Automated resuscitation device with ventilation sensing and prompting

• US 9,987,193 B2
• Filed: 06/27/2016
• Issued: 06/05/2018
• Est. Priority Date: 03/17/2006
• Status: Active Grant

• Current Assignee: Zoll Medical Corporation (Asahi Kasei Corporation)
• Original Assignee: Zoll Medical Corporation (Asahi Kasei Corporation)
• Inventors: Freeman, Gary A.
• Primary Examiner(s): Getzow, Scott
• Application Number:
  US15/194,542
• Publication Number:
  US 20160374894A1
• Time in Patent Office: 708 Days
• CPC Class Codes: A61H 2031/002 fixed on the chest by adhesives
• CPC Class Codes: A61H 2201/5007 computer controlled
• CPC Class Codes: A61H 2201/5043 Displays
• CPC Class Codes: A61H 2201/5048 Audio interfaces, e.g. voice or music controlled
• CPC Class Codes: A61H 2201/5071 Pressure sensors
• CPC Class Codes: A61H 2201/5084 Acceleration sensors
• CPC Class Codes: A61H 2230/40 Respiratory characteristics
• CPC Class Codes: A61H 31/005 with feedback for the user
• CPC Class Codes: A61H 31/007 Manual driven
• CPC Class Codes: A61M 16/021 operated by electrical means A61M16/202 – A61M16/205 take precedence
• CPC Class Codes: A61M 16/04 Tracheal tubes catheters in general A61M25/00
• CPC Class Codes: A61M 16/0411 with means for differentiating between oesophageal and tracheal intubation
• CPC Class Codes: A61M 16/0488 Mouthpieces; Means for guiding, securing or introducing the tubes guiding or introducing with laryngoscopes A61B1/267; holding devices on the body A61M25/02
• CPC Class Codes: A61M 2016/0015 inhalation detectors
• CPC Class Codes: A61M 2016/0027 pressure meter
• CPC Class Codes: A61M 2016/003 with a flowmeter
• CPC Class Codes: A61M 2205/332 Force measuring means
• CPC Class Codes: A61M 2205/505 Touch-screens; Virtual keyboard or keypads; Virtual buttons; Soft keys; Mouse touches
• CPC Class Codes: A61M 2205/581 by audible feedback
• CPC Class Codes: A61M 2205/583 by visual feedback
• CPC Class Codes: A61M 2205/587 : Lighting arrangements
• CPC Class Codes: A61M 2230/42 : Rate
• CPC Class Codes: A61N 1/39 : Heart defibrillators
• CPC Class Codes: A61N 1/39044 : in combination with cardiopulmonary resuscitation [CPR] therapy
• CPC Class Codes: A61N 1/3925 : Monitoring; Protecting
• CPC Class Codes: A61N 1/3937 : Monitoring output parameters
• CPC Class Codes: A61N 1/3993 : User interfaces for automatic external defibrillators

Abstract

A device for assisting a caregiver in delivering cardiac resuscitation to a patient, the device comprising a user interface configured to deliver prompts to a caregiver to assist the caregiver in delivering cardiac resuscitation to a patient; at least one sensor configured to detect the caregiver'"'"'s progress in delivering the cardiac resuscitation, wherein the sensor is configured to provide a signal containing information indicative of ventilation; a memory in which a plurality of different prompts are stored, including at least one ventilation progress prompt to guide the rescuer'"'"'s performance of ventilation; a processor configured to process the output of the sensor to determine a parameter descriptive of ventilation progress and to determine whether the ventilation progress prompt should be selected for delivery. Possible parameters descriptive of ventilation progress include ventilation rate, delivered tidal volume, and flow rate.

Claims

1. A device for assisting a caregiver in delivering cardiac resuscitation to a patient, the device comprising

a user interface configured to deliver prompts to a caregiver to assist the caregiver in delivering cardiac resuscitation to a patient;

a motion sensor positioned and configured to detect a movement of the chest wall of the patient;

a processor configured to determine an estimate of the delivered ventilation rate from an output of the motion sensor and to distinguish between ventilations and chest compressions based at least in part on the shape of the leading edge of detected movement for determining the estimate; and

a memory in which a plurality of different prompts are stored, including at least one ventilation progress prompt pertaining to the estimate of the delivered ventilation rate,

wherein the processor is further configured to select a ventilation progress prompt based at least in part on the estimate of the delivered ventilation rate.

2. The device of claim 1 wherein the processor determines the estimate of the ventilation rate without using information from an airway pressure sensor.

3. The device of claim 1 wherein the processor determines the estimate of the ventilation rate using information from both the motion sensor and an airway pressure sensor.

4. The device of claim 1 wherein the processor is further configured to estimate a chest compression rate from the output of the motion sensor.

5. The device of claim 1 wherein the processor is configured to examine a sharpness of the leading edge, wherein greater sharpness is suggesting a chest compression.

6. The device of claim 5 wherein the processor is further configured to examine a frequency content in the leading edge, with higher frequency content suggesting the chest movements result from chest compressions.

7. The device of claim 5 wherein the processor is configured so that generally the sharper the leading edge and the higher the frequency content the more likely that the processor determines that the waveform detected by the motion sensor is a chest compression and not a ventilation.

8. The device of claim 1 wherein the processor is further configured to consider a direction of the movement of the chest wall at the leading edge, with downward displacement increasing the likelihood that the movement is a chest compression.

9. The device of claim 1 wherein the processor is configured to apply a bandpass filter to the output of the motion sensor as part of making the determination of whether the movement is a ventilation or a chest compression.

10. The device of claim 1 wherein the motion sensor comprises an accelerometer.