33 results about "Arterial tree" patented technology

The methods and systems for estimating cardiac output and total peripheral resistance include observing arterial blood pressure waveforms to determine intra-beat and inter-beat variability in arterial blood pressure and estimating from the variability a time constant for a lumped parameter beat-to-beat averaged Windkessel model of the arterial tree. Uncalibrated cardiac output and uncalibrated total peripheral resistance may then be calculated from the time constant. Calibrated cardiac output and calibrated total peripheral resistance may be computed using calibration data, assuming an arterial compliance that is either constant or dependent on mean arterial blood pressure. The parameters of the arterial compliance may be estimated in a least-squares manner.

The disclosure relates to an image processing method for estimating a brain shift in a patient, the method involving: the processing of a three-dimensional image of the brain of a patient, acquired before a surgical operation, in order to obtain a reference cerebral arterial tree structure of the patient; the processing of three-dimensional images of the brain of the patient, acquired during the operation, in order to at least partially reconstitute a current cerebral arterial tree structure of the patient; the determination from the combination of the reference and current cerebral arterial tree structures, of a field of shift of the vascular tree representing the shift of the current vascular tree in relation to the reference vascular tree; the application of the determined field of shift of the vascular tree to a biomechanical model of the brain of the patient in order to estimate the brain shift of the patient; and the generation, from the estimated brain shift, of at least one image of the brain of the patient, in which the brain shift is compensated.

The invention discloses a method and a device for detecting the body's hemodynamic response in external counterpulsation therapy. The detection method includes: collecting physiological information of a sampler, and performing blood vessel and blood flow state data before and during external counterpulsation therapy. Acquisition; segment the arterial tree based on the arterial tree structure model, collect the length and radius data of each blood vessel segment of healthy volunteers, set the baseline reference value, and construct the geometric solution model of the arterial tree; calculate and set the boundary conditions, correction and calibration conditions, and Based on the pulse wave transmission theory and model, the flow rate and pressure pulse wave distribution at each position of the arterial tree are solved and calculated, and the blood perfusion and blood pressure levels of target blood vessel segments and organs before and during external counterpulsation treatment are calculated. The invention can non-invasively, real-time and effectively analyze the immediate hemodynamic effect of external counterpulsation intervention treatment, and solves the technical bottleneck that the current external counterpulsation therapy lacks an effective instant hemodynamic effect evaluation method.