Robotically controlled catheter and method of its calibration
First Claim
1. A robotic surgical system, comprising:
- a servo mechanism adapted to be coupled to a medical device such that the servo mechanism can induce the medical device to oscillate on a first axis;
a positional feedback system adapted to output a first position signal representative of the position of at least one point on the medical device as the medical device oscillates on the first axis; and
a processor to process the first position signal into a transfer function that relates inputs by the servo mechanism to movements of the medical device coupled thereto.
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Accused Products
Abstract
A method of calibrating a robotic device, such as a cardiac catheter, includes oscillating the device on an actuation axis by applying an oscillation vector at an oscillation frequency. While oscillating, a location of the device is periodically measured to generate a plurality of location data points, which may express the location of the device relative to a plurality of measurement axes. The location data points are then processed using a signal processing algorithm, such as a Fourier transform algorithm, to derive a transfer function relating a position of the device to a movement vector for the actuation axis. The transfer function may be resolved into and expressed as a calibration vector for the actuation axis, which may include one or more components, including zero components, directed along each of the measurement axes. The process may be repeated for any actuation axes on which calibration is desired.
246 Citations
17 Claims
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1. A robotic surgical system, comprising:
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a servo mechanism adapted to be coupled to a medical device such that the servo mechanism can induce the medical device to oscillate on a first axis; a positional feedback system adapted to output a first position signal representative of the position of at least one point on the medical device as the medical device oscillates on the first axis; and a processor to process the first position signal into a transfer function that relates inputs by the servo mechanism to movements of the medical device coupled thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for calibrating a robotic surgical system including a servo mechanism operable to apply an oscillation vector to a medical device operably coupled thereto and a positional feedback system operable to output a position signal representative of a position of the medical device, the apparatus comprising:
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a position output processor configured to receive the position signal and generate a position output signal reflecting movement of the medical device attributable to the application of the oscillation vector; and a calibration processor configured to receive the position output signal and generate a transfer function that relates inputs to the servo mechanism to movements of the medical device operably coupled thereto. - View Dependent Claims (9, 10, 11)
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12. An apparatus for calibrating a robotic surgical system including a servo mechanism and a positional feedback system, the apparatus comprising:
a processor operably coupled to the robotic surgical system and configured to; energize the servo mechanism to apply an oscillation vector to a device coupled thereto; periodically measure a location of at least one point on the device while the oscillation vector is being applied to the device, thereby generating a position signal for the device; process the position signal to generate an output signal, wherein the output signal reflects movement of the device attributable to application of the oscillation vector to the device by the servo mechanism; and generate a transfer function from the output signal that relates inputs to the servo mechanism to resulting movements of the device. - View Dependent Claims (13, 14, 15, 16, 17)
Specification