Mechano-acoustic sensing devices and methods
Various embodiments of the present technology include a soft, conformal class of device configured specifically for mechano-acoustic recording from the skin, capable of being used on nearly any part of the body, in forms that maximize detectable signals and allow for multimodal operation, such as electrophysiological recording. Some embodiments can be configured for use in cardiovascular diagnostics, implantable device diagnostics, and human-machine interfaces (HMIs). In some embodiments, a conformal sensing device for measuring mechano-acoustic recording from skin of a human subject can include a mechano-acoustic sensor, a wireless transmitter, a flexible housing, and/or one or more electrodes.
1. A conformal sensing device for measuring mechano-acoustic recording from skin of a human subject, the conformal sensing device comprising:
a mechano-acoustic sensor configured to record mechano-acoustic signals generated by a body of a human subject or mechanically active implant;
a wireless transmitter configured to transmit the mechano-acoustic signals to an external monitoring device; and
a flexible housing configured to encapsulate the mechano-acoustic sensor and wireless transmitter, the flexible housing comprising an elastomeric core between an upper flexible insulating layer and a lower flexible insulating layer, the elastomeric core having a lower modulus than the upper and lower flexible insulating layers,
wherein the flexible housing includes an affixation mechanism configured to allow conformal integration of the conformal sensing device with curvilinear regions of skin of the human subject.
2. The conformal sensing device of claim 1 , further comprising one or more electrodes.
3. The conformal sensing device of claim 1 , wherein the conformal sensing device has a mass less than five grams and a thickness less than ten millimeters.
4. The conformal sensing device of claim 1 , wherein the mechano-acoustic sensor is configured to detect mechano-acoustic signals between 0.01 hertz and ten-thousand hertz, or a limited spectrum of frequencies within 0.01 hertz and ten-thousand hertz.
5. The conformal sensing device of claim 1 , wherein the mechano-acoustic signals the mechano-acoustic sensor is configured to record include one or more of temperature, electrophysiological signals, measurement of skin stiffness, quasi-static or dynamic dimensional changes, or voice of the human subject.
6. The conformal sensing device of claim 1 , further comprising one or more filters, integrated into the conformal sensing device or located in the external monitoring device, to receive the mechano-acoustic signals from the mechano-acoustic sensor and create processed signals from the mechano-acoustic signals.
7. The conformal sensing device of claim 1 , wherein the mechano-acoustic sensor is configured to capture both electromyogram (EMG) signals from articulator muscle groups and acoustic vibrations from vocal cords or to capture electrocardiography (ECG) signals, phonocardiography (FOG) signals, seismocardiography (SCG) signals, or ballistocardiography (BCG) signals from heart activity and respiration.
8. The conformal sensing device of claim 7 , wherein the external monitoring device processes the electromyogram (EMG) signals from the articulator muscle groups and the acoustic vibrations from vocal cords to identify speech from the human subject.
9. The conformal sensing device of claim 1 , wherein the mechano-acoustic sensor is encapsulated within the elastomeric core.
10. The conformal sensing device of claim 1 , wherein the elastomeric core comprises an ultra-low modulus silicone, and
wherein the upper and lower flexible insulating layers comprise a low-modulus silicone.
11. The conformal sensing device of claim 10 , wherein the ultra-low modulus silicone comprises a Young's modulus E=5 kPa and wherein the low-modulus silicone comprises a Young's modulus E=60 kPa.
12. The conformal sensing device of claim 1 being substantially unaffected by ambient acoustic noise during operation due to the conformal integration with curvilinear regions of skin of the human subject.