221 results about "Branch vessel" patented technology

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 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 embodiment of the invention provides a radiofrequency ablation catheter and radiofrequency ablation equipment. The radiofrequency ablation catheter comprises an electrode support capable of contracting and expanding in the radial direction, a connecting tube and a center wire. The near end of the connecting tube is connected with the far end of the electrode support, and the connecting tube is provided with a first cavity channel penetrating through the near end and the far end; the central wire is movably arranged in the electrode bracket and the first cavity in a penetrating manner; a first limiting part is arranged on the center wire, the first limiting part is located in the first cavity channel, and a second limiting part is correspondingly arranged on the inner wall of the first cavity channel; when the first limiting part abuts against the second limiting part and the center wire moves from the far end to the near end, the electrode support is switched from the contraction state to the expansion state. According to the technical scheme, the risk of damaging the blood vessel can be reduced, the precision of selecting the target branch blood vessel by the central wire is improved, and then the ablation efficiency of radiofrequency ablation is improved.

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.

A prosthetic heart valve delivery catheter includes an embolic filter to provide integrated embolic protection to inhibit the release of emboli into the aorta, the aortic arch or branch vessels, and other vasculature during transvascular heart valve replacement procedures. The embolic filter will usually be fixedly or movably attached to a shaft of the delivery catheter proximal of the prosthetic heart valve.

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 covered stent comprises a plurality of stent rings distributed in the axial direction and a covering film, and the covering film comprises a first part and a second part; the stent ring comprises a constraint state and a release state, in the constraint state, the stent ring comprises a constraint release line, the constraint release line stitches the two ends, close to the first part, of the second part, so that a compression space is defined by the first part, and the stent ring is compressed and contained in the compression space in the radial direction; and in the release state, the stent ring compressed in the compression space is expanded and is attached to the second part. Interference between the windowing position and the metal stent can be avoided, and interference between the branch artery covered stent system and the metal stent of the covered stent in the aorta in the placing process is avoided; enough supporting force can be provided in the arch area, and the covered stent in the branch blood vessel is prevented from moving towards the inside of the aortic lumen while the aortic lumen is kept unobstructed.

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 conveying device. The conveying device comprises a main stent conveying pipe and a multi-cavity pipe. The main stent conveying pipe is used for conveying an intravascular stent, and a branch opening is formed in the intravascular stent; the multi-cavity tube comprises a plurality of cavities, the cavities have different axial lengths, the preset guide wire is preset in at least one branch opening, and the multi-cavity tube can reach the branch opening along the preset guide wire to establish a passage from the branch opening to the branch blood vessel. According to the conveying device, the intravascular stent can be conveyed only through the lower limb admission passage, the intravascular stent does not need to be conveyed from the upper limb admission passage, and damage to healthy blood vessels is reduced.

A branched graft method includes securing a first end of a branch graft into a first conduit and subsequently moving the second end into a second conduit. The first conduit may be a branch vessel, such as a renal artery and the second conduit may be a main graft that extends over an aortic aneurysm. The branch graft may be deployed starting at an offset distance from the first end, thereby preventing the deployed portion from insertion into the first conduit and predetermining the insertion length into the target vessel. The first end may then be deployed to secure the first end to the first conduit. A branch graft may be a self-expanding stent graft having one or more ripcords, and / or a serpentine ripcord that enables non-linear deployment of the branch graft, or deployment that does not progress from one end to the opposing end.

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.

Methods for treating a patient using therapeutic renal neuromodulation and associated devices, system, and methods are disclosed herein. One aspect of the present technology is directed to neuromodulating nerve tissue in selected anatomical regions. In one embodiment, the method can include intravascularly advancing an elongate shaft of a catheter to renal vasculature of a human patient and locating a first neuromodulation element of the catheter within a distalmost portion of a main renal artery. The method includes locating a second neuromodulation element of the catheter within a branch vessel of the renal artery distal to a bifurcation at a distal end of the main renal artery. Neuromodulation of the nerve tissue surrounding the selected anatomical treatment locations can inhibit sympathetic neural activity in nerves proximate a portion of a renal artery and / or a renal branch artery proximate a renal parenchyma.

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.

An embolic protection device is disclosed for placement through the descending aorta and over the aortic arch to inhibit emboli release into the aortic side branch vessels while allowing simultaneous access to the aortic valve by at least one interventional and / or diagnostic catheter being introduced from the descending aorta. The filter body comprises a tubular porous mesh material and has an open upstream end to allow entry of blood flow and emboli and an open downstream end to allow entry of multiple catheters. The filter body includes at least one catheter access path parallel to said at least one passage through the filter body, and the filter body has one or more support structures or wires that provide longitudinal stiffness to the device to prevent compression or movement of the filter during a procedure.

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.