound feed based on HPLC, which belongs to the technical field of vitamin detection. The detection method of the present invention specifically comprises the following steps: respectively mixing the compound feed to be tested, a standard product and an extract, ultrasonically treating for 30 min, passing through a 0.45 μm syringe filter, and simultaneously obtaining a test solution and a standard product of three vitamins; respectively detecting the test solution and the standard solution by high performance liquid chromatography, and calculating the content of the water-soluble vitamins in the test feed by an external standard method based on the obtained high performance liquid chromatography spectrum. This method realizes the rapid separation and accurate quantification of vitamin B1, vitamin B2 and vitamin B6 by optimizing the chromatographic conditions and pre-treatment process. This method has wide applicability, significantly reduces cost, and has the advantages of high throughput and compatibility, strong specificity, high sensitivity, safe and environmentally friendly operation.

The utility model discloses a small dose filtration syringe which comprises a needle cylinder, a replacement head and a pressurization assembly, a push rod is arranged in the needle cylinder, and a piston is arranged at the front end of the push rod; an external thread is arranged at the front end of the outer surface of the needle cylinder; the replacing head comprises a sleeve, and an internal thread connected with the external thread in a matched mode is arranged in the sleeve. A filter membrane is fixedly arranged at the front end of the sleeve; the pressurizing assembly is detachably arranged at the rear end of the needle cylinder. The spiral structure is additionally arranged between the front-end empty cylinder and the middle-rear-end empty cylinder of the injector, the water system membrane or the organic system membrane is assembled with the front-end empty cylinder of the injector, breakage and liquid leakage of the joint of a filter head of a traditional injector when the buffer pressure is too large are avoided, meanwhile, only the filter membrane needs to be replaced when different buffers are filtered, and the filter head is convenient to replace. And more materials and time are saved. In addition, a pressurizing assembly is further introduced, so that the operation is more labor-saving and faster.

This invention relates to the field of medical device manufacturing technology and discloses an ultrasonic welding device for syringe filter needle hubs. The device includes a welding bracket, a feeding box, a feeding mechanism, and a welding auxiliary mechanism. The feeding mechanism includes a feeding auxiliary seat and a rotating seat. The feeding auxiliary seat is fixedly installed on the bottom inner wall of the feeding box, and the rotating seat is rotatably installed inside the feeding auxiliary seat. The welding auxiliary mechanism includes a base body, two welding auxiliary cylinders, and a welding auxiliary plate. The base body is located on top of a base, and the welding auxiliary cylinders and welding auxiliary plate are both located inside the base body. This invention, through the feeding mechanism, allows the needle hubs to be welded to be arranged one by one, facilitating the welding process. The welding auxiliary mechanism enables automatic welding and unloading, avoiding the need for manual placement of each needle hub at the workstation, which results in low welding efficiency and eliminates the safety hazards associated with manual feeding.

The present invention relates to a method for purifying injectable radiolabeled macroaggregated human serum albumin (MAA) in a solution using a syringe filter, wherein the syringe filter used has the property of capturing and releasing the radiolabeled MAA while not retaining impurities from the bulk solution.

Various implementations include approaches and systems for isolating acellular biological therapeutics. In a particular implementation, a method includes: drawing leukocyte- and platelet-rich plasma (L-PRP) into a first syringe, passing the L-PRP from the first syringe through a syringe filter to provide filtered L-PRP, drawing the filtered L-PRP into a second syringe, the second syringe having at least one protein precipitating agent (PPA) to provide a L-PRP / PPA mixture, performing a phase separation of protein precipitate and liquid phase from the L-PRP / PPA mixture, removing the liquid phase to yield a concentrated protein precipitate, passing the concentrated protein precipitate and water through a filtering tube, the filtering tube isolating concentrated protein from the concentrated protein precipitate and water, and collecting the concentrated protein.