28 results about "Stent deployment" patented technology

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.

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.

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.

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.

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 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.

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 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.

The invention belongs to the field of medical instruments, particularly relates to a double-layer thrombus extraction stent, and provides the following scheme aiming at the problems that an existing thrombus extraction stent is large in damage to blood vessels, thrombus remains and poor in adaptability, a main body of the double-layer thrombus extraction stent is made of a nickel-titanium alloy material, and the double-layer thrombus extraction stent comprises a handle, a double-layer mesh cage stent, a core wire, a conical flexible head and a catheter. The head is of a conical flexible structure, and friction damage to the blood vessel wall is reduced. According to the inner-layer and outer-layer mesh cage support, outer-layer large meshes capture large thrombus, inner-layer small meshes capture small-particle thrombus, and the removing efficiency is improved. The puller is exquisite in design, a doctor presses a button and pushes a push block to control the support to unfold and contract, and scale marks of a handle assist in accurate operation. The nickel-titanium alloy enables the stent to adapt to vascular expansion, and the stent has a temperature control memory function. The thrombus extraction stent improves operation safety, thrombus removal efficiency and treatment success rate, can be accurately controlled and adapted to different blood vessels, and reduces complications and thrombus residual risks.

This invention discloses a highly adaptable left atrial appendage occluder, relating to the field of medical device technology. The key technical features are: a proximal external pin with an internal cavity is provided at the center of the proximal end of the occluder; a proximal internal internal pin with an internal cavity is fixedly installed inside the proximal external pin; the inner wall of the proximal internal pin has threads for adjustment and limiting; a threaded disc is inserted into the internal thread of the proximal internal pin; a sleeve is fixedly connected to the surface of the threaded disc; a rotating sleeve is rotatably connected to the outer side of the sleeve via a bearing; and a guide is provided inside the sleeve. The snap-fit ​​structure at the top of the sheath allows for the connection of a threaded disc and a sleeve via an internal thread on the proximal inner pin. A rotating sleeve is connected to the outside of the sleeve via a bearing. Deformation strips and bending strips are used on the outside of the rotating sleeve to connect the support rod and the occluder bracket. The snap-fit ​​structure, in conjunction with the delivery system, allows the threaded disc to slide within the proximal inner pin. Under the constraint of the limiting structure, the support rod drives the occluder bracket to unfold. This allows for the limitation of the unfolding range of the occluder bracket, making it more adaptable to occlusion of left atrial appendages of different sizes.

To provide an uncaging stent.SOLUTION: A stent (scaffold) or other luminal prosthesis comprising circumferential structural elements provides high strength after deployment and allows the scaffold to uncage, and / or allow a scaffold or luminal expansion thereafter. The circumferential scaffold may be formed from degradable material, or may be formed from non-degradable material, and will be modified to expand and / or uncage after deployment. The scaffold may have a plurality of circumferential rings patterned from a non-degradable material, and may be configured to expand from a crimped configuration to an expanded configuration.SELECTED DRAWING: Figure 25C

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.