41 results about "Stent deployment" patented technology

In part, the disclosure relates to determining a stent deployment location and other parameters using blood vessel data. Stent deployment can be planned such that the amount of blood flow restored from stenting relative to an unstented vessel increases one or more metrics. An end user can specify one or more stent lengths, including a range of stent lengths. In turn, diagnostic tools can generate candidate virtual stents having lengths within the specified range suitable for placement relative to a vessel representation. Blood vessel distance values such as blood vessel diameter, radius, area values, chord values, or other cross-sectional, etc. its length are used to identify stent landing zones. These tools can use or supplement angiography data and / or be co-registered therewith. Optical imaging, ultrasound, angiography or other imaging modalities are used to generate the blood vessel data.

This invention relates to a cardiovascular stent loading sheath and a retraction system for an advancing stent sheath. The cardiovascular stent loading sheath, through the deformation-sealing opening of a deformable element disposed on the sheath tube, achieves the purpose of sealing the sheath opening after stent deployment. This ensures that when the loading sheath retracts across the stent, the sheath end opening does not snag on the stent, effectively preventing stent displacement and reducing surgical risks.

A stent-deployment assembly includes an elongated stent-conveyance tube comprising a hollow longitudinal lumen configured to have a guidewire traverse longitudinally therethrough. The stent is arrange

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 invention discloses an intervention device for releasing medicine, which is characterized in that a stent is of a hollow cylindrical structure capable of shrinking along the radial direction of the stent, and the stent is made of a medical material with a shape memory characteristic; the drug coating is coated on the outer side of the stent; the number of the annular air bags is two, the two ends of the support are each provided with one annular air bag along the edge of the end face, the inner diameter of each annular air bag in the initial state is matched with the outer diameter of the unfolded support, a plurality of hoses are arranged between the two annular air bags in the axial direction of the support, the hoses are arranged in the support, and the two ends of each hose are communicated with the corresponding annular air bags. The inflation inlet is formed in the side wall of one annular air bag, and a check valve assembly is arranged at the inflation inlet. The outer ring of the filled and expanded annular air bag can be tightly attached to the inner wall of the blood vessel, blood is prevented from entering the attached area of the medicine coating and the inner wall of the blood vessel, the amount of medicine washed away by the blood flow is reduced, and the release period of the medicine is prolonged.

A tracheoesophageal fistula blocking stent, characterized in that it comprises an umbrella-shaped stent (1), a mushroom-shaped stent (2) and an intermediate stent (3), wherein the umbrella-shaped stent (1) and the mushroom-shaped stent (2) are connected as a whole through the intermediate stent (3), and the outer surfaces of the umbrella-shaped stent (1), the mushroom-shaped stent (2) and the intermediate stent (3) are all provided with a coating; the intermediate stent (3) is a tubular structure, and its two ends are sealed by the coating, the umbrella-shaped stent (1) is unfolded into an umbrella shape, and the mushroom-shaped stent (2) is unfolded into a mushroom shape. Since the far and near ends of the tracheoesophageal fistula blocking stent of the present invention are single-layer structures, compared with the disc-shaped structure of the vascular occluder, the weight is relatively light, and the risk of tissue necrosis around the fistula is reduced. In addition, the esophageal end is larger than the tracheal end, and the risk of the occluder falling into the trachea is further reduced.

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.

Devices and methods to treat a diseased portion of an aorta. A method of implanting an endoprosthesis within the aorta may include positioning the endoprosthesis within the aorta in a collapsed state with a constraint and deploying the endoprosthesis to the deployed diameter. The aorta has a true lumen and a false lumen due to the aorta having a defect, the true lumen defining a true lumen diameter and the false lumen formed by a false lumen wall defining a false lumen diameter. The deployed diameter of the endoprosthesis is such that the endoprosthesis extends along the true lumen and along at least a portion of the false lumen at a position where the defect is located in the aorta such that the endoprosthesis defines a flow bypass through a diseased portion of the aorta.

The present invention discloses a method for simulating aneurysm virtual stent implantation based on a spring analogy method. The method comprises: reconstructing a three-dimensional model of the preoperative parent vessel and the parent vessel after aneurysm restoration based on clinical imaging data; extracting the centerline of the first vessel to construct a virtual stent initialization model; deploying the virtual stent initialization model using a spring analogy virtual stent fast algorithm to determine the three-dimensional model of the virtual stent after deployment in the individualized vessel; and calculating efficacy evaluation parameters using a fast algorithm based on the arc surface porosity of the virtual stent neck. The present invention can simulate the actual motion of stent deployment and significantly shorten the simulation calculation time and efficacy evaluation time of simulated stent deployment within a vessel, thereby achieving real-time guidance during virtual aneurysm intervention.

A catheter device includes a microguidewire for stent deployment, which is equipped with a stent having electrodes attached inside, and a microcatheter for vascular penetration. A movement path is formed to allow the stent-rod complex deployment microcatheter to penetrate and move, a guide catheter with a movement path formed to allow the stent-rod complex deployment microcatheter to penetrate and move; and a sheath connected to the rear end of the guide catheter, with an insertion path formed for inserting the stent-rod complex deployment microcatheter into the guide catheter. The vascular penetration microcatheter is curved so that its distal end faces outward, and it has a movement path through which an electrode wire can penetrate and move, allowing it to detect electrophysiological signals / activity or apply electrical stimulation not only inside but also outside the blood vessels, enabling more accurate diagnosis and treatment.

A prosthetic heart valve for replacing a native valve includes a collapsible and expandable stent having a proximal end and a distal end, and a valve assembly disposed within the stent, the valve assembly including a plurality of leaflets and a cuff annularly disposed about the stent. The cuff includes a surplus portion capable of forming a sealing structure having a diameter greater than a diameter of the proximal end of the stent when deployed.

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.

A device for deploying a stent includes a motor, a rotating member, a translating member, a first control element and a control unit. The rotating member rotates in response to the rotation of a shaft of the motor. The translating member, coupled to the rotating member, moves longitudinally in response to the rotation of the rotating member. An outer sheath of a catheter is coupled to the translating member and moves longitudinally when the translating member moves longitudinally. The first control element is capable of receiving a first actuation input. The control unit detects the first actuation input received by the first control element; and upon detecting the first actuation input, causes the motor to rotate in a first pre-defined direction to move the translating member in a proximal direction by a pre-defined distance, thereby deploying a stent, mounted on an inner lumen, by the pre-defined distance.

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.

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.

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.

The embodiment of the invention discloses a cerebral aneurysm stent deployment prediction method, which comprises the following steps: acquiring a blood vessel image containing cerebral aneurysm, and extracting a plurality of blood vessel structures related to the aneurysm from the blood vessel image; through a structure encoder, each blood vessel structure is encoded into a structure latent variable; taking the structure latent variable of each blood vessel structure as a node, establishing an edge according to the anatomical connection relationship of each blood vessel structure, generating a structure interaction diagram, and performing information aggregation on the structure interaction diagram by using a graph neural network to obtain a global latent variable for representing a global topological relationship; extracting the geometric features of the aneurysm neck of the aneurysm, and fusing the geometric features of the aneurysm neck with the global latent variables; and processing the fused features by using a prediction decoder, and predicting a position point sequence of an aneurysm stent deployment path. According to the embodiment, the prediction stability and accuracy are improved.

The present invention relates to a design method and stent for an inflatable heterogeneous shape memory polymer vascular stent, comprising selecting a corresponding number of unit cells in the axial and circumferential directions according to requirements, determining the material distribution of two heterogeneous materials and the structural dimensions of the stent; calculating the bending curvature of the hollow slender tube under the action of inflation pressure based on the material distribution and the structural dimensions of the stent; calculating the spatial configuration of the centerline of the hollow slender tube under the action of a concentrated force based on the bending curvature under the action of inflation pressure; and calculating the quantitative relationship between inflation pressure and the deployed diameter of the stent based on the number of unit cells in the axial and circumferential directions and the spatial configuration of the centerline. The technical solution provided by the present invention improves the rationality of the structural design of the shape memory polymer vascular stent. The stent constructed using the method provided by the present application significantly improves the support stiffness and deployment speed during deployment, thereby accelerating the deployment time of the stent and increasing its clinical application value.

The invention relates to the technical field of guide wire guiding, in particular to a disposable guide wire guiding dilator with scales. After an operation silk thread I and a guide wire tube are loosened, a limiting spring rebounds, a sliding limiting block is pulled to move downwards in a limiting groove, an elastic outer plate is driven by an elastic mounting plate to be unfolded, meanwhile, a guide wire tube outer wall expansion support is unfolded to support an affected part, and a flexible surrounding net is attached to the inner wall of a blood vessel to filter fallen plaques; the elastic limiting plate deforms to drive the pressing plate to move downwards to make contact with the micro pressure sensor, generated electric signals are transmitted to the controller, when set parameters are reached, the controller enables the display lamp to emit light for prompting, an operator retracts the adjusting guide wire, and the inner wall of the blood vessel is prevented from being damaged. When the flexible tube body is attached to the inner wall of a blood vessel, an operator pulls the second operation silk thread to enable the second operation silk thread to pull the second fixing block to move downwards, the angle of one end of the flexible tube body is adjusted, the angle of the guide wire can be adjusted through rotating fit of the adjusting assembly and the guide wire tube, and the guide wire tube can move in the blood vessel to facilitate input of an expansion support.

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 utility model relates to the technical field of medical instruments, and discloses a portable multifunctional intravenous thrombolysis box, which comprises a box body and a box cover, a panel is arranged outside the box body, the upper end part of the panel is rotatably connected with the outer wall of the box body, a folding support frame is arranged between the panel and the box body, and when the folding support frame is unfolded, the folding support frame is fixed on the box body. The folding supporting frame supports the panel to be in a horizontal state, and when the folding supporting frame is folded, the panel and the folding supporting frame are both folded on the box body. The medicine dispensing device can solve the problem that in the prior art, an operation platform needs to be prepared during medicine dispensing operation, and operation is troublesome.

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 to treat a diseased portion of an aorta. A method of implanting an endoprosthesis within the aorta may include positioning the endoprosthesis within the aorta in a collapsed state with a constraint and deploying the endoprosthesis to the deployed diameter. The aorta has a true lumen and a false lumen due to the aorta having a defect, the true lumen defining a true lumen diameter and the false lumen formed by a false lumen wall defining a false lumen diameter. The deployed diameter of the endoprosthesis is such that the endoprosthesis extends along the true lumen and along at least a portion of the false lumen at a position where the defect is located in the aorta such that the endoprosthesis defines a flow bypass through a diseased portion of the aorta.

The invention provides an intracranial vein stent and a delivery system thereof.The intracranial vein stent comprises an inner-layer tube, the inner-layer tube is of a four-cavity structure, namely a first cavity, a second cavity, a third cavity and a fourth cavity, the first cavity is hollow, and the second cavity, the third cavity and the fourth cavity are full; the outer layer pipe is arranged on the inner layer pipe in a sleeving manner; and the woven stent is arranged between the inner-layer tube and the outer-layer tube. The four-cavity structure of the inner-layer tube is arranged, the hollow first cavity can contain a guide wire or a medicine delivery channel, the rigidity of the whole structure is reduced, the filled second cavity, the filled third cavity and the filled fourth cavity achieve staged or local pressure control through independent cavity design, and concentrated stress on the vein wall when the woven stent is unfolded is reduced. The outer-layer tube is sleeved on the inner-layer tube to form a sandwich structure, the braided stent is protected and the preset form of the braided stent is maintained in the conveying process, and meanwhile, the trafficability of the system in tortuous blood vessels is improved through sliding fit between the inner layer and the outer layer. The woven stent is arranged between the inner-layer tube and the outer-layer tube, the non-unfolded state of the woven stent is restrained through interlayer space, controllable release is achieved in combination with the self-expansion characteristic, and mechanical damage of a traditional rigid woven stent to the thin-wall vein is avoided.

The utility model relates to the technical field of portable supports, in particular to a self-bouncing type portable support which comprises a telescopic rod set, a connecting assembly installed on the top of the telescopic rod set and at least three supporting legs arranged around the telescopic rod set at equal intervals, a movable sleeve is movably installed on the telescopic rod set in a sleeved mode, and the supporting legs are hinged to the movable sleeve respectively. An automatic bouncing-off assembly used for automatically unfolding the supporting legs is connected between the bottom of the telescopic rod set and the supporting legs. By arranging the telescopic rod group and arranging the hinged supporting legs at the bottom of the telescopic rod group, when the bracket is folded, each supporting leg can be folded to surround the outer side of the telescopic rod group, and meanwhile, the telescopic rod group can be contracted to shorten the whole length of the bracket, so that the volume of the folded bracket is reduced, and the bracket is convenient to carry; moreover, the automatic bounce-off assembly is arranged between the bottom of the telescopic rod set and the supporting leg support, so that when the support is unfolded for use, the supporting legs can be automatically bounced off under the action of the automatic bounce-off assembly, and the support can be conveniently unfolded for use.

The application relates to a part-coated stent for biliary and pancreatic duct drainage Notes operation, which comprises an operating handle and a stent body, the tail end of the operating handle is provided with the stent body; one end of the stent body is provided with a first fixing ring; the right end of the first fixing ring is provided with a connecting stent, and the inside of the connecting stent and the first fixing ring is provided with a coating; the right end of the connecting stent is provided with a second fixing ring, and the upper end of the second fixing ring is cup-shaped, and the lower end extends outward in a trumpet shape. The application has the advantages that the shape design is reasonable, the trumpet mouth is enlarged in a stepped manner, the compliance is good, the fixation is firm, the part-coated stent design has the advantages of both the coated stent and the non-coated stent, compared with the prior art, the stent deployment process is simpler, the operation time and the requirement for re-intervention are significantly reduced, the occurrence of adverse events and the discomfort of patients are reduced, the risk of radiation exposure is reduced, and the stent with multiple specifications facilitates clinical operation of various requirements.

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.