18 results about "Vena cava filters" patented technology

The utility model relates to the field of interventional therapy, and discloses a vena cava interventional valve. The vena cava interventional valve comprises a body support, the body support comprises an upper cone part, a barrel part and a lower cone part, and the upper cone part and the lower cone part are arranged at the two ends of the barrel part respectively; the fixing piece is arranged at the joint of the upper cone part and the barrel part; the covering film is arranged on the outer side of the body stent; and the artificial valve leaflet is arranged in the barrel part of the body bracket. The conveying size of an existing inferior vena cava filter is small and is only 6F, and the inferior vena cava filter is improved on the basis of the basic structure of the inferior vena cava filter, so that the inferior vena cava filter has the same small conveying size and fixing efficiency; by means of the fixing piece, positioning can be accurately and easily achieved in the valvular operation, and the pressing difficulty of the surgical operation is reduced; and the valve can be completely recovered before being completely released, so that the safety of the operation is improved.

The present application relates to the technical field of image analysis, and in particular to a kind of inferior vena cava filter implantation puncture target point auxiliary path planning method.Multiple CT images of the inferior vena cava of the patient are obtained, and the region to be distinguished is preliminarily divided based on the shape change of the blood vessel.Then, combined with the shape features and area change of the region to be distinguished, the blood vessel overlap representation evaluation index is determined, and the overlap and non-overlap regions are distinguished.Next, the overlap and non-overlap regions are combined, the shape similarity and overlap representation evaluation index similarity are analyzed, the smooth continuation index is determined, and the matching combination is screened out based on the index and the proportion of blood vessel overlap area.In addition, the gray value difference of blood vessels at different levels in the CT image is also considered, and the non-blood vessel overlap region is evaluated at different levels to more accurately represent the region belonging to the same blood vessel.Finally, according to the hierarchical evaluation result, the navigation path planning of the puncture target point in the region with blood vessel overlap is more accurate, and the planning accuracy is improved.

The invention discloses a recoverable woven filter and a taking-out device and system, relates to the technical field of interventional medical instruments, and aims to solve the problems that an existing vena cava filter depends on a center hook for grabbing, the taking-out difficulty is large, blood vessels are prone to being damaged, and the taking-out failure rate is high. The recoverable woven filter comprises a hooking piece, a protecting piece and a filtering part, the filtering part is woven by nickel-titanium metal wires to form a proximal section, a middle section and a telecentric section, the proximal section and the telecentric section are open grids with gradually-changed pore diameters, and an anchoring structure is arranged on the outer side of the middle section; the intersections of the metal wire weaving are in surface contact friction locking, and can be integrally contracted under axial traction force. The taking-out device comprises a tube base, a sheath tube and a grabbing mechanism, and the grabbing mechanism clamps any part of the filter through an occlusion head and pulls the filter into the sheath tube. The filter is high in softness, can be clamped and taken out at multiple parts, does not need to depend on a specific hooking piece, is low in alignment requirement, remarkably improves the taking-out success rate, and is suitable for vena cava thrombosis filtration and safe recovery.

The utility model relates to a recoverable inferior vena cava filter which comprises a recovery column and a vena cava filter body with an unfolded state and a folded state, a recovery hook is arranged on the recovery column, and the vena cava filter body comprises a plurality of first filter rods and a plurality of second filter rods; the first filter rod comprises a first sub-rod, a second sub-rod and a third sub-rod, the top end of the first sub-rod is connected with the recovery column, the tail end of the first sub-rod is connected with the top ends of the second sub-rod and the third sub-rod respectively, and first positioning hooks are arranged at the tail ends of the second sub-rod and the third sub-rod respectively; the top end of the second filter rod is connected with the recovery column, and the tail end of the second filter rod is provided with a second positioning hook. The problems that a traditional umbrella-shaped filter is low in capture rate, prone to deviation and poor in centering performance are solved, double-layer circumferential point contact is adopted to be fixedly attached to the blood vessel wall, good centering performance is guaranteed, and the problems that a traditional cylindrical supporting rod is large in contact area, intimal hyperplasia is likely to be caused, and the filter is difficult to recycle are solved.

The invention discloses a device for recycling an inferior vena cava filter, and relates to the field of devices for recycling the inferior vena cava filter.The device comprises a large sheath assembly, an expansion mechanism and an inner core assembly, the large sheath assembly is used for protecting the expansion mechanism and the inner core assembly, and the expansion assembly is used for recycling the inferior vena cava filter; the inner core assembly is used for positioning the whole device, the expansion mechanism is located in the large sheath assembly, and the inner core assembly is located in the expansion mechanism. According to the device for recycling the inferior vena cava filter, the flexible bending sleeve can be bent into a J shape through the first adjusting assembly, then the inclined inferior vena cava filter is centralized, recycling work of the inferior vena cava filter is facilitated, and the situation that the filter fails to be recycled due to inclination of the filter is avoided; and the filter can be recycled through the second adjusting assembly and the expansion assembly, so that the filter is more convenient to recycle.

The application discloses a woven type vena cava filter, which comprises a woven filter, and the woven filter is woven by a plurality of metal wires; the woven filter is sequentially formed with a fishing section, an abutting section and an opening section from a distal end to a proximal end; the metal wires of the abutting section are in a three-dimensional spiral shape, the three-dimensional spiral metal wires of the abutting section are overlapped and woven into a flat tubular structure, the abutting section is used for contacting with an inner wall of a blood vessel, so that the woven filter is fixed in the blood vessel; the metal wires of the fishing section are in a three-dimensional spiral shape, and the spiral radius of the three-dimensional spiral metal wires of the fishing section decreases in a distal end direction; the metal wires of the fishing section are formed with mesh holes, the mesh holes can allow blood flow and limit thrombus; the metal wires of the opening section are stranded into a plurality of metal bundles, and the metal bundles of the opening section are formed with openings, and the openings can allow the thrombus to pass. The application has better compliance and abutting property, can reduce damage to the blood vessel wall, prevents the filter from deviating, and has better developing effect.

The vena cava filter comprises a conveying pipe, a pushing pipe, a filter screen and an expander, a cover cap is arranged at the far end of the conveying pipe, an opening is formed in the cover cap, the pushing pipe is movably inserted into the conveying pipe relatively, the expander is movably inserted into the conveying pipe and the filter screen, and the filter screen has a containing state and a working state. When the filter screen is in a storage state, the filter screen is located in the conveying pipe and is folded into a pipe shape, when the filter screen is in a working state, the filter screen is located outside the far end of the conveying pipe and is self-expanded into a funnel shape, the pushing pipe is used for pushing the filter screen to enable the filter screen to extend out of the far end of the conveying pipe, and the cap is pushed by the filter screen to deform, so that the opening is enlarged. And the maximum inner diameter of the enlarged opening does not exceed the inner diameter of the conveying pipe. According to the utility model, the delivery tube, the pushing tube, the filter screen and the dilator are coaxial and integrated, so that the operation is more convenient, and the risk that the far end of the delivery tube shovels the blood vessel wall in the pushing process can be avoided.

A central release device of an inferior vena cava filter comprises a sheathing canal; a neck tube is arranged at the axis position of the filter, and the filter is compressed and contained in the sheath tube; the supporting piece is provided with supporting petals and a connecting part, the supporting petals are made of elastic materials, the supporting petals are arranged around the connecting part, and the connecting part is located at the axis position of the supporting piece; the supporting piece is compressed and contained in the sheath tube and located on the side, facing the opening of the sheath tube, of the filter. And the guide wire is arranged in the sheath tube and penetrates through the neck tube to be connected with the connecting part. After the supporting piece is released, due to the fact that the connecting part of the supporting piece is located at the axis position, the connecting part can be located at the central position of the vein after the supporting valve is opened and abuts against the vein. Therefore, when the filter is released, the neck tube can be located at the corresponding position of the connecting part along the guide wire, and then the neck tube is located at the central position of the vein. Therefore, the thrombus capturing efficiency of the filter can be improved, and the complication risk is reduced.

The application relates to a lower vena cava filter with a cutting structure and belongs to the technical field of medical devices. The lower vena cava filter comprises a recovery column, a recovery structure is arranged on the recovery column, a support mechanism comprises a plurality of support structures connected to the recovery column, the plurality of support structures are arranged at intervals in the circumferential direction of the recovery column, and a cutting structure is arranged on one side of each support structure in the direction of the axis of the recovery column. In the application, the cutting structure is arranged on the inner side of the support structure. In the process of recovering the lower vena cava filter, the cutting structure can cut the proliferative intima, the damage to the inner wall of the vein caused by irregular tearing of the proliferative intima when the lower vena cava filter is pulled is avoided, the incidence of complications of the lower vena cava filter is effectively reduced, and the time window for taking out the lower vena cava filter is prolonged to some extent, thereby prolonging the protection time of the patient.

The application relates to the technical field of medical devices, in particular to a vena cava filter taking-out device which comprises a traction tube, a first traction assembly and a second traction assembly; the first traction assembly comprises a first traction wire, a first guide ring and a first traction ring, one end of the first traction wire is connected to the first traction ring, and the other end of the first traction wire extends to the rear end of the traction tube through the first guide ring; the second traction assembly comprises a second traction wire, a second guide ring and a second traction ring; one end of the second traction wire is connected to the second traction ring, and the other end of the second traction wire extends to the rear end of the traction tube through the second guide ring. When the recovery hook enters the front end of the traction tube, the first traction ring and the second traction ring can be used to clamp the recovery hook at the same time. Therefore, when the traction tube is pulled outward, even if the longitudinal force is not enough, with the movement between the recovery hook and the traction ring, at least one traction ring will hook the recovery hook, so that the efficiency of recovery is ensured.

The application relates to a filter device for inferior vena cava, belonging to the technical field of medical instruments, and solves the problem that an inferior vena cava filter screen may be inclined and cannot be smoothly taken out of a blood vessel during implantation operation in the prior art. The application comprises a front positioning unit, a filter screen unit and a rear positioning unit, the filter screen unit is sleeved on the front positioning unit, and the rear positioning unit is sleeved on the filter screen unit; the front positioning unit and the rear positioning unit are both used for being unfolded first, and the unfolded positioning of the filter screen unit unfolded subsequently. The first positioning point of the front positioning unit and the second positioning point of the rear positioning unit are both on the center line of the front positioning sleeve, after the filter screen assembly is unfolded, the front positioning sleeve can ensure that the center line of the filter screen assembly coincides with the center line of the inferior vena cava blood vessel, the filter screen assembly cannot be inclined in the inferior vena cava blood vessel, and the filter screen assembly can be smoothly taken out of the inferior vena cava blood vessel subsequently.

The invention discloses a method and a device for taking out an inferior vena cava filter, the device for taking out the inferior vena cava filter comprises a recovery sheathing canal and a looped catheter, the looped catheter comprises two catheter cavities which are symmetrically arranged, and the catheter cavities are provided with flexible bendable sections; firstly, the filter taking-out device is conveyed to the position above a filter to be taken out in a venous cavity, and the catheter cavity flexible bendable section is controlled to be bent in the preset direction; the two ends of the catheter cavity flexible bendable section penetrate into a filter screen structure of the filter, and the catheter cavity flexible bendable section is controlled to form an O-shaped closed loop; then entering a guide wire to form a loop, and exiting the loop forming catheter; the filter is separated from the vein cavity wall through cooperation of the looping guide wire and the recovery sheath tube, and the filter is taken out after being collected into the recovery sheath tube. The method and device are easy to operate, safe and reliable, the filter taking-out success rate is remarkably increased, the surgical operation time is shortened, and the method and device are particularly suitable for taking out difficult filters.

The application discloses a filter recovery device based on a double-core forceps-shaped tube and belongs to the field of medical instruments and equipment, which comprises a recovery long sheath catheter, a double-core forceps-shaped tube arranged in the recovery long sheath catheter and a soft guide wire arranged in the double-core forceps-shaped tube, wherein the double-core forceps-shaped tube comprises two soft catheters fixed together in parallel, namely a forceps-shaped tube A and a forceps-shaped tube B, the head portions of the forceps-shaped tube A and the forceps-shaped tube B are separated from each other, at least one of the head portions is bent away from the other, and the end portions of the forceps-shaped tube A and the forceps-shaped tube B are buckled to each other so that the head portions of the double-core forceps-shaped tube become forceps-shaped. The application has novel design and ingenious concept, effectively reduces the difficulty of recovery of a vena cava filter, improves the success rate of recovery, and is suitable for filters in various difficulty levels and various implantation states, and has remarkable effect.

The invention belongs to the technical field of medical instruments, and provides a soluble inferior vena cava filter. The soluble inferior vena cava filter comprises a filtering part and a restraint ring, the filtering part comprises an expansion part and contraction parts, the expansion part is located in the middle of the soluble inferior vena cava filter, and the contraction parts are located at the two ends of the soluble inferior vena cava filter; the filtering part is composed of degradable material wires, and the two ends of the filtering part are restrained in the restraining rings to form the contraction part. The soluble inferior vena cava filter can be completely degraded in vivo and does not need to be taken out through a secondary operation; the expansion part provides enough supporting force and stability, and the contraction part plays a role in filtering thrombus; the staged degradation design is adopted, the restraint ring is degraded firstly, the contraction part is expanded, then the expansion part is gradually degraded, the inferior vena cava cannot be blocked, and the risks of stress fracture and collapse or displacement of the supporting part are reduced; and a proper degradable material is selected, so that the filter has supporting force, stability and thrombus filtering effect.

The application relates to the technical field of medical devices, and discloses a recovery system and a recovery method for a vena cava filter, the recovery system comprising a vena cava filter and a recovery device, the recovery device comprising a guide device, a snare, a recovery sheath and a guide wire; the guide device comprises a connecting rod and a guide fixing claw, a central cavity capable of accommodating the guide wire is arranged in the connecting rod, a recovery groove is formed in the outer side of one end of the connecting rod, the guide fixing claw is arranged at one end of the connecting rod close to the recovery groove, the guide device is connected with the filter rod of the vena cava filter through the guide fixing claw and is used for adjusting the position of the vena cava filter; the recovery sheath can accommodate the snare, the guide device and the vena cava filter; the guide fixing claw of the guide device can pass through the recovery sheath and enter the blood vessel; the snare is used for capturing the filter recovery hook of the vena cava filter and recovering the vena cava filter into the recovery sheath. The position of the vena cava filter in the blood vessel is adjusted through the guide device, and the recovery is further facilitated.

The embodiment of the present specification provides a vena cava filter, comprising: a stent part having a telescopic state, being in contact with a vena cava wall after being unfolded, and being formed with a hollow channel; a filter part being arranged in the hollow channel, one end of the filter part being in a radial structure and being connected with the stent part, the other end of the filter part being in a converging state and being suitable for collecting embolic materials; and the filter part comprising: a degradable structure and a non-degradable coating layer coated on the degradable structure, and the degradable structure being suitable for being degraded after the non-degradable coating layer is removed. By using the above scheme, the transformation process of the vena cava filter can be controlled, and the embolic materials in the vena cava wall can be more effectively treated.

This invention discloses an iliac vein stent assembly capable of filtering thrombi, relating to the field of vascular stent technology, and particularly to an iliac vein stent assembly capable of filtering thrombi. It comprises an iliac vein stent and a vena cava filter. The iliac vein stent is bifurcated; the long and short branches of the stent are released into the left and right iliac veins respectively, and are fixed to the main stent with barbs. The main stent is released at the common iliac vein at the confluence of the left and right iliac veins. The fixing ring serves as the anchor point for the vena cava filter, connecting the vena cava filter and the iliac vein stent together to form a stent assembly. The vena cava filter's claws and support frame are made of the same shape-memory metal tube, and the connecting rod is a nickel-titanium tube body. The claws rotate within the fixing ring, and the connecting rod moves back and forth within the fixing ring. This invention comprehensively solves iliac vein compression syndrome, effectively prevents stent displacement during postoperative recovery, and prevents postoperative thrombus flow to the pulmonary artery, making it suitable for patients with contraindications to thrombolysis.

This invention relates to the field of implantable medical device technology, and in particular to an intracavitary implant structure, especially a vena cava filter. Specifically, it discloses an intracavitary implant structure and a vena cava filter having the structure, including a central part with a central axis and a peripheral functional part consisting of several rods extending outward from the central part. By improving the arrangement, structure and shape of the rods constituting the functional part, the implant has better neutralization and other effects.