A semi-covered stent, delivery system and operation method

Abstract

The present invention relates to the field of medical device technology, and more specifically, to a semi-covered stent, a delivery system, and an operating method, wherein the semi-covered stent comprises a tubular stent, a coating provided on the tubular stent and covering only a portion of the surface of the tubular stent, a first developing member provided at both ends of the tubular stent, and a second developing member provided at the edge and / or middle of the coating. The purpose of the present invention is to overcome the deficiency that the current covered stents are all completely covered in the circumferential direction, and the membrane on the stent affects the blood flow of normal blood vessels when treating aneurysms at bifurcated blood vessels. The coated side of the semi-covered stent of the present invention can effectively prevent blood from flowing into the aneurysm, and the uncoated side will not affect the blood flow of normal blood vessels. It has a better therapeutic effect on the treatment of aneurysms at bifurcated blood vessels and reduces the occurrence of postoperative embolism.

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 when a part of the blood vessel wall expands due to a lesion. 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 crucial. Surgical treatment is one of the main methods for treating aneurysms. The purpose of the surgery is to isolate the aneurysm from the normal blood flow to prevent it from rupture. Depending on the location and size of the aneurysm, surgical methods can be divided into open surgery and interventional surgery. Among them, interventional surgery is performed in the blood vessels through a catheter, 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 the normal blood flow and prevent rupture. Interventional surgery has less trauma and faster 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 a covered stent, it is necessary to first compress the covered stent into the sheath lumen of the stent delivery device, and then generally puncture the blood vessel at the femoral artery or iliac artery, and use a guide wire to establish a track. The delivery device then establishes a delivery path through the iliac artery-abdominal aorta-thoracic aorta-aortic arch-ascending aorta, and then delivers it to the designated location of the lesion. Finally, the covered stent is released. 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 treating 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 present invention aims to overcome the drawback of existing stent grafts, which are all completely circumferentially coated. This stent graft, when used to treat bifurcated aneurysms, can affect blood flow in normal vessels. The present invention provides a semi-covered stent, a delivery system, and an operating method. The coated side of the semi-covered stent effectively blocks blood flow into the aneurysm, while the uncoated side does not affect blood flow in normal vessels. This provides a more effective treatment for bifurcated aneurysms and reduces the risk of postoperative embolism.

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

[0007] A semi-covered stent comprises a tubular stent and a coating arranged on the tubular stent and covering only a part of the surface of the tubular stent. Both ends of the tubular stent are provided with a first developing member, and the edge and / or middle of the coating are also provided with a second developing member.

[0008] The semi-covered stent of the present invention can use the development imaging to determine the overall pushing position of the semi-covered stent with the help of the first development component, observe and determine whether the semi-covered stent reaches 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 coating 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 coating area toward the aneurysm position and perform targeted lesion blocking. 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 a hollow mesh, and the membrane covers at least one diamond-shaped hollow portion on the same side of the tubular stent. The tubular stent with the hollow mesh can be collapsed and expanded to a certain extent, and has improved structural stability and good wall adhesion. Thus, one side of the membrane can effectively prevent blood flow into the aneurysm, thereby treating the aneurysm.

[0010] Furthermore, the second developing member is a C-shaped developing ring provided at the edge and / or the 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 member and the second developing member are both set up using external developing members, the coating and the tubular bracket can be sewn together by sutures to obtain several suture points, and the size of the coating can be selected according to actual surgical needs; when the second developing member 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 bracket using the platinum tungsten developing wire, thereby achieving the purpose of displaying the position of the coating.

[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, 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 covered 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 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-covered stent back and abutting it. The contact structure is a radial protrusion or a hook, and the protrusion or the hook is arranged in cooperation with the semi-covered stent.

[0018] It should be noted that when the semi-covered stent is still in a collapsed position before being released from the blood vessel, it will actually expand radially when unconstrained, a characteristic of medical stent-type devices. Therefore, as long as the semi-covered stent is not released and is being used for treatment in the blood vessel, a retrieval device is often required to latch onto the inner wall of the semi-covered stent, tightening it inward to minimize the radial space occupied by the semi-covered stent. The contact structure can include an axially controlled protrusion or retractor that can be engaged and disengaged, and a pull wire can be included within the core wire to control the engagement and disengagement movements. The retrieval device can be designed to constrain or release one end of the semi-covered stent, or simultaneously constrain both ends of the semi-covered stent. Of course, the "retrieval" (i.e., pulling back) referred to in the retrieval device is a malfunction during initial release. Upon subsequent discovery, the position of the semi-covered stent can be promptly corrected, representing a remedial measure in extreme circumstances.

[0019] Furthermore, the first locking device includes an adjusting chamber for the passage of the catheter, an adjusting cover-lifting wheel provided 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 fitting 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 fitting portion abuts against the plurality of conical blocks and causes the plurality of conical blocks to 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 move relative to each other; 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 sidewall of the conical block that contacts the catheter. The elastic layer increases the contact area and friction between the conical block and the catheter surface, improving the clamping effect while preventing damage to the catheter. The catheter in the present invention includes, but is not limited to, a core wire and a delivery tube.

[0021] The delivery tube further comprises, from the inside out, an inner lining layer, an intermediate layer, and an outer layer. The intermediate layer comprises a braided layer at the distal end and a hypotube layer at the proximal end. The outer layer may be made of, but not limited to, PET or Pebax, and the inner lining may be made of, but not limited to, PTFE. The delivery tube is generally designed 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, which are sequentially connected from the distal end to the proximal end, and the diameter of the core wire gradually tapers from the proximal end to the distal end. In this way, the core wire has two tapered surfaces, which taper gradually from the proximal end to the distal end. A head-end developing spring is adhered 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 an external semi-covered stent and a hypotube, and can be sheathed by a 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 operating method of a semi-covered stent delivery system, which specifically comprises the following steps:

[0024] Assemble the semi-covered stent delivery system, and use the first locker and the second locker to simultaneously abut and lock the delivery tube and the core wire;

[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 in contact with and locked on the delivery tube, keep the core wire from moving, pull the locking device to cause 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 imaging to determine the orientation and position of the covering: if the covering is facing the lesion, the locking device is further pulled to release the semi-covered stent; if the covering is not facing the lesion, 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 covering it as a whole until the covering is facing the lesion;

[0028] Release the lock of the core wire by the second locker, and then 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 a surgical channel includes using a guide wire and an intermediate catheter to establish a channel to the lesion location. The intermediate catheter is required to pass over 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 a movable hook-shaped structure, which can use the traction wire 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 described in detail in this application.

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

[0032] The semi-covered stent of the present invention can use the development imaging to determine the overall pushing position of the semi-covered stent with the help of the first development component, observe and determine whether the semi-covered stent reaches 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 coating 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 coating area toward the aneurysm position and perform targeted lesion blocking. 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. By utilizing 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 individually, the position of the semi-covered stent can be adjusted during the operation so that the covered side faces the aneurysm and is accurately released after reaching the lesion site. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the structure of the uncoated tubular stent in Example 1 of the present invention;

[0035] Figure 2 Schematic diagram of the structure of the tubular stent in the coated state in Example 1 of the present invention;

[0036] Figure 3 Schematic diagram of the structure of another tubular stent in a film-coated state in Example 1 of the present invention;

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

[0038] Figure 5 Schematic diagram of the partial structure of the semi-covered stent delivery system in Example 3 of the present invention;

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

[0040] Figure 7 Schematic diagram of the structure of the core wire in Example 3 of the present invention;

[0041] Figure 8 Schematic diagram of the structure of the locking device in Example 3 of the present invention;

[0042] Figure 9 Schematic diagram of the structure of the first locking device in Example 3 of the present invention;

[0043] Figure 10 A side projection diagram of the first developing member and the second developing member in Example 3 of the present invention;

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

[0045] The icon marks are explained as follows:

[0046] 1-semi-covered stent, 11-tubular stent, 12-covered 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 pipe section, 22-first tapered pipe section, 23-second straight pipe section, 24-second tapered pipe section, 25-third straight pipe section;

[0048] 3-developing spring;

[0049] 4-Hypotube;

[0050] 5- Recovery device;

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

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

[0053] The present invention is further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted from the drawings.

[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, and does not indicate or imply 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 limiting 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 a hollow mesh. The coating 12 covers at least one diamond-shaped hollow portion on the same side of the tubular stent 11. The tubular stent with a hollow mesh can collapse and expand to a certain extent, and has better structural stability and good wall adhesion. Thus, one side of the coating 12 can effectively prevent blood flow into the aneurysm, thereby treating the aneurysm.

[0058] like Figures 2 to 3 As shown, the second developing member 14 is a C-shaped developing ring 141 provided 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 as 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 the actual surgical requirements. Figure 2 A larger area of ​​film 12 is covered, Figure 3 The smaller area is covered by the film 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 position 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 position 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 well 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:

[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 includes 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 Example 1 or Example 2 above, and a hypotube 4, a delivery tube 6 sleeved outside 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 back and abutting it. The contact structure is a radial protrusion or a hook, and the protrusion or the hook is arranged in conjunction 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 collapsed position, it will actually expand radially when unconstrained, which is a common deformation property of medical stent-type devices. Therefore, as long as it has not yet been released from the blood vessel to provide treatment, a retrieval device is often required to snap onto the inner wall of the semi-covered stent 12 and pull it inward to minimize the radial space occupied by the semi-covered stent 12. The contact structure can be a protrusion or hook with axial control that can be locked and released. The core wire 2 can be provided with a pull wire to control the transmission of the locking and releasing movements. The retrieval device 5 can be designed to apply / release constraints to one end of the semi-covered stent or to apply / release constraints to both ends of the semi-covered stent simultaneously. Of course, the "retrieval" (i.e., pulling back) mentioned in the retrieval device 5 is a mistake during initial release. If discovered later, the position of the semi-covered stent 12 can be corrected in a timely manner, which is a remedial measure in extreme situations.

[0074] like Figure 9 As shown, the first locker 71 includes an adjusting chamber 711 for the passage of a catheter, an adjusting cover-pushing wheel 712 provided 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 are further provided in the adjusting chamber 711 around the outer wall of the catheter, one end of the plurality of conical blocks 714 abuts against the adjusting cover-pushing wheel 712, and when the adjusting cover-pushing wheel 712 is threadedly tightened with the adjusting chamber 711, the conical inclined surface matching portion 713 abuts against the plurality of conical blocks 714 and causes the plurality of conical blocks 714 to close together, and the closed plurality of conical blocks 714 clamps the catheter, so that the catheter and the first locker 71 remain locked and do not move relative to each other; the structure of the second locker 72 is the same as that of the first locker 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 Figure 9As shown, the side wall of the conical block 714 that contacts the catheter 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 catheter surface, improving the clamping effect while also preventing damage to the catheter. In this embodiment, the first locking device 71 is used for the passage of the delivery tube 6, and the second locking device 72 is used for the passage of the core wire 2. The structure of the second locking device 72 is configured with reference to the structure of the first locking device 71, and the adjustment wheel of the second locking device 72 and the adjustment chamber can actually refer to the above scheme to temporarily lock the core wire 2. However, according to design practices, the adjustment wheel of the second locking device 72 should have an avoidance structure to avoid the position of the proximal end of the adjustment chamber of the first locking device 71. The housing where the adjustment chamber of the second locking device 72 is located and the housing where the adjustment chamber of the first locking device 71 is located remain relatively stationary and can even be integrally formed. This will not be described in detail 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 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 distal end to the proximal end, and the diameter of the core wire 2 gradually tapers from the proximal end to the distal end. In this way, the core wire 2 has two tapered surfaces, which are gradually tapered from the proximal end to the distal end. A head end developing spring 3 is attached to the tapered surface of the second tapered tube section 24 at the distal 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 hypotube 4, and can be sheathed by the delivery tube 6. The diameter of the third straight tube section 25 is larger, 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 operating method of a semi-covered stent delivery system specifically includes the following steps:

[0081] After assembling the semi-covered stent delivery system, use the first locker 71 and the second locker 72 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 in contact with and locked on the delivery tube 6, and prevent the core wire 2 from moving. Pull the locking device 7 to cause the delivery tube 6 to move relative to other parts, so that the head end of the semi-covered stent 12 on the core wire 2 is released.

[0084] like Figure 10 and Figure 11 As shown, the position of the second developing member 14 in the semi-covered stent 12 is observed by developing imaging to determine the orientation and position of the covering 12: if the covering 12 is facing the lesion position, the locking device 7 is further pulled to release the semi-covered stent 12; if the covering 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 covering it as a whole until the covering 12 is facing the lesion position;

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

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

[0087] 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 pass over 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 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, which can use the traction wire 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 described in detail in this application.

[0088] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A semi-covered stent delivery system, characterized in that: It comprises a core wire (2), a developing spring (3), a semi-covered stent (1), and a hypotube (4) which are sequentially sleeved from the distal end to the proximal end of the core wire (2), a delivery tube (6) sleeved outside 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) includes a first locking device (71) that is movably connected to the delivery tube (6), and a second locking device (72) that is movably connected to the core wire (2); the first locking device (71) includes an adjusting chamber (711) for the passage of the catheter, an adjusting cover wheel (712) that is arranged at one end of the adjusting chamber (711) and is 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 also provided with a plurality of conical Block (714), one end of a plurality of the conical blocks (714) abuts against the regulating cover wheel (712), and when the regulating cover wheel (712) and the regulating chamber (711) are screwed together, the conical inclined surface matching portion (713) abuts against the plurality of the conical blocks (714) and causes the plurality of the conical blocks (714) to close together, and the closed plurality of the conical blocks (714) causes the catheter to be clamped, and the catheter and the first locking device (71) remain locked and do not move relative to each other; the structure of the second locking device (72) is the same as that of the first locking device (71); 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 covering it to rotate or displace 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 displace relative to other parts.

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

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

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

5. A semi-covered stent delivery system according to claim 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).

6. A semi-covered stent delivery system according to claim 1, characterized in that: It also includes a retrieval device (5), which is annular, sleeved on the 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 retrieval device (5) has a contact structure for pulling the semi-covered stent (1) back and abutting, and the contact structure is a radial protrusion or a retractor, and the protrusion or the retractor is arranged in cooperation with the semi-covered stent (1).

7. A semi-covered stent delivery system according to claim 1, characterized in that: The delivery tube (6) comprises an inner lining layer (64), an intermediate layer, and an outer layer (63) 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.

8. The semi-covered stent delivery system according to claim 1, 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.

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