| CPC G06F 3/015 (2013.01) [A61B 5/296 (2021.01); A61B 5/313 (2021.01); A61B 5/395 (2021.01); A61B 5/7203 (2013.01); G06F 1/163 (2013.01); G06F 3/014 (2013.01)] | 20 Claims |
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1. An arm-wearable device for sensing neuromuscular signals using a shared reference electrode that is shared between two or more electrodes, the arm-wearable device comprising:
a wearable structure configured to be worn by a user, the wearable structure having an interior surface and an exterior surface, the interior surface being configured to contact a user's skin when the arm-wearable device is donned by the user;
a first electrode at a first portion of the interior surface for detecting neuromuscular signals;
a second electrode at a second portion, distinct from the first portion, of the interior surface for detecting neuromuscular signals;
a shared reference electrode aligned at a third portion, distinct from the first and second portions, of the interior surface for detecting a reference neuromuscular signal that is compared to respective neuromuscular signals detected by the first electrode and the second electrode;
a ground electrode at a fourth portion of the interior surface distinct from the first, second, and/or third portions, wherein the ground electrode is distinct from the shared reference electrode,
wherein:
a portion of each electrode of the first electrode, the second electrode, and the shared reference electrode contacts the user's skin above respective neuromuscular pathways of the user when the wearable structure is worn by the user, and
the first electrode and the second electrode each form a respective sensing channel when used in conjunction with the shared reference electrode; and
circuitry configured to compare (i) the respective neuromuscular signals detected by the first electrode to the reference neuromuscular signal such that the first electrode and the shared reference electrode are operated as a first sensing channel and (ii) the respective neuromuscular signals detected by the second electrode to the reference neuromuscular signal such that the second electrode and the shared reference electrode are operated as a second sensing channel to allow for a determination by one or more processors of the arm-wearable device of a motor action that the user intends to perform with their hand.
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