19 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.

The tourniquet comprises a chest adjusting band, an armpit adjusting band and a pressurizing air bag, fixing pads are symmetrically connected between the chest adjusting band and the armpit adjusting band, shoulder adjusting bands are arranged on the upper portions of the fixing pads, and the fixing pads and the adjusting bands can be matched for tightness adjustment; a bottom plate is fixedly arranged on the bottom face of the pressurizing air bag and attached to the inner side of the fixing pad, and at least two pressurizing heads are fixedly arranged on a protruding top circular truncated cone of the pressurizing air bag. The pressurizing heads are semicircular cylinders, the cylindrical circumferential surfaces of the pressurizing heads face outwards, and the pressurizing heads are close to each other, so that the pressurizing heads form a double-contact design. According to the tourniquet, the tightness of the multiple adjusting bands is adjusted, so that the tourniquet is more fit with the shape of the human body, precise compression hemostasis can be conducted on important blood vessels such as subclavian arteries and axillary arteries of the upper limbs of the human body, and compared with existing tourniquets which are mostly subjected to planar range compression hemostasis, the tourniquet has the advantage that the hemostasis pain of the wounded can be reduced.

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 invention provides a cun-guan-chi pulse condition and extended pulse condition qi and blood circulation regulating system which comprises a cun-guan-chi pulse condition sensing module, an extended pulse condition recognition module, a qi and blood circulation regulating execution module and a pulse condition feedback module. Through cooperative work of the cun-guan-chi pulse condition sensing module and the extension pulse condition recognition module, overall recognition and communication from local pulse conditions to whole-body pulse conditions are achieved, local limitation of traditional pulse diagnosis is broken through, multiple physiological structures such as internal organs, blood vessels, muscles and bones, fascia, meridians, nerves, muscles, skin and acupuncture points can be fully covered, and the pulse diagnosis effect is improved. And various pathological changes such as thrombus, cyst, nodule, calculus, myoma, tumor, vessel blockage or calcification and the like can be effectively treated. A debonding unit, a pulse pushing unit and a pulse digging unit in the qi and blood circulation regulating execution module can perform accurate operation in a specific area according to pulse condition information, for example, the problems of qi and blood blockage, sclerosis or hydrops and the like can be regulated in a targeted mode at the roots of palmaris, the middle lung lobe, the lower lung lobe and the like.

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.

A device (15, 50, 55, 60, 100, 200) for altering blood flow characteristics in a vessel (20), the device (15, 50, 55, 60, 100, 200) comprising: a cuff (10) configured to be surgically positioned around a portion of the vessel (20); a first pad (40) located on an internal wall of the cuff (10), wherein the pad (40): locally reduces a cross-sectional area of a passageway (25) extending through the cuff (10) and / or defines a passageway (25) within the cuff (10) which is non-linear.

Described here are devices, systems, and methods for improving blood flow in a vessel. Generally, the method may comprise advancing a catheter into a first vessel proximal to an occlusion in the first vessel and forming a fistula between the first vessel and a second vessel. This may deliver blood flow around an occlusion to ischemic tissues located in the peripheral vasculature.

The invention discloses a blood circulation simulation device for a vascular intervention operation, and the device comprises a vein simulation pipeline which is provided with a vena cava, a pulmonary vein, and a vein capillary; the artery simulation pipeline is provided with an aorta, a pulmonary artery and an arterial capillary; the heart simulation pump is provided with a left atrium, a left ventricle, a right atrium and a right ventricle; the vena cava is communicated with the right atrium, the pulmonary vein is communicated with the left atrium, the aorta is communicated with the left ventricle, and the pulmonary artery is communicated with the right ventricle. Real blood vessels are simulated by arranging the vein simulation pipeline and the artery simulation pipeline, the left atrium, the left ventricle, the right atrium and the right ventricle of a real heart are simulated by arranging the heart simulation pump, the left atrium, the right atrium, the left ventricle and the right ventricle are alternately contracted in an air pressure control mode, and the contraction state of the heart is truly simulated; a real blood flow state is simulated in the vein simulation pipeline and the artery simulation pipeline, and a real interventional operation environment is provided for training and learning.

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 invention provides an intracranial vein stent and a delivery system thereof.The intracranial vein stent comprises an inner-layer tube, the inner-layer tube is of a four-cavity structure, namely a first cavity, a second cavity, a third cavity and a fourth cavity, the first cavity is hollow, and the second cavity, the third cavity and the fourth cavity are full; the outer layer pipe is arranged on the inner layer pipe in a sleeving manner; and the woven stent is arranged between the inner-layer tube and the outer-layer tube. The four-cavity structure of the inner-layer tube is arranged, the hollow first cavity can contain a guide wire or a medicine delivery channel, the rigidity of the whole structure is reduced, the filled second cavity, the filled third cavity and the filled fourth cavity achieve staged or local pressure control through independent cavity design, and concentrated stress on the vein wall when the woven stent is unfolded is reduced. The outer-layer tube is sleeved on the inner-layer tube to form a sandwich structure, the braided stent is protected and the preset form of the braided stent is maintained in the conveying process, and meanwhile, the trafficability of the system in tortuous blood vessels is improved through sliding fit between the inner layer and the outer layer. The woven stent is arranged between the inner-layer tube and the outer-layer tube, the non-unfolded state of the woven stent is restrained through interlayer space, controllable release is achieved in combination with the self-expansion characteristic, and mechanical damage of a traditional rigid woven stent to the thin-wall vein is avoided.

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 utility model discloses a portal vein suspension belt which comprises a suspension piece and suspension ropes fixedly arranged on the two sides of the suspension piece, the suspension piece can be bent and can wrap a portal vein blood vessel, the distance of the long edge of the suspension piece is 5-50 mm, the distance of the wide edge of the suspension piece is 3-30 mm, the thickness of the suspension piece is 0.5-3 mm, and by increasing the contact area between the suspension piece and the portal vein blood vessel, the portal vein blood vessel can be fixed to the suspension piece. Deformation of portal vein blood vessels is reduced, smooth blood flow during suspension is maintained, and conditions of portal vein thrombosis, intestinal blood stasis and the like are reduced; the stability of the suspended portal vein is improved, and fine operation in an operation is facilitated. The suspension rope is located in the middle of the wide edge of the suspension piece, the length of the suspension rope ranges from 10 mm to 200 mm, the extension direction of the suspension rope is consistent with the extension direction of the long edge of the suspension piece, the center lines of the two suspension ropes coincide with each other, and the suspension piece and the suspension rope are made of the same material and are both made of silica gel or rubber, so that portal vein blood vessels are protected, and the success rate of an operation is increased.

The utility model relates to an absorbable vein anastomosis auxiliary device which comprises an inner sleeve and two semi-circle segments, the inner wall of the inner sleeve is smooth, the outer wall of the inner sleeve is rough, and the inner sleeve is used for butt joint of the ends of two sections of vein blood vessels to be anastomosed; the inner wall and the outer wall of each half-cycle segment are rough, and the two half-cycle segments are used for clamping and fixing the overlapped and butted parts of two sections of vein blood vessels from the outside; wherein the inner sleeve and the semi-circle pipe piece are both made of degradable absorbing materials. By means of a mechanical anastomosis mode, anastomosis time can be greatly shortened, meanwhile, due to uniform operation, the occurrence rate of vascular related complications can be reduced, the learning curve of surgeons is shortened, operation time is greatly shortened, the operation effect is improved, and operation risks are reduced.

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.

The invention provides a lower limb blood vessel artery calcification evaluation system and method. The method comprises the steps that dual-energy-spectrum signals under high-kilovolt and low-kilovolt X-ray irradiation are acquired through an intelligent energy spectrum sensor; analyzing the dual-energy-spectrum signal to obtain a density distribution diagram of the calcium-based substance; setting a calcification interpretation threshold value of the lower limb vascular artery, performing three-dimensional voxel judgment on the density distribution diagram according to the calcification interpretation threshold value, and further generating a calcification region mask in the lower limb vascular artery; based on the density distribution diagram of the calcium-based substance and the space volume of all voxels in the calcification area mask, carrying out space mass accumulation to obtain the total calcification mass in the lower limb blood vessel artery of the patient; and generating a three-dimensional calcification quantitative report of the blood vessel artery of the lower limb of the patient according to the total calcification mass in combination with the calcification area mask. By adopting the scheme of the invention, the attenuation signals of the calcified plaque and the residual contrast agent can be effectively distinguished when the calcified area is identified.