Planar Sensor Array for Wireless Implantable Marker Localization

The system segments the excitation and detection functions into separate physical components: an excitation source that transmits the strong excitation signal and a sensor array that detects the weak marker signal. This spatial segmentation allows the strong excitation signal to activate the marker while the separate sensor array detects the resulting weak marker signal without being overwhelmed by the excitation signal itself.

The patent introduces an intermediary detection system (sensor array with multiple sense signal output paths) that mediates between the excitation source and the marker signal detection. This intermediary system processes the electromagnetic field signals to extract the weak marker signal from the presence of the strong excitation signal, enabling accurate detection despite the power imbalance.

The patent transitions from traditional single-point or simple coil detection to a two-dimensional array of electromagnetic field sensors. This dimensional expansion creates multiple sense signal output paths that sample the electromagnetic field across a spatial plane, enabling more sophisticated signal processing and location determination through spatial analysis of the field distribution.

The system employs periodic or pulsed excitation signals to activate the wireless markers at specific time intervals. This periodic action creates time-gated detection opportunities where the marker signal can be distinguished from the excitation signal by detecting responses during specific phases of the excitation cycle, improving signal-to-noise ratio through temporal separation.