Abdominal aorta stent system

Abstract

The present invention discloses an abdominal aorta stent system, wherein the coated stent comprises a stent body, a contralateral branch and an ipsilateral branch, wherein the contralateral branch and the ipsilateral branch are respectively connected to one end of the stent body; the delivery system comprises an outer sheath tube and a central rod, wherein the outer sheath tube is sleeved outside the central rod, and the delivery system is further provided with a restraining rod; during delivery, the central rod passes through the ipsilateral branch and the stent body, and one end of the restraining rod is located in the contralateral branch; a positioning sensor is used to position the coated stent; at least two positioning sensors are provided, which are respectively located at different openings of the coated stent, and at least one sensor is located at the opening of the contralateral branch, and the positioning sensor is used to detect the opening data of the coated stent. In the abdominal aorta stent system of the present invention, the sensor is separable from the coated stent; the sensor is arranged in a limited space to position the stent opening; and the release degree of the stent is detected in real time.

Description

Technical Field

[0001] The invention relates to the technical field of stent graft positioning, and in particular to an abdominal aorta stent system. Background Art

[0002] In the existing covered stent implantation technology solution, the positioning is performed using X-rays, which cannot intuitively present the three-dimensional structure of the stent and can only display a plan view in one direction. Especially in the operation of abdominal aortic aneurysm, the machine needs to be inserted through the opening of the stent because the opening of the stent floats in the blood vessel. Traditional X-rays cannot obtain the three-dimensional relative position of other instruments and the stent from one perspective, so it often takes repeated attempts to insert the instrument into the opening of the stent. This process takes a lot of time and is exposed to a lot of radiation.

[0003] Traditional surgical data methods such as radiography do provide doctors with two-dimensional images of the operation, but they still lack accuracy and three-dimensionality. The impact of this limitation is particularly evident during surgical operations. Doctors often need to make judgments based on incomplete information, which increases the difficulty of the operation and may prolong the operation time. In addition to operational difficulties, high radiation doses are another major problem with traditional radiography. Doctors and patients are exposed to radiation during surgery, which may have serious health effects over a long period of time. Studies have shown that medical personnel engaged in radiation-related work have a significantly higher risk of cancer than other occupations.

[0004] In interventional surgeries, such as cardiac radiofrequency ablation, magnetic positioning sensors can be embedded in the device to achieve the function of positioning the device. During the operation, the sensor signal is connected to the magnetic positioning device through the cable operated by the device to parse the position information. After the operation, the sensor is removed from the body along with the device.

[0005] Implanted devices remain in the patient's body for a long time, and magnetic positioning must transmit the positioning information obtained by the sensor to the device outside the body through cables. Therefore, the implantation surgery does not support the long-term fixation of the sensor to the device. An ingenious method must be designed to separate the sensor fixed on the sensor from the body.

[0006] In addition, sensors can obtain position information, which is a common technical means, but it is difficult to use sensors for flexible objects. In existing products or patents, position sensors are often used for three-dimensional reconstruction of rigid objects, such as retrieved ablation needles, such as ablation catheters commonly used in the field of electrophysiology. Through a sensor information and the relative position of the instrument feature point and the sensor, the position information of the rigid connection part between the instrument and the sensor can be obtained. Therefore, in the traditional method, the key point of positioning through sensors is to use a sensor to rigidly connect the instrument, requiring no deformation between the instrument positioning position and the sensor. Summary of the invention

[0007] In view of the above technical problems to be solved, the present invention provides an abdominal aorta stent system, which enables the stent to be accurately positioned in the body.

[0008] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0009] An abdominal aorta stent system comprises a coated stent, a conveying system, and also comprises a positioning sensor, wherein the coated stent comprises a stent body, a contralateral branch and an ipsilateral branch, wherein the contralateral branch and the ipsilateral branch are respectively connected to one end of the stent body, and the contralateral branch and the ipsilateral branch are located at the same end of the stent body; the conveying system comprises an outer sheath tube and a central rod, wherein the outer sheath tube is sleeved outside the central rod, and the conveying system is also provided with a restraining rod; during conveying, the central rod passes through the ipsilateral branch and the stent body, and one end of the restraining rod is located in the contralateral branch; three positioning sensors are provided, including a first sensor, a second sensor and a third sensor, wherein the first sensor is arranged on the central rod for locating the position of the distal opening of the coated stent; the second sensor is arranged on the restraining rod for locating the position of the opening of the contralateral branch; the third sensor is arranged on the central rod for locating the position of the opening of the ipsilateral branch;

[0010] When the stent system is in use, before the stent graft is released, the stent graft collapses and contracts toward the axis of the central rod, and the direction of the connection line between the contralateral branch and the ipsilateral branch is obtained through the data collected by the first sensor, the second sensor, and the third sensor, thereby completing the three-dimensional reconstruction of the stent graft;

[0011] The coordinates of the center position of the contralateral branch opening are calibrated before loading. When the coated stent is gradually released to the contralateral branch, the center position of the contralateral branch opening is obtained to reconstruct the circle of the contralateral branch opening.

[0012] As a further improvement of the above technical solution:

[0013] Preferably, the coated stent also includes a bare stent, one end of which is fixed at the distal opening of the stent body, and the bare stent can be released or retracted; the first sensor is located in the stent body and at the connection surface between the stent body and the bare stent or near the opening in the bare stent or near the opening of the stent body.

[0014] Preferably, the second sensor is located in the contralateral branch and close to the opening end surface of the contralateral branch.

[0015] Preferably, the third sensor is located close to the opening end surface of the ipsilateral branch.

[0016] Preferably, the restraint rod is located on the inner side of the contralateral branch and is inserted into the gap between the covering membrane and the stent.

[0017] Preferably, a sensor is provided at the distal end of the outer sheath tube for locating the distal opening position of the outer sheath tube.

[0018] Preferably, the sensor of the outer sheath tube is a hollow sensor or a thin-walled sensor.

[0019] Preferably, the origin of the local coordinate system of the sensor of the outer sheath is set at the center of the opening plane of the distal end of the outer sheath.

[0020] The abdominal aorta stent system provided by the present invention has the following advantages compared with the prior art:

[0021] (1) The abdominal aorta stent system of the present invention mainly realizes three functions: first, the sensor and the coated stent are separable, which solves the problem that the implant cannot support long-term connection with cables outside the body; second, in a limited space, sensors are arranged to locate the stent opening, and position sensors are arranged at multiple characteristic positions to realize three-dimensional reconstruction of flexible objects; third, the release degree of the stent can be detected in real time.

[0022] (2) The abdominal aorta stent system of the present invention fixes the characteristic positions of the sensor and the stent, and locates the characteristic positions of the stent after the stent is delivered into the body, so that the coated stent can be imaged in a three-dimensional system. These characteristic positions are used to simulate and generate an image of the stent, which is used to locate the stent and determine the corresponding positions of other devices and the stent.

[0023] (3) The abdominal aorta stent system of the present invention can accurately position the device, eliminate the inaccurate plane positioning under radiation, and save a lot of operation time, reduce the radiation dose during the operation, and reduce the difficulty of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the layout of the positioning sensor in the present invention.

[0025] Figure 2 It is a schematic diagram of the structure of the coated stent in the present invention.

[0026] Figure 3 It is a three-dimensional reconstruction of the present invention.

[0027] Figure 4 It is a simulation diagram of the main support when the present invention is applied and implemented.

[0028] Figure 5 It is a simulation diagram of the contralateral butt iliac support when the present invention is applied and implemented.

[0029] Figure 6 It is a simulation diagram of the grafting of the same side branch when the present invention is applied and implemented.

[0030] Figure 7It is a schematic diagram of the outer sheath sensor of the present invention.

[0031] Figure 8 It is a schematic diagram of the use status of the outer sheath tube sensor of the present invention.

[0032] Description of the numbers in the figure:

[0033] 1. Stent body; 11. Bare stent; 12. Stent body opening; 13. Contralateral branch; 13a. Contralateral branch opening; 14. Ipsilateral branch; 14a. Ipsilateral branch opening; 2. Outer sheath; 2a. Distal opening of the outer sheath; 2b. Thin-walled sensor; 3. First sensor; 4. Constraint rod; 4a. Second sensor; 5. Center rod; 6. Third sensor. DETAILED DESCRIPTION

[0034] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0035] like Figures 1 to 8 As shown, the delivery system includes an outer sheath tube 2, a central rod 5 and a restraining rod 4. The outer sheath tube 2 is sleeved outside the central rod 5. The outer sheath tube 2 and the central rod 5 of the delivery system adopt the same structure as the prior art. The present invention adds a restraining rod 4. Figure 2 As shown, the stent used for the abdominal aorta is a covered stent, which includes a stent body 1, a bare stent 11, a contralateral branch 13 and an ipsilateral branch 14, wherein the contralateral branch 13 and the ipsilateral branch 14 are respectively connected to the stent body 1, and the bare stent 11 can be released or retracted. The covered stent in this embodiment adopts the existing covered stent, and the structure is not changed. During transportation, the central rod 5 passes through the ipsilateral branch 14 and the stent body 1, and the restraining rod 4 passes through the contralateral branch 13 and the stent body 1. Furthermore, the restraining rod 4 is inserted into the gap between the coating and the stent, and one end of the restraining rod 4 is located in the contralateral branch, so that the restraining rod 4 can only move in the axial direction or rotate around the central axis of the restraining rod 4 itself.

[0036] The abdominal aorta stent system of the present invention collects data through sensors, which are three magnetic positioning sensors set in the delivery system, for three-dimensional reconstruction of the stent. The three-dimensional reconstruction is actually based on the position detection of the three sensors, and the positions of the three openings in the aorta can be obtained. Then, combined with the known diameter of the opening and the shape of the aorta, the three-dimensional reconstruction can be performed in the existing imaging system.

[0037] For the convenience of explanation, the three sensors are set as the first sensor 3, the second sensor 4a and the third sensor 6. The first sensor 3 is arranged on the central rod 5, located in the stent body 1 and at the connection plane between the stent body 1 and the bare stent 11, or near the opening of the stent body 1, and is used to locate the position of the distal opening of the coated stent. The second sensor 4a is arranged on the constraint rod 4, located in the contralateral branch and near the contralateral branch opening 13a. The constraint rod 4 extends into the contralateral branch opening 13a and relatively fixes the contralateral branch 13 during the release process. The connection method between the constraint rod 4 and the coated stent is generally to insert the constraint rod 4 into the gap between the stent structure and the coating before loading the coated stent. During the operation, the coated stent is gradually released until the contralateral branch 13 is released from the outer sheath 2. The second sensor 4a is fixed near the contralateral branch opening 13a, and the six-degree-of-freedom magnetic positioning information collected by the second sensor 4a is used to restore the position of the opening through the existing positioning system. The third sensor 6 is disposed on the central rod 5, located inside the ipsilateral branch 14 and at the opening plane of the ipsilateral branch 14, and is used to locate the position of the ipsilateral branch opening 14a. In other embodiments, the third sensor may also be located outside the ipsilateral branch, and only needs to be located near the ipsilateral branch opening, but must be on the central axis of the ipsilateral branch.

[0038] In this embodiment, preferably, the instruments required for the operation can be equipped with magnetic positioning sensors of the same type as those described above, so that when the instruments enter the contralateral branch opening 13a, the relative position of the instruments and the contralateral branch opening 13a can be accurately located in combination with the three magnetic positioning sensors described above. The position where the sensor is installed on the instrument is preferably the end when the instrument first enters the contralateral branch 13. To release the contralateral branch 13, the contralateral branch 13 can be detached by simply pulling back the restraining rod 4. The method of releasing other positions is consistent with the operation method of the traditional coated stent, and the stent can be separated from the delivery system by further releasing the stent.

[0039] The abdominal aorta stent system of the present invention, according to the structural characteristics of the coated stent itself, before being fully released, the first sensor 3 is located near the opening of the stent body 1 and is located on the central axis of the opening, the third sensor 6 is located near the opening 14a of the ipsilateral branch and is located on the central axis of the opening, and the second sensor 4a is pressed against the inner side of the opening 13a of the contralateral branch, and the inner side is the direction close to the ipsilateral branch 14.

[0040] The abdominal aorta stent system of the present invention has the following specific operation method:

[0041] Before the stent graft is released, the entire stent graft is in a completely constrained state, and the entire stent graft collapses and contracts toward the axis of the central rod 5. At this time, the position data collected by the first sensor 3, the second sensor 4a, and the third sensor 6 are used to obtain the direction of the connection line between the contralateral branch 13 and the ipsilateral branch 14, thereby completing the three-dimensional reconstruction of the stent.

[0042] When the coated stent is gradually released to the contralateral branch 13, since the third sensor 6 is fixed on the inner side of the contralateral branch 13, the center of the contralateral branch opening 13a is consistent with the coordinates in the local coordinate system of the third sensor 6 before the stent is loaded. In other words, the ipsilateral branch and the contralateral branch are integrated with the stent body, and when loaded, they are folded into a small diameter state at the same time, which is equivalent to shrinking the cavity in the unfolded state of the stent to no cavity as much as possible. Therefore, it is only necessary to calibrate the center position coordinates of the contralateral branch opening 13a before loading, and obtain the posture information of the contralateral branch 13.

[0043] When the contralateral branch 13 is released during surgery, the center position of the contralateral branch opening 13a can be inferred through the position of the sensor, and then the circle of the contralateral branch opening 13a can be reconstructed through the diameter of the contralateral branch opening 13a.

[0044] Since the first sensor 3 and the third sensor 6 are always located on the central axis of the corresponding plane, it is only necessary to determine the relative position of the center of the corresponding plane and the sensor center, as well as the diameter of the corresponding plane before surgery to reconstruct the circle of the stent main body opening and the ipsilateral branch opening 14a.

[0045] By reconstructing the three open circles and matching the three-dimensional model of the stent in the tracking method in the prior art, the three-dimensional reconstruction of the stent can be completed.

[0046] The abdominal aorta stent system of the present invention, during three-dimensional reconstruction, when it is necessary to deliver the instrument into the contralateral branch 13, the coated stent is released until the contralateral branch 13 is just opened, and the restraint rod 4 can well restrain the contralateral branch 13, and the opening of the contralateral branch 13 is accurately positioned and stable in the corresponding channel. At this time, an instrument equipped with a magnetic positioning sensor is selected, such as a guide wire or a catheter. The magnetic positioning sensor in the instrument can display the precise position information of the instrument, and the relative position of the instrument and the contralateral branch opening 13a can accurately and quickly deliver the instrument to the contralateral branch opening 13a.

[0047] Furthermore, if Figure 7 and Figure 8As shown, in order to better simulate the degree of stent release and facilitate the operation during surgery, the abdominal aorta stent system of the present invention is provided with a sensor at the distal end of the outer sheath tube 2, preferably a hollow sensor or a thin-walled sensor 2b, which is used to locate the position of the distal opening 2a of the outer sheath tube, so the origin of the local coordinate system of the sensor is preferably set at the center of the distal opening plane. The degree of stent release is judged by the relative position of the outer sheath tube and the stent. The degree of release of the stent can be judged by the relative position of the opening of the outer sheath tube 2 and the opening 12 of the main body of the coated stent (i.e., the position of the first sensor 3). The bending shape and position of the coated stent can be obtained by the detection data of the first sensor 3, the second sensor 4a, and the third sensor 6. Combined with the position of the opening of the outer sheath tube 2, the proximal direction of the coated stent can be collapsed to know the state of release of the coated stent. It can be seen from the constraint relationship between the outer sheath tube 2 and the stent subject 1 that the stent part located inside the outer sheath tube is in a collapsed state during the operation, and the stent part located outside the outer sheath tube is in a free expansion state.

[0048] Specifically, the first sensor 3 and the third sensor 6 use 5-degree-of-freedom or 6-degree-of-freedom sensors, and the second sensor 4a uses a 6-degree-of-freedom sensor. The opening position and direction are obtained by three sensors, and two spline lines can be obtained. The two spline lines are the spline of the first sensor 3 and the second sensor 4a, and the spline of the first sensor 3 and the third sensor 6. The spline is a curve and is used as the skeleton of the stent. Through the skeleton and the three-dimensional graph obtained when the coated stent is made, the shape of the coated stent can be obtained in the magnetic field coordinate system.

[0049] In this embodiment, the shape and position of the stent can be drawn through the detection data of the first sensor 3, the second sensor 4a, and the third sensor 6. By comparing the relative positions of the stent body 1 and the outer sheath 2 in the three-dimensional diagram, it is only necessary to collapse the part of the stent body 1 located at the proximal end of the distal opening 2a of the outer sheath to the size of the inner diameter of the outer sheath, and make a natural transition connection between the collapsed section and the non-collapsed section, so that the real-time stent release degree can be drawn.

[0050] Similarly, when the distal opening 2a of the outer sheath is located at the distal end of the stent, it means that the stent is completely located in the outer sheath, and the stent should be completely collapsed to the size of the inner diameter of the outer sheath; when the distal opening 2a of the outer sheath is located at the proximal end of the stent, it means that the stent is completely released from the outer sheath, and all collapse of the stent should be eliminated.

[0051] The abdominal aorta stent system of the present invention has a positioning target of a coated stent, which is a flexible object and is more complicated to perform three-dimensional reconstruction than a rigid object. The details are as follows:

[0052] (1) First, the stent graft is deformable, and the shape of the entire stent cannot be inferred from the position information of a single point.

[0053] (2) Secondly, the sensor cannot be rigidly connected to the stent graft. Since the stent graft is an implant, there are currently no wireless sensors that can be implanted. The design also does not allow for the implantation of accessories other than those that fulfill the function of the stent graft into the human body.

[0054] In order to solve the above problems, the research principles of the present invention are as follows:

[0055] The three opening positions with the most clinical value or the most important in the operation are selected for precise positioning, namely the opening of the stent body, the opening of the contralateral branch 13a and the opening of the ipsilateral branch 14a; the position of the stent body is supplemented by an algorithm. Therefore, a major problem that needs to be solved is how to achieve a temporary and stable connection between the sensor and the coated stent, and a structure that can be quickly separated from the stent after release.

[0056] In the present invention, the first sensor 3 and the third sensor 6 are fixed to the central rod 5 and have no direct connection with the coated stent. The coated stent is constrained to be coaxial with the central rod 5 by loading the central rod to achieve positioning. After the coated stent is completely released, the stent can no longer be positioned.

[0057] In the present invention, the second sensor 4a is arranged on the restraining rod 4 to locate the side branch opening. According to the monitoring data of the second sensor 4a, a method of limiting the degree of stent release can be adopted. Not only does the second sensor 4a and the side branch opening have a stable positional relationship, this arrangement method also has the following advantages:

[0058] 1) The second sensor 4a can be quickly separated from the bracket;

[0059] 2) Constrain the opening of the contralateral branch to prevent it from swinging under the impact of blood flow;

[0060] 3) Release the collateral opening (e.g. Figure 2 State), the second sensor 4a is on the side of the contralateral branch opening close to the ipsilateral branch 14, and does not affect other instruments entering the contralateral branch 13;

[0061] 4) In the limited space of the conveying system, the opening position of the stent can be accurately located by a sensor.

[0062] To further explain, before the operation, the patient will generally wear a patch to do a CT scan. The patch is a positioning electrode patch that is attached to the key anatomical part. The positioning electrode patch has a development mark. The CT data is then imported into the existing three-dimensional system. The patient goes on the table, adjusts the body position, and aligns the CT. Then, the abdominal aorta can be reconstructed in the three-dimensional system. The magnetic positioning sensor in the present invention is combined with the development mark of CT (at least DSA development is required), so that the electrode patch can be positioned in the magnetic field and has obvious identifiable features in CT. Figure 3As shown, according to the position of the positioning electrode in the magnetic field, the electrode position in the CT three-dimensional image is aligned, the position of the abdominal aorta in the magnetic field and the three-dimensional image are simulated, and the movement of the surface electrodes is monitored to correct the spatial position of the abdominal aorta three-dimensional model in real time.

[0063] To further illustrate, the three-dimensional reconstruction process of this application is as follows:

[0064] (1) Release the main support

[0065] a. Establishing access

[0066] Femoral artery puncture in both legs;

[0067] A soft guidewire was inserted under left fluoroscopy, and an angiography catheter was inserted along the guidewire under magnetic navigation.

[0068] Under electrical navigation, a super-stiff guidewire was inserted into the aortic arch on the right side.

[0069] b. First angiography

[0070] A contrast catheter was placed on the contralateral side, and intravascular contrast was performed to determine the exact location of the renal artery branches and correct the CT fusion accuracy.

[0071] c. Insertion into the delivery system

[0072] The stent delivery system is inserted and, under three-dimensional guidance, the stent coating edge is placed at the renal artery branch and the position is confirmed by a sensor.

[0073] d. Release the bracket

[0074] Under the guidance of three-dimensional, part of the main support is released, such as Figure 4 As shown, the bare stent head end and the ipsilateral bifurcation leg are retained and not released, and the stent shape is simulated in the three-dimensional system.

[0075] (2) Contralateral iliac stent docking

[0076] a. Guide wire into the contralateral leg

[0077] like Figure 5 As shown, under three-dimensional guidance, the magnetic positioning adjustable sheath and guidewire are manipulated to advance the guidewire into the contralateral branch, and the angiography catheter is inserted for angiography confirmation.

[0078] b. Insertion of iliac stent delivery system

[0079] The adjustable sheath and angiographic catheter were removed from the contralateral side, and the iliac stent delivery system was inserted into the contralateral side.

[0080] c. Release the bracket

[0081] Under the guidance of 3D, the stent release position is located. The position of the iliac stent and the bifurcation of the main stent are accurately displayed in 3D.

[0082] Remove the sensor of the contralateral branch of the main stent and complete the release of the iliac stent (use X-ray to assist in determining the position of the internal iliac stent if necessary). Complete the secondary release of the main bare stent.

[0083] (3) Ipsilateral branch grafting

[0084] a. Withdraw the main stent delivery system, record the withdrawal path in three dimensions, and confirm the opening position of the ipsilateral branch based on the stent size or radiographic fluoroscopy.

[0085] b. Insert the ipsilateral iliac stent delivery system.

[0086] c. Completely release the iliac stent. Under three-dimensional guidance, locate the stent release position and completely release the contralateral iliac stent.

[0087] The above implementation cases are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, they are not intended to limit the present invention. Therefore, any simple modification, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. An abdominal aorta stent system, comprising a stent graft and a delivery system, characterized in that: It also includes a positioning sensor, the coated stent includes a stent body, a contralateral branch and an ipsilateral branch, the contralateral branch and the ipsilateral branch are respectively connected to the proximal end of the stent body, and the contralateral branch and the ipsilateral branch are located at the proximal end of the stent body; the delivery system includes an outer sheath tube and a central rod, the outer sheath tube is sleeved outside the central rod, and the delivery system is also provided with a constraint rod; the coated stent also includes a bare stent, one end of the bare stent is fixed to the distal opening of the stent body, and the bare stent can be released or retracted; during delivery, the central rod passes through the ipsilateral branch and the stent body, and the distal end of the constraint rod is located in the contralateral branch; the positioning sensor positions the coated stent for three-dimensional reconstruction of the coated stent; the positioning sensors are provided with three, including a first sensor, a second sensor and a third sensor, the first sensor is arranged on the central rod and located at the connection plane between the stent body and the bare stent, and is used to locate the position of the distal opening of the coated stent; the second sensor is arranged on the constraint rod, and is used to locate the position of the opening of the contralateral branch; the third sensor is arranged on the central rod, and is used to locate the position of the opening of the ipsilateral branch; When the stent system is in use, before the stent graft is released, the stent graft collapses and contracts toward the axis of the central rod, and the direction of the connection line between the contralateral branch and the ipsilateral branch is obtained through the data collected by the first sensor, the second sensor, and the third sensor, thereby completing the three-dimensional reconstruction of the stent graft; Before loading, the coordinates of the center position of the contralateral branch opening are calibrated. When the stent graft is gradually released to the contralateral branch, the center position of the contralateral branch opening is obtained to reconstruct the circle of the contralateral branch opening. The second sensor is located in the contralateral branch and close to the opening end surface of the contralateral branch; The third sensor is located near the opening end surface of the ipsilateral branch; The restraining rod is located on the inner side of the contralateral branch and is inserted into the gap between the covering membrane and the stent.

2. The abdominal aorta stent system according to claim 1, characterized in that: A sensor is provided at the distal end of the outer sheath tube for locating the distal opening position of the outer sheath tube.

3. The abdominal aorta stent system according to claim 2, characterized in that: The sensor of the outer sheath tube is a hollow sensor or a thin-wall sensor.

4. The abdominal aorta stent system according to claim 3, characterized in that: The origin of the local coordinate system of the sensor of the outer sheath tube is set at the center of the opening plane of the distal end of the outer sheath tube.

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