170 results about "Branch vessel" patented technology

The invention provides a covered stent system, which comprises: a) a covered stent comprising: i) a positioning assembly; ii) a first branch blood vessel windowing assembly, wherein the first branch blood vessel windowing assembly comprises a first sealing area and a first adjusting area; the first sealing area 111 comprises a third opening; the first adjusting area comprises a first opening, a second opening, a first reinforcing structure and a second reinforcing structure; and b) a first branch covered stent, wherein the first branch covered stent is used for being released in the first branch blood vessel windowing assembly.

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 discloses a branch intravascular stent, and belongs to the technical field of medical instruments. Comprising a cylindrical branch covering film main body and a branch bare stent fixed on the branch covering film main body, a disc-shaped bottom covering film is in butt joint with the lower end of the branch covering film main body; the plum blossom bare stent is fixed on the lower side surface of the bottom covering film; the felt covers the upper side surface of the bottom covering film; a plurality of anchoring needles arranged around the center of the bottom covering film penetrate through the bottom covering film and the felt; the lower ends of the anchoring thorns are buckled on the plum blossom bare support, and the upper ends of the anchoring thorns exceed the felt and are provided with barbs inclining downwards. The branch intravascular stent is independent relative to the main intravascular stent, can be replaced or adjusted at any time, and has good adaptability; the detachable and adjustable felt ring has better sealing performance, so that the surgical operation difficulty can be reduced, and the surgical time can be saved; the anchoring thorns are fixedly connected with all parts of the branch intravascular stent and can be anchored into the main intravascular stent and the native blood vessel, and the problem of displacement of the subsequent branch intravascular stent is solved.

A vascular image processing method performed by a processor includes extracting, from a vascular image, a first vascular region corresponding to an entire blood vessel included in the vascular image, a second vascular region corresponding to a target vessel and one or more branch vessels connected to the target vessel, and a third vascular region corresponding to the target vessel, and predicting a vascular structure in the vascular image, based on the first vascular region, the second vascular region, and the third vascular region, which are extracted from the vascular image.

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.

Devices, systems and methods for filtering embolic particles that may be generated from a medical procedure including protection of the major branching vessels from the aorta, and catches and filters emboli that may be generated during the TAVR procedure. The filter devices disclosed herein form an improved seal against the vessel wall that is activated by flowing blood. Devices described herein also allow for the closing of the ends of the filter device after capture of emboli, providing further security against accidental loss of emboli post capture.

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 relates to a branch blood vessel endoluminal repair system which comprises at least two guide wires and a support conveying device, the support conveying device comprises an outer sheath tube and a film covering tube which are connected in a sleeved mode, and the film covering tube comprises a main body part connected to the at least two guide wires in a sleeved mode. The main body part and the at least two branch parts are connected to the guide wires in a sleeving mode in a one-to-one correspondence mode, the film covering pipe is provided with a containing position and a working position, the film covering pipe is folded to the inner side of the outer sheath pipe at the containing position, and the main body part and the branch parts move to the outer portion of the outer sheath pipe at the working position, so that the main body part and the branch parts form a cavity channel used for implanting a support. By means of the technical scheme, the branch blood vessel intracavitary repair system can solve the problems including but not limited to iliac artery lesions (such as dilatation and stenosis lesions), the application requirement suitable for a complex blood vessel structure is met, and the applicability is high.

The invention provides an intraoperative guiding device which comprises a guiding pipe fitting and a control handle, and the near end of the guiding pipe fitting is connected with the far end of the control handle; the guiding pipe fitting comprises an outer pipe and an inner pipe, a bent pipe section is arranged at the far end of the outer pipe, and the inner pipe is at least partially arranged in the outer pipe and can slide in the axial direction of the outer pipe; a side hole is formed in the side wall of the outer pipe, a branch pipe is arranged on the side wall of the inner pipe, and the branch pipe of the inner pipe penetrates out of the side hole and can slide in the axial direction of the side hole. The bent tube section and the branch tube can be respectively placed in different branch blood vessels after entering the blood vessels, so that the contrast agent can quickly reach different blood vessels, the guide tube can continuously indicate the positions of the blood vessels after the contrast agent is introduced, and the use frequency and dosage of the contrast agent are reduced.

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.

An endovascular branch coupler stent graft includes a tubular stent assembly defining a central opening and four branch channels disposed in the central opening and attached to the tubular stent assembly. The four branch channel extends along the length of tubular stent assembly. Each branch channel is configured to receive a covered stent for catheterizing a branch vessel. Similarly, the central opening configured to receive a primary stent graft for reinforcing weakened sections of a subject's aorta.

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 invention provides an intraoperative guiding device which comprises an inner tube, an outer tube and a control handle, and the control handle is connected with the near end of the inner tube and the near end of the outer tube. The far end of the outer tube is provided with a bent tube section, and the inner tube is at least partially arranged in the outer tube and can slide in the axial direction of the outer tube. A side hole is formed in the side wall of the outer pipe, a branch pipe is arranged on the side wall of the inner pipe, and the branch pipe of the inner pipe penetrates out of the side hole. The sliding block can axially slide along the side hole; the bent tube section and the branch tube can be respectively arranged in different branch blood vessels after entering the blood vessels, so that the contrast agent can quickly reach different blood vessels, and the total release amount of the contrast agent is reduced; the control handle can control the branch pipe to swing and incline towards the two axial ends, so that the bent pipe section and the branch pipe can be arranged in branch blood vessels in different planes in a wall attaching mode, after contrast agents are filled, the pipe fitting is guided to conduct indication development on the blood vessels, and a user can conveniently and rapidly position the shapes and the position relations of the blood vessels.

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 invention provides a nerve intervention catheter assembly, and relates to the technical field of medical instruments. A flexible head end is arranged at the far end of the catheter main body; a side hole is formed in the side wall of the flexible head end; a guide part is arranged on the flexible head end; a through hole is formed in the middle of the flexible head end, a control guide wire is arranged in the middle of the catheter body in a penetrating mode, and a protruding part with the diameter larger than that of the through hole is arranged on the control guide wire. The flexible head end is arranged, the side hole located beside the through hole is formed in the flexible head end, the side hole is directly aligned with the branch blood vessel, the stent catheter is guided through the flexible head end, the stent catheter penetrates out of the side hole, the stent catheter directly enters the branch blood vessel, the in-place difficulty of the stent catheter is lowered, the operation difficulty is lowered, and the treatment effect is improved.

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.

To provide a device, system, and method for filtering embolic particles that may occur during medical treatment. **Solution**: Devices, systems, and methods for filtering embolic particles that may occur during medical treatment include protecting major branch vessels from the aorta and capturing and filtering emboli that may occur during a TAVR procedure. The filter devices disclosed herein form an improved seal against the vessel wall that is actuated by blood flow. The devices described herein can also close both ends of the filter device after embolus capture, enhancing safety against the unexpected disappearance of captured emboli.

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.

The present invention is applicable to the field of medical devices, and provides a luminal stent, comprising a main stent and at least two legs connected to one axial end of the main stent, the main stent comprising at least one spacing adjustment portion, the spacing adjustment portion being located on the proximal side of the legs, and the spacing adjustment portion being used to adjust the relative spacing between the two axial ends of the main stent. The luminal stent provided by the present invention includes a spacing adjustment portion on the main stent, and the spacing adjustment portion is used to adjust the distance between the two axial ends of the main stent, so that the axial length of the main stent can be changed after the spacing adjustment portion is deformed, so that the end position of the main stent connected to the legs can be extended and abut against the intersection of the main blood vessel and the branch blood vessel, so that the luminal stent can obtain a stable support of the human body's own vascular structure, so that the luminal stent will not be easily displaced even when it is flushed by blood flow.

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.

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.