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Surgical optical zoom system

  • US 10,481,373 B2
  • Filed: 10/04/2018
  • Issued: 11/19/2019
  • Est. Priority Date: 10/06/2017
  • Status: Active Grant
First Claim
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1. A surgical microscope for capturing a high optical zoom image of a target during a surgical procedure, the surgical microscope comprising:

  • an optical assembly including at least one moveable optics;

    an actuator for positioning the moveable optics, the actuator including a pulley system for moving the optics along a set of rails;

    a sensor for detecting the position of the moveable optics;

    a controller for controlling the actuator in response to received control input; and

    a camera for capturing the image of the target from the optical assembly;

    wherein the controller is configured to;

    receive control input indicating a target position for the moveable optics;

    control the actuator to position the moveable optics towards the target position, the actuator being controlled according to a first set of control parameters;

    upon receiving signals from the sensor indicating that the moveable optics is within a threshold range of the target position, switch to a second set of control parameters for controlling the actuator; and

    control the actuator to maintain the moveable optics at the target position at steady state;

    the first and second sets of control parameters being, respectively, first and second sets of proportional (P), integral (I) and derivative (D) terms for dual-PID control of the actuator.

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