Fixture for shape-sensing optical fiber in a kinematic chain
First Claim
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1. An apparatus comprising:
- a first link, the first link having first and second ends with a first channel extending between the first and second ends of the first link;
a second link, the second link having first and second ends with a second channel extending between the first and second ends;
a joint that couples the first and second links;
an optical fiber extending between the first link and the second link and through the first and second channels; and
a tube with a third channel, the tube positioned within the first channel, and the third channel having a lip with a curved surface, wherein the optical fiber extends beyond a distal end of the tube through the third channel beyond the lip into the joint and is bendable along the lip of the third channel.
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Abstract
Localized strain is effectively eliminated in a shape sensing optical fiber where the fiber exits a link in a kinematic chain. In one aspect, the fiber is positioned in a channel within a fiber fixture portion of the link, and a surface of a lip of the channel is curved. The curved surface of the lip begins tangent to a wall of the channel and has a maximum radius of curvature that is less than the minimum bend radius that the fiber will experience during shape sensing. In another aspect, the fiber is positioned within a shape memory alloy tube that extends from the link.
89 Citations
20 Claims
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1. An apparatus comprising:
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a first link, the first link having first and second ends with a first channel extending between the first and second ends of the first link; a second link, the second link having first and second ends with a second channel extending between the first and second ends; a joint that couples the first and second links; an optical fiber extending between the first link and the second link and through the first and second channels; and a tube with a third channel, the tube positioned within the first channel, and the third channel having a lip with a curved surface, wherein the optical fiber extends beyond a distal end of the tube through the third channel beyond the lip into the joint and is bendable along the lip of the third channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A minimally invasive surgical instrument comprising:
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an instrument shaft; an end effector; and a wrist mechanism coupled between the instrument shaft and the end effector, wherein the wrist mechanism includes a first link, the first link having first and second ends with a first channel extending between the first and second ends of the first link; a second link, the second link having first and second ends with a second channel extending between the first and second ends; a joint that couples the first and second links; an optical fiber extending between the first link and the second link; and a tube with a third channel, the tube positioned within the first channel, and the third channel having a lip with a curved surface, wherein the optical fiber extends through the third channel beyond the lip into the joint and is bendable along the lip of the third channel. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification