33results about How to "Avoid Potential Contamination" patented technology

A surgical instrument includes a detachable tool assembly. The assembly includes a connection rod and a tool, such as a pair of jaws or an electrode. The instrument also includes a shaft operatively connected to a handle movable between operating positions and an ejected position. A tubular housing encloses the shaft and a collet. The collet is attached to the rod and movable between the positions. The fingers of the collet are flared apart in the ejected position but collapse to capture the connection rod in the operating positions. A tongue-and-groove arrangement provides a secondary coupling between the assembly and the housing when the handle is in the operating positions.

The invention relates to a one-pot synthesis method of ceftriaxone sodium. The adopted one-pot synthesis method comprises the following steps: directly adopting an organic solution of 7-ACT as the intermediate 7-ACT is not separated in a solid manner, adding an organic solvent B, an antioxidant and water into the organic solution of the 7-ACT, then, adding AE active ester, performing further reaction under the action of organic base, adding a salt forming agent for salt formation, performing standing, extraction, water phase decolorization and filtering, and adding water-soluble organic solvent C crystal, so as to obtain the ceftriaxone sodium. According to the method for synthesizing the ceftriaxone sodium, the whole-process non-artificial direct contact to materials can be realized, the whole-process whole-solvent flow-state closed operation can be implemented, the control on the interaction effect of personnel and materials during the production process is facilitated, the shortening of the production period is facilitated, the production operation is simplified, the discharge of waste liquid is reduced, the energy consumption during the intermediate drying process is reduced, and the effect of reducing the cost to a certain degree is achieved.

The invention belongs to the chemical engineering field, and particularly discloses a method for preparing 3,4-dichloro bromobenzene. The method comprises steps of adding reduced iron powder into the raw material o-dichlorobenzene, inletting bromine water under certain pressure and temperature, and carrying out bromination reaction in a bromination kettle; carrying out multistage crystallization on the crude bromized 3,4-dichloro bromobenzene through solution, so as to purify the 3,4-dichloro bromobenzene, wherein the crude bromized 3,4-dichloro bromobenzene is crystallized by at least one stage, generally by multiple stages, namely, from one stage to three stages, so that a complete cycle of crystallization and purification of the 3,4-dichloro bromobenzene product is formed. The method has the main beneficial effects that the product is not polluted by foreign solvents or other materials, for the byproduct 2,3- dichloro bromobenzene generated in preparation of 3,4-dichloro bromobenzene through o-dichlorobenzene is used as the solvent; particularly, reduction of the yield of 3,4-dichloro bromobenzene caused by intensified side reaction of the 2,3- dichloro bromobenzene due to rectification high temperature is avoided; the method has the characteristics of high yield of the product, high purity and high production efficiency.

The invention discloses an extraction process of dihydromyricetin in ampelopsis grossedentata and a preparation process of an ampelopsis grossedentata functional beverage. The extraction method comprises the steps of pretreatment, countercurrent extraction treatment, pretreatment of filter residues, extraction and combination of the filter residues, vacuum concentration of flavonoid extracts, crystallization and the like. According to the extraction method, the raw materials can be extracted sufficiently, the residual flavonoid substances in the filter residues can be extracted more thoroughly, efficient extraction of the flavonoid substances is guaranteed, the extraction rate is high, and the flavonoid content is high. Meanwhile, the extraction method adopts a method of combining water extraction, ultrasonic extraction and high-pressure extraction, so that potential pollution caused by use of organic solvents such as ethanol is avoided. The method has the advantages of high dihydromyricetin extraction rate and high dihydromyricetin content.

The invention discloses a protein-free culture medium for culturing microencapsulated recombinant Chinese hamster ovary (CHO) cells and a preparation method thereof. By using DMEM (dulbecco's modified eagle medium)/F12 as a basal culture medium, micromolecule substance iron salt with definite component, zinc salt, sodium selenite, sodium acetate, glutamine and glucose are added according to the characteristics of the microencapsulated cell culture. The culture medium does not influence the stability of the microcapsules, does not have insulin or transferrin in the traditional serum-free culture medium, and lowers the downstream technique and cost; and the product expression level is approximate to the culture level of the expensive specific culture medium, but the price is only one-tenth of the expensive specific culture medium. Thus, the protein-free culture medium can be used for microencapsulated recombinant CHO cells culture and protein expression, and greatly lowers the culture cost.

The invention relates to a chemical laboratory waste incineration treatment system. The chemical laboratory waste incineration treatment system comprises a cleaning system, a rotary incineration system, a waste heat utilization system and a flue gas treatment system. According to the chemical laboratory waste incineration treatment system, not only can chemical laboratory waste be treated, but also generated wastewater can be cyclically treated, comprehensive treatment on the chemical laboratory waste is achieved, flue gas generated by incineration can be treated, generation of secondary pollution is prevented, and a good application prospect is achieved.

The invention relates to the technical field of food detection, and discloses detection equipment for fish fillets containing bones. The detection equipment comprises a conveyor, and an X-ray detection device arranged on the conveyor, wherein the conveyor is used for carrying and moving a plurality of fish fillets, and the X-ray detection device is used for detecting the plurality of fish fillets to find out the fish fillets containing bones, and displaying a detection result. The invention also disclosed a detection method for the fish fillets containing bones. By using the X-ray detection device, the detection equipment provided by the invention realizes real-time detection of a plurality of fish fillets in each big area on a conveyor belt; and the detection equipment is simple in structure, and can obviously reduce the labor cost and have a good using effect.

The invention provides a remote sensor damping and vibration-isolation device improved based on a bi-pod supporting mode, and relates to the technical field of optical remote sensing vibration isolation. The remote sensor damping and vibration-isolation device comprises lower adapting supports, vibration isolation metal outer rods, vibration isolation metal inner rods and an upper adapting support, wherein the lower adapting supports are located in the same plane and horizontally fixed at the lower end of the remote sensor damping and vibration-isolation device; one end of each vibration isolation metal outer rod is fixedly connected with the corresponding lower adapting support, and the vibration isolation metal inner rods are fixedly mounted in the vibration isolation metal outer rods and extend out of the upper end faces, in the axial direction, of the vibration isolation metal outer rods; the ends, extending out of the vibration isolation metal outer rods, of the vibration isolation metal inner rods are fixedly connected; and the upper adapting support is fixedly mounted at the joint of the vibration isolation metal inner rods. The remote sensor damping and vibration-isolation device is high in vibration reduction efficiency and few in consumed system resource, functional separation of a rigid supporting structure and a damping and vibration reduction structure is achieved, the technical problem that the rigidity of a vibration isolation system is hard to maintain effectively is solved, and the temperature maintaining purpose of a working section of the damping and vibration isolation system is achieved.

The invention discloses a sorting mechanism capable of distinguishing the grades of tea fresh leaves. The sorting mechanism comprises a sorting box and a feed mechanism; the sorting box is arranged onone side of the feed mechanism and comprises a box body rack, a vibrating feeding mechanism, a first sorting mechanism, a second sorting mechanism, a signal processor and a sensing device; the firstsorting mechanism comprises an infrared spectrum scanning device; the infrared spectrum scanning device is arranged below a first sliding chute; the light projection direction of the infrared spectrumscanning device is perpendicular to the sliding rail of the first sliding chute; an air compressor and an air-jet device are arranged below the infrared spectrum scanning device; the air-jet device communicates with the air compressor; and the air-jet device and the infrared spectrum scanning device are electrically connected with the sensing device. According to the existing near infrared spectrum special waveband of the fresh leaves, the tea fresh leaves with high grade are screened out first, then, a neural network is adopted to further analyze, screen and distinguish, and the sorting mechanism is fast, precise and effective in screening.

A “mini-severing and back-off” tool includes a tubular magazine for a column of explosive pellets that are sized in diameter to provide a predetermined weight of explosive per unit column length. The tubular wall is vented at prescribed intervals for fluid pressure equalization between the internal bore of the tubular and the fluid pressure around the outside of the tubular. A fluid barrier is positioned between one end of the explosive pellet tubular and a detonator or an explosive booster provided to detonate the explosive pellet tubular. The explosive pellet tubular is positioned within the flow bore of a pipe string and adjacent to an intended pipe joint, and the explosive pellet tubular is detonated simultaneously with an application of torque on the pipe string, wherein the torque is applied in the thread release direction to disassemble the intended pipe joint.

The invention relates to a partition board composition raw material based on desulfurized gypsum and a preparation method, the partition board composition raw material comprises dry desulfurized gypsum as a main material I, fly ash as a main material II and a reinforcing auxiliary material as a main material III, through the dry desulfurized gypsum and the fly ash, raw material setting of the partition board is realized, and through the reinforcing auxiliary material, the partition board is prepared. The partition board is reinforced, so that consumption treatment of the desulfurized gypsum is realized, and the environment is protected.