Friction compensation in a minimally invasive surgical apparatus
First Claim
1. A surgical apparatus having at least one master control operatively associated with at least one surgical instrument by means of a control system, the master control and its associated surgical instrument including a plurality of components at least some of which are selectively moveable in positive component directions and negative component directions, and one of which has an actuator operatively associated therewith, the control system being arranged to cause the surgical instrument to perform movements in response to master control movements so as to perform at least part of a surgical procedure, the surgical apparatus further including a friction compensation system includinga generator for generating a friction compensation signal defining a load to be supplied to the actuator to compensate for friction experienced by the component associated with the actuator, and a sensor operatively associated with the component so as to obtain a component velocity reading of that component.
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Accused Products
Abstract
Devices, systems, and methods for compensate for friction within powered automatic systems, particularly for telesurgery and other telepresence applications. Dynamic friction compensation may comprise applying a continuous load in the direction of movement of a joint, and static friction compensation may comprise applying alternating loads in positive and negative joint actuation directions whenever the joint velocity reading falls within a low velocity range.
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Citations
31 Claims
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1. A surgical apparatus having at least one master control operatively associated with at least one surgical instrument by means of a control system, the master control and its associated surgical instrument including a plurality of components at least some of which are selectively moveable in positive component directions and negative component directions, and one of which has an actuator operatively associated therewith, the control system being arranged to cause the surgical instrument to perform movements in response to master control movements so as to perform at least part of a surgical procedure, the surgical apparatus further including a friction compensation system including
a generator for generating a friction compensation signal defining a load to be supplied to the actuator to compensate for friction experienced by the component associated with the actuator, and a sensor operatively associated with the component so as to obtain a component velocity reading of that component.
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21. A surgical apparatus having at least one master control operatively associated with at least one surgical instrument by means of a control system, the master control and its associated surgical instrument including a plurality of components at least some of which are selectively moveable in positive component directions and negative component directions, and one of which has an actuator operatively associated therewith, the control system being arranged to cause the surgical Instrument to perform movements in response to master control movements so as to perform at least part of a surgical procedure, the surgical apparatus further including a friction compensation system including
a generator for generating a friction compensation signal defining a load to be supplied to the actuator to compensate for friction experienced by the component associated with the actuator, wherein the generator is arranged to generate a duty cycle signal having a distribution extending between a positive duty cycle magnitude corresponding to a friction compensation force to be applied in the positive component direction and a negative duty cycle magnitude corresponding to a friction compensation force to be applied in the negative component direction.
Specification