Closing system for a passage for instruments
First Claim
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1. A closing system for an instrument passage comprising a conical seat at one end of the passage;
- a ferromagnetic closing member being fitted into the conical seat, the closing member being floatingly seated in the conical seat, the closing member having a circumferential portion;
a magnet being arranged so that an area of strongest magnetic force of the magnet is directed at a section of the circumferential portion of the closing member for providing an asymmetric magnetic force, whereby the section of the circumferential portion of the closing member at which the magnet is directed remains seated in the conical seat when the closing member is moved for opening the passage; and
a ferromagnetic flux directing member being arranged adjacent the magnet, the flux directing member having an annular segment portion arranged in diametral opposition to the area of strongest magnetic force of the magnet, thereby forming a magnetic circuit having the magnet as one pole and the annular segment portion of the flux directing member as another pole, the closing member operating to close the magnetic circuit, the flux directing member operating to provide for magnetic feedback in the circumferential portion of the closing member so that the closing member is most stable when in a closed position.
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Abstract
A closing system for an instrument passage, particularly for use in laparoscopic puncture devices. The object of the invention is to provide a closing system of safe operation which permits a non-complicated cleaning and has a simple and comparatively small construction. The object is realized according to the invention in that a closing member is a floatingly seated disc which centrally fits into a conical seat and which is held in any position only by a non-symmetrically acting magnetic force of at least one magnet, preferably a permanent magnet.
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11 Claims
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1. A closing system for an instrument passage comprising a conical seat at one end of the passage;
- a ferromagnetic closing member being fitted into the conical seat, the closing member being floatingly seated in the conical seat, the closing member having a circumferential portion;
a magnet being arranged so that an area of strongest magnetic force of the magnet is directed at a section of the circumferential portion of the closing member for providing an asymmetric magnetic force, whereby the section of the circumferential portion of the closing member at which the magnet is directed remains seated in the conical seat when the closing member is moved for opening the passage; and
a ferromagnetic flux directing member being arranged adjacent the magnet, the flux directing member having an annular segment portion arranged in diametral opposition to the area of strongest magnetic force of the magnet, thereby forming a magnetic circuit having the magnet as one pole and the annular segment portion of the flux directing member as another pole, the closing member operating to close the magnetic circuit, the flux directing member operating to provide for magnetic feedback in the circumferential portion of the closing member so that the closing member is most stable when in a closed position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- a ferromagnetic closing member being fitted into the conical seat, the closing member being floatingly seated in the conical seat, the closing member having a circumferential portion;
Specification