227 results about "Stent implantation" patented technology

The invention discloses a method for training a prediction model for predicting blood vessel deformation after stent implantation. Comprising the following steps: respectively performing three-dimensional reconstruction processing on acquired pre-operation brain image data before stent implantation and post-operation brain image data after stent implantation to obtain a pre-operation blood vessel model and a post-operation blood vessel model; mapping the pose information of the stent in the postoperative craniocerebral image data to the preoperative blood vessel model to generate a stent model; constructing a target vascular graph structure based on the preoperative vascular model and the stent model, and constructing a target stent graph structure based on the stent model; a first node on the target vascular graph structure carries first physical coding information; a second node on the target support graph structure carries second physical coding information; and inputting the target blood vessel graph structure, the target stent graph structure and the postoperative blood vessel model into a graph neural network model for training until a set training ending condition is reached, thereby obtaining a prediction model. The rapid and accurate prediction of the blood vessel deformation after the stent is implanted is realized.

The invention relates to the technical field of medical engineering, in particular to a hemodynamic simulation analysis system for coronary stent implantation. The system comprises a coronary blood vessel anatomical structure aided design module, a coronary stent finite element model design module, a post-implantation hemodynamic simulation analysis module and a pre-implantation and post-implantation blood flow state evaluation module, and can obtain coronary medical image data of a patient and perform blood vessel anatomical structure geometric analysis and blood vessel three-dimensional model aided design. Generating a three-dimensional model of the coronary vessel anatomical structure of the patient; a coronary stent finite element model is designed and generated through a geometric feature set of the coronary stent, a hemodynamic feature parameter set before stent implantation is obtained, blood flow boundary limitation analysis and coronary stent implantation dynamics simulation analysis are carried out, and meanwhile blood flow state evaluation analysis before and after stent implantation is carried out. And generating a blood flow state simulation evaluation report before and after stent implantation. According to the method, the change of the blood flow state after the stent is implanted can be efficiently and accurately analyzed.

The utility model discloses a rear release covered stent and a rear release system of the covered stent. According to the post-release covered stent, a bare stent part in an existing covered stent is omitted, the wave crest of the near-end first-section wave-shaped stent is not sewed with the covering film, and after the near-end first-section wave-shaped stent is compressed, the wave crest can extend out of the edge of the near end of the covering film by a certain distance; and the extended stent part is used as a hanging unit to be matched with the conveyor to finish the post-release of the covered stent. Meanwhile, when the wave crest of the first corrugated stent extends out of the edge of the near end of the covering film, the extending part is small in size, blood flow disturbance is not caused to branch blood vessels, the risk of thrombus formation is greatly reduced, the overall length of the covering film stent can be greatly reduced, and then the pushing stroke of the stent in a conveyor in the implanting process is shortened. Besides, the middle section and the wave trough position of the first section of corrugated stent at the near end are sewn with the covering film, sewing points are sufficient, the stent can be bound by sewing lines even though fatigue fracture occurs, and the risk of scratching blood vessels is reduced.

The invention belongs to the technical field of medical instruments, and discloses a stent implantation system which comprises a first catheter, a second catheter and a filter, and the first catheter can be sleeved with a stent; the second guide pipe penetrates through the first guide pipe; the filter penetrates through the second guide pipe and comprises a filter body, and the filter body has a folded state and an unfolded state; in the folding state, the filter body penetrates through the second guide pipe; in the unfolded state, the filter body is located outside the second guide pipe, and the first guide pipe can squeeze and store the unfolded filter body. According to the stent implantation system, plaque escape in the operation process is effectively prevented, and the embolism risk is reduced.

A pacing system (100) for wireless extra-cardiac pacing of a heart (303) of a patient (301). The pacing system (100) includes a generator (102), a transmitter (104), and an implant device (106). The generator (102) is configured to generate energy. The transmitter (104) is configured to transmit the energy generated by the generator (102). The implant device (106) including an expandable stent that is configured to be implanted in the heart (303) of the patient (301), the implant device (106) including a receiver (220) that is configured to receive the energy that is transmitted by the transmitter (220), the implant device including a transducer (222) that is configured to transduce the energy into a pacing stimulus that is configured to pace the heart (303).

The invention provides a medical stent and a preparation method thereof.The preparation method comprises the steps that an anti-coagulation coating is arranged on at least part of the surface of the medical stent through physical coating, then an anti-hyperplasia coating is arranged on at least part of the surface of the medical stent through physical coating, the anti-coagulation coating comprises a copolymer, and the anti-hyperplasia coating comprises an anti-hyperplasia coating. A copolymer in the anticoagulant coating contains a zwitterionic unit and an adsorption unit, and the anti-hyperplasia coating contains an anti-hyperplasia drug and a degradable polymer; or, an anti-hyperplasia and anti-coagulation integrated coating is arranged on at least part of the surface of the medical stent through physical coating, the integrated coating contains a copolymer and an anti-hyperplasia drug, and the copolymer in the integrated coating contains a zwitter-ion unit, an adsorption unit and a degradable unit; the adsorption unit is an ester unit containing a carbon-carbon double bond, and the degradable unit is a 2-methylene-1, 3-dioxane unit. The problem that thrombus and restenosis exist at the same time after the stent is implanted can be solved, the binding force between the coating and the substrate is improved, and the falling risk of the coating is reduced.

The utility model relates to the technical field of stent implanters, in particular to a medical stent implanter. Comprising a hose and an adjustable positioning assembly, a working end is provided with a first channel used for installing a support component, the adjustable positioning assembly is provided with a camera and a swing part, the working end can swing in multiple directions, the swing end is composed of a plurality of swing parts, the swing parts are connected in a certain direction and selectively connected with the working end, and the swing parts are provided with supporting faces and form a stress area with the hose. The working end is provided with a second channel along the extending direction, is used for mounting the camera, is parallel to the first channel, is provided with a plurality of accommodating cavities, is used for assembling the swinging part, is divided into a first assembly section and a second assembly section, and is in sealing contact after being assembled, the swinging part is provided with a plurality of mounting point positions, the camera can be connected with the point positions, and the second channel is provided with a flange and is arranged towards the inner side. According to the utility model, visualization and steering of the medical stent implanter can be realized synchronously.

The invention relates to a stent conveying device and a stent system comprising the same. The support conveying device comprises a pushing rod. The force buffering component is arranged at the far end of the pushing rod and comprises at least one force conduction component, a non-zero angle is formed between the force conduction component and the axial center line of the pushing rod, and the distance between the far end of the force conduction component and the whole far end of the stent conveying device is smaller than or equal to the nominal diameter of a stent conveyed by the stent conveying device. When the axial pushing force applied to the near end of the pushing rod enables the near end of the stent conveying device to move in the axial direction by a distance not exceeding half of the axial length of the force conduction component. According to the stent conveying device, the pushing force transmitted to the blood vessel wall can be regulated and controlled, so that the force applied to the blood vessel wall in the pulling and / or pushing process is always in a controllable low force value range, the mechanical stimulation and potential injury risk to the blood vessel wall are reduced, and the stent implantation safety is improved.

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 relates to a vein stent with high flexibility, a far-end woven stent is formed by weaving metal wires with coatings and has high flexibility, and the expansion diameter of the stent is slightly larger than the diameter of a target vein but smaller than that of a near-end laser engraving stent; the far-end woven stent comprises a metal wire and a coating located outside the metal wire, the coating is divided into an inner side coating and an outer side coating, the radian proportion of the inner side coating is larger than that of the outer side coating, and the surface roughness of the inner side coating is smaller than that of the outer side coating; and the group of metal connecting short rods are connected with the near-end laser engraving bracket and the woven bracket through welding. The stent has different structure and mechanical characteristics in vein segments with different anatomy and kinematic mechanics characteristics, is better in targeted adaptability, and can better meet the requirements of stent fixation and cross-joint stent placement in iliofemoral vein stent implantation of patients with non-thrombotic iliofemoral vein stenosis occlusion diseases.

Delivery systems for expandable and stented implants include tensioning members that are attached to rotors with hook-like attachment projections are wound onto the shaft of the delivery system, which is then rotated to unwind the tensioning members and incrementally expand the implant.

The invention discloses a stent with a super-lubricating coating as well as a preparation method and application of the stent, and belongs to the technical field of medical materials. The stent provided by the invention is composed of a stent base material and a super-lubricating coating, wherein the super-lubricating coating is composed of a base material pretreatment layer, a super-hydrophobic layer and a lubricating layer. The porous microstructure constructed on the surface of the stent base material is adjusted, and the compactness of the super-hydrophobic layer and the lubricating layer on the surface of the stent is controlled, so that the long-term and dynamic anti-fouling performance is realized, and the risk of adverse reactions such as infection, thrombosis and restenosis after the stent is implanted is reduced. The coating technology provided by the invention can be applied to various clinically common metal and plastic brackets, and has high clinical value.

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.

The present invention relates to the technical field of medical devices, and specifically to a self-expanding drug-coated vascular stent, which is a mesh tube structure formed by connecting a plurality of main ribs and a plurality of connecting ribs, wherein the plurality of main ribs are evenly distributed along the circumference, and two adjacent main ribs are connected by connecting ribs; when the mesh tube structure is in an expanded state, the main ribs extend in a sinusoidal waveform, the connecting ribs extend in the same direction as the main ribs, the connecting ribs are connected to the side of the main ribs where the crest or trough is protruding, one side of the same connecting rib is connected to the crest of a main rib, and the other side of the connecting rib is connected to the trough of another adjacent main rib; when the mesh tube structure is in an unfolded and flattened state, the plurality of main ribs are parallel to each other, and the connecting ribs extend in a fishbone shape along the extension direction of the main ribs. Different branch ribs of the connecting ribs exert force on the main ribs, so that the axial flexibility of the vascular stent is better, and the instantaneous non-uniform expansion phenomenon of the vascular stent during the expansion process can be effectively alleviated, and the wall adhesion of the stent after implantation can be ensured.

A method of providing embolic protection for carotid stent implantation includes advancing an arterial sheath into an arterial system of a patient and advancing a venous sheath into a venous system of the patient. A fluid connection may be established between the venous sheath and the arterial sheath to enable retrograde flow of blood through the arterial sheath. The artery sheath may be advanced through the vasculature into the patient's carotid artery and the inflatable balloon may be inflated within the patient's carotid artery to block smooth blood flow therein. An interventional tool may be advanced through the interior lumen of the arterial sheath, the interventional tool sized such that a portion of the cross-sectional area of the interior lumen of the arterial sheath remains open for retrograde flow of blood.

The present invention provides a cervical spinal canal expansion and molding bracket and implantation equipment, which relate to the technical field of medical devices. The cervical spinal canal expansion and molding bracket provided by the present invention adopts a first arm having a first connection part connecting to the side mass, and a second arm having a second connection part connecting to the spinous process. The first arm and the second arm are connected by a connecting piece. The relative movement of the first arm and the second arm is adjusted by the connecting piece to change the size of the incision. The bracket can be implanted and fixed in the initial state where the first arm and the second arm are not extended, and after implantation and fixation, the molding bracket can be extended by adjusting the connecting piece, thereby expanding the size of the incision, and then expanding the cross-sectional area of ​​the spinal canal, making it easier to ensure the stability of the implantation process of the cervical spinal canal expansion and molding bracket. The spinal canal expansion size can also be adjusted according to needs, and the surgical operation is more convenient.

The invention discloses a negative Poisson's ratio stent structure for heart and cerebral vessels and an optimization method of the negative Poisson's ratio stent structure, belongs to the technical field of medical instruments, and solves the problems of axial shortening, contradiction between radial supporting force and flexibility and low calculation efficiency in an optimization process of a traditional vascular stent due to a positive Poisson's ratio effect. Wherein a bracket structure of a curved-edge concave hexagonal geometric unit is adopted, and the bracket synchronously extends in the axial direction to present a negative Poisson's ratio effect when being subjected to an expansion load in the radial direction; degradable macromolecules or degradable metals are selected as the material of the stent; according to the optimization method, candidate design is generated through parametric modeling, performance indexes are obtained through finite element simulation, a neural network agent model is trained to predict multi-target performance, a Pareto optimal solution set is obtained through optimization by adopting a multi-target optimization algorithm, and manufacturing parameters are determined through finite element review. According to the invention, the implantation precision and the positioning accuracy of the stent are improved, the mechanical property and the biocompatibility are optimized, and the design efficiency is improved.

In an exemplary example, methods and systems are disclosed herein for treating vascular disease by implanting a stent within a vessel and using intravascular imaging to determine and ensure that the stent is properly implanted and produces the desired and effective results. For example, a system can obtain optical shape sensing data and intravascular imaging data of a vessel. The system can process the optical shape sensing data and the intravascular imaging data to generate three-dimensional models and images of the vessel immediately before and after the stent is implanted in the vessel and make an exact comparison of the before and after images to ensure that the stent is properly implanted and will produce or is producing the desired and effective results. The exact comparison can be based on a derived diameter associated with the location of the stent placement in the vessel, which is based on the generated pre- and post- three-dimensional models.

This application provides a stent placement device for cardiac surgery, comprising a cannula with an inlet end and an outlet end; the cannula is divided into 2-3 cannula branches at the inlet end; the cannula accommodates 2-3 stent delivery catheters; one stent delivery catheter is inserted from each cannula branch; all stent delivery catheters exit from the cannula outlet end; each stent delivery catheter has a guidewire lumen and a stent balloon pressure chamber; a guidewire is disposed in the guidewire lumen; a stent implanter is disposed at the tip of the stent delivery catheter, and an ultrasound positioning ball is sequentially disposed at the tip of the stent delivery catheter. This application utilizes a structure consisting of a flexible cannula and multiple stent delivery catheters to conveniently and simultaneously provide precise stent implantation for multiple blood vessels; by incorporating an ultrasound positioning ball with a corner reflector to enhance ultrasound reflection, the implantation and detailed operation of the device can be more easily completed under ultrasound monitoring.

The utility model provides a ureter support, which relates to the technical field of medical instruments and comprises a tube body, a plurality of drainage holes and a cavity channel for flow guide liquid to pass through are arranged on the tube body, a fixing wire is further arranged on the tube body, the fixing wire is arranged along the axial direction of the tube body, the hardness of the fixing wire is higher than that of the tube body, and the tube body can be shaped by the fixing wire. By arranging the fixing wire, under the condition that the flexibility of the pipe is guaranteed, the fixing strength is improved, the comfort degree of a patient is improved, meanwhile, the stent disengagement risk is reduced, pre-shaping can be conducted before the stent is placed in the body of the patient, the stent is made to be more attached to the physiological structure of the patient, friction between the pelvis and the ureter and the stent in the moving process of the patient is reduced, and the patient is protected. And discomfort and inflammation caused by stent implantation are reduced. Compared with a traditional structure, the auxiliary fixing part is additionally arranged at the tail end of the support, the fixing area is increased through the auxiliary fixing part, fixing devices such as adhesive tape and gauze are matched, and the risk of support slipping caused by in-vitro fixing failure is reduced.

The invention provides a non-intravascular stent conveying system with balloon dilatation and a conveying method. The non-intravascular stent conveying system with balloon dilatation comprises an outer tube, an inner tube and an inner tube, the balloon is arranged on the circumferential outer side of the outer tube in a sleeving manner and is configured to expand outwards in the circumferential direction of the outer tube after reaching a target position in the cavity so as to expand the cavity; and the self-expanding stent is collected in one end of the outer tube, and the self-expanding stent is configured to be released and self-expanded when the outer tube is pulled away from the target position so as to support the expanded cavity. According to the non-vascular stent conveying system with the balloon dilatation function, the outer tube is used for carrying the balloon and the self-expansion stent to reach the preset cavity at the same time, the two functions of preset cavity dilatation and self-expansion stent implantation can be completed on one instrument, the time of a stent implantation operation is shortened, and then the risk of the stent implantation operation is reduced.

A stent for insertion into a vessel of a patient includes an inner tube comprising a positive Poisson's ratio (PPR) material and defining a lumen extending along a longitudinal axis of the stent; and an outer tube comprising a negative Poisson's ratio (NPR) foam material and disposed around an entirety of the inner tube, the outer tube extending along the longitudinal axis of the stent. The stent is configured to exhibit an auxetic behavior in response to a deformation of the stent. An outer surface of the second portion is configured to apply a pressure to an inner surface of the vessel when the stent is implanted into the vessel and the deformation is removed.

A delivery device (10), which is used for delivering a stent implant (2) in a catheter (3) and comprises a delivery guidewire (1) and a pushing element (12). The delivery guidewire (1) comprises a stent compression section (11) for loading the stent implant (2), and a proximal portion of the delivery guidewire (1) connected to the proximal end of the stent compression section (11). The pushing element (12) at least comprises a distal-end pushing element (121). The distal-end pushing element (121) is fixed on the stent compression section (11) and is arranged at a position other than the proximal end of the stent compression section (11). When the delivery device (10) delivers the stent implant (2) in the catheter (3) to the distal end, the distal-end pushing element (121) pulls the stent implant (2) distally so as to push same, so that the stent implant (2) is in an axially pulled state. Therefore, such a configuration converts the mode of pressing the stent implant (2) to push same into the mode of pulling the stent implant (2) to push same, thereby avoiding the problem of increased pushing resistance caused by increased radial support force of the stent implant (2) itself during the delivery, and further reducing the risk and difficulty of delivery.

A method for evaluating an intestinal anastomosis stent is provided. By establishing an animal model of mechanical intestinal obstruction, an intestinal anastomosis stent implantation environment is simulated after intestinal tumor surgery in patients. It was observed that in the digestive tract anastomosis after intestinal severance under this intestinal obstruction animal model, the implantation of the anastomosis stent can promote wound healing at the intestinal anastomosis site, and the degree of abdominal adhesion is reduced during the healing process, and the intestinal bursting pressure strength is well restored; at the same time, according to the tissue section analysis of this site, it can be seen that its tissue healing process conforms to the physiological healing law and is better than the healing of the group without stent implantation. Moreover, from the expression of the degree of inflammation, the expression of new blood vessels, and the degree of fibrosis, it can be judged by comparing the stent implantation group and the group without stent implantation whether the stent to be tested has a significant advantage in promoting healing after intestinal anastomosis in this mechanical intestinal obstruction animal model. This provides an intuitive detection method for evaluating new materials for preparing intestinal anastomosis stents.

The present invention is entitled "Thrombectomy and Stent Implantation System". The present invention provides a design capable of both mechanical thrombectomy and stent implantation for the treatment of occlusions in the cerebral vasculature, which provides a three-catheter setup. A first outer catheter has the largest diameter and can serve as a guide catheter, while also serving as a sheath for the other catheters. A second deployment catheter can be configured for aspiration of the occlusion and can include a proximal stepped or recessed segment at the distal tip that can act as a housing for a woven expandable stent. The outer diameter of the stepped segment can be lined with an inflation device having a woven stent disposed on its top. Inside the second deployment catheter is a microcatheter that can deliver a mechanical thrombectomy device to the target site to retrieve the occlusion in the vessel, after which the stent can be expanded and implanted in the vessel.

The present invention provides an occluder and an occluding system, the occluding system comprising the occluder and a stent; the stent is implanted in the true cavity of aortic dissection and has a pore thereon; the occluder comprises an axially connected anchoring portion and an embolization portion, the anchoring portion comprises a first coil assembly, the embolization portion comprises a second coil assembly, the embolization portion is used to pass through the pore on the stent and then extend into the false cavity from the rupture of aortic dissection, the anchoring portion is arranged in the inner cavity of the stent, and the occluder is connected to the stent. The occluding system can avoid dislocation or displacement of the occluder, and also avoid secondary damage to the blood vessel wall, and has a good therapeutic effect.

Provided are a balloon stent installation device and a stent installation method. The balloon stent installation device, which is used to install a self-expandable stent to a lesion site of a blood vessel, includes a balloon dilatation catheter and a stent release tube. The balloon dilatation catheter includes a first through hole with an inlet and an outlet. An expansion part is disposed at a distal end of the balloon dilatation catheter. The self-expandable stent is slidably mounted in the first through hole and located at a distal end of the balloon dilatation catheter. The stent release tube is slidably disposed in the first through hole. A distal end of the stent release tube abuts against the self-expandable stent and includes a second through hole. A micro guidewire is configured to be inserted sequentially through the outlet of the first through hole, the self-expandable stent, and the second through hole.

A system and method for transesophageal echocardiogram-guided implantation of a stent are disclosed. The system includes at least a transesophageal echocardiogram (TEE) system, at least a display and at least a computing device configured to receive a plurality of ultrasound images, generate at least a three-dimensional (3D) cardiac model as a function of the plurality of ultrasound images, receive at least a 3D stent model, determine a view label for each of the plurality of ultrasound images and display the at least a 3D cardiac model and the at least a 3D stent model as a function of the view label.

The utility model discloses a vein double-layer covered stent which comprises a stent body, the stent body is of a tubular structure with a hollow tube wall, the whole stent body is lined with a double-layer covered film matched with an inner cavity of the stent body, a covered film cavity is formed between the double-layer covered film, and the covered film cavity is a cylindrical sealed cavity. The utility model is used for stent implantation after the patient with the pressed or blocked iliac vein is opened or the balloon is expanded, and conforms to the vein blood flow while keeping the iliac vein unobstructed for a long time, so as to relieve the obstruction of the outflow tract and maintain the unobstructed iliac vein for a long time.

This invention discloses a dynamic prediction system for long-term adverse cardiovascular event risk after stent implantation, belonging to the field of personal health risk assessment technology. It includes: a cardiovascular assessment module for determining the target cardiovascular adverse event presentation coefficient based on the target patient's first chest pain rating and real-time heart rate after stent implantation; a cardiac function assessment module for determining the emphasis of cardiac function analysis at each stage based on the target patient's physical examination data after stent implantation; a probability determination module for determining the probability of the first adverse event based on the target cardiovascular adverse event presentation coefficient and the emphasis of each cardiac function analysis; and an indicator determination module for comparing the target patient's first adverse event probability with the second adverse event probability of each monitored patient to obtain the target cardiovascular risk warning indicator for the target patient. This invention can improve the accuracy of long-term risk prediction for adverse cardiovascular events.