Systems and methods for recalibrating a non-invasive blood pressure monitor

• US 9,301,697 B2
• Filed: 09/30/2008
• Issued: 04/05/2016
• Est. Priority Date: 09/30/2008
• Status: Active Grant

• Current Assignee: Nellcor Puritan Bennett Ireland
• Original Assignee: Nellcor Puritan Bennett Ireland
• Inventors: Baker, Clark R. Jr., Watson, James Nicholas, Addison, Paul Stanley
• Primary Examiner(s): NEGIN, RUSSELL SCOTT
• Application Number:
  US12/242,858
• Publication Number:
  US 20100081944A1
• Time in Patent Office: 2,744 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: A61B 2560/0223 of calibration, e.g. protocols for calibrating sensors
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/02125 of pulse wave propagation time
• CPC Class Codes: A61B 5/022 by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
• CPC Class Codes: A61B 5/02225 using the oscillometric method
• CPC Class Codes: A61B 5/1455 using optical sensors, e.g. spectral photometrical oximeters
• CPC Class Codes: A61B 5/7239 using differentiation including higher order derivatives
• CPC Class Codes: G16H 15/00 ICT specially adapted for medical reports, e.g. generation or transmission thereof
• CPC Class Codes: G16H 40/40 for the management of medical equipment or devices, e.g. scheduling maintenance or upgrades
• CPC Class Codes: G16H 40/63 for local operation

Abstract

Techniques for non-invasive blood pressure monitoring are disclosed. Data corresponding to a patient may be received from a hospital information system. The data may include, for example, drug administration data, medical procedure data, medical equipment data, or a combination thereof. Whether a blood pressure monitoring system needs to be recalibrated may be determined, based at least in part on the received data. If it is determined that the blood pressure monitoring system needs to be recalibrated, the recalibration may be performed and at least one blood pressure measurement of the patient may be computed using the recalibrated blood pressure monitoring system.

Claims

1. A method for monitoring blood pressure, the method comprising:

receiving at a blood pressure monitoring system, from a hospital information system, data corresponding to a patient that is not determined based on a measured physiological parameter of the patient, wherein the data identifies a drug administration event;

determining, based on the received data and an expected effect of the drug administration event on the patient'"'"'s arterial compliance, whether a blood pressure monitoring system needs to be recalibrated;

recalibrating the blood pressure monitoring system if it is determined that the blood pressure monitoring system needs to be recalibrated; and

computing at least one blood pressure measurement of the patient using the recalibrated blood pressure monitoring system.

2. The method of claim 1 wherein receiving the data corresponding to the patient further comprises receiving data selected from the group consisting of:

medical procedure data and medical equipment data.

3. The method of claim 1 further comprising:

determining an identifier corresponding to a drug to be administered to the patient based at least in part on a scan of a tag corresponding to the drug; and

storing the identifier in the hospital information system as part of the data corresponding to the patient.

4. The method of claim 1 wherein computing the at least one blood pressure measurement comprises:

detecting a first photoplethysmograph (PPG) signal;

detecting a second PPG signal;

measuring a time difference between the first and second PPG signals; and

generating the at least one blood pressure measurement based at least in part on the measured time difference.

5. The method of claim 4 wherein determining whether the blood pressure monitoring system needs to be recalibrated is further based at least in part on an item selected from the group comprising:

the computed at least one blood pressure measurement and at least one characteristic of the first and second PPG signals.

6. The method of claim 1 wherein determining whether the blood pressure monitoring system needs to be recalibrated comprises scheduling a recalibration in response to determining that the blood pressure monitoring system needs to be recalibrated.

7. The method of claim 6 wherein:

the data received from the hospital information system is indicative of a drug to be administered to the patient; and

scheduling the recalibration is based at least in part on at least one characteristic of the drug to be administered.

8. The method of claim 1 wherein recalibrating the blood pressure monitoring system comprises:

accessing a reference blood pressure measurement; and

computing at least one mathematical constant based on the accessed reference blood pressure measurement, wherein computing the at least one blood pressure measurement is based at least in part on the computed at least one mathematical constant.

9. The method of claim 1 wherein the data that identifies the drug administration event comprises at least one of:

drug identity data, actual or expected drug administration time data, drug dosage data, and method of drug delivery data.

10. The method of claim 1 wherein the data that identifies the drug administration event comprises actual or expected drug administration time.

11. A monitoring system comprising:

a hospital information system operable to store data corresponding to a patient; and

a blood pressure monitoring system coupled to a hospital information system, comprising a processor, operable to;

receive the data from the hospital information system that is not determined based on a measured physiological parameter of the patient, wherein the data identifies a drug administration event;

determine, based on the received data and an expected effect of the drug administration event on the patient'"'"'s arterial compliance, whether the blood pressure monitoring system needs to be recalibrated;

recalibrate the blood pressure monitoring system if it is determined that the blood pressure monitoring system needs to be recalibrated; and

compute at least one blood pressure measurement of the patient using the recalibrated blood pressure monitoring system.

12. The monitoring system of claim 11 wherein the hospital information system is further operable to receive data selected from the group consisting of:

medical procedure data and medical equipment data.

13. The monitoring system of claim 11 wherein the hospital information system is further operable to:

determine an identifier corresponding to a drug to be administered to the patient based at least in part on a scan of a tag corresponding to the drug; and

store the identifier as part of the data corresponding to the patient.

14. The monitoring system of claim 11 further comprising:

a first sensor operable to detect a first photoplethysmograph (PPG) signal; and

a second sensor operable to detect a second PPG signal, wherein the blood pressure monitoring system is further operable to;

measure a time difference between the first and second PPG signals; and

generate the at least one blood pressure measurement based at least in part on the measured time difference.

15. The monitoring system of claim 14 wherein the blood pressure monitoring system is further operable to determine whether the blood pressure monitoring system needs to be recalibrated based at least in part on an item selected from the group comprising:

the computed at least one blood pressure measurement and at least one characteristic of the first and second PPG signals.

16. The monitoring system of claim 11 wherein the blood pressure monitoring system is further operable to schedule a recalibration in response to determining that the blood pressure monitoring system needs to be recalibrated.

17. The monitoring system of claim 16 wherein:

the hospital information system is further operable to store data indicative of a drug to be administered to the patient; and

the blood pressure monitoring system is further operable to schedule the recalibration based at least in part on at least one characteristic of the drug to be administered.

18. The monitoring system of claim 11 wherein the blood pressure monitoring system is further operable to:

access a reference blood pressure measurement;

compute at least one mathematical constant based on the accessed reference blood pressure measurement; and

compute the at least one blood pressure measurement based at least in on the at least one mathematical constant.

19. A non-transitory computer-readable medium for use in determining blood pressure, the non-transitory computer-readable medium having computer program instructions recorded thereon, wherein the computer program instructions, when executed by a blood pressure monitoring system comprising a processor, cause the blood pressure monitoring system to:

receive, from a hospital information system, data corresponding to a patient that is not determined based on a measured physiological parameter of the patient, wherein the data identifies a drug administration event;

determine, based on the received data and an expected effect of the drug administration event on the patient'"'"'s arterial compliance, whether the blood pressure monitoring system needs to be recalibrated;

recalibrate the blood pressure monitoring system if it is determined that the blood pressure monitoring system needs to be recalibrated; and

compute at least one blood pressure measurement of the patient using the recalibrated blood pressure monitoring system.

20. The non-transitory computer-readable medium of claim 19, wherein the received data is further selected from the group consisting of:

medical procedure data and medical equipment data.

21. The non-transitory computer-readable medium of claim 19, wherein the computer program instructions, when executed on the blood pressure monitoring system, further cause the blood pressure monitoring system to schedule a recalibration that is determined to be necessary.

22. The non-transitory computer-readable medium of claim 21, wherein the computer program instructions, when executed on the blood pressure monitoring system, further cause the blood pressure monitoring system to:

receive from the hospital information system data indicative of a drug to be administered to the patient; and

schedule the recalibration based at least in part on at least one characteristic of the drug to be administered.