Medical delivery catheter

Abstract

The invention provides a medical delivery catheter in the technical field of medical instruments, the medical delivery catheter comprises a delivery catheter layer and a delivery catheter section, the delivery catheter layer comprises a delivery layer, a support skeleton layer and a protective layer, and the delivery catheter section comprises a bidirectional bending adjustment section, a bending adaptation section and a straight section support section. A conveying layer, a supporting framework layer and a protective layer are sequentially arranged on each of the two-way bending adjusting section, the bending adapting section and the straight supporting section from inside to outside, and the supporting framework layers on the two-way bending adjusting section, the bending adapting section and the straight supporting section are of hollow mesh structures. The hollow mesh structures with bending elasticity are adopted on the supporting framework layers on the two-way bending adjusting section, the bending adapting section and the straight supporting section, existing woven wire structures in the current market are replaced, higher supporting performance and torsion resistance are provided for the catheter, the technical problem that an arch back exists on an existing catheter can be solved, and the catheter has the advantages of being simple in structure and convenient to use. And meanwhile, the problem that the pushing force is insufficient in the advancing process of the catheter can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular, to a medical delivery catheter. BACKGROUND

[0002] The mitral valve is a critical valve between the left atrium and the left ventricle of the heart, and its function is to ensure that blood flows smoothly from the left atrium to the left ventricle during diastole, and effectively prevents blood from flowing back to the left atrium during systole. However, due to various factors (such as rheumatic heart disease, degeneration, congenital abnormalities, etc.), the mitral valve may be damaged, leading to conditions such as mitral stenosis or regurgitation, which can affect the normal function of the heart and even cause serious consequences such as heart failure.

[0003] In the case of severe mitral valve disease that cannot be restored by repair methods, mitral valve replacement has become an important treatment method. Traditional mitral valve replacement usually requires open chest surgery, establishing extracorporeal circulation, removing the diseased mitral valve, and implanting an artificial heart valve to replace its function. Although this method is effective, it has a large surgical trauma, a long postoperative recovery time, and a significantly increased surgical risk for elderly, weak, or patients with other serious diseases.

[0004] With the progress of medical technology, minimally invasive and interventional treatment methods have gradually emerged, providing new options for mitral valve replacement. However, existing minimally invasive mitral valve replacement techniques still face many challenges, such as complex surgical procedures, difficult valve positioning, and poor implant stability, which limit their widespread application in clinical practice.

[0005] Delivering an implant to a desired location in the human body, such as delivering a replacement heart valve to the mitral valve, can also be challenging, and existing medical delivery catheters have the following problems:

[0006] 1. Insufficient pushing force: During surgery, doctors need to precisely control the position of the catheter by pushing it. If the catheter itself is not strong enough, it may lack sufficient force when pushed, making it difficult for the catheter to advance along the intended path, which is not conducive to the smooth progress of the surgery.

[0007] 2. Poor support: After reaching the diseased site, the catheter needs to provide some support for subsequent treatment operations (such as balloon dilation, stent implantation, etc.). If the catheter is too soft, its support may be insufficient, which is not conducive to the smooth progress of the surgery.

[0008] 3. Poor torsion resistance: During the operation, it is often necessary to adjust the angle and direction of the implant, and the interventional catheter needs to be rotated to complete the operation. If the torsion resistance of the catheter is insufficient, the torsion generated after rotation will not be transmitted to the front end of the catheter, and the front end of the catheter will not rotate, which is not conducive to the smooth progress of the operation.

[0009] 4. Catheter "arch" problem: The existing medical delivery catheter has poor support and insufficient torsion resistance, which causes bending and "arch" technical problems, which is not conducive to the smooth progress of the operation. SUMMARY

[0010] In view of the defects in the prior art, the purpose of the present application is to provide a medical delivery catheter.

[0011] According to the medical delivery catheter provided by the present application, the delivery catheter layer comprises a delivery layer, a support framework layer and a protective layer, and the delivery catheter layer is sequentially provided with the delivery layer, the support framework layer and the protective layer from inside to outside;

[0012] The delivery catheter segment comprises a bidirectional bending adjustment segment, a bending adaptation segment and a straight segment support segment, and the delivery catheter segment is sequentially provided with the bidirectional bending adjustment segment, the bending adaptation segment and the straight segment support segment from head to tail;

[0013] And the bidirectional bending adjustment segment, the bending adaptation segment and the straight segment support segment are sequentially provided with the delivery layer, the support framework layer and the protective layer from inside to outside;

[0014] And the support framework layer on the bidirectional bending adjustment segment, the bending adaptation segment and the straight segment support segment adopts a hollow mesh structure.

[0015] In some embodiments, the delivery layer adopts a PTFE material delivery layer, the support framework layer adopts a stainless steel material support framework layer, and the protective layer adopts a PTFE material protective layer.

[0016] In some embodiments, the support framework layer comprises a support framework layer one, a support framework layer two and a support framework layer three;

[0017] The support framework layer one is arranged on the bidirectional bending adjustment segment, and the support framework layer one adopts an elliptical hollow mesh structure;

[0018] The support framework layer two is arranged on the bending adaptation segment, and the support framework layer two adopts a wave-shaped hollow mesh structure;

[0019] The support framework layer three is arranged on the straight segment support segment, and the support framework layer three adopts a trapezoidal hollow mesh structure.

[0020] In some embodiments, the support framework layer one comprises a plurality of elliptical cutting layers, and the plurality of elliptical cutting layers are symmetrically arranged on both sides of the support framework layer one.

[0021] The support framework layer two comprises a plurality of wave-shaped cutting lines, and the plurality of wave-shaped cutting lines are uniformly and densely arranged on the surface of the support framework layer two.

[0022] The support framework layer three comprises a plurality of isosceles trapezoidal cutting lines, and the plurality of isosceles trapezoidal cutting lines form a single rhombic cutting line unit, and the plurality of rhombic cutting line units are uniformly arranged on the surface of the support framework layer three.

[0023] In some embodiments, the two-way bending section is arranged to bend to the left or to the right within a bending angle range of 0°-200°.

[0024] In some embodiments, the two-way bending section, the bending adaptation section and the straight section support section are integrally connected in sequence.

[0025] In some embodiments, the medical delivery catheter is a cylindrical medical delivery catheter.

[0026] Compared with the prior art, the present application has the following advantages:

[0027] 1. The present application provides stronger support and torsional resistance by arranging support framework layers on the two-way bending section, the bending adaptation section and the straight section support section, and by using the hollow mesh structure with bending elasticity instead of the existing woven wire structure on the market, thereby solving the technical problem of "back arching" of the catheter and the problem of insufficient pushing force during the movement of the catheter.

[0028] 2. The two-way bending section of the present application uses the elliptical hollow mesh structure support framework layer with bending elasticity, so that the first section of the catheter can be bent to the left or to the right within a bending angle range of 0-200 degrees, which facilitates adjustment of the bending angle direction according to the specific situation during the implementation of the surgery, improves the convenience of use, and facilitates smooth surgery.

[0029] 3. The bending adaptation section of the present application uses the wave-shaped hollow mesh structure support framework layer with bending elasticity, so that the second section of the catheter has bending adaptability and bending toughness in any direction, while also having strong support strength, which facilitates smooth surgery during the surgery.

[0030] 4、The straight section supporting section of the present application adopts the trapezoidal hollow mesh structure supporting framework layer with bending elasticity, ensures that the third section of the catheter of the present application has supporting property and torsional resistance, and further ensures that the third section of the catheter of the present application will not easily deform during the conveying process, maintains stability, and is beneficial to the smooth operation of the surgery during the surgery process. BRIEF DESCRIPTION OF DRAWINGS

[0031] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments thereof, read in conjunction with the accompanying drawings:

[0032] Figure 1 It is a schematic view of the shaft of the medical conveying catheter of the present application;

[0033] Figure 2 It is a partial enlarged schematic view of the medical conveying catheter of the present application;

[0034] Figure 3 It is a schematic view of the structure of the conveying catheter layer on the medical conveying catheter of the present application;

[0035] Figure 4 It is a sectional view schematic view of the conveying catheter layer on the medical conveying catheter of the present application;

[0036] Figure 5 It is a partial enlarged schematic view of the bidirectional bending adjusting section on the medical conveying catheter of the present application;

[0037] Figure 6 It is an enlarged schematic view of the supporting framework layer one on the bidirectional bending adjusting section of the medical conveying catheter of the present application;

[0038] Figure 7 It is a plane development schematic view of the supporting framework layer one on the bidirectional bending adjusting section of the medical conveying catheter of the present application;

[0039] Figure 8 It is a partial enlarged schematic view of the bending adapting section on the medical conveying catheter of the present application;

[0040] Figure 9 It is an enlarged schematic view of the supporting framework layer two on the bending adapting section of the medical conveying catheter of the present application;

[0041] Figure 10 It is a plane development schematic view of the supporting framework layer two on the bending adapting section of the medical conveying catheter of the present application;

[0042] Figure 11 It is a partial enlarged schematic view of the straight section supporting section on the medical conveying catheter of the present application;

[0043] Figure 12 It is an enlarged schematic view of the supporting framework layer three on the straight section supporting section of the medical conveying catheter of the present application;

[0044] Figure 13 Figure 3 is a planar expanded view of the support framework layer three on the straight section support section of the medical delivery catheter of the present application;

[0045] Figure 14 Figure 4 is a schematic view of the technical problem of the prior art medical delivery catheter;

[0046] Figure 15 Figure 5 is a front view of the medical delivery catheter of the present application;

[0047] Figure 16 Figure 6 is an enlarged view of the support framework layer three on the straight section support section of the medical delivery catheter of the present application using the support framework layer three of embodiment two;

[0048] Figure 17 Figure 7 is a partial enlarged view of the support framework layer three on the straight section support section of the medical delivery catheter of the present application using the support framework layer three of embodiment two;

[0049] Figure 18 Figure 8 is a planar expanded view of the support framework layer three on the straight section support section of the medical delivery catheter of the present application using the support framework layer three of embodiment two;

[0050] Figure 19 Figure 9 is a planar expanded partial enlarged view of the support framework layer three on the straight section support section of the medical delivery catheter of the present application using the support framework layer three of embodiment two;

[0051] Figure 20 Figure 10 is an enlarged view of the support framework layer three on the straight section support section of the medical delivery catheter of the present application using the support framework layer three of embodiment three;

[0052] Figure 21 Figure 11 is a planar expanded view of the support framework layer three on the straight section support section of the medical delivery catheter of the present application using the support framework layer three of embodiment three;

[0053] Figure 22 Figure 12 is an enlarged view of the support framework layer three on the straight section support section of the medical delivery catheter of the present application using the support framework layer three of embodiment four;

[0054] Figure 23 Figure 13 is a planar expanded view of the support framework layer three on the straight section support section of the medical delivery catheter of the present application using the support framework layer three of embodiment four.

[0055] Reference numerals:

[0056] Delivery catheter layer 1 Concave groove two 1225

[0057] Delivery layer 11 U-shaped groove two 1226

[0058] Support framework layer 12 Support framework layer three 123

[0059] Support framework layer one 121 Support framework layer three 123'

[0060] Elliptical cutting layer 1211 support skeleton layer three 123"

[0061] Semi-elliptical cutting layer 1212 support skeleton layer three 123'''

[0062] Small elliptical hole one 1213 isosceles trapezoidal cutting 1231

[0063] Large elliptical hole one 1214 rhombic cutting pattern unit 1232

[0064] Concave groove one 1215 round hole 1233

[0065] U-shaped groove one 1216 long oval hole two 1234

[0066] Support skeleton layer two 122 protective layer 13

[0067] Wavy cutting 1221 conveying pipe section 2

[0068] Long wavy cutting 12211 bidirectional bending section 21

[0069] Short wavy cutting 12212 bending adaptation section 22

[0070] Small elliptical hole two 1222 straight section support section 23

[0071] Large elliptical hole two 1223 arch 3

[0072] Long oval hole one 1224 DETAILED DESCRIPTION

[0073] The present application will be described in detail below with specific examples. The following examples will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of changes and improvements can be made. These are within the scope of the present application.

[0074] Example 1

[0075] As Figures 1-15As shown, the medical delivery catheter of the present invention includes a delivery catheter layer 1 and a delivery catheter segment 2. The delivery catheter layer 1 includes a delivery layer 11, a supporting skeleton layer 12, and a protective layer 13, and the delivery catheter layer 1 is arranged from the inside out with the delivery layer 11, the supporting skeleton layer 12, and the protective layer 13 arranged sequentially. The delivery catheter segment 2 includes a bidirectional bending segment 21, a bending adaptation segment 22, and a straight support segment 23, and the delivery catheter segment 2 is arranged from the beginning to the end with the bidirectional bending segment 21, the bending adaptation segment 22, and the straight support segment 23. The bidirectional bending segment 21, the bending adaptation segment 22, and the straight support segment 23 are all arranged from the inside out with the delivery layer 11, the supporting skeleton layer 12, and the protective layer 13 arranged sequentially. The supporting skeleton layer 12 on the bidirectional bending segment 21, the bending adaptation segment 22, and the straight support segment 23 all adopt a perforated mesh structure.

[0076] The conveying layer 11 is made of PTFE, the support frame layer 12 is made of stainless steel, and the protective layer 13 is made of PTFE. The support frame layer 12 includes support frame layer one 121, support frame layer two 122, and support frame layer three 123. Support frame layer one 121 is installed on the bidirectional bending section 21, and support frame layer one 121 has an elliptical perforated mesh structure. Support frame layer two 122 is installed on the bending adaptation section 22, and support frame layer two 122 has a wavy perforated mesh structure. Support frame layer three 123 is installed on the straight section support section 22, and support frame layer three 123 has a trapezoidal perforated mesh structure. Support frame layer one 121 includes multiple elliptical cut layers 1211, which are symmetrically arranged on both sides of support frame layer one 121. Support frame layer two 122 includes multiple wavy cut lines 1221, which are evenly and densely distributed on the surface of support frame layer two 122.

[0077] The supporting skeleton layer 3 123 includes multiple isosceles trapezoidal cut lines 1231, which together form a single rhomboid cut line unit 1232. These rhomboid cut line units 1232 are evenly arranged on the surface of the supporting skeleton layer 3 123. The bidirectional bending section 21 has a bending angle range of 0° to 200° and bends to the left or right. The bidirectional bending section 21, the bending adaptation section 22, and the straight support section 23 are integrally formed and connected in sequence. The medical delivery catheter is a cylindrical medical delivery catheter.

[0078] Specifically, in this embodiment, as shown in the appendix Figure 3 and attached Figure 4 As shown, the delivery layer 11 can also be made of polymer materials such as FEP, PEBAX, and PA, which can provide a smooth channel for the delivery of implants or other embedded catheters, facilitating the smooth progress of the surgery.

[0079] Specifically, in this embodiment, as shown in the appendixFigure 3 and attached Figure 4 As shown, the supporting skeleton layer 12 can also be made of nickel-titanium alloy, nickel alloy, titanium alloy or other alloy materials to ensure the support strength, torsional strength and bending strength of the catheter, which is conducive to the smooth operation of the surgery.

[0080] Specifically, in this embodiment, as shown in the appendix Figure 3 and attached Figure 4 As shown, the protective layer 13 can also be made of polymer materials such as PTFE, FEP, PEBAX, PA, etc., which can cover the supporting skeleton layer 12 and prevent the supporting skeleton layer 12 from being exposed and corroded. At the same time, the catheter can be more easily inserted and delivered in human blood vessels through the smooth and uniform outer surface of the protective layer 13, which is conducive to the smooth operation of the surgery.

[0081] Specifically, in this embodiment, as shown in the appendix Figure 5 As shown, the bidirectional bending section 21, with its bending angle range of 0–200°, facilitates the movement of the catheter tip during surgical procedures. Figure 5 As shown, the angle and direction can be adjusted according to the specific situation to improve ease of use and facilitate the smooth progress of the surgery.

[0082] Specifically, in this embodiment, as shown in the appendix Figure 8 As shown, the bending adaptation section 22 can provide strong support and torsional resistance for the catheter. At the same time, the bending adaptation section 22 also has good bending adaptability, which can ensure that the catheter of the present invention can be adaptively shuttled and delivered in other lumens or blood vessels, which is conducive to the smooth operation of the surgery.

[0083] Specifically, in this embodiment, as shown in the appendix Figure 11 As shown, the straight support section 23 can ensure the strong support and torsional resistance of the catheter of the present invention, ensure the stability of the catheter during delivery, prevent easy deformation, and facilitate the smooth operation of the surgery.

[0084] Specifically, in this embodiment, as shown in the appendix Figure 14 As shown, existing medical delivery catheters have a "bow-back" feature. This "bow-back" technical problem hinders stable delivery during surgery, creating surgical risks and increasing the probability of surgical accidents. However, as shown in the attached diagram... Figure 15 As shown, by using a hollow mesh structure instead of the braided wire structure currently available on the market, the medical delivery catheter of this invention provides stronger support and torsional resistance, which can solve the "bowback" technical problem existing in existing catheters. That is, the medical delivery catheter of this invention does not have the "bowback" technical problem.

[0085] Specifically, in this embodiment, as shown in the appendix Figures 5-13 As shown, the hollow mesh structure on the bidirectional bending section 21, the bending adaptation section 22, and the straight section support section 23 is all processed by laser cutting.

[0086] Specifically, in this embodiment, as shown in the appendix Figure 7 As shown, multiple elliptical cut layers 1211 are centrally arranged in the support skeleton layer 121, and the multiple elliptical cut layers 1211 are arranged in parallel side by side. Multiple small elliptical holes 1213 are arranged on the left side of each elliptical cut layer 1211, and the multiple small elliptical holes 1213 are also arranged in parallel side by side.

[0087] Furthermore, multiple large elliptical holes 1214 are provided on one side of the support skeleton layer 121, and multiple concave grooves 1215 are provided on the other side of the support skeleton layer 121.

[0088] Furthermore, multiple semi-elliptical cut layers 1212 are provided on the support skeleton layer 121. The multiple semi-elliptical cut layers 1212 are symmetrically arranged on the upper and lower sides of the support skeleton layer 121. U-shaped grooves 1216 are also provided on the upper and lower sides of the support skeleton layer 121. The U-shaped grooves 1216 are symmetrically arranged on the upper and lower sides.

[0089] Furthermore, multiple elliptical cutting layers 1211 are equidistant from each other, multiple semi-elliptical cutting layers 1212 are equidistant from each other, and multiple small elliptical holes 1213 are equidistant from each other.

[0090] Specifically, in this embodiment, as shown in the appendix Figure 10 As shown, the wavy cut pattern 1221 includes long wavy cut patterns 12211 and short wavy cut patterns 12212. Multiple long wavy cut patterns 12211 are centrally arranged in the support skeleton layer 2 122, and the multiple long wavy cut patterns 12211 are arranged in parallel side by side. Multiple small elliptical holes 2 1222 are arranged on the left side of each long wavy cut pattern 12211, and the multiple small elliptical holes 2 1222 are also arranged in parallel side by side.

[0091] Furthermore, multiple large elliptical holes 1223 and multiple long elliptical holes 1224 are provided on one side of the support skeleton layer 122, and multiple concave grooves 1225 are provided on the other side of the support skeleton layer 122.

[0092] Furthermore, multiple short wavy cut lines 12212 are symmetrically arranged on the upper and lower sides of the second support skeleton layer 122, and U-shaped grooves 1226 are also provided on the upper and lower sides of the second support skeleton layer 122, with the U-shaped grooves 1226 being symmetrically arranged.

[0093] Furthermore, multiple long wavy cut lines 12211 are equidistant from each other, multiple short wavy cut lines 12212 are equidistant from each other, and multiple small elliptical holes 1222 are equidistant from each other.

[0094] Specifically, in this embodiment, as shown in the appendix Figure 13As shown, multiple diamond-shaped cut pattern units 1232 are centrally arranged in the support skeleton layer 3 123, and the multiple diamond-shaped cut pattern units 12321 are arranged in parallel side by side.

[0095] Furthermore, multiple round holes 1233 are provided on one side of the support skeleton layer 3 123, and multiple elongated elliptical holes 1234 are provided on the other side of the support skeleton layer 1 121.

[0096] Furthermore, the supporting skeleton layer 3 has multiple isosceles trapezoidal cut patterns 1231 symmetrically arranged on both the upper and lower sides.

[0097] Furthermore, the multiple isosceles trapezoidal cut patterns 1231 on the upper and lower sides of the supporting skeleton layer 3 123 are equidistantly arranged, and the multiple rhomboid cut pattern units 1232 are equidistantly arranged.

[0098] Example 2

[0099] The straight support section 23 of the medical delivery catheter of the present invention can also be as shown in the appendix. Figures 16-19 The support skeleton layer 123' shown is different from the support skeleton layer 123 in Embodiment 1 in that the support skeleton layer 123' in Embodiment 2 adopts a slender elliptical hollow mesh structure.

[0100] Example 3

[0101] The straight support section 23 of the medical delivery catheter of the present invention can also be as shown in the appendix. Figures 20-21 The difference between the support skeleton layer 3 "123" shown in Example 3 and the support skeleton layer 3 "123" in Example 1 is that the support skeleton layer 3 "123" in Example 3 adopts an S-shaped hollow mesh structure.

[0102] Example 4

[0103] The straight support section 23 of the medical delivery catheter of the present invention can also be as shown in the appendix. Figures 22-23 The support skeleton layer 123”’ shown is different from the support skeleton layer 123”’ in Example 1 in that the support skeleton layer 123”’ shown in Example 4 adopts a V-shaped hollow mesh structure.

[0104] Working principle:

[0105] The catheter of this invention is divided into three sections: a bidirectional bending section 21, a bending adaptation section 22, and a straight support section 23. Each of the three sections includes a delivery layer 11, a support skeleton layer 12, and a protective layer 13. The three support skeleton layers in the catheter of this invention have elasticity through a hollow mesh structure, replacing the braided wire structure currently available on the market. This provides stronger support and torsional resistance to the catheter of this invention, solving the "bowback" technical problem existing in current catheters, and also solving the problem of insufficient pushing force during the catheter's movement.

[0106] Specifically, in this invention, the bidirectional bending section uses an elliptical hollow mesh structure with bending elasticity to support the skeleton layer, which allows the first section of the catheter to bend to the left or right within a bending angle range of 0 to 200 degrees. This makes it convenient for the catheter tip to adjust the bending angle direction according to the specific situation during the operation, improving ease of use and facilitating the smooth progress of the operation.

[0107] Specifically, in this invention, the bending adaptation section uses a wave-shaped perforated mesh structure with bending elasticity to support the skeleton layer, so that the second section of the catheter has bending adaptability. In any direction, the second section of the catheter has bending toughness and strong support strength, which is conducive to the smooth operation of the operation.

[0108] Specifically, in this invention, the straight support section uses a trapezoidal hollow mesh structure with bending elasticity to support the skeleton layer, ensuring that the third section of the catheter has support and torsional resistance, thereby ensuring that the catheter will not easily deform during delivery, maintaining stability, and facilitating the smooth progress of surgery.

[0109] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0110] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A medical delivery catheter, characterized by, The medical delivery catheter comprises a delivery catheter layer (1) and a delivery catheter section (2), the delivery catheter layer (1) comprises a delivery layer (11), a support framework layer (12) and a protective layer (13), and the delivery catheter layer (1) is sequentially provided with the delivery layer (11), the support framework layer (12) and the protective layer (13) from inside to outside; The delivery catheter section (2) comprises a two-way bending section (21), a bending adaptation section (22) and a straight section support section (23), and the delivery catheter section (2) is sequentially provided with the two-way bending section (21), the bending adaptation section (22) and the straight section support section (23) from head to tail; And the two-way bending section (21), the bending adaptation section (22) and the straight section support section (23) are sequentially provided with the delivery layer (11), the support framework layer (12) and the protective layer (13) from inside to outside; And the support framework layer (12) on the two-way bending section (21), the bending adaptation section (22) and the straight section support section (23) adopts a hollow mesh structure.

2. The medical delivery catheter of claim 1, wherein, The delivery layer (11) comprises a PTFE material delivery layer, the support framework layer (12) comprises a stainless steel material support framework layer, and the protective layer (13) comprises a PTFE material protective layer.

3. The medical delivery catheter of claim 1, wherein, The support framework layer (12) comprises a support framework layer one (121), a support framework layer two (122) and a support framework layer three (123); The support framework layer one (121) is arranged on the two-way bending section (21) and comprises an elliptical hollow mesh structure; The support framework layer two (122) is arranged on the bending adaptation section (22) and comprises a wave-shaped hollow mesh structure; The support framework layer three (123) is arranged on the straight section support section (22) and comprises a trapezoidal-shaped hollow mesh structure.

4. The medical delivery catheter of claim 3, wherein, The support framework layer one (121) comprises a plurality of elliptical cutting layers (1211), and the plurality of elliptical cutting layers (1211) are symmetrically arranged on both sides of the support framework layer one (121); The support framework layer two (122) comprises a plurality of wave-shaped cutting lines (1221), and the plurality of wave-shaped cutting lines (1221) are uniformly and densely arranged on the surface of the support framework layer two (122); The support framework layer three (123) comprises a plurality of isosceles trapezoidal cutting lines (1231), and the plurality of isosceles trapezoidal cutting lines (1231) form a single rhombus cutting line unit (1232), and the plurality of rhombus cutting line units (1232) are uniformly arranged on the surface of the support framework layer three (123).

5. The medical delivery catheter of claim 1, wherein, The two-way bending section (21) is arranged to have a bending angle range of 0°-200°, and the two-way bending section (21) is arranged to bend to the left or to the right.

6. The medical delivery catheter of claim 1, wherein, The two-way bending section (21), the bending adaptation section (22) and the straight section support section (23) are sequentially and integrally connected.

7. The medical delivery catheter of claim 1, wherein, The medical delivery catheter comprises a cylindrical medical delivery catheter.

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