Systems and methods for non-invasive determination of blood pressure
Methods and systems for determining blood pressure from a pressure signal are disclosed. A patient's blood pressure may be determined by analyzing features of a wavelet transformation of a pressure signal obtained during an occlusion procedure. Ridges in a scalogram of the transformed signal may be identified and used to determine an envelope of a pressure oscillation signal, to which oscillometric blood pressure determination techniques may be applied.
1. A method for determining a blood pressure measurement, comprising:
receiving, from a sensor, an electronic signal responsive to an occluding device applied to a patient;
using processor equipment for:
transforming the electronic signal into a transformed signal based at least in part on a continuous wavelet transformation,
generating a scalogram based at least in part on the transformed signal, wherein the scalogram comprises 3-dimensional information,
identifying, within the scalogram, a ridge indicative of the patient's blood flow as a function of time, and
determining a blood pressure measurement based at least in part on the identified ridge; and
outputting the blood pressure measurement to an output device.
2. The method of claim 1 , further comprising applying a variable occluding pressure to a patient using the occluding device.
3. The method of claim 1 , wherein the sensor is a pressure transducer associated with the occluding device.
4. The method of claim 1 , wherein the blood pressure measurement comprises at least one of a systolic blood pressure, a diastolic blood pressure and a mean arterial pressure.
5. The method of claim 1 , further comprising using processor equipment for determining an oscillation envelope based at least in part on the identified ridge, wherein determining a blood pressure measurement is based at least in part on the oscillation envelope.
6. The method of claim 5 , wherein the oscillation envelope is based at least in part on a projection of the identified ridge.
7. The method of claim 1 , wherein determining a blood pressure measurement is further based at least in part on a maximum amplitude of the identified ridge.
8. A system for determining a blood pressure measurement, comprising:
an occluding device capable of being applied to a patient;
a sensor, coupled to the occluding device, that outputs an electronic signal responsive to the occluding device when the occluding device is applied to the patient;
processor equipment, coupled to the sensor, the processor equipment being capable of:
transforming the electronic signal into a transformed signal based at least in part on a continuous wavelet transformation,
generating a scalogram based at least in part on the transformed signal, wherein the scalogram comprises 3-dimensional information,
identifying, within the scalogram, a ridge indicative of the patient's blood flow as a function of time,
determining a blood pressure measurement based at least in part on the identified ridge; and
an output device, coupled to the processor equipment, for outputting the blood pressure measurement.
9. The system of claim 8 , wherein the occluding device is capable of applying a variable occluding pressure to a patient.
10. The system of claim 8 , wherein the sensor is a pressure transducer associated with the occluding device.
11. The system of claim 8 , wherein the blood pressure measurement comprises at least one of a systolic blood pressure, a diastolic blood pressure and a mean arterial pressure.
12. The system of claim 8 , wherein the processor equipment is further capable of determining an oscillation envelope based at least in part on the identified ridge, wherein determining a blood pressure measurement is based at least in part on the oscillation envelope.
13. The system of claim 12 , wherein the oscillation envelope is based at least in part on a projection of the identified ridge.
14. The system of claim 8 , wherein determining a blood pressure measurement is further based at least in part on a maximum amplitude of the identified ridge.
15. Non-transitory computer-readable medium for use in determining a blood pressure measurement, the computer-readable medium having computer program instructions recorded thereon for:
receiving, from a sensor, an electronic signal responsive to an occluding device applied to a patient,
transforming the electronic signal into a transformed signal based at least in part on a continuous wavelet transformation,
generating a scalogram based at least in part on the transformed signal, wherein the scalogram comprises 3-dimensional information,
identifying, within the scalogram, a ridge indicative of the patient's blood flow as a function of time,
determining a blood pressure measurement based at least in part on the identified ridge, and
outputting the blood pressure measurement to an output device.
16. The non-transitory computer-readable medium of claim 15 , further having computer program instructions recorded thereon for directing the occluding device to apply a variable occluding pressure to a patient.
17. The non-transitory computer-readable medium of claim 15 , wherein the sensor is a pressure transducer associated with the occluding device.
18. The non-transitory computer-readable medium of claim 15 , wherein the blood pressure measurement comprises at least one of a systolic blood pressure, a diastolic blood pressure and a mean arterial pressure.
19. The non-transitory computer-readable medium of claim 15 , further having computer program instructions recorded thereon for determining an oscillation envelope based at least in part on the identified ridge, wherein determining a blood pressure measurement is based at least in part on the oscillation envelope.
20. The non-transitory computer-readable medium of claim 19 , wherein the oscillation envelope is based at least in part on a projection of the identified ridge.