Filtering patient signal also for ventilation artifacts

• US 9,775,566 B2
• Filed: 01/30/2017
• Issued: 10/03/2017
• Est. Priority Date: 09/24/2012
• Status: Active Grant

• Current Assignee: Physio-Control Incorporated (Stryker Corporation)
• Original Assignee: Physio-Control Incorporated (Stryker Corporation)
• Inventors: Sullivan, Joseph L., Walker, Robert G.
• Primary Examiner(s): Holmes, Rex R
• Application Number:
  US15/420,035
• Publication Number:
  US 20170135642A1
• Time in Patent Office: 246 Days
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/053 Measuring electrical impedance or conductance of a portion of the body
• CPC Class Codes: A61B 5/0836 Measuring rate of CO2 production
• CPC Class Codes: A61B 5/087 Measuring breath flow
• CPC Class Codes: A61B 5/316 Modalities, i.e. specific diagnostic methods
• CPC Class Codes: A61B 5/318 Heart-related electrical modalities, e.g. electrocardiography [ECG]
• CPC Class Codes: A61B 5/361 Detecting fibrillation
• CPC Class Codes: A61B 5/4836 Diagnosis combined with treatment in closed-loop systems or methods A61B5/0036 takes precedence
• CPC Class Codes: A61B 5/7207 of noise induced by motion artifacts
• CPC Class Codes: 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
• CPC Class Codes: A61B 5/7217 of noise originating from a therapeutic or surgical apparatus, e.g. from a pacemaker
• CPC Class Codes: A61B 5/742 using visual displays A61B5/339 takes precedence
• CPC Class Codes: A61H 2201/501 connected to external computer devices or networks
• CPC Class Codes: A61H 2201/5043 Displays
• CPC Class Codes: A61H 2201/5097 wireless
• CPC Class Codes: A61H 2230/045 used as a control parameter for the apparatus
• CPC Class Codes: A61H 2230/206 used as a control parameter for the apparatus
• CPC Class Codes: A61H 2230/208 used as a control parameter for the apparatus
• CPC Class Codes: A61H 2230/305 used as a control parameter for the apparatus A61H2230/045 takes precedence
• CPC Class Codes: A61H 2230/505 used as a control parameter for the apparatus
• CPC Class Codes: A61H 31/005 : with feedback for the user
• CPC Class Codes: A61M 16/0057 : Pumps therefor
• CPC Class Codes: A61M 16/0069 : the speed thereof being controlled by respiratory parameters, e.g. by inhalation
• CPC Class Codes: A61M 16/021 : operated by electrical means A61M16/202 – A61M16/205 take precedence
• CPC Class Codes: A61N 1/39044 : in combination with cardiopulmonary resuscitation [CPR] therapy
• CPC Class Codes: A61N 1/3925 : Monitoring; Protecting

Abstract

In embodiments, an external medical device is intended to care for a patient. If it receives an input that signifies that ventilation artifact is present in a signal of the patient, it transmits a corrective signal responsive to the received input. In further embodiments, a patient signal is received, which is generated from a patient while the patient is or was receiving chest compressions at a frequency Fc, and also receiving ventilations at frequency Fv. At least one filter mechanism may be applied to the patient signal to substantially remove artifacts at a) frequency Fc, b) a higher harmonic of frequency Fc, and c) a third frequency substantially equaling frequency Fc plus or minus frequency Fv, while substantially passing other frequencies between them. As a result, the patient signal can be cleaner, for diagnosing the patient'"'"'s state more accurately.

Claims

1. An external device for use when a patient is receiving ventilations from a ventilator that is being operated by a rescuer, comprising:

a housing; and

a processor within the housing configured to;

perform a correlation of a sensed patient impedance signal with an airway signal of the patient;

receive, responsive to the performed correlation, an input signifying that a ventilation artifact is present in the sensed patient impedance signal, the ventilation artifact possibly due to the ventilations from the ventilator; and

cause to be transmitted a corrective signal responsive to the received input; and

a user interface configured to output, responsive to the corrective signal, a prompt to the rescuer.

2. The device of claim 1, in which

the prompt indicates the presence of a ventilation artifact.

3. The device of claim 1, in which

the prompt is to the effect that the rescuer should discontinue operating the ventilator that presumptively has caused the ventilation artifact.

4. The device of claim 1, in which

the airway signal is a capnography signal, an airway pressure signal, or an airflow signal of the patient.

5. The device of claim 1, in which the processor is further configured to:

cause a record to be created about one of the input and the corrective signal.

6. A non-transitory computer-readable storage medium storing one or more programs which, when executed by at least one external device that is intended for use when a patient is receiving ventilations from a ventilator that is being operated by a rescuer, the external device including a processor and a user interface, the one or more programs result in:

performing a correlation of a sensed patient impedance signal with an airway signal of the patient;

receiving, responsive to the performed correlation, an input signifying that a ventilation artifact is present in the sensed patient impedance signal, the ventilation artifact possibly due to the ventilations from the ventilator;

causing to be transmitted a corrective signal responsive to the received input; and

causing to be output, responsive to the corrective signal, a prompt to the rescuer.

7. The medium of claim 6, in which

the prompt indicates the presence of a ventilation artifact.

8. The medium of claim 6, in which

the prompt is to the effect that the rescuer should discontinue operating the ventilator that presumptively has caused the ventilation artifact.

9. The medium of claim 6, in which

the airway signal is a capnography signal, an airway pressure signal, or an airflow signal of the patient.

10. The medium of claim 6, in which executing the one or more programs further results in:

causing a record to be created about one of the input and the corrective signal.

11. A method for an external medical device intended for use when a patient is receiving ventilations from a ventilator that is being operated by a rescuer, the method comprising:

performing a correlation of a sensed patient impedance signal with an airway signal of the patient;

receiving, responsive to the performed correlation, an input signifying that a ventilation artifact is present in the sensed patient impedance signal, the ventilation artifact possibly due to the ventilations from the ventilator;

transmitting a corrective signal responsive to the received input; and

outputting, responsive to the corrective signal, a prompt to the rescuer.

12. The method of claim 11, in which

the prompt indicates the presence of a ventilation artifact.

13. The method of claim 11, in which

the prompt is to the effect that the rescuer should discontinue operating the ventilator that presumptively has caused the ventilation artifact.

14. The method of claim 11, in which

the airway signal is a capnography signal, an airway pressure signal, or an airflow signal of the patient.

15. The method of claim 11, further comprising:

causing a record to be created about one of the input and the corrective signal.