Thoracic aorta covered stent capable of being pulled

Abstract

The invention provides a thoracic aorta covered stent capable of being pulled, and relates to the technical field of medical instruments. The tractable thoracic aorta covered stent is characterized in that the tractable thoracic aorta covered stent is composed of a main body, a branch opening and a traction guide wire, and the covered stent is provided with a small bending side area and a large bending side area. The main body comprises an elastic wave-shaped main body stent capable of shrinking in the radial direction and a main body covering film arranged on the inner side of the main body stent; the traction guide wire is arranged in the ring of the main body of the small bend side area of the covered stent in a penetrating manner; the branch openings are formed in a main body of a large bending side area of the covered stent; the invention aims to solve the problem that secondary adjustment cannot be carried out after an existing aorta covered stent is released from a catheter, and provides an aorta covered stent controllable after release, the stent can be semi-released through a traction guide wire after being released from the catheter, and then the covered stent is positioned to a lesion position through a positioning guide wire, so that the stent can be controlled after being released from the catheter. And finally, the traction guide wire is withdrawn, so that the covered stent is completely released.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a stretchable thoracic aorta covered stent. Technical Background

[0002] Thoracic aortic diseases include thoracic aortic aneurysm, aortic dissection and aortic ulcer. The commonly used surgical treatment is aortic replacement, but surgical trauma is relatively large. In 1994, DAKE et al. first reported the use of thoracic endovascular aortic repair (TEVAR) to treat thoracic aortic aneurysm. Chinese clinicians have also begun to perform TEVAR for aortic dissection since the late 1990s. TEVAR has gradually become one of the common methods for treating aortic dissection and aortic aneurysm due to its advantages such as less trauma, short operation time, fewer complications, low mortality and fast postoperative recovery.

[0003] For aortic aneurysms with permanent localized dilatation of the arterial wall or aortic dissection in which blood enters the arterial wall through the intimal rupture and causes separation, TEVAR is performed using a thoracic aortic stent graft. The stent graft is delivered to the target lesion site through a delivery system and released and fixed at the target lesion, thereby isolating the aortic aneurysm cavity or closing the dissection rupture.

[0004] After the existing aortic stent graft is released from the catheter, it will immediately adhere to the blood vessel wall due to the radial support force of the stent graft. At this time, it is difficult to adjust the position of the stent again. Once the implantation position is not ideal, it will cause problems such as blockage of the branch blood vessel pathway, and the consequences are disastrous. Therefore, a controllable aortic stent graft after release is needed to solve this problem. Summary of the invention

[0005] The object of the present invention is to provide a retractable thoracic aortic covered stent, which can be semi-released by pulling a guide wire after being released from a catheter, and then positioned to the lesion by a positioning guide wire, and finally completely released by withdrawing the pulling guide wire.

[0006] A stretchable thoracic aorta covered stent, comprising a main body, a branch opening and a stretching guide wire;

[0007] The main body comprises an elastic corrugated main body support which can be contracted in radial direction and a main body covering film arranged on the inner side of the main body support;

[0008] The main body has a large curved side region and a small curved side region;

[0009] The branch opening is axially arranged on the main body of the greater curvature side area of ​​the stent graft;

[0010] The rings are distributed axially on the main stent in the lesser curvature area of ​​the stent graft;

[0011] One end of the traction guide wire is inserted into the ring of the main stent of the lesser curvature area of ​​the coated stent, and the other end extends to the proximal end of the stent for in vitro traction;

[0012] Preferably, the number of branch openings is 3, corresponding to the brachiocephalic artery branch, the left common carotid artery branch and the left subclavian artery branch respectively;

[0013] Preferably, the branch opening is a hollow structure on the main body coating;

[0014] Preferably, the height of the corrugated body of the stent graft in the greater curvature region is 10 mm to 20 mm, and the height of the corrugated body of the stent graft in the less curvature region is 2 mm to 8 mm;

[0015] Preferably, the ring diameter is 1mm-2mm;

[0016] Preferably, the main stent is made of nickel-titanium alloy wire with a diameter of 0.2-0.8 mm;

[0017] Preferably, the main body covering and the main body support can be sutured or combined by heat pressing or the like;

[0018] Preferably, the main body coating is made of polyethylene terephthalate (PET);

[0019] It has the following significant advantages:

[0020] 1. The main stent adopts an axially asymmetric design, with a high waveform height in the large curve side area and a small waveform height in the small curve side area, which effectively improves the bending ability of the stent graft through the aortic arch, improves the controllability of the main body, and reduces the damage of the stent graft to the aortic wall;

[0021] 2. The use of a pulling guide wire can make the subject reach a semi-released state after being detached from the catheter, thereby increasing the controllability of the subject during implantation, improving the fault tolerance of the operation, ensuring the accuracy of the release position, and reducing surgical risks.

[0022] 3. The design of the branch opening can avoid the blockage of the corresponding branch and also provide a path for the positioning of the main body during the implantation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 is a side view of the present invention;

[0025] Figure 3 It is a front view of the small curved side area of ​​the present invention;

[0026] Figure 4 It is a partial view of the small curved side area of ​​the present invention;

[0027] Figure 5 It is a schematic diagram of the present invention in a semi-release state;

[0028] Figure 6 It is a schematic diagram of the present invention after complete release;

[0029] In the figure: 1 main body, 2 main body stent, 3 main body covering, 4 branch opening, 5 traction guide wire, 6 positioning guide wire, 21 greater curvature side area, 22 lesser curvature side area, 23 ring. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0031] Reference Figure 1 , a retractable thoracic aorta covered stent, comprising a main body (1), a branch opening (4) and a retraction guide wire (5);

[0032] The main body (1) comprises an elastic corrugated main body support (2) which can be contracted in the radial direction and a main body coating (3) arranged on the inner side of the main body support (2);

[0033] Reference Figure 2 , the main body (1) has a large curved side region (21) and a small curved side region (22);

[0034] The branch opening (4) is axially arranged on the main body of the greater curvature side region (21) of the stent graft;

[0035] Reference Figure 3 and Figure 4 The ring (23) is distributed axially on the main stent (2) of the lesser curvature region (22) of the stent graft;

[0036] One end of the traction guide wire (5) is inserted into the ring (23) of the main stent of the lesser curvature region (22) of the stent graft, and the other end extends to the proximal end of the stent for in vitro traction;

[0037] Furthermore, the number of the branch openings (4) is 3, corresponding to the brachiocephalic artery branch, the left common carotid artery branch and the left subclavian artery branch respectively;

[0038] Furthermore, the branch opening (4) is a hollow structure on the main body coating (3);

[0039] Furthermore, the height of the main stent waveform in the greater curved side region (21) of the stent graft is 10mm-20mm, and the height of the main stent waveform in the less curved side region (22) is 2mm-8mm;

[0040] Furthermore, the diameter of the ring (23) is 1 mm to 2 mm;

[0041] Furthermore, the main support (2) is made of nickel-titanium alloy wire with a diameter of 0.2-0.8 mm;

[0042] Furthermore, the main body covering (3) and the main body support (2) can be sutured or combined by heat pressing or the like;

[0043] Furthermore, the main body coating (3) is made of polyethylene terephthalate (PET);

[0044] Reference Figure 5 and Figure 6 The present invention provides a method for implanting a stretchable thoracic aortic stent graft, and the specific steps are as follows:

[0045] Step 1: Load the stent graft into the catheter and deliver it to the lesion site;

[0046] Step 2: Move the catheter from the distal end to the proximal end, and gradually release the main body (1) from the catheter. During the entire process, the tension of the pulling guide wire (5) is maintained, and the main body (1) reaches a semi-released state after it is completely detached from the catheter.

[0047] Step 3: The positioning guide wire (6) passes through the proximal end of the main body (1) and the branch opening (4) to reach the corresponding blood vessel branch, completing the positioning of the main body (1). During this process, the tension of the pulling guide wire (5) is still maintained, and the main body (1) is in a semi-released state. Figure 4 As shown;

[0048] Step 4: The tension of the pulling guide wire (5) is released, the main body (1) is completely released, and is closely attached to the lesion position, and the branch opening (4) is completely aligned with the corresponding blood vessel branch.

[0049] Step 5: Remove the pulling guide wire (5) and the positioning guide wire (6) in sequence, and the implantation of the main body (1) is completed. Figure 6 shown.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. The technicians in the industry should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A stretchable thoracic aortic stent graft, characterized in that: The coated stent comprises a main body, a branch opening and a traction guide wire, and the coated stent has a lesser curved side region and a greater curved side region. The main body comprises an elastic corrugated main body support which can be contracted in radial direction and a main body covering film arranged on the inner side of the main body support; The pulling guide wire is inserted into the loop of the main body of the lesser curvature area of ​​the stent graft; The branch opening is arranged on the main body of the greater curvature side area of ​​the stent graft.

2. The stretchable thoracic aortic stent graft according to claim 1, characterized in that: The main body support of the lesser curvature region of the coated support is provided with at least one ring distributed along the axial direction, with a diameter of 1mm-2mm.

3. The stretchable thoracic aortic stent graft according to claim 2, characterized in that: One end of the traction guide wire is inserted into the ring of the main stent of the lesser curvature area of ​​the coated stent, and the other end extends to the proximal end of the stent for in vitro traction.

4. The stretchable thoracic aortic stent graft according to claim 1, characterized in that: The height of the main stent waveform in the large curved side area of ​​the coated stent is 10mm-20mm, and the height of the main stent waveform in the small curved side area is 2mm-8mm.

5. The stretchable thoracic aortic stent graft according to claim 1, characterized in that: The branch opening is a hollow structure on the main body coating.

6. The stretchable thoracic aortic stent graft according to claim 5, characterized in that: There are three branch openings, namely the brachiocephalic artery branch, the left common carotid artery branch and the left subclavian artery branch.

7. The stretchable thoracic aortic stent graft according to claim 1, characterized in that: The main stent is made of nickel-titanium alloy wire with a diameter of 0.2-0.8mm.

8. The stretchable thoracic aortic stent graft according to claim 1, characterized in that: The main body covering and the main body stent can be combined by sutures or by heat pressing; The stretchable thoracic aortic stent graft according to claim 8, characterized in that: The main body coating is made of polyethylene terephthalate (PET).

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