Constitutive equation for non-invasive blood pressure measurement systems and methods
AssigneeStryker Corporation
InventorClinton T. Siedenburg
Life of this patent
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Abstract
The disclosed devices, systems and methods measure non-invasive blood pressure in a patient. Energy emissions, such as ultrasound or light, are emitted into tissues of the patient. The emitted energy reflects from various tissues, such as flowing blood and vessels, and can be detected, or received, to generate a reflected energy signal or data. The reflected energy can be processed, such as by using a constitutive equation, to calculate the blood pressure.
Claims20
A medical device, comprising:
- a sensor comprising:
- an emitter configured to emit a signal toward a blood vessel of a patient;
- a detector configured to detect a reflection of the signal from the blood vessel of the patient;
- and
- a processor configured to:
- determine, by analyzing the reflection of the signal from the blood vessel of the patient, a systolic geometric parameter of the blood vessel during a systole phase of a cardiac cycle;
- determine, by analyzing the reflection of the signal from the blood vessel of the patient, a diastolic geometric parameter of the blood vessel during a diastole phase of the cardiac cycle;
- determine a quotient of the diastolic geometric parameter over a difference between the systolic geometric parameter and the diastolic geometric parameter;
- and
- determine a pulse wave velocity by multiplying the quotient by a change in blood flow in the blood vessel.
A method of measuring non-invasive blood pressure (NIBP) in a patient without restricting a blood vessel of the patient, comprising:
- emitting a signal toward a single location of a blood vessel of the patient;
- receiving a reflection of the signal from the single location of the blood;
- determining, by analyzing the reflection of the signal, a systolic geometric parameter of the blood vessel during a systole phase of a cardiac cycle;
- determining, by analyzing the reflection of the signal, a diastolic geometric parameter of the blood vessel during a diastole phase of the cardiac cycle;
- determining a quotient of the diastolic geometric parameter over a difference between the systolic geometric parameter and the diastolic geometric parameter;
- and
- determining a pulse wave velocity by multiplying the quotient by a change in blood flow in the blood vessel.
A medical device, comprising:
- a sensor comprising:
- an emitter configured to emit a signal towards a single location of a blood vessel of a patient;
- and
- a detector configured to detect a reflection of the signal from the single location of the blood vessel;
- and
- a processor configured to:
- determine, by analyzing a portion of the reflection of the signal detected by the detector at a first time associated with a systole phase of a cardiac cycle, a systolic geometric parameter of the blood vessel during the systole phase;
- determine, by analyzing a portion of the reflection of the signal detected by the detector at a second time associated with a diastole phase of the cardiac cycle, a diastolic geometric parameter of the blood vessel during the diastole phase;
- determine a quotient of the diastolic geometric parameter over a difference between the systolic geometric parameter and the diastolic geometric parameter;
- determine a change in blood flow in the blood vessel by determining a difference between a systolic blood flow in the blood vessel and a diastolic blood flow in the blood vessel;
- and
- determine a pulse wave velocity by multiplying the quotient by the change in the blood flow in the blood vessel.
Dependencies are inferred from the claim text.