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Frameless stereotaxy system

  • US 5,309,913 A
  • Filed: 11/30/1992
  • Issued: 05/10/1994
  • Est. Priority Date: 11/30/1992
  • Status: Expired due to Term
First Claim
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1. A stereotaxy system comprising:

  • a subject support;

    a means for securing a preselected portion of a subject to the subject support;

    a frame assembly which mounts at least three receivers in a fixed relationship to the subject support closely adjacent the means for securing a portion of the subject to the subject support;

    at least one reference emitter mounted a fixed, known distance from the receivers, the reference emitter emitting a reference signal which travels from the reference emitter the fixed distance to the receivers;

    a calibration means for measuring a reference travel time of the reference signal over the preselected distance and generating a corresponding calibration factor;

    a wand having a pointer and at least two emitters mounted thereto, the two wand emitters selectively emitting wand signals which are received by the at least three receivers;

    a wand position determining means for determining a position of the wand pointer by measuring wand signal travel times of the wand signals between the two wand emitters and the at least three receivers, the wand position determining means being connected with the calibration means for calibrating the wand signal travel times with the reference travel time.

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