14 results about "Stent deployment" patented technology

The present invention provides an easy-to-operate stent delivery system that allows for easy movement or fixation of the electrocautery tip in adjacent tissue layers, i.e., two adjacent lumens within the body, and allows for easy deployment of the stent to connect the holes in the two adjacent lumens formed by the electrocautery tip. [Solution] The stent delivery system according to the present invention is characterized in that a first handle for moving the electrocautery tip is moved or fixed in a fixed tube by a first locking member that operates semi-automatically, and a second handle for moving the outer tube for stent deployment is moved or fixed in a guide rod of the first handle by a second locking member that is actuated by a pulling external force.

This invention discloses a method for predicting stent deployment in cerebral aneurysms, comprising: acquiring vascular images containing cerebral aneurysms and extracting multiple vascular structures related to the aneurysm; encoding each vascular structure as a structural latent variable using a structural encoder; establishing edges based on the anatomical connections of each vascular structure using its structural latent variables as nodes to generate a structural interaction graph, and aggregating information from the structural interaction graph using a graph neural network to obtain global latent variables representing global topological relationships; extracting the geometric features of the aneurysm neck and fusing the aneurysm neck geometric features with the global latent variables; and processing the fused features using a predictive decoder to predict the location point sequence of the aneurysm stent deployment path. This embodiment improves the stability and accuracy of the prediction.

The invention discloses a method for simulating unfolding of an intravascular stent, electronic equipment and a computer readable storage medium, and the method comprises the steps: building a simplified compression model of the intravascular stent in a microcatheter based on the size of the microcatheter, the simplified compression model comprises node particles on a simplified spiral line of a weaving wire and ghost particles on a central axis section of the intravascular stent; acquiring a blood vessel model comprising the target blood vessel segment, wherein the blood vessel model comprises a blood vessel center line and a blood vessel wall; the simplified compression model is arranged along the center line of the blood vessel, the ghost particles are located on the center line of the blood vessel, and the node particles surround the center line of the blood vessel to form a spiral structure; and carrying out geometric shape constraint and physical elastic constraint on the intravascular stent, and simulating an expansion process of the intravascular stent in the target vascular section to obtain an expansion model of the intravascular stent. According to the method provided by the embodiment of the invention, a reliable stent unfolding form can be obtained.

Apparatuses and methods for quickly and accurately positioning a stent within the ostium of a blood vessel so that the entire circumference of the proximal stent edge is within the aorto-ostial landing zone (AOLZ). Any of these methods and apparatuses may include an ostial positioning catheter including an annular sealing balloon, a distal reinforced shaft, and a hypotube extending proximally from a longitudinal side of the distal reinforced shaft. These ostial positioning catheters may be independently operated with a guide catheter and a stent deployment catheter.

The present application relates to a kind of luminal stents, the luminal stent includes tubular body and extension section, the extension section is woven by braided wire, the distal end of the extension section is connected with the proximal end of the tubular body, the extension section gradually away from the central axis of the tubular body from its distal end to proximal end to make the extension section be inclined outward relative to the tubular body, the luminal stent also includes limiting structure, the limiting structure is used to define the inclination of the extension section relative to the tubular body in axial direction.The luminal stent provided by the present application can prevent the proximal end of the extension section from being folded outward relative to the tubular body due to the extrusion force along the radial direction inward at the connection between the extension section and the tubular body during the positioning stage of the luminal stent, which affects the positioning of the luminal stent, and even can cause the injury of blood vessel wall or poor stent deployment.

A system includes a processor circuit in communication with an extraluminal imaging device and an intraluminal imaging device. The processor circuit obtains an enhanced stent deployment extraluminal image and a plurality of intraluminal images. The enhanced stent deployment extraluminal image and the each of the plurality of intraluminal images are associated with locations along a pathway. The pathway is overlaid over an extraluminal image. Based on the locations of the pathway, the processor circuit coregisters the plurality of intraluminal images to the enhanced stent deployment extraluminal image and outputs a screen display of one of the plurality of intraluminal images and the enhanced stent deployment extraluminal image with an indicator identifying the location at which the displayed intraluminal image was obtained. The processor circuit may also determine an expansion score for intraluminal images depicting the stent and identify regions of the stent corresponding to an expansions score below a threshold.

A stent delivery device and a stent system comprising same. The stent delivery device comprises a force-functional component which is arranged at a distal end and is configured to reduce a passive force exerted axially on the distal end of the stent delivery device, wherein the force-functional component is designed to have a structure that dissipates and / or redirects the passive force, and the distance between a distal end of the force-functional component and the distal end of the whole stent delivery device is smaller than or equal to the nominal diameter of a stent delivered by the stent delivery device. By means of providing the force-functional component, the stent delivery device effectively dissipates or redirects the reactive force generated when the distal end of the delivery device touches a vascular wall during a stent implantation process, thereby significantly reducing the force exerted by the stent delivery device on the vascular wall during the stent implantation process. The setting of the distance between the distal end of the force-functional component and the distal end of the whole stent delivery device ensures a safe landing of the distal end of the stent upon initial release, thereby further reducing the possibility of vascular injury during a stent deployment process.

The utility model relates to a supporting foot pad structure and an automatic bounce-off support applying the same. The stand bar and foot pad structure comprises a stand bar and a foot pad, the bottom of the stand bar is concavely provided with a mounting groove, the foot pad is arranged in the mounting groove, the end of the foot pad protrudes out of the bottom of the stand bar, the foot pad is in direct contact with a contact surface, friction loss of a stand bar body is avoided, and durability is improved. The support capable of being automatically bounced off comprises the supporting foot pad structure, the tops of the supporting feet are rotationally connected with the main rod, and the locking assemblies limit movement of the supporting feet when the supporting feet are folded and release limitation after being triggered. The bouncing-off piece drives the bottom of the supporting foot to be away from the main rod after locking is relieved, and the supporting foot is completely unfolded. The support isolates the supporting feet from the contact surface through the protruding design of the foot pads, automatic bounce-off of the supporting feet is achieved in cooperation with the locking assemblies and the bounce-off pieces, the stability of the support in the unfolding process is ensured, abrasion of the supporting feet is reduced, the service life is prolonged, and the support is suitable for shooting equipment, supporting devices and other scenes needing to be rapidly supported.

Devices and methods establish and facilitate retrograde or reverse flow blood circulation in the region of the carotid artery bifurcation in order to limit or prevent the release of emboli into the cerebral vasculature. Devices and methods are configured for procedures performed through a transcarotid approach for performing transcarotid procedures, including carotid angioplasty, stent deployment, and post stent deployment procedures.

This invention discloses an endovascular stent for preventing branch vessel occlusion. The stent includes a proximal end, a distal end, and a mid-section. The stent is a mesh-like structure formed by weaving multiple biocompatible braided filaments with one or more high-density metal wires. The number of filaments in the proximal and distal ends is less than that in the mid-section, and the mesh size in the proximal and distal ends is larger than that in the mid-section. This endovascular stent provides sufficient support while effectively reducing the risk of branch vessel occlusion. The stent is also easier to press into a smaller diameter stent delivery tube, and the filaments at both ends are less prone to tangling during stent deployment.

The invention relates to a partial covered stent for a biliopancreatic duct drainage Notes operation, which comprises an operating handle and a stent body, and the stent body is arranged at the tail end of the operating handle; a first fixing ring is arranged at one end of the bracket body; a connecting support is arranged at the right end of the first fixing ring, and covering films are arranged in the connecting support and the first fixing ring. A second fixing ring is arranged at the right end of the connecting support, the upper end of the second fixing ring is cup-shaped, and the lower end of the second fixing ring extends outwards to form a horn shape. The stent has the advantages that the shape design is reasonable, the horn mouth is expanded in a step shape, the compliance is good, the fixation is firm, the partial covered stent design is adopted, the advantages of a covered stent and a non-covered stent are achieved at the same time, compared with the prior art, the one-step stent deployment process is simpler, the operation time and the requirement for re-intervention are obviously reduced, and the operation efficiency is improved. According to the utility model, the occurrence of adverse events and discomfort of patients are reduced, the risk of radiation exposure is reduced, and the supports of various specifications are arranged, so that various requirements of clinical operation are met.

Embodiments of the present invention provide a self-locking device for stent retrieval, a stent, and a stent retrieval method. The self-locking device for stent retrieval includes a retraction line, which comprises: a retrieval hook coil; a self-locking section connected to the retrieval hook coil; a retraction coil section for winding around the stent body to be retrieved and forming a retraction coil; a self-locking coil assembly section for winding around the self-locking section to form a self-locking coil assembly; and a fixing section for fixing one end of the self-locking coil assembly section away from the retraction coil section to the stent body to be retrieved. The self-locking coil assembly, in conjunction with the self-locking section, utilizes the internal friction of the retraction line to generate resistance against stent unfolding, thereby achieving the function of self-locking the stent in a specified state after compression. This solves the problems of high difficulty, complex structure, and poor reliability in retrieving stents with complex riveted structures.

The invention relates to the technical field of medical supports, in particular to a support with adjustable supporting force. In the support, outer-layer frames and inner-layer frames are alternately arranged in the axial direction, and any outer-layer frame and any inner-layer frame are connected through a plurality of connecting rods. When the support is unfolded, the inner-layer frame is unfolded relative to the outer-layer frame, at the moment, the straight part of the support is of a single-layer structure, and the supporting force of the straight part is small; when the support is folded, the inner-layer frame is folded on the inner ring of the outer-layer frame, at the moment, the folding part of the support is of a double-layer structure, and the supporting force of the folding part is large; by controlling the overlapping area of the outer layer frame and the inner layer frame in the folding part, the supporting force of the folding part can be adjusted, so that the supporting force of different parts of the stent can be adjusted, and the stent can meet the requirements of different stenosis degrees of blood vessels for different supporting forces.

Methods of adjusting the effective length of a stent and prosthetic delivery catheter assemblies are disclosed. The methods include deploying a first portion of a stent from a stent deployment device, deploying a second portion of the stent from the stent deployment device, and shifting the stent deployment device relative to the first portion to change the effective length of the second portion.