Semi-covered stent, conveying system and operation method

Abstract

The invention relates to the technical field of medical instruments, in particular to a semi-covered stent, a delivery system and an operation method.The semi-covered stent comprises a tubular stent body and a covering film which is arranged on the tubular stent body and only covers the local surface of the tubular stent body, and the two ends of the tubular stent body are each provided with a first developing part; a second developing part is also arranged at the edge and / or the middle position of the covering film. The invention relates to a semi-covered stent, in particular to a semi-covered stent, and aims to overcome the defect that blood flow of normal blood vessels is affected by a membrane on the stent when aneurysm at bifurcated blood vessels is treated due to the fact that existing covered stents are all peripherally and completely covered with membranes, and the covered side of the semi-covered stent can well prevent the blood flow from flowing into the aneurysm. And the uncovered side does not influence the blood flow of normal blood vessels, so that a better treatment effect is achieved on aneurysm treatment at bifurcated blood vessels, and postoperative embolism is reduced.

Description

Technical Field

[0001] The present invention relates to the field of medical device technology, and more specifically, to a semi-covered stent, a delivery system and an operation method. Background Art

[0002] Aneurysm is a vascular disease, which refers to a sac-like structure formed by the expansion of a part of the blood vessel wall due to lesions. It can occur in any part of the body, but the most common ones are the aorta and cerebral blood vessels. The rupture of an aneurysm may cause severe bleeding and life-threatening, so timely treatment is essential. Surgical treatment is one of the main methods for treating aneurysms. The purpose of the operation is to isolate the aneurysm from normal blood flow to prevent it from rupture. According to the location and size of the aneurysm, surgical methods can be divided into open surgery and interventional surgery. Among them, interventional surgery is performed through a catheter in the blood vessel, and no surgery is required. The doctor will insert a thin catheter into the patient's artery, and then implant interventional materials such as stents or coils around or inside the aneurysm through the catheter to isolate it from normal blood flow and prevent rupture. Interventional surgery has little trauma and fast recovery, and is suitable for most aneurysm patients.

[0003] With the continuous development of interventional technology, the advantages of using luminal stents (such as covered stents) to treat aortic aneurysms and arterial dissections are becoming increasingly prominent. When using the covered stent, it is necessary to first compress the covered stent into the sheath lumen of the stent delivery device, and then puncture the blood vessel generally at the femoral artery or iliac artery, and use the guide wire to establish a track, and then establish a delivery path through the iliac artery-abdominal aorta-thoracic aorta-aortic arch-ascending aorta, and then deliver it to the designated location of the lesion, and finally release the covered stent. The membrane of the covered stent isolates the blood flow from the lesion, eliminates the impact of blood flow on the aneurysm wall or dissection rupture and false lumen at the lesion, establishes a channel for normal blood circulation, and then withdraws the guide wire and delivery device to achieve interventional treatment of aneurysms and arterial dissections.

[0004] However, in the current clinical interventional surgeries for the treatment of aneurysms, the covered stents commonly used are all stents with complete circumferential coverage. When treating aneurysms at bifurcated vessels, the membrane on the stent will affect the blood flow in normal blood vessels. At the same time, the contact area between the membrane and the blood vessel wall is large, which will increase the risk of postoperative embolism. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiency that the current covered stents are all covered completely in the circumferential direction, and the membrane on the stent will affect the blood flow of normal blood vessels when treating aneurysms at bifurcated blood vessels, and to provide a semi-covered stent, a delivery system and an operation method. The covered side of the semi-covered stent of the present invention can well prevent blood flow from flowing into the aneurysm, and the uncovered side will not affect the blood flow of normal blood vessels, which has a better therapeutic effect on the treatment of aneurysms at bifurcated blood vessels and reduces the occurrence of postoperative embolism.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A semi-coated stent comprises a tubular stent, a coating arranged on the tubular stent and covering only a partial surface of the tubular stent, first developing parts are arranged at both ends of the tubular stent, and a second developing part is also arranged at the edge and / or middle of the coating.

[0008] The semi-coated stent of the present invention can use the development imaging to determine the overall pushing position of the semi-coated stent with the help of the first development component, observe and determine whether the semi-coated stent has reached the specified position, use the development imaging to display the range of the coating with the help of the second development component, and determine whether the coated area covers the lesion position based on the development imaging. In this way, when treating aneurysms at bifurcated blood vessels, the present invention can accurately direct the coated area toward the aneurysm position and block the lesion in a targeted manner. When in use, the contact area between the coating and the blood vessel wall can be accurately controlled. One side of the coating can well prevent blood from flowing into the aneurysm to block the aneurysm neck, while other uncoated areas do not affect normal vascular blood flow, thereby improving the treatment efficacy and reducing the occurrence of postoperative embolism.

[0009] Furthermore, the tubular stent is a self-expanding tubular stent with hollow meshes, and the coating covers at least one rhombus-shaped hollow position on the same side of the tubular stent. The tubular stent with hollow meshes can be collapsed and expanded to a certain extent, and has better structural stability and provides good wall adhesion, so that one side of the coating can well prevent blood from flowing into the aneurysm and treat the aneurysm.

[0010] Furthermore, the second developing member is a C-shaped developing ring arranged at the edge and / or middle of the coating.

[0011] Furthermore, the second developing member is a platinum tungsten developing wire, and the coating is sutured onto the tubular support through the platinum tungsten developing wire.

[0012] It should be noted that when the first developing piece and the second developing piece are both set up using external developing pieces, the coating and the tubular support can be sewn together by sutures to obtain a number of suture points, and the size of the coating can be selected according to actual surgical needs; when the second developing piece is a platinum tungsten developing wire, since the platinum tungsten developing wire itself has a developing function, the coating can be directly sutured on the tubular support using the platinum tungsten developing wire to achieve the purpose of displaying the coating position.

[0013] The present invention also provides a semi-covered stent delivery system, comprising a core wire, a developing spring sequentially sleeved from the distal end to the proximal end of the core wire, the semi-covered stent as described above, and a hypotube, a delivery tube sleeved outside corresponding positions of the semi-covered stent and the hypotube, and a locking device provided at the proximal end of the core wire;

[0014] The locking device includes a first locker that is movably abutted against the delivery tube, and a second locker that is movably abutted against the core wire: when the first locker and the second locker simultaneously abut and lock the delivery tube and the core wire, rotating or pulling the locking device can cause the core wire and the parts covering it to rotate or displace as a whole; when only the first locker abuts and locks the delivery tube or only the second locker abuts and locks the core wire, rotating or pulling the locking device can cause the delivery tube to rotate or displace relative to other parts.

[0015] In the present invention, the core wire serves as the delivery body and the delivery tube serves as the release body. Through the cooperation of the locking device, the semi-covered stent can be delivered to the designated lesion location, and the first locker and the second locker can be used to simultaneously lock or individually lock the delivery tube and the core wire. The position of the semi-covered stent can be adjusted during the operation, so that the coated side faces the aneurysm and is accurately released after reaching the lesion site.

[0016] It should be noted that the developing spring is used for positioning during surgery; the hypotube is a long metal capillary and is an important component of the catheter for minimally invasive treatment. In interventional radiology, the hypotube is used to provide high-power X-rays so that doctors can observe angiography or other interventional operations in real time; the proximal end in the present invention refers to the end closer to the doctor during the surgical operation, and the distal end refers to the end away from the doctor during the surgical operation.

[0017] Furthermore, it also includes a recovery device, which is annular, sleeved on the outer periphery of the core wire and has the freedom to enter and exit the core wire and rotate on the core wire. The recovery device has a contact structure for pulling the semi-coated stent to retract and abut against it. The contact structure is a radial protrusion or a hook, and the protrusion or the hook is arranged in cooperation with the semi-coated stent.

[0018] It should be noted that when the semi-covered stent has not been released from the blood vessel and is still in a retracted posture, in fact, the semi-covered stent product will expand radially without constraints, which is the usual deformation property of medical stents. Therefore, as long as it has not been released from the blood vessel to participate in treatment, it is often necessary to use a recovery device to buckle the inner wall of the semi-covered stent and tighten it inward so that the semi-covered stent occupies as little radial space as possible; the contact structure can be a protrusion or hook with axial control that can be hooked and unhooked, and a pull line can be provided in the core wire to control the transmission of the hooking and unhooking movements; the recovery device can be designed to give / release constraints on one end of the semi-covered stent, or it can be designed to give / release constraints on both ends of the semi-covered stent at the same time; of course, the "recovery" (i.e. pulling back) mentioned in the recovery device is a mistake during the initial release. When it is discovered later, the position of the semi-covered stent can be corrected in time, which is a remedial measure under extreme circumstances.

[0019] Furthermore, the first locking device includes an adjusting chamber for the passage of the catheter, an adjusting cover-lifting wheel arranged at one end of the adjusting chamber and threadedly connected to the adjusting chamber, the inner wall of the adjusting chamber is provided with a circumferential conical inclined surface matching portion, and the adjusting chamber is also provided with a plurality of conical blocks arranged around the outer wall of the catheter, one end of the plurality of conical blocks abuts against the adjusting cover-lifting wheel, and when the adjusting cover-lifting wheel and the adjusting chamber thread are tightened, the conical inclined surface matching portion abuts against the plurality of conical blocks and makes the plurality of conical blocks close together, and the closed plurality of conical blocks causes the catheter to be subjected to a clamping force, so that the catheter and the first locking device remain locked and do not undergo relative movement; the structure of the second locking device is the same as that of the first locking device.

[0020] Furthermore, an elastic layer is provided on the side wall of the conical block in contact with the catheter. The elastic layer can increase the contact area and friction between the conical block and the catheter surface, improve the clamping effect, and not easily damage the catheter; the catheter in the present invention includes but is not limited to the core wire and the delivery tube.

[0021] Furthermore, the delivery tube includes an inner lining layer, an intermediate layer and an outer layer arranged in sequence from the inside to the outside, the intermediate layer includes a braided layer at the distal end and a hypotube layer at the proximal end. The material of the outer layer includes but is not limited to PET or Pebax material, the material of the inner lining layer includes but is not limited to PTFE material, and the size of the delivery tube is generally required to be compatible with a 5F intermediate catheter.

[0022] Furthermore, the core wire includes a first straight tube section, a first tapered tube section, a second straight tube section, a second tapered tube section and a third straight tube section connected in sequence from the far end to the proximal end, and the diameter of the core wire tapers from the proximal end to the distal end. In this way, the core wire has two tapered surfaces, which taper from the proximal end to the distal end. A head end developing spring is glued to the tapered surface of the second tapered tube section at the distal end for intraoperative positioning. The diameter of the second straight tube section can meet the requirements of the external semi-covered stent and the sea wave tube, and can be sleeved by the delivery tube. The diameter of the third straight tube section is larger, so that when the core wire at the proximal end is connected to the locking device, it can have a larger clamping surface, which facilitates the abutment of the second locking device against the core wire.

[0023] The present invention also provides an operation method of a semi-covered stent delivery system, which specifically comprises the following steps:

[0024] After the semi-covered stent delivery system is assembled, the delivery tube and the core wire are simultaneously abutted and locked by the first locking device and the second locking device;

[0025] Push the semi-covered stent delivery system to the lesion along the established surgical corridor;

[0026] Release the lock of the second locker on the core wire, keep the first locker abutting and locking the delivery tube, keep the core wire from moving, pull the locking device to drive the delivery tube to move relative to other parts, and release the head end of the semi-covered stent on the core wire;

[0027] The position of the second developing member in the semi-covered stent is observed by developing imaging to determine the direction and position of the covering: if the covering faces the lesion position, the locking device is continuously pulled to release the semi-covered stent; if the covering does not face the lesion position, the second locking device is used to abut and lock the core wire again, and the locking device is rotated to rotate the core wire and the parts covered thereon as a whole until the covering faces the lesion position;

[0028] Release the lock of the core wire by the second locker, and continue to pull the locking device to release the semi-covered stent;

[0029] After the semi-covered stent is completely released, other parts except the semi-covered stent are recovered.

[0030] It should be noted that the process of establishing the surgical channel includes using a guide wire and an intermediate catheter to establish a channel to reach the lesion location. The intermediate catheter is required to cross the aneurysm, and then the guide wire is withdrawn to complete the establishment of the surgical channel. The intermediate catheter can be withdrawn after the semi-covered stent delivery system is pushed to the lesion location; it should also be noted that the coaxially connected components such as the core wire, delivery tube, locking device, and semi-covered stent in the present invention can be connected and disconnected under the existing technology. Whether it is the core wire or the semi-covered stent and other components, the clamping force is applied / released, or the active part is an active hook-shaped structure, and the traction wire can be used to transmit the force from the proximal direction to achieve the evacuation of the parts from the human body, that is, "recovery" from the human body to the outside of the human body. Existing patent documents in this field have recorded the corresponding force transmission process, and the specific structure will not be repeated in this application.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The semi-coated stent of the present invention can use the development imaging to determine the overall pushing position of the semi-coated stent with the help of the first development component, observe and determine whether the semi-coated stent has reached the specified position, use the development imaging to display the range of the coating with the help of the second development component, and determine whether the coated area covers the lesion position based on the development imaging. In this way, when treating aneurysms at bifurcated blood vessels, the present invention can accurately direct the coated area toward the aneurysm position and block the lesion in a targeted manner. When in use, the contact area between the coating and the blood vessel wall can be accurately controlled. One side of the coating can well prevent blood from flowing into the aneurysm to block the aneurysm neck, while other uncoated areas do not affect normal vascular blood flow, thereby improving the treatment efficacy and reducing the occurrence of postoperative embolism.

[0033] The semi-covered stent delivery system of the present invention can deliver the semi-covered stent to a designated lesion location through the cooperation of a core wire, a delivery tube and a locking device, and utilizes the function of simultaneously locking the delivery tube and the core wire by the first locking device and the second locking device or locking the delivery tube and the core wire separately, so that the position of the semi-covered stent can be adjusted during the operation, so that the coated side faces the aneurysm and is accurately released after reaching the lesion site. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic structural diagram of an uncoated tubular stent in Example 1 of the present invention;

[0035] Figure 2 This is a schematic structural diagram of a tubular stent in a coated state in Example 1 of the present invention;

[0036] Figure 3 is a schematic structural diagram of another tubular stent in a coated state in Example 1 of the present invention;

[0037] Figure 4This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0038] Figure 5 It is a partial structural schematic diagram of the semi-covered stent delivery system in Example 3 of the present invention;

[0039] Figure 6 This is a schematic diagram of the structure of the delivery pipe in Example 3 of the present invention;

[0040] Figure 7 This is a schematic diagram of the structure of the core wire in Example 3 of the present invention;

[0041] Figure 8 This is a schematic diagram of the structure of the locking device in Example 3 of the present invention;

[0042] Fig. 9 Schematic diagram of the structure of the first locking device in Embodiment 3 of the present invention;

[0043] Fig.10 It is a side projection diagram of the first developing member and the second developing member in Embodiment 3 of the present invention;

[0044] Fig.11 It is a top view projection diagram of the first developing member and the second developing member in Example 3 of the present invention.

[0045] The illustrations are as follows:

[0046] 1-semi-coated stent, 11-tubular stent, 12-coated stent, 13-first developing member, 14-second developing member, 141-C-type developing ring, 142-platinum-tungsten developing wire;

[0047] 2-core wire, 21-first straight tube section, 22-first cone tube section, 23-second straight tube section, 24-second cone tube section, 25-third straight tube section;

[0048] 3-development spring;

[0049] 4-Hypotube;

[0050] 5- Recovery device;

[0051] 6-transmission tube, 61-braided layer, 62-hypotube layer, 63-outer layer, 64-inner lining layer;

[0052] 7-locking device, 71-first locker, 711-adjusting chamber, 712-adjusting cover-opening wheel, 713-conical slope matching part, 714-conical block, 715-elastic layer, 72-second locker. DETAILED DESCRIPTION

[0053] The present invention is further described below in conjunction with specific implementation methods. The accompanying drawings are only used for exemplary descriptions and are only schematic diagrams, not actual drawings, and cannot be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0054] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0055] Example 1

[0056] like Figures 1 to 3 As shown, a semi-coated stent 1 includes a tubular stent 11, a coating 12 arranged on the tubular stent 11 and covering only a partial surface of the tubular stent 11, a first developing member 13 is provided at both ends of the tubular stent 11, and a second developing member 14 is also provided at the edge and / or middle position of the coating 12.

[0057] In this embodiment, the tubular stent 11 is a self-expanding tubular stent with hollow meshes, and the coating 12 covers at least one diamond-shaped hollow position on the same side of the tubular stent 11. The tubular stent with hollow meshes can be collapsed and expanded to a certain extent, and has better structural stability and provides good wall adhesion, so that one side of the coating 12 can well prevent blood from flowing into the aneurysm and treat the aneurysm.

[0058] like Figures 2 to 3 As shown, the second developing member 14 is a C-shaped developing ring 141 disposed at the edge and / or the middle of the coating 12 .

[0059] In this embodiment, the first developing member 13 and the second developing member 14 are made of the same developing material.

[0060] like Figures 2 to 3 As shown, when the first developing member 13 and the second developing member 14 are both provided by external developing members, the covering film 12 and the tubular support 11 are sewn together by sutures to obtain a plurality of suture points 10. The size of the covering film 12 is selected according to actual surgical requirements. Figure 2 A larger area is covered by the film 12, Figure 3 The smaller area is covered by the coating 12 .

[0061] In this embodiment, the semi-coated stent 12 can use the development imaging to determine the overall pushing position of the semi-coated stent 12 with the help of the first development component 13, observe and determine whether the semi-coated stent 12 reaches the specified position, and use the development imaging to display the range of the coating 12 with the help of the second development component 14, and determine whether the coating 12 area covers the lesion location based on the development imaging. In this way, when treating aneurysms at bifurcated blood vessels, the present invention can accurately direct the coating 12 area toward the aneurysm location and perform targeted lesion blocking. When in use, the contact area between the coating 12 and the blood vessel wall can be accurately controlled. One side of the coating 12 can effectively prevent blood from flowing into the aneurysm to block the aneurysm neck, while other uncoated areas 12 do not affect normal vascular blood flow, thereby improving the treatment efficacy and reducing the occurrence of postoperative embolism.

[0062] Example 2

[0063] This embodiment is similar to Embodiment 1, except that in this embodiment:

[0064] like Figure 4 As shown, the second developing member 14 is a platinum tungsten developing wire 142 , and the coating 12 is sutured onto the tubular support 11 through the platinum tungsten developing wire 142 .

[0065] When the second developing member 14 is a platinum tungsten developing wire 142 , since the platinum tungsten developing wire 142 itself has a developing function, the coating 12 can be directly sutured on the tubular support 11 using the platinum tungsten developing wire 142 to achieve the purpose of displaying the position of the coating 12 .

[0066] The other structures and principles of this embodiment are the same as those of Embodiment 1.

[0067] Example 3

[0068] like Figures 5 to 9 As shown, a semi-covered stent delivery system comprises a core wire 2, a developing spring 3 sequentially sleeved from the distal end to the proximal end of the core wire 2, a semi-covered stent 12 as described in the above embodiment 1 or embodiment 2, and a hypotube 4, a delivery tube 6 sleeved outside the corresponding positions of the semi-covered stent 12 and the hypotube 4, and a locking device 7 provided at the proximal end of the core wire 2;

[0069] like Figure 8As shown, the locking device 7 includes a first locker 71 that is movably abutted against the delivery tube 6, and a second locker 72 that is movably abutted against the core wire 2: when the first locker 71 and the second locker 72 simultaneously abut and lock the delivery tube 6 and the core wire 2, rotating or pulling the locking device 7 can cause the core wire 2 and the parts covering it to rotate or displace as a whole; when only the first locker 71 abuts and locks the delivery tube 6 or only the second locker 72 abuts and locks the core wire 2, rotating or pulling the locking device 7 can cause the delivery tube 6 to rotate or displace relative to other parts.

[0070] like Figure 7 As shown, in this embodiment, the core wire 2 serves as the delivery body and the delivery tube 6 serves as the release body. Through the cooperation of the locking device 7, the semi-covered stent 12 can be delivered to the designated lesion location, and the first locker 71 and the second locker 72 can be used to simultaneously lock or individually lock the delivery tube 6 and the core wire 2. The position of the semi-covered stent 12 can be adjusted during the operation, so that the side with the coating 12 faces the aneurysm and is accurately released after reaching the lesion site.

[0071] It should be noted that the developing spring 3 is used for positioning during surgery; the hypotube 4 is a long metal capillary and is an important component of the catheter for minimally invasive treatment. In interventional radiology, the hypotube 4 is used to provide high-power X-rays so that doctors can observe angiography or other interventional operations in real time; the proximal end in the present invention refers to the end closer to the doctor during the surgical operation, and the distal end refers to the end away from the doctor during the surgical operation.

[0072] like Figure 5 and Figure 7 As shown, it also includes a recovery device 5, which is annular, sleeved on the outer periphery of the core wire 2 and has the freedom to enter and exit the core wire 2 and rotate on the core wire 2. The recovery device 5 has a contact structure for pulling the semi-coated stent 1 to retract and abut against it. The contact structure is a radial protrusion or a hook, and the protrusion or the hook is arranged in cooperation with the semi-coated stent 1.

[0073] It should be noted that when the semi-covered stent 12 has not yet been released from the blood vessel and is still in a retracted posture, in fact, the semi-covered stent 12 product will expand radially without constraints, which is the usual deformation property of medical stent-type devices. Therefore, as long as it has not yet been released from the blood vessel to participate in the treatment, it is often necessary for the recovery device to buckle the inner wall of the semi-covered stent 12 and tighten it inward so that the semi-covered stent 12 occupies as little radial space as possible; the contact structure can be a protrusion or hook that can be hooked and unhooked, axially controlled, and a pull line can be provided in the core wire 2 to control the transmission of the hooking and unhooking movements; the recovery device 5 can be designed to give / unhook one end of the semi-covered stent, or it can be designed to give / unhook both ends of the semi-covered stent at the same time; of course, the "recovery" (i.e. pulling back) mentioned in the recovery device 5 is a mistake during the initial release. When it is discovered later, the position of the semi-covered stent 12 can be corrected in time, which is a remedial measure under extreme circumstances.

[0074] like Fig. 9 As shown, the first locking device 71 includes an adjusting chamber 711 for the passage of a catheter, an adjusting cover-opening wheel 712 arranged at one end of the adjusting chamber 711 and threadedly connected to the adjusting chamber 711, an inner wall of the adjusting chamber 711 is provided with a circumferential conical inclined surface matching portion 713, and a plurality of conical blocks 714 arranged around the outer wall of the catheter are further provided in the adjusting chamber 711, one end of the plurality of conical blocks 714 abuts against the adjusting cover-opening wheel 712, when the adjusting cover-opening wheel 712 and the adjusting chamber 711 are threadedly tightened, the conical inclined surface matching portion 713 abuts against the plurality of conical blocks 714 and makes the plurality of conical blocks 714 close together, and the closed plurality of conical blocks 714 causes the catheter to be subjected to a clamping force, so that the catheter and the first locking device 71 remain locked and do not undergo relative movement; the structure of the second locking device 72 is the same as that of the first locking device 71.

[0075] In this embodiment, the inner wall of the cover-adjusting wheel 712 and the outer wall of the adjusting chamber 711 are respectively provided with matching threads; the outer wall of the cover-adjusting wheel 712 is provided with a gear convex ring, which can increase the contact friction during holding and rotation.

[0076] like Fig. 9As shown, the side wall of the conical block 714 on which the conduit contacts is also provided with an elastic layer 715. The provision of the elastic layer 715 can increase the contact area and friction between the conical block 714 and the conduit surface, improve the clamping effect, and not easily damage the conduit; in this embodiment, the first locker 71 is used for the conveying tube 6 to pass through, and the second locker 72 is used for the core wire 2 to pass through. The structure of the second locker 72 is set with reference to the structure of the first locker 71, and the adjustment cover wheel of the second locker 72 and the adjustment chamber can actually refer to the above scheme, which is used to temporarily lock the core wire 2, but the adjustment cover wheel of the second locker 72 should have an avoidance structure according to the design habit, avoiding the position of the proximal end of the adjustment chamber of the first locker 71. The shell where the adjustment chamber of the second locker 72 is located and the shell where the adjustment chamber of the first locker 71 is located are kept relatively still and can even be integrally formed. It will not be repeated here.

[0077] like Figure 6 As shown, the delivery tube 6 includes an inner lining layer 64, an intermediate layer and an outer layer 63 which are arranged in sequence from the inside to the outside. The intermediate layer includes a braided layer 61 located at the distal end and a hypotube layer 62 located at the proximal end.

[0078] In this embodiment, the outer layer 63 is made of PET or Pebax material, the inner lining layer 64 is made of PTFE material, and the size of the delivery tube 6 is compatible with a 5F intermediate catheter.

[0079] like Figure 7 As shown, the core wire 2 includes a first straight tube section 21, a first tapered tube section 22, a second straight tube section 23, a second tapered tube section 24 and a third straight tube section 25 connected in sequence from the far end to the near end, and the diameter of the core wire 2 gradually tapers from the near end to the far end. In this way, the core wire 2 has two tapered surfaces, which taper from the near end to the far end. A head end developing spring 3 is glued to the tapered surface of the second tapered tube section 24 at the far end for intraoperative positioning. The diameter of the second straight tube section 23 can meet the requirements of the external semi-covered stent 12 and the sea wave tube 4, and can be sleeved by the delivery tube 6. The diameter of the third straight tube section 25 is relatively large, so that when the core wire 2 at the proximal end is connected to the locking device 7, it can have a larger clamping surface, which facilitates the abutment of the second locking device 72 against the core wire 2.

[0080] In this embodiment, an operation method of a semi-covered stent delivery system specifically includes the following steps:

[0081] After the semi-covered stent delivery system is assembled, the first locking device 71 and the second locking device 72 are used to simultaneously abut and lock the delivery tube 6 and the core wire 2;

[0082] Push the semi-covered stent delivery system to the lesion along the established surgical corridor;

[0083] Release the lock of the second locker 72 on the core wire 2, keep the first locker 71 abutting and locking the delivery tube 6, keep the core wire 2 from moving, pull the locking device 7 to drive the delivery tube 6 to move relative to other parts, and release the head end of the semi-covered stent 12 on the core wire 2;

[0084] like Fig.10 and Fig.11 As shown, the position of the second developing member 14 in the semi-filmed stent 12 is observed by developing imaging to determine the direction and position of the film 12: if the film 12 is facing the lesion position, the locking device 7 is continuously pulled to release the semi-filmed stent 12; if the film 12 is not facing the lesion position, the second locking device 72 is used to abut and lock the core wire 2 again, and the locking device 7 is rotated to rotate the core wire 2 and the parts covered thereon as a whole until the film 12 is facing the lesion position;

[0085] Release the lock of the second locker 72 on the core wire 2, and then continue to pull the locking device 7 to release the semi-covered stent 12;

[0086] After the semi-coated stent 12 is completely released, the other parts except the semi-coated stent 12 are recovered.

[0087] It should be noted that the process of establishing the surgical channel includes using the guide wire and the intermediate catheter to establish a channel to reach the lesion position. The intermediate catheter is required to cross the aneurysm, and then the guide wire is withdrawn to complete the establishment of the surgical channel. The intermediate catheter can be withdrawn after the semi-covered stent delivery system is pushed to the lesion position. It should also be noted that in this embodiment, the coaxially connected components such as the core wire 2, the delivery tube 6, the locking device 7, the semi-covered stent 12, etc. can be connected and disconnected under the existing technology. Whether it is the core wire 2 or the semi-covered stent 12 and other components, the clamping force is applied / released, or the active part is a movable hook-shaped structure, and the traction wire can be used to conduct the force from the proximal direction to achieve the evacuation of the parts from the human body, that is, "recovery" from the human body to the outside of the human body. Existing patent documents in this field have recorded the corresponding force transmission process, and the specific structure will not be repeated in this application.

[0088] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A semi-covered stent (1), characterized in that: The invention comprises a tubular support (11), a coating (12) arranged on the tubular support (11) and covering only a partial surface of the tubular support (11), first developing members (13) being arranged at both ends of the tubular support (11), and a second developing member (14) being arranged at the edge and / or the middle of the coating (12).

2. A semi-covered stent (1) according to claim 1, characterized in that: The tubular stent (11) is a self-expanding tubular stent with hollow meshes, and the coating (12) covers at least one diamond-shaped hollow position on the same side of the tubular stent (11).

3. A semi-covered stent (1) according to claim 1 or 2, characterized in that: The second developing member (14) is a C-shaped developing ring (141) arranged at the edge and / or the middle of the coating (12).

4. A semi-covered stent (1) according to claim 1 or 2, characterized in that: The second developing member (14) is a platinum tungsten developing wire (142), and the coating (12) is sutured onto the tubular support (11) via the platinum tungsten developing wire (142).

5. A semi-covered stent delivery system, characterized in that: It comprises a core wire (2), a developing spring (3) sleeved in sequence from the distal end to the proximal end of the core wire (2), a semi-covered stent (1) as claimed in any one of claims 1 to 4, and a hypotube (4), a delivery tube (6) sleeved outside the corresponding positions of the semi-covered stent (1) and the hypotube (4), and a locking device (7) provided at the proximal end of the core wire (2); The locking device (7) comprises a first locking device (71) movably abutting against the delivery tube (6), and a second locking device (72) movably abutting against the core wire (2): when the first locking device (71) and the second locking device (72) simultaneously abut and lock the delivery tube (6) and the core wire (2), rotating or pulling the locking device (7) can cause the core wire (2) and the parts covered thereon to rotate or move as a whole; when only the first locking device (71) abuts and locks the delivery tube (6) or only the second locking device (72) abuts and locks the core wire (2), rotating or pulling the locking device (7) can cause the delivery tube (6) to rotate or move relative to other parts.

6. A semi-covered stent delivery system according to claim 5, characterized in that: It also includes a recovery device (5), which is annular, sleeved on the outer periphery of the core wire (2) and has the freedom to enter and exit the core wire (2) and rotate on the core wire (2), and the recovery device (5) has a contact structure for pulling the semi-coated stent (1) to retract and abut, and the contact structure is a radial protrusion or a retractor, and the protrusion or the retractor is arranged in cooperation with the semi-coated stent (1).

7. A semi-covered stent delivery system according to claim 5, characterized in that: The first locking device (71) comprises an adjusting chamber (711) for the catheter to pass through, an adjusting cover wheel (712) arranged at one end of the adjusting chamber (711) and threadedly connected to the adjusting chamber (711), the inner wall of the adjusting chamber (711) is provided with a circumferential conical inclined surface matching portion (713), and the adjusting chamber (711) is further provided with a plurality of conical blocks (714) arranged around the outer wall of the catheter, one end of the plurality of conical blocks (714) abutting against the adjusting cover wheel (712). The cover wheel (712) is provided with a cover wheel (712). When the cover wheel (712) is screwed onto the adjusting chamber (711), the conical inclined surface matching portion (713) abuts against a plurality of the conical blocks (714) and causes the plurality of the conical blocks (714) to close together. The closed plurality of the conical blocks (714) causes the catheter to be clamped, and the catheter and the first locker (71) are locked and do not cause relative movement. The structure of the second locker (72) is the same as that of the first locker (71).

8. A semi-covered stent delivery system according to claim 5, characterized in that: The delivery tube (6) comprises an inner lining layer (64), an intermediate layer and an outer layer (63) which are arranged in sequence from the inside to the outside, wherein the intermediate layer comprises a braided layer (61) located at the distal end and a hypotube layer (62) located at the proximal end.

9. A semi-covered stent delivery system according to claim 5, characterized in that: The core wire (2) comprises a first straight tube section (21), a first tapered tube section (22), a second straight tube section (23), a second tapered tube section (24) and a third straight tube section (25) which are sequentially connected from the distal end to the proximal end, and the diameter of the core wire (2) gradually tapers from the proximal end to the distal end.

10. The method for operating a semi-covered stent delivery system according to any one of claims 5 to 9, characterized in that: The specific steps include: After the semi-covered stent delivery system is assembled, the first locking device (71) and the second locking device (72) are used to simultaneously abut and lock the delivery tube (6) and the core wire (2); Push the semi-covered stent delivery system to the lesion along the established surgical corridor; Release the lock of the core wire (2) by the second locker (72), keep the first locker (71) in contact with and locked on the delivery tube (6), keep the core wire (2) from being displaced, pull the locking device (7) to drive the delivery tube (6) to be displaced relative to other parts, and release the head end of the semi-covered stent (1) on the core wire (2); The position of the second developing member (14) in the semi-coated stent (1) is observed by developing imaging to determine the orientation and position of the coating (12): if the coating (12) is oriented toward the lesion position, the locking device (7) is continuously pulled to release the semi-coated stent (1); if the coating (12) is not oriented toward the lesion position, the second locking device (72) is used to abut and lock the core wire (2) again, and the locking device (7) is rotated to rotate the core wire (2) and the parts covering it as a whole until the coating (12) is oriented toward the lesion position; Release the locking of the core wire (2) by the second locking device (72), and then continue to pull the locking device (7) to release the semi-covered stent (1); After the semi-covered stent (1) is completely released, other parts except the semi-covered stent (1) are recovered.

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