Abdominal aorta graft recovery device

Abstract

The invention relates to the technical field of medical instruments, in particular to an abdominal aorta graft recovery device which comprises a circular-tube-shaped supporting catheter, a sliding base is movably installed in the supporting catheter in the axial direction, a plurality of extension rods are fixedly installed on one side of the sliding base, and the extension rods are evenly arranged around the axis of the supporting catheter at intervals. The ends, far away from the sliding seat, of all the extension rods are jointly and fixedly mounted on an annular net-shaped structure used for wrapping the aortic graft, and the annular net-shaped structure can elastically stretch out and draw back in the circumferential direction; the barbs on the infected stent are gradually separated from the blood vessel through rotation of the metal wire, after the metal wire wraps the infected stent, the push rod is pulled back, the metal wire wraps the infected stent, cohesion is achieved, the metal wire is collected into the supporting catheter, and recovery of the infected stent is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an abdominal aorta graft recovery device. Background Art

[0002] Aortic endograft infection (AEI) is a rare but life-threatening complication after endovascular aortic repair (EVAR). Its clinical manifestations can range from mild symptoms such as general weakness and mild fever to severe complications such as fatal aortic rupture or sepsis. The incidence of AEI is low, occurring in approximately 0.6% of EVAR patients, but with the advancement of endovascular treatment technology, its frequency has increased significantly in recent years.

[0003] Surgical removal of infected stents is the mainstay of treatment for AEI, effectively preventing aortic rupture or recurrent infection. However, this procedure is technically challenging, particularly when removing stents secured with suprarenal metal barbs, which can pose a risk of aortic injury. Currently, no standardized device specifically for graft infection is clinically available, making it difficult to meet the diverse surgical requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide an abdominal aortic graft retrieval device to fill the gap in existing clinical treatment and meet clinical needs, ensure the safety of stent graft removal, prevent aortic wall damage, and solve the defects mentioned in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A device for recovering an abdominal aortic graft comprises a tubular support catheter, in which a slide is movably installed axially inside the support catheter, and a plurality of extension rods arranged in a cone shape are fixedly installed on one side of the slide, and the plurality of extension rods are evenly spaced around the axis of the support catheter, and all of the extension rods are fixedly installed at one end away from the slide on an annular mesh structure for covering the aortic graft, and the annular mesh structure can be elastically expanded and contracted circumferentially; when the end of the extension rod away from the slide extends out of the support catheter, the end of the extension rod extending out of the support catheter bends and opens in a direction away from the axis of the support catheter, and the annular mesh structure stretches circumferentially; when the end of the extension rod away from the slide is retracted into the interior of the support catheter, the ends of the plurality of extension rods gather in a direction close to the axis of the support catheter and drive the annular mesh structure to shrink circumferentially.

[0006] As a preferred technical solution, the extension rod is made of elastic steel sheet.

[0007] As a preferred technical solution, the annular mesh structure includes an annular metal wire, the metal wire has a sinusoidal wave structure, and the end of the extension rod is fixedly connected to the wave crest of the metal wire.

[0008] As a further improvement, a push rod is fixedly mounted on the side of the slide seat facing away from the extension rod, and the push rod is coaxially arranged with the support guide tube.

[0009] As a further improvement, a mounting seat is fixedly mounted on one end of the support tube, a through hole is provided on the mounting seat for the push rod to pass through, and a handle is fixedly mounted on one side of the mounting seat.

[0010] As a further improvement, the push rod is provided with an external thread, and two half nuts matching the external thread of the push rod are installed in the mounting seat along the radial sliding direction of the push rod, a separation spring is connected between the two half nuts, and an adjusting component is provided in the mounting seat for driving the two half nuts to approach each other and tightly hold the push rod.

[0011] As a preferred technical solution, the adjusting component includes an adjusting seat that is slidably installed in the mounting seat along the axial direction of the push rod, and a wedge block corresponding to the half nut is fixedly installed on the side of the adjusting seat close to the half nut, and the two half nuts are respectively provided with a bevel surface matching the corresponding wedge block. When the adjusting seat approaches the two half nuts along the axial direction of the push rod, the two wedge blocks respectively contact the corresponding bevel surfaces and push the two half nuts closer to each other; a support spring is also provided in the mounting seat for pushing the adjusting seat away from the two half nuts.

[0012] As a further improvement, a dial handle with one end extending outward from the mounting seat is fixedly mounted on one side of the adjustment seat, and the dial handle and the handle are located on the same side of the mounting seat.

[0013] As a further improvement, a threaded column is threadedly connected to the mounting seat for pushing the adjustment seat close to the two half nuts, and when the threaded column is rotated, the threaded column is driven to move axially along the push rod.

[0014] As a further improvement, a movable sleeve is installed on the outside of the support catheter along its axial sliding direction. When the annular mesh structure extends out of the support catheter and covers the aortic graft, the movable sleeve is slid to retract the annular mesh structure and the aortic graft into the movable sleeve.

[0015] As a further improvement, a strip-shaped protrusion extending along the axial direction thereof is provided on the outer wall of the supporting conduit, and a sliding groove matching the strip-shaped protrusion is provided on the inner wall of the movable sleeve.

[0016] As a further improvement, an adjustment sleeve is rotatably installed on the outer side of the support tube, and a receiving groove for the movable sleeve to enter is provided between one end of the adjustment sleeve and the outer wall of the support tube. A spiral adjustment groove is provided on the outer wall of the movable sleeve, and a sliding column matching the adjustment groove is fixedly installed on the inner wall of the receiving groove.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. This application gradually separates the barbs on the infected stent from the blood vessel by rotating the metal wire. After the metal wire covers the infected stent, the push rod is pulled back, and the metal wire-covered infected stent is gathered and retracted into the support catheter, thereby recovering the infected stent. This can achieve safe and effective removal of the infected stent in clinical applications, reduce surgical risks, minimize damage to blood vessels, and improve the patient's postoperative recovery quality. 2. In this application, the two half nuts are brought close to each other to hold the push rod tightly. When the push rod is rotated, the metal wire is driven to separate the barbs on the infected stent from the blood vessel. At the same time, the threaded relationship between the push rod and the two half nuts enables the push rod to move axially slowly, thereby achieving the push rod driving the metal wire to move slowly to gradually cover the infected stent. This can prevent the operator from pushing the push rod too much, causing the barbs on the infected stent to separate from the blood vessel too quickly and causing damage to the blood vessel. 3. In the present application, after the metal wire is released outside the supporting catheter and covers the infected stent, the lower end of the movable sleeve is driven to extend from the bottom of the supporting catheter by rotating the adjusting sleeve, so that the metal wire and the infected stent are retracted into the movable sleeve. Then, the supporting catheter and the movable sleeve can be removed from the abdominal aorta as a whole, and the recovery of the infected stent is more efficient and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a structural diagram of embodiment 1 of the present invention; Figure 2 1 is a schematic diagram of the structure inside the supporting conduit according to the first embodiment of the present invention; Figure 3 1 is a schematic structural diagram of a metal wire according to a first embodiment of the present invention; Figure 4 This is a schematic diagram of the metal wire wrapped infected stent according to the first embodiment of the present invention; Figure 5is a structural diagram of embodiment 2 of the present invention; Figure 6 1 is a schematic diagram of the internal structure of the mounting base according to the second embodiment of the present invention; Figure 7 yes Figure 6 Explosion diagram of Figure 8 1 is a schematic structural diagram of an adjusting seat and a half nut according to a second embodiment of the present invention; Figure 9 is a structural diagram of embodiment 3 of the present invention; Figure 10 It is an explosion diagram of the third embodiment of the present invention.

[0020] In the figure: 1-support catheter; 2-mounting seat; 3-round groove; 4-handle; 5-slide seat; 6-push rod; 7-through hole; 8-extension rod; 9-metal wire; 10-mounting cavity; 11-slide groove; 12-half nut; 13-guide ridge; 14-guide groove; 15-separation spring; 16-adjustment seat; 17-wedge block; 18-mitered surface; 19-support spring; 20-handle; 21-threaded sleeve; 22-threaded column; 23-infection bracket; 24-movable sleeve; 25-bar protrusion; 26-slide groove; 27-adjustment sleeve; 28-retaining ring; 29-annular groove; 30-storage groove; 31-adjustment groove; 32-slide column. DETAILED DESCRIPTION

[0021] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] Example 1: like Figures 1 to 4 As shown, an abdominal aorta graft recovery device includes a support catheter 1, which is in the shape of a circular tube with its axis extending vertically. A mounting seat 2 is fixedly installed on the upper end of the support catheter 1. The mounting seat 2 is in the shape of a cylinder coaxially arranged with the support catheter 1. A circular groove 3 matching the upper end of the support catheter 1 is provided at the bottom of the mounting seat 2. The upper end of the support catheter 1 is threadedly connected or fixed in the circular groove 3 by screws. A handle 4 is integrally formed on one side of the mounting seat 2 for easy holding.

[0023] like Figure 2As shown, a slide 5 is installed in the supporting conduit 1 along the axial vertical movement. The slide 5 is circular and fits the inner wall of the supporting conduit 1. A push rod 6 is threadedly connected or fixed on the upper side of the slide 5 by screws. The push rod 6 is coaxially arranged with the supporting conduit 1. A through hole 7 for the push rod 6 to pass through is provided on the mounting seat 2. The push rod 6 is arranged to facilitate the movement of the slide 5.

[0024] A plurality of extension rods 8 arranged in a frustum shape are welded to the lower side of the slide 5. The lower ends of the extension rods 8 are tilted away from the axis of the supporting catheter 1. The plurality of extension rods 8 are evenly spaced around the axis of the supporting catheter 1. In this embodiment, the material of the extension rods 8 is elastic steel sheet. The lower ends of all the extension rods 8 are fixedly mounted on the annular mesh structure used to cover the aortic graft. The annular mesh structure can be elastically expanded and contracted in the circumferential direction.

[0025] In this embodiment, the annular mesh structure includes an annular metal wire 9, such as Figure 3 As shown, the metal wire 9 has a sinusoidal wave structure, and the metal wire 9 at the crest and the metal wire 9 at the trough are staggered along the axial direction of the support catheter 1 respectively. The number of extension rods 8 is consistent with the number of crests of the metal wire 9, and the lower end of the extension rod 8 is welded to the crest of the metal wire 9.

[0026] In this embodiment, when the lower end of the extension rod 8 extends out of the outside of the support catheter 1, the lower ends of the multiple extension rods 8 bend and open in a direction away from the axis of the support catheter 1, and at the same time, the metal wire 9 stretches circumferentially, and the diameter of the circle enclosed by the metal wire 9 expands, so that the metal wire 9 can better adhere to the blood vessel wall and cover the infected stent 23; when the lower end of the extension rod 8 is retracted into the interior of the support catheter 1, the inner wall of the support catheter 1 contacts the extension rod 8, so that the lower ends of the multiple extension rods 8 gather in a direction close to the axis of the support catheter 1, and then the multiple extension rods 8 drive the metal wire 9 to shrink circumferentially, and the metal wire 9 covers the infected stent 23 and is retracted into the support catheter 1. In addition, a tapered opening with a smaller diameter at the upper end and a larger diameter at the lower end is provided in the lower end of the support catheter 1, so that the extension rod 8 and the metal wire 9 covering the infected stent 23 can be better guided inward.

[0027] The abdominal aorta graft infected stent removal device of the present invention is designed to achieve safe and effective removal of the infected stent 23 through a series of precise operating steps. The following are detailed operating steps and precautions: The patient's abdominal aorta is incised, and the lower end of the support catheter 1 is inserted into the abdominal aorta; the handle 4 is used to adjust the position of the device, and the support catheter 1 is advanced along the abdominal aorta to the tail of the infected stent 23; the push rod 6 is pushed to drive the slide 5 and the extension rod 8 to move axially along the support catheter 1, so that the metal wire 9 is released to the outside of the support catheter 1, and the metal wire 9 is stretched circumferentially to adhere to the blood vessel wall and wrapped around one end of the infected stent 23; the operator rotates the push rod 6 to drive the metal wire 9 to rotate, and the rotation of the metal wire 9 gradually realizes the separation of the barbs on the infected stent 23 and the blood vessel, and at the same time, the operator slowly pushes the push rod 6 so that the metal wire 9 gradually covers the infected stent 23; finally, the operator pulls back the push rod 6, and under the guidance of the extension rod 8, the metal wire 9 covers the infected stent 23 and is retracted into the support catheter 1, thereby realizing the recovery of the infected stent 23.

[0028] Through the above-mentioned operation steps, the abdominal aorta graft infected stent removal device of the present invention can realize safe and effective removal of the infected stent 23 in clinical applications, reduce surgical risks, minimize damage to blood vessels, and improve the patient's postoperative recovery quality.

[0029] Example 2: like Figures 5 to 8 As shown, the difference between this embodiment and the first embodiment is that the push rod 6 is provided with an external thread, the top of the mounting seat 2 is coaxially provided with a circular mounting cavity 10, the bottom wall of the mounting cavity 10 is provided with a slide groove 11 extending radially along the push rod 6, the through hole 7 together with the top wall of the circular groove 3 and the bottom wall of the slide groove 11, and two half nuts 12 matching the external threads of the push rod 6 are slidably installed in the mounting cavity 10, and the two half nuts 12 are respectively located on opposite sides of the push rod 6. In this embodiment, guide ridges 13 are integrally formed on the inner walls of the mounting cavity 10 on both sides along the width, and the guide ridges 13 extend along the length direction of the slide groove 11. The two half nuts 12 are each provided with a guide groove 14 matching the guide ridges 13 to prevent the half nuts 12 from moving up and down in the slide groove 11.

[0030] A separation spring 15 is connected between the two half nuts 12, and an adjusting component is provided in the mounting seat 2 for driving the two half nuts 12 to move closer to each other and hold the push rod 6. Figure 6As shown, when there is no external force, the thrust of the separation spring 15 drives the two half nuts 12 to move to the two ends of the slide groove 11 respectively, so that the two half nuts 12 loosen the push rod 6. At this time, the operator can freely push or pull back the push rod 6 to quickly adjust the position of the metal wire 9; when the metal wire 9 is released to the outside of the supporting catheter 1 and wrapped around one end of the infected bracket 23, the adjusting component can be adjusted to make the two half nuts 12 close to each other and clamp the push rod 6, thereby limiting the free axial movement of the push rod 6. At this time, the operator rotates the push rod 6 to drive the metal wire 9 to rotate. While the metal wire 9 separates the barbs on the infected bracket 23 from the blood vessel, the threaded relationship between the push rod 6 and the two half nuts 12 causes the push rod 6 to move slowly axially, thereby realizing that the push rod 6 drives the metal wire 9 to move slowly to gradually cover the infected bracket 23, which can avoid the operator pushing the push rod 6 too much, causing the barbs on the infected bracket 23 to separate from the blood vessel too quickly and causing damage to the blood vessel.

[0031] In this embodiment, the adjustment component includes an adjustment seat 16 that is slidably mounted in the installation cavity 10 along the axial direction of the push rod 6. The adjustment seat 16 is cylindrical and fits the inner wall of the installation cavity 10. The adjustment seat 16 is provided with a through hole for the push rod 6 to pass through. Figure 7 As shown, a long strip-shaped protrusion extending along its axial direction is integrally formed on the outer peripheral surface of the adjustment seat 16, and a strip groove matching the protrusion on the adjustment seat 16 is provided on the inner wall of the installation cavity 10. The protrusion and the strip groove slide together to improve the stability of the adjustment seat 16 sliding up and down. The bottom of the adjusting seat 16 is integrally formed with a wedge block 17 corresponding to the half nut 12 one by one. The distance between the inner sides of the two wedge blocks 17 gradually decreases from bottom to top. The tops of the ends of the two half nuts 12 that are away from each other are respectively provided with miter surfaces 18 that match the corresponding wedge blocks 17, and the miter surfaces 18 coincide with the inner sides of the lower ends of the corresponding wedge blocks 17. When the two half nuts 12 move to the two ends of the slide groove 11 respectively, the projection of the wedge blocks 17 in the vertical direction completely falls on the corresponding miter surfaces 18, so that when the adjusting seat 16 approaches the two half nuts 12 axially downwardly along the push rod 6, the two wedge blocks 17 respectively contact the corresponding miter surfaces 18 and push the two half nuts 12 closer to each other; a support spring 19 is also provided in the mounting seat 2 for pushing the adjusting seat 16 upward away from the two half nuts 12, the lower end of the support spring 19 abuts the bottom wall of the mounting cavity 10, and the upper end abuts the bottom of the adjusting seat 16.

[0032] like Figure 6As shown, a dial handle 20 is integrally formed on one side of the adjustment seat 16, with one end extending outward from the outside of the mounting seat 2. A strip hole is provided on the side wall of the mounting seat 2 for the dial handle 20 to pass through. The dial handle 20 and the handle 4 are located on the same side of the mounting seat 2, and the dial handle 20 is located above the handle 4. When there is no external force, the thrust of the support spring 19 will push the adjustment seat 16 upward away from the two half nuts 12, and the adjustment seat 16 drives the two wedge blocks 17 to separate from the corresponding miter surfaces 18 respectively, and the wedge blocks 17 have no force on the half nuts 12; when the metal wire 9 is released to the outside of the support catheter 1 and wrapped around one end of the infection bracket 23, the operator can press the dial handle 20 to drive the adjustment seat 16 to move downward, and the adjustment seat 16 drives the wedge block 17 downward to resist the miter surface 18 on the half nut 12 and make the two half nuts 12 close to each other and hold the push rod 6, and then the operator rotates the push rod 6 to achieve the metal wire 9 covering the infection bracket 23; after completing the above operation, the operator releases the dial handle 20, and the thrust of the support spring 19 again separates the wedge block 17 from the miter surface 18, and the operator slowly pulls back the push rod 6 to retract the metal wire 9 and the infection bracket 23 into the support catheter 1.

[0033] In addition to continuously pressing the dial handle 20, this embodiment also provides another method for adjusting the adjustment seat 16. Specifically, a threaded sleeve 21 is fixedly installed in the upper end of the mounting cavity 10 via a screw. A threaded column 22 is threadedly connected to the inner thread of the threaded sleeve 21. The threaded column 22 is located above the adjustment seat 16 and has a central hole for the push rod 6 to pass through. The lower end of the threaded column 22 is integrally formed with an annular stop to prevent it from upwardly disengaging from the threaded sleeve 21. The upper end of the threaded column 22 extends out of the top of the mounting seat 2 and is integrally formed with a knob portion for convenient rotation operation. Specifically, rotating the threaded column 22 clockwise drives it to move axially downward, pushing the adjustment seat 16 downward through the threaded column 22 and causing the wedge block 17 to press downward against the miter surface 18, so that the two half nuts 12 can hold the push rod 6 without continuously pressing the handle 20; conversely, rotating the threaded column 22 counterclockwise drives it to move axially upward, and then the support spring 19 pushes the adjustment seat 16 upward and causes the wedge block 17 to disengage from the miter surface 18, thereby achieving the two half nuts 12 loosening the push rod 6.

[0034] Example 3: like Figure 9 and Figure 10 As shown, on the basis of embodiment 2, a movable sleeve 24 is installed on the outer side of the support conduit 1 along its axial sliding direction, and the lower end of the outer wall of the movable sleeve 24 is provided with a rounded corner, and a strip protrusion 25 extending along its axial direction is integrally formed on the outer wall of the lower end of the support conduit 1. A plurality of strip protrusions 25 are evenly spaced around the support conduit 1 in the circumferential direction, and a sliding groove 26 matching the strip protrusion 25 is provided on the inner wall of the movable sleeve 24 to prevent the movable sleeve 24 from rotating around the support conduit 1.

[0035] An adjusting sleeve 27 is also rotatably installed on the outside of the supporting tube 1. The inner wall of the upper end of the adjusting sleeve 27 fits against the outer wall of the supporting tube 1. An annular retaining ring 28 is integrally formed on the outer wall of the supporting tube 1 located below the mounting seat 2. An annular groove 29 that matches the retaining ring 28 is provided on the inner wall of the upper end of the adjusting sleeve 27, so that the adjusting sleeve 27 can rotate around the supporting tube 1 while preventing the adjusting sleeve 27 from moving axially along the supporting tube 1.

[0036] A receiving groove 30 for the movable sleeve 24 to enter is provided between the lower end of the adjustment sleeve 27 and the outer wall of the support guide tube 1. A spiral adjustment groove 31 is provided on the outer wall of the movable sleeve 24. A sliding post 32 that matches the adjustment groove 31 is embedded in or integrally formed on the inner wall of the receiving groove 30. The sliding post 32 is cylindrical and extends radially along the adjustment sleeve 27. By rotating the adjustment sleeve 27, the sliding post 32 on the adjustment sleeve 27 acts on the adjustment groove 31 on the movable sleeve 24, thereby driving the movable sleeve 24 to move axially along the support guide tube 1.

[0037] In the initial state, the lower end of the movable sleeve 24 does not extend below the support catheter 1. After adjusting the push rod 6 so that the metal wire 9 is released outside the support catheter 1 and covers the infected stent 23, there is no need to pull back the push rod 6. By rotating the adjustment sleeve 27, the movable sleeve 24 is driven to move axially along the support catheter 1, so that the lower end of the movable sleeve 24 extends below the support catheter 1, thereby retracting the metal wire 9 and the infected stent 23 into the movable sleeve 24. Then, the support catheter 1 and the movable sleeve 24 can be removed from the abdominal aorta as a whole, making the recovery of the infected stent 23 more efficient and safe.

[0038] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An abdominal aorta graft retrieval device, characterized by: The invention comprises a cylindrical support conduit, wherein a slide is movably mounted in the axial direction inside the support conduit, and a plurality of extension rods arranged in a frustum shape are fixedly mounted on one side of the slide. The plurality of extension rods are evenly spaced around the axis of the support conduit, and the ends of all the extension rods away from the slide are fixedly mounted on an annular mesh structure for covering the aortic graft, and the annular mesh structure is elastically retractable in the circumferential direction; when the ends of the extension rods away from the slide extend out of the support conduit, the ends of the extension rods extending out of the support conduit bend and expand in a direction away from the axis of the support conduit, and the annular mesh structure simultaneously expands in the circumferential direction; When the end of the extension rod away from the slide seat is retracted into the support tube, the ends of the plurality of extension rods gather in a direction close to the axis of the support tube and drive the annular network structure to shrink circumferentially; A push rod is fixedly mounted on the side of the slide seat facing away from the extension rod, and the push rod is coaxially arranged with the support guide tube; A mounting seat is fixedly mounted on one end of the support guide tube, a through hole is provided on the mounting seat for the push rod to pass through, and a handle is fixedly mounted on one side of the mounting seat; The push rod is provided with an external thread, and two half nuts matching the external thread of the push rod are installed in the mounting seat along the radial sliding direction of the push rod. A separation spring is connected between the two half nuts, and an adjusting component is provided in the mounting seat for driving the two half nuts to approach each other and tightly hold the push rod.

2. The abdominal aorta graft retrieval device according to claim 1, characterized in that: The extension rod is made of elastic steel sheet.

3. The abdominal aorta graft retrieval device according to claim 1, characterized in that: The annular mesh structure includes an annular metal wire, the metal wire is in a sinusoidal wave structure, and the end of the extension rod is fixedly connected to the wave crest of the metal wire.

4. The abdominal aorta graft retrieval device according to claim 1, characterized in that: The adjusting component includes an adjusting seat that is slidably installed in the mounting seat along the axial direction of the push rod, and a wedge block corresponding to the half nut is fixedly installed on the side of the adjusting seat close to the half nut, and the two half nuts are respectively provided with a bevel surface matching the corresponding wedge block. When the adjusting seat approaches the two half nuts along the axial direction of the push rod, the two wedge blocks respectively contact the corresponding bevel surfaces and push the two half nuts closer to each other; a support spring is also provided in the mounting seat for pushing the adjusting seat away from the two half nuts.

5. The abdominal aorta graft retrieval device according to claim 4, characterized in that: A dial handle with one end extending outward from the mounting seat is fixedly mounted on one side of the adjustment seat, and the dial handle and the handle are located on the same side of the mounting seat.

6. The abdominal aorta graft retrieval device according to claim 4, characterized in that: The mounting seat is threadedly connected with a threaded column for pushing the adjustment seat close to the two half nuts. When the threaded column is rotated, the threaded column is driven to move along the axial direction of the push rod.

7. The abdominal aorta graft retrieval device according to claim 1, characterized in that: A movable sleeve is slidably mounted on the outer side of the support catheter along its axial direction. When the annular mesh structure extends out of the support catheter and covers the aortic graft, the movable sleeve is slid to retract the annular mesh structure and the aortic graft into the movable sleeve.

8. The abdominal aorta graft retrieval device according to claim 7, characterized in that: A strip-shaped protrusion extending along the axial direction thereof is provided on the outer wall of the supporting conduit, and a sliding groove matching the strip-shaped protrusion is provided on the inner wall of the movable sleeve.

9. The abdominal aorta graft retrieval device according to claim 7, characterized in that: An adjusting sleeve is also rotatably mounted on the outer side of the supporting tube, and a receiving groove for the movable sleeve to enter is provided between one end of the adjusting sleeve and the outer wall of the supporting tube. A spiral adjusting groove is provided on the outer wall of the movable sleeve, and a sliding column matching the adjusting groove is fixedly mounted on the inner wall of the receiving groove.

Images