| 摘要 |
An emitter may be disposed in a patient. Output from the emitter may be detected by a detector connected with the guide rod and by a detector connected with the tracheal tube. Alternatively, a detector may detect the output from an emitter connected with the guide rod and by an emitter connected with the tracheal tube. Emitter units may be ultrasonic transducers and emit ultrasonic energy. The detector may respond to ultrasonic energy.
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