Force sensor temperature compensation
First Claim
1. A force sensor apparatus, comprising:
- a tube portion including an outer surface, a plurality of radial ribs, and at least one fiber optic strain gauge positioned on the outer surface over each rib of the plurality of radial ribs, wherein the strain gauges are comprised of a negative thermo-optic coefficient optical fiber material;
a proximal end of the tube portion being configured to operably couple to a shaft of a surgical instrument, the shaft being configured to operably couple to a manipulator arm of a robotic surgical system; and
a distal end of the tube portion being configured to operably couple to a proximal end of a wrist joint so that the force sensor apparatus is positioned between the shaft and the wrist joint, and the wrist being configured to operably couple to an end effector.
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0 Petitions
Accused Products
Abstract
In one embodiment, a force sensor apparatus is provided including a tube portion having a plurality of radial ribs and at least one fiber optic strain gauge positioned over each rib of the plurality of radial ribs. The strain gauges are comprised of a negative thermo-optic coefficient optical fiber material in one embodiment. A proximal end of the tube portion is operably couplable to a shaft of a surgical instrument that is operably couplable to a manipulator arm of a robotic surgical system, and a distal end of the tube portion is proximally couplable to a wrist joint coupled to an end effector. In another embodiment, 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. In yet another embodiment, a thermal shunt shell is over an outer surface of the tube portion. An advantageous surgical instrument having improved temperature compensation is also provided.
146 Citations
15 Claims
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1. A force sensor apparatus, comprising:
- a tube portion including an outer surface, a plurality of radial ribs, and at least one fiber optic strain gauge positioned on the outer surface over each rib of the plurality of radial ribs, wherein the strain gauges are comprised of a negative thermo-optic coefficient optical fiber material;
a proximal end of the tube portion being configured to operably couple to a shaft of a surgical instrument, the shaft being configured to operably couple to a manipulator arm of a robotic surgical system; and
a distal end of the tube portion being configured to operably couple to a proximal end of a wrist joint so that the force sensor apparatus is positioned between the shaft and the wrist joint, and the wrist being configured to operably couple to an end effector. - View Dependent Claims (2, 3, 4, 5, 6)
- a tube portion including an outer surface, a plurality of radial ribs, and at least one fiber optic strain gauge positioned on the outer surface over each rib of the plurality of radial ribs, wherein the strain gauges are comprised of a negative thermo-optic coefficient optical fiber material;
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7. A force sensor apparatus, comprising:
- a tube portion including an outer surface, a plurality of radial ribs, and at least one pair of adjacent fiber optic strain gauges, each fiber optic strain gauge in the at least one pair being positioned on the outer surface over a rib of the plurality of radial ribs;
a proximal end of the tube portion being configured to operably couple to a shaft of a surgical instrument, the shaft being configured to operably couple to a manipulator arm of a robotic surgical system; and
a distal end of the tube portion being configured to operably couple to a proximal end of a wrist joint so that the force sensor apparatus is positioned between the shaft and the wrist joint, and the wrist being configured to operably couple to an end effector. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
- a tube portion including an outer surface, a plurality of radial ribs, and at least one pair of adjacent fiber optic strain gauges, each fiber optic strain gauge in the at least one pair being positioned on the outer surface over a rib of the plurality of radial ribs;
Specification