Instrument force sensor using strain gauges in a faraday cage

    公开(公告)号:US10786321B2

    公开(公告)日:2020-09-29

    申请号:US16072140

    申请日:2017-01-31

    Abstract: A surgical instrument includes a force sensor apparatus that is immune to noise from arcing cautery without relying on fiber optic strain gauges, and that is autoclabable. The surgical instrument includes a housing, a shaft, the force sensor apparatus, a joint, and an end component. The force sensor apparatus includes at least one strain gauge that is enclosed in a Faraday cage. The Faraday cage includes a sensor capsule that includes one or more strain gauges, a cable shield tube connected to the sensor capsule, and an electronics enclosure connected to the cable shield tube. The sensor capsule is positioned between the joint and the shaft. The cable shield tube extends through the shaft to the electronics enclosure that is within the housing.

    REDUCTION OF ENDOSCOPE HIGH FREQUENCY LEAKAGE CURRENT USING A COMMON-MODE CHOKE

    公开(公告)号:US20190029499A1

    公开(公告)日:2019-01-31

    申请号:US16072115

    申请日:2017-01-31

    Abstract: An endoscope includes a body and a circuit board mounted within the body. A cable couples the circuit board to an imaging system. A common-mode choke is mounted within the body and is configured to electrically isolate the cable from the body at cautery frequencies. A method includes twisting a plurality of wires together to form a twisted set of wires. The twisted set of wires is wound around a core so that windings do not overlap, and so that a first winding and a last winding are separated from each other. Wires in the twisted set of wires are coupled to a plurality of wires in the cable. Also, these wires in the twisted set of wires are also coupled to the circuit board.

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