Distal targeting of locking screws in intramedullary nails

Details Distal targeting of locking screws in intramedullary nails Distal targeting of locking screws in intramedullary nails

G - Physics

01

B

G01B 7/00 (2006.01) A61B 5/06 (2006.01) A61B 17/90 (2006.01) G01B 7/14 (2006.01) G01V 3/08 (2006.01) A61B 17/72 (2006.01)

Patent

CA 2640704

In a distal targeting system a hand-held location pad is integral with a guide sec-tion for a drill or similar surgical instrument, and has a plurality of magnetic field gen-erators. A sensor, such as a wireless sensor, having a plurality of field transponders, is disposed in an orthopedic appliance, such as an intramedullary nail. The sensor is capa-ble of detecting and discriminating the strength and direction of the different fields generated by the field generators. Control circuitry, preferably located in the location pad is responsive to a signal of the sensor, and determines the displacement and relative directions of an axis of the guide section, and a bore in the orthopedic appliance. A screen display and optional speaker in the location pad provide an operator- perceptible indication that enables the operator to adjust the position of the guide section so as to align its position and direction with the bore.

Dans un système de ciblage distal, un levier à main est intégré à un guide pour perceuse ou pour instrument chirurgical similaire; ce système comporte de nombreux générateurs de champs magnétiques. Une sonde, par exemple une sonde sans fil dotée de multiples transpondeurs, est intégrée à un appareil orthopédique, par exemple un clou centromédullaire. Cette sonde est en mesure de déceler et de différencier la puissance et la direction des différents champs produits par les générateurs de champs. Un circuit de commande, idéalement situé dans le levier de localisation, réagit aux signaux de la sonde et détermine la direction des déplacements par rapport à l'axe du guide et au canal de l'alésage de l'appareil orthopédique. L'écran et le haut- parleur facultatif du levier de localisation permettent à l'utilisateur de régler la position du guide afin de l'aligner en fonction de l'orientation du canal de l'alésage.

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