Which of the following is NOT a type of lesion pattern used with the Simplicity device?

The correct answer indicates that a monopolar lesion at the base electrode is not recognized as a type of lesion pattern utilized with the Simplicity device. In the context of the Simplicity device, lesion patterns are typically categorized into bipolar and monopolar configurations, where each has distinct placement of electrodes serving specific functional purposes.

Bipolar lesions involve two electrodes working together to produce a lesion in a certain area, often allowing for more targeted energy delivery. Monopolar lesions, on the other hand, utilize one active electrode while a grounding reference, or return electrode, is elsewhere, which can result in broader lesions. In this case, the configurations involving bipolar lesions are valid and widely used within the device's functionality.

The case of a monopolar lesion at the base electrode does not align with standard practices or established patterns within the device. Therefore, it's deemed as not fitting into the recognized lesion types for the Simplicity device, which is why it’s appropriate to identify it as the correct answer. This distinction highlights the specialized application of different electrode placements and energy delivery methods in creating lesions for medical procedures.