151 results about "Arterial vessel" patented technology

The invention discloses a method and system for sensing health based on a fingertip wearable spectrum sensor and a computer program product, and the method comprises the steps: controlling a spectrum chip to collect characteristic spectrum data corresponding to an artery blood vessel projection region of a user according to a received index monitoring instruction; the characteristic spectrum data is obtained based on emission and reception of one or more light from ultraviolet light to near-infrared light; receiving the characteristic spectrum data sent by the spectrum chip, and calculating a calibration spectrum value based on the characteristic spectrum data; and the calibration spectrum value is sent to the intelligent terminal, so that the intelligent terminal calculates the physiological health index, analyzes and processes the physiological health index, and pushes a personalized adjustment scheme. The fingertip wearing type spectrum sensing glove is convenient to wear, rich characteristic spectrum data can be collected according to user requirements, the intelligent terminal can quickly and accurately calculate various physiological health indexes, the intelligent terminal is not limited to traditional heart rate and blood oxygen monitoring, and the intelligent terminal can further analyze and process the physiological health indexes.

The invention relates to the technical field of model reconstruction, in particular to a method for reconstructing a coronary artery model based on coronary artery angiography. The method comprises the following steps: acquiring a coronary artery scanning image of a patient; performing three-dimensional coronary artery space structure construction on the coronary artery image of the patient to generate a three-dimensional coronary artery space model; performing blood vessel diameter analysis on the three-dimensional coronary artery space model to generate coronary artery blood vessel diameter data; acquiring an X-ray angiography image of a patient; performing coronary artery vein structure construction on the X-ray angiography image of the patient to generate a three-dimensional coronary artery vein model; and performing blood vessel wall thickness analysis on the three-dimensional coronary artery vein model to generate coronary artery blood vessel wall thickness data. According to the method, multi-modal modeling is carried out by combining the coronary artery scanning image and the X-ray angiography image of the patient, anomaly analysis is carried out on the coronary artery, and the accuracy and reliability of coronary artery model reconstruction are improved.

The invention discloses application of decitabine in preparation of a medicine for resisting vascular calcification, and belongs to the technical field of medical biology. A CKD mouse vascular calcification model is constructed through combination of 5 / 6 nephrectomy and high phosphorus diet (5 / 6NX), and it is observed that the expression level of DNMT3A in model mouse calcified blood vessels is remarkably increased, and the DNA methylation degree is remarkably increased. Based on this, people try to use decitabine to reduce the expression of DNMT, and discover that intraperitoneal injection of decitabine inhibits the expression of DNMT3A in CKD artery blood vessels and osteogenesis-like transdifferentiation of vascular smooth muscle cells, so that CKD-related vascular calcification is effectively relieved.

The invention provides an implantable wireless passive blood pressure monitoring device, which relates to the technical field of blood pressure detection and comprises a blood pressure sensor and an in-vitro reading device, the blood pressure sensor comprises an outer inductance coil and an internal interdigital capacitor; the inductance coil is connected with the interdigital capacitor through a cross-layer line to form a capacitance-inductance LC loop; the inductance coil and the interdigital capacitor are packaged in the soft base material silicon rubber; the blood pressure sensor is used for being attached to the outer wall of an artery blood vessel, and the resonant frequency of the blood pressure sensor can change along with compression tensile deformation of the blood vessel; the in-vitro reading device is used for reading the resonant frequency of the blood pressure sensor; wherein the resonant frequency read by the in-vitro reading device is used for calculating a blood pressure value. The implantable wireless passive blood pressure monitoring device provided by the invention is used for providing a blood pressure monitoring mode with high measurement precision and small trauma so as to improve the accuracy and comfort of blood pressure monitoring.

The invention discloses a traditional Chinese medicine composition with an effect of improving artery blood vessel plaque and a preparation method and application thereof, and belongs to the technical field of traditional Chinese medicine. The technical problem to be solved is to provide a traditional Chinese medicine composition capable of improving vascular plaques such as carotid artery, aortic arch, brachial trunk, subclavian artery and the like aiming at the current situation that adverse reactions exist when statin lipid-lowering drugs and antiplatelet drugs are taken for a long time to treat artery vascular plaques. According to the technical scheme, the traditional Chinese medicine composition with the effect of improving the artery blood vessel plaque is characterized by comprising radix puerariae, red yeast rice, folium cortex eucommiae, hippophae rhamnoides leaves and natto.

Systems and methods are provided for reducing the reliance on operator skill during vascular ultrasound procedures. The placement of an ultrasound probe to assess perfusion associated with a wound may be facilitated by receiving input suitable for identifying an anatomical region associated with the wound and providing an indication of a suitable initial probe position, and optionally, probe orientation, for acoustically interrogating a target arterial vessel known to provide perfusion to the anatomical region associated with the wound. Regions exhibiting arterial flow may be detected as the probe is moved, enabling arterial vessel detection and localization. A subregion within the detected arterial vessel and a beam steering angle may be autonomously determined for spectral Doppler data collection, enabling the measurement of hemodynamic measures associated with the arterial vessel. Example apparatus for securing the probe to the patient and facilitating probe positioning to search for a target vessel are disclosed.

The invention belongs to the technical field of medicines, and discloses an application of a small molecule compound in preparation of a product for preventing and / or treating pulmonary arterial hypertension and complications thereof. The small molecule compound is 8-[[4-(cyclopropanecarbonyl) piperazine-1-yl] methyl]-1, 3-dimethyl-7-(3-methylbutyl) purine-2, 6-diketone, and the structural formula is as shown in a formula (I): # imgabs0. The small molecule compound and pharmaceutically acceptable salts thereof have a remarkable treatment effect on pulmonary arterial hypertension and complications thereof, and can be used for treating pulmonary arterial hypertension and complications thereof. The effects of preventing and / or treating the pulmonary arterial hypertension include the reduction of right heart hypertrophy, the reduction of right ventricular systolic pressure, right heart enlargement, right heart dysfunction, pulmonary vascular remodeling, pulmonary arterial intima thickness, increase of vascular myelization, pulmonary arterial smooth muscle cell proliferation and migration, the reduction of the right ventricular hypertrophy, the reduction of the right ventricular hypertrophy, the reduction of the right ventricular hypertrophy and the reduction of the right ventricular hypertrophy. The pulmonary arterial intima thickness and the vascular myelization level are improved, pulmonary vascular remodeling is reversed, and pulmonary artery smooth muscle cell proliferation and migration are inhibited.

The present invention discloses a nursing pressing hemostasis device: comprising a core pressing mechanism, the core pressing mechanism comprising an upper annular frame; side connecting ears are symmetrically provided on both sides of the upper annular frame; and also comprising an adjustable strap, the two ends of the adjustable strap being fixed on the side connecting ears; precise positioning and pressure application: the ingenious design of the upper annular frame, the sliding track and the core functional shell in the core pressing mechanism ensures that the annular outer elastic pressing pad and the inner elastic pressing pad can be precisely aligned with the patient's arterial blood vessels. The stable sliding of the guide block in the long guide groove not only provides precise guidance for the movement of the core functional shell, but also enables the pressing pad to flexibly adjust its position according to actual needs, thereby ensuring precise pressure on the arterial blood vessels, greatly improving the success rate and effect of hemostasis, and effectively reducing hemostasis failure or delay caused by inaccurate pressing position.

The invention discloses a preparation method of vascular tissue-derived extracellular vesicles, and belongs to the field of cytobiology. According to the preparation method of the extracellular vesicles, the artery blood vessel tissue is directly subjected to enzymolysis through collagenase, the extracellular vesicles are obtained by combining low-speed centrifugation and ultra-speed centrifugation methods and utilizing a differential centrifugation mode, and the technical blank of obtaining the extracellular vesicles from the blood vessel tissue is filled. Experimental results show that the extracellular vesicles can be successfully prepared from collagenase I, collagenase II, collagenase IV, collagenase V or collagenase IV combined with elastin, the prepared extracellular vesicles are different in particle size, form, yield, protein quantity, purity and the like, and the quality of the extracellular vesicles obtained by enzymolysis of collagenase IV combined with elastin is optimal. The extracellular vesicles are extracted from vascular tissues with normal physiological characteristics for the first time, a new source is provided for preparation of the extracellular vesicles, and the extracellular vesicles have great significance in expanding application of the extracellular vesicles.

The invention discloses an extravascular stent, and relates to the technical field of medical instruments. The extravascular stent comprises a first sleeve joint piece, a second sleeve joint piece and a third sleeve joint piece, the first sleeving piece is suitable for being arranged on the periphery of a vein in a sleeving mode, a plurality of deformation grooves are formed in the first sleeving piece, the area between every two adjacent deformation grooves is hollowed out, and the deformation grooves are used for enabling the first sleeving piece to adapt to the diameter change of the vein; the second sleeving piece is connected with one side of the second end of the first sleeving piece, and the second sleeving piece is suitable for being connected to the periphery of the artery blood vessel on the upstream side in a sleeving mode; the third sleeving piece is connected with the other side of the second end of the first sleeving piece, and the third sleeving piece is suitable for being connected to the periphery of the artery blood vessel on the downstream side in a sleeving mode. According to the extravascular stent provided by the invention, the structural design is improved, the mounting convenience of the extravascular stent is improved, the operation time is shortened, the adaptability of the extravascular stent to the diameter change of a vein is improved, the material cost is saved, and the treatment cost is reduced.

The present invention discloses the application of burdock root polysaccharide in the preparation of a medicament for treating pulmonary hypertension, belonging to the field of pharmaceutical technology. The present invention prepares a medicament for treating pulmonary hypertension with burdock root polysaccharide as the sole active ingredient. The medicament comprises an effective amount of burdock root polysaccharide and pharmaceutically acceptable excipients. Experimental results show that burdock root polysaccharide significantly reduces the increase in pulmonary artery pressure induced by monocrotaline in rats, significantly inhibits the increase in right ventricular hypertrophy index, significantly alleviates pulmonary artery endothelial injury, medial thickening, excessive proliferation of medial cells and infiltration of inflammatory cells in rats with pulmonary hypertension, significantly alleviates the degree of pulmonary artery vascular muscleization in rats with pulmonary hypertension, has the effects of reducing pulmonary artery vascular remodeling and lowering pulmonary artery pressure, and has a significant therapeutic effect on pulmonary hypertension and right ventricular hypertrophy in rats, and can be applied to the preparation of a medicament for treating pulmonary hypertension.

The invention belongs to the technical field of medicines, and discloses application of WZ3146 in preparation of products for preventing and / or treating pulmonary arterial hypertension and complications thereof. The WZ3146 and the pharmaceutically acceptable salt thereof have a remarkable treatment effect on pulmonary arterial hypertension and complications thereof, such as mean pulmonary arterial pressure, high right ventricular systolic pressure, right heart enlargement, right heart dysfunction, pulmonary vascular remodeling, pulmonary arterial intima thickness, increase of vascular myelization, pulmonary artery smooth muscle cell proliferation and migration and the like; the effects of preventing and / or treating pulmonary arterial hypertension comprise expanding the right heart, improving the pulmonary arterial intima thickness and the vascular myelization level, reversing pulmonary vascular remodeling and inhibiting pulmonary artery smooth muscle cell proliferation and migration.

A personalized whole-brain small artery angiogenesis method based on multiple constraints, belonging to the field of mathematical modeling algorithm development, includes the following steps: constructing a personalized three-dimensional model based on real head and carotid CTA images to determine the starting position of blood vessel growth; recording the geometric parameters (such as outlet area, outlet blood vessel length, etc.) of each blood vessel model based on the personalized model; using the Brainstorm standard head model three-dimensional point cloud file, uniformly sampling it as the ending position of blood vessel growth; based on multiple constraints, using the simulated annealing algorithm to optimize the geometric parameters of small blood vessels and calculate the spatial positions of bifurcations of blood vessels at all levels after meeting the constraints. The personalized whole-brain small artery angiogenesis real model of the present invention improves the accuracy for numerical simulation and hemodynamic calculation.

The utility model relates to a large area contact type thread type degradable magnesium alloy aortic blood vessel anastomat, including the conical inner ring, conical outer ring and sleeve outer ring that set gradually from inside to outside, be provided with blood vessel clamping space between the conical inner ring and conical outer ring, it is the thread cooperation between conical outer ring and sleeve outer ring, adjust the size of blood vessel clamping space through the rotation sleeve outer ring, sleeve outer ring. The utility model simple structure, reasonable in design, convenient to use, adjust the size of blood vessel clamping space through the rotation conical outer ring and sleeve outer ring to fixed blood vessel, realize blood vessel anastomosis fast, avoid the mode of the traditional everted type through end face combination simultaneously, greatly increase the contact area between blood vessel and prevent the occurrence of blood leakage.

The utility model discloses an instrument for negative pressure extraction and filtration of thrombus of an artery. Comprising a sheathing canal, a blocking balloon, a blood collection bag, a pipeline and a negative pressure providing structure, the blocking balloon is arranged on the outer side of the thrombus treatment sheathing canal, then the blood collection bag is connected to the outer side of the sheathing canal through the pipeline, the sheathing canal is connected with the blood collection bag through the pipeline, and a thrombus filter screen is arranged in the pipeline; a negative pressure providing structure is further arranged, the negative pressure providing structure is a structure with a cavity which is arranged on the outer side of the blood collection bag and used for constructing negative pressure by extracting gas in the blood collection bag, power is provided through the negative pressure to lead blood in the arterial blood vessel out into the blood collection bag, and thrombus is blocked at the position of the filter screen after the blood passes through the thrombus filter screen. The filtered safe blood flows into the blood collecting bag, the blood in the blood collecting bag can be transfused back to the patient again in a transfusing mode, and the blood in the blood collecting bag can also provide a blood source for substances for extracting platelet rich plasma (PRP) therapy.

The application discloses a kind of peripheral blood vessel tension measurement method and device based on ultrasound, it is related to the technical field of hemodynamics monitoring.The application collects the ultrasound image and arterial spectrum data of peripheral artery, obtains the pressure gradient variation characteristic parameter of peripheral artery from the ultrasound image of peripheral artery;According to the arterial spectrum data of continuous multiple heart cycles in the time period set according to peripheral artery, the resistance characteristic parameter of the rise and fall of blood flow velocity and the forward blood flow of peripheral artery are obtained;The pressure gradient variation characteristic parameter, resistance characteristic parameter and forward blood flow are used, which comprehensively reflect the peripheral arterial vessel tension situation.The application can use ultrasound to realize non-invasive, convenient and dynamic real-time reflection of peripheral vessel tension, and the hemodynamic changes can be fed back through the peripheral vessel tension waveform diagram, which is beneficial to early warning and helpful for health management and clinical guidance.

The application discloses an arteriovenous fistula blood vessel lining support and a use method thereof, and the arteriovenous fistula blood vessel lining support has a three-way pipe structure; the axes of two passages in the three-way pipe structure are on a straight line to form a straight pipe, and the axis of the other passage has a variable included angle with the straight line formed by the axes of the first two passages to form a bifurcated pipe; the straight pipe and the bifurcated pipe jointly form a three-way shape of the support with an inner cavity and have optional additional structures near each port; the straight pipe is used for being implanted into an arterial blood vessel; and the bifurcated pipe is used for sleeving a venous blood vessel which needs to be connected. After the arteriovenous fistula blood vessel lining support is embedded, the occurrence of turbulent flow is effectively reduced, blood composition deposition is reduced, the probability of vascular hyperplasia and vascular stenosis is reduced, the arteriovenous fistula maturation time is shortened, and the use time of the fistula is prolonged.

The invention relates to the field of animal models, in particular to a construction method and application of an experimental animal plaque model.The construction method includes the steps that after blood flow is blocked through a balloon method, induction is conducted by directly infiltrating a calcium chloride solution into an endarterium, and finally an artery blood vessel calcified plaque model is formed; therefore, an experimental animal model with high efficiency, repeatability, minimally invasive property and pathological correlation is provided for the research of the artery blood vessel calcified plaque.

This application relates to a method and related apparatus for vascular imaging of an artificial artery and vein arm. The method includes the following steps: acquiring superficial near-infrared images and deep near-infrared images; layering the deep near-infrared images based on the superficial near-infrared images to obtain venous and arterial image information; acquiring pulsed Doppler ultrasound images and obtaining the relative positional relationship between the venous and arterial vessels based on the pulsed Doppler ultrasound images; calculating theoretical arterial image information based on the relative positional relationship from the venous image information; matching the theoretical arterial image and the arterial image, and completing the arterial image based on the matching result. This application has the advantage of improving the imaging effect of vascular imaging instruments.

A method of providing support in an aortic region. The method includes wrapping a landing band around an outside of a portion of an aortic vessel in a vicinity of a sinotubular junction (STJ) to form a wrapped portion of the aortic vessel. The method further includes securing the landing band to form a secured landing band. The method also includes endovascularly delivering a stent graft in a radially constricted configuration into the aortic vessel. The method also includes deploying the stent graft to a radially expanded configuration such that the stent graft contacts the wrapped portion of the aortic vessel. The method also includes connecting the stent graft in the radially expanded configuration to the secured landing band.

The utility model relates to the technical field of practice teaching molds, and discloses a compression hemostasis teaching aid for adolescent emergency training, which is provided with a liquid bag, a simulated artery blood vessel, a simulated vein blood vessel, a simulated capillary and a micro pump, the liquid bag is used for storing simulated blood; the simulated artery blood vessel, the simulated vein blood vessel and the simulated capillary blood vessel are all of transparent structures and are respectively connected with the liquid bag, and the simulated artery blood vessel, the simulated vein blood vessel and the simulated capillary blood vessel are respectively connected with valves for controlling the on / off state of a pipeline; the micro pump is used for outputting pumping pressure to the liquid bag, and the pumping pressure of the micro pump is adjustable corresponding to the set flow velocity of the simulated artery blood vessel, the simulated vein blood vessel and the simulated capillary blood vessel. The first-aid training device can simulate different blood vessels of a human body and press the corresponding blood vessels to force blood flow in the corresponding blood vessels to be stopped, so that teenagers can practice operation in training, and the teaching effect of first-aid training of the teenagers is effectively improved.

The present invention relates to a deep learning-based medical image carotid artery segmentation algorithm and system. The method acquires and preprocesses raw neck medical image data, then inputs it into a pretrained medical image carotid artery detection network for vessel localization, generating a carotid artery localization frame. The portion of the neck medical image corresponding to the localization frame is then input into a pretrained medical image carotid artery segmentation network for vessel segmentation, generating a carotid artery segmentation result. Finally, the carotid artery segmentation result and the raw neck medical image data are visualized. Compared to existing technologies, the present invention offers the advantage of high segmentation accuracy.

The application relates to the technical field of model reconstruction, in particular to a method for reconstructing a coronary artery model based on coronary angiography. The method comprises the following steps: acquiring a coronary artery scanning image of a patient; performing three-dimensional coronary artery spatial structure construction on the coronary artery image of the patient to generate a three-dimensional coronary artery spatial model; performing blood vessel diameter analysis on the three-dimensional coronary artery spatial model to generate coronary artery blood vessel diameter data; acquiring an X-ray angiography image of the patient; performing coronary artery blood vessel network structure construction on the X-ray angiography image of the patient to generate a three-dimensional coronary artery network model; and performing blood vessel wall thickness analysis on the three-dimensional coronary artery network model to generate coronary artery blood vessel wall thickness data. The application combines the coronary artery scanning image and the X-ray angiography image of the patient to perform multi-modal modeling, and performs abnormal analysis on the coronary artery, thereby improving the accuracy and reliability of the coronary artery model reconstruction.

The present invention relates to the technical field of biomedical materials, and particularly to a solid-liquid biphasic embolic agent with a surface cilia structure and a preparation method thereof; it includes a liquid embolic material in the oil phase and Janus cilia microspheres with hydrophilic cilia structures; the Janus cilia microspheres encapsulate the liquid embolic material in the oil phase, and when encapsulating, the hydrophilic cilia structures in the Janus cilia microspheres are exposed outward in the aqueous phase, so that the surface of the solid-liquid biphasic embolic agent has a cilia structure; the cilia structure can improve the interaction force between embolic material particles and between embolic material particles and the blood vessel wall, has excellent viscoelasticity and deformation ability, can reach finer arterial blood vessels, realize efficient embolization of thick and thin arteries, and improve the efficiency of tumor embolization chemotherapy; and the cilia structure is combined with the solid-liquid biphasic system, which not only improves the embolization effect, but also enhances the stability of the embolic agent, prolongs the action time, and optimizes the biocompatibility, and will have broad application prospects.

The invention discloses a blood vessel end side anastomat based on a lining. A containing cavity is reserved between an inner cylinder and an outer cylinder; the outer wall of the end of the outer barrel is fixedly connected with the nail pushing device, the inner wall of the end of the inner barrel is fixedly connected with a limiting disc, the outer wall of the limiting disc extends out of a limiting rod to be in limiting connection with the nail pushing device, and the end of the inner barrel is adjustably connected with the nail abutting device. The problem that in the prior art, in the suture process between an artificial blood vessel and an artery blood vessel, no special medical instrument can meet the use requirement is solved. The blood vessel end side anastomat based on the lining is reasonable in structural design and can extend into an artificial blood vessel, a suture structure is directly formed between the artificial blood vessel and an artery blood vessel, and suture between the artificial blood vessel and the artery blood vessel is achieved at a time. The suturing efficiency is improved, the suturing effect of the suturing position is guaranteed, the anesthesia time of a patient is shortened, and then damage to the patient is reduced.

Vascular blood flow modulation is disclosed using metallic compliance-enhancement devices that contain a sealed volume of fluid. The device includes a first elongated inflatable nitinol balloon and a second elongated inflatable nitinol balloon, each having an outer sealed terminus and an inner open fluid port, and a nitinol connector tube that fluidly couples the balloons and has a diameter smaller than the inflated diameters of the balloons. The first balloon is positioned within an arterial vessel and the second balloon is positioned within a venous vessel, with the connector tube spanning between the vessels. During systole, arterial pressure compresses the first balloon to drive fluid through the connector tube into the second balloon, thereby expanding the second balloon and increasing venous blood flow. Cyclic systolic and diastolic pressure variations cause fluid to shuttle between the balloons, producing a compliance-enhancing effect.

The application discloses an artificial blood vessel stent with anticoagulation performance and a construction method thereof. After a pig heart aorta blood vessel is subjected to decellularization treatment, a pre-gel solution is prepared by compounding polyvinyl alcohol and methacrylated gelatin, a designed model is printed into a hollow tubular mold by using 3D printing, the pre-gel solution is injected into the mold to obtain an artificial blood vessel stent with controllable shape and size after cross-linking, and finally, the artificial blood vessel stent loaded with heparin is obtained by loading the heparin on the prepared stent. The material for preparing the pre-gel solution is selected, and the advantages of the material functions can be complemented. The decellularized matrix is beneficial to cell adhesion, proliferation and differentiation; the compounding of polyvinyl alcohol and methacrylated gelatin improves the mechanical properties of the stent and improves the cell adhesion. The heparin is loaded on the artificial blood vessel stent to improve the anticoagulation performance of the stent and prevent the formation of thrombus. The stent serves as an excellent biomedical material and has a wide application prospect in the fields of cardiovascular tissue engineering and biology.

Systems and methods are provided for reducing the reliance on operator skill during vascular ultrasound procedures. The placement of an ultrasound probe to assess perfusion associated with a wound may be facilitated by receiving input suitable for identifying an anatomical region associated with the wound and providing an indication of a suitable initial probe position, and optionally, probe orientation, for acoustically interrogating a target arterial vessel known to provide perfusion to the anatomical region associated with the wound. Regions exhibiting arterial flow may be detected as the probe is moved, enabling arterial vessel detection and localization. A subregion within the detected arterial vessel and a beam steering angle may be autonomously determined for spectral Doppler data collection, enabling the measurement of hemodynamic measures associated with the arterial vessel. Example apparatus for securing the probe to the patient and facilitating probe positioning to search for a target vessel are disclosed.

Described are methods and systems for transcervical access of the cerebral arterial vasculature and treatment of cerebral occlusions, including ischemic stroke. The methods and devices may include methods and devices which may provide aspiration and passive flow reversal, those which protect the cerebral penumbra during the procedure to minimize injury to brain, as well as distal catheters and devices to remove an occlusion. The methods and devices that provide passive flow reversal may also offer to the user a degree of flow control. Devices and methods which provide a way to securely close the access site in the carotid artery to avoid the potentially devastating consequences of a transcervical hematoma are also described.

An aortic arch brachial artery vascular stent belongs to medical consumables and is a covered stent, including a main stent and two branch stents. One end of the two branch stents is embedded in the front end of the main stent. The front end of the main stent is provided as a connector connected to the branch stent. One end of the connector is an integrated structure with the main stent, and the other end is closed and provided with a skirt extending outward. Two through holes arranged in parallel are provided in the skirt. One end of the branch stent is a connecting end, which passes through the through hole of the skirt and goes deep into the connecting end of the main stent. A limiting structure is provided at the connecting end of the branch stent. The present invention is novel in concept and ingenious in design. When applied to the innominate artery of the aortic arch, it can effectively reduce the difficulty of surgical placement of the covered stent, shorten the operation time, and improve the success rate.