REFERENCE SENSOR FOR CPR FEEDBACK DEVICE

• US 20120083720A1
• Filed: 09/30/2011
• Published: 04/05/2012
• Est. Priority Date: 09/30/2010
• Status: Active Grant

• Current Assignee: Physio-Control Incorporated (Stryker Corporation)
• Original Assignee: Physio-Control Incorporated (Stryker Corporation)
• Inventors: Browne, Gregory V., Lee, Ryan D., Centen, Corey J., Smith, Sarah A., Wilkinson, Maegan P., Nova, Richard C.
• Granted Patent: US 9,486,390 B2
• Time in Patent Office: Days
• US Class Current: 601/41
• CPC Class Codes: A61H 2201/5061 Force sensors
• CPC Class Codes: A61H 2201/5064 Position sensors
• CPC Class Codes: A61H 2201/5071 Pressure sensors
• CPC Class Codes: A61H 2201/5084 Acceleration sensors
• CPC Class Codes: A61H 2201/5097 wireless
• CPC Class Codes: A61H 31/005 with feedback for the user
• CPC Class Codes: A61H 31/007 Manual driven

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.

Claims

1. 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 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, the bottom device comprising:

a generally elongate member having a near end and a distal end;

a handle at the near end for grasping the member; and

a bottom mechanism coupled proximately to the distal end,

in which;

the elongate member is structured to be placed between the patient and the surface so that at least a portion of the handle protrudes from under the patient, the bottom mechanism, when so placed, is moveable up and down as the chest compressions cause the surface to move up and down,

the top mechanism and the bottom mechanism thereby cooperating to generate a value for a net depth of the compressions of the patient chest with reference to each other.

2. The device of claim 1, in which

the top mechanism is a top sensor and the bottom mechanism is 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 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 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 a 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 bottom device includes a slide portion and a grip portion on a bottom surface.

11. The device of claim 1, in which

the top mechanism and the bottom mechanism communicate wirelessly with each other.

12. The device of claim 1, in which

the top mechanism and the bottom mechanism include separate power sources.

13. The device of claim 1, in which

one of the top mechanism and the bottom mechanism include an accelerometer.

14. The device of claim 1, in which

the bottom device is adapted to be coupled with the top device via a tether.

15. The device of claim 14, in which

the tether is structured to communicate measured data from the bottom device to the top device.

16. The device of claim 14, in which

the tether is structured to provide power to components of the bottom device from a power source in the top device.

17. 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 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 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.

18. The method of claim 17, further comprising:

recording the net compression depth.

19. The method of claim 17, further comprising:

outputting a user-feedback signal based on the generated net compression depth.

20. The method of claim 19, further comprising:

outputting a user-alert signal when the generated net compression depth is outside of a predefined range.

21. 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 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 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.

22. The method of claim 21, further comprising:

receiving an outputted signal based on the generated compression depth value.

23. The method of claim 21, 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.

24. The method of claim 21, 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.

25. The method of claim 24, in which:

inserting the distal end of the bottom device under the patient includes inserting the bottom device under the patient where the handle is substantially adjacent to a ribcage of the patient.

26. The method of claim 24, in which:

inserting the distal end of the bottom device under the patient includes inserting the bottom device under the patient where the handle is substantially adjacent to a head of the patient.