Device and method for noninvasive continuous determination of physiologic characteristics

a non-invasive, continuous technology, applied in the field of continuous, non-invasive determination devices, can solve the problems of increased patient mortality risk, inability of lungs and heart to supply the bloodstream with life-giving oxygen, and patient distress, etc., to achieve simple and quick operation, improve the means of determining, and be convenient for personal home use.
US20050131306A9Inactive Publication Date: 2005-06-16WOOLSTHORPE TECH
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
WOOLSTHORPE TECH
Publication Date
2005-06-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention comprises devices for noninvasively monitoring physiological characteristics of a patient's blood. Generally, probes having radiation emitters and detectors are used to determine absorbance of blood within the patient's tissue to determine various blood parameters. The device also has either a position sensor for determining the position of the probe with respect to the patient's heart or a movement generator for altering the position of the probe with respect to the patient's heart. The invention also comprises methods for noninvasively monitoring the physiological characteristics. In one embodiemnt, induced positional changes create differential hydrostatic pressures to facilitate measurement of blood parameters by absorbance. In a second embodiment, delays in pulse arrival times in coupled organs or members on opposite sides of the body are measured to determine cardiac output. The two methods are such that they can advantageously be used together.
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Description

FIELD OF THE INVENTION

[0001] The present invention relates generally to noninvasive methods of quantitatively determining various physiologic parameters relating to cardiovascular and respiratory function. More particularly, the invention relates to a method and apparatus for continuous, noninvasive determination of: arterial blood pressure, venous pressure, arterial oxygen saturation, venous oxygen saturation, arterial pulse wave velocity, aortic pulse wave velocity, aortic pulse flow velocity, cardiac stroke volume, cardiac output, heart rate, and respiratory rate. BACKGROUND OF THE INVENTION

[0002] Critically ill and seriously injured patients require constant care and attention. Doctors, nurses, and hospital technicians need a continuous flow of information about the many patients under their care. Heart rate and blood pressure measurements are two primary vital signs that indicate the health of patients under their care. When these two common indices of wellness fall below nor...

Claims

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