摘要:
A method is described for estimating skin thickness over an implanted magnet. A plane is defined that is perpendicular to the skin of a patient over an implanted magnet and characterized by x- and y-axis coordinates. The magnetic field strength of the implanted magnet is measured using an array of magnetic sensors on the skin of the patient. From the measured magnetic field strength, at least one x-axis coordinate in the plane is determined for at least one y-axis zero position on the array where a y-axis component of the measured magnetic field strength is zero. From that, a y-axis coordinate of the at least one y-axis zero is calculated as a function of the at least one x-axis coordinate, such that the y-axis coordinate represents thickness of the skin over the implanted magnet.
摘要:
Method and apparatus for removing high density particles from a biological fluid such as blood using aphaeresis. The particles are preferably sub-micron in size and denser than normally occurring components of the fluid and can be removed by a modified reverse-flow gradient density centrifuge without damaging the fluid. The particles can be provided to a patient in vivo or added to the fluid after it is removed from the patient. Some particles can carry and deliver oxygen and scavenge carbon dioxide. Other particles are conjugated to capture molecules for attaching to targets such as cancer cells, viruses, pathogens, toxins, or excess concentrations of a drug or element in the fluid. The targets are then removed from the fluid along with the particles by the aphaeresis instrument.
摘要:
An apparatus (20) for navigating a magnet tipped medical device (24) through the body includes a magnet system (22) for applying a magnetic field to the magnet tipped distal end of the medical device to orient the distal end (78) of the medical device; a computer (26) for controlling the magnet system to generate a specific magnetic field in the body part; first and second imaging devices (28) (30) connected to the computer, for providing bi-planar images of the body part through which the medical device is being navigated ; first, and second displays (32) (34) for displaying the images from the image devices; and an input device (36) for inputting points identifying the desired path of the medical device on each of the displays. The computer is programmed to determine the magnetic field necessary to control/orient the medical device on the path input on the displays.
摘要:
A method for site specific treatment of diseased tissue in a patient, comprising the steps of: (i) selecting at least a magnetic material which has a magnetic heating efficiency of at least about 4.5 x 10 J.m./A.g, when magnetic field conditions are equal to or less than about 7.5 x 10 A/s; (ii) delivering the magnetic material to diseased tissue in a patient; and (iii) exposing the magnetic material in the patient to a linear alternating magnetic field with a frequency of greater than about 10 kHz and a field strength such that the product of field strength, frequency and the radius of the exposed region is less than about 7.5 x 10 A/s to generate hysteresis heat in the diseased tissue.
摘要:
A method and apparatus is provided for electrically simulating magnetotherapy to a living body. The apparatus comprises a permanent magnet (17) and a coil (23) surrounding the permanent magnet (17). A voltage is applied across the coil (23) in a direction to enhance the magnetic flux in the permanent magnet (17). The coil is made of a D-block transition metal such as copper which has free electrons. The negative charge of these free electrons is thought to attract the positive electromagnetic charge of the enhanced magnetic flux so a magnetic flux can be electromagnetically transferred with the electron flow through the permanent magnet (17) and conductors (21') through terminals (3) and (5) to enable the magnetic flux to pass to and through the living body. The conductors (21') and any further conductors connected to the terminals (3) and (5) and used to make physical contact with the living body should also be of a D-block transition metal. The circuit has an output circuit (21) which will assist the flow of the magnetic flux through the living body. The output circuit has two coils (25, 27) which boost the magnetic flux to thereby assist the flow of the magnetic flux.
摘要:
Described here are devices, systems, and methods for forming a fistula between two blood vessels. Generally, the systems may comprise a first catheter and a second catheter, which may comprise one or more fistula-forming elements. The first and second catheters may comprise one or more magnetic elements, which may be used to assist in bringing the first and catheters in closer proximity to facilitate fistula formation. In some variations, the magnetic elements may have magnetization patterns such that the flux generated by the magnetic elements is locally concentrated. In some instances, the system may comprise a magnetic control device, which may comprise a magnet, and may be used to increase or create an attractive force between the first and second catheters.
摘要:
Described here are devices, systems, and methods for forming a fistula between two blood vessels. Generally, the systems may comprise a first catheter and a second catheter, which may comprise one or more fistula-forming elements. The first and second catheters may comprise one or more magnetic elements, which may be used to assist in bringing the first and catheters in closer proximity to facilitate fistula formation. In some variations, the magnetic elements may have magnetization patterns such that the flux generated by the magnetic elements is locally concentrated. In some instances, the system may comprise a magnetic control device, which may comprise a magnet, and may be used to increase or create an attractive force between the first and second catheters.