273 results about "Arterial blood" patented technology

The invention comprises a method and apparatus for processing signals reflecting a physiological characteristic by performing an error minimizing mathematical combination between signals from at least two independent sensors. For example, the intensity of light is detected following tissue absorption at two wavelengths and the signals are corrected. Preferably, corrected intensity signals are derived by orthogonal regression. In one embodiment, the method and apparatus are used to determine arterial oxygen saturation.

Disclosed herein are exemplary embodiments of an impulse therapy garment for use in pump therapy for enhancing venous and arterial blood flow. The garment may be advantageously fitted to a human foot, and may include a rotationally positionable heel-strap, an air inlet connector, separate dorsum straps, or other features. For example, other garments may include a washer having a center hole locatable around the stem and configured to be forcibly retained against the outer surface of the fabric by snap-fit using annular stem protrusions extending from an external surface of the stem. In further embodiments, a garment may include a bladder retention fastener configured to retain an end of the bladder to the fabric to allow substantially differential movement between the fabric and non-retained portions of the bladder during inflation and deflation of the bladder.

An adaptive tourniquet cuff system comprises: a tourniquet cuff having a physical characteristic and including an inflatable bladder of a length greater than the circumference of a limb at a selected location; a cuff connector carried on the cuff and communicating pneumatically with the bladder for releasably connecting to a tourniquet instrument to establish a gas-tight passageway between the bladder and the tourniquet instrument; and an identifying collar including identification means indicative of the physical characteristic and detectable by the tourniquet instrument upon establishment of the gas-tight passageway. The tourniquet instrument may supply gas to the bladder through the gas-tight passageway at a pressure sufficient to stop arterial blood flow into the limb distal to the cuff at the selected location, and may adapt its operation in response to the detected physical characteristic of the cuff.

The invention discloses a non-invasive central aortic blood pressure measuring method and device. The non-invasive central aortic blood pressure measuring method includes, according to a human artery network model based on viscous fluid mechanics, a method of calculating artery network model personalized parameters of a measured person through measured radial artery and brachial artery pulse wave signals and arm blood pressure values, a method of calculating an ascending aorta-radial artery transfer function and a method of calculating central arterial pressure waveforms through measured central arterial pressures. The non-invasive central aortic blood pressure continuous measuring device comprises a pulse wave signal processing and analysis unit and a radial artery and brachial artery pulse wave signal acquisition unit worn on a wrist. The method is different from an existing general transfer function method, the artery network model parameters of each person to be measured are measured and calculated and the artery network model parameters are numerical characteristics of the cardiovascular system states of the person to be measured with the calculated central arterial pressure waveforms, and the method and device has important meanings in prevention, curing and control of cardiovascular diseases, especially high-risk diseases, such as hypertensions and coronary heart diseases.

A micro-volume blood transfer device to facilitate the collection of small volumes of clean arterial blood from patients who may be volume restricted for blood loss such as low-birth weight infants.

A peripheral arterial flow obstruction detection system for providing a predictive diagnosis correlating to the diagnosis peripheral arterial disease. The system includes a host computer and a sensor used to detect and measure a physiological signal from a subject's finger or toe, such as the measurement of a signal using photoplethysmography using a PPG sensor. Sensor data is processed and filtered before being used to calculate a number of time-domain and frequency-domain calculations corresponding to the signal waveform. The calculations are used in a predictive model using a multi-faceted algorithm to provide a predictive diagnosis that is displayed on an indicator such as a monitor.

The invention provides a simple and convenient method and a simple and convenient system for evaluating hemodynamic indexes and characteristic parameters of a blood signal of a carotid arterial system through non-invasive detection on blood pressure of brachial arteries and an axial blood velocity signal of a common carotid artery. The method comprises the following steps: detecting the waveform and a numerical value of an axial blood velocity of the common carotid artery by using a continuous Doppler blood velocity waveform detecting module, detecting diastolic pressure and systolic pressure of a human body by using an arm-type electronic blood pressure detecting module, and then calculating hemodynamic parameters of the carotid arterial system by a simplified method; and selecting Morlet mother wavelet for wavelet analysis on the waveform of the blood velocity of the common carotid artery, and calculating the characteristic parameters of the blood signal. The method is an analysis method which combines the hemodynamic principle and wavelet transformation; compared with the method adopted by the conventional cerebral hemodynamic analysis device, the signal acquisition and analysis method is simpler; and to a great extent, the defects that the conventional analysis device is complicated in structure, huge in volume, complex in operation, high in price and the like are overcome.

The invention relates to the technical field of pelvis and pelvis artery blood vessel tree segmentation, in particular to a deep learning-based pelvis and pelvis artery blood vessel multi-level segmentation method, which is used for solving the problem that an abdomen pelvis and a pelvis artery blood vessel tree cannot be automatically, efficiently and accurately segmented in a multi-resolution CTimage in the prior art. The method comprises the following steps: step 1, preparing and labeling data; 2, preprocessing the data; 3, constructing a first-level segmentation model of the 3D convolutional neural network based on multi-level segmentation; 4, constructing a second-stage segmentation model; 5, training a first-stage segmentation model and a second-stage segmentation model by using thecalibrated data and the synthesized loss function; and 6, performing abdomen information segmentation on the input three-dimensional CT image by using the first-stage segmentation model and the second-stage segmentation model trained in the step 5. According to the method, the abdominal pelvis and the pelvis vascular tree can be automatically, efficiently and accurately segmented in the multi-resolution CT image.

The invention discloses a vascular tissue engineering reactor with rotation function. The reactor overcomes the disadvantages that the common arterial tissue engineering reactors can not simultaneously supply the vascular tissue with the culture conditions of intravascular perfusion and vascular rotation, and the mass transfer performance is poor. The vascular tissue engineering reactor comprises a liquid storage bottle, a liquid driving device, a vascular tissue culture cavity, a linear motor, a step motor, a vascular tissue transmission device, and the like, realizes the vascular tissue rotation in the course of intravascular perfusion culture, and has good mass transfer performance.

The disclosure relates to an apparatus for segregating particles on the basis of their ability to flow through a stepped passageway. At least some of the particles are accommodated in a passage bounded by a first step, but at least some of the particles are unable to pass through a narrower passage bounded by a second step, resulting in segregation of the particles. The apparatus and methods described herein can be used to segregate particles of a wide variety of types. By way of example, they can be used to segregate fetal-like cells from a maternal blood sample such as maternal arterial blood.

The invention relates to a stent model matching method and device for intracranial aneurysm and a stent simulation display method. The stent model matching method comprises the following steps of: acquiring image data related to intracranial artery blood vessels, and constructing a three-dimensional blood vessel model by processing the image data; obtaining a target area in the three-dimensional blood vessel model, and extracting a blood vessel center line in the target area and a plurality of pieces of center line data of points on the blood vessel center line; carrying out processing according to the blood vessel center line and the center line data to obtain a nominal diameter and a nominal length of the stent; and according to the nominal diameter and the nominal length of the stent, obtaining a matched stent model in a preset stent database. By adopting the method, the stent model matching efficiency and the blood vessel suitability can be improved.

An application of tanshinone 11A to preparing the medicines for preventing and treating atherosclerosis and its related diseases is disclosed. The tanshinone 11A can reduce the deposit of cholesterol on the inner surface of artery.

A method for calibrating a pulse oximeter device and an apparatus incorporating the method and a system for utilizing the method. The method is based on modeling light propagation in tissue at two wavelengths, typically, one in the red and one in the infrared range of the spectrum. A formula is derived relating the arterial oxygen saturation to a ratio R commonly measured by standard pulse oximeters. A specific parameter is identified and utilized in the calibration of the oximeter. This parameter is formulated in terms of the DC signals measured by the pulse oximeter at the two wavelengths. An empirical method for estimating this parameter based on experimental data is also described.

The invention relates to a blood pressure measurement apparatus. The blood pressure measurement apparatus comprises a sleeve and a host connected with the sleeve. An upstream balloon and a downstream balloon are located on the flowing upstream and the flowing downstream of artery blood of the detected body, the downstream balloon is used for detecting change information of pulse signals, blood flow pulse changes caused by pressure changes of the upstream balloon are sensed in real time, and a microprocessor controls an air pump and an air release valve and processes pressure values, pulse signals or pressure values and pulse signals of one or two of the upstream balloon and the downstream balloon, wherein the pressure values, the pulse signals or the pressure values and pulse signals of one or two of the upstream balloon and the downstream balloon are detected by one or two of a first pressure sensor and a second pressure sensor respectively or simultaneously. According to the blood pressure measurement apparatus, the two inflating balloons are bonded to the limbs to perform pressurizing, pressure and pulse signals in the blood pressure measurement apparatus can be effectively detected, and thus blood pressure can be measured accurately and reliably, and measurement results are stable.

The embodiment of the invention discloses an artery and vein determination method and device, equipment and a storage medium. The artery and vein determination method comprises the steps that initialmedical image data containing a target blood vessel is obtained; based on a pre-trained trunk extraction neural network model, artery trunk information and vein trunk information in the initial medical image data are determined, wherein the artery trunk and the vein trunk are the artery blood vessel and the vein blood vessel of a preset branch in the target blood vessel respectively; artery fine branch information and vein fine branch information in the initial medical image data are determined based on preset constraint conditions; and artery blood vessel information and vein blood vessel information of the target blood vessel are obtained according to the artery trunk information and the vein trunk information. According to the technical scheme of the embodiment of the invention, the artery blood vessel and the vein blood vessel can be quickly, accurately and completely separated.

The invention provides a fundus image retina arteriosclerosis detection method based on an improved encoding and decoding network, and the method comprises the steps: 1) collecting a fundus image, diagnosed as retina arteriosclerosis, of an ophthalmologist, fitting diseased blood vessels in the fundus image, and calculating and counting reflection parameters, so as to determine a retina arteriosclerosis detection threshold value; 2) improving a coding and decoding network by utilizing an Inception ResnetV2 module and a residual attention mechanism module, and applying the coding and decoding network to segmentation of artery blood vessels and artery reflective tapes; and 3) screening an effective area, sampling the effective area, fitting by utilizing a four-section Gaussian model to obtain a blood vessel gray scale distribution curve, calculating a reflection parameter according to a fitting result, comparing the reflection parameter with a threshold value, and judging whether the patient suffers from retinal arteriosclerosis or not. According to the method, the quantitative detection threshold of the retinal arteriosclerosis is determined, the deep learning technology is utilized, the problem that fundus arteriovenous blood vessels and artery reflective tapes cannot be accurately segmented through a traditional method is solved, and detection of the retinal arteriosclerosis is completed.

The invention discloses a traditional Chinese medicine composition for treating decrease of ovarian reserve functions. The traditional Chinese medicine composition is prepared from effective components and medicine excipients. The effective components comprise, by weight, 5-30 parts of radix rehmanniae preparata, 6-30 parts of fructus lycii, 9-30 parts of caulis spatholobi, 9-35 parts of herba epimedii, 5-30 parts of semen cuscutae, 5-30 parts of herba cistanches, 3-30 parts of rhizoma cyperi and 3-15 parts of fructus crataegi. The traditional Chinese medicine composition has the advantages that menstrual amount decrease symptoms related to the decrease of the ovarian reserve functions can be obviously relieved by the traditional Chinese medicine composition, and effective up-regulation effects can be realized for related hormone AMH (anti-mullerian hormone) which can reflect the decrease of the ovarian reserve functions; MRS scores and traditional Chinese medicine symptom scores which can reflect the life quality of patients can be improved by the traditional Chinese medicine composition; effects of the traditional Chinese medicine composition for improving the decrease of the ovarian reserve functions are possibly relevant to improvement of ovarian blood supply and reduction of artery blood resistance indexes; the traditional Chinese medicine composition is free of obvious side effects when used within short time.

The invention discloses a cyclodextrin functionalized derivative carrier system based on polyamide-amine and its application. The carrier system is made of cyclodextrin functionalized with polyamide-amine. The chemical The structure is as follows: Among them, cyclodextrin is β-cyclodextrin or its derivatives, γ-cyclodextrin or its derivatives, PAMAM is the core of ethylenediamine, and the end is aminated polyamide-amine (G0-G4), m =2-6; the carrier system has the function of simultaneously loading tanshinone IIA drugs, and can jointly load drugs and genes; the carrier system can be applied to in vitro gene cell transfection and treatment of arterial restenosis; the present invention is aimed at According to the characteristics of endothelial injury, a new type of carrier system is proposed, which can simultaneously load tanshinone drugs and genes, which can effectively repair the damaged endothelium, inhibit the proliferation of tissue cells, and achieve the effect of synergistic treatment. It has a good application prospect in prevention and treatment.

The invention discloses an auxiliary diagnosis system and method for a Parkinson's disease based on multimodal transcranial ultrasonography. The system comprises an input module, a feature extractionmodule, a feature selection module and a diagnosis module. The input module passes through the feature extraction module and the feature selection module and then is connected with the diagnosis module; the input module reads an ultrasound image and an ultrasound colorful Doppler image, the feature extraction module extracts image features of a substantia nigra area of the ultrasound image, and division is conducted to obtain an arterial blood flow frequency spectrum curve in the Doppler image; the feature selection module selects features of the ultrasound module; the diagnosis module classifies multimodal features through a multimodal learning algorithm to obtain an auxiliary diagnosis result as an auxiliary reference for doctors to carry out diagnosis.