CN213641088U - Intravascular thrombus capture device - Google Patents

Abstract

The utility model provides an intravascular thrombus capture device, includes and gets embolus system and conveying system to and guide sheath pipe, get the embolus system and include one can be from the expanded support of getting the embolus, conveying system includes a push-and-pull seal wire, the push-and-pull seal wire with get the embolus system and be connected, guide sheath pipe can with get the compressed folding and accomodate including of embolus system, its characterized in that: the proximal part of the embolectomy support is a tubular or cage-shaped structure formed by connecting a plurality of unit grids, and the distal part of the embolectomy support is a pocket-shaped or bag-shaped structure formed by connecting a plurality of unit grids. The utility model has the advantages of the thrombus is caught the rate height, and withdraws the in-process thrombus and be difficult to drop, and conveying system compliance type is good, gets to tie the in-process and injure little to the blood vessel.

Description

Intravascular thrombus capture device

The technical field is as follows:

the utility model relates to a medical instrument of interventional therapy in the field of medical instruments, in particular to an intravascular thrombus catcher.

Background art:

acute cerebral thrombosis is mainly caused by cerebrovascular thrombosis, and is the most common lethal and disabling disease of the central nervous system. Cerebral thrombosis has the characteristics of high morbidity, high disability rate, high mortality rate and high recurrence rate. According to a statistical data in Beijing, the incidence of acute cerebral thrombosis in recent years in Beijing is on the decline trend, but the incidence of acute cerebral thrombosis is on the rise, namely the proportion of acute cerebral thrombosis in cerebral apoplexy is reduced from 42% to 16%, and the proportion of acute cerebral thrombosis is increased from 55.8% to 81.6%, so that cerebral thrombosis is the first disease of brain.

The recanalization of blood vessels is the key to the treatment of acute ischemic stroke. At present, the treatment methods for treating intracranial thrombosis mainly comprise two main types, namely a drug thrombolysis mode and a mode of combining mechanical thrombolysis and drug thrombolysis. The drug thrombolysis can dissolve thrombus by intravenous injection of rt-PA (tissue plasminogen activator) or urokinase, and can also be used for intra-arterial contact thrombolysis, anti-platelet aggregation, anticoagulant drug therapy and the like. Although thrombolytic therapy has been shown to improve The prognosis of The nervous system well, drug thrombolysis is still faced with several urgent problems, firstly The short thrombolysis time window, which is considered by The National Institute of Neurological diseases and Stroke Institute (The National Institute of Neurological Disorders and Stroke rt-PA Stroke Group, NINDS) that venous thrombolysis should be performed within 3 hours of onset and arterial thrombolysis time window within 6 hours, and such a short thrombolysis time window that only 4.5-6.3% of patients can receive thrombolytic therapy, secondly The long vascular recanalization time of drug thrombolysis, which may be one of The important factors influencing clinical prognosis, whether venous or arterial thrombolysis, requires at least 1-2 hours, and thirdly thrombolysis therapy is only suitable for small-sized thrombi, the treatment effect on the large-volume thrombus is not ideal; and some patients are not suitable for thrombolytic therapy.

In order to solve the above-mentioned problem of drug thrombolysis, mechanical removal of thrombus has become a focus of research in recent years. The mechanical embolectomy comprises the following steps: sucking thrombus, taking thrombus by a catcher, and crushing thrombus by laser. The effect of sucking thrombus is better when small emboli are taken, but when the emboli are larger, the emboli at the far end can easily escape, the process is troublesome, and the blood vessel is easily injured; the existing method for catching thrombus by the catcher is simple to operate, has little harm to blood vessels, but often cannot catch thrombus, often needs to take thrombus for many times, or needs to simultaneously suck by using a guide catheter during catching, otherwise small fragments falling off from the thrombus can escape and block the blood vessels at the far end; the method has the disadvantages of difficult operation, ineffective laser energy when the laser energy is too low, damage to blood vessels when the laser energy is too high, and various complications easily caused.

Chinese utility model patent cn103417258.b discloses an intracranial blood vessel thrombectomy device, and the device is including thrombectomy ware, guide seal wire, push-and-pull seal wire and outer sheath pipe, and thrombectomy ware links to each other with the push-and-pull seal wire, and the push-and-pull seal wire that installs and thrombectomy ware are pressed and are held in the outer sheath pipe, and at the expansion position, thrombectomy ware is released the outer sheath pipe, and thrombectomy ware is provided with the interior protruding portion of a certain amount on its inner wall.

The chinese utility model patent application cn104000635.a discloses a get and tie device, gets and tie the ware and be network structure and inject the lumen, and can withdraw and switch between position and the expansion position, gets to be equipped with the indent of a plurality of three-dimensional profiles that stretch into the official cavity on the network structure of tie the ware and do, and the both ends of indent pole are fixed in network structure.

Although the operation of the thrombus catcher with the reticular tubular structure is simple, the thrombus is hung by the support grids, and the thrombus is positioned between the periphery of the support and the inner wall of the blood vessel, even if the inner bulge is added or the inner concave rod is connected, the thrombus which can be cut up in the support unfolding process cannot be avoided, formed fragments are likely to fall off in the withdrawing process of the thrombus pulling device, the thrombus taking effect is not reliable, and at present, doctors often need to use a balloon guide catheter in a matched manner to overcome the problem, and the blood flow is blocked by the balloon to prevent the fallen thrombus fragments from being flushed to the far-end blood vessel by the blood flow; the thrombus remover of the reticular lumen has great damage to the inner wall of the blood vessel if the radial force of the stent is adjusted improperly because of the adherence of the thrombus remover to the blood vessel.

In the utility model of patent number ZL200620164685.4, the utility model discloses a thrombus extractor, which comprises an umbrella with two long and one short three-claws with elastic memory function, and a thrombus extraction device with a circular structure formed by the peripheral attached net, wherein the three-claws are closed by pulling the push-pull rod outwards to fold the thrombus and fold the thrombus into the outer sleeve, so as to extract the thrombus.

US2009/0240238.A1 discloses an embolectomy device having a self-expandable snare affixed to the end of an elongated shaft and a collapsible bag of flexible non-porous material attached thereto, which is passed through the elongated shaft to place the device in an embolization position along a body passageway, and which is expanded to entrap thrombus therein.

Although the basket-shaped thrombus remover can prevent thrombus fragments from escaping to a certain extent, the basket-shaped thrombus remover has the obvious defect that the basket-shaped thrombus remover is often too large in volume and cannot be used in cerebral arteries such as M1 and M2 sections of middle cerebral arteries with thin vessel diameters.

Chinese utility model patent application cn201110222609.x and chinese utility model patent cn201120281795.x disclose a thrombus suction catheter, and it includes the suction tube, the suction tube includes the tube socket, tube socket connecting tube, mobilizable cover is equipped with the sleeve pipe on the outer wall of suction tube, the sleeve pipe includes Y type connector, double lumen pipe and sacculus, the double lumen pipe is connected to Y type connector, and the sacculus sets up on the distal end outer wall of double lumen pipe, can draw into the interference wire in the suction tube, the distal end of interference wire can stretch out outside the distal end of suction tube. The thrombus taking system can quickly remove thrombus scattered in a wide area of a blood vessel and treat embolism of peripheral capillary of a coronary artery, and when the thrombus with large volume and high thickness is encountered, the thrombus can be scattered by using the interference metal wire and then sucked.

Another thrombus aspiration catheter is disclosed in US2010/0049147a 1. U.S. patent application 2007/0161963A1 also discloses a thrombectomy aspiration catheter system.

The suction embolectomy system has good effect when small emboli are removed, but when large emboli are removed, the suction tube needs to be repeatedly smashed and then sucked to prevent blockage, the process is troublesome, and blood vessels are easily injured.

As is apparent from the above discussion, the embolectomy devices disclosed in the above patent documents and the conventional embolectomy techniques all have one or more drawbacks. Therefore, further improvements to the prior art are needed and it is desirable to design a better vascular embolectomy device.

The utility model has the following contents:

in order to solve the technical problem, the utility model aims at providing an intravascular thrombus capture device, which has the following characteristics: firstly, the thrombus capture device with the mesh tubular structure has the characteristics of simple operation and small damage to blood vessels, the structure of the thrombus capture device is optimized, and the thrombus capture rate of the thrombus capture device is improved. The thrombus catcher needs to have higher stability on caught thrombus, and broken thrombus is not easy to fall off during withdrawal; secondly, the radial supporting force of the thrombus catcher needs to be moderate, so that the injury to the vessel wall is reduced as much as possible; thirdly, the effective working length of the thrombus taking support which can be contacted with thrombus of the thrombus catcher with the net-shaped tubular structure is as long as possible, and the ineffective transition part is as short as possible, so as to ensure that the thrombus taking support has smaller total length, thereby reducing the risk of the thrombus taking support damaging blood vessels; fourthly, the conveying system has good flexibility and can be conveyed to a thin distal blood vessel in the intracranial; fifthly, the thrombus capture device has certain developing performance, and ensures that a doctor can clearly identify and judge the state of the thrombus extraction system under the DSA (digital subtraction angiography) technology.

The utility model discloses a realize through following technical scheme:

the intravascular thrombus catcher comprises a thrombus taking system and a conveying system, and a guiding sheath tube, wherein the thrombus taking system comprises a thrombus taking support capable of self-expanding, the conveying system comprises a push-pull guide wire, the push-pull guide wire is connected with the thrombus taking system, and the guiding sheath tube can compress, fold and store the thrombus taking system, and is characterized in that: the proximal part of the embolectomy support is a tubular or cage-shaped structure formed by connecting a plurality of unit grids, and the distal part of the embolectomy support is a pocket-shaped or bag-shaped structure formed by connecting a plurality of unit grids.

In the process of releasing the thrombus taking system in a blood vessel, the tubular or cage-shaped structure part at the near end of the thrombus taking support is released at the position of a target thrombus, the pocket-shaped or bag-shaped structure part at the far end of the thrombus taking support is released at the far end of the target thrombus, the unit grids on the thrombus taking support are cut into the thrombus to hang the whole target thrombus by the self-expansion action of the tubular or cage-shaped structure part at the near end of the thrombus taking support, meanwhile, the pocket-shaped or bag-shaped structure part at the far end of the thrombus taking support is also self-expanded and opened to form a far-end protection net, and then, in the process of withdrawing the thrombus taking system with the thrombus to the outside, when the thrombus is cut by the unit grids and escapes from the near part of the thrombus taking support, the broken thrombus is blocked by the pocket-shaped or bag-shaped structure part at the far end of the thrombus taking support and is stored in the thrombus taking support. The effectual thrombus catcher that has solved traditional netted tubular structure of this structure only relies on support net itself to hang the thrombus, breaks the drawback that the thrombus that drops can flee from along support periphery to the distal end.

The terms "distal" and "proximal" in the context of this utility model should be understood as looking from the direction of the attending physician. The distal end is thus the side facing away from the attending physician, whereas the proximal end denotes the side facing towards the attending physician. If the phrase "axial" is used in this document, it is understood to mean the direction in which the device of the invention is advanced, i.e. the longitudinal axis of the device also coincides with the longitudinal axis of the vessel along which the device is advanced. The effective length of the thrombectomy support refers to: the thrombus taking support has a part for catching thrombus and preventing broken thrombus from escaping in the thrombus taking process. The invalid length refers to: the thrombus taking bracket plays a role in transition of connection and plays a part which does not play a direct role in catching thrombus.

The technical scheme is further explained as follows: the net-bag-shaped or bag-shaped structure at the far end of the embolectomy support is characterized in that the near end of the embolectomy support is a large opening area formed by mutually connecting large unit grids, and the far end of the embolectomy support is a closed opening area formed by mutually connecting small unit grids and intersecting the small unit grids at the far end of the small unit grids. The large opening area at the near end can enable thrombus to easily fall into a pocket-shaped or bag-shaped structure, and the small unit grids at the far end are adopted and are converged and closed at the far end to form a pocket shape so as to block thrombus which falls into the stent.

The technical scheme is further explained as follows: the closed closing area of the tuck net-shaped or bag-shaped structure at the far end of the embolectomy support can be shaped into a hemisphere shape. The hemispherical distal end can provide better support for the distal structure, and the hemispherical structure is not easily changed by tortuous blood vessels, so that the structure has better vessel compliance and vessel adherence.

The technical scheme is further explained as follows: the proximal end of the embolectomy support is of a tubular or cage-shaped structure, and proximal end unit grids of the embolectomy support are connected with each other and are intersected at the nearest end to form a transitional closing-up area. The nearest ends of the bracket are intersected to form a closing-up area which is an invalid transition part between the connecting point position of the thrombus taking bracket and the push-pull guide wire and the tubular effective length of the thrombus taking bracket, and the structure can ensure that the invalid length playing the transition role is as short as possible.

The technical scheme is further explained as follows: the embolectomy stent is a metal stent which is manufactured by laser engraving of a shape memory alloy tube with superelasticity effect and post-shaping treatment. The metal stent made of the shape memory alloy has enough radial supporting force, can ensure that the metal stent has good adherence, and the shape memory alloy has the characteristic of super elasticity, so that the thrombus taking stent can generate great deformation after receiving external circumferential constraint force, and the thrombus taking stent can still completely recover to the shape after the constraint force is removed. This feature allows the outer diameter of the thrombectomy stent to be compressed to fit within a microcatheter that functions as a delivery instrument.

The technical scheme is further explained as follows: the embolectomy system comprises an X-ray opaque developing ring which is arranged at the connecting position of the embolectomy bracket and the push-pull guide wire. The clinician can monitor the radiopaque marker ring by a angiographic device such as DSA (digital subtraction angiography) to learn the proximal most position of the endovascular stent.

The technical scheme is further explained as follows: the embolectomy system includes a protective tip in the form of an X-ray opaque coil at the distal-most position of the embolectomy support. Clinician accessible blood vessel image science equipment, for example DSA (digital subtraction angiography) monitors the protection head end of opaque X ray, and then knows the most distal position of taking the thrombus support in the blood vessel, and the soft spring ring form is adopted to the protection head end simultaneously, can avoid when the apparatus goes out little pipe, because of the harm that the blood vessel caused is directly pushed up on the vascular wall to the support most distal end of getting that the maloperation leads to.

The technical scheme is further explained as follows: the embolectomy system includes an X-ray opaque filament wrapped around a portion of the rods of the cellular lattice of the embolectomy stent. When monitoring the X-ray opaque filaments by an angiographic apparatus such as DSA (digital subtraction angiography), the clinician can know the complete opening of the stent and the compressed state of the thrombus by observing the position of the filaments, and then judge the capture condition of the thrombus by the stent.

The technical scheme is further explained as follows: the push-pull guide wire is coated with a lubricating coating which is a PTFE coating or a hydrophilic coating. The lubricating coating reduces the resistance of the instrument in the pushing and pulling process and increases the operation performance of the instrument.

The technical scheme is further explained as follows: the guiding sheath is made of polymer material polytetrafluoroethylene. The guide sheath can be retracted into the guide sheath, and the inner diameter of the guide sheath can be equal to that of the micro-catheter, so that the whole device can be conveniently sent into the micro-catheter; the polytetrafluoroethylene material has a low coefficient of friction, which reduces the resistance of the instrument to advancement into the microcatheter.

The technical scheme is further explained as follows: the push-pull guide wire adopts a design of gradually changing diameters, the diameter of the far end is small, and the diameter of the near end is large. The small diameter of the far end of the push-pull guide wire ensures that the far end of the push-pull guide wire is soft enough and has smaller curvature radius, so that the push-pull guide wire can better adapt to tortuous vessels at the far end of a brain, and the thick diameter of the near end ensures that the push-pull guide wire has certain hardness to the far end, so that the push-pull guide wire can reliably support the thrombus removal system when the thrombus removal system is pushed in a microcatheter.

The technical scheme is further explained as follows: the delivery system includes a support spring coil wrapped around a portion of the length of the distal thin diameter push-pull guidewire. The support spring ring plays a role in strengthening the support strength of the push-pull guide wire with the thin diameter at the far end, so that the efficiency of transmitting the near-end push force to the far-end bolt taking system by the push-pull guide wire is improved, and meanwhile, the support spring ring can adopt alloy containing platinum, is not transparent to X rays, and can ensure that the push-pull guide wire also has developing capability.

Compared with the prior art, the utility model has the advantages of it is following:

firstly, keep its netted tubular structure's thrombus capture device easy operation to and also less characteristics to the injury of blood vessel, make thrombus capture device have higher stability to the capture of thrombus, and the thrombus of breaking up when withdrawing is difficult for droing.

Secondly, the radial supporting force of the thrombus catcher is moderate, so that the injury to the vessel wall is reduced as much as possible.

And thirdly, the effective working length of the thrombus taking support is long, the ineffective length of the transition action is short, and the thrombus taking support is ensured to have a smaller total length, so that the risk of the thrombus taking support to damage blood vessels is reduced.

Fourthly, the utility model discloses a propelling movement seal wire's compliance is good, can carry for example intracranial thinner distal end blood vessel.

Fifthly, the thrombus capture device has certain developing performance, and ensures that a doctor can clearly identify and judge the state of the thrombus extraction system under the DSA (digital subtraction angiography) technology.

Description of the drawings:

examples of the invention will be explained by the following figures:

fig. 1 is a schematic structural view of an example of an intravascular thrombus capture device of the present invention.

FIG. 2 is a three-dimensional structure space diagram of the exemplary embolectomy system shown in FIG. 1.

FIG. 3 is a schematic view of an embodiment of an embolectomy system of another intravascular thrombus capture device of the present invention, wherein the rods of a partial cell lattice of the embolectomy stent are wrapped with X-ray opaque filaments.

FIG. 4 is a schematic view of the example embolectomy system of FIG. 3 as seen by a physician using DSA (digital subtraction angiography) techniques.

FIG. 5 is a schematic view (one) of the procedure for removing a target thrombus in a blood vessel according to the example shown in FIG. 1.

FIG. 6 is a schematic view (two) of the process for removing a target thrombus in a blood vessel according to the example shown in FIG. 1.

FIG. 7 is a schematic view (III) of the procedure for removing a target thrombus in a blood vessel according to the example shown in FIG. 1.

FIG. 8 is a schematic view (IV) of the procedure for removing a target thrombus in a blood vessel according to the example shown in FIG. 1.

FIG. 9 is a schematic view (V) of the procedure for removing a target thrombus in a blood vessel according to the example shown in FIG. 1.

The specific implementation mode is as follows:

in accordance with the principles of the present invention, several examples of thrombus traps are disclosed herein with reference to the above figures. However, the examples disclosed herein are merely examples of the present invention. The details of the detailed disclosure are merely provided as a basis for the claims and as a representative basis for teaching one skilled in the relevant art how to appropriately apply the present disclosure.

Fig. 1 shows an example of an intravascular thrombus catcher of the present invention, which comprises a thrombus extraction system and a delivery system, and a guiding sheath (300), wherein the thrombus extraction system comprises a self-expandable thrombus extraction stent (100), the delivery system comprises a push-pull guide wire (200), the push-pull guide wire (200) is connected with the thrombus extraction system, the proximal part of the thrombus extraction stent (100) is a tubular or cage-shaped structure formed by connecting a plurality of unit meshes, and the distal part of the thrombus extraction stent (100) is a tuck-shaped or bag-shaped structure formed by connecting a plurality of unit meshes. The embolectomy stent (100) is a metal stent which is made by laser engraving a shape memory alloy tube with superelasticity effect and post-shaping treatment, and the alloy material of the metal stent can be nickel-titanium alloy with superelasticity. The embolectomy system comprises an X-ray opaque developing ring (110), the developing ring (110) can be made of platinum-iridium alloy at the connecting position of the embolectomy support (100) and the push-pull guide wire (200), the embolectomy system comprises a protective head end (120) in the form of an X-ray opaque spring ring, and the protective head end (120) can be made of platinum-tungsten alloy at the farthest position of the embolectomy support (100). The push-pull guide wire (200) adopts a design of gradually changing diameter, the diameter of the far end is small, the diameter of the near end is large, the length is 180cm, the push-pull guide wire can be made of super-elastic nickel-iron alloy, good flexibility of the push-pull guide wire is guaranteed, and a lubricating coating is coated on the push-pull guide wire (200) and is a PTFE coating. The lubricating coating reduces the resistance of the instrument in the pushing and pulling process and increases the operation performance of the instrument. The guiding sheath (300) can compress and fold the bolt taking system and is contained in the bolt taking system, the guiding sheath (300) is made of polymer material polytetrafluoroethylene, the inner diameter of the guiding sheath (300) is equal to the inner diameter of the micro-catheter (400), and the length is preferably 65 mm. As shown in fig. 2, the near end of the mesh-bag-shaped or bag-shaped structure of the distal end of the embolectomy stent (100) is a large opening area (101) formed by connecting large unit grids, the far end of the embolectomy stent is a closed closing area (102) formed by connecting small unit grids and intersecting at the farthest end of the small unit grids, the closed closing area (102) of the mesh-bag-shaped or bag-shaped structure of the distal end of the embolectomy stent (100) can be shaped into a hemispherical shape, so that thrombus falling off from the near end of the embolectomy stent (100) can fall into the large opening area (101) and is accommodated and blocked by the closed closing area (102). The proximal end of the embolic stent (100) is tubular or cage-like in structure, with proximal end cells interconnected and meeting at the proximal end to form a transitional constriction region (103).

Fig. 3 shows an example of another intravascular thrombus capture device of the present invention, which differs from the example shown in fig. 1 in that: the embolectomy system of this example includes an X-ray opaque filament (130) wound around a rod of a partial cellular lattice of the embolectomy stent (100). The spiral is wound around the rods of the unit cell according to a trajectory as shown in fig. 3. When a clinician uses a blood vessel imaging device, such as DSA (digital subtraction angiography), the clinician will observe a development image of the fully open embolectomy system on the device screen, the image is shown in FIG. 4, and the clinician can judge the state of the target thrombus (500) being caught by the embolectomy stent (100) by knowing the open and compressed state of the embolectomy stent (100) by generating the position of the X-ray opaque filament (130).

The following is an illustration of the clinician using the example shown in FIG. 1: the clinician angiograms the patient using DSA (digital subtraction angiography) to determine the location of the target thrombus (500) within the blood vessel (600). The distal end of the micro-catheter (400) is conveyed to a position which exceeds the target thrombus (500) by a certain distance by adopting the conventional vascular puncture interventional technology, namely, the position is shown as a position shown in figure 5, then, a proper amount of contrast medium is pushed into the micro-catheter (400), the angiography of the distal end of the thrombus is carried out, the approximate length of the target thrombus (500) is judged, and a thrombus catcher with proper specification is selected. The example of figure 1 is then advanced into a microcatheter (400) and the entire instrument is gradually advanced using the guiding action of the guiding sheath (300). When the X-ray-proof protective head end (120) of the embolectomy system reaches the far end of the microcatheter (400), namely, the position shown in fig. 6, the whole body of the example shown in fig. 1 is kept motionless relative to the human body, the microcatheter (400) is withdrawn towards the near end, the embolectomy stent (100) is unfolded at the position of the target thrombus (500) along with the withdrawal of the microcatheter (400), the unit grids of the tubular or cage-shaped structural part at the near end of the embolectomy stent (100) cut into the target thrombus (500) to hang the whole thrombus, and the net-bag-shaped or bag-shaped structural part at the far end of the embolectomy stent (100) is also self-expanded and opened to form a far-end protective net, and the far end of the microcatheter (400) is withdrawn all the way to the position of the development ring (110) of the embolectomy system, namely, the position shown in fig. 7. After waiting more than 3 minutes, the stent (100) is fully expanded, and when the physician judges that the target thrombus (500) is captured well, the microcatheter (400) and the whole body of the example shown in FIG. 1 are rapidly withdrawn, and the thrombus which is cut and dropped is captured by the pocket-like or bag-like structure part at the distal end of the stent (100), as shown in FIG. 8. When the thrombus taking support (100) catching the target thrombus (500) is withdrawn to the inlet of the guide catheter (700), the inner diameter of the guide catheter (700) is larger than that of the microcatheter (400), but the inner diameter of the guide catheter is smaller than that of the blood vessel (600), thrombus outside the thrombus taking support (100) is liable to be left outside the guide catheter (700), a doctor can select to extract negative pressure to the guide catheter (700), so that the thrombus staying at the tube opening enters the guide catheter (700), and the thrombus at the tube opening can be brought back by utilizing a net-bag-shaped or bag-shaped structure part at the far end of the thrombus taking support (100) in the example, because the thrombus separated from the near end of the thrombus taking support (100) can be caught by the net-bag at the far end of the thrombus taking support (100). Finally, the thrombus removal system withdraws the example apparatus which wraps the target thrombus (500) from the body, and the whole thrombus removal process is completed.

Claims (1)

1. The utility model provides an intravascular thrombus capture device, includes and gets embolus system and conveying system to and guide sheath pipe, get the embolus system and include one can be from the expanded support of getting the embolus, conveying system includes a push-and-pull seal wire, and the push-and-pull seal wire is connected with getting the embolus system, can be with getting including the compressed folding and accomodating of embolus system, its characterized in that: the proximal part of the embolectomy bracket is a tubular or cage-shaped structure formed by connecting a plurality of unit grids, and the distal part of the embolectomy bracket is a pocket-shaped or bag-shaped structure formed by connecting a plurality of unit grids;

the push-pull guide wire adopts a design of gradually changing diameters, the diameter of the far end is small, and the diameter of the near end is large; the delivery system comprises a support spring ring, and the support spring ring is wrapped on the part of the length of the push-pull guide wire with the thin diameter at the far end; the near end of the tuck-in or bag-shaped structure at the far end of the embolectomy bracket is a large opening area formed by mutually connecting large unit grids, and the far end of the tuck-in or bag-shaped structure is a closed opening area formed by mutually connecting small unit grids and intersecting the small unit grids at the farthest end of the tuck-in or bag-shaped structure; the closed closing area of the tuck net-shaped or bag-shaped structure at the far end of the embolectomy support can be shaped into a hemisphere shape; the proximal end unit grids of the embolectomy support are connected with each other and are intersected at the nearest end to form a transitional closing-up area; the embolectomy stent is a metal stent which is made by laser engraving a shape memory alloy tube with superelasticity effect and post-shaping treatment; the embolectomy system comprises an X-ray opaque developing ring which is arranged at the connecting position of the embolectomy bracket and the push-pull guide wire; the embolectomy system includes a protective tip in the form of an X-ray opaque coil at the distal-most position of the embolectomy support; the embolectomy system comprises a filament which is not transparent to X-rays and is wound on a rod of a part of unit grid of the embolectomy bracket; the sliding guide wire is coated with a lubricating coating which is a PTFE coating or a hydrophilic coating; the guiding sheath is made of polymer material polytetrafluoroethylene.

Images