A tool for measuring the rotation angle of aortic endovascular stent grafts

Abstract

This invention relates to a tool for measuring the rotation angle of an aortic endovascular stent graft, belonging to the field of medical device technology. It includes a first column, a second column, a base, a circular track, and a measuring column. A circular track is provided along the horizontal plane on the base, and a movable first column, perpendicular to the horizontal plane, is positioned on the circular track. A second column, perpendicular to the horizontal plane, is located at the center of a virtual circle containing the circular track. A measuring column is located on the upper surface of the first column, and the central axis of the measuring column intersects perpendicularly with the central axis of the second column. This invention can simulate real-world stent usage scenarios, simulating the connection between the ascending and descending aorta, and accurately measuring the angle of deviation of the marker after bending under stent graft bending conditions, directly obtaining the true bending deviation of the stent. The testing device has a simple structure, is convenient and quick to use, has high simulation accuracy, and provides stable and reliable test results.

Description

Technical Field

[0001] This invention relates to a tool for measuring the rotation angle of an aortic endovascular stent graft, belonging to the field of medical device technology. Background Technology

[0002] Treatment of aortic arch diseases typically requires the use of a cladding stent to completely isolate the lesion. However, the aortic arch gives rise to three important branches that supply blood to the brain and upper limbs. When a disease affects one or more of these branches, the cladding stent needs to cover beyond the lesion to completely isolate it. In this case, while the lesion is isolated, the supra-aortic branch artery may also be blocked, leading to cerebral ischemia. To isolate the lesion while preserving access to the supra-aortic branch artery, a common practice is to pre-create a "window" in the cladding stent. The size of this "window" is similar to the opening of the supra-aortic branch artery to be isolated. This allows for blood flow to the branch artery while covering the lesion. Therefore, the alignment of the window on the cladding stent with the opening of the branch artery becomes crucial. The current method used is the "spatial flipping method." This method involves placing the covered stent into the body with the fenestrated opening facing the feet. Once the stent reaches the aortic arch, taking advantage of the ascending aorta being superficial to the descending aorta, the stent is flipped. After this "flipping," the "window" moves from facing the feet to facing the head, aligning with the opening of the branch artery at the apex of the aorta. However, the ascending aorta is not directly above the descending aorta; it is at an angle, and this angle varies slightly from person to person. This can cause misalignment between the stent "window" and the branch artery opening, but the extent of this misalignment is unknown. Therefore, this technical field urgently needs to solve the problem of how to detect the deviation between the opening of the branch artery above the aorta and the opening of the branch artery above the aorta on the covered stent. Summary of the Invention

[0003] The purpose of this invention is to solve the technical problem of how to detect the deviation between the orifice of the supra-arc branch artery and the orifice of the supra-arc branch artery on a covered stent.

[0004] To address the aforementioned problems, the present invention provides a tool for measuring the rotation angle of an aortic endovascular stent graft, comprising a first column, a second column, a chassis, an annular track, and a measuring column. An annular track is provided on the chassis along a horizontal plane, and a movable first column, perpendicular to the horizontal plane, is positioned on the annular track. A second column, perpendicular to the horizontal plane, is located at the center of a virtual circle containing the annular track. A measuring column is positioned on the upper surface of the first column, and the central axis of the measuring column intersects perpendicularly with the central axis of the second column.

[0005] Preferably, the second column is a truncated cone, the central axis of which is perpendicular to the horizontal plane and passes through the center of the circular track.

[0006] Preferably, a second marking line is provided along the conical generatrix on the outer wall of the second column.

[0007] Preferably, the annular track includes a circular inner ring and a circular outer ring with the same center as the inner ring; the inner ring sidewall and the outer ring sidewall are respectively provided perpendicular to the horizontal plane along the circumference of the inner ring and the outer ring sidewall; a movable track space is provided between the inner ring sidewall and the outer ring sidewall; the outer ring sidewall is provided with a scale.

[0008] Preferably, the first column is a cylinder, and the outer wall of the first column is provided with a marking line, which is parallel to the central axis of the first column.

[0009] Preferably, the measuring column is a cylinder or a truncated cone, with graduations on the circumference of the bottom surface of the cylinder or truncated cone; graduations are also provided on the outer wall of the cylinder or truncated cone.

[0010] Preferably, the second column is fixedly connected to the chassis; the measuring column is fixedly connected to the first column.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] Previously, such deviation angles could be obtained using computer simulations. However, computer simulations require the physical parameters of all stents, such as curvature and material elasticity, and often contain significant errors compared to real materials. Since stents themselves cannot be twisted, the device provided by this invention can simulate and directly measure the actual bending deviation of stents of all brands in a real environment. The device provided by this invention can simulate the connection between the ascending and descending aorta and accurately measure the offset angle of the marker after bending under the condition of a covered stent. The testing device provided by this invention has a simple structure, is convenient and quick to use, has high simulation accuracy, and provides stable and reliable test results. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention.

[0014] Attached diagram labels: 1. Column 1; 2. Column 2; 3. Chassis; 4. Circular track; 5. Measuring column; 6. Covering support; 7. Marking line 3; 8. Marking line 1; 9. Marking line 2; 10. 0-degree line; 11. 180-degree line. Detailed Implementation

[0015] To make the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings:

[0016] like Figure 1As shown, the technical solution adopted by the present invention is to provide a tool for measuring the rotation angle of an aortic endovascular stent graft, including a first column 1, a second column 2, a base 3, an annular track 4, and a measuring column 5; an annular track 4 is provided on the base 3 along a horizontal plane, and a movable first column 1, which can move along the annular track 4, is provided on the annular track 4 perpendicular to the horizontal plane; a second column 2, perpendicular to the horizontal plane, is provided at the center of a virtual circle containing the annular track 4; a measuring column 5 is provided on the upper end face of the first column 1, and the central axis of the measuring column 5 intersects the central axis of the second column 2 perpendicularly. The second column 2 is designed as a truncated cone, and the central axis of the truncated cone is perpendicular to the horizontal plane and passes through the center of the annular track 4. A second marking line 9 is provided along the generatrix of the cone on the outer wall of the second column 2. The circular track 4 includes an inner circular ring and an outer circular ring concentric with the inner ring; the inner and outer rings have side walls perpendicular to the horizontal plane along their circumferences; the space between the inner and outer ring side walls forms a track space for the movement of the column 1; the outer ring side wall has graduations. Column 1 is a cylinder, and its outer wall has a marking line 8 parallel to its central axis. The measuring column 5 is a cylinder or a truncated cone, with graduations on its base circumference; the outer wall of the cylinder or truncated cone also has graduations. Column 2 is fixedly connected to the base 3; the measuring column 5 is fixedly connected to column 1.

[0017] This invention is used to measure how many degrees the pre-set opening on the covered stent leading to the supra-aortic branch artery will be misaligned with the opening of the supra-aortic branch artery when the ascending and descending aortas are at different angles. Obtaining this data can inform the surgeon in advance to allow for advance preparation when making a fenestration on the covered stent.

[0018] Example

[0019] This invention consists of components such as column 1, column 2, chassis 3, circular track 4, and measuring column 5 (e.g., Figure 1 The component base 3 has an annular groove, which is set as an annular track 4. A column 1 is set in the annular track 4. The outer wall of the groove is engraved with degrees. The column 1 is a cylindrical column. A groove line 8 is set on the outer wall of the column 1 from top to bottom perpendicular to the horizontal plane. The column 1 can slide freely in the annular track 4. The groove line 8 on the column 1 corresponds to the scale line on the outer wall of the groove, representing the angle of rotation of the column 1 around the column 2.

[0020] The second column 2 is a conical column set in the center of the annular groove. A scale line 9 is set on the outer wall of the second column 2 along a conical generatrix. The second column 2 is connected to the annular groove through a cross-shaped component. A virtual vertical plane is set that is perpendicular to the horizontal plane and includes the second mark line 9 and the central axis of the second column 2. The two lines intersecting the outer wall of the groove of this vertical plane are set as two scale lines. The scale line closer to the second mark line 9 is set as the 180-degree line 11, and the scale line farther away from the second mark line 9 is set as the 0-degree line 10.

[0021] The upper end of column 1 is connected to measuring column 5. Measuring column 5 is a cylinder, with the upper surface of column 1 set as a horizontal plane. Measuring column 5 is placed horizontally on the upper surface of column 1, and the outer wall of measuring column 5 is fixedly connected to the upper surface of column 1. The bottom surface of measuring column 5 is a circular disk with graduation lines engraved along its circumference. Graduation lines extending from the graduation lines on the bottom disk of measuring column 5 to the side wall are provided. A 0-degree line 10 is provided at the highest point of the bottom disk of measuring column 5, away from the upper surface of column 1.

[0022] When one end (tail end) of the film-coated bracket 6 is tightly fitted onto the conical column 2 (the film-coated bracket 6 has red marking lines 3 and 7 on both ends, and these two red marking lines 3 and 7 are on a straight line parallel to the central axis of the film-coated bracket 6), the film-coated bracket 6 is tightly fitted onto the column 2. The red marking line 3 and 7 at the tail end of the film-coated bracket 6 corresponds to the marking line 2 and 9 engraved on the column 2. This indicates that the red marking line 3 and 7 at the tail end of the film-coated bracket 6 corresponds to the 180-degree line 11 on the outer wall of the groove. At this time, the red marking line 3 and 7 at the head end of the film-coated bracket 6 also corresponds to the 180-degree line 11 on the outer wall of the groove. After the position is aligned, the head end of the film-coated bracket 6 can be bent at any angle (the bracket itself can be bent but cannot be twisted).

[0023] The process of using this invention:

[0024] In this invention, column 2 corresponds to the descending aorta, column 1 corresponds to the ascending aorta, and a fenestration opening leading to the supra-aortic branch artery is provided along the red marking line 3 7 at the head and tail ends of the covered stent 6.

[0025] If the relative angle between the ascending and descending main structures of a patient is 60 degrees (i.e., the angle between a plane containing the central axis of column 1 and column 2 and a plane containing the 180-degree line and the 0-degree line of the outer wall of the groove is 60 degrees on the 0-degree line side); if the surgeon wants to measure how much the orientation of the fenestrated opening on the covered stent differs from the 12 o'clock direction (head direction) of the arch apex after the covered stent reaches the arch apex and flips at this ascending and descending main angle, first, tighten the tail end of the covered stent 6 onto column 2, align the red marking line 37 on the tail end of the stent with the marking line 29 on column 2, then move column 1 to the corresponding 60-degree position (there is a corresponding angle scale on the outer wall of the groove) within the circular track 4, then bend the covered stent 6, and then fit the head end of the bent covered stent 6 onto the measuring column 5. The red marking line 7 (representing the position of the fenestration opening) on ​​the end of the covered stent 6 fitted on the measuring column 5 can display the corresponding precise deviation degree (representing the angle of deviation from the top of the measuring column 5 to 0 degrees) at the scale line indicated on the base of the measuring column 5. The 0-degree line at the top of the measuring column 5 represents the actual direction of the 12 o'clock position of the aortic arch, that is, the actual direction of the supra-aortic branch artery opening.

[0026] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A tool for measuring the rotation angle of an aortic endovascular stent graft, characterized in that, It includes column one, column two, chassis, circular track and measuring column; a circular track is provided on the chassis along the horizontal plane, and a movable column one is provided on the circular track perpendicular to the horizontal plane, which can move along the circular track; a column two is provided at the center of a virtual circle where the circular track is located, perpendicular to the horizontal plane; a measuring column is provided on the upper end face of column one, and the central axis of the measuring column intersects perpendicularly with the central axis of column two. A marking line 2 is provided along the conical generatrix on the outer wall of the second column; The annular track includes a circular inner ring and a circular outer ring with the same center as the inner ring; the inner ring sidewall and the outer ring sidewall are respectively provided perpendicular to the horizontal plane along the circumference of the inner ring and the outer ring sidewall; a movable track space is provided between the inner ring sidewall and the outer ring sidewall; the outer ring sidewall is provided with a scale. The first column is a cylinder, and the outer wall of the first column is marked with a marking line, which is parallel to the central axis of the first column. The measuring column is configured as a cylinder or a truncated cone, with graduations on the circumference of the bottom surface of the cylinder or truncated cone; graduations are also provided on the outer wall of the cylinder or truncated cone. The marking line on column one corresponds to the scale line on the outer side wall, representing the angle of rotation of column one around column two; Set up a virtual vertical plane that is perpendicular to the horizontal plane and contains the center axis of the second mark line and the second column. The two lines that intersect the vertical plane with the outer ring side wall are set as two scale lines. The scale line closer to the second mark line is set as the 180-degree line, and the scale line farther away from the second mark line is set as the 0-degree line. A 0-degree line is set at the highest point of the bottom surface of the measuring column, away from the top surface of column one.

2. The aortic stent graft rotation angle measuring tool as described in claim 1, characterized in that, The second column is designed as a truncated cone, with its central axis perpendicular to the horizontal plane and passing through the center of the circular track.

3. The aortic stent graft rotation angle measuring tool as described in claim 2, characterized in that, The second column is fixedly connected to the chassis; the measuring column is fixedly connected to the first column.

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