Patient monitor sheets

• US 5,448,996 A
• Filed: 02/08/1994
• Issued: 09/12/1995
• Est. Priority Date: 02/02/1990
• Status: Expired due to Fees

• Current Assignee: Lifesigns Corporation
• Original Assignee: Lifesigns Corporation
• Inventors: Dingwall, Robert P., Bellin, Howard T.
• Primary Examiner(s): Sykes, Angela D.
• Application Number:
  US08/193,698
• Time in Patent Office: 581 Days
• Field of Search: 128/670-671, 128/721-723, 128/715, 128/774, 128/782
• US Class Current: 600/574
• 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 5/113 occurring during breathing
• CPC Class Codes: A61B 5/6892 Mats

Abstract

A patient monitor sheet device of simplified construction permits the accurate measurement of respiration, heart beat, and body position with a minimum of intrusion on the subject. Sensors are located in a bed sheet with which a subject comes in contact. One sensor produces a signal corresponding to respiratory induced, pulmonary motion, and myocardial pumping sounds. A second sensor produces a signal corresponding to changes in body position. A processor amplifies and filters the induced signals resulting in resolved output highly correlated to respiration rate, heart beat rate, and changes in body position.

Claims

1. A device for monitoring patients, comprising:

a) a sheet having a first sensor segment and a second sensor segment;

b) said first sensor segment comprised of a metallic foil layer and a first flexible polymeric layer;

c) said second sensor segment comprised of a piezoelectric film layer and a second flexible polymeric layer;

d) said first sensor segment capable of generating an electrical signal corresponding to body position of said patient being monitored; and

e) said second sensor segment capable of generating an electrical signal corresponding to respiratory induced, pulmonary motion and cardiovascular pumping action.

2. The monitoring device of claim 1, wherein said first sensor segment comprised of said metallic foil layer and said first flexible polymeric layer creates electric capacitance when a part of the body of said patient being monitored exerts a weight force thereon.

3. The monitoring device of claim 1, wherein said electric signal from said first sensor segment is filtered then processed in a signal process means capable of generating a digital output corresponding to body position of said patient being monitored.

4. The monitoring device of claim 1, wherein said electric signal from said second sensor segment is filtered then processed in a signal process means capable of generating a digital output corresponding to respiration rate and heart rate of said patient being monitored.

5. The monitoring device of claim 1, wherein said electric signal from said first sensor segment is processed in a signal process means having stored program memory containing parameters which sets off an alarm when the body position of said patient being monitored exceeds said parameters.

6. The monitoring device of claim 1, wherein said electric signal from said second sensor segment is processed in a signal process means having stored program memory containing parameters which sets off an alarm when the respiratory rate of said patient being monitored exceeds or falls below said parameters.

7. The monitoring device of claim 1, wherein said electric signal from said second sensor segment is processed in a signal process means having stored program memory containing parameters which sets off an alarm when the heart beat rate of said patient being monitored exceeds or falls below said parameters.

8. A patient monitoring sheet, comprising:

a) a first sensor segment comprised of a layer of aluminum foil situated between a first flexible polymeric layer and a second flexible polymeric layer;

b) a second sensor segment comprised of a piezo-electric film layer situated between said second flexible polymeric layer and a third flexible polymeric layer;

c) said first sensor segment capable of generating an electrical signal corresponding to body position of said patient being monitored; and

d) said second sensor segment capable of generating an electrical signal corresponding to respiratory induced, pulmonary motion and cardiovascular pumping action.

9. The monitoring device of claim 8, wherein said electric signal from said first sensor segment is filtered then processed in a signal process means capable of generating a digital output corresponding to body position of said patient being monitored.

10. The monitoring device of claim 8, wherein said electric signal from said second sensor segment is filtered then processed in a signal process means capable of generating a digital output corresponding to respiration rate of said patient being monitored.

11. The monitoring device of claim 8, wherein said electric signal from said second sensor segment is filtered then processed in a signal process means capable of generating a digital output corresponding to heart rate of said patient being monitored.

12. A device for monitoring respiratory activity, heart rate and body position, comprising:

a) a first detector means sensitive to respiratory induced motion and heart beat sounds, said first detector means capable of generating a first electrical signal in response to said respiratory induced motion and heart beat;

b) a second detector means sensitive to changes in body position, said detector means capable of generating a second electrical signal corresponding to movement by the detector means in response to said body position changes; and

c) a processor means for receiving said first and second electrical signals from said detector means and converting said electrical signal into filtered signals for an output device.

13. The device of claim 12, wherein said first detector means comprises a piezo-electric film.

14. The device of claim 12, wherein said second detector means comprises a planar sheet of aluminum foil.

15. The device of claim 12, wherein said processor means comprises a signal amplifier coupled to at least one electronic filter.

16. The device of claim 15, wherein said filter is selected from the group consisting of those with a frequency cutoff of 5 Hz, 50 Hz, and 100 Hz.

17. The device of claim 12, wherein an alarm in communication with said processor means is triggered by a change in said respiratory induced motion or heart beat.

18. The device of claim 12, wherein an alarm in communication with said processor means is triggered by a change in said body position.