Abstract: Methods and systems are described for detecting the likelihood of patent ductus arteriosus (PDA) in an infant using electrocardiogram and photoplethysmographic pulse signals obtained from the upper body and foot of the infant.

Abstract: Methods and systems are described for detecting the likelihood of patent ductus arteriosus (PDA) in an infant using electrocardiogram and photoplethysmographic pulse signals obtained from the upper body and foot of the infant.

Abstract: Methods and systems are described for detecting the likelihood of patent ductus arteriosus (PDA) in an infant using electrocardiogram and photoplethysmographic pulse signals obtained from the upper body and foot of the infant.

Abstract: Methods and systems are described for detecting the likelihood of patent ductus arteriosus (PDA) in an infant using electrocardiogram and photoplethysmographic pulse signals obtained from the upper body and foot of the infant.

Abstract: Methods and systems are described for detecting the likelihood of patent ductus arteriosus (PDA) in an infant using electrocardiogram and photoplethysmographic pulse signals obtained from the upper body and foot of the infant.

Abstract: Methods and systems are described for detecting the likelihood of an aortic coarctation in an infant using photoplethysmographic pulse signals obtained from the hand and foot of the infant.

Abstract: Methods and systems are described for detecting the likelihood of patent ductus arteriosus (PDA) in an infant using electrocardiogram and photoplethysmographic pulse signals obtained from the upper body and foot of the infant.

Abstract: Methods and systems are described for detecting the likelihood of an aortic coarctation in an infant using photoplethysmographic pulse signals obtained from the hand and foot of the infant.

Abstract: Systolic blood pressure of a subject is determined by application of monotonic changing pressure conditions over a region of an organ of the subject, simultaneous illumination of a tissue in the pressurized organ with light and measurement of optical data indicative of passage of the light through the tissue and of pressure data indicative of the pressure being applied over said region of said organ. At least one pulsatile and at least one baseline component are determined from the measured optical data and changes are then identified in each of the components, said changes indicative that the pressure applied over the organ is smaller than systolic blood pressure of the subject. The systolic blood pressure of the subject may be determined as a maximal applied pressure at which at least one of the changes in the pulsatile component and the changes in the baseline component started to appear.

Abstract: A method for obtaining diagnostic information relating to the lungs of a subject includes directing into tissue of the lungs of the subject light of a first wavelength and detecting part of the light that has passed primarily through microcirculatory tissue of the lungs and generating a signal which is a function of intensity of the detected light. The signal is then processed to derive a PPG curve for pulmonary microcirculatory arteries. The method is implemented using various locations for a light source and a detector, including various combinations of positioning on the thoracic wall, insertion into the esophagus, and in some cases, insertion of a probe through the thoracic wall to a position adjacent to the pulmonary pleura. Use of two different wavelengths allows derivation of mixed venous blood oxygen saturation.

Abstract: The present invention relates to cuff-based method for the measurement of systolic blood pressure (SBP) by measuring photoplethysmographic (PPG) signals in peripheral blood vessels distal to the cuff and to a method for cuffless measurement of SBP by analyzing PPG signals in peripheral blood vessels, after suitable calibration by the cuff-based PPG method for the measurement of SBP.

Abstract: There is provided an apparatus for measuring the refractive index of fluids. The apparatus comprises a substantially U-shaped sensor rod made of a transparent material and is submersible in the fluid. The bent portion of the sensor rod has a diameter of curvature at least two times larger than the diameter of the sensor rod, and chosen so as to optimize sensitivity for a given range of indices. The two ends of the U-shaped sensor rod are connectable to a housing and a light source inside the housing has optical access to the face of one of the sensor-rod ends. A light detector means also disposed inside the housing has optical access to the face of the other one of the sensor rod ends.

Abstract: A probe for regional blood flow measurement, comprising a housing of low thermal conduction and heat capacity, at least one face of which is adapted to make contact with a tissue region investigated, the face being provided with a recessed portion, a relatively thin plate made of a material of high thermal conductivity, located in the recess and being substantially flush with the tissue-contacting face of the housing, a temperature-sensing means in thermal contact with the plate and adapted to transfer temperature-related information to the outside of the housing, wherein the respective configurations of the plate and the housing are such as to minimize the area of contact between them relative to the area of contact between the plate and the tissue region, in order to minimize heat flow between the plate and the housing. A method for carrying out regional blood flow measurements is also disclosed.