Electromagnetic actuator for a surgical instrument

摘要

The invention relates to an electromagnetic actuator for a surgical or medical instrument, the actuator having a stator (19) and a displaceable element (10), which at least partially comprises a paramagnetic or ferromagnetic material and can be displaced from a first position into a second position by applying an electromagnetic field.;The invention is characterized in that the displaceable element (10) is or will be held in the first or in the second position by a permanent magnet.

主权项

1. An electromagnetic actuator for a surgical or medical instrument, the actuator comprising:
a stator, the stator comprising two permanent magnets which are poled repelling each other; a displaceable element which at least partially has a ferromagnetic material and can be displaced from a first position into a second position by applying an electromagnetic field, the displaceable element having a hollow interior between a proximal opening and a distal opening, at least one optic lens disposed in the hollow interior, two stops which define the first and the second position; and a ferromagnetic material disposed between the two permanent magnets of the stator, the ferromagnetic material having a concavity; and a tube, wherein the displaceable element is disposed in the tube so as to be movable in a longitudinal direction of the tube; wherein the displaceable element is or will be held in the first position by a permanent magnetic field and after displacement into the second position is or will be held in the second position by a permanent magnetic field; a coil is provided for generating the electromagnetic field, the coil being disposed in the concavity of the ferromagnetic material; upon contact of the displaceable element at one of the two stops, a force acts on the displaceable element in the direction of the one of the two stops; the coil is enclosed toward the outside by the permanent magnets and the ferromagnetic material; and the displaceable element having a distal pole shoe and a proximal pole shoe to define a concavity on an exterior surface of the displaceable element, wherein an outside of the distal pole shoe and an outside of the proximal pole shoe serve as sliding surfaces for a sliding contact between the tube and the displaceable element; and the ferromagnetic material having first and second side walls and a bottom forming a concavity, the first and second side walls each extending in a flange along the longitudinal direction to form a distal flange and a proximal flange, wherein the distal flange opposes the distal pole shoe and the proximal flange opposes the proximal pole shoe for at least the portion of a range of motion of a distal and proximal pole shoes in the longitudinal direction.