Reference sensor for CPR feedback device

Patent metadata

Field	Value
Publication number	US-9486390-B2
Application number	US-201113250974-A
Country	US
Kind code	B2
Filing date	Sep 30, 2011
Priority date	Sep 30, 2010
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

Embodiments of the present concept are directed to medical devices for use by a rescuer who is caring for a patient and includes a bottom device for use with a top device to measure the depth of Cardio Pulmonary Resuscitation (CPR) chest compressions delivered to the chest of a patient. The top device is intended for placement on the chest of the patient and has a top mechanism that is moveable up and down as the chest compressions are delivered to the patient. The bottom device includes a generally elongate member having a handle at one end and a bottom mechanism near the opposite end. The elongate member is structured to be placed under the patient during delivery of CPR. The top mechanism and the bottom mechanism cooperate to generate a value for a net depth of the compressions of the patient chest with reference to each other.

First claim

What is claimed is:

1. A bottom device for use with a top device to measure depths of Cardio Pulmonary Resuscitation (CPR) chest compressions delivered to the chest of a patient placed face up on a surface, the top device intended for placement on the chest of the patient and having a top mechanism that is moveable up and down as the chest compressions are delivered to the patient and configured to measure displacement of the top device during the chest compressions, the bottom device comprising:
a generally elongate member having a near end and a distal end, the distal end configured to be placed under the chest of the patient;
a handle at the near end for grasping the elongate member;
a bottom mechanism positioned proximately at the distal end, and
a slide portion disposed on an underside of the bottom device, near the distal end, and configured to slide with respect to a surface, and
a grip portion disposed toward the near end relative to the slide portion, the grip portion having a surface less smooth than the slide portion and configured to restrict movement on the surface on a bottom surface of the bottom device,

in which:
the elongate member is configured to be placed between the patient and the surface so that at least a portion of the handle protrudes from under the patient,
when the bottom mechanism is placed between the patient and the surface, the bottom device is moveable up and down as the chest compressions cause the surface to move up and down and the bottom mechanism is configured to measure displacement of the bottom device during the chest compressions, and

the top mechanism and the bottom mechanism are configured to cooperate to generate a value for a net depth of the compressions of the patient chest with reference to each other based on the displacement of the top mechanism and a displacement of the bottom mechanism.

2. The device of claim 1 , in which
the top mechanism comprises a top sensor and the bottom mechanism comprises a reference sensor.

3. The device of claim 1 , in which
the elongate member is structured to be placed so that the bottom mechanism becomes located substantially under a footprint of the top mechanism.

4. The device of claim 1 , in which
the elongate member is configured to be placed under the patient from a side of the patient where the handle is substantially adjacent to a ribcage of the patient.

5. The device of claim 1 , in which
the elongate member is configured to be placed under the patient from a top of the patient where the handle is substantially adjacent to a head of the patient.

6. The device of claim 1 , in which
the elongate member has a width that exceeds its cross-sectional height.

7. The device of claim 1 , in which
the handle includes an elevated loop.

8. The device of claim 1 , in which
the handle is shaped so as to allow a rescuer to push the bottom device beneath the patient or pull the bottom device from beneath the patient.

9. The device of claim 1 , in which
at least one of the top mechanism and the bottom mechanism establishes a magnetic field for the other.

10. The device of claim 1 , in which
the top mechanism and the bottom mechanism communicate wirelessly with each other using a wireless transmitter.

11. The device of claim 1 , in which
the top mechanism and the bottom mechanism include separate power sources.

12. The device of claim 1 , in which
one of the top mechanism and the bottom mechanism include an accelerometer.

13. The device of claim 1 , in which
the bottom device is adapted to be coupled with the top device via a tether.

14. The device of claim 13 , in which
the tether is structured to directly communicate measured data from the bottom device to the top device.

15. The device of claim 13 , in which
the tether is structured to provide power to components of the bottom device from a power source in the top device.

16. A method of determining compression depth during Cardio Pulmonary Resuscitation (CPR) being performed on a patient placed on a surface using a top device placed on a chest of the patient, the top device having a top mechanism, and using a bottom device inserted under the patient, the bottom device comprising a generally elongate member having a handle at a near end of the bottom device and having a bottom mechanism at a distal end of the bottom device, the distal end configured to be placed under the chest of the patient, and a slide portion disposed on an underside of the bottom device, near the distal end, and configured to slide with respect to a surface, and a grip portion disposed toward the near end relative to the slide portion, and configured to restrict movement on the surface on a bottom surface of the bottom device by the grip portion having a surface that is rougher than the slide portion, the method comprising:
receiving a signal that CPR has begun;
measuring a top compression depth with the top mechanism;
measuring a bottom compression depth with the bottom mechanism; and
generating a net compression depth by comparing the measured top compression depth and the measured bottom compression depth.

17. The method of claim 16 , further comprising:
recording the net compression depth.

18. The method of claim 16 , further comprising:
outputting a user-feedback signal based on the generated net compression depth.

19. The method of claim 18 , further comprising:
outputting a user-alert signal when the generated net compression depth is outside of a predefined range.

20. A method of determining compression depth during Cardio Pulmonary Resuscitation (CPR) being performed on a patient placed on a surface using a top device having a top mechanism and using a bottom device comprising a generally elongate member having a handle at a near end of the bottom device and having a bottom mechanism at a distal end of the bottom device, the distal end configured to be placed under the chest of the patient, and a slide portion disposed on an underside of the bottom device, near the distal end, and configured to slide with respect to a surface and a grip portion disposed toward the near end relative to the slide portion, and configured to restrict movement on the surface on a bottom surface of the bottom device by the grip portion having a surface that is rougher than the slide portion, the method comprising:
grasping the bottom device by the handle;
inserting the distal end of the bottom device under the patient;
delivering CPR compressions to a chest of a patient that causes the chest of the patient and the surface to move up and down, where a value of a compression depth is generated by the top and the bottom mechanism; and

then grasping the bottom device by the handle and removing the bottom device from under the patient.

21. The method of claim 20 , further comprising:
receiving an outputted signal based on the generated compression depth value.

22. The method of claim 20 , in which:
the value of the compression depth is generated by comparing a value measured by the top mechanism with a value measured by the bottom mechanism.

23. The method of claim 20 , in which:
inserting the distal end of the bottom device under the patient includes placing the distal end of the bottom device under the patient where the bottom mechanism is located substantially under a footprint of the top mechanism.

24. The method of claim 23 , in which:
inserting the distal end of the bottom device

Assignees

• Centen Corey J
• Smith Sarah A
• Browne Gregory V
• Lee Ryan D
• Wilkinson Maegan P
• Nova Richard C
• Physio Control Inc

Inventors

• Centen Corey J
• Smith Sarah A
• Browne Gregory V
• Lee Ryan D
• Wilkinson Maegan P
• Nova Richard C

Classifications

• A61H31/007 Primary

  Manual driven · CPC title

• A61H31/005

  with feedback for the user · CPC title

• A61H2201/5061

  Force sensors · CPC title

• A61H2201/5097

  wireless · CPC title

• A61H2201/5084

  Acceleration sensors · CPC title