Improved blood pressure monitor and method

A blood pressure and real-time monitoring technology, applied in blood pressure measuring devices, blood flow measuring devices, sensors, etc., can solve the problem of unused arterial lines

Inactive Publication Date: 2015-09-02
日本林电器株式会社
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  • Summary
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Problems solved by technology

Given these risks, arterial lines are not used for routine blood pressure monitoring

Method used

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Embodiment Construction

[0011] As an anesthesiologist, I have identified significant problems associated with monitoring blood pressure in critical situations. One available approach has an inflatable finger cuff intended to provide data on blood pressure; however it has been reported that in some patients, especially critically ill or pediatric patients, the signal may be difficult to detect. These data are not as reliable as invasive blood pressure data.

[0012] The use of an inflatable finger cuff with a photoplethysmograph enables continuous monitoring of arterial pressure by generating a waveform that correlates with blood pressure. However, fingertip measurements often fail due to the patient's hypothermia during the procedure and in response to peripheral vasoconstriction (and hypotension). Furthermore, these systems are complex and do not function well under hypotensive conditions such as shock because they rely on bleeding from fingers that are compromised in the hypotensive state.

[001...

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Abstract

A method is provided for noninvasive, continuous, real-time monitoring of a patient's arterial blood pressure using Doppler probes and a blood pressure cuff for measurement of a patient's systolic and diastolic blood pressures at a major distal artery. A continuous Doppler blood flow velocity measurement is used to generate a waveform signal correlating to a cuff's measurements of systolic and diastolic pressures. In addition, a method determines cerebral blood perfusion by providing at least two Doppler probes, one of which is placed at a distal artery with a blood pressure cuff and another of which is placed over the carotid artery or the middle cerebral artery. An algorithm calculates systolic and diastolic pressures at the distal artery and at the carotid artery or the middle cerebral artery as a function of the continuously measured Doppler blood flow velocities.

Description

technical field [0001] The present invention relates to continuous, non-invasive blood pressure monitoring using a combination of a blood pressure cuff and a Doppler ultrasound probe. Background technique [0002] The main method of clinical measurement of blood pressure is non-invasive auscultation using a stethoscope and a sphygmomanometer cuff. The practitioner listens to the brachial artery with a stethoscope while slowly releasing the pressure in the cuff. Systolic blood pressure is the pressure at which the first "hiss" of blood flow in the artery is heard. Diastolic blood pressure is the pressure when no sound is heard. [0003] Another non-invasive method for determining blood pressure is the use of a sphygmomanometer cuff (oscilloscope) with an electronic sensor to measure the oscillations. An algorithm is used to calculate systolic and diastolic values. This method is considered less accurate than auscultation, although it is easier to use. However, no continu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/021
CPCA61B5/7289A61B5/0225A61B5/022A61B8/488A61B8/06A61B5/02208A61B5/02225A61B5/0285A61B5/4064A61B2505/01A61B2505/03A61B2505/05A61B8/04
Inventor 勒·泰
Owner 日本林电器株式会社
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