125 results about "Branch vessel" patented technology

The invention provides a coronary artery three-dimensional reconstruction method based on a foresight intravascular ultrasound image sequence, and the method comprises the steps: carrying out the lumen segmentation of a foresight intravascular ultrasound image frame sequence, recognizing a blood vessel branch opening, and marking a branch frame; the method comprises the following steps: acquiring coordinates of an initial blood vessel center line and a blood vessel edge point based on a lumen contour, constructing a four-dimensional control point associated with a space coordinate and a radius, and carrying out joint optimization on a three-dimensional blood vessel trajectory and the radius by adopting a spline function of a cost function balance data fitting error and trajectory smoothness; calculating a matching error based on the physical length of the branch blood vessel, circularly matching the branches in the image frame sequence and the branches of the optimized blood vessel center line, realizing automatic key point alignment and determining the spatial position distribution of the frame sequence; sparse lumen contour points are converted into a continuous voxel gray field through distance weighted interpolation, the implicit surfaces inside and outside a lumen are defined by combining a symbol distance function, and a smooth and continuous three-dimensional blood vessel model is obtained through reconstruction by adopting an advancing cube algorithm.

The invention relates to the technical field of blood vessel stenosis grading, in particular to a blood vessel stenosis degree grading system based on coronary angiography images. The method comprises the following steps: dividing a vascular skeleton line of an angiography image into vascular segments based on a bifurcation point, and determining a stenosis point on the vascular segment according to the blood flow velocity difference of the vascular segment at the front edge position of a contrast agent in each frame of angiography image and a neighborhood angiography image; according to the blood vessel diameter difference between each bifurcation point and the other bifurcation points and the distance between the other bifurcation points and the main blood vessel section, a reference adaptation degree is obtained, a reference point of each bifurcation point is selected, and according to the blood flow speed difference between each bifurcation point and the branch blood vessel section of the reference point and the reference adaptation degree, narrow points in the bifurcation points are screened; and grading the blood vessel stenosis degree based on the blood vessel diameter of the stenosis point. The blood vessel skeleton line is divided into two conditions of the blood vessel segment and the bifurcation point to analyze the blood vessel physiological stenosis position, and the accuracy of positioning the pathological stenosis position in the coronary artery is improved.

The invention discloses a windowing covered stent blood vessel conveying system, and belongs to the field of medical instruments, the windowing covered stent blood vessel conveying system comprises a fixing rod, a membrane sleeve, a fixator and a handle assembly, and the fixing rod is provided with a convex part used for being connected with a windowing covered stent blood vessel in a matched mode; the membrane sleeve is used for covering a windowing covered stent blood vessel, and a plurality of wire penetrating holes are formed in the two sides of the membrane sleeve. The fixer is flexibly connected with the fixing rod; according to the fixing device, connection with the windowing covered stent blood vessel is achieved through the fixing rod and the fixing device, excessive shortening of the windowing covered stent blood vessel can be prevented in the constriction and release process, the released windowing covered stent blood vessel is distributed more evenly, and in addition, the fixing device can be used for fixing the windowing covered stent blood vessel. By means of the branch blood vessel positioner, accurate positioning of the branch blood vessel can be achieved conveniently, and the problem that the branch blood vessel is difficult to align is solved.

The invention provides a covered stent and a stent system.The covered stent comprises a main stent body and a wrapping part, the main stent body comprises a main corrugated ring and a main covering film, the main corrugated ring is covered with the main covering film, and the wrapping part is connected to one side of the main stent body; the wrapping part wraps the main body stent in a releasable mode so that the main body stent can be compressed or unconstrained in the radial direction, the width of a certain position of the wrapping part is defined as W, and the perimeter of the covered stent at the position corresponding to the width W of the wrapping part is defined as C when the covered stent is in a natural expansion state, the relation between W and C meets the condition that W is smaller than or equal to C / 4. W is less than or equal to C / 4, so that the semi-constraint degree of the covered stent can be ensured, the stent can be repeatedly adjusted in the axial direction when being implanted into a blood vessel, and meanwhile, a channel convenient for selecting a branch blood vessel is provided when the covered stent is radially compressed by a wrapping piece, so that the movable space of the channel in the radial direction is not too large.

The covered stent comprises a main stent body and a branch stent body, the main stent body comprises a far-end section, a transition section and a near-end section in the axial direction, a branch connecting opening is formed in the side wall of the transition section, and the branch stent body is connected with the branch connecting opening; the side, connected with the branch connector, of the branch support comprises a steering wave ring, and the steering wave ring can rotate so that the branch support can be bent in different directions in the natural state. When the steering wave ring is connected with the main body support, the steering wave ring has the trend of guiding the branch support where the steering wave ring is located to incline towards one side, the steering wave ring and the branch connecting port are connected in a circumferential rotation mode, and the inclination direction of the steering wave ring can be changed by rotating the orientation of the steering wave ring. When the covered stent is implanted into the body of an implanted person, the turning wave ring can be adjusted according to the obtained relative bending form of the branch blood vessel and the main blood vessel at the target blood vessel position of the user, and therefore the matched covered stent structure is obtained.

The present application discloses a stent graft and a method for navigating the stent graft to a branch vessel, the stent graft comprising a main body and at least one lateral side branch connected to the main body, a stent graft system and a method for implanting the stent graft, including interconnecting the stent grafts.

The application provides an aortic dissection rupture sealing device, which comprises a body having a hollow flow channel extending along the axial direction of the body, the hollow flow channel penetrating the rupture for conducting the true lumen of the aorta and the branch blood vessel, and the body being used for connecting a stent located in the branch blood vessel; and an anchoring part arranged on the body and surrounding the hollow flow channel, and anchored to the surrounding intima at the rupture, so as to prevent the fluid from conducting between the true lumen and the false lumen formed at the rupture. By using the above scheme, the rupture sealing effect can be improved, the continuous expansion of the false lumen caused by the incomplete rupture sealing and the residual liquid leakage can be avoided, and the blood supply stability of the branch blood vessel can be ensured, so that the blood supply demand of the internal organs, the spinal cord and the like supplied by the branch blood vessel can be met.

The application provides an aortic dissection rupture sealing device, which comprises an anchoring part, a hollow flow channel, and an intima around the rupture, so as to prevent the fluid communication between the true lumen of the aorta and the false lumen formed at the rupture; a stent, which is adjustably coupled to the anchoring part, has a connecting end and a free end, and at least the free end of the stent is located in a branch blood vessel; and the stent has a hollow structure in communication with the hollow flow channel and is supported in the branch blood vessel to communicate the true lumen and the branch blood vessel. The above scheme can avoid the continuous expansion of the false lumen caused by the incomplete sealing of the rupture and residual shunt, and at the same time, the blood supply of the blood vessel channel is retained to ensure the stability of the blood supply of the branch blood vessel, which is beneficial to meet the blood supply demand of the internal organs, spinal cord and the like supplied by the branch blood vessel.

The present application is suitable for the technical field of medical devices, and provides a delivery device and a stent system, wherein the distal end of the support tube along its length direction comprises a first tube segment and a second tube segment, the first tube segment is located at the distal end of the second tube segment, the first tube segment comprises a first support structure, the second tube segment comprises a second support structure, and under the same force, the bending degree of the first support structure is greater than that of the second support structure. In the present application, the tube body of the first tube segment at the distal end of the delivery sheath tube has better bending property compared with the tube body at the proximal end, so that the tube body at the distal end can be bent better, so that the whole delivery sheath tube is convenient to bend into the branch blood vessel.

A radiofrequency ablation catheter (100) and a radiofrequency ablation device. The radiofrequency ablation catheter (100) comprises a radially contractible and expandable electrode stent (20), a connecting tube (30), and a core wire (40). The proximal end of the connecting tube (30) is connected to the distal end of the electrode stent (20), and the connecting tube (30) has a first lumen (34) running through the proximal and distal ends thereof. The core wire (40) movably runs through the electrode stent (20) and the first lumen (34). The core wire (40) is provided with a first limiting portion (41), the first limiting portion (41) being located in the first lumen (34); and the inner wall of the first lumen (34) is correspondingly provided with a second limiting portion (35). When the first limiting portion (41) abuts against the second limiting portion (35) and the central wire (40) moves from the distal end to the proximal end, the electrode stent (20) is switched from a contracted state to an expanded state. The radiofrequency ablation catheter (100) can reduce the risk of vascular injury, improve the accuracy of the core wire (40) in accessing a target branch vessel, and thus improve the ablation efficiency of radiofrequency ablation.

This invention provides a neurointerventional catheter assembly, relating to the field of medical device technology, comprising a catheter body; a flexible tip at the distal end of the catheter body; a side hole on the sidewall of the flexible tip; a guide portion on the flexible tip; a through hole in the middle of the flexible tip; and a control guidewire passing through the middle of the catheter body, the control guidewire having a protrusion with a diameter larger than the through hole diameter. This invention features a flexible tip with a side hole located next to the through hole, allowing the side hole to be directly aligned with a branch vessel. The flexible tip guides a stent catheter, which then passes through the side hole, enabling the stent catheter to directly enter the branch vessel. This reduces the difficulty of stent catheter placement, thereby reducing surgical complexity and improving treatment outcomes.

The present application relates to the technical field of blood vessel stenosis grading, and particularly relates to a blood vessel stenosis degree grading system based on coronary angiography images. The present application divides the blood vessel skeleton line of the angiography images into blood vessel segments based on bifurcation points, determines the stenosis points on the blood vessel segments according to the blood flow velocity difference of the contrast agent front position of the blood vessel segments in each frame of the angiography images and its neighboring angiography images, obtains the reference adaptation degree according to the blood vessel diameter difference of each bifurcation point and the rest bifurcation points, and the distance between the rest bifurcation points and the main blood vessel segment, selects the reference point of each bifurcation point, screens the stenosis points in the bifurcation points according to the blood flow velocity difference of the branch blood vessel segments of each bifurcation point and its reference point and the reference adaptation degree, and grades the blood vessel stenosis degree based on the blood vessel diameter of the stenosis points. The present application divides the blood vessel skeleton line into blood vessel segments and bifurcation points to analyze the physiological stenosis position of the blood vessel, and improves the accuracy of positioning the pathological stenosis position in the coronary artery.

The covered stent comprises a first stent body, a second stent body and a covering film, the covering film and the first stent body are combined to form a lumen structure with the two ends open and the middle provided with a groove, the first stent body comprises a plurality of first wave rings and at least one second wave ring, the first wave rings are located at the two ends of the first stent body, and the second wave rings are located at the two ends of the second stent body. The second wave ring is located in the middle of the first support and is opposite to the groove in the radial direction. The second stent is of a net-shaped structure formed by weaving metal wires or cutting a metal tube, or the second stent comprises a plurality of third wave rings arranged at intervals or non-intervals, at least part of the second stent is contained in the groove and connected with the first wave rings or the covering film, and the second stent has the radial supporting performance; a distance is kept between the bottom surface of the groove and the opening of the branch blood vessel. The covered stent can avoid or slow down the opening, attached to the branch blood vessel, of the bottom face of the groove.

The present application provides a stent for intravascular placement that can balance the blood flow preservation of a branch vessel and the embolism of a tumor mouth. The stent for intravascular placement has a tubular strut (11) that can be expanded in diameter, and a polymer film (21) that covers the entire strut (11). A plurality of through-holes (22) are formed in the polymer film (21), the through-holes (22) communicate the inside of the cylinder of the stent for intravascular placement with the outside of the cylinder, the opening size is 0.02 mm or more but 0.2 mm or less, the opening occupancy rate is 25% or more but 41% or less, and the division surface density is 9.5 / mm or more but 30 / mm or less.

To provide simple yet accurate stent graft fenestration, a patient-specific fenestration template is used as a guide for graft fenestration. To generate the fenestration template, a patient's medical imaging data such as CT scan data may be used to generate a 3-D digital model of an aorta lumen of the patient. The aorta lumen may encompass one or more branch vessels, which may be indicated on the 3-D digital model. Based on the 3-D digital model or a segment thereof, the fenestration template may be generated, for example, using 3-D printing technology. The fenestration template may include one or more holes or openings that correspond to the one or more branch vessels. To fenestrate a stent graft, the fenestration template is coupled to the stent graft so that the holes or openings on the fenestration template indicate the fenestration locations.

The present application relates to a kind of three-dimensional blood vessel branch cross-sectional area and included angle calculation method and system, belong to medical image technology field, including obtaining the outline of main blood vessel and branch blood vessel, and determine the connecting point of main blood vessel and branch blood vessel, three-dimensional branch outer contour and the initial normal vector of branch section, determine its position at branch connection and the intersection section of branch section and branch outer contour;Equivalent two-dimensional branch section contour is obtained by rotating three-dimensional branch section contour, the area of two-dimensional branch section contour is calculated;A series of branch section area and the normal vector corresponding thereto are obtained;The minimum branch section area is taken as the cross-sectional area of this section branch blood vessel, and the included angle of branch blood vessel and main blood vessel is determined, the present application not only can confirm the outline of main blood vessel and branch blood vessel in two-dimensional space, can also carry out three-dimensional branch modeling and its accurate quantification, further analysis and calculation obtain the cross-sectional area of branch blood vessel in three-dimensional space and its included angle with main blood vessel.

The present application relates to a protection system, which comprises: at least one protection sheath, which comprises an outer sheath tube and a filter arranged at the distal end of the outer sheath tube; the outer sheath tube has a first lumen, and the filter has a proximal opening and a distal opening, the distal opening is communicated with the first lumen through the proximal opening; a filter bypass device, which has an input port and an output port, the input port is communicated with the first lumen; at least one return tube, the proximal end of the return tube is communicated with the output port, and the distal end of the return tube is used for returning the filtered blood to the human body. The protection system of the present application can protect the branch blood vessels during the expansion of the branch stent, and can return the filtered blood to the human body, thereby reducing the blood loss of the patient during the operation.

Provided are a pulmonary artery thrombectomy apparatus and a thrombus removal system. The thrombectomy apparatus comprises: a thrombectomy stent (1) and a delivery catheter (2). The thrombectomy stent (1) is connected to a stent tip (3), and the stent tip (3) is limitedly exposed at a distal port of the delivery catheter (2). The stent tip (3) is provided with a wire guiding channel (33), and the wire guiding channel (33) comprises a tip inlet (33a) and a lateral outlet (33b). The stent tip (3) comprises a tapered tip (31), or the stent tip (3) comprises an eccentrically bent tip (32), and the stent tip (3) is detachably connected to the distal end of the thrombectomy stent (1). The thrombectomy apparatus can solve the problem of an excessively large outer diameter of the delivery catheter of a pulmonary artery thrombectomy stent. By not providing a wire guiding lumen on the thrombectomy stent (1) and the delivery catheter (2), the outer diameter of the delivery catheter (2) when the thrombectomy stent (1) is pressed and held in the delivery catheter (2) is reduced. This enables the thrombectomy stent (1) and the delivery catheter (2) to be delivered to more distal sites of the pulmonary artery or branch vessels of the pulmonary artery, and facilitates the release of the thrombectomy stent (1) after passing through a thrombus, thereby avoiding the escape of the thrombus.

The application discloses a noninvasive calculation method of coronary microcirculation resistance and resistance index, and the method comprises the following steps: firstly, based on coronary computer tomography angiography data, blood vessel segmentation is carried out by using a U-Net convolutional neural network, and then a personalized 3D coronary stenosis branch vessel model is reconstructed; secondly, the information of multiple blood vessels (physiological parameters such as age, blood pressure and left ventricular volume in the systolic phase) is integrated, and the length, cross-sectional area, volume and other geometric structure parameters of a specific part of the blood vessel are measured and calculated; thirdly, fluid dynamics simulation is utilized to obtain the invasive CMR and IMR; fourthly, correlation analysis is carried out between the characteristic parameters and the CMR and IMR; fifthly, the characteristic parameters with high correlation are selected to carry out machine learning prediction, so as to realize noninvasive calculation of the CMR and IMR. The noninvasive method for evaluating the CMR and IMR can complete measurement in a short time and has high precision, and is convenient and safe.

A bifurcated intravascular stent graft comprises primary stent segments and a primary graft sleeve, forming a main fluid channel and having a side opening therethrough. An external graft channel formed on the primary graft sleeve has a first end communicating with the side opening and an open second end outside the primary graft sleeve, thereby providing a branch flow channel from the main channel out through the side opening and external graft channel. The primary stent segments and graft sleeve engage an endoluminal surface of a main vessel and form substantially fluid-tight seals. The stent graft further comprises a secondary stent graft, which may be positioned partially within the external graft channel, through the open second end thereof, and partially within a branch vessel. The secondary stent graft engages the inner surface of the external graft channel and the endoluminal surface of the branch vessel, thereby forming substantially fluid-tight seals.

This invention discloses an automated multi-parameter assessment method, device, and medium for aortic imaging based on three-dimensional images. The method includes acquiring three-dimensional chest CT images and preprocessing them; extracting and optimizing an initial centerline based on the obtained three-dimensional vascular mask; dividing the initial centerline into ascending aorta, aortic arch, and descending aorta segments using the optimized initial centerline and the opening positions of branches on the aortic arch; extracting the average CT value of the adipose tissue surrounding the descending aorta based on the divided descending aorta segments; constructing orthogonal cross sections, performing dimensionality reduction and projection processing on each cross-sectional mask, and calculating the major and minor axes based on the farthest point pairs, outputting the major axis diameter sequence of each cross section; calculating the aortic calcification load, assessing aortic dilation and morphological variations, and evaluating the inflammatory status of the perivascular adipose tissue; and generating a comprehensive report of indicators. This invention fully utilizes existing imaging resources, improving the utilization efficiency and clinical value of medical imaging data.

An apparatus for performing a medical procedure in a main vessel, includes an inflatable perfusion balloon forming an internal passage for allowing fluid flow within the vessel when the balloon is inflated. A shaft connected to the balloon includes an inflation lumen in communication with the perfusion balloon, and a working lumen including an opening for passing a tool, such as a needle for puncturing the vessel. An indexing balloon may be provided for expanding into a branch vessel to orient the working lumen in the direction of the branch vessel, such as to allow for an incision to be made at a desired location for achieving a by-pass. The perfusion balloon may be adapted for receiving a distal end portion of the shaft, which may include an outlet of the working lumen substantially flush with the external surface. Related methods are also disclosed.

This invention relates to a vascular stent for the visceral region of the abdominal aorta, comprising an interconnected proximal non-degradable segment and a distal degradable segment. The proximal non-degradable segment includes a non-degradable metal skeleton and a covering structure. The distal degradable segment is a degradable bare skeleton. The proximal non-degradable segment corresponds to the location of the primary tear in the visceral region of the abdominal aorta, and the distal degradable segment corresponds to the location of branch vessels in the visceral region of the abdominal aorta. This invention is applicable to abdominal aortic dissection anatomical features, where the proximal stent segment is non-degradable and covered, while the distal visceral segment is degradable but not covered. It promotes false lumen thrombosis by sealing the primary tear through covering, while maintaining patency of branch vessels in the visceral segment by not covering. Simultaneously, a drug layer is attached to the covering of the proximal stent segment to actively promote intimal repair.

The invention relates to a branch blood vessel parameter obtaining method and device, electronic equipment and a readable medium, and the method comprises the steps: obtaining a medical image, and recognizing a first region image in the medical image through a first preset model; selecting a plurality of candidate image frames from the first area image, and obtaining a second area image according to the plurality of candidate image frames; filtering the false positive region image from the second region image by using a second preset model to obtain a third region image; and calculating measurement parameters of the target branch blood vessel in the third area image by using a third preset model. The method comprises the following steps: firstly, extracting a regional image possibly containing a branch blood vessel from a medical image, then, carrying out fine identification analysis on the regional image to filter out a false positive region in the regional image so as to obtain a branch blood vessel image, and finally, detecting measurement parameters of the branch blood vessel from the branch blood vessel image. The problem that it is difficult to accurately recognize the measurement parameters of the branch blood vessels in the medical image is solved.

The application belongs to the technical field of medical devices, and particularly relates to a covered stent, which comprises a stent body and a covering arranged on the stent body, wherein the stent body comprises a keel, a wave ring assembly and a sleeve joint assembly for connecting the keel and the wave ring assembly; the wave ring assembly comprises at least one curved section connected to the keel, and the curved section comprises a plurality of curved wave rings arranged on the keel in sequence; the sleeve joint assembly comprises a plurality of curved sleeves for connecting adjacent curved wave rings; and the wave ring assembly further comprises a windowing section for puncturing the covering. According to the covered stent, puncturing can be performed on the windowing section to adapt to the branch vessels on the aortic arch, and according to the shape of the vessels, the covered stent can be arranged in a preset curved shape through the curved sleeves, so as to reduce the pressure of the covered stent on the inner wall of the vessels, reduce the stimulation of the covered stent on the vessels and prevent new vessel breaks.

The invention discloses a CT-guided coronary artery calcified plaque and blood vessel deformation analysis method, and relates to the field of cardiovascular disease diagnosis and treatment. The method comprises the following steps: S1, measurement of aorta root reference parameters and coronary artery opening spatial position; S2, quantitative analysis of coronary artery length and deformation curvature; S3, coronary artery calcified plaque form and three-dimensional reconstruction; S4, calcified plaque lumen occupancy and occlusion section calcification evaluation; through detailed CT guidance analysis, the method comprises the steps of aorta root reference parameter measurement, coronary artery length and deformation curvature quantification and calcified plaque form and three-dimensional reconstruction, the anatomical structure and the lesion condition of the coronary artery can be accurately evaluated, the high-precision diagnosis method helps doctors to more accurately know the illness state before an operation, and the diagnosis accuracy is improved. And a more reasonable operation scheme is formulated, so that the success rate of an operation and the prognosis effect of a patient are improved.

This application provides a method and system for in vivo stent orientation based on the principle of spatial reversal, relating to the field of vascular interventional technology. The method includes: during the advancement of a main stent delivery system carrying an integrated branch stent along an ultra-rigid guidewire towards the aortic arch, acquiring the orientation information of the delivery system and its contact force information with the vessel wall; then comparing the orientation information with a spatial reference path, and determining the entry point into the curved section of the aortic arch based on the comparison results; generating a reversal speed adjustment amount based on the deviation of the delivery system's orientation from the branch vessel opening direction, the vessel curvature, and the contact force information; finally, controlling the delivery system to rotate synchronously during advancement based on this adjustment amount, gradually adjusting the orientation of the branch stent from a preset position to directly facing the opening of the left subclavian artery, while dynamically adjusting the advancement speed according to the contact force information to maintain the contact force within a preset safe range. This application improves the accuracy and operational safety of in vivo stent orientation.

This invention relates to a covered stent, comprising a main stent and an auxiliary stent. Along the axial direction of the covered stent, the main stent includes a distal covered segment, a bare stent segment, and a proximal covered segment connected sequentially. The auxiliary stent is detachably disposed within the main stent and includes a connected auxiliary body and at least one embedded branch. The distal end of the auxiliary body communicates with the distal covered segment, and the proximal end of the auxiliary body communicates with the proximal covered segment. The distal covered segment, the auxiliary body, and the proximal covered segment together define a main channel. Along the radial direction of the covered stent, a spacer is defined between the outer peripheral surface of the auxiliary body and the inner wall surface of the bare stent segment. Each embedded branch connects the main channel and the spacer. According to the covered stent of this invention, since the mesh at any position along the circumference of the bare stent segment allows blood flow, there is no problem of branch vessels being blocked due to circumferential positional deviation after the main stent is deployed.

The present invention relates to a balloon catheter for delivering a branching stent to a branching vessel. The balloon catheter includes a hub, a shaft, a single balloon connected to the shaft, and an inflation port of the hub that is in fluid communication with the single balloon, the single balloon including a first distal portion, a second central portion, and a third proximal portion, the delivery configuration being such that the first distal portion of the balloon and the third proximal portion of the balloon are adjacent to each other by bending the first distal portion of the balloon to the third proximal portion of the balloon.

An endoprosthesis system including branch features and fenestration features for perfusion of branch vessels, such as the renal, superior mesenteric, and celiac arteries.