Dual-finger vital signs monitor

• US 5,152,296 A
• Filed: 03/01/1990
• Issued: 10/06/1992
• Est. Priority Date: 03/01/1990
• Status: Expired due to Fees

• Current Assignee: Agilent Technologies, Inc.
• Original Assignee: Hewlett-Packard Company (HP Inc.)
• Inventors: Simons, Tad D.
• Primary Examiner(s): Kamm, William E.
• Assistant Examiner(s): Pontius, Kevin
• Application Number:
  US07/487,341
• Time in Patent Office: 950 Days
• Field of Search: 128/670, 128/680, 128/681, 128/686, 128/689, 128/690, 128/633, 128/696, 128/679
• US Class Current: 600/483
• 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 5/02241 of small dimensions, e.g. adapted to fingers
• CPC Class Codes: A61B 5/025 within occluders, e.g. responsive to Korotkoff sounds electric stethoscopes A61B7/04
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/6826 Finger
• CPC Class Codes: A61B 5/6838 Clamps or clips

Abstract

A Dual-Finger Vital Signs Monitor is disclosed. The present invention overcomes problems suffered by previous patient monitors by providing a simultaneous and continuous measurement of three primary vital signs: ECG and heart rate, blood pressure, and blood oxygen saturation. The invention employs a pair of finger cuffs that each include an electro-cardiographic electrode, a first LED and detector pair for blood pressure measurement, and a second LED and detector pair for blood oxygenation measurement. The electrodes are connected to a voltmeter which displays an electrocardiogram. The first LED and detector in each cuff function as a finger-photoplethysmographic pressure sensor. A pair of gas lines connect each finger cuff to a pair of pressure controllers, which each include a fluid reservoir. One of the servos is linked to a blood pressure meter. The second LED and detector pair in each cuff are each connected to a pair of oximeters. All the sensors operate independently. The use of two finger cuffs affords substantial advantages for signal processing and data interpretation. The redundancy of sensors greatly reduces the incidence of false warnings. The Dual-Finger Vital Signs Monitor provides a non-invasive and reliable device for monitoring patients who may suffer from cardiac or respiratory difficulties. This invention constitutes a major step forward in the filed of medical instrumentation.

Claims

1. A vital signs monitor comprising:

a transducing means comprising a first transducer means for measuring a plurality of different types of vital signs;

said first transducer means comprising a plurality of first detector means each constructed differently from one another for detecting the plurality of different types of vital signs;

the plurality of first detector means being mounted proximate one another on a first probe body;

said first probe body being capable of being coupled to a patient; and

a meter means;

the meter means providing a measurement of a plurality of test parameters;

the meter means being coupled to the plurality of first detector means.

2. A vital signs monitor as in claim 1 further comprising:

a memory means for storing a plurality of critical vital sign values;

said memory means being coupled to the meter means; and

an alarm means for providing a warning when any one of said plurality of different types of vital signs fall below said plurality of critical vital sign values stored in said memory means;

said alarm means being coupled to said memory means.

3. A vital signs monitor as in claim 1 wherein:

one of the plurality of first detector means mounted on said first probe body is a first hemoglobin oxygenation detector means for sensing a level of hemoglobin saturated with oxygen in said patient;

the meter means is constructed for providing a measurement of said level of hemoglobin saturated with oxygen;

said first hemoglobin oxygenation detector means is coupled to said meter means.

4. A vital signs monitor as in claim 1 wherein:

one of the plurality of first detector means mounted on said first probe body is a first pressure detection means for sensing a blood pressure level in said patient;

said first probe body comprises a first inflatable pressure cuff means capable of substantially enveloping a first appendage of said patient;

the meter means is constructed for providing a measurement of said blood pressure level;

said transducer means further comprises;

a first fluid conduit means for conveying a fluid to said first inflatable pressure cuff means;

said first fluid conduit means being coupled to said first inflatable pressure cuff means and to said first pressure meter means;

said first fluid conduit means being for the purposes of inflating the cuff means; and

a first fluid reservoir means for controlling said fluid in said first fluid conduit means;

said first fluid reservoir means being coupled to said meter means.

5. A vital signs monitor as in claim 4 wherein;

said first inflatable pressure cuff means is a first inflatable finger cuff means; and

said first appendage of said patient is a first finger digit of said patient.

6. A vital signs monitor comprising:

a transducing means comprising a first transducer means for measuring a vital sign;

said first transducer means comprising a plurality of first detector means mounted proximate one another on a first probe body;

said first probe body being capable of being coupled to a patient; and

a plurality of meter means;

each of the meter means providing a measurement of a respective one of a plurality of test parameters;

each of the meter means being coupled to a respective one of the first detector means;

wherein;

one of the plurality of first detector means mounted on said first probe body is a first potential difference detection means for sensing an electric field in said patient; and

one of the plurality of meter means is a voltage meter means for providing a measurement of said electric field; and

said first potential detection means is coupled to said voltage meter means.

7. A vital signs monitor comprising:

a transducing means comprising a first transducer means for measuring a vital sign;

said first transducer means comprising a plurality of first detector means mounted proximate one another on a first probe body;

said first probe body being capable of being coupled to a patient;

a plurality of meter means;

each of the meter means providing a measurement of a respective one of a plurality of test parameters;

each of the meter means being coupled to a respective one of the first detector means;

one of the plurality of first detector means mounted on said first probe body is a first hemoglobin oxygenation detector means for sensing a level of hemoglobin saturated with oxygen in said patient;

one of the plurality of meter means is a hemoglobin oxygenation meter means for providing a measurement of said level of hemoglobin saturated with oxygen;

said hemoglobin oxygenation meter means comprises a first hemoglobin oxygenation meter means;

said first hemoglobin oxygenation detector means is coupled to said first hemoglobin oxygenation meter means;

one of the plurality of first detector means mounted on said first probe body is a first potential difference detection means for sensing an electric field in said patient;

one of the plurality of meter means is a voltage meter means for providing a measurement of said electric field;

said first potential detection means is coupled to said voltage meter means;

one of the plurality of first detector means mounted on said first probe body is a first pressure detection means for sensing a blood pressure level in said patient;

said first probe body comprises a first inflatable pressure cuff means capable of substantially enveloping a first appendage of said patient;

one of the plurality of meter means is a pressure meter means for providing a measurement of said blood pressure level;

said pressure meter means comprises a first pressure meter means;

said transducer means further comprises;

a first fluid conduit means for conveying a fluid to said first inflatable pressure cuff means;

said first fluid conduit means being coupled to said first inflatable pressure cuff means and to said first pressure meter means;

said first fluid conduit means being for the purpose of inflating the first cuff means; and

a first fluid reservoir means for controlling said fluid in said first fluid conduit means;

said first fluid reservoir means being coupled to said first pressure meter means.

8. A vital signs monitor as in claim 7 wherein;

said first inflatable pressure cuff means is a first inflatable finger cuff means; and

said first appendage of said patient is a first finger digit of said patient.

9. A vital signs monitor comprising:

a transducing means comprising;

a first and a second transducer means for measuring a plurality of different types of vital signs;

the first transducer means comprising a plurality of first detector means each constructed differently from one another for detecting the plurality of different types of vital signs;

the plurality of first detector means being mounted proximate one another on a first probe body;

the second transducer means comprising a plurality of second detector means each constructed differently from one another for detecting the plurality of different types of vital signs;

the plurality of second detector means being mounted proximate one another on a second probe body;

the first and second probe bodies each being capable of being coupled to a patient;

a meter means;

the meter means providing a measurement of a plurality of test parameters;

being coupled to the plurality of first detector means and to the plurality of second detector means.

10. A vital signs monitor as in claim 9 further comprising:

a memory means for storing a plurality of critical vital sign values;

said memory means being coupled to the meter means; and

an alarm means for providing a warning when any one of said plurality of different types of vital signs falls below said plurality of critical vital sign values stored in said memory means;

said alarm means being coupled to said memory means.

11. A vital signs monitor as in claim 9 wherein:

one of the plurality of first detector means mounted on said first probe body is a first hemoglobin oxygenation detector means for sensing a level of hemoglobin saturated with oxygen in said patient;

one of the plurality of second detector means mounted on said second probe body is a second hemoglobin oxygenation detector means for sensing said level of hemoglobin saturated with oxygen in said patient;

the meter means is constructed for providing a measurement of said level of hemoglobin saturated with oxygen;

the first and second hemoglobin oxygenation detector means each being coupled to the meter means.

12. A vital signs monitor as in claim 9 wherein:

one of the plurality of first detector means mounted on said first probe body is a first pressure detection means for sensing a blood pressure level in said patient;

one of the plurality of second detector means mounted on said second probe body is a second pressure detection means for sensing said blood pressure level in said patient;

said first probe body comprises a first inflatable pressure cuff means capable of substantially enveloping a first appendage of said patient;

said second probe body comprises a second inflatable pressure cuff means capable of substantially enveloping a second appendage of said patient;

the meter means is constructed for providing a measurement of said blood pressure level;

the first and second transducer means further comprise;

a first and a second fluid conduit means for conveying a fluid to the first and second inflatable pressure cuff means;

the first and second fluid conduit means each being coupled to a respective one of the first and second inflatable pressure cuff means and to the meter means;

the first and second fluid conduit means being for the purpose of each inflating a respective one of the first and second inflatable pressure cuff means; and

a first and a second fluid reservoir means for controlling said fluid in the first and second fluid conduit means;

the first and second fluid reservoir means each being coupled to the meter means.

13. A vital signs monitor as in claim 12 wherein;

the first and second inflatable pressure cuff means are a first and a second inflatable finger cuff means; and

the first and second appendages of said patient are a first and a second finger digit of said patient.

14. A vital signs monitor as in claim 9 wherein

the first and second transducer means further comprise a first actuation means for actuating said first probe body and a second actuation means for actuation said second probe body;

said first actuation means being coupled to said first probe body and to said meter means;

said second actuation means being coupled to said second probe body and said meter means;

said first and second actuation means being constructed for respectively actuating said first and second probe bodies in an alternating sequence between two states;

a first state wherein one of said plurality of first detector means senses one of said plurality of different types of vital signs in said patient while said first probe body is actuated and said second probe body is unactuated, and a second state wherein one of said plurality of second detector means senses said one of said plurality of different types of vital signs in said patient while said second probe body is actuated and said first probe body is unactuated.

15. A vital signs monitor as in claim 14 wherein:

one of the plurality of first detector means mounted on said first probe body is a first pressure detection means for sensing a blood pressure level in said patient;

one of the plurality of second detector means mounted on said second probe body is a second pressure detection means for sensing said blood pressure level in said patient;

said first probe body is a first inflatable pressure cuff means capable of substantially enveloping a first appendage of said patient;

said second probe body is a second inflatable pressure cuff means capable of substantially enveloping a second appendage of said patient;

meter means is a first pressure meter means for providing a first measurement of said blood pressure level;

said first actuation means for actuating said first probe body comprises a first fluid conduit and a first fluid reservoir;

said second actuation means for actuating said second probe body comprises a second fluid conduit and a second fluid reservoir;

the first and second fluid conduit means each being coupled to a respective one of the first and second inflatable pressure cuff means and to the meter means;

the first and second fluid reservoir means each being coupled to the meter means for controlling said fluid in the first and second fluid conduit means;

said first and second actuation means being constructed for respectively inflating said first and second pressure cuffs in an alternating sequence between two states;

a first state wherein said first pressure detection means senses said blood pressure level in said patient while said first pressure cuff is inflated and said second pressure cuff is deflated, and a second state wherein said second pressure detection means senses said blood pressure level in said patient while said second probe body is inflated and said first probe body is deflated.

16. A vital signs monitor comprising:

a transducing means comprising;

a first and a second transducer means for measuring a vital sign;

the first transducer means comprising a plurality of first detector means mounted proximate one another on a first probe body; and

the second transducer means comprising a plurality of second detector means mounted proximate one another on a second probe body;

the first and second probe bodies each being capable of being coupled to a patient; and

a plurality of meter means;

each of the meter means providing a measurement of a respective one of a plurality of test parameters;

each of the meter means being coupled to a respective one of the first detector means and to a respective one of the second detector means;

wherein;

one of the plurality of first detector means mounted on said first probe body is a first potential difference detector means for sensing an electric field in said patient;

one of the plurality of second detector means mounted on said second probe body is a second potential difference detector means for sensing said electric field in said patient; and

one of the plurality of meter means is a voltage meter means for providing a measurement of said electric field;

the first and second potential difference detector means each being coupled to said voltage meter means.

17. A vital signals monitor as comprising:

a transducing means comprising;

a first and a second transducer means for measuring a vital sign;

the first transducer means comprising a plurality of first detector means mounted proximate one another on a first probe body;

the second transducer means comprising a plurality of second detector means mounted proximate one another on a second probe body;

the first and second probe bodies each being capable of being coupled to a patient;

a plurality of meter means;

each of the meter means providing a measurement of a respective one of a plurality of test parameters;

each of the meter means being coupled to a respective one of the first detector means and to a respective one of the second detector means;

one of the plurality of first detector means mounted on said first probe body is a first hemoglobin oxygenation detector means for sensing a level of hemoglobin saturated with oxygen in said patient;

one of the plurality of second detector means mounted on said second probe body is a second hemoglobin oxygenation detector means for sensing said level of hemoglobin saturated with oxygen in said patient;

one of the plurality of meter is a hemoglobin oxygenation meter means for providing a measurement of said level of hemoglobin saturated with oxygen;

said hemoglobin oxygenation meter means comprises a first and a second hemoglobin oxygenation meter means;

the first and second hemoglobin oxygenation detector means each being coupled to a respective one of the first and second hemoglobin oxygenation meter means;

one of the plurality of first detector means mounted on said first probe body is a first potential difference detector means for sensing an electric field in said patient;

one of the plurality of second detector means mounted on said second probe body is a second potential difference detector means for sensing said electric field in said patient;

one of the plurality of meter means is a voltage meter means for providing a measurement of said electric field;

the first and second potential difference detector means each being coupled to said voltage meter means;

one of the plurality of first detector means mounted on said first probe body is a first pressure detection means for sensing a blood pressure level in said patient;

one of the plurality of second detector means mounted on said second probe body is a second pressure detection means for sensing said blood pressure level in said patient;

said first probe body comprises a first inflatable pressure cuff means capable of substantially enveloping a first appendage of said patient;

said second probe body comprises a second inflatable pressure cuff means capable of substantially enveloping a second appendage of said patient;

one of the plurality of meter means is a pressure meter means for providing a measurement of said blood pressure level;

said pressure meter means comprises a first and a second pressure meter means;

the first and second transducer means further comprise;

a first and a second fluid conduit means for conveying a fluid to the first and second inflatable pressure cuff means;

the first and second fluid conduit means each being coupled to a respective one of the first and second inflatable pressure cuff means and to a respective one of the first and second pressure meter means;

the first and second fluid conduit means being for the purpose of each inflating a respective one of the first and second inflatable pressure cuff means; and

a first and a second fluid reservoir means for controlling said fluid in the first and second fluid conduit means;

the first and second fluid reservoir means each being coupled to a respective one of the first and second pressure meter means.

18. A vital signs monitor as in claim 17 wherein;

the first and second inflatable pressure cuff means are a first and a second inflatable finger cuff means; and

the first and second appendages of said patient are a first and a second finger digit of said patient.

19. A vital signs monitor as in claim 18 wherein:

the first and second pressure detection means each comprise;

a first light emitting device which each emit radiation through a respective one of the first and second finger digits of said patient;

a first light detector which receives transmitted radiation from said first light emitting device;

the first and second hemoglobin oxygenation detector means each comprise;

a second light emitting device which each emit radiation through a respective one of the first and second finger digits of said patient; and

a second light detector which receives transmitted radiation from said second light emitting device; and

the first and second potential difference detector means each comprise;

an electrode means for obtaining an epidermal voltage.

20. A method for monitoring a vital sign of a patient while reducing resulting tissue damage to said patient, which comprises the steps of:

(a) selecting a first finger digit of said patient;

(b) selecting a second finger digit of said patient;

(c) inserting said first finger digit into a first inflatable finger cuff means on which is mounted a plurality of first detector means, wherein one of the first detector means is a first pressure detection means for sensing a blood pressure level in said patient;

(d) inserting said second finger digit into a second inflatable finger cuff means on which is mounted on a plurality of second detector means, wherein one of the second detector means is a second pressure detection means for sensing said blood pressure level in said patient;

(e) employing said first and second inflatable finger cuff means in an alternating sequence between two states;

a first state wherein said first detector means senses said blood pressure level in said first finger digit while said first finger cuff means is inflated and said second finger cuff means is deflated to reduce tissue damage in said patient, and a second state wherein said second detector means senses said blood pressure level in said patient while said second finger cuff means is inflated and said first finger cuff means is deflated to reduce tissue damage in said patient.

21. A method of increasing data integrity in monitoring said vital sign of said patient as in claim 20, wherein:

said first finger digit is selected from one hand of said patient and said second finger digit is selected from an opposing hand of said patient.