Medical device for determining the position of intracorporeal implants
AssigneeWittenstein AG
InventorsRoman Stauch, Miroslaw Wrobel
Life of this patent
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Abstract
Magnetically locatable implants, such as fixation systems, anchor plates or the like, and the determination of their intracorporeal position by means of a medical device comprising at least one impedance-measuring device and a device for generating and coupling a magnetic field which are both connected to at least one intracorporeal electrically conductive probe, the impedance-measuring device being additionally equipped with at least one connector for connection to the magnetically locatable implant. The device is particularly suitable for determining the position of magnetically locatable pedicle screws and the like in a spinal column fixation system with rod-shaped electrically conductive probes as stabilizers.
Claims14
Surgical implants made of plastic and/or ceramic wherein the implants include means for magnetically locating the implants.
Medical device for determining the position of intracorporeal implants comprises at least one impedance-measuring device (16) and a device for generating and coupling a magnetic field (13) which are both connected to at least one intracorporeal probe (12), the impedance-measuring device (16) being additionally equipped with at least one connector (19) for connection to the conductive part of the implant (5).
Medical device for determining the position of magnetically locatable pedicle screws in a spinal column fixation system with rod-shaped probes as stabilizers comprises an intracorporeal electrically conductive probe (12) connected to an impedance-measuring device (16) and to a device for generating and coupling a magnetic field (13), and an additional connector (19) of the impedance-measuring device (16) is electrically conductively connected to respective magnetically locatable pedicle screws.
Method for determining the position of intracorporeal magnetically locatable implants with the aid of a device comprising at least one impedance-measuring device (16) and a device for generating and coupling a magnetic field (13) which are both connected to at least one intracorporeal probe (12), the impedance-measuring device (16) additionally being equipped with at least one connector (19) for connection to the magnetically locatable implant (5), comprising the steps of first using the probe (12), upon introduction into the body, to carry out a rough determination of position by means of the impedance-measuring device (16) measuring the phase displacement between current and voltage as a function of the distance between the probe (12) and the magnetically locatable implant (5), whereas, shortly before the magnetically locatable implant (5) is reached by the probe (12), a precise determination of position takes place with the aid of the device for generating and coupling a magnetic field (13).
Dependencies are inferred from the claim text.