Verb Surgical Inc.

Edgar Ignacio Ergueta Tejerina

Alireza Hariri

A surgical robotic tool used with a surgical robotic system can include cables that effect movement in the surgical robotic tool. A brake in any of these cables can be detected by checking a plurality of conditions. A process can compare a) a tension error against a first threshold, b) a rate of change of the sensed tension of the cable against a second threshold, and c) a rate of change of a cable extension error against a third threshold. If all thresholds are exceeded, the process can disable the respective actuator.

Detecting cable breakage on cable driven tools

Disclosed are systems and methods for limiting the grip force generated by closing robotic wrist jaws while operating in position mode in which the jaws are commanded to a desired jaw angle prior to being commanded to generate a grip force. In the positional mode, the desired jaw angle is above a threshold that corresponds to an angle at which both jaws are just simultaneously in contact with an object between the jaws or, if there is no object to grasp, when the jaws begin to touch each other. A feedback loop may analyze the desired jaw angle and the measured grip force to determine if the jaws are closing in the position mode and if the measured grip force exceeds a maximum grip force threshold. If so, the feedback loop may calculate a grip force error to limit the measured grip force to the maximum grip force threshold.

Systems and methods for limiting grip force of closing jaws in position control mode

Disclosed are systems and methods for achieving a smooth transition in the grip force when the wrist jaws transition between the position and force mode. In the position mode, the desired jaw angle is above a threshold corresponding to an angle at which both jaws are just simultaneously in contact with an object held between the jaws or, if there is no object, when the jaws begin to touch each other. A feedback loop may determine that the jaws are transitioning between the modes based on changes of the desired jaw angle. The feedback loop may analyze the commanded grip force and the measured grip force to determine whether to adjust the commanded grip force during the transition. If so, the feedback loop may adjust the commanded grip force to reduce changes in the measured grip force that is otherwise based on the desired jaw angle.

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San Jose, CA, United States of America

Edgar Ignacio Ergueta Tejerina