Force sensor temperature compensation
First Claim
1. A surgical instrument, comprising:
- a housing portion that interfaces with a manipulator arm of a robotic surgical system;
a wrist joint;
a tubular shaft comprising a proximal end, a distal end, a lengthwise axis, a lengthwise outer surface extending from the proximal end to the distal end, and a distal portion of the tubular shaft including the distal end, the lengthwise axis extending from the proximal end to the distal end, the proximal end of the tubular shaft being operably coupled to the housing portion, the distal end of the tubular shaft being operably coupled to the wrist joint, the distal portion including a plurality of radial ribs, each of the plurality of radial ribs extending along the lengthwise axis of the tubular shaft, the plurality of radial ribs forming through-passages within the tubular shaft;
a plurality of strain gauges, each strain gauge of the plurality of strain gauges being mounted on the lengthwise outer surface of the distal portion of the tubular shaft and each of the plurality of strain gauges being positioned over a different one of the plurality of radial ribs;
one or more cables extending from the housing portion through at least one of the through-passages to the wrist joint; and
an end effector operably coupled to the wrist joint.
3 Assignments
0 Petitions
Accused Products
Abstract
A force sensor apparatus includes a tube portion having a plurality of radial ribs and at least one fiber optic strain gauge positioned over each of the plurality of radial ribs. The strain gauges comprise a negative thermo-optic coefficient optical fiber material. A proximal end of the tube portion is operably couplable to a shaft of a surgical instrument and a distal end of the tube portion is proximally couplable to a wrist joint. Optionally, a thermal shunt shell is over an outer surface of the tube portion. Adjacent fiber optic strain gauges with differing thermal responses are used to solve simultaneous equations in strain and temperature to derive strain while rejecting thermal effects.
141 Citations
13 Claims
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1. A surgical instrument, comprising:
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a housing portion that interfaces with a manipulator arm of a robotic surgical system; a wrist joint; a tubular shaft comprising a proximal end, a distal end, a lengthwise axis, a lengthwise outer surface extending from the proximal end to the distal end, and a distal portion of the tubular shaft including the distal end, the lengthwise axis extending from the proximal end to the distal end, the proximal end of the tubular shaft being operably coupled to the housing portion, the distal end of the tubular shaft being operably coupled to the wrist joint, the distal portion including a plurality of radial ribs, each of the plurality of radial ribs extending along the lengthwise axis of the tubular shaft, the plurality of radial ribs forming through-passages within the tubular shaft; a plurality of strain gauges, each strain gauge of the plurality of strain gauges being mounted on the lengthwise outer surface of the distal portion of the tubular shaft and each of the plurality of strain gauges being positioned over a different one of the plurality of radial ribs; one or more cables extending from the housing portion through at least one of the through-passages to the wrist joint; and an end effector operably coupled to the wrist joint. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification