BLOOD PRESSURE-MONITORING SYSTEM WITH ALARM/ALERT SYSTEM THAT ACCOUNTS FOR PATIENT MOTION
First Claim
1. A system for measuring vital signs from a patient, comprising:
- (a) a first sensor configured to generate a first time-dependent waveform indicative of one or more contractile properties of the patient'"'"'s heart;
(b) a second sensor configured to generate a second time-dependent waveform indicative of one or more contractile properties of the patient'"'"'s heart;
(c) at least two motion-detecting sensors positioned on a location selected from a forearm, upper arm, and a body location other than the forearm or upper arm of the patient, each of said motion-detecting sensors generating at least one time-dependent motion waveform indicative of motion of the location on the patient'"'"'s body to which the motion-detecting sensor is affixed; and
,(d) a processing component configured to be worn on the patient'"'"'s body and comprising a microprocessor, said processing component configured to receive the first time-dependent waveform, the second time-dependent waveform, and the at least one time-dependent motion waveform generated by each motion-detecting sensor and determine therefrom;
(i) one or more vital signs calculated using the first and second time-dependent waveforms;
(ii) at least one motion parameter selected from the patient'"'"'s posture, activity level, arm height, and degree of motion and calculated using at least one motion waveform generated by each of said motion-detecting sensors; and
(iii) at least one alarm condition calculated using one or more of the vital signs and at least one motion parameter, wherein an alarm condition indicated by a variance in one or more of the vital signs is regulated according to one or more motion parameters.
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Accused Products
Abstract
The invention provides a system and method for measuring vital signs (e.g. SYS, DIA, SpO2, heart rate, and respiratory rate) and motion (e.g. activity level, posture, degree of motion, and arm height) from a patient. The system features: (i) first and second sensors configured to independently generate time-dependent waveforms indicative of one or more contractile properties of the patient'"'"'s heart; and (ii) at least three motion-detecting sensors positioned on the forearm, upper arm, and a body location other than the forearm or upper arm of the patient. Each motion-detecting sensor generates at least one time-dependent motion waveform indicative of motion of the location on the patient'"'"'s body to which it is affixed. A processing component, typically worn on the patient'"'"'s body and featuring a microprocessor, receives the time-dependent waveforms generated by the different sensors and processes them to determine: (i) a pulse transit time calculated using a time difference between features in two separate time-dependent waveforms, (ii) a blood pressure value calculated from the time difference, and (iii) a motion parameter calculated from at least one motion waveform.
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Citations
21 Claims
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1. A system for measuring vital signs from a patient, comprising:
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(a) a first sensor configured to generate a first time-dependent waveform indicative of one or more contractile properties of the patient'"'"'s heart; (b) a second sensor configured to generate a second time-dependent waveform indicative of one or more contractile properties of the patient'"'"'s heart; (c) at least two motion-detecting sensors positioned on a location selected from a forearm, upper arm, and a body location other than the forearm or upper arm of the patient, each of said motion-detecting sensors generating at least one time-dependent motion waveform indicative of motion of the location on the patient'"'"'s body to which the motion-detecting sensor is affixed; and
,(d) a processing component configured to be worn on the patient'"'"'s body and comprising a microprocessor, said processing component configured to receive the first time-dependent waveform, the second time-dependent waveform, and the at least one time-dependent motion waveform generated by each motion-detecting sensor and determine therefrom;
(i) one or more vital signs calculated using the first and second time-dependent waveforms;
(ii) at least one motion parameter selected from the patient'"'"'s posture, activity level, arm height, and degree of motion and calculated using at least one motion waveform generated by each of said motion-detecting sensors; and
(iii) at least one alarm condition calculated using one or more of the vital signs and at least one motion parameter, wherein an alarm condition indicated by a variance in one or more of the vital signs is regulated according to one or more motion parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for measuring vital signs from a patient, comprising:
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(a) a first sensor configured to generate a first time-dependent waveform indicative of one or more contractile properties of the patient'"'"'s heart; (b) a second sensor configured to generate a second time-dependent waveform indicative of one or more contractile properties of the patient'"'"'s heart; (c) at least three motion-detecting sensors positioned on the forearm, upper arm, and a body location other than the forearm or upper arm of the patient, each of said motion-detecting sensors generating at least one time-dependent motion waveform indicative of motion of the location on the patient'"'"'s body to which the motion-detecting sensor is affixed; (d) a processing component configured to be worn on the patient'"'"'s body and comprising a microprocessor, said processing component configured to receive the first time-dependent waveform, the second time-dependent waveform, and the at least one time-dependent motion waveform generated by each motion-detecting sensor and determine therefrom;
(i) a pulse transit time calculated using a time difference between a time-dependent feature in each of the first and second time-dependent waveforms, (ii) a blood pressure value calculated using said time difference, and (iii) at least one motion parameter selected from the patient'"'"'s posture, activity level, and degree of motion calculated using at least one motion waveform generated by each of said motion-detecting sensors; and(e) a wireless communication system configured to be worn on the patient'"'"'s body and operably connect to the processing component, the wireless system configured to wirelessly transmit the blood pressure value and at least one motion parameter determined by the processing component to a remote receiver.
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18. A system for measuring vital signs from a patient, comprising:
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(a) a sensor configured to detect a first time-dependent physiological waveform indicative of one or more contractile properties of the patient'"'"'s heart; (b) a cable system comprising; an electrical sensor comprising;
at least two electrodes configured to detect electrical signals from the patient'"'"'s body and operably connect to an electrical circuit configured to process the detected electrical signals, the electrical sensor generating a time-dependent electrical waveform indicative of one or more contractile properties of the patient'"'"'s heart, and,at least two motion-detecting sensors, each of said motion-detecting sensors generating at least one time-dependent motion waveform indicative of motion of the location on the patient'"'"'s body to which the motion-detecting sensor is affixed; and
,(c) a processing component configured to be worn on the patient'"'"'s body and comprising a microprocessor and one or more electrical connectors for operably connecting the microprocessor to the sensor and the cable system, said processing component configured to receive the time-dependent electrical waveform, the time-dependent physiological waveform, and the at least one time-dependent motion waveform generated by each motion-detecting sensor and determine therefrom;
(i) at least one vital sign calculated using at least one of the time-dependent physiological waveform and the time-dependent electrical waveform, and (ii) at least one motion parameter selected from the patient'"'"'s posture, activity level, arm height, and degree of motion calculated using at least one time-dependent motion waveform generated by each of said motion-detecting sensors.
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19. A system for measuring a blood pressure from a patient, comprising:
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(a) a first sensor configured to generate a first time-dependent waveform indicative of one or more contractile properties of the patient'"'"'s heart; (b) an electrical sensor comprising;
at least two electrodes configured to detect electrical signals from the patient'"'"'s body, and an electrical circuit operably connected to the electrodes and configured to process the detected electrical signals, the electrical sensor generating a time-dependent electrical waveform indicative of one or more contractile properties of the patient'"'"'s heart;(c) at least two motion-detecting sensors positioned on separate locations on the patient'"'"'s body, each of said motion-detecting sensors generating at least one time-dependent motion waveform indicative of motion of the location on the patient'"'"'s body to which the motion-detecting sensor is affixed; and
,(d) a processing component configured to be worn on the patient'"'"'s body and comprising a microprocessor, said processing component configured to receive the first time-dependent waveform, the time-dependent electrical waveform, and the at least one time-dependent motion waveform generated by each motion-detecting sensor, and to determine;
(i) a first arm position from one or more of the time-dependent motion waveforms acquired in a first arm position;
(ii) a first time difference between a feature present in each of a first time-dependent waveform and a first time-dependent electrical waveform acquired in the first arm position;
(iii) a second arm position from one or more of the time-dependent motion waveforms acquired in a second arm position;
(iv) a second time difference between a feature present in each of a second time-dependent waveform and a second time-dependent electrical waveform acquired in the second arm position;
(v) a first blood pressure value calculated at the first arm position;
(vi) a second blood pressure value calculated at the second arm position;
(vii) a blood pressure factor calculated using the first blood pressure value and the first time difference or a property derived therefrom, together with the second blood pressure value and the second time difference or a property derived therefrom.
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20. A method for monitoring a patient, comprising the following steps:
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(a) detecting a first time-dependent physiological waveform indicative of one or more contractile properties of the patient'"'"'s heart with a first sensor comprising a first detector configured to be worn on the patient'"'"'s body; (b) detecting a second time-dependent physiological waveform indicative of one or more contractile properties of the patient'"'"'s heart with a second sensor comprising a second detector configured to be worn on the patient'"'"'s body; (c) detecting sets of time-dependent motion waveforms with at least two motion-detecting sensors positioned on different locations on the patient'"'"'s body, wherein each motion-detecting sensor detects a set of motion waveforms indicative of motion of the location on the patient'"'"'s body to which the motion-detecting sensor is affixed; (d) processing the first and second time-dependent physiological waveforms to determine at least one vital sign from the patient; (e) analyzing at least a portion of each set of time-dependent motion waveforms, or a mathematical derivative thereof, to determine a motion parameter; (f) processing the motion parameter to determine a probability that the patient is undergoing a specific activity state; and (g) estimating the patient'"'"'s activity state based on the probability.
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21. A method for monitoring vital signs and posture of a patient, the method comprising the following steps:
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(a) detecting a first time-dependent physiological waveform indicative of one or more contractile properties of the patient'"'"'s heart with a first sensor comprising a first detector configured to be worn on the patient'"'"'s body; (b) detecting a second time-dependent physiological waveform indicative of one or more contractile properties of the patient'"'"'s heart with a second sensor comprising a second detector configured to be worn on the patient'"'"'s body; (c) detecting a set of time-dependent motion waveforms with at least one motion-detecting sensor positioned on the patient'"'"'s torso, wherein the one motion-detecting sensor detects a set of motion waveforms indicative of motion of the patient'"'"'s torso; (d) processing the first and second time-dependent physiological waveforms to determine at least one vital sign from the patient; (e) analyzing at least a portion of the set of time-dependent motion waveforms, or a mathematical derivative thereof, to determine a vector corresponding to motion of the patient'"'"'s torso; (f) comparing the vector to a coordinate space representative of how the motion-detecting sensor is oriented on the patient to determine a posture parameter; and (g) comparing the posture parameter to a threshold value to estimate the patient'"'"'s posture.
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Specification