Device and method for combined continuous non-invasive measurement of blood pressure and pulse oximetry (SpO2)

Patent metadata

Field	Value
Publication number	US-9839362-B2
Application number	US-201113995348-A
Country	US
Kind code	B2
Filing date	Dec 12, 2011
Priority date	Dec 23, 2010
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

An apparatus and method for measuring at least two patient parameters is provided. A first cuff includes a first inflatable bladder, a first light emitting device and a first sensor that senses light data for use in calculating at least two patient parameters. A second cuff includes a second inflatable bladder, a second light emitting device and a second sensor that senses light data for use in calculating the at least two patient parameters. A controller is coupled the first and second sensors and when the controller causes the bladder of one of the first and second cuffs to inflate, the sensor of the one of the first and second cuffs sensing first light data used in determining a first of the at least two patient parameters and the sensor of the other of the one of first and second cuffs simultaneously senses second light data used in determining of a second of the at least two patient parameters.

First claim

I claim:

1. An apparatus for combined continued non-invasive measurement of blood pressure and pulse oximetry, the apparatus comprising:
a first cuff including a first inflatable bladder, a first light emitting device and a first sensor that senses light data, the first cuff which can releasably receive a first finger on a first hand of a user for use in calculating at least a first patient parameter of a first type and a second patient parameter of a second type, said first type being different from said second type;
a second cuff including a second inflatable bladder, a second light emitting device and a second sensor that senses light data, the second cuff which can releasably receive a second finger on the first hand of the user for use in calculating the at least first and second patient parameters; and
a controller coupled to the first and second sensors, wherein the controller is configured to alternatingly cause the bladder of one of the first and second cuffs to inflate while the other is not pressurized, the sensor of the one of the first and second cuffs is configured to sense first light data, the first light data being received by said controller from the sensor, the controller being configured to derive said first patient parameter based on the first light data from the pressurized one of the first and second cuffs, the sensor of the other of the first and second cuffs is configured to simultaneously sense second light data used by said controller to determine said second patient parameter from the depressurized one of the first and second cuffs;
wherein said controller is configured to maintain the one of the first and second cuffs in a pressurized state for a predetermined duration and, at the expiration of the predetermined duration, to automatically depressurize the one of the first and second cuffs and to automatically pressurize the other of the first and second cuffs.

2. The apparatus as recited in claim 1 , wherein
said first and second light emitting devices emit a first type of light for use in calculating the first patient parameter and a second type of light for use in calculating the second patient parameter.

3. The apparatus as recited in claim 2 , wherein
the first and second sensors each include a photodetector configured to detect an amount of the first type of light and the second type of light.

4. The apparatus of claim 2 , wherein
the first type of light includes light emitted at a first wavelength and the second type of light includes sequential pulses of light having different wavelengths, a first pulse being the light emitted at the first wavelength and a second, sequential pulse being light emitted at a second different wavelength.

5. The apparatus of claim 2 , wherein the first type of light is red light for use in calculating the first patient parameter and the second type of light includes red light and infrared light for use in calculating the second patient parameter.

6. The apparatus of claim 1 , further comprising
a pressure source connected to respective inflatable bladders in respective first and second cuffs and configured to pressurize a respective one of the first and second cuffs upon receipt of a control signal generated by the controller.

7. The apparatus of claim 1 , wherein
in response to depressurizing the one of the first and second cuffs, the controller is configured to automatically cause the first sensor in the one of the first and second cuffs to sense light data for use in calculating the second patient parameter, and
in response to pressurizing the other of the first and second cuffs, the controller is configured to automatically cause the second sensor to sense light data for use in calculating the first patient parameter.

8. The apparatus of claim 1 , wherein
said controller is further configured to use the light data sensed by the first sensor to calculate said second patient parameter and to simultaneously calculate first and second patient parameters using the light data sensed by the first sensor in the one of the first and second cuffs that has been inflated.

9. The apparatus of claim 1 , wherein
said controller causes the light emitting device in the one of the first and second cuffs to emit successive pulses of light, wherein a first pulse of light has a first wavelength and a second pulse of light has a second wavelength.

10. The apparatus of claim 9 , wherein
the controller uses light data derived from the first pulse of light to calculate the first patient parameter, and uses light data derived from the second pulse of light, in conjunction with first pulse light data, to determine the second patient parameter.

11. The apparatus of claim 1 , wherein
in response to determining data representing the second patient parameter in the one of the first and second cuffs, the controller at least one of (a) modifies a pressure level in the one of the first and second cuffs; (b) depressurizes the one of the first and second cuffs and pressurizes the other of the first and second cuffs; and (c) generates an alert signal indicating that the second patient parameter has reached a threshold level.

12. The apparatus as recited in claim 1 , wherein
the first and second cuffs are formed from a non rigid material and are adjustably connected to respective adjacent digits of the patient.

13. The apparatus as recited in claim 1 , wherein
the first and second patient parameters include data representing (a) an intra arterial blood pressure and (b) a blood oxygen saturation level.

14. The apparatus as recited in claim 1 , wherein
the second cuff is positioned around a second finger adjacent the first finger on the first hand of the user.

15. A method for combined continued non-invasive simultaneously measurement of blood pressure and pulse oximetry, the method comprising:
pressuring alternatingly a respective cuff of a cuff pair positioned on adjacent digits of a patient while the other cuff is not pressurized such that one of the cuffs is always inflated or being inflated while the other cuff is deflated or being deflated, each cuff of the cuff pair including a light emitting device and sensor that can sense light data for use in determining a first patient parameter of a first type from the pressurized respective cuff and a second patient parameter of a second type from the depressurized respective cuff, said first type being different from said second type;
sensing first light data used in determining said first patient parameter using the sensor in the respective pressurized cuff and determining data representing the first patient parameter based on the first light data;
simultaneously sensing second light data used in determining said second patient parameter using the sensor in the other of the respective cuff, the other of the respective cuff being unpressurized and determining data representing the second patient parameter based on the second light data; and
outputting data representing the first and second patient parameters for use by a healthcare professional charged with monitoring the patient.

16. The method of claim 15 , further comprising the activity of
automatically depressurizing the respective cuff of the cuff pair after a predetermined time period and sensing second light data in the respective cuff for use in determining the second patient parameter; and
automatically pressurizing the other cuff of the respective cuff pair and sensing first light data for use in determining the first patient parameter.

17. The method of claim 15 , wherein the activity of sensing first light

Assignees

• Fournier Donald
• Draeger Medical Systems Inc

Inventors

• Fournier Donald

Classifications

• A61B5/0205 Primary

  Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition · CPC title

• A61B5/6843

  Monitoring or controlling sensor contact pressure · CPC title

• A61B5/02241

  of small dimensions, e.g. adapted to fingers · CPC title

• A61B5/14552

  Details of sensors specially adapted therefor · CPC title

• A61B5/6826

  Finger · CPC title