A special catheter for superselection of the left vertebral artery via the left radial artery

Abstract

The present invention discloses a special catheter for superselecting the left vertebral artery via the left radial artery, belonging to the technical field of medical equipment, including a first connecting pipe segment and a curved structure, the curved structure including a second connecting pipe segment, a third connecting pipe segment, a fourth connecting pipe segment and a fifth connecting pipe segment, the first connecting pipe segment is fixedly connected to the second connecting pipe segment, the cross-sectional radius of the open end of the fifth connecting pipe segment is smaller than the other end and is arranged in the left vertebral artery. In the present invention, by setting a curved structure composed of five connecting pipe segments, the bending position is relatively gentle to avoid touching and scratching the inner wall of the artery; by setting curved structures with different degrees of bending, it can be used at different sizes of vertebral artery angles; by setting an inner lining layer of PTFE material, the lubricity of internal instruments when passing through is increased; by setting an intermediate layer mixed with stainless steel wire, the overall stiffness is increased; by coating the outer surface with a super-slippery hydrophilic coating, the surface friction is reduced to reduce damage to the human body.

Description

Technical Field

[0001] The invention relates to the technical field of medical equipment, and in particular to a special catheter for superselecting the left vertebral artery via the left radial artery. Background Art

[0002] At present, due to the fact that cerebral angiography catheters are all designed based on the femoral artery approach and operating habits, most doctors still prefer to use the femoral artery approach to complete cerebral angiography. However, the femoral artery approach to cerebral angiography has the following disadvantages: the incidence of vascular puncture-related complications such as pseudoaneurysm, arteriovenous fistula, and retroperitoneal hematoma is high, especially in patients receiving intensive antiplatelet therapy; patients need to lie flat for a long time after completing angiography, which is very painful; the trauma is large, and the patient recovers slowly. Compared with cerebral angiography via the femoral artery approach, cerebral angiography via the radial artery approach can effectively reduce the occurrence of complications such as bleeding, hematoma, pseudoaneurysm, and arteriovenous fistula at the puncture site, and patients do not need to rest in bed after completing cerebral angiography, which is more comfortable. In most patients, the approach from the left vertebral artery is dominant, and the incidence of right subclavian tortuosity is higher. In these cases, the left radial artery approach provides an easier and more favorable approach.

[0003] In order to enable the operator to complete the selective intubation from the radial artery into the common carotid artery, the Chinese patent with the publication number CN209405455U discloses a carotid stent guide catheter for access via the right radial artery, the guide catheter includes a long connecting pipe segment, a connecting pipe segment, a short connecting pipe segment and a front connecting pipe segment connected in sequence, the long connecting pipe segment and the short connecting pipe segment are parallel to each other, the connecting pipe segment is arc-shaped, the long connecting pipe segment is longer than the short connecting pipe segment, there is an angle between the front connecting pipe segment and the short connecting pipe segment, the plane where the front connecting pipe segment is located is perpendicular to the plane where the long connecting pipe segment and the short connecting pipe segment are located, so that the operator can simply, conveniently and quickly insert the catheter from the radial artery into the common carotid artery, and provide stable support. However, this patented technology still has the problem that the opening end and the bend are easy to touch and scratch the inner wall of the artery during the catheter access process, causing discomfort to the patient, and the curved part of the catheter cannot be adapted to use at different sizes of vertebral artery angles. Summary of the invention

[0004] The purpose of the present invention is to provide a special catheter for superselecting the left vertebral artery via the left radial artery. By setting a curved structure composed of multiple connecting pipe segments, each curved position is relatively gentle, thereby solving the problem that the curved position touches and scratches the inner wall of the artery when the catheter is inserted; by setting two curved structures of different shapes, the problem of using the catheter in different situations of large vertebral artery angle and small vertebral artery angle is solved.

[0005] The purpose of the present invention can be achieved through the following technical scheme: a special catheter for superselecting the left vertebral artery via the left radial artery, comprising a catheter, the catheter comprising a first connecting pipe segment and a bending structure, the bending structure comprising a second connecting pipe segment, a third connecting pipe segment, a fourth connecting pipe segment, and a fifth connecting pipe segment, the first connecting pipe segment is fixedly connected to the second connecting pipe segment, the second connecting pipe segment is fixedly connected to the third connecting pipe segment, the third connecting pipe segment is fixedly connected to the fourth connecting pipe segment, and the fourth connecting pipe segment is fixedly connected to the fifth connecting pipe segment; the bending structure is composed of five connecting pipe segments, and the bending position is relatively gentle, which reduces the damage to the inner wall of the artery caused by contact.

[0006] The innermost layer of the catheter is the lining layer, the outer side of the lining layer is wrapped with the middle layer, the outer side of the middle layer is wrapped with the hardening layer, and the outer surface of the hardening layer is coated with a super-slippery hydrophilic coating. The super-slippery hydrophilic coating can effectively reduce its surface friction, thereby reducing damage to the human body, and at the same time reduce the intervention force of the catheter, which makes it easier for the device to penetrate the blood vessels, avoiding possible puncture of human blood vessels and tissue friction damage.

[0007] As a further solution of the present invention: the included angle a between the second connecting pipe section and the first connecting pipe section is 120° to 160°, and the length of the second connecting pipe section is 4 cm to 18 cm.

[0008] As a further solution of the present invention: the third connecting pipe segment is parallel to the first connecting pipe segment, the angle b between the third connecting pipe segment and the second connecting pipe segment is equal to a, the length of the third connecting pipe segment is 3 cm to 16 cm, and the angle c between the fourth connecting pipe segment and the third connecting pipe segment is 100° to 160°. The inclined third connecting pipe segment is used to reduce the bending degree of the curved part, which is applied to the case where the angle between the right end of the left subclavian artery of the patient and the left vertebral artery is large.

[0009] As a further solution of the present invention: the third connecting pipe segment is in the shape of an arc and the central angle e is 100° to 160°, one end of the third connecting pipe segment is tangent to the second connecting pipe segment, the other end of the third connecting pipe segment is tangent to the fourth connecting pipe segment, and the radius of the third connecting pipe segment is 3mm-16mm. The use of the arc-shaped third connecting pipe segment makes the bending degree of the curved part larger, and is applied to the case where the angle between the right end of the patient's left subclavian artery and the left vertebral artery is small.

[0010] As a further solution of the present invention: the length of the fourth connecting pipe segment is 4 cm to 19 cm, the angle d between the fifth connecting pipe segment and the fourth connecting pipe segment is 100° to 150°, and the length of the fifth connecting pipe segment is 3 cm to 18 cm. The angle between the first connecting pipe segment and the fifth connecting pipe segment in the curved structure is an acute angle, which prevents the open end of the fifth connecting pipe segment from contacting and piercing the inner wall of the artery during the insertion process.

[0011] As a further solution of the present invention, the cross-sectional radius of the opening end of the fifth connecting pipe segment is smaller than that of the other end thereof, thereby increasing the flexibility during insertion, reducing the stimulation and damage to the inner wall of the artery during the insertion process, and reducing the risk of iatrogenic cerebral embolism.

[0012] As a further solution of the present invention: the length of the super-slippery hydrophilic coating from the catheter tip to the other end is 40 cm-80 cm.

[0013] As a further solution of the present invention: the material of the inner lining layer is PTFE, which can increase the lubricity of the internal instruments when they pass through, and provide other instruments with smoother pushing properties and feel.

[0014] As a further solution of the present invention: stainless steel wires are mixed in the middle layer to increase the overall rigidity and provide better support for other devices during use.

[0015] As a further solution of the present invention: the material of the hardened layer is polyurethane, which has a certain hardness, so as to facilitate the delivery of the catheter during use.

[0016] Beneficial effects of the present invention:

[0017] (1) In the present invention, a bending structure is provided, which is composed of five connecting pipe segments, and the bending position is relatively gentle, thereby reducing the damage caused to the inner wall of the artery by the bending position during contact, and preventing the open end of the catheter from touching and scratching the inner wall of the artery during insertion.

[0018] (2) In one embodiment of the present invention, an inclined third connecting pipe segment is provided in the curved structure so that the curved degree of the curved structure is relatively gentle. The curved structure is applied to the case where the angle between the right end of the left subclavian artery and the left vertebral artery is relatively large, so that the curved structure can match the shape of the connection between the left subclavian artery and the left vertebral artery, thereby improving the applicability.

[0019] (3) In another embodiment of the present invention, a third connecting pipe segment in an arc shape is provided in the curved structure so that the curved structure has a greater degree of curvature and is applied to situations where the angle between the right end of the left subclavian artery and the left vertebral artery is small, so that the curved structure can match the shape of the connection between the left subclavian artery and the left vertebral artery, thereby improving its applicability.

[0020] (4) In the present invention, by providing an inner lining layer of PTFE material, the lubricity of the internal instruments is increased when passing through, providing other instruments with smoother pushing properties and feel; by providing an intermediate layer mixed with stainless steel wire, the overall rigidity can be increased, providing better support for other instruments; by providing a hardening layer made of polyurethane, it is convenient to deliver the catheter; by coating the outer surface with an ultra-slippery hydrophilic coating, the ultra-slippery hydrophilic coating can effectively reduce its surface friction, thereby reducing damage to the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the placement position when the first embodiment of the present invention is used;

[0024] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0025] Figure 4 is a schematic diagram of the overall structure of the second embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of the placement position when the second embodiment of the present invention is used.

[0027] In the figure: 1. catheter; 101. first connecting pipe segment; 102. second connecting pipe segment; 103. third connecting pipe segment; 104. fourth connecting pipe segment; 105. fifth connecting pipe segment; 106. lining layer; 107. middle layer; 108. hardening layer; 2. left vertebral artery; 3. left subclavian artery; 4. descending aorta; 5. ascending aorta; 6. right vertebral artery; 7. right common carotid artery; 8. left common carotid artery. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Embodiment 1 of the present invention: Figure 1-3 As shown, a special catheter for superselecting the left vertebral artery via the left radial artery includes a catheter 1, the innermost part of the catheter 1 is an inner lining layer 106, the material of the inner lining layer 106 is PTFE, the outer side of the inner lining layer 106 is wrapped with an intermediate layer 107, the intermediate layer 107 is mixed with stainless steel wire, the outer side of the intermediate layer 107 is wrapped with a hardening layer 108, the material of the hardening layer 108 is polyurethane, and the outer surface of the hardening layer 108 is coated with an ultra-slippery hydrophilic coating, the length of the ultra-slippery hydrophilic coating starts from the left end of the catheter 1, and the length ranges from 40cm to 80cm.

[0032] The catheter 1 includes a first connecting pipe section 101 and a curved structure, wherein the curved structure includes a second connecting pipe section 102, a third connecting pipe section 103, a fourth connecting pipe section 104 and a fifth connecting pipe section 105. The left end of the first connecting pipe section 101 is fixedly connected to the second connecting pipe section 102, the length of the second connecting pipe section 102 is 4 cm to 18 cm, the angle a between the second connecting pipe section 102 and the first connecting pipe section 101 is 120° to 160°, the left end of the second connecting pipe section 102 is fixedly connected to the third connecting pipe section 103, the length of the third connecting pipe section 103 is 3 cm to 16 cm, the third connecting pipe section 103 is parallel to the first connecting pipe section 101, and the third connecting pipe section 104 is parallel to the first connecting pipe section 101. The angle b between the segment 103 and the second connecting pipe segment 102 is equal to a, the left end of the third connecting pipe segment 103 is fixedly connected with the fourth connecting pipe segment 104, the length of the fourth connecting pipe segment 104 is 4cm-19cm, the angle c between the fourth connecting pipe segment 104 and the third connecting pipe segment 103 is 100°-160°, the left end of the fourth catheter 1 segment is fixedly connected with the fifth connecting pipe segment 105, the length of the fifth connecting pipe segment 105 is 3cm-18cm, the angle d between the fifth connecting pipe segment 105 and the fourth connecting pipe segment 104 is 100°-150°, and the cross-sectional radius of the opening end of the fifth connecting pipe segment 105 is smaller than the other end and is arranged in the left vertebral artery 2. The bending degree of the curved part in this embodiment is small, and it is applied to the case where the angle between the right end of the left subclavian artery 3 of the patient and the left vertebral artery 2 is large.

[0033] Embodiment 2 of the present invention: Figure 4-5 As shown, the structures other than the third connecting pipe segment 103 are the same as those in the first embodiment. The third connecting pipe segment 103 is in the shape of an arc and the central angle e is 100° to 160°. The right end of the third connecting pipe segment 103 is tangent to the second connecting pipe segment 102. The radius of the third connecting pipe segment 103 is 3mm-16mm. The left end of the third connecting pipe segment 103 is tangent to the fourth connecting pipe segment 104. The bending degree of the curved part in this embodiment is relatively small, and it is applied to the case where the angle between the right end of the patient's left subclavian artery 3 and the left vertebral artery 2 is relatively small.

[0034] Working principle of the present invention: The present invention relates to a special catheter 1 for superselecting the left vertebral artery through the left radial artery. When in use, the catheter 1 is inserted along the right segment of the left subclavian artery 3 through the left access. The curved structure of the catheter 1 is located at the connection between the left subclavian artery 3 and the left vertebral artery 2. The fifth connecting pipe segment 105 at the left end of the catheter 1 is placed in the left vertebral artery 2, and the first connecting pipe segment 101 of the catheter 1 is placed in the right part of the left subclavian artery 3. The curved structure consists of five connecting pipe segments, and the curved position is relatively gentle, which reduces the damage to the inner wall of the artery during contact. The material of the inner lining layer 106 is PTFE, which can increase the lubricity of the internal instrument when passing through it, and provide smoother pushing and feel for other instruments. The middle layer 107 wrapped by the outer layer of the inner lining layer 106 is mixed with stainless steel wire, which can increase the overall rigidity and provide better support for other instruments. The material of the hardening layer 108 wrapped by the outer layer of the middle layer 107 is polyurethane, which is convenient for delivering the catheter 1. The outer surface of the hardened layer 108 is coated with an ultra-slippery hydrophilic coating, which can effectively reduce its surface friction, thereby reducing damage to the human body and reducing the intervention force of the catheter 1, making it easier for the device to penetrate the blood vessels and avoiding possible puncture of human blood vessels and tissue friction damage.

[0035] In the first and second embodiments, according to the actual conditions in the patient's body, the third connecting pipe segment 103 of different shapes is adopted to match the curved structure on the left side of the catheter 1 with the shape of the connection between the left subclavian artery 3 and the left vertebral artery 2, so as to facilitate the placement of the fifth connecting pipe segment 105 into the left vertebral artery 2, and at the same time reduce the discomfort and other adverse effects on the patient caused by the contact with the inner wall of the artery during the placement of the catheter 1. The angle between the first connecting pipe segment 101 and the fifth connecting pipe segment 105 in the curved structure is an acute angle, which prevents the open end of the fifth connecting pipe segment 105 from contacting and piercing the inner wall of the artery during the placement process. The cross-sectional radius of the open end of the fifth connecting pipe segment 105 is smaller than that of the other end, which increases the flexibility during placement, reduces the stimulation and damage to the inner wall of the artery during contact during the placement process, and reduces the risk of iatrogenic cerebral embolism.

[0036] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A catheter for superselecting the left vertebral artery via the left radial artery, characterized in that: The catheter (1) comprises a first connecting pipe section (101) and a curved structure, the curved structure comprising a second connecting pipe section (102), a third connecting pipe section (103), a fourth connecting pipe section (104) and a fifth connecting pipe section (105), the first connecting pipe section (101) being fixedly connected to the second connecting pipe section (102), the second connecting pipe section (102) being fixedly connected to the third connecting pipe section (103), the third connecting pipe section (103) being fixedly connected to the fourth connecting pipe section (104), and the fourth connecting pipe section (104) being fixedly connected to the fifth connecting pipe section (105); The innermost layer of the catheter (1) is an inner lining layer (106), the outer side of the inner lining layer (106) is wrapped with an intermediate layer (107), the outer side of the intermediate layer (107) is wrapped with a hardening layer (108), and the outer surface of the hardening layer (108) is coated with an ultra-slippery hydrophilic coating; The material of the lining layer (106) is PTFE; The middle layer (107) is mixed with stainless steel wires; The material of the hardened layer (108) is polyurethane; The included angle a between the second connecting pipe section (102) and the first connecting pipe section (101) is 120° to 160°, and the length of the second connecting pipe section (102) is 4 cm to 18 cm; The third connecting pipe section (103) and the first connecting pipe section (101) are parallel to each other, the included angle b between the third connecting pipe section (103) and the second connecting pipe section (102) is equal to a, the length of the third connecting pipe section (103) is 3 cm to 16 cm, and the included angle c between the fourth connecting pipe section (104) and the third connecting pipe section (103) is 100° to 160°; The cross-sectional radius of the opening end of the fifth connecting pipe section (105) is smaller than that of the other end thereof.

2. A dedicated catheter for superselecting the left vertebral artery via the left radial artery according to claim 1, characterized in that: The third connecting pipe segment (103) is in the shape of an arc and has a central angle e of 100° to 160°; one end of the third connecting pipe segment (103) is tangent to the second connecting pipe segment (102); the other end of the third connecting pipe segment (103) is tangent to the fourth connecting pipe segment (104); and the radius of the third connecting pipe segment (103) is 3 mm to 16 mm.

3. A dedicated catheter for superselecting the left vertebral artery via the left radial artery according to any one of claims 1-2, characterized in that: The length of the fourth connecting pipe section (104) is 4 cm to 19 cm, the included angle d between the fifth connecting pipe section (105) and the fourth connecting pipe section (104) is 100° to 150°, and the length of the fifth connecting pipe section (105) is 3 cm to 18 cm.

4. A dedicated catheter for superselecting the left vertebral artery via the left radial artery according to claim 1, characterized in that: The length of the super-slippery hydrophilic coating from the head end to the other end of the catheter (1) is 40 cm to 80 cm.

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