648 results about "Magnetic response" patented technology

A method of turning a medical device, having a magnetically responsive element associated with its distal end, at an operating point within an operating region inside a patient's body from an initial direction to a desired final direction, through the movement of at least one external source magnet. The at least one external source magnet is moved in such a way as to change the direction of the distal end of the magnetic medical device from the initial direction to the desired final direction without substantial deviation from the plane containing the initial direction and the desired final direction.

A medical device includes a first housing portion (FHP) and a second housing portion (SHP) configured to be to be movable relative to each other from a first position to operatively engage at a second position to couple at least one of a drive device and a needle-inserting device supported by one of the FHP and the SHP to a reservoir supported by the other of the FHP and the SHP. Electronic circuitry configured to detect at least one of a first magnetic interaction between a magnet and at least one of a first magnetically attractive material and a first magnet-responsive device and a second magnetic interaction between the magnet and at least one of a second magnetically attractive material and a second magnet-responsive device, and to provide a signal or a change in state in response to detecting at least one of the interactions.

An un-manned airborne vehicle (UAV), for acquiring aeromagnetic data for geophysical surveying at low altitude on land or over water, comprising an extended fuselage that is adapted to hold and maintain magnetometer and a magnetic compensation magnetometer at a minimum distance from the avionics and propulsion systems of the UAV. The magnetometer measures magnetic anomalies and the magnetic compensation magnetometer measures magnetic responses corresponding to the pitch, yaw and roll of the UAV. A data acquisition system stores and removes the magnetic response measurements from the magnetic anomaly measurements. The data acquisition system also stores a survey flight plan and transmits the same to the avionics system. The generator of the UAV is shielded and the propulsion system is stabilized to reduce magnetic and vibrational noises that can interfere with the operation of the magnetometer.

An apparatus and method for interventional navigation within a subject's body is provided in which a medical device having at least one electrostrictive element is adapted to cause the distal end of the medical device to bend in a given direction for improving navigation. The medical device may further comprise at least one magnetically responsive element on the distal end, which may be oriented in the approximate direction of a magnetic field that is applied to the subjects body. At least one method for navigating a medical device though a subject's body is provided, by changing the direction of an applied magnetic field to align a magnetically responsive element on the distal end for orienting the distal end, and by applying a voltage to at least one electrostrictive element disposed in the distal portion of the device for causing the distal end to change orientation from that achieved by application of the magnetic field alone.

A system and method are provided for attracting a magnetically responsive substance inserted in a subject's body towards a target area within the body to treat the area. The system generally comprises a medical device having a proximal end, a distal end, and at least one magnetic element disposed at the distal end of the medical device for orienting the distal end in a desired direction to place an aperture against the opposite wall of the vessel. The system further includes a voltage that may be applied to a coil that is disposed on the side of the medical device and proximally spaced from the magnetic element. A voltage is applied to the coil to attract the magnetically responsive substances inserted into the body around the coil. A high frequency alternating current voltage is applied to an adjacent transducer to ultrasonically disperse the collected magnetically responsive substances into the surrounding target tissue.

A read head has a flux guide layer that is immediately adjacent (abuts) the back edge of a read sensor. The flux guide layer is made of a high resistance soft magnetic material that conducts magnetic flux from the back edge of the read sensor so that the magnetic response at the back edge of the read sensor is significantly higher than zero. This increases the efficiency of the read sensor. The material for the flux guide layer is A-B-C where A is selected from the group Fe and Co, B is selected from the group Hf, Y, Ta and Zr and C is selected from the group O and N. In a preferred embodiment A-B-C is Fe-Hf-O and the Msrho of the flux guide layer is greater than 50 times the Msrho of the read sensor layer where the read sensor layer is NiFe, Ms is saturation magnetization and rho is resistivity. Because of the flux guides high resistance current shunting losses are nearly eliminated.

The present invention provides an un-manned airborne vehicle (UAV), for acquiring aeromagnetic data for geophysical surveying at low altitude on land or over water, comprising an extended fuselage that is adapted to hold and maintain magnetometer and a magnetic compensation magnetometer at a minimum distance from the avionics and propulsion systems of the UAV. The magnetometer measures magnetic anomalies and the magnetic compensation magnetometer measures magnetic responses corresponding to the pitch, yaw and roll of the UAV. A data acquisition system stores and removes the magnetic response measurements from the magnetic anomaly measurements. The data acquisition system also stores a survey flight plan and transmits the same to the avionics system. The generator of the UAV is shielded and the propulsion system is stabilized to reduce magnetic and vibrational noises that can interfere with the operation of the magnetometer.

An interior rearview mirror system for a vehicle includes an interior rearview mirror assembly, a casing having a reflective element, a compass sensor and a control. The compass sensor is disposed within the mirror casing and has a first magnetoresponsive sensing element and a second magnetoresponsive sensing element. The control receives a first signal indicative of a magnetic field sensed by the first magnetoresponsive sensing element and a second signal indicative of a magnetic field sensed by the second magnetoresponsive sensing element. The control determines that the casing is adjusted by an occupant of the vehicle in response to a change in the first and second signals being indicative of an abrupt movement of the casing about the mounting structure by an occupant of the vehicle. The control is operable to enter a rapid compensating mode to compensate for the mirror adjustment.

The invention discloses a magnetic response type high-efficiency oil-water separation fiber membrane and a preparation method thereof, and belongs to the field of functional micro-nano fiber materials. The magnetic response type high-efficiency oil-water separation fiber membrane disclosed by the invention is prepared by the following steps: dissolving hydrophobic polymers, such as polyvinylidene fluoride, polyurethane or polycaprolactone, as main raw materials into an organic solvent to form a polymer solution; preparing a non-woven fiber membrane material prepared from micro-nano structure fibers by adopting an electrospinning method; forming a sticky polydopamine membrane through polymerization of polydopamine in an alkaline solution, and firmly attaching magnetic nanoparticles onto the surface of an electrospinning fiber membrane by adopting the sticky polydopamine membrane, so as to prepare the magnetic response type high-efficiency oil-water separation fiber membrane. The fiber membrane disclosed by the invention has a super-hydrophobic / super-oleophilic property in air, and has an excellent adsorptive property on a plurality of common oils; the preparation method of the high-efficiency oil-water separation fiber membrane, disclosed by the invention, is simple, low in energy consumption, and high in efficiency,and can be widely applied to the fields such as remote controllable efficient separation of oily wastewater, and the magnetic responsiveness is realized.

The invention discloses a nucleic acid extraction and purification method based on nanometer magnetic beads, comprising the following steps: mixing a biological sample and a lysis buffer to make nanometer magnetic beads in the lysis buffer and nucleic acid DNA / RNA which moves into the lysis buffer form a magnetic bead-nucleic acid compound; transferring the compound under the action of a magnetic field to a washing buffer to wash off impurities on the magnetic bead-nucleic acid compound; and transferring the washed magnetic bead- nucleic acid compound under the action of the magnetic field to an elution buffer so as to elute and recover nucleic acid. The nanometer magnetic beads used in the invention have advantages of uniform size, smooth surface, large surface area ratio, high adsorption capacity of nucleic acid, fast magnetic response speed and rapid separation, and can be stored together with the lysis buffer at room temperature for a long time. The extracted nucleic acid DNA / RNA has high purity, is complete and can be directly used for follow-up detection. The method provided by the invention has shorter nucleic acid extraction time than a general magnetic bead method by the use of a nucleic acid extraction reagent, is more suitable for automation and is adopted to realize high-flux nucleic acid DNA / RNA extraction.

A novel detection or quantifying method for biological entities or molecules such as, but not limited to, DNA, microorganisms and pathogens, proteins and antibodies, that by themselves are target molecules or from which target molecules are extracted, comprises the steps of i) forming target molecule-dependent volume-amplified entities, ii) allowing magnetic nanoparticles to bind to said volume-amplified entities, and iii) measuring changes in dynamic magnetic response of the magnetic nanoparticles caused by the increase in hydrodynamic volume of said magnetic nanoparticles or measuring the magnetic field due to the magnetic nanoparticles as they bind to a sensor surface functionalized with a secondary capturing probe. Biosensors and kits are adapted to be used in such a method.

A variable magnet system for manipulating a magnetic catheter is described. In one embodiment, a cluster of electromagnets is configured to generate a desired magnetic field. In one embodiment, one or more poles of the cluster are moveable with respect to other poles in the cluster to allow shaping of the magnetic field. In one embodiment, one or more magnetic poles can be extended or retracted to shape the magnetic field. In one embodiment, the electromagnets can be positioned to generate magnetic fields that exert a desired torque and / or movement force on the catheter. In one embodiment, the catheter guidance system includes a closed-loop servo feedback system. In one embodiment, a radar system is used to determine the location of the distal end of the catheter inside the body, thus, minimizing or eliminating the use of ionizing radiation such as X-rays. The catheter guidance system can also be used in combination with an X-ray system (or other imaging systems) to provide additional imagery to the operator. The magnetic system used in the magnetic catheter guidance system can also be used to locate the catheter tip to provide location feedback to the operator and the control system. In one embodiment, a magnetic field source is used to create a magnetic field of sufficient strength and orientation to move a magnetically-responsive catheter tip in a desired direction by a desired amount.

The present invention relates to method and device for detecting changes of a magnetic response of at least one magnetic particle in a carrier fluid. The method comprises: using a measuring procedure comprising measuring the characteristic rotation time of said magnetic particle, said measuring procedure further involving measuring Brownian relaxation in said carrier fluid under influence of an external pulsed excitation magnetic field, and based on said influence of said external pulsed excitation magnetic field measuring a hydrodynamic volume of a particle or a change in a hydrodynamic volume of the particle change upon modification of an effective volume of the particle or its interaction with said carrier fluid by detecting change of magnetization of the particle with time by monitoring change of an output signal in detection coil.

The invention belongs to the field of polymer-base heat-conducting composite materials, and relates to a preparation method of a heat-conducting high-polymer composite material, particularly a preparation method of a magnetic micro / nano composite filler / silicon rubber heat-conducting composite material. Magnetic nano metal particles are dispersed and compounded to the micron-sized heat-conducting filler surface to obtain a magnetic composite heat-conducting filler; by using the magnetic response caused by micro / nano compounding, an external magnetic field is utilized to regulate the orientation of the micro / nano composite filler in the silicon rubber base so as to implement orientated arrangement of the composite heat-conducting filler in the silicon rubber base, thereby preparing the heat-conducting anisotropic high-heat-conductivity silicon rubber composite material under the condition of low filling percent of the filler. Besides, the micro / nano composite filler is prepared by coating the magnetic nano metal particles on the heat-conducting filler, thereby avoiding the problems of low dispersion tendency and high aggregation tendency of the nano metal particles in the polymer base, and indirectly implementing uniform dispersion of the micro / nano particles in the polymer base.

The invention belongs to the field of nano material preparation, and particularly relates to water-soluble fluorescent magnetic nano particles and a preparation method thereof. The invention adopts the technical scheme that the method comprises the following steps of: preparing magnetic nano particles by adopting a solvent thermal method, coating a SiO2 shell layer on the surface of the magnetic nano particles by hydrolysis of ethyl orthosilicate under the alkali condition, and connecting -NH2 to the outermost layer through a silane coupling agent with amino; and finally, mixing two kinds of aqueous solution, adding a connecting agent such as ethylene dichloride (EDC) or the like, and connecting the magnetic nano particles and quantum dots through chemical bonds formed by condensation reaction between amino and carboxyl to obtain the fluorescent magnetic nano particles. The fluorescent magnetic nano particles obtained by the technical scheme have low toxicity, good stability and magnetic response and excellent fluorescence; and the method has short experimental period, simple and safe operation and low raw material cost, can be completed in a common chemical laboratory, and lays a foundation for wide popularization and application.

An apparatus including a spin to charge conversion node; and a charge to spin conversion node, wherein an input to the spin to charge conversion node produces an output at the charge to spin conversion node. An apparatus including a magnet including an input node and output node, the input node including a capacitor operable to generate magnetic response in the magnet and the output node including at least one spin to charge conversion material. A method including injecting a spin current from a first magnet; converting the spin current into a charge current operable to produce a magnetoelectric interaction with a second magnet; and changing a direction of magnetization of the second magnet in response to the magnetoelectric interaction. A method including injecting a spin current from an input node of a magnet; and converting the spin current into a charge current at an output node of the magnet.

The invention relates to a preparation method of a magnetic functionalized graphene oxide based molecularly imprinted hybrid material. The preparation method comprises the following steps: firstly, loading Fe3O4 magnetic nanoparticles on the surface of graphene oxide by chloroformylation reaction; and synthesizing the magnetic functionalized graphene oxide based molecularly imprinted hybrid material on the surface of the magnetic functionalized graphene oxide serving as a carrier by utilizing a molecular imprinting technology. The prepared magnetic functionalized graphene oxide based molecularly imprinted hybrid material can be used for selectively removing estrogen in drinking water. The preparation method of the magnetic functionalized graphene oxide based molecularly imprinted hybrid material has the advantages that the process is reasonable and easy to implement; when being used for removing endocrine disruptors, the material has good chemical stability and reusability, and active adsorption, identification and separation of the estrogen are easily carried out; and the preparation method has strong magnetic response, preordainment, identity and practicality, and can greatly improve the using efficiency of the molecular imprinting technology and expand the range of molecular imprinting applications.

The present invention relates to magnetic flow meters comprising a floating member, made of magnetically responsive material and residing within a tubular conduit, through which the fluid flows. The flow meters are provided with a means for producing magnetic field in the conduit. A response signal is generated upon displacement of the float member within the magnetic field by the flowing fluid. Flow rate value is obtained by processing the response signal and comparing it with a calibration curve.

The invention discloses an integration detection system of pulse eddy current stress cracking and a method thereof. The system comprises a signal stimulating module, a magnetic sensor module, a strain-gauge bridge module, a signal conditioning module, a data acquisition module and a computer processing module. In the method, on the basis of combining pulse eddy current excitation coils with strain-gauge sensitive elements, the required differential stable value for strain measurement and the required differential transient value for pulse eddy current measurement are obtained, and a two-dimensional magnetic sensor array is adopted to carry out high-resolution magnetic response imaging; and by adopting a simulation test and an actual test, signal separation, feature extraction and data fusion are performed to achieve simultaneous on-line detection of material surface defects, subsurface defects and stress and microstructure state, achieve recessive defect judgment of materials and estimation of defects which are not formed, and provide necessary information for health monitoring and life estimation of an aircraft structure.

The invention discloses a preparation method for gold magnetic composite nanometer particles. Firstly, magnetic nanometer particles of Fe3O4 are prepared by using a chemical co-precipitation method, the surface of the magnetic particles are modified by a silane coupling agent, then with the modified nanometer particles of Fe3O4 as seeds and oil amine as a reduction agent, gold ions are reduced to metallic gold on the surface of the magnetic nanometer particles in an ultrasonic condition, then the nanometer particles are prepared. The nanometer particles have the advantages of good dispersion, strong magnetic response and having double bonds that can lead to polymerization reaction on the surface of the particles. The nanometer particles have the diameter of 30 to 50nm and saturation magnetization of 6.8 to 17.6 emu per gram, thus showing super paramagnetism. The nanometer particles not only have magnetic response function, but also can carry out polymerization reaction with a plurality of functional monomers, thus having wide application prospect in a plurality of fields, targeted drug control and release, hyperthermia, isolation of protein and enzyme, etc.

A preparation method of nanospheres with core-shell structure having a shell of silicon dioxide belongs to the nanometer material technology field and comprises the steps of: (1)dispersing magnetic particle or aggregate of magnetic particle and quantum dot particle into alkaline water solution; (2) solving the surface active agent into non-polar solvent; (3)mixing the solution obtained from step (1) with the solution obtained from step (2) with a volume ratio of 1:1000-1:1, and obtaining emulsion or microemulsion by ultrasound or vortex mixing method; (4)adding tetraethoxysilane into emulsion or microemulsion and agitating, wherein, the volume of tetraethoxysilane occupies 0.1~10% of the emulsion volume; (5)centrifuge washing and drying. The nanosphere of the present invention has magnetic response property, or has magnetic response property and photoluminescent property synchronously, and has uniform grain size, besides the preparation method is simple.

Sequencing-by-synthesis (SBS) method is provided that includes providing a detection apparatus that includes an array of magnetically-responsive sensors. Each of the magnetically-responsive sensors is located proximate to a respective designated space to detect a magnetic property therefrom. The detection apparatus also includes a plurality of nucleic acid template strands located within corresponding designated spaces. The method also includes conducting a plurality of SBS events to grow a complementary strand by incorporating nucleotides along each template strand. At least some of the nucleotides are attached to corresponding magnetic particles having respective magnetic properties. Each of the plurality of SBS events includes detecting changes in electrical resistance at the magnetically-responsive sensors caused by the respective magnetic properties of the magnetic particles. The method also includes determining genetic characteristics of the complementary strands based on the detected changes in electrical resistance.

The present invention relates to a magnetic nano crystal which is prepared with the ''one-port'' method and can be highly dissolved and steadily dispersed in the biological buffer liquid. Under the condition that the biocompatibility polymer exits or the biocompatibility polymer, the small-molecule amine with alkyl chain, carboxyl acid or alcohol exist together, the metal precursor is decomposed with high temperature in the high boiling point nonpolar or high boiling point weak-polar solvent for preparing the high-crystallinity magnetic nano crystal with different kind, different dimension and different shapes. The technical method adopted by the invention has the characters of simple technique, easy operation. The grain diameter of the magnetic nano crystal prepared with the technique has the advantages of uniformity, controllability, high crystallinity, strong magnetic response and good biocompatibility. Most important, the dry powder of the obtained magnetic nano crystal still represents excellent dissolvability after placing in the biological buffer liquid for a long time. Therefore, the biocompatibility magnetic nano crystal prepared by the technical method has the characters of easy storing and transportation, and is suitable for large-scale and commercial production.

A system for modulating a magnetic field sensor device comprising: a base; a magnetic sensor comprising a plurality of magnetic components; at least one coil for creating a magnetic field around the magnetic sensor; the at least one coil adapted to be connected to an alternating current source that passes through the coil to modulate the magnetic field at the magnetic sensor and drive at least one of the magnetic components of the magnetic sensor into and out of its region of increased magnetic response while shifting the frequency of the magnetic field that is sensed by the magnetic sensors a higher frequency to thereby minimize 1 / f-type noise, where f is the frequency of operation of the magnetic sensor. The method comprises forming at least one coil around the magnetic sensor; connecting the coil to an alternating current power source; and modulating the current from the power source.

A method for identifying, measuring, and monitoring metal loss through corrosion ferromagnetic piping includes drive coils secured to the pipe and driven to emit a magnetic field which is transmitted through the object by magnetic domains in the object. Response coils detect the magnetic domains and generate a response signal. Response coils may be saddle or loop coils, or printed coils on flexible substrates that are applied to conform to the pipe peripheral surface. The system operates reiteratively over an extended period of time to detect loss of magnetic domains which is an important indicator of corrosion and deterioration of the object.

A magnetism fluorescence composite mainly consists of modified magnetism crystal material, modified fluorescent semiconductor crystal material and matrix material; among them modified magnetism crystal material uses silylating reagent partaking -NH2, -C=C, -SH, -S-S or epoxy group; modified fluorescent semiconductor crystal material uses Reactive surfactant. The composite of this invention not only has excellent fluorescence property but also has conspicuous magnetic response property, its merit is not only fluorescent nanometer crystal and magnetism nanometer particle link with basis material possessing tight Structure through chemical bond, but also the integration of fluorescence and magnetism provides new application for high sensitive bioanalysis and detection.

The invention relates to a method for preparing magnetic polyacrylamide / zirconium alginate gel beads. The method comprises the following steps: preparing a hydrophilic Fe3O4 nano-magnetic fluid by using a co-precipitation method; adding sodium alginate into the hydrophilic Fe3O4 nano-magnetic fluid, and preparing into a precursor solution of magnetic composite gel with multiple organic solvents; preparing a mixed solution of zirconium oxychloride and ammonium persulfate; and uniformly dropping the obtained gel precursor solution into the mixed solution, and carrying out a chemical cross-linking reaction, thereby obtaining the magnetic polyacrylamide / zirconium alginate gel beads. The adsorption capacity of the material on phosphate in water reaches 42.21mg-P / g, even if the material is recycled for 5 times, the adsorption capacity is basically maintained invariable, and the material has excellent stability and recycling characteristics. The method is simple in preparation process, easily controllable in conditions and suitable for large-scale production. Particularly, due to magnetic responsiveness, the magnetic polyacrylamide / zirconium alginate gel beads can be rapidly separated and recycled in an applied magnetic field and have the characteristics of being high in efficiency, energy-saving and environment-friendly.

The invention provides a magnetic response photonic crystal anti-fake label and a manufacturing method thereof. The magnetic response photonic crystal anti-fake label provided by the invention comprises a plurality of patterns, wherein the patterns comprise polymer substrates and ethylene glycol micro droplets which contain carbon-coated superparamagnetism ferroferric oxide colloidal nanometer particles and are encapsulated in the polymer substrates; single pattern among the patterns at least comprises two kinds of carbon-coated superparamagnetism ferroferric oxide colloidal nanometer particles of different particle diameters. In the magnetic response photonic crystal anti-fake label provided by the invention, the carbon-coated superparamagnetism ferroferric oxide colloidal nanometer particles of different particle diameters are self-assembled respectively to acquire a multi-photon band gap structure under the action of magnetic fields, so that visible light of different wavelengths can be reflected and is superposed to acquire a new colour; and the color can not be copied by common pigment or dye color, has a good anti-fake effect and good color adjustability, and is beneficial to application.

The invention belongs to the technical fields of macromolecular materials and biological medicine, and relates to a medicament loading method for a magnetic macromolecular immunosuppressant with magnetic response performance. The method comprises the steps of adding magnetic particles into immunosuppressant solution to obtain magnetic medicament loading particles of the immunosuppressant by fully and evenly mixing, vibration treatment and the like. The method improves the dispersing state of the immunosuppressant, improves the bioavailability, reduces the dosage, enables the immunosuppressant to have targeting property, reduces the toxic and side effects of the medicament, and can be applied in the targeted treatment. The magnetic medicament loading particles of the immunosuppressant have the advantages of large medicament loading amount, high packing rate, simple method and low cost, and is favorable for popularization.

The invention relates to a method for preparing micro-droplets based on a micro-fluidic chip modification technology. The method adopts a sol-gel method to carry out modification treatment on a micro-fluidic chip. The method has the characteristics of being obvious in modifying effect, simple to operate, and the like; and is suitable for complex-structure or functional micro-droplets such as water-in-oil type micro-droplets, multiple-in-one type micro-droplets, magnetic response type micro-droplets and the like.