Surgical optical zoom system
First Claim
Patent Images
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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Abstract
Methods and systems for controlling a surgical microscope. Moveable optics of the surgical microscope are controlled using two sets of control parameters, to reduce jitter and image instability. Shifts in the image due to changes in temperature or due to the use of optical filter can also be compensated. Misalignment between the mechanical axis and the optical axis of the surgical microscope can also be corrected.
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Citations
11 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 11)
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7. A method for controlling a surgical microscope for capturing a high optical zoom image, the method comprising:
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receiving control input indicating a target position for a moveable optics of the surgical microscope; controlling an actuator of the moveable optics to position the moveable optics towards the target position, the actuator being controlled according to a first set of control parameters, the actuator including a pulley system for moving the optics along a set of rails; upon receiving signals from a position sensor indicating that the moveable optics is within a threshold range of the target position, switching to a second set of control parameters for controlling the actuator; and controlling 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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Specification