# US 2025/0375166 A1 · Filtering a physiological signal using a pressure sensor signal to generate a physiological measurement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0375166 A1 - Document ID: US20250375166A1 - Status: Published application - Kind: A1 - Application number: 19/234,248 - Filed: 2025-06-10 - Published: 2025-12-11 - Earliest claimed: 2024-06-10 - Assignees: Meta Platforms Technologies, LLC - Applicants: Meta Platforms Technologies, LLC - Inventors: Peter Twiss; Darien Niamir; Ravi Krishna Shaga - Web page: https://patentgrep.com/patent/US20250375166A1 ## CPC - A61B 5/725: {using specific filters therefor, e.g. Kalman or adaptive filters (specific diagnostics methods using using bioelectric or biomagnetic signals A61B5/316)} - A61B 5/681: {Wristwatch-type devices} - A61B 5/6885: {Monitoring or controlling sensor contact pressure} - A61B 5/721: {using a separate sensor to detect motion or using motion information derived from signals other than the physiological signal to be measured} - A61B 5/742: {using visual displays (displays for heart-related electrical signals, e.g. ECG, A61B5/339)} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A method of generating a motion-artifact compensated physiological signal is described. The method includes receiving a contact pressure signal from a pressure sensor coupled to a circuit board within a capsule of a wrist-wearable device donned by a user and receiving a physiological signal from a physiological sensor coupled to the circuit board. The method further includes in accordance with a determination, based on the contact pressure signal, that a first motion-artifact criteria is satisfied, determining, based on the contact pressure signal, first motion-artifact adjustments to the physiological signal, and generating, based on the first motion-artifact adjustments, a first motion-artifact compensated physiological signal. The method further includes determining a physiological measurement based on the first motion-artifact compensated physiological signal. ## Claims ### Claim 1 A method comprising: receiving a contact pressure signal from a pressure sensor coupled to a circuit board within a capsule of a wrist-wearable device donned by a user; receiving a physiological signal from a physiological sensor coupled to the circuit board; and in accordance with a determination, based on the contact pressure signal, that a first motion-artifact criteria is satisfied: determining, based on the contact pressure signal, first motion-artifact adjustments to the physiological signal, and p2 generating, based on the first motion-artifact adjustments, a first motion-artifact compensated physiological signal; in accordance with a determination, based on the contact pressure signal, that second motion artifact criteria is satisfied: determining, based on the contact pressure signal, second motion-artifact adjustments to the physiological signal, and generating, based on the first motion-artifact adjustments, a second motion-artifact compensated physiological signal; and determining a physiological measurement based on the first motion-artifact compensated physiological signal or the second motion-artifact compensated physiological signal. ### Claim 2 (depends on 1) The method of claim 1, wherein: determining, based on the contact pressure signal, the first motion-artifact adjustments includes determining first weights of an adaptive filter used to filter the physiological signal; and determining, based on the contact pressure signal, the second motion-artifact adjustments includes determining second weights of the adaptive filter used to filter the physiological signal. ### Claim 3 (depends on 1) The method of claim 1, wherein: the pressure sensor is a strain sensor; and the strain sensor is coupled to or disposed on one or more of: a band of the wrist-wearable device, the circuit board, a back cover of the capsule, and a side portion of the capsule. ### Claim 4 (depends on 3) The method of claim 3, wherein: the strain sensor is coupled to the circuit board and the contact pressure signal is generated by the strain sensor measuring a strain applied to the circuit board. ### Claim 5 (depends on 1) The method of claim 1, wherein: the pressure sensor is one of a plurality of pressure sensors coupled to the circuit board; each pressure sensor of the plurality of pressure sensors provides a respective contact pressure signals; and respective motion-artifact adjustments to the physiological signal are determined based on the respective contact pressure signals. ### Claim 6 (depends on 1) The method of claim 1, further comprising: receiving inertial measurement unit (IMU) data from an IMU of the wrist-wearable device; and wherein respective motion-artifact adjustments to the physiological signal are further determined based on the IMU data. ### Claim 7 (depends on 1) The method of claim 1, wherein the contact pressure signal is representative of a band tightness of the wrist-wearable device when donned by the user. ### Claim 8 (depends on 7) The method of claim 7, further comprising: in accordance with a determination that the band tightness of the wrist-wearable device satisfies a predetermined tightness threshold, causing an indication to be presented at the wrist-wearable device, the indication recommending an adjustment to a band of the wrist-wearable device. ### Claim 9 (depends on 1) The method of claim 1, further including: in accordance with a determination that the physiological measurement is outside of a predetermined threshold, generating an indication displayed at the wrist-wearable device to adjust a wrist-wearable device band tightness. ### Claim 10 A non-transitory, computer-readable storage medium including executable instructions that, when executed by one or more processors, cause the one or more processors to perform or cause performance of: receiving a contact pressure signal from a pressure sensor coupled to a circuit board within a capsule of a wrist-wearable device donned by a user; receiving a physiological signal from a physiological sensor coupled to the circuit board; and in accordance with a determination, based on the contact pressure signal, that first motion artifact criteria is satisfied: determining, based on the contact pressure signal, first motion-artifact adjustments to the physiological signal, and generating, based on the first motion-artifact adjustments, a first motion-artifact compensated physiological signal; in accordance with a determination, based on the contact pressure signal, that second motion artifact criteria is satisfied: determining, based on the contact pressure signal, second motion-artifact adjustments to the physiological signal, and generating, based on the first motion-artifact adjustments, a second motion-artifact compensated physiological signal; and determining a physiological measurement based on the first motion-artifact compensated physiological signal or the second motion-artifact compensated physiological signal. ### Claim 11 (depends on 10) The non-transitory, computer-readable storage medium of claim 10, wherein: determining, based on the contact pressure signal, the first motion-artifact adjustments includes determining first weights of an adaptive filter used to filter the physiological signal; and determining, based on the contact pressure signal, the second motion-artifact adjustments includes determining second weights of the adaptive filter used to filter the physiological signal. ### Claim 12 (depends on 10) The non-transitory, computer-readable storage medium of claim 10, wherein: the pressure sensor is a strain sensor; and the strain sensor is coupled to or disposed on one or more of: a band of the wrist-wearable device, the circuit board, a back cover of the capsule, and a side portion of the capsule. ### Claim 13 (depends on 12) The non-transitory, computer-readable storage medium of claim 12, wherein: the strain sensor is coupled to the circuit board and the contact pressure signal is generated by the strain sensor measuring a strain applied to the circuit board. ### Claim 14 (depends on 10) The non-transitory, computer-readable storage medium of claim 10, wherein: the pressure sensor is one of a plurality of pressure sensors coupled to the circuit board; each pressure sensor of the plurality of pressure sensors provides a respective contact pressure signals; and respective motion-artifact adjustments to the physiological signal are determined based on the respective contact pressure signals. ### Claim 15 A wrist-wearable device comprising: a capsule including a backplate portion configured to couple to a wrist of a user; a circuit board within the capsule of the wrist-wearable device; and one or more processors including one or more programs, the one or more programs comprising instructions, which, when executed by the wrist-wearable device, cause the wrist-wearable device to: receive a contact pressure signal from a pressure sensor coupled to the circuit board; receive a physiological signal from a physiological sensor coupled to the circuit board; and in accordance with a determination, based on the contact pressure signal, that first motion artifact criteria is satisfied: determine, based on the contact pressure signal, first motion-artifact adjustments to the physiological signal, and generate, based on the first motion-artifact adjustments, a first motion-artifact compensated physiological signal; in accordance with a determination, based on the contact pressure signal, that second motion artifact criteria is satisfied: determine, based on the contact pressure signal, second motion-artifact adjustments to the physiological signal, and generate, based on the first motion-artifact adjustments, a second motion-artifact compensated physiological signal; and determine a physiological measurement based on the first motion-artifact compensated physiological signal or the second motion-artifact compensated physiological signal. ### Claim 16 (depends on 15) The wrist-wearable device of claim 15, wherein: determining, based on the contact pressure signal, the first motion-artifact adjustments includes determining first weights of an adaptive filter used to filter the physiological signal; and determining, based on the contact pressure signal, the second motion-artifact adjustments includes determining second weights of the adaptive filter used to filter the physiological signal. ### Claim 17 (depends on 15) The wrist-wearable device of claim 15, wherein: the pressure sensor is a strain sensor; and the strain sensor is coupled to or disposed on one or more of: a band of the wrist-wearable device, the circuit board, a back cover of the capsule, and a side portion of the capsule. ### Claim 18 (depends on 17) The wrist-wearable device of claim 17, wherein: the strain sensor is coupled to the circuit board and the contact pressure signal is generated by the strain sensor measuring a strain applied to the circuit board. ### Claim 19 (depends on 15) The wrist-wearable device of claim 15, wherein: the pressure sensor is one of a plurality of pressure sensors coupled to the circuit board; each pressure sensor of the plurality of pressure sensors provides a respective contact pressure signals; and respective motion-artifact adjustments to the physiological signal are determined based on the respective contact pressure signals. ### Claim 20 (depends on 15) The wrist-wearable device of claim 15, further including: in accordance with a determination that the physiological measurement is outside of a predetermined threshold, generating an indication displayed at the wrist-wearable device to adjust a wrist-wearable device band tightness.