169 results about "Magnetic actuation" patented technology

A magnetic actuation urethral valve is adapted for inserting into the urethra of a patient who suffering from urinary incontinence in order to recover control of urine flow. The valve member is driven by a magnet rotor which is magnetically actuated by a rotating magnetic field generated from a controller outside the body. There is also an actuation device for the user to discharge by inserting an indwelling catheter into the valve in case the valve does not work for any reason.

Magnetically and electromagnetically driven MEMS devices for reflecting light signals and for switching radio frequency (RF) signals are provided. In a preferred embodiment, a light reflecting device such as a mirror or micro-scanner comprises a plate operative to reflect light and at least two conductive flexural actuators connected to the plate and to a substrate and operative to impart a rotation or tilt motion to the plate under a force arising from the interaction of a current passing through the conductive flexural actuators and a magnetic field parallel to the substrate. An RF switch comprises a substrate and a membrane having a longitudinal dimension and a lateral dimension, the membrane positioned substantially parallel to and attached to the substrate and operative to provide at least two switching positions in response to actuation by a Lorenz force acting on it.

A system that includes a magnetically actuated motion control device comprising a housing defining a cavity and including a slot therethrough. A movable member is located within the cavity and is movable relative to the housing. A magnetic field generator located on either the housing or the movable member causes the housing to press against the movable member to develop a friction force.

Electromagnetic actuators capable of generating a symmetrical bidirectional force are disclosed. The electromagnetic actuators include a housing made of a ferromagnetic material and a shaft made of a magnetically inert material movable along an axis within the housing. In one type of actuator, captive permanent magnets are arranged on opposite interior end walls of the housing and an electromagnetic coil is mounted on a central portion of the shaft. The electromagnetic coil is capable of generating a force when energized that causes linear displacement of the shaft in either direction along its axis depending on the direction of current through the electromagnetic coil. In another type of actuator, captive electromagnetic coils are arranged on opposing inner end walls of the housing, and a permanent magnet is mounted on a central portion of the shaft. The electromagnetic coils are capable of generating a force when energized that causes linear displacement of the shaft in either direction along its axis depending on a direction of current through the electromagnetic coils.

An endoscopic forceps is provided and includes a housing having a shaft that extends therefrom. An end effector assembly is operatively connected to a distal end of the shaft and includes a pair of first and second jaw members that are pivotably coupled to one another and movable relative to one another. The first and second jaw members are disposed in a first configuration, wherein the first and second jaw members are disposed in spaced relation relative to one another, to a second configuration, wherein the first and second jaw members cooperate to grasp tissue therebetween. A magnetic actuation mechanism is operably coupled to one or both of the first and second jaw members and configured to generate opposing magnetic fields on each of the first jaw and second jaw members to actuate the first and second jaw members between the first and second configurations.

The invention relates to a magnetic actuator comprising at least one coil (14) surrounded by a magnetic circuit (10), the magnetic circuit possessing:

• • three legs (12.1, 12.2, 11), comprising two outer legs on either side of the coil (14) and an intermediate leg passing through the coil, these legs having no direct mechanical contact with one another; and
  • two facing end plates (17, 18) magnetically interconnecting the three legs (12.1, 12.2, 11). The magnetic circuit comprises a moving armature (21) comprising at least one of the end plates (18), and a stationary portion (200) including a yoke (22) having at least the other one of the end plates (17) and at least one permanent magnet (13), the permanent magnet (13) being placed at one end of the intermediate leg (11) beside the end plate (17) of the yoke (22). The invention is applicable to controlling medium-voltage and high-voltage circuit breaker vacuum chambers.

The actuator (40) has two permanent magnets located in two pistons, respectively, and a coil for producing a coil magnetic flux. One of the selected permanent magnets produces a magnetic force such that such that a magnet attractive force produced by the selected permanent magnet is reduced. Two springs pretension two control pins (601, 602) in a forward direction, respectively, where the pins move towards engaging grooves (14, 24) in the forward direction. The coil is alternately energized in two directions such that the direction of the flux is changed in the two directions.

A magnetically actuated apparatus, which enlarges, extends and makes continuous magnetic fields used by magnetically controlled devices, such as a magnetic reed switch for use in physical security monitoring systems is shown. Apparatus includes a sensor and a magnetic actuator for use with a movable closure member. The sensor is mounted into to a fixed support member that is arranged for displacement relative to a second movable support member. The sensor has a pair of contacts that are connectable to an electronic circuit. The contacts form a switch that is actuated by the magnetic actuator. The magnetic actuator comprises a unique elongated magnet with specific polarity or a plurality of aligned, alike permanent magnets that are mountable to the second support member. The aligned magnets have like magnetic fields that align one another and combine to form an effective magnetic actuation field that has a given magnitude and a given direction that is greater that the magnitude and direction than any one of the magnets. The elongated magnet has a specific pole for a given distance as its controlling means. The effective magnetic actuation field increases the distance in which the movable support member is displaceable relative to the fixed support member without changing the electric condition of the sensor. The present invention creates a magnetic apparatus, having a wider and controllable gap and break point distance not found in the present art.

An active implantable medical device (AIMD) having a magnetic shield on its housing for shielding the interior of the device from magnetic fields generated outside the housing. Magnetic shielding is created using a magnetically absorbing coating on the inner surface of the housing. The AIMD includes the remaining enclosure area without magnetic shielding, ie the magnetic window, adjacent to the magnetic actuating device located within the enclosure. This magnetic window allows actuation of the magnetic starting device.

External magnetically actuated valve for an artificial intraurethral urinary sphincter. External magnetically actuated valve for an artificial intraurethral urinary sphincter, allowing urine control for people suffering from urinary incontinence or retention, by the application of an external magnetic field. After valve (1), object of the present invention, is placed in the patient's urethra (9), said patient may control urination. Urine is evacuated when a permanent magnet (3) is approached to the body of the patient. Closing is automatic. The system is provided with a safety system to prevent over pressures in bladder (8).

A method for controlling the movement of magnetic or magnetizable objects (10) in a biosensor cartridge. The method comprises the step of providing a biosensor cartridge with a laterally extending sensor surface (A) and at least a magnetic field generating means (20, 30, 30′) for generating a magnetic field with a field gradient substantially perpendicular to the sensor surface (A). The magnetic field generating means (20, 30, 30′) are alternatingly actuated such that the generated magnetic field directs alternatingly the magnetic or magnetizable objects (10) substantially perpendicular to the sensor surface (A) away and toward the sensor surface, wherein pulse lengths of the alternating actuation are adjusted such that a lateral movement of magnetizable objects along the laterally extending sensor surface is substantially avoided.

An electromagnetic actuating two-dimensional rapid deflecting mirror system comprises a reflector module, a movable table module and a fixed table module, wherein the reflector module, the movable table module and the fixed table module are connected in sequence; the movable table module comprises a permanent magnet assembly and a supporting board assembly; the fixed table module comprises an electromagnet assembly; the permanent magnet assembly and the supporting board assembly are fixedly connected; the electromagnet assembly is powered on to generate a magnetic field to drive the permanent magnet assembly to move; the supporting board assembly deflects along the horizontal axis of the supporting board assembly under movement of the permanent magnet assembly; the supporting board assembly deflects to drive the reflector module to deflect. The reflector module deflects due to the drive torque of the permanent magnet and the electromagnet, supply voltage is low, motion stroke is large, and the hysteresis and creep are avoided. Meanwhile, the position of the fixed table module does not change in the whole process of driving the reflector module to deflect, and the whole system is more stable and reliable.

Apparatus and methods are disclosed for selectively positioning a collimator body. The apparatus comprises support means adjustably supporting the collimator body; and adjustment means for selectively adjusting the collimator body, the adjustment means comprising an actuator component having a driver coil and a magnetic structure with a first gap formed therebetween; wherein an electrical current through the driver coil of the actuator component causes the collimator body to move perpendicular to a magnetic field created by the magnetic structure of the actuator component. The method comprises supporting the collimator; and adjusting the collimator body using an actuator component having a driver coil and a magnetic structure with a first gap formed therebetween; wherein an electrical current through the driver coil of the actuator component causes the collimator body to move perpendicular to a magnetic field created by the magnetic structure of the actuator component.

The invention provides an electromagnetic actuator. A coil (451,452) generates a magnetic flux (Phi 1) in the opposite direction of either of first and second permanent magnets (521,522) so as to reduce magnetic attraction for attracting corresponding plunger pistons (651,652). First and second advance springs (761,762) operate in an advance direction through push force; when the coil (451,452) is powered on, either of a first/second pin (601,602) on the side with smaller magnetic attraction is used as an operation side limiting pin. When the corresponding plunger pistons (651,652) are attracted to a preset distance of corresponding permanent magnets (521,522), obstruction components (591,592) and the corresponding plunger pistons (651,652) are in contact to resist backstep. A resistance push portion (581,582) applies a resistive load in the direction of resisting permanent magnet attraction to the obstruction components (591,592). A load adjusting portion (571,572) can adjust the resistive load of the resistance push portion (581,582).