Smooth control of an articulated instrument across areas with different work space conditions
First Claim
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1. A medical robotic system comprising:
- an articulated instrument having a plurality of joints;
an input device; and
a controller configured to command actuation of the plurality of joints in response to manipulation of the input device subject to a virtual barrier constraint in which commanded translational movement of a joint of the plurality of joints from a current area in which the joint has current work space limits to a new area in which the joint has new work space limits is prevented until deployment of the joint satisfies the new work space limits, wherein the current and new work space limits are different in at least an allowable range of angular rotation of the joint.
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Abstract
An articulated instrument is controllably movable between areas of different work space limits, such as when it is extendable out of and retractable into a guide tube. To avoid abrupt transitions in joint actuations as the joint moves between areas of different work space limits, a controller limits error feedback used to control its movement. To provide smooth joint control as the instrument moves between areas of different work space limits, the controller imposes barrier and ratcheting constraints on each directly actuatable joint of the instrument when the joint is commanded to cross between areas of different work space limits.
224 Citations
20 Claims
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1. A medical robotic system comprising:
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an articulated instrument having a plurality of joints; an input device; and a controller configured to command actuation of the plurality of joints in response to manipulation of the input device subject to a virtual barrier constraint in which commanded translational movement of a joint of the plurality of joints from a current area in which the joint has current work space limits to a new area in which the joint has new work space limits is prevented until deployment of the joint satisfies the new work space limits, wherein the current and new work space limits are different in at least an allowable range of angular rotation of the joint. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling a plurality of joints of an articulated instrument, the method comprising:
commanding actuation of the plurality of joints in response to manipulation of an input device subject to a virtual barrier constraint in which commanded translational movement of a joint of the plurality of joints from a current area in which the joint has current work space limits to a new area in which the joint has new work space limits is prevented until deployment of the joint satisfies the new work space limits, wherein the current and new work space limits are different in at least an allowable range of angular rotation of the joint. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification