5 results about "Vessel diameter" patented technology

This disclosure provides a measurement system and method for the pathological features of hypertensive retinopathy. The measurement system includes: an acquisition module that acquires fundus images; a partitioning module that receives the fundus images and identifies and partitions the optic disc region; a segmentation module that uses an arteriovenous segmentation model to segment the fundus images into arteries and veins to obtain a three-valued image of the segmentation results. The arteriovenous vessel marking results include arterial and venous marking results formed by marking the boundaries of vessels with diameters larger than a preset vessel diameter in the training fundus images, and small vessel marking results formed by marking the course of vessels with diameters not larger than the preset vessel diameter. The measurement module measures the pathological features of hypertensive retinopathy in the fundus images based on the vessels larger than the preset vessel diameter in the partitioning and segmentation results. This disclosure enables efficient and objective measurement of the characteristics of hypertensive retinopathy.

This paper proposes a method for analyzing coronary artery stenosis using DSA (digital subtraction angiography) based on matching measurement. This method combines image preprocessing, catheter calibration, vessel segmentation, and centerline extraction on DSA images with an improved MoM (Measure of Match) model to accurately measure vessel diameter based on matching and calculate the stenosis rate of the stenotic area. This method also features an automatic correction function, enabling automated correction of the stenotic area based on the reference diameter of a normal vessel after stenosis detection, thereby improving detection accuracy and stability. This method is suitable for rapid and accurate analysis of coronary artery stenosis, effectively reducing manual operation errors and demonstrating a high degree of automation.

The invention provides a controllable cerebral blood flow adjusting device for cerebral blood flow reconstruction surgery, and relates to the technical field of medical instruments, the controllable cerebral blood flow adjusting device comprises a connecting elastic piece, and the two ends of the connecting elastic piece are connected with clamping pieces; the clamping piece is of an arc-shaped plate structure, and a traction piece is mounted at the bottom of the clamping piece; the connecting elastic piece, the clamping piece and the traction piece are made of polylactic acid-glycolic acid copolymer. When the device is used, under the assistance of ultrasonic waves, a traction sheet is used on a blood vessel to set proper clamping force so as to artificially cause blood vessel constriction, the inner-layer clamping sheet with different polylactic acid-glycolic acid copolymer proportions is used, the degradation speed of the whole device can be controlled and adjusted, then along with ordered degradation of the device, the clamping force on the blood vessel is gradually reduced, and the blood vessel constriction effect is improved. The constriction degree of the blood vessel is gradually reduced, and the blood vessel is finally recovered to a normal blood vessel diameter, so that the problems of headache, dizziness and other discomfort of a patient caused by intracranial blood flow over-perfusion are solved.

This invention relates to a method for calculating retinal vessel diameters in fundus images based on region segmentation. The method includes: acquiring a fundus image to be processed; locating the center point of the fundus image to obtain a fundus image with a center point marker; performing region segmentation on the marked fundus image based on an automatic segmentation model to obtain segmented vessel regions; extracting the initial centerline of each vessel region to obtain a fundus image with vessel centerlines; performing secondary segmentation on the fundus image with vessel centerlines to obtain a fundus image with a tree structure and single-branch vessels; and then performing interpolation and smoothing operations pixel by pixel to obtain the average, maximum, and minimum vessel diameters of each vessel region. This invention aims to divide the vessels into different regions based on an automatic segmentation model and simultaneously calculate various vessel parameters within each region, exploring its segmentation capabilities and potential application value.

A growth stent and valve and methods for making and using the same. The growth stent and valve may be delivered to treat early stage congenital lesions, while expanding to adult vessel diameters. In selected embodiments, the growth stent and valve can comprise a frame and may have a covering on some portion to prevent blood flow through a wall of the frame. The growth stent and valve advantageously can maintain radial strength across an entire range of diameters necessary to treat a narrowed lesion from birth and childhood through adulthood as the vessels grow over the lifetime of a patient.