Patent ID: 11965789
Assignee: INTUITIVE SURGICAL OPERATIONS, INC.
Field: Measurement (Instruments)
Classification: CPC G  A | IPC A  G

Claim 8:
9. A force sensor comprising:
a beam including a proximal end portion, a distal end portion, and a first face between the proximal end portion of the beam and the distal end portion of the beam;
a first bridge circuit on the first face of the beam;
a second bridge circuit on the first face of the beam;
a first measurement signal lead line;
a second measurement signal lead line;
a third measurement signal lead line; and
a fourth measurement signal lead line;
wherein the first bridge circuit includes a first tension strain gauge resistor, a second tension strain gauge resistor, a first compression strain gauge resistor, and a second compression strain gauge resistor;
wherein the second bridge circuit includes a third tension strain gauge resistor, a fourth tension strain gauge resistor, a third compression strain gauge resistor, and a fourth compression strain gauge resistor;
wherein the first tension strain gauge resistor, the first compression strain gauge resistor, the third tension strain gauge resistor, and the third compression strain gauge resistor are located at the proximal end portion of the beam;
wherein the second tension strain gauge resistor, the second compression strain gauge resistor, the fourth tension strain gauge resistor, and the fourth compression strain gauge resistor are located at the distal end portion of the beam;
wherein the first measurement signal lead line is mechanically isolated from the beam;
wherein the first measurement signal lead line electrically couples the first compression strain gauge resistor and the second compression strain gauge resistor;
wherein the second measurement signal lead line is mechanically isolated from the beam;
wherein the second measurement signal lead line electrically couples the first tension strain gauge resistor and the second tension strain gauge resistor;
wherein the third measurement signal lead line is mechanically isolated from the beam;
wherein the third measurement signal lead line electrically couples the third compression strain gauge resistor and the fourth compression strain gauge resistor;
wherein the fourth measurement signal lead line is mechanically isolated from the beam; and
wherein the fourth measurement signal lead line electrically couples the third tension strain gauge resistor and the fourth tension strain gauge resistor.