9 results about "Three vessels" patented technology

The invention discloses a method for measuring the pressure in the heart cavity of a mouse, and relates to the technical field of experimental animal medical detection, and the method comprises the following steps: cutting an incision of about 1cm in the neck of the mouse; placing two sutures below the common carotid artery, and ligating the common carotid artery by using the suture at the distal end; the other section of suture line is placed in the middle of the right common carotid artery, the carotid artery is lifted up, the blood filling condition is observed, an opening is formed in the blood vessel, a pressure volume catheter is inserted, and meanwhile the suture line at the telecentric end is slightly pulled backwards to prevent bleeding; the pressure volume catheter is inserted into the left ventricle through the right common carotid artery, and the left ventricle pressure maximum rising rate and the left ventricle pressure maximum falling rate are collected. By means of the carotid artery approach, serious trauma caused by thoracotomy can be prevented, and the cardiac physiology can be possibly affected by the operation. Therefore, the carotid artery approach is more suitable for a long-time pressure collection experiment.

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.

In a method of non-invasively obtaining information on intracranial pressure of a patient, during a first time period, a plurality of facial veins of the patient are occluded by applying external pressure to each of the plurality of facial veins, which emanate from the periorbital region. During the first time period, external pressure is applied to a designated vein (17) connected to an intracranial vessel at a location within the region, upstream of the occlusion of the plurality of facial veins. Changes in the geometry of the designated vein (17) caused by the external pressure are observed to obtain at least one first value related to venous pressure in the designated vein (17). The at least one first value is processed to obtain information on intracranial pressure. The method enables measuring pressure values that are closely related to intracranial pressure without the need for measurements within the intracranial space. Instead, an occlusion establishes a direct pressure communication between the intracranial vessel and the designated vein, which can be easily examined outside the head.

The present disclosure is directed a method of facilitating treatment via a vascular wall defining a vascular lumen containing an occlusion therein. The method may include providing a first intravascular device having a distal portion and at least one aperture and positioning the distal portion of the first intravascular device in the vascular wall. The method may further include providing a reentry device having a body and a distal tip, the distal tip having a natural state and a compressed state and inserting the distal tip, in the compressed state, in the distal portion of the first intravascular device. The method may further include advancing the distal tip, in the natural state, through the at least one aperture of the first intravascular device.

The utility model discloses a cannula for supporting arteriovenous fistula blood vessels and a supporting device, the cannula is used for sleeving a vein anastomosis connection section, and the cannula is provided with a first end close to an artery anastomosis connection section and a second end far away from the artery anastomosis connection section; in the extending direction from the first end to the second end, the sleeve is bent towards one side, and the length of the sleeve is 10-15 mm. According to the cannula for supporting the arteriovenous fistula blood vessel, by designing the bending form of the cannula, the space angle of the vein anastomosis connecting section is optimized, so that the space angle of the vein anastomosis connecting section is limited within the range of 10-20 degrees; therefore, oscillation shear stress of blood on arteriovenous fistula blood vessels can be well reduced, negative effects of artery blood flow are avoided, and then the problem that the arteriovenous fistula blood vessels are narrow or blocked due to the fact that oscillation shear stress concentration areas exist in the arteriovenous fistula blood vessels is reliably solved.

The invention discloses an on-site installation type full endoluminal repair system for treating Stanford A-type dissection. The on-site installation type full endoluminal repair system comprises an ascending aorta stent-type blood vessel (ascending main assembly), a coronary artery branch covered stent-type blood vessel (coronary artery assembly) and a self-expanding aorta interventional valve (valve assembly) capable of being installed on site according to needs. The lifting main assembly is divided into a lifting main section and a sinus tube section, the lifting main section is a covered stent, the head end is anchored to an ascending aorta, the tail end is transited to be a concave sinus tube section, embedded branches are arranged at the two ends in a cavity of the covered stent in front of the concave part, openings are formed in the sinus tube section, and a metal bare stent is arranged outside the sinus tube section. The coronary artery branch covered stent is a conical small-caliber covered stent, the near end of the coronary artery branch covered stent is connected with an embedded branch of the lifting main assembly, and the caliber of the far end varies due to left and right coronary arteries. The graft may engage the aortic valve component as desired. The invention is specially used for treating the Stanford A-type dissection lesion of the aorta root, can repair the aortic lesion, reconstruct the bilateral coronary artery and connect the aortic valve as required, and can be produced in batches for emergency operations.

The application provides a portal hypertension noninvasive detection system and method based on fractal theory, and belongs to the noninvasive detection field.The system comprises a division module, which is used for dividing a portal vein blood flow process into a pipe flow section and a fractal flow section according to the blood vessel diameter distribution characteristics from a liver blood sinusoid to a portal vein section, and determining the geometric parameters of the pipe flow section and the fractal flow section according to the obtained CT image and angiographic image; an establishment module, which is used for establishing a blood flow model of blood from the liver blood sinusoid to the portal vein according to the determined geometric parameters, combining the fractal theory and the flow law, and obtaining a pressure-flow relationship of the portal vein; a statistical module, which is used for statistically processing Doppler ultrasound images of a user to obtain an average flow value of the portal vein; and a determination module, which is used for obtaining a portal vein pressure value of the user based on the obtained pressure-flow relationship and average flow value of the portal vein. By using the application, the portal vein pressure value can be accurately and quickly predicted.

The invention relates to the technical field of pulmonary nodule puncture, in particular to a multi-angle puncture guider for pulmonary nodule positioning, which comprises a base plate and a chest fixing band arranged on the base plate, and further comprises an angle adjusting frame rotationally arranged on the base plate, and a puncture guide mechanism is vertically arranged in the angle adjusting frame; and the magnetic field eddy current heating mechanism is arranged at the upper end part of the puncture guide tube in the puncture guide mechanism, is used for heating the puncture needle, and is connected with an energy storage mechanism positioned at the side part of the upper end of the puncture guide tube. In the puncture process, the body of a patient may move or shake to cause deviation of puncture and difficulty in meeting the puncture precision, and meanwhile, in the puncture process, a puncture needle easily causes damage to blood capillaries and small veins and does not have a wound pressing function to cause wound bleeding in the puncture process, so that the safety is relatively low. And the puncture effect is also easily influenced.

This invention relates to the field of medical device technology, specifically an ECMO arterial catheter capable of altering the direction of perfusion blood flow. The catheter comprises a tube body with openings at both ends. The right end of the tube body is a pre-flush section, the middle end is a buffer section, and the left end is a perfusion section. The perfusion section includes a central lumen and three side lumens. The central lumen is located in the middle of the inner part of the tube body, and three equally divided septa are located on the outer periphery of the central lumen, dividing the tube body into three side lumens. The inner wall of the left end of each side lumen is a blood flow redirection surface. This invention, by designing the arterial catheter lumen as a central lumen with forward blood flow and three side lumens with redirected blood flow, maximizes the alignment of the blood flow direction in the ECMO arterial catheter with the physiological direction, reduces the adverse effects of ECMO on left ventricular output and damage to the vascular endothelium, and improves hemodynamic stability and safety during VA-ECMO implementation.