Passive contactless monitor for detecting cessation of cardiopulmonary

• US 4,438,771 A
• Filed: 04/26/1982
• Issued: 03/27/1984
• Est. Priority Date: 04/26/1982
• Status: Expired due to Fees

• Current Assignee: The University of Virginia Patent Foundation
• Original Assignee: The University of Virginia Patent Foundation
• Inventors: Block, Gene D., Friesen, W. Otto
• Primary Examiner(s): Howell, Kyle L.
• Assistant Examiner(s): Hanley, John C.
• Application Number:
  US06/371,933
• Time in Patent Office: 701 Days
• Field of Search: 128/716, 128/721-723, 128/670, 128/671, 340/573, 128/782, 128/774
• US Class Current: 600/484
• CPC Class Codes: A61B 5/113 occurring during breathing

Abstract

An apparatus and method is disclosed for detecting the cessation of movement of a body by detecting the voltage produced by the movement of the charge on said body because of the body'"'"'s movement. This is accomplished by a passive contactless conductive pad which is spaced from the body and in which a potential is induced by the movement of the body through the movement of the charge on the body. This potential is amplified and an alarm indication device responds to the amplified potential to produce an alarm when the output of the amplifier is below a predetermined value or for a predetermined period of time. This device enables the unattended monitoring of breathing and heart functioning for long periods of time.

Claims

1. An apparatus for detecting cessation of cardiopulmonary functioning of a human body, comprising:

a passive conductive means, spaced apart from said body in which a potential is directly induced by the movement of said body due to the movement of the charge of said body when said cardiopulmonary functioning occured;

monitor means responsive to said directly induced potential to produce a indication of cessation of cardiopulmonary functions of said body.

2. The apparatus according to claim 1 wherein said monitor means includes a potential amplification means response to said induced potential to produce a voltage output representative of movement of said body and an alarm indication means responsive to the output of said amplifier means to produce an indication signal by the output of said amplifier means is below a predetermined value for a predetermined period of time.

4. The apparatus of claim 1 wherein said passive charge movement detecting conductive means consists of a pair of conductive layers separated by an insulating layer and wherein said conductive means is spaced from said body by at least a covering plastic layer.

5. The apparatus according to claim 1 wherein said passive charge variation detecting conductive means comprises;

a first conductor; and

a second conductor spaced apart from said first conductor concentric with said first conductor and with said second conductor located entirely in the same horizontal plane as said first conductor.

6. The apparatus according to claim 1 wherein said potential amplification means responsive to said induced potential has a variable amplification factor in order to adjust the sensitivity of said conductive means.

7. An apparatus according to claim 1 wherein said potential amplification means includes an output display response to said voltage output to produce a visual indication of body movement.

3. An apparatus for detecting cessation of movement of a body containing a charge comprising:

a passive charge movement detecting conductive means spaced from said body in which a potential is directly induced on said conductive means by the movement of said charge caused by the movement of said body;

potential amplification means responsive to said induced potential to produce a voltage output representative of movement of said body; and

alarm indicator means responsive to the output of said amplification means to produce a signal indicating the cessation of movement of said body when the output of said amplification means is below a predetermined value for a predetermined period of time.

8. An apparatus according to claim 3 wherein said potential amplification means and said alarm indication means are constructed in a same unit and said unit is attached to said conductive means by leads.

9. A method for detecting cessation of movement of a body containing a charge, comprising the steps of:

detecting the movement of said body by means of a measurement of a potential directly produced as a result of said movement of said charge caused by the movement of said body;

outputting by means of a passive conducting means, said potential produced by said movement;

amplifying said outputted potential to produce a voltage output representative of body movement; and

producing an alarm indicating cessation of movement of said body when said voltage output is below a predetermined value for a predetermined period of time.

10. The method of claim 9 including the further steps of encapsulating said conductive means in plastic and placing said encapsulated conductive means beneath said body to be monitored.