摘要:
Apparatus and methods are described for use with a subject suffering from cancer. A nanoparticle (22) includes an inner core (30) that comprises a phase-change material that is configured to absorb latent heat of fusion by undergoing a phase change. An outer layer (32) disposed around the inner core includes a plurality of nano-spheres (34) of at least one metal, and a plurality of molecules (38) of a substance that binds preferentially with cancerous cells relative to non-cancerous cells. The nanoparticle has a volume of at least 65,000 nm3 and is elongatable into an ellipsoid, such that, when the nanoparticle is maximally elongated, each of the semi-axes defined by the ellipsoid is greater than 5 nm, and at least two of the semi axes of the ellipsoid are less than 30 nm. Other applications are also described.
摘要:
An apparatus and method for magnetic particle manipulation enables the particle to be rotated and translated independently using magnetic fields and field gradients, which produce the desired decoupled translational and rotational motion. The apparatus and the method for manipulation may be implemented in parallel, involving many particles. The rotational magnetic field used to induce rotational motion may be varied to induce particle motion, which is either in phase or out of phase with the rotational magnetic field. The magnetic fields and gradients described herein may be generated with permanent magnets, electromagnets, or some combination of permanent magnets and electromagnets.
摘要:
Examples of systems and methods for providing alternating magnetic field therapy are provided. One example method includes the steps of positioning a target proximate to a first end of an alternating magnetic field (AMF) head, the AMF head comprising an electrical coil and a ferromagnetic core, the electrical coil having a substantially circular cross-section that is substantially centered on a first axis, the AMF head having the first end corresponding to a first end of the coil and a second end corresponding to a second end of the coil; generating and transmitting an alternating current (AC) signal to the AMF head; determining a temperature of the target based on a sensor signal from a temperature sensor; in response to determining the temperature, modifying the AC signal based on a difference between the temperature and a predetermined target temperature.
摘要:
The present invention relates to a radiofrequency (RF) hyperthermia device comprising a radiofrequency carrier signal generator (1), a radiofrequency amplifier (4), an electrode (6) and a counter-electrode (7), a first impedance measuring means (2), a first impedance matching means (3), a second impedance measuring means (5), and at least one second impedance matching means (8 or 8'), wherein the at least one second impedance matching means is configured and adapted to match the second impedance measured by the second impedance measuring means to the predetermined value. This radiofrequency (RF) hyperthermia device is designed for the hyperthermia treatment by optimized double impedance matching system.
摘要:
Disclosed herein are iron oxide nanoparticles having an iron (II) content in a metastable state that is intermediate the iron (II) content of wüstite and magnetite. The disclosed iron oxide nanoparticles exhibit unexpectedly beneficial magnetic properties (e.g., saturation magnetization) resulting from both the size of the nanoparticles and the iron (II) content. Accordingly, the iron oxide nanoparticles are attractive for magnetic imaging applications, such as magnetic particle imaging. Methods of forming the iron oxide nanoparticles are also provided, such methods including a controlled oxidation step wherein a small amount (e.g., 1%) of gaseous oxygen is exposed to wüstite nanoparticles for a defined period of time sufficient to partially oxidize the wüstite but prevent conversion entirely to magnetite. Finally, methods of using the iron oxide nanoparticles are also provided. Representative methods include magnetic particle imaging, magnetic resonance imaging, and hyperthermia.
摘要:
Apparatus, comprises: an implantable element (20) configured to be implanted within a body of a subject; and a phase-change material (22). The phase-change material (22) is configured: to be implanted within the subject's body in a vicinity of the element (20), and to absorb heat from the element (20) by absorbing latent heat of fusion resulting from a phase-change of the phase-change material selected from the group consisting of: wax to liquid, solid to liquid, solid to gel, and gel to liquid, in response to the element being heated.
摘要:
In this disclosure, we describe a method for the treatment of tumor(s) or tumor cell(s) or cancer(s) in a subject in need by the generation of heat. The latter is produced by chains of magnetosomes extracted from whole magnetotactic bacteria and subjected to an alternative magnetic field. These chains of magnetosomes yield efficient antitumoral activity whereas magnetosomes unbound from the chains or kept within the whole bacteria produce poor or no antitumoral activity. The introduction of various chemicals such as chelating agents and/or transition metals within the growth medium of the bacteria improves the heating properties of the chains of magnetosomes. Moreover, the insertion of the chains of magnetosomes within a lipid vesicle is also suggested in order to favor their rotation in vivo and hence to improve their heating capacity. The vesicle can contain an antitumoral agent together with the chains of magnetosomes. In this case, the agent is released within the tumors by heating the vesicle.