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Wearable Cardioverter Defibrillator (wcd) with Power-saving Function
| Content Provider | The Lens |
|---|---|
| Abstract | A Wearable Cardioverter Defibrillator (WCD) system has a processor that performs two different analyses to an ECG of the patient. A first-level analysis can be computationally economical, while a fuller second-level analysis can give shock/no-shock advice with more certainty. In some of these embodiments the second-level analysis of the ECG is performed only if the first-level analysis of the ECG detects a possible shockable condition. As such, the first-level analysis may operate as a gatekeeping function, often preventing the more computationally intensive second-level analysis from being performed. An advantage can be that the WCD system needs to store less charge, for powering the processor. In turn, this permits portions of the WCD system to be less bulky and weigh less. |
| Related Links | https://www.lens.org/lens/patent/144-477-374-925-893/frontpage |
| Language | English |
| Publisher Date | 2021-03-09 |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Patent |
| Jurisdiction | United States of America |
| Date Applied | 2017-09-26 |
| Agent | Christensen O'connor Johnson Kindness Pllc |
| Applicant | West Affum Holdings Corp |
| Application No. | 201715715500 |
| Claim | A method for a wearable cardioverter defibrillator (WCD) system, the WCD system including a support structure configured to be worn by an ambulatory patient, an energy storage module configured to store an electrical charge, a discharge circuit coupled to the energy storage module, a transducer and a processor, the method comprising: rendering, by the transducer from a sensed parameter that is an Electrocardiogram (ECG) of the patient, a physiological input that includes ECG data of the patient; performing a first-level analysis on a first portion of the physiological input to detect whether or not a possible shockable condition exists, the first portion including first ECG data from a first time segment; performing, responsive to detecting by the first-level analysis that the possible shockable condition exists, a second-level analysis on a second portion of the physiological input to detect whether or not an actual shockable condition exists, the second portion including second ECG data from a second time segment, in which the second-level analysis is different from the first-level analysis, and performing the second-level analysis requires the processor to consume more energy than performing the first-level analysis if the first time segment had an equal duration with the second time segment; and controlling, responsive to thus detecting that the actual shockable condition exists, the discharge circuit to discharge the stored electrical charge through the patient so as to deliver a shock to the patient while the support structure is worn by the patient. The method of claim 1, in which the first-level analysis has a higher sensitivity than the second-level analysis. The method of claim 1, in which the second time segment has a different time duration than the first time segment. The method of claim 1, in which the second time segment overlaps with the first time segment at least in part. The method of claim 1, in which If the actual shocking condition is thus not detected to exist, the first-level analysis is then repeated. The method of claim 1, in which if the actual shocking condition is thus not detected to exist, neither the first-level analysis nor the second-level analysis is then performed for a preset pause time. The method of claim 1, in which the ECG data is acquired from a plurality of distinct ECG channels, the first-level analysis includes analyzing the ECG data of a first number of the ECG channels, and the second-level analysis includes analyzing the ECG data of a second number of the ECG channels that is larger than the first number. The method of claim 1, in which the ECG data is acquired from at least a first and a second distinct ECG channels, the first ECG channel is designated as the best ECG channel, the first-level analysis includes analyzing the ECG data of only the ECG channel that has been thus designated as the best ECG channel, the second ECG channel becomes designated as the best ECG channel responsive to the second-level analysis, and after the second-level analysis is performed, the first-level analysis is performed again and includes analyzing the ECG data of only the ECG channel that has been thus designated as the best ECG channe The method of claim 1, in which the first-level analysis includes extracting a numerical statistic from the first ECG data, and the possible shockable condition is detected if a value of the statistic is beyond a threshold value. The method of claim 9, in which the statistic includes a heart rate. The method of claim 9, in which the statistic includes a heart rate, and the possible shockable condition is detected if a value of the heart rate exceeds a threshold value of 135 BPM+/−10%. The method of claim 9, in which the statistic includes a heart rate, and the possible shockable condition is detected if a value of the heart rate is less than a threshold value of 40 BPM+/−10%. The method of claim 9, in which the threshold value is set adaptively. The method of claim 13, in which the threshold value is set such that the possible shockable condition is detected on an expected number of occasions per day. The method of claim 13, in which the threshold value is set based on a number of actual shockable conditions detected by a plurality of iterations of the second-level analysis. The method of claim 13, in which the power source includes a battery, and the threshold value is set based on a charge level of the battery. The method of claim 13, in which the threshold value is set depending on a result of the second-level analysis. The method of claim 1, in which the first-level analysis is performed on the first ECG data as the first ECG data is streaming only in a single direction. The method of claim 1, in which the WCD system further includes one or more memories, and the first-level analysis is performed on the first ECG data as the first ECG data is streaming from the transducer, and without the streaming first ECG data having been stored in any of the one or more memories. The method of claim 1, in which the processor has a chip that includes a computational module, and the computational module operates in one of: an awake state when the computational module performs either the first-level analysis or the second-level analysis, the chip consuming a high amount of power when the computational module operates in the awake state, and a dormant state different from the awake state when the computational module performs neither the first-level analysis nor the second-level analysis, the chip consuming a low amount of power when in the dormant state, the low amount of power lesser than the high amount of power. The method of claim 20, in which the computational module further transitions from the awake state to the dormant state responsive to the possible shockable condition or the actual shockable condition not being detected. The method of claim 20, in which the computational module further transitions from the dormant state to the awake state responsive to a received wake-up input. The method of claim 22, in which the WCD system further includes a motion detector, and the wake-up input is generated responsive to a motion of the patient that is detected by the motion detector. The method of claim 22, in which the WCD system further comprises a timer, and the wake-up input is generated by the timer at a preset time. The method of claim 24, in which the preset time is when a predefined time period has elapsed during which the computational module has been operating in the dormant state. The method of claim 24, in which the preset time is such that the wake-up input is generated at substantially periodic time segments. The method of claim 1, in which the processor has a clock speed, and the clock speed is faster when the second-level analysis is being performed than when the first-level analysis is being performed. |
| CPC Classification | Diagnosis; Surgery; Identification Electrotherapy;Magnetotherapy;Radiation Therapy;Ultrasound Therapy |
| Examiner | Aaron F Roane |
| Extended Family | 128-705-305-740-31X 086-557-021-753-65X 110-763-540-579-003 032-281-946-418-833 111-986-562-544-228 038-862-558-007-470 093-489-782-529-769 144-477-374-925-893 |
| Patent ID | 10940323 |
| Inventor/Author | Sullivan Joseph L Kim Jaeho |
| IPC | A61N1/39 A61B5/00 A61B5/0205 A61B5/11 A61B5/361 A61B5/363 A61N1/04 |
| Status | Active |
| Owner | Physio-control Development Co. Llc West Affum Holdings Corp West Affum Holdings Dac |
| Simple Family | 128-705-305-740-31X 086-557-021-753-65X 110-763-540-579-003 032-281-946-418-833 111-986-562-544-228 038-862-558-007-470 093-489-782-529-769 144-477-374-925-893 |
| CPC (with Group) | A61B5/6805 A61B5/6823 A61B5/0205 A61B5/1118 A61B5/4836 A61N1/3904 A61B5/361 A61B5/363 A61N1/0484 A61N1/3956 A61N1/3968 A61N1/3975 A61N1/3987 |
| Issuing Authority | United States Patent and Trademark Office (USPTO) |
| Kind | Patent/New European patent specification (amended specification after opposition procedure) |
