US 11,051,714 B2
Wearable device for the continuous monitoring of the respiratory rate
Andrea Aliverti, Como (IT); and Ambra Cesareo, Brivio (IT)
Assigned to POLITECNICO DI MILANO, Milan (IT)
Appl. No. 16/629,997
Filed by POLITECNICO DI MILANO, Milan (IT)
PCT Filed Jul. 5, 2018, PCT No. PCT/IB2018/054956
§ 371(c)(1), (2) Date Jan. 10, 2020,
PCT Pub. No. WO2019/012384, PCT Pub. Date Jan. 17, 2019.
Claims priority of application No. 102017000078138 (IT), filed on Jul. 11, 2017.
Prior Publication US 2020/0170544 A1, Jun. 4, 2020
Int. Cl. A61B 5/08 (2006.01); A61B 5/00 (2006.01)
CPC A61B 5/0816 (2013.01) [A61B 5/0002 (2013.01); A61B 5/6801 (2013.01); A61B 5/721 (2013.01); A61B 2562/0219 (2013.01); A61B 2562/0223 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A wearable device for continuous monitoring of a respiratory rate of a patient, comprising: three inertial sensors (10, 11, 12), a first inertial sensor (10) of the three inertial sensors being positioned on an abdomen (13), a second inertial sensor (11) of the three inertial sensors being positioned on a thorax (14), and a third reference inertial sensor (12) of the three inertial sensor being positioned on a part of a body (15) not subject to respiratory movements, fixed with respect to a torso, each inertial sensor (10, 11, 12) of the three inertial sensors comprising an accelerometer, a magnetometer, and a gyroscope, each inertial sensor (10, 11, 12) comprising a microprocessor (21) connected to said accelerometer, magnetometer, and gyroscope, said microprocessor (21) being connected to a transmitter (22), and being configured for processing signals and for supplying to said transmitter (22) a signal represented by a quaternion that describes an orientation of said three inertial sensors with respect to Earth's reference system; a receiver (30) connected to a control centre (31) and configured for receiving an abdominal quaternion of the first inertial sensor, a thoracic quaternion of the second inertial sensor, and a reference quaternion of the third reference inertial sensor, and for sending them to said control centre (31), said control centre (31) being configured for processing the abdominal quaternions and thoracic quaternions received so that the abdominal quaternion and the thoracic quaternion are referenced to the reference quaternion, said control centre (31) comprising a band-pass adaptive filter (55, 56), which filters signals represented by the abdominal quaternion and by the thoracic quaternion to eliminate residual components linked to movements of the patient, said control centre (31) being configured for calculating respiratory rate only from signals represented by a filtered abdominal quaternion and by a filtered thoracic quaternion.