Universal catheter for accessing visceral arteries via the radial artery

Abstract

This invention relates to a universal catheter for accessing visceral arteries via the radial artery, belonging to the field of medical device technology. The catheter is hook-shaped and comprises, on the same plane, a first straight segment, a first curved segment, a second straight segment, a second curved segment, a third straight segment, a third curved segment, and a straight head segment arranged sequentially from the end closest to the operator, with the straight head segment facing the beginning of the catheter. The specialized catheter provided by this invention increases the catheter's curvature, resulting in better stability after insertion into the target vessel; it also has better torque transmission capability, good maneuverability, and makes it easier to reach the target location within the blood vessel, shortening the operation time and increasing the success rate of the surgery.

Description

Technical Field

[0001] This invention relates to a universal catheter for accessing visceral arteries via the radial artery, belonging to the field of medical device technology. Background Technology

[0002] Transarterial catheterization is the primary surgical approach for the vast majority of cardiac, neurological, oncological, and vascular interventional surgeries. The biggest advantages of interventional surgery are its minimally invasive nature, minimal damage, rapid recovery, and high patient comfort. The most commonly used puncture route for arterial catheterization is the femoral artery. After successful arterial puncture, a catheter sheath is inserted, through which various catheters, guidewires, and other instruments are introduced to perform the procedure and ultimately achieve the therapeutic goal.

[0003] Interventional procedures using the radial artery approach were first and gradually adopted in cardiac coronary intervention. The radial artery, located on the radial side of the forearm, supplies blood to the hand. Its superficial location makes it easily palpable, and it is not accompanied by any important blood vessels or nerves. The anatomical location of the radial artery makes puncture and catheter placement relatively easy, postoperative compression for hemostasis is convenient, observation is easy, and complications are few. Because the hand is supplied by a dual circulation of the radial and ulnar arteries, even if radial artery occlusion occurs postoperatively, it usually does not significantly affect the blood supply to the hand. Currently, the radial artery approach is widely used in various directions of interventional procedures in the cardiac, neurological, oncological, and visceral vascular fields.

[0004] Peripheral interventional therapy via the radial artery approach offers advantages such as improved patient comfort, enhanced safety, reduced puncture site complications, and shorter hospital stays. In the past five years, with the increasing clinical application of peripheral interventional therapy via the radial artery approach, most peripheral interventional procedures can now be performed using this method. However, there is currently no dedicated catheter for the radial artery approach. Currently, most procedures via the radial artery approach use traditional MPA or Cobra catheters. The drawbacks of this approach are: the current catheter shape cannot effectively achieve target vessel insertion, especially in cases of aortic arch torsion, where crossing the arch is difficult; poor stability of the catheter insertion into the target vessel; difficulty in inserting into vessels originating from the foot towards the head; these drawbacks prolong the procedure time and increase radiation dose to both patients and medical staff. Furthermore, the length of the currently used catheters is insufficient. Therefore, there is an urgent need in this technical field for a special catheter for cannulation via the radial artery approach, which would make the surgical procedure smoother, easier to insert into the target vessel (catheter artery, left gastric artery or diaphragmatic artery), and more stable after insertion; thereby shortening the operation time, reducing the radiation dose to doctors and patients, and achieving faster and safer treatment. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problem of how to obtain a special catheter for cannulation via the radial artery approach, which makes the procedure smoother, easier to insert into the target vessel, and more stable after insertion, thereby shortening the operation time and reducing the radiation dose to both doctors and patients.

[0006] To address the aforementioned problems, the present invention provides a universal catheter for accessing visceral arteries via the radial artery. The catheter is hook-shaped and comprises a series of segments arranged sequentially from the end closest to the operator, including a first straight segment, a first arc segment, a second straight segment, a second arc segment, a third straight segment, a third arc segment, and a straight head segment, all on the same plane. The intersection of the first straight segment and the first arc segment is designated as starting point one; the intersection of the second straight segment and the second arc segment is designated as ending point one; and the intersection of the third straight segment and the third arc segment is designated as starting point two. A virtual rectangular coordinate system is established on the plane, with the starting end of the first straight segment as the reference point. The origin is defined as follows: a Y-axis is established from the origin towards the first arc segment; the angle between the first straight segment and the Y-axis is α, with α being 10°; the X-axis is perpendicular to the Y-axis; the guide tube is located in the second quadrant; the second straight segment is parallel to the X-axis; the straight head segment faces the origin; the distance between the projections of the first starting point and the first ending point on the X-axis is L, where L is 40mm-50mm; the distance between the projections of the first starting point and the first ending point on the Y-axis is H0, where H0 is 25mm; the distance between the projections of the first ending point and the second starting point on the X-axis is L1, where L1 is 10mm; the angle between the second and third straight segments is β, with β being 120°; the lengths of the third arc segment and the straight head segment are less than or equal to 10mm.

[0007] Preferably, the distance between the projections of the endpoint one and the starting point two on the Y-axis is less than H0.

[0008] Preferably, L is 40mm or 50mm.

[0009] Preferably, the length of the universal catheter is 80cm, 125cm, 130cm, or 150cm.

[0010] Preferably, the diameter of the universal catheter is 4Fr or 5Fr.

[0011] Preferably, the material of the universal catheter includes block polyetheramide, polyurethane elastomer and 304 stainless steel.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] The special catheter provided by this invention has the advantages of being easy to pass over the arch, easy to adhere to the wall, and easy to insert into the target blood vessel branch;

[0014] The special catheter provided by this invention has increased catheter curvature, which makes the catheter more stable after insertion into the target blood vessel; it has better torque transmission capability, better maneuverability, and is easier to enter the target position in the blood vessel, which can shorten the operation time and increase the success rate of the operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2 This is a diagram showing the common anatomical classifications of the aortic arch, types I-III.

[0017] Figure 3 This is a morphological diagram of the present invention and the MPA catheter at the aortic arch.

[0018] Figure A shows the MPA catheter, and Figure B shows the catheter of this invention.

[0019] Figure 4 This is a schematic diagram of the superselective placement of the catheter of the present invention in the diaphragmatic artery, left gastric artery, and celiac trunk artery.

[0020] Attached diagram labels: 1. First straight line segment; 2. First arc segment; 3. Second straight line segment; 4. Second arc segment; 5. Third straight line segment; 6. Third arc segment; 7. Head segment; 8. Starting point one; 9. End point one; 10. Starting point two; 11. Beginning end. Detailed Implementation

[0021] To make the present invention more apparent and understandable, preferred embodiments are described in detail below:

[0022] like Figure 1As shown, this invention provides a universal catheter for accessing visceral arteries via the radial artery. The catheter is hook-shaped and includes a first straight segment 1, a first arc segment 2, a second straight segment 3, a second arc segment 4, a third straight segment 5, a third arc segment 6, and a straight head segment 7, arranged sequentially from the end closest to the operator on the same plane. The intersection of the first straight segment 1 and the first arc segment 2 is designated as the starting point 8, the intersection of the second straight segment 3 and the second arc segment 4 is designated as the ending point 9, and the intersection of the third straight segment 5 and the third arc segment is designated as the starting point 10. A virtual rectangular coordinate system is established on the plane, with the starting end 11 of the first straight segment 1 as the origin, and extending from the origin to the first... The arc segment 2 is oriented along the Y-axis. The first straight segment 1 forms an angle α with the Y-axis, where α is 10°. The X-axis is perpendicular to the Y-axis. The guide tube is located in the second quadrant. The second straight segment 3 is parallel to the X-axis. The straight head segment 7 faces the origin. The distance between the projections of the starting point 1 8 and the ending point 1 9 on the X-axis is L, which is 40mm-50mm. The distance between the projections of the starting point 1 8 and the ending point 1 9 on the Y-axis is H0, which is 25mm. The distance between the projections of the ending point 1 9 and the starting point 2 10 on the X-axis is L1, which is 10mm. The angle between the second straight segment 3 and the third straight segment 5 is β, where β is 120°. The lengths of the third arc segment 6 and the straight head segment 7 are less than or equal to 10mm. The distance between the projections of the ending point 1 9 and the starting point 2 10 on the Y-axis is less than H0.

[0023] Optional, L is 40mm or 50mm.

[0024] The standard catheter lengths are 80cm, 125cm, 130cm, and 150cm. The standard catheter diameters are 4Fr and 5Fr. The standard catheter materials include block polyetheramide, polyurethane elastomer, and 304 stainless steel.

[0025] Example

[0026] like Figure 1-4 As shown, the main body of the angiography catheter of this invention is made of Pebax block polyetheramide, polyurethane elastomer, and 304 stainless steel. The angiography catheter includes a head (i.e., the third straight segment 5, the third arc segment 6, and the straight head segment 7) at the end furthest from the operator, a middle section (i.e., the first arc segment 2, the second straight segment 3, and the second arc segment 4), and a tail (i.e., the first straight segment 1). The head and middle section adopt an arc-shaped structure, while the tail adopts a linear structure. The arc-shaped structure of the head and the arc-shaped structure of the middle section form a certain angle β. The length of the proximal end of the head and the middle section can be adjusted based on the relative position of the target blood vessel opening and the descending aorta. The linear structure of the tail forms a certain angle α with the vertical direction. Compared with existing technologies, it has better torque transmission capability during use, better maneuverability, easier access to the target location within the blood vessel, shorter operation time, and increased success rate.

[0027] a. The catheter lengths of 80cm, 125cm, 130cm, and 150cm are suitable for catheterization of abdominal and pelvic vessels via the radial artery approach;

[0028] b. The catheter diameter is 4Fr or 5Fr;

[0029] c. Catheter morphology as follows Figure 1 ; where α angle is 10 degrees, β angle is 120 degrees; L length is 40mm, 50mm; L1 length is 10mm.

[0030] Currently, the commonly used catheters for peripheral intervention in clinical practice via the radial artery approach are the MPA catheter or the Cobra catheter; among them, the MPA catheter is available in 100cm and 125cm lengths, while the Cobra catheter is only available in 100cm and 110cm lengths.

[0031] There are three common anatomical classifications of the aortic arch (e.g.) Figure 2 As shown in the diagram, based on the relationship between the brachiocephalic trunk and the aortic orifice and the subclavian artery, it is classified into three types, I-III. In types I-III, the angle between the aortic arch and the brachiocephalic trunk is larger, and with increasing age, the aortic arch often rises, further increasing the angle. When using the radial artery approach, regardless of whether it's a left or right approach, the large aortic arch angle, coupled with the insufficient curvature of current MPA and Cobra catheters, makes crossing the aortic arch difficult. This necessitates switching to other catheter types during the procedure, such as SIM type I and II catheters to assist in crossing the aortic arch. Since SIM type I and II are not suitable for superselective vascularization of the abdominal cavity, the catheter is flipped over and then replaced with an MPA or Cobra catheter to continue superselective vascularization. This prolongs the operation time, increases the radiation exposure dose, and increases the patient's surgical costs.

[0032] like Figure 3 As shown in the figure, the MPA catheter and the novel catheter of the present invention are located in the aortic arch. Under the guidance of the guidewire, the novel radial artery catheter of the present invention can easily cross the aortic arch without the need for additional catheter replacement.

[0033] During the downward course of the abdominal aorta, most of the abdominal vessels branch off downward or at a near-horizontal angle before reaching their respective organs. Therefore, for patients with minimal changes in general anatomical morphology, the MPA catheter and Cobra catheter, with their smaller angles, can more easily achieve superselective vascular cannulation.

[0034] Bilateral diaphragmatic arteries often originate from the abdominal aorta and run directly upwards to supply the bilateral diaphragm muscles. They form a small angle with the abdominal aorta and run upwards. Therefore, MPA catheters and Cobra catheters often have difficulty in superselecting such vessels. Even if superselection is successful, anchoring is difficult and slippage is common. Similar situations include the left gastric artery and celiac trunk arteries with small angles.

[0035] like Figure 4 As shown, the arc shape and angle of the novel catheter of the present invention are beneficial for superselective angiography of arteries such as the diaphragmatic artery, left gastric artery, and celiac trunk with upward opening angle.

[0036] Clinically, as patients age, the aortic arch angle becomes more pronounced and its position rises. Currently available MPA catheters present difficulties in crossing the aortic arch due to the catheter's single angle. Furthermore, after the catheter enters the abdominal aorta, the phrenic artery and left gastric artery typically face anterosuperiorly. If superselection to the phrenic artery or left gastric artery is required, the existing MPA and Cobra catheters struggle to achieve this due to the angle issue.

[0037] The special catheter of this invention has the advantages of easy passage through the arch, easy adherence to the wall, and easy insertion into the target blood vessel branch; the special catheter of this invention increases the catheter curvature, making the catheter more stable after insertion into the target blood vessel; it has better torque transmission capability, good maneuverability, and is easier to enter the target position in the blood vessel, shortening the operation time and increasing the success rate of the operation.

[0038] Use of this invention:

[0039] a. After inserting the catheter sheath via radial artery puncture;

[0040] b. The new type of catheter, used in conjunction with a conventional guidewire, can pass smoothly through the aortic arch;

[0041] c. After entering the abdominal aorta, it is possible to selectively insert cannulas into the celiac artery, left gastric artery, bilateral diaphragmatic arteries, etc., especially the more difficult diaphragmatic artery and left gastric artery.

[0042] This invention is used for catheterization and angiography of abdominal and pelvic vessels via the radial artery approach, and can be extended to other blood vessels.

[0043] 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 universal catheter for accessing visceral arteries via the radial artery, characterized in that, The catheter is hook-shaped and comprises a series of segments arranged on the same plane, starting from the end closest to the operator: a first straight segment, a first arc segment, a second straight segment, a second arc segment, a third straight segment, a third arc segment, and a straight head segment. The intersection of the first straight segment and the first arc segment is designated as starting point one, the intersection of the second straight segment and the second arc segment is designated as ending point one, and the intersection of the third straight segment and the third arc segment is designated as starting point two. A virtual rectangular coordinate system is established on the plane, with the starting end of the first straight segment as the origin. A Y-axis is defined from the origin towards the first arc segment, with the angle between the first straight segment and the Y-axis being α. The X-axis is perpendicular to the Y-axis, and the catheter is located in the second quadrant. The second straight segment is parallel to the X-axis. The angle between the second straight segment and the third straight segment is β. The α angle is 10°; the straight head segment faces the origin; the distance between the projections of the starting point one and the ending point one on the X-axis is L, where L is 40mm-50mm; the distance between the projections of the starting point one and the ending point one on the Y-axis is H0, where H0 is 25mm; the distance between the projections of the ending point one and the starting point two on the X-axis is L1, where L1 is 10mm; the angle between the second straight segment and the third straight segment is β, where β is 120°; the length of the third arc segment and the straight head segment is less than or equal to 10mm.

2. The universal catheter for accessing visceral arteries via the radial artery according to claim 1, characterized in that, The distance between the projections of endpoint one and starting point two on the Y-axis is less than H0.

3. The universal catheter for accessing visceral arteries via the radial artery as described in claim 1, characterized in that, The value of L is 40mm or 50mm.

4. The universal catheter for accessing visceral arteries via the radial artery according to claim 1, characterized in that, The standard catheter lengths are 80cm, 125cm, 130cm, and 150cm.

5. A universal catheter for accessing visceral arteries via the radial artery according to claim 1, characterized in that, The diameter of the general-purpose catheter is 4Fr or 5Fr.

6. A universal catheter for accessing visceral arteries via the radial artery according to claim 1, characterized in that, The materials used for the universal catheter include block polyetheramide, polyurethane elastomer, and 304 stainless steel.

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