21 results about "Arterial stents" patented technology

The utility model provides a carotid artery stenosis stent, and belongs to the technical field of carotid artery stents. Comprising a plurality of sub-supporting frames which are sequentially connected, each sub-supporting frame is in a truncated cone shape with a large-diameter end and a small-diameter end, the large-diameter ends of all the sub-supporting frames face the same direction, and in any two adjacent sub-supporting frames, the diameter of the large-diameter end of the sub-supporting frame close to the far end is not larger than that of the small-diameter end of the sub-supporting frame close to the near end; the technical problems that an existing carotid artery stenosis stent is prone to damaging blood vessels and cannot be fully attached to or support the blood vessels are solved.

The invention belongs to the technical field of artery stents, and particularly relates to a degradable coronary artery stent and a preparation method thereof. Wherein the degradable coronary stent is of a tubular network structure prepared by a main frame and connecting rib components, the main frame is of an open network structure, anchoring points are arranged at nodes, and the connecting rib components are detachably connected and lock the main frame through the anchoring points to form an integral rigid structure, so that the elastic retraction force after a blood vessel is implanted is effectively resisted; the connecting rib component is gradually degraded and loses the locking capacity along with the promotion of vascular repair, the loaded rapamycin is synchronously released, smooth muscle cells with active proliferation are accurately inhibited, the risk of restenosis in the stent is reduced, meanwhile, the activity of the main framework is recovered, the main framework slightly deforms along with vascular pulsation, and vascular intimal injury and inflammatory response are reduced.

The invention provides a vertebral artery stent, which relates to the technical field of medical instruments, and comprises a stent main body used for being placed in a vertebral artery; the stent flaring is arranged at one end of the stent main body and is suitable for being attached to a vertebral artery opening in a self-expanding manner; the self-expandable stent flaring is arranged, the stent flaring can be matched with the vertebral artery opening blood vessel shape and attached to the vertebral artery opening, a doctor does not need to excessively expand through a balloon and other structures, the stent service life is prolonged, the problems that the stent opening position is excessively extruded and plaques fall off are solved, and the operation efficiency is improved; meanwhile, the good wall attaching effect of the stent flaring and the vertebral artery opening is guaranteed.

The invention provides a vertebral artery stent. The vertebral artery stent is characterized by comprising a stent body, a blocking balloon assembly and a supporting balloon assembly; wherein the plugging balloon assembly comprises a plugging balloon and a plugging catheter which are connected with each other; a balloon body of the plugging balloon is arranged at the front end of the stent body, and the plugging catheter penetrates through the whole stent body and extends out of the rear end of the stent body; the supporting balloon assembly comprises a supporting balloon and a supporting catheter which are connected with each other; a balloon body of the supporting balloon is arranged in the stent body, and the supporting catheter extends out of the rear end of the stent body. The stent can effectively solve the problem of plaque flow guide in the stent implantation process.

The present invention discloses a product having a topological microstructure that can accelerate endothelial cell migration, including a substrate and a topological microstructure on the substrate surface. The topological microstructure is a continuous groove array composed of a number of continuous grooves arranged in a regular pattern. A single continuous groove is a continuous teardrop-shaped structure, and the cross-section of the teardrop-shaped structure is composed of a semicircle and a trapezoid. The radius r of the semicircle is selected from 2 to 50 μm, the lower base of the trapezoid is 2r, the height l of the trapezoid is selected from 10 to 100 μm, and the upper base a of the trapezoid is selected from 1 to 80 μm. The topological microstructure disclosed in the present invention is a continuous groove array in a continuous teardrop-shaped structure. Its special structure can improve the orientation of endothelial cells and accelerate the efficiency of endothelial cell migration. The structure is simple to prepare, has a controllable process, and has stable properties. It can be applied to medical devices such as occluders, arterial stent grafts, and balloons.

The invention relates to the technical field of intravascular stents, and discloses an aortic stent and an aortic stent split conveying device.The aortic stent comprises a first stent section, a second stent section and a connecting piece, one end of the first stent section is arranged in one end of the second stent section in a sleeved mode, and the connecting piece is connected between the first stent section and the second stent section; the traction device is used for pulling the second stent section which expands before the first stent section, and when the first stent section and the second stent section are both in the expansion state, the part, located in the second stent section, of the first stent section abuts against the second stent section. The split conveying device comprises an inner core and an outer sheath, the outer sheath comprises a first sheath section and a second sheath section which are movably arranged outside the inner core in a sleeving mode, and the second support section and the first support section are sequentially released by moving the first sheath section and the second sheath section back to back. The release stability and accuracy are better, and the risk of injury to the blood vessel wall is smaller.

The utility model provides an arterial stent conveying device, and belongs to the field of medical instruments. The conveying device comprises an operating handle, a plurality of first indicating marks and a plurality of second indicating marks, wherein the operating handle is uniformly surrounded by a circle; a plurality of second indication marks are uniformly embedded in the tube wall, far away from the tail end of the operating handle, of the outer sheath in a circle, and the second indication marks are matched and correspond to the first indication marks; a fixed handle; and an inner core. According to the conveying device, the positioning accuracy can be improved when an arterial stent is conveyed, positioned and released, the relative position of the stent and a branch blood vessel inlet can be visually recognized and aligned through the corresponding first indication mark and the second indication mark, and the accuracy of an in-vitro fenestration operation is greatly improved. Moreover, the first indication mark and the second indication mark which correspond to each other provide a simple and intuitive mode for a doctor to determine the windowing position, so that the operation process is simplified, and the dependence on advanced imaging equipment is reduced.

The application relates to an aortic stent and a manufacturing method thereof. The manufacturing method of the aortic stent comprises the following steps: providing a proximal stent section for being implanted into a descending aorta, a distal stent section for being implanted into an ascending aorta, and an arch stent section for being implanted into an aortic arch; providing a foldable covering film; covering the covering film on the proximal stent section and the distal stent section; providing a keel line with a pre-bent shape; and penetrating the keel line through the proximal stent section, the arch stent section and the distal stent section; wherein the proximal stent section, the arch stent section and the distal stent section jointly define a supporting cavity, the covering film is foldable, and the keel line has the pre-bent shape. The whole stent can be bent along the bending direction of the keel line, so that the elastic straightening force of the aortic stent itself can be reduced, the flexibility of the aortic stent is improved, and the complications caused by poor adhesion are reduced.

The present invention relates to a staged balloon-expandable vertebral artery stent system and method with precise positioning, belonging to the technical field of balloon stent positioning in vertebral artery surgery. The present invention is provided with a special-shaped balloon. On the one hand, through the differential design of the size structures of the proximal balloon and the distal balloon, physical limit and positioning are achieved. It can not only ensure that the position of the special-shaped balloon can accurately reach the designated position at the connection of the stenosis site and the subclavian artery and perform automatic calibration when inserted, but also effectively avoid the influence of the amplitude of the special-shaped balloon and the stent when the catheter is withdrawn. On the other hand, by controlling the speed and magnitude of the advancing air pressure, the sequential deformation processes of the proximal balloon and the distal balloon are realized to ensure the fixation of the stent after sufficient positioning. In addition, the present invention is also provided with a radiopaque marker to assist in positioning, improving the precision of balloon stent positioning during surgery, avoiding the amplitude phenomenon of catheter withdrawal, and the negative impacts brought by damaging or cutting plaques, and having high promotion value.

The invention relates to a self-expandable stent, especially a pulmonary stent, with a proximal section, a middle section and a distal section arranged at a longitudinal axis of the stent, the stent having a dry valve made of bovine pericardium arranged at the middle section thereof, a skirt surrounding the dry valve at least at the middle section and made of one of bovine pericardium and polyester, wherein the stent further comprises eyelets arranged at a distal end at the distal section and / or a proximal end at the proximal section for fixing the stent at an artery, and wherein the stent comprises a frame composed of a plurality of arms forming the proximal, the middle and the distal section with the sections being interconnected, and the stent comprising a fixture area at the middle section of the frame with the arms being arranged in parallel to each other at the fixture area and the middle section comprising one or more fixture openings at said fixture area for fixing the valve at the frame. The invention further relates to A delivery device for delivering a self-expandable stent according to claims 1 to 14, the delivery device comprising a flush port, a main body part for holding, inflating and / or releasing the stent, and an actuation mechanism for moving the stent to a delivery site, and / or wherein the actuation mechanism has a torque control and can rotate the stent about an axis of the main body, and / or the delivery device having a knob or the like at the actuation mechanism, with the knob in particular being able to be rotated about an axis of rotation of the actuation mechanism.

The invention provides a carotid artery stent which comprises a plurality of supporting rings arranged in parallel in the axial direction, each supporting ring extends in the circumferential direction and comprises a plurality of supporting units, the multiple supporting units are connected end to end to form a ring-shaped structure, and a connecting assembly is arranged between every two adjacent supporting rings. The supporting units in the supporting rings are connected with the supporting units in the adjacent supporting rings in the axial direction through the connecting assemblies, and the supporting units can be contained in the connecting assemblies. According to the embodiment of the invention, the problems that the stent is difficult to compress and load, and the stent is difficult to release or instantly released and rushed out due to overlarge pushing resistance in the release process are solved, the radial force and flexibility of the stent are considered, and meanwhile, the easy loading and releasing capability is achieved.

A minimally invasive circulatory support platform that utilizes an aortic stent pump or pumps. The platform uses a low profile catheter-based techniques and provides temporary and chronic circulatory support depending on the needs of the patient. Further described is a wirelessly powered circulatory assist pump for providing chronic circulatory support for heart failure patients. The platform and system are relatively easy to place, have higher flow rates than existing systems, and provide improvements in the patient's renal function.

Disclosed is an Everolimus-eluting cobalt chromium coronary stent comprising a biodegradable polymer-based coating disposed on the abluminal surface thereof The coating comprises a mixture of Everolimus and one or more polymers. The polymers are biodegradable ensuring controlled, monodirectional release of Everolimus over time.

The invention discloses a vertebral artery stent and a stent conveying system.The vertebral artery stent comprises a net-tube-shaped stent formed by weaving first weaving wires and second weaving wires according to the quantity ratio of 0.25-4: 1, and the degradation speed of the first weaving wires is larger than that of the second weaving wires; therefore, the mesh size of the mesh tubular stent can be increased along with the degradation of the first weaving wires. While the radial supporting force is ensured, the requirement that the stent is not broken during torsion is met, and meanwhile, the potential safety hazard of a patient caused by thrombus of a metal material can be effectively reduced.

The application provides an aortic stent releasing device for a vascular endovascular intervention robot, which comprises a driving mechanism, a control mechanism and an aortic stent, wherein the aortic stent comprises a stent base and a releasing handle; the stent base has a mounting end and a driving end; a self-expanding stent is sleeved on the mounting end, and a tightening sleeve is sleeved outside the self-expanding stent; the releasing handle is sleeved on the first position of the driving end; the driving mechanism can drive the releasing handle to move towards the second position of the driving end, so that the tightening sleeve is separated from the self-expanding stent, the self-expanding stent is self-expanded, and the mounting end is separated from the self-expanding stent when the stent base moves away from the self-expanding stent; and the control mechanism is signal-connected with the driving mechanism. The aortic stent releasing device uses a power device to replace human hands to complete stent releasing, reduces the operation risk caused by human factors, is simple to operate, stable and reliable, and has high practicability.

The application discloses a recyclable intracranial artery stent system and belongs to the technical field of medical auxiliary instruments. The recyclable intracranial artery stent system comprises a stent and a recycling device. The stent comprises a stent body and a recyclable joint arranged at the proximal end of the stent body. The recycling device comprises a recycling catheter, a push rod and a recycling cage. The push rod is arranged inside the recycling catheter and can slide in the recycling catheter. The recycling cage is connected to the distal end of the push rod and can grasp the joint for recycling. The recyclable intracranial artery stent system can relieve intracranial artery stenosis in a short period, repair the vascular lumen structure, and take out the stent from the body after the intracranial artery lumen structure is repaired and stabilized, thereby avoiding long-term retention of the stent and effectively reducing the loss of the effective lumen of the intracranial artery. The stent can be recycled and replaced according to the recovery of the blood vessel and the stent fitting degree, the treatment scheme can be adjusted in the subsequent period, the problem of in-stent restenosis is solved, and the treatment effect of patients with intracranial artery stenosis is ensured.

The utility model provides an in-vivo bypass device for an aortic stent arch windowing, and belongs to the technical field of medical instruments. The in-vivo bypass device for the aortic stent arch fenestration comprises a sheath seat and a sheath tube, the lower end of the sheath base is communicated with a sheath body, and the side wall of the sheath base is communicated with a flushing pipe; the sheath tube is connected with the sheath body through a connecting part, a first inclined hole is formed in the upper end of the sheath tube, a bent tip is arranged at the lower end of the sheath tube, a bottom hole is formed in the bent tip, a first side hole is formed in the side wall of the lower end of the sheath tube, and a second side hole is formed in the side wall of the upper section of the sheath tube; compared with in-vitro bypass adopted in the prior art, blood supply from the femoral artery is not needed, the problem that a bypass pipeline is long is solved, the operation effect is improved, the burden of medical care is relieved, blood in-vivo bypass is formed to supply blood to the brain, an operator has sufficient time to conduct in-vivo stent in-situ windowing, safety is greatly improved, and convenience and safety are provided for the operation.

The invention discloses an air bag adjusting type artery flow limiter, which belongs to the technical field of medical instruments and comprises a flow limiter and a flow limiting implanter. The flow limiter comprises an arterial stent and a flow limiting component; flow limiting control over a blood flow channel can be achieved through the double-layer air bag structure composed of the outer-layer flow limiting part and the inner-layer flow limiting part, the flow limiting implanter is filled with gas to expand the arterial stent of the net-shaped cylinder structure, the whole arterial stent expands outwards, and therefore the supporting size of the arterial stent is increased; after filling liquid is injected into the flow limiting component to enable the whole flow limiting component to be filled and expanded, a channel for blood circulation in the middle of the arterial stent can be narrowed, the blood flow is reduced by narrowing the blood flow channel, and the purposes of reducing the pressure in an arterial blood vessel and reducing the risk conditions of vascular rupture, bleeding and the like are achieved.

The application discloses a kind of aortic stent plane automatic positioning and related index measurement method. Obtain postoperative patient three-dimensional medical image data and carry out standardization processing;Identify and segment aortic stent and its related anatomical structure, extract stent three-dimensional point set;Determine horizontal reference plane and longitudinal reference plane based on point cloud spatial distribution, and position stent bottom / top plane accordingly;Combine coronary artery opening position to construct coronary plane, generate parallel section between stent bottom plane and coronary reference plane and determine Waldeyer's sinus plane;The intersection of the plane and image data obtains two-dimensional section, calculates the area, perimeter and other geometric indexes of stent and aortic section and outputs result.The method realizes postoperative key plane automatic positioning and quantitative measurement, improves evaluation efficiency and consistency.

The renal artery stent imbedding catheter comprises an outer catheter and an inner catheter, the inner catheter is nested in the outer catheter, the outer catheter comprises an outer catheter body and an outer catheter bending part which are integrally formed, the inner catheter comprises an inner catheter body and an inner catheter bending part which are integrally formed, and an opening of the outer catheter bending part and an opening of the inner catheter bending part have the same angle. The inner catheter is nested in the outer catheter, the outer catheter and the inner catheter are both provided with the bent portions, the angle can adapt to the angulation relation between renal arteries and aorta abdominalis of most patients, and after the inner catheter is matched with a guide wire to be selected into a target blood vessel position, the outer catheter can be used as a support. After the outer catheter reaches the target position, the inner catheter is withdrawn, and a channel of the outer catheter is used as a sacculus and stent conveying channel, so that damage to the abdominal aorta ratio and the renal artery in the sacculus and stent conveying process can be reduced, the occurrence rate of potential complications is reduced, and the technical success rate is increased.