System and method for breakaway clutching in an articulated arm
First Claim
1. A computer-assisted medical device, the device comprising:
- an articulated arm comprising a first joint; and
a control unit coupled to the articulated arm and comprising one or more processors;
wherein the control unit;
operates the first joint in a locked state, in which movement is restricted, and a float state, in which movement is permitted;
switches the first joint from the locked state to the float state when a stimulus on the first joint exceeds a first unlock threshold;
switches the first joint from the float state to the locked state when a velocity of the first joint is below a first lock threshold; and
on the condition that the first joint is in the float state, commands the first joint to move to a commanded position based on a current actual position of the first joint, or to a commanded velocity based on a current actual velocity of the first joint.
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Abstract
A system and method of breakaway clutching in a computer-assisted medical device includes an articulated arm having one or more first joints and a control unit coupled to the articulated arm and having one or more processors. The control unit operates each of the first joints in multiple states. The multiple states include a locked state, wherein movement of respective first joints is restricted, and a float state, wherein movement of the respective first joints is permitted. The control unit further switches one or more second joints selected from the first joints from the locked state to the float state when a stimulus on the second joints exceeds one or more unlock thresholds and switches the second joints from the float state to the locked state when a velocity of each of the second joints is below one or more lock thresholds.
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Citations
23 Claims
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1. A computer-assisted medical device, the device comprising:
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an articulated arm comprising a first joint; and a control unit coupled to the articulated arm and comprising one or more processors; wherein the control unit; operates the first joint in a locked state, in which movement is restricted, and a float state, in which movement is permitted; switches the first joint from the locked state to the float state when a stimulus on the first joint exceeds a first unlock threshold; switches the first joint from the float state to the locked state when a velocity of the first joint is below a first lock threshold; and on the condition that the first joint is in the float state, commands the first joint to move to a commanded position based on a current actual position of the first joint, or to a commanded velocity based on a current actual velocity of the first joint. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of controlling motion in a medical device, the method comprising:
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operating a first joint of an articulated arm of the medical device in a locked state, in which movement of the first joint is restricted, and a float state, in which movement of the first joint is permitted; determining a stimulus on the first joint; switching the first joint from the locked state to the float state when the stimulus exceeds a first unlock threshold; determining a velocity of the first joint; switching the first joint from the float state to the locked state when the velocity of the first joint is below a first lock threshold; and on condition that the first joint is in the float state, commanding the first joint to move to a commanded position based on a current actual position of the first joint, or to a commanded velocity based on a current actual velocity of the first joint. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification