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5742 results about "Magnetic tension force" patented technology

The magnetic tension force is a restoring force (SI unit: Pa·m⁻¹) that acts to straighten bent magnetic field lines. It equals: (𝐁·∇)𝐁/μ₀ (S.I.) (𝐁·∇)𝐁/4π (c.g.s.) It is analogous to rubber bands and their restoring force. The force is directed antiradially. Although magnetic tension is referred to as a force, it is actually a pressure gradient (Pa m⁻¹) which is also a force density (N m⁻³). The magnetic pressure is the energy density of the magnetic field which can be visualized as increasing as magnetic field lines converge in a given volume of space.

Magnetic drive metering pump

A magnetic drive metering pump in which a movable thrust member fixed to a connecting rod is axially movable in a longitudinal axis in a magnet shroud anchored in a pump housing so that the thrust member with the connecting rod, on electrically driving (actuating) the magnetizing coil, is drawn into the magnet shroud against the force of a recuperating spring, reducing an air gap between the thrust member and an inner face of magnetic shroud, into a bore in the magnet shroud and after deactivating the magnet the thrust member is returned to the starting position by the recuperating spring so that the thrust member and an elastic displacement member actuated thereby on carries out an oscillating motion continued activation and deactivation of the magnetizing coil, which diaphragm cooperates alternately with an outlet and an inlet valve to produce a pump stroke (pressure stroke) and a priming stroke in a metering head arranged in the longitudinal axis. In such a magnetic drive metering pump, a reference element is associated with the module constituted by the thrust member and connecting rod, the position of which reference element is detected by a positional sensor, wherein the positional sensor provides an actual signal which is in a fixed relationship to the position of the reference element, and in that the motion of the unit formed by the thrust member and the connecting rod is influenced as regards control accuracy via a control circuit so that it follows a predetermined nominal profile.

Magnetic devices and applications for medical/surgical procedures and methods for using same

One embodiment of the invention comprises a trocar and a reducer cap that magnetically attaches to the trocar. The trocar and the cap each include a magnetic member, at least one of which is a first magnet, and the other of which is either a second magnet or a non-magnetized magnetically permeable member. Including a magnet of sufficient strength in the trocar and/or the cap will create a magnetic field that automatically holds a surgical instrument having a magnetically permeable member at its tip in axial alignment with the cap or trocar lumen. Introduction of the surgical instrument into the lumen can be further facilitated by providing the trocar or cap lumen with a funnel-shaped opening. A lumen seal can be provided by one or more compliant toroidal seal members that expand radially inwardly when compressed axially by the magnetic attraction between the cap and trocar. The alignment feature is particularly advantageous when incorporated in a mini-trocar having a lumen on the order of 1-3 mm in diameter. In that case, a trocar cap can be a small disc magnetically attracted to the trocar to cover the lumen. Magnetic aligning devices according to the invention can be used internally of a patient or transdermally. Another embodiment of the invention is an ostium plug with a lumen therethrough that can be used in tubal sterilization. The plug is permanently implanted in the patient, but a cap is coupled magnetically to the proximal end of the plug to permit reopening of the lumen when desired.

Magnetic haptic feedback systems and methods for virtual reality environments

A haptic feedback system comprises a moveable device with at least three degrees of freedom in an operating space. A display device is operative to present a dynamic virtual environment. A controller is operative to generate display signals to the display device for presentation of a dynamic virtual environment corresponding to the operating space, including an icon corresponding to the position of the moveable device in the virtual environment. An actuator of the haptic feedback system comprises a stator having an array of independently controllable electromagnet coils. By selectively energizing at least a subset of the electromagnetic coils, the stator generates a net magnetic force on the moveable device in the operating space. In certain exemplary embodiments the actuator has a controllably moveable stage positioning the stator in response to movement of the moveable device, resulting in a larger operating area. A detector of the system, optionally multiple sensors of different types, is operative to detect at least the position of the moveable device in the operating space and to generate corresponding detection signals to the controller. The controller receives and processes detection signals from the detection sensor and generates corresponding control signals to the actuator to control the net magnetic force on the moveable device.
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