System and method for mapping activity in peripheral nerves
Systems and methods are provided for controlling an entity in response to activity in a peripheral nerve comprising a plurality of fascicles. A multicontact electrode assembly is configured to record activity from the peripheral nerve. A processing component includes a sensor mapping component configured to quantify activity associated with a proper subset of the plurality of fascicles, an evaluation component configured to determine an adjustment of the status of the controlled entity from the quantified activity of the proper subset of the plurality of fascicles, and a controller configured to provide a control signal, representing the adjustment of the status of the controlled entity, to the controlled entity.
1. A method comprising:
for each of a plurality of contacts of a multicontact electrode assembly:
stimulating a test model of a peripheral nerve with a known voltage at a position associated with the contact; and
recording induced voltages at each of a plurality of pixels within the test model of the peripheral nerve due to stimulating the position with the known voltage as an m×1 vector, where m is a number of the plurality of pixels;
generating a sensitivity matrix from each of the m×1 vectors for each of the plurality of contacts, wherein the sensitivity matrix represents the spatial sensitivity of the multicontact electrode assembly, wherein n is a number of the plurality of contacts;
for each of the plurality of pixels:
determining a set of weights for the plurality of contacts of the multicontact electrode assembly based on the sensitivity matrix; and
providing a n×1 vector for the set of weights; and
concatenating the n×1 vectors for each of the plurality of pixels into a transformation matrix for the multicontact electrode assembly.
2. The method of claim 1 , wherein determining the set of weights comprises calculating the set of weights in a linear least squares optimization to minimize a deviation of a product of the sensitivity matrix and the n×1 vector for the set of weights from a delta function.
3. The method of claim 1 , wherein a product of the transformation matrix and a set of clinical voltages measured at the multicontact electrode assembly provides an expected spatial distribution of voltage across each position associated with the plurality of contacts.
4. The method of claim 1 , wherein the test model of the peripheral nerve comprises a homogenous epineurium immersed in saline.