50results about How to "Low magnetic susceptibility" patented technology

The subject invention pertains to a method and apparatus for placing a minimally-invasive access with respect to a patient's bone or other non-soft tissue. The subject invention can use a drilling machine incorporating an ultrasound motor. The subject drilling machine can be applied to sample, for example, bone biopsies under MRI control. In a specific embodiment, the subject ultrasound motor can be completely manufactured of non-magnetic materials, such as plastics, titanium, and titanium alloy, or ceramics and piezoceramics. The subject drilling apparatus can be placed into an MRI near field without influencing the image quality, and without the drilling apparatus itself being disturbed by the MRI magnet, gradient, or high-frequency field. The subject invention can incorporate good shielding with the subject drilling apparatus use of these materials, and can achieve minimal, if any, image distortions or so-called artifacts. Thus, the subject invention can involve the problem by use of non-magnetic materials of low magnetic susceptibility for the design of an actuation unit.

A wireless headset capable of receiving audio signals transmitted wirelessly and compatible for use in an MRI scanner is disclosed. The headset includes a first wireless module connected to the first earphone and a second wireless module connected to the second earphone. Each wireless module is electrically connected to a speaker in the respective earphone. The first wireless module receives the audio signal from a remote source and coordinates transmission of the audio signal to each of the speakers. The compact nature of each earphone minimizes the length of wire runs. In addition, the headset is made of materials having low magnetic susceptibility such that they will not be affected by the magnetic field from the MRI scanner.

Disclosed is a device for assisting the function of a heart that is collapsible to facilitate minimally invasive procedures. The cup-shaped device may be inserted into the chest cavity and deployed on the heart via a specially configured tube. The device comprises a cup-shaped shell expanded by a support cage disposed within the shell, and an elastic cup-shaped liner, together forming an inflatable cavity between the outer surface of the liner and the inner surface of the shell. Alternate application of positive and negative pressures to the cavity provides controlled, active, systolic and diastolic support to the heart.

Disclosed is a process, which is used to eliminate heavy metal cations from the aqueous media, and provides a better solution for the existing problems of the separation systems like low efficiency and high costs. The heavy metal cations selected for this purpose are cadmium, lead and copper. The separation system consists of a two stage process: In the first stage, the iron oxide nanoparticles are suspended in an aqueous medium contaminated with the heavy metal cations. In the second stage, the solution is brought into contact with a ferromagnetic matrix (or a paramagnetic matrix) magnetized by the application of an outside magnetic field. The heavy metal cations are deposited on the matrix under the imposed magnetic field. This two-stage process makes it possible to separate the heavy metal cations from the aqueous medium. The wire matrices are upon the completion of separation washed away by water or air current.

The invention discloses a superconducting weak magnetic signal detection magnetometer comprising a superconducting quantum interference device (SQUID), a nonmagnetic dewar, a three-dimensional triaxial locator, a magnetic flux lock loop, a micro-control processor, a power supply unit, a data signal processing system and a host. The low-temperature superconducting quantum interference device substitutes a conventional induction coil to act as a magnetometer probe so that sensitivity and measurement depth and precision of the magnetometer are enhanced. The superconducting weak magnetic signal detection magnetometer is one of the latest international weak magnetic signal detection equipment. Compared with a conventional electronic magnetometer, the superconducting weak magnetic signal detection magnetometer is high in resolution, high in precision, high in intellectualization and high in stability, and can be applied to geophysical prospecting work, medical heart and brain magnetic measurement and engineering nondestructive detection.

The invention discloses a low-elasticity-modulus and high-strength spinodal decomposition type Zr-Nb-Ti alloy material and a preparation method thereof. The Zr-Nb-Ti alloy material comprises the following components in atomic percentage: 20-50% of Ti, 15-45% of Nb and the balance of Zr. The preparation method comprises the following steps: a titanium source, a niobium source and a zirconium sourceare prepared according to designed ratios; zirconium alloy ingots are obtained through multiple times of smelting; zirconium alloy rods are obtained through the zirconium alloy ingots by suction casting; and solid-solution treatment and aging treatment are performed on the zirconium alloy rods in sequence to obtain the Zr-Nb-Ti alloy material. The zirconium alloy material is higher in strength and low in elasticity modulus; the highest strength can reach 1130.8+ / -8.5 MPa; and the elasticity modulus is maintained between 40-50 GPa, and is near the elasticity modulus of human bodies.

The invention discloses an unshielded magnetocardiogram instrument. The unshielded magnetocardiogram instrument comprises a superconducting quantum interfere device, a non-magnetic Duvel, a magnetic flux locking ring, a signal amplifier, a wave filter, a data acquisition card, an electrocardiograph, a non-magnetic moving bed, an expert disease diagnostic software information system and a master computer. Conventional electric measuring transducers are replaced by the superconducting quantum interfere device as a cardiac weak magnetic signal measuring probe; cardiac weak magnetic signal detection sensitivity and precision are improved; the unshielded magnetocardiogram instrument is the latest international noninvasive cardiac function inspection equipment, and is a novel noninvasive and hypersensitive inspection instrument provided for undiagnosed coronary heart disease patients; the unshielded magnetocardiogram instrument is popular among medical staff and patients, in particular to the patients who are not suitable for exercise tests and catheter inserting and fear of cardiac catheter inspection.

An improved system for providing audio signals to a patient during medical imaging is disclosed. A converter device is operatively connected to a audio signal transmitter such as a pneumatic audio port commonly used for pneumatic headphones. The converter device includes a connecting member removably inserted into the pneumatic audio port. A microphone receives the pneumatic audio signals and converts these signals to electronic audio signals. The converter device further includes a wireless transmitter that converts the electronic audio signals to wireless signals and transmits the wireless signals to a wireless receiver. The wireless receiver may be located in a headset worn by the patient, which receives the wireless signals and provides the audio content to the patient during imaging.

The invention discloses a Zr-based biomedical alloy and a preparation method thereof. The Zr-based biomedical alloy comprises, by weight, 10.5-19% of niobium, 0%-30% of titanium and the balance zirconium and inevitable impurity elements. The preparation method comprises the following steps that (1) the raw materials are weighed according to the proportion and then are fed into a reaction containerof a vacuum smelting furnace for mixing, and vacuum smelting is carried out on the mixture repeatedly under the shielding of inert gas to obtain molten reaction liquid; and (2) cold water is continuously injected to the bottom of the reaction container to make the molten reaction liquid be cooled rapidly until the temperature is reduced to room temperature, and then the Zr-based biological medical alloy is obtained. According to the Zr-based biomedical alloy, the advantages of low modulus, low magnetic susceptibility, excellent mechanical property and the like are realized, so that the problem of stress shielding possibly caused by metal of an implant is solved, reduction of the magnetic susceptibility of metal-based biological implant materials is facilitated, and the influence on MRI (nuclear magnetic resonance imaging) artifacts is reduced.

An apparatus for inductive temperature sensing comprises a coil configuration, a target, and an impedance measurement circuit. The target has a non-zero conductivity and susceptibility and the impedance measurement circuit measures the apparent inductance of the coil configuration at a measurement frequency close to the crossover frequency to provide an indication of temperature of the target.

A hand-operated cleaning device comprises a handle (12) with a grip handle (14) and a securing device (24) which comprises two securing elements (26), and a cleaning head (18) which comprises two attachment elements (28), at least one securing element (26) and the associated attachment element (28) comprising permanent magnets (40, 42) that are embedded in the plastics material. The cleaning head can be a mop cover which comprises a textile element (52) to which attachment elements (28) are secured, at least one of the attachment elements (28) comprising a permanent magnet (42). The flat mop cover has a dimensionally stable design and can be directly coupled to a bar-shaped handle (12). The attachment elements (28) of the mop cover are arranged and designed such as to form a detachable connection with the securing elements (26) of the handle (12).

A magnetic roll having a rotation axis, the magnetic roll including an axial series of segmented rings, each of the rings' segments incorporating a permanent having an outer end, an inner end, an axial end, an oppositely axial end, a circumferential end, a counter-circumferential end, a north pole positioned at the inner or outer end, and a south pole positioned oppositely from the north pole; a bonding matrix rigidly interconnecting the rings; and a magnetic armature operatively spanning between the permanent magnets' inner ends.

The invention discloses a non magnetic corrosion-resistant copper alloy material. It is characterized in that the components and their weight proportion are as follows: Ni 0.05-2%, Al 2-15%, Zn 0.5-8%, 5 Sn 1-10%, and the left are Cu. The non magnetic corrosion-resistant copper alloy material is prepared by adding alloy element with suitable amount, and it possesses good corrosion-resitance property, especially in salty water and atmosphere condition, stable diamagnetism, wide application in ship building industry and instrument material.

The invention relates to the field of medical metal materials, in particular to an Fe-Mn-Cu-C system alloy and medical application thereof. The alloy comprises the components of, by weight, 10-35% ofMn, 0.2-5.0% of Cu, 0.2-1.5% of C, and the balance Fe. The feature that Fe corrodes in the human body environment and is biodegradable is used, the proper amount of Mn, Cu and C elements are added into the Fe, the Fe-Mn-Cu-C system alloy is prepared through casting and forging, and through the synergistic effect of the alloy elements, the mechanical property of the alloy and the corrosion rate ofthe alloy in the living organism environment can be improved, and the material has the various beneficial biological functions. The Fe-Mn-Cu-C system alloy having the mechanical property, degradationproperty and biological activity is especially suitable for implantation device materials in the medical field. Therefore, when products are designed, according to the different clinical applicability, the excellent properties of Fe-Mn-Cu-C materials are sufficiently given full play, and corresponding suture lines, anastomosis nails, cardiovascular stents, braided mesh supports and the like can beprepared.

A Co—Cr—Mo-based alloy includes: 63 mass %≦Co<68 mass %; 15 mass %≦Cr<26 mass %; 10 mass %≦Mo<19 mass %; and the balance of inevitable impurities, wherein the total amount of Cr and Mo is from 32 mass % to 37%. The mass magnetic susceptibility of the alloy is 7×4π·10−9 m3 / kg or less at room temperature, and the Vickers hardness number (Hv) of the alloy is 400 or more.

The invention relates to the field of fuel magnetization energy conservation, in particular to a four-dimensional magnetic suspension auto-modulation recycled oil / gas reformer which comprises a suspension magnetization device main body, permanent magnet porous suspension bodies, plunger type mesoporous suspension auto-modulation magnetic pillars, a plurality of reverse magnetic positioning sealing pads, an upper magnetization cabin sealing cover and a lower magnetization cabin sealing cover, wherein the suspension magnetization device main body is sealed by the upper magnetization cabin sealing cover and the lower magnetization cabin sealing cover; the reverse magnetic positioning sealing pads are arranged inside the sealed suspension magnetization device main body; a four-dimensional magnetic suspension channel is formed between two adjacent reverse magnetic positioning sealing pads; the four-dimensional magnetic suspension channels are formed by the plunger type mesoporous suspension auto-modulation magnetic pillars which are embedded into two permanent magnet porous suspension bodies. The four-dimensional magnetic suspension auto-modulation recycled oil / gas reformer provided by the invention is simple in structure, moreover, the magnetization rate of fuel can be effectively increased, furthermore, the fuel can be more sufficiently combusted, the energy can be relatively well saved, and the environment can be protected.

A method is used for simulating a gravity acting on an object in space. The method comprises inducing a magnetic moment in the object via generation of an external magnetic field in an environment of the object. A device is used for generating a force acting on an object. The device comprises a magnetic device for generating an external magnetic field in an environment of the object and therefore for inducing a magnetic moment in the object. The magnetic device has at least two elements, which can be moved relative to one another for setting the external magnetic field.

The invention relates to a medical degradable Fe-Mg-Ag alloy material and a preparation method thereof. The Fe-Mg-Ag alloy material comprises the following chemical components by weight percentage: 30% of Mn, 1-10% of Ag, and the balance iron. The invention utilizes the characteristic that Fe30Mn alloy can be corroded in the human environment so as to be biodegradable, the positive potential antibacterial element Ag is added into the alloy for smelting in a vacuum arc furnace, and rapid cooling is carried out to obtain the novel degradable iron-based alloy. The alloy has greatly increased degradation rate, is conducive to shortening the degradation time after implantation into the human body and reducing the stimulation of the implant to organisms, and later through release of Ag+, the implant has certain antibacterial properties, thus improving the therapeutic effect of medical devices. The material provided by the invention has good mechanical properties and biocompatibility, and hasmore excellent nuclear magnetic resonance compatibility.

The invention discloses a Zr-Nb-based alloy with good additive manufacturing forming performance and application of the Zr-Nb-based alloy, and belongs to the technical field of metal additive manufacturing. Components of the Zr-Nb-based alloy are from a dual cluster alloy component design model. The expression formula of the alloy element atomic percent (at. / %) is Zr75+ / -2(Zr, Mo, Sn)3.1+ / -0.5(Zr,Ti, Hf, Nb, Ta)21.9+ / -1.5, wherein (Zr, Ti, Hf, Nb, Ta) elements are single, or the mixed total quantity is 21.9+ / -1.5 at. / %, (Zr, Mo, Sn) elements are single, or the mixed total quantity is 3.1+ / -0.5 at. / %, and the total quantity of the other elements is controlled within 1 at.%. The main alloying element of the alloy is the Nb element; the low-elasticity-modulus Nb element has low magnetic susceptibility; meanwhile, grains of the alloy can be refined; the oxidization resistance of alloy melt and melt stability are improved; liquid-solid phase areas are reduced; flowability is enhanced; andthe alloy has good melt and solid structure compatibility and can be used for additive manufacturing forming.

A method for producing a housing is provided. In a first method step, connecting a material plate, having a main extension plane in each case, of the first, second and third material, respectively, in the first and second connection regions, the first and second connection region extending parallel to the main extension planes of the material plates in each case; in a second connection step, processing the interconnected material plates in order to produce the first, second and third zones of the housing.

Provided is a biocompatible alloy having low magnetic susceptibility and excellent mechanical properties. The biocompatible alloy according to the present invention contains: Zr as a main component; Nb of not less than 0.1% by mass and not greater than 25% by mass; Mo of not less than 0.1% by mass and not greater than 25% by mass; and Ta of not less than 0.1% by mass and not greater than 25% by mass. A total content of Nb, Mo, and Ta in the biocompatible alloy is not less than 2% by mass and not greater than 50% by mass. The biocompatible alloy has a mass susceptibility of not greater than 1.50×10−6 cm3 / g. The biocompatible alloy has a Young's Modulus of not greater than 100 GPa. Various biocompatible implants and medical devices can be manufactured from the biocompatible alloy.

The invention provides a low-magnetic-susceptibility beta-type Zr-Nb-Ta series alloy which comprises the following components in percentage by weight: 10% of Nb, 10% to 20% of Ta, and the balance Zr and inevitable impurities, wherein the weight percentage of Zr is higher than 50% and the optimal weight percentage of Ta is 15%. The low-magnetic-susceptibility beta-type Zr-Nb-Ta series alloy is better matched with the elasticity modulus of natural bone and lower in magnetic susceptibility. The invention further provides a preparation method of the low-magnetic-susceptibility beta-type Zr-Nb-Ta series alloy. According to the preparation method, the content of Nb is set as a critical point of the transformation from the alpha phase to the beta phase; on the above basis, Ta is added as an alloying element; accordingly, metastable beta-Zr can be obtained at room temperature; meanwhile, the solution strengthening effect can be achieved; the shaping and processing properties of the low-magnetic-susceptibility beta-type Zr-Nb-Ta series alloy can be prevented from being influenced when the strength of the low-magnetic-susceptibility beta-type Zr-Nb-Ta series alloy is improved; and furthermore, the corrosion resistance of the low-magnetic-susceptibility beta-type Zr-Nb-Ta series alloy can be enhanced.

A Co—Cr—Mo-based alloy includes: 63 mass %≦Co<68 mass %; 15 mass %≦Cr<26 mass %; 10 mass %≦Mo<19 mass %; and the balance of inevitable impurities, wherein the total amount of Cr and Mo is from 32 mass % to 37%. The mass magnetic susceptibility of the alloy is 7×4π·10−9 m3 / kg or less at room temperature, and the Vickers hardness number (Hv) of the alloy is 400 or more.

The invention relates to a medical degradable Fe-Mg-Ag alloy material and a preparation method thereof. The Fe-Mg-Ag alloy material comprises the following chemical components by weight percentage: 30% of Mn, 1-10% of Ag, and the balance iron. The invention utilizes the characteristic that Fe30Mn alloy can be corroded in the human environment so as to be biodegradable, the positive potential antibacterial element Ag is added into the alloy for smelting in a vacuum arc furnace, and rapid cooling is carried out to obtain the novel degradable iron-based alloy. The alloy has greatly increased degradation rate, is conducive to shortening the degradation time after implantation into the human body and reducing the stimulation of the implant to organisms, and later through release of Ag+, the implant has certain antibacterial properties, thus improving the therapeutic effect of medical devices. The material provided by the invention has good mechanical properties and biocompatibility, and hasmore excellent nuclear magnetic resonance compatibility.

The invention provides a biomedical zirconium-based nickel-free low-susceptibility shape memory alloy, a preparation method thereof and a biomedical material, and belongs to the technical field of alloy materials. The alloy comprises 3.40-3.60 at.% of Sn, 7.40-8.60 at.% of Nb and the balance of Zr. According to the alloy, zirconium is used as a matrix and is a common trace element in the human body, and the added elements Nb and Sn have good biocompatibility; and the zirconium alloy has two stable phases (beta phase and alpha phase) and three metastable phases (alpha'' phase, alpha' phase and omega phase), and the phase composition can be effectively changed by adding Sn and Nb with specific contents, so that the biomedical alloy with superelasticity and a shape memory effect is obtained. Meanwhile, the susceptibility of the alloy is 1.176 * 10 <-6 >-1.294 * 10 <-6 > cm < 3 > g <-1 >, which is far lower than that of a traditional Ti-Ni alloy.

The invention relates to a biodegradable Fe-Mn-C ternary iron alloy material in the field of biological medical materials. The alloy material comprises the following components by weight: 1-45% of Mn, 0.5-2.5% of C, and the balance iron. In the invention, the characteristic that the metal iron can corrode in a human body environment so as to be biodegraded is utilized, and Mn and C elements are added into pure iron to improve the corrosion rate of the pure iron in an organism environment, so that after the material is implanted in the body, the degradation time can be shortened, the stimulation on the organism can be reduced, and the treatment effects of medical devices can be improved. The material provided in the invention has good biocompatibility and mechanical properties, as well as better MRI (magnetic resonance imaging) compatibility, thus being able to be used as an intravascular stent material.