11 results about "Peripheral resistance" patented technology

An electronic device and an apparatus for estimating blood pressure are provided. The apparatus may include a memory storing one or more instructions and a processor configured to execute the one or more instructions to extract a cardiac output (CO) feature, a first candidate total peripheral resistance (TPR) feature, and a second candidate TPR feature from a biosignal; determine one of the first candidate TPR feature and the second candidate TPR feature as a TPR feature based on a change direction of the CO feature and a change direction of the first candidate TPR feature between a blood pressure measurement time and a calibration time; and estimate blood pressure based on the TPR feature and the CO feature.

The disclosure describes a system and a method for applying a gradient of external compressive forces on the body of a person, in a manner analogous to how water exerts hydrostatic forces on the body of a person immersed in water. According to an embodiment, the system may be a chair or a suit and is applicable for effecting physiological changes in the body such as increased diuresis and / or amniotic fluid levels, preeclampsia treatment in pregnant women, reduced hypertension, shift in fluids from interstitial space into intravascular compartment, increased venous return from lower extremities, reduced sympathetic tone and total peripheral resistance, reduced work load on the heart, reduced motion sickness, and the like.

The invention belongs to the technical field of ultrasonic monitoring, and discloses a Doppler ultrasonic monitoring method and device for intracranial pressure, and the method comprises the steps: employing an ultrahigh frequency Doppler ultrasonic probe to measure the pulse wave of a neck artery; by analyzing the pulse wave map, pulse wave peripheral resistance parameters closely related to intracranial pressure are extracted; the quantitative relation between the pulse wave parameters and the intracranial pressure is obtained through comparison with the peripheral resistance parameters under the real intracranial pressure condition; 24-hour intracranial pressure monitoring of a patient is realized by continuously acquiring the pulse wave parameters of the neck artery. The technology provided by the invention is used for monitoring the intracranial pressure and also can give an alarm to the occurrence of cerebral apoplexy. The device designed by the invention is small in size, light in weight and convenient to wear, does not influence the living of a patient, and can really realize 24-hour noninvasive monitoring of the intracranial pressure.

The present invention relates to a flow regulating valve with a continuously variable diameter for simulating peripheral resistance of blood vessels, comprising an upper valve body, blades, and a lower base plate; a circle of multiple first-level guide columns is provided at the lower part of the upper valve body; the number of blades is the same as the first-level guide columns; a first-level guide groove adapted to the first-level guide column is provided at the upper part of each blade, so that: the first-level guide column is limited to be located in the first-level guide groove and can change its relative position in the first-level guide groove; a second-level guide column is provided at the lower part of each blade; a plurality of second-level guide grooves, the same number as the blades, are provided at the upper part of the lower base plate, so that: the second-level guide column is limited to be located in the second-level guide groove and can change its relative position in the second-level guide groove; by rotating the upper valve body, force is applied to the first-level guide groove through the first-level guide column, and while changing the relative position of the first-level guide column in the first-level guide groove, the blade is forced to slide along the second-level guide groove, thereby realizing adjustment of the diameter of the central through hole.

The application provides a hemodynamic parameter estimation method and device based on a non-invasive blood pressure waveform, equipment and a medium, which can be applied to the technical field of medical information processing. The method comprises the following steps: obtaining a non-invasive continuous arterial blood pressure waveform and individual information of a target object; preprocessing the non-invasive continuous arterial blood pressure waveform to construct a standardized single cardiac cycle blood pressure waveform; inputting the standardized single cardiac cycle blood pressure waveform and the individual information into a pre-trained hemodynamic estimation model to obtain an estimation result comprising at least cardiac output and stroke volume; wherein the hemodynamic estimation model comprises a deep neural network module, and the hemodynamic estimation model is trained by constraining the output result predicted by the deep neural network module in a physiological relationship described by a three-element Windkessel model comprising arterial compliance, peripheral resistance and characteristic impedance.

The invention relates to the technical field of blood pressure monitoring, and discloses a continuous blood pressure monitoring method and system based on an elastic cavity model and a pulse wave velocity equation, a terminal and a storage medium, and the method comprises the following steps: reflecting a dynamic process among cardiac ejection, artery compliance and peripheral resistance from a system level by using a two-element elastic cavity model; a time domain coupling relationship between blood pressure and blood flow is established, and a pulse wave velocity equation is introduced to calculate artery compliance C parameters of different objects so as to calibrate model compliance C parameters, so that a targeted blood pressure monitoring result is obtained. Individualized physiological information is introduced, and the accuracy and interpretability of blood pressure prediction on different objects are improved.

The application relates to the technical field of blood pressure monitoring, and discloses a continuous blood pressure monitoring method and system based on an elastic cavity model and a pulse wave velocity equation, a terminal and a storage medium, the method comprising the following steps: utilizing a two-element elastic cavity model to reflect the dynamic process among cardiac ejection, arterial compliance and peripheral resistance from a system level, establishing a time-domain coupling relationship between blood pressure and blood flow, and introducing a pulse wave velocity equation to calculate the arterial compliance C parameter of different objects, calibrate the model compliance C parameter, and obtain targeted blood pressure monitoring results. The application introduces individual physiological information, and improves the accuracy and interpretability of blood pressure prediction for different objects.

An apparatus for estimating blood pressure may include a sensor configured to measure a bio-signal from an object; and a processor configured to: obtain a cardiac output (CO) feature based on the bio-signal; obtain a total peripheral resistance (TPR) feature by combining an amplitude of a propagation wave component and amplitudes of at least two reflection wave components of the bio-signal, in response to a variation of the CO feature at a blood pressure measurement time relative to a calibration time, being within a predetermined range; obtain the TPR feature by combining the amplitude of the propagation wave component and an amplitude of one reflection wave component of the at least two reflection wave components, in response to the variation of the CO feature not being within the predetermined range; and estimate blood pressure based on the CO feature and the TPR feature.

The invention belongs to the technical field of ultrasonic monitoring, and discloses a Doppler ultrasonic monitoring method and device for intracranial pressure, and the method comprises the steps: employing an ultrahigh frequency Doppler ultrasonic probe to measure the pulse wave of a neck artery; by analyzing the pulse wave map, pulse wave peripheral resistance parameters closely related to intracranial pressure are extracted; the quantitative relation between the pulse wave parameters and the intracranial pressure is obtained through comparison with the peripheral resistance parameters under the real intracranial pressure condition; 24-hour intracranial pressure monitoring of a patient is realized by continuously acquiring the pulse wave parameters of the neck artery. The technology provided by the invention is used for monitoring the intracranial pressure and also can give an alarm to the occurrence of cerebral apoplexy. The device designed by the invention is small in size, light in weight and convenient to wear, does not influence the living of a patient, and can really realize 24-hour noninvasive monitoring of the intracranial pressure.

The utility model discloses a hemodynamics testing device of a heart and kidney auxiliary blood pump. The hemodynamics testing device comprises a circulation loop formed by sequentially connecting a ventricle simulator, an aorta model, an after-load simulator, an ultraviolet sterilization device and a liquid storage cavity. The switching tool is connected with the aorta model, and a blood pump to be tested penetrates through the switching tool and is arranged near a renal artery branch of the aorta model; each branch of the aorta model converges to the post-load simulator through an auxiliary pipeline, the post-load simulator is connected with the ultraviolet sterilization device, the ultraviolet sterilization device is connected with the liquid storage cavity, the liquid storage cavity is connected with the ventricular simulator, and the ventricular simulator is connected with the aorta model to form a complete circulation loop; wherein the post-load simulator may simultaneously adjust compliance and peripheral resistance in the circulation loop. Based on the real aorta structure of the human body, the working performance of the blood pump in the body of a patient can be evaluated, and the hemodynamic characteristics of the blood pump in the human body environment can be mastered more effectively and more accurately.

A system and a method for applying a gradient of external compressive forces on the body of a person, in a manner analogous to how water exerts hydrostatic forces on the body of person immersed in water. The system may be a chair or a suit, comprising at least one of the following: one compression unit holding fluid around the person to exert a gradient of hydrostatic forces, at least one rigid or semi-rigid frame or a shell supporting the body and the compression units to support the pressure and off-loaded weight of the person and transfer the weight to an external support such as floor. Additionally, the system may contain additional means to reduce the frictional forces on the body surface and between various moving parts, and a means to modify pressure on the body of the person. The system and method is applicable for effecting physiological changes in the body such as increased diuresis and / or amniotic fluid levels, treat preeclampsia in pregnant women, reduce hypertension, shift fluids from interstitial space into intravascular compartment, increase venous return from lower extremities, reduce sympathetic tone and total peripheral resistance, reduce work load on the heart, reduce motion sickness and the like.