Extended guiding catheter

Abstract

The utility model relates to an extended guide catheter. The extended guiding catheter comprises a base, a catheter body, a balloon and an end head, one end of the pipe body is connected with the base, a first pipe cavity and a second pipe cavity are formed in the pipe body, the first pipe cavity is communicated with the base, a first through hole is formed in the surface of the pipe body, and the first through hole is communicated with the second pipe cavity; the balloon is connected with the end, away from the base, of the tube body, the tube body is sleeved with the balloon, and the balloon is communicated with the first tube cavity. The end is connected with the end, away from the base, of the tube body, a second through hole is formed in the end and communicated with the second tube cavity, and the second through hole and the first through hole are located on the two opposite sides of the balloon respectively. According to the scheme, when the balloon expands in the blood vessel, blood in the blood vessel can flow normally.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to extended guiding catheters. Background Technology

[0002] In existing technical solutions, Chinese patent CN114010921A discloses an extended guiding catheter with anchoring function, which achieves stable support by fixing a balloon to the distal end of the extended guiding catheter. In all embodiments of this solution, the balloon needs to be inflated and anchored in the blood vessel to obtain stable support. However, while the balloon is inflated, it also blocks the forward blood flow of the blood vessel. Since the blood vessel cannot be blocked for a long time, this solution cannot be used for a long time, and it also cannot be deeply inserted into the distal end of the blood vessel. Patent solution CN219398628U discloses a conventional extended guiding catheter with a side hole in the tube body, which can improve blood flow while using the extended guiding catheter. However, as a conventional extended guiding catheter, its overall support effect is lower than that of the extended guiding catheter with a balloon at the distal end. Utility Model Content

[0003] To address or partially address the problems existing in the related technologies, this application provides an extended guiding catheter that allows blood to flow normally in the blood vessel when the balloon is expanded.

[0004] This application provides an extended guiding catheter, comprising a base, a tube body, a balloon, and a tip; one end of the tube body is connected to the base, the tube body has a first lumen and a second lumen, the first lumen is connected to the base, and a first through hole is formed on the surface of the tube body, the first through hole being connected to the second lumen; the balloon is connected to the end of the tube body away from the base, the balloon is fitted outside the tube body, and the balloon is connected to the first lumen; the tip is connected to the end of the tube body away from the base, the tip has a second through hole, the second through hole being connected to the second lumen, and the second through hole and the first through hole are respectively located on opposite sides of the balloon.

[0005] Furthermore, the tube body includes a connecting tube and an outer tube. One end of the outer tube is connected to the connecting tube, and the other end of the outer tube is connected to the end cap. The connecting tube is connected to both the base and the outer tube. The balloon is connected to the outer tube. The first through hole is located on the outer tube. The hardness of the connecting tube is greater than that of the outer tube.

[0006] Furthermore, the extended guiding catheter also includes a push rod, one end of which is connected to the connecting tube, and the push rod is located inside the outer tube.

[0007] Furthermore, the extended guiding catheter also includes a protective tube located within the catheter body, surrounding the second lumen, and one end of the protective tube is connected to the end tip.

[0008] Furthermore, the extended guiding catheter also includes a metal support layer located inside the tube body and sleeved outside the protective tube.

[0009] Furthermore, the metal support layer is a spring or a woven mesh sleeve.

[0010] Furthermore, the protective tube has a through hole corresponding to the first through hole, and the through hole is connected to the first through hole.

[0011] Furthermore, the first cavity and the protective tube are spaced apart.

[0012] Furthermore, the extended guiding catheter also includes an injection tube, in which the first lumen is formed, one end of the injection tube is inside the tubing body, and the other end of the injection tube is located inside the balloon.

[0013] Furthermore, the tube body has an instrument inlet, which is connected to the second lumen.

[0014] The technical solution provided in this application can include the following beneficial effects: by setting a second lumen in the tube body, the second lumen is connected to the first through hole and the second through hole respectively, and the first through hole and the second through hole are located on opposite sides of the balloon, so that when the balloon expands in the blood vessel, the blood in the blood vessel can flow through the second lumen, avoiding the blood being blocked by the balloon and thus preventing the blood in the blood vessel from not flowing, which can support the long-term anchoring of the balloon to the greatest extent, as well as support the deep insertion of the tube body and entry into the distal blood vessel; this application can not only provide strong support for the delivery of the device in the extended guiding catheter by anchoring the balloon in the blood vessel, but also improve forward blood flow while the balloon is anchored for a long time. This application addresses the problem of reverse movement of the extended guiding catheter within the blood vessel during PCI surgery due to insufficient support or cardiac rhythm. Anchoring the balloon on the extended guiding catheter within the blood vessel prevents its retraction during high-resistance instrument delivery, facilitating subsequent instrument delivery and providing a more convenient surgical environment. Furthermore, improved blood flow between the second and first access ports alleviates the blood flow obstruction caused by the balloon anchoring, allowing for more time for instrument delivery. The extended guiding catheter of this application is less likely to damage blood vessels or cause myocardial ischemia, ensuring a smooth surgical procedure. It should be understood that the above general description and the following detailed description are exemplary and explanatory only and do not limit this application. Attached Figure Description

[0015] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0016] Figure 1 This is a schematic diagram of the structure of the extended guiding catheter shown in the embodiments of this application;

[0017] Figure 2 This is a cross-sectional view of the extended guiding catheter shown in the embodiments of this application;

[0018] Figure 3 yes Figure 2 A magnified view of part E in the image;

[0019] Figure 4 yes Figure 2 A magnified view of part of F;

[0020] Figure 5 yes Figure 1 A cross-sectional view along the AA direction;

[0021] Figure 6 yes Figure 1 A cross-sectional view along the BB direction;

[0022] Figure 7 yes Figure 1 A cross-sectional view along the CC direction;

[0023] Figure 8 yes Figure 1 A cross-sectional view along the DD direction.

[0024] Reference numerals: Base 1; Tube body 2; First lumen 21; Second lumen 22; First through hole 23; Connecting tube 24; Liquid outlet 241; Outer tube 25; Instrument inlet 26; Balloon 3; End 4; Second through hole 41; Push rod 5; Protective tube 6; Metal support layer 7; Injection tube 8. Detailed Implementation

[0025] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0026] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0027] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "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, and 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, and therefore should not be construed as a limitation of this application.

[0028] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] To address the aforementioned issues, this application provides an extended guiding catheter that allows blood to flow normally within the blood vessel when the balloon expands.

[0030] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0031] Figure 1 This is a schematic diagram of the structure of the extended guiding catheter shown in the embodiments of this application.

[0032] See Figure 1 The extended guiding catheter includes a base 1, a tube body 2, a balloon 3, and a tip 4. The tube body 2 can be partially inserted into the blood vessel. During the process of the balloon 3 expanding and blocking the blood vessel, blood can flow in the tube body 2.

[0033] Figure 2 This is a cross-sectional view of the extended guiding catheter shown in the embodiments of this application; Figure 3 yes Figure 2 A magnified view of part E in the image.

[0034] See Figure 2 and Figure 3 The base 1 has a Luer connector, and one end of the tube 2 is connected to the base 1. The tube 2 has a first lumen 21 and a second lumen 22. Liquid can flow in the first lumen 21, and blood in the blood vessel can flow in the second lumen 22. The first lumen 21 is connected to the base 1, and liquid can flow from the base 1 into the first lumen 21. A first through hole 23 is opened on the surface of the tube 2, and the first through hole 23 is connected to the second lumen 22. When the tube 2 is inserted into the blood vessel, blood in the blood vessel can enter the second lumen 22 through the first through hole 23. There are multiple first through holes 23, preferably twenty, and the diameter of the first through hole 23 is 0.5 mm.

[0035] See Figure 2 and Figure 3 The balloon 3 is connected to the end of the tube 2 furthest from the base 1. The balloon 3 is fitted over the tube 2 and is connected to the first lumen 21. When it is necessary to inflate the balloon 3, liquid is injected into the base 1. The liquid enters the first lumen 21 from the base 1 and then flows along the first lumen 21 to the balloon 3. The amount of liquid in the balloon 3 increases, and the balloon 3 inflates, thereby achieving inflation. The liquid used to inflate the balloon 3 can be a mixture of physiological saline and / or contrast agent. The maximum diameter of the balloon 3 is 1.5–4.5 mm.

[0036] See Figure 2 and Figure 3 The end 4 is connected to the end of the tube body 2 away from the base 1. The end 4 has a second through hole 41, which communicates with the second lumen 22. The second through hole 41 and the first through hole 23 are located on opposite sides of the balloon 3, and the path from the second lumen 22 to the end 4 passes through the balloon 3. When the tube body 2 is inserted into the blood vessel, blood can flow from the first through hole 23 into the second lumen 22, then from the second lumen 22 into the end 4, and then back into the blood vessel through the second through hole 41. During the expansion of the balloon 3, the balloon 3 may block the blood vessel, preventing blood from flowing normally in the gap between the blood vessel and the balloon 3. In this case, blood can enter the second lumen 22 through the first through hole 23, pass through the second lumen 22 and the end 4, and flow back into the blood vessel.

[0037] This application provides a second lumen 22 within the tube body 2, which is connected to the first through hole 23 and the second through hole 41 respectively. The first through hole 23 and the second through hole 41 are located on opposite sides of the balloon 3. This allows blood in the blood vessel to flow through the second lumen 22 when the balloon 3 expands in the blood vessel, preventing blood from being blocked by the balloon 3 and thus preventing blood from being unable to flow in the blood vessel. This can maximize the support for long-term anchoring of the balloon 3 and support the deep insertion of the tube body 2 into distal blood vessels. This application can provide strong support for the delivery of the device in the extended guiding catheter by anchoring the balloon 3 in the blood vessel, and can also improve forward blood flow while the balloon 3 is anchored for a long time. This application addresses the problem of reverse movement of the extended guiding catheter within the blood vessel during PCI surgery due to insufficient support or cardiac rhythm, without affecting blood flow. Anchoring the balloon 3 on the extended guiding catheter within the blood vessel prevents its retraction during high-resistance instrument delivery, facilitating subsequent instrument delivery and providing a more convenient surgical environment. Furthermore, improved blood flow between the second port 41 and the first port 23 alleviates the blood flow obstruction caused by the balloon 3 anchored within the vessel, providing the surgeon with more time for instrument delivery and a more flexible surgical period. The extended guiding catheter of this application is less likely to damage blood vessels or cause myocardial ischemia, ensuring a smooth surgical procedure.

[0038] Figure 4 yes Figure 2 A magnified view of part F.

[0039] See Figure 2 and Figure 4 The tube body 2 includes a connecting tube 24 and an outer tube 25. One end of the outer tube 25 is connected to the connecting tube 24, and the other end of the outer tube 25 is connected to the end 4. The connecting tube 24 is connected to both the base 1 and the outer tube 25. The balloon 3 is connected to the outer tube 25. A first through hole 23 is provided in the outer tube 25. The connecting tube 24 is harder than the outer tube 25. The connecting tube 24 is a hollow metal tube, preferably a hypo tube made of materials such as nickel-titanium alloy or stainless steel. The outer tube 25 is made of a high-molecular-weight polymer. Since the connecting tube 24 does not need to be inserted into the blood vessel, while the outer tube 25 needs to be inserted, the outer tube 25 is softer to avoid damaging the blood vessel, while the connecting tube 24 is harder, making it easier for medical personnel to operate on it.

[0040] Figure 5 yes Figure 1 A cross-sectional view along the AA direction.

[0041] See Figure 4 and Figure 5The extended guiding catheter also includes a push rod 5, one end of which is connected to the connecting tube 24. The push rod 5 is located inside the outer tube 25 and provides strength support for the outer tube 25, making it less prone to bending when passing through the blood vessel. Preferably, the push rod 5 is made of materials such as stainless steel 304 or stainless steel 316.

[0042] Figure 6 yes Figure 1 A cross-sectional view along the BB direction.

[0043] See Figure 3-6 In some embodiments, the push rod 5 is a solid rod, and the surface of the connecting tube 24 has a liquid outlet 241 in the radial direction of the connecting tube 24. One end of the outer tube 25 is fused to the surface of the connecting tube 24, and the liquid outlet 241 is located inside the outer tube 25. When it is necessary to expand the balloon 3, the liquid can enter the outer tube 25 from the inside of the connecting tube 24 through the liquid outlet 241.

[0044] In some embodiments, one end of the outer tube 25 can be fused to the surface of the connecting tube 24 or the surface of the push rod 5. The end of the push rod 5 connected to the connecting tube 24 is provided with an infusion hole. The surface of the push rod 5 is provided with an outlet 241 in the radial direction of the push rod 5. The outlet 241 is located inside the outer tube 25. The infusion hole and the outlet 241 are connected. When it is necessary to expand the balloon 3, the liquid enters the infusion hole from the port of the connecting tube 24 and then enters the outer tube 25 through the outlet 241.

[0045] Figure 7 yes Figure 1 A cross-sectional view along the CC direction.

[0046] See Figure 1 , Figure 2 and Figure 7 The extended guiding catheter also includes an inner tube 6, a protective tube 6 located inside the tube body 2, and surrounding the second lumen 22. One end of the protective tube 6 is connected to the end cap 4. The protective tube 6 is made of HDPE or PTFE and provides a smooth inner lumen channel for instrument delivery of the extended guiding catheter. The axial distance between two adjacent first through holes 23 in the tube body 2 is 1 cm, and the two adjacent first through holes 23 are spirally distributed at an angle R in the radial direction of the tube body 2, where the angle R can be 120°.

[0047] Figure 8 yes Figure 1 A cross-sectional view along the DD direction.

[0048] See Figure 1 , Figure 2 , Figure 7 and Figure 8In some embodiments, the extended guiding catheter further includes a metal support layer 7, which is located in the middle layer and is sleeved over the protective tube 6. The metal support layer 7 can further prevent the second lumen 22 from being squeezed when the balloon 3 expands. The metal support layer 7 is a spring or a braided mesh sleeve, which can make the protective tube 6 more radially resistant to pressure and will not affect the small-amplitude bending of the protective tube 6, making it easier for the outer tube 25 to extend and retract in the blood vessel. In some embodiments, the end of the protective tube 6 away from the tip 4 is connected to the push rod 5, and the metal support layer 7 is connected to the push rod 5. The push rod 5 can reinforce the protective tube 6 and the metal support layer 7, and make the hardness of the outer tube 25 have a gradient change, so that the hardness of the outer tube 25 is smaller on the side closer to the tip 4, which is more conducive to the passage of the outer tube 25 near the base 1 in the blood vessel. The outer tube 25 near the balloon 3 is less likely to cause damage to the blood vessel.

[0049] See Figure 1 and Figure 2 The tube body 2 has an instrument inlet 26, specifically, the instrument inlet 26 is located on the outer tube 25; the instrument inlet 26 is connected to the second lumen 22, and instruments such as guidewires, microcatheters, PTCA balloon catheters or stents can pass through the instrument inlet 26 into the second lumen 22 and reach the end 4 along the second lumen 22; in order to avoid the instrument inlet 26 affecting the structural strength of the outer tube 25, the thickness of the outer tube 25 at the instrument inlet 26 is greater than that of the outer tube 25 at the metal support layer 7.

[0050] See Figure 1-3 In some embodiments, in order to avoid the outer tube 25 becoming weaker due to the first through hole 23, the first through hole 23 is located radially on the protective tube 6 and outside the mesh of the woven mesh sleeve. The protective tube 6 and the metal support layer 7 can strengthen the outer tube 25 where the first through hole 23 is located. The protective tube 6 has a through hole corresponding to the first through hole 23, and the through hole is connected to the first through hole 23 to ensure that blood in the blood vessel can enter the second lumen 22.

[0051] In some embodiments, the first through hole 23 is located between the protective tube 6 and the instrument inlet 26, and the thickness of the outer tube 25 at the first through hole 23 is greater than that at the protective tube 6, to ensure that the outer tube 25 at the first through hole 23 has sufficient structural strength.

[0052] See Figure 1-4 In some embodiments, the first cavity 21 is located on one side of the push rod 5. The first cavity 21 is independent of the protective tube 6 and is separated from the protective tube 6. The second cavity 22 is independent of the first cavity 21. When liquid passes through the first cavity 21, the second cavity 22 is protected by the outer tube 25 and the metal support layer 7. The liquid in the first cavity 21 will not cause the second cavity 22 to be blocked due to squeezing the second cavity 22.

[0053] In some embodiments, a first cavity 21 may be formed inside the push rod 5, and liquid can enter the first cavity 21 inside the push rod 5 from the connecting tube 24; a liquid injection tube is provided on one side of the protective tube 6, and the liquid injection tube is connected to the first cavity 21 inside the push rod 5 and the balloon 3 respectively, and liquid can enter the liquid injection tube from the first cavity 21 inside the push rod 5, and then enter the balloon 3 from the liquid injection tube.

[0054] See Figure 2-6 In some embodiments, the extended guiding catheter further includes an injection tube 8, which forms a first lumen 21. One end of the injection tube 8 is located inside the tube body 2, and the other end is located inside the balloon 3. The injection tube 8 extends from the end near the connecting tube 24 into the balloon 3, and is located on one side of the push rod 5 and the second lumen 22. By setting the injection tube 8 to independently deliver liquid, leakage of liquid in the first lumen 21 can be avoided, and the pressure on the second lumen 22 when liquid is delivered in the first lumen 21 can be reduced. The injection tube 8 can be made of polyimide polymer material.

[0055] In some embodiments, the gap between the outer tube 25 and the push rod 5 can form a first cavity 21, and the gap between the outer tube 25 and the metal support layer 7 can also form a first cavity 21. Since the first cavity 21 is in the gap between the outer tube 25 and the metal support layer 7, the instrument inlet 26 is not connected to the first cavity 21, so the first cavity 21 will not affect the second cavity 22.

[0056] The solution of this application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have different focuses; for parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also understand that the actions and modules involved in the specification are not necessarily essential to this application. Furthermore, it is understood that the steps in the method of this application embodiment can be adjusted, combined, and deleted according to actual needs, and the modules in the device of this application embodiment can be combined, divided, and deleted according to actual needs.

[0057] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. An extension guide catheter, comprising: The utility model provides a kind of medical device, including: Base; Pipe body, one end of the pipe body is connected with the base, first lumen and second lumen are provided in the pipe body, the first lumen is communicated with the base, first through-hole is opened on the surface of the pipe body, and the first through-hole is communicated with the second lumen; Balloon, the balloon is connected with the one end of the pipe body away from the base, the balloon is sleeved outside the pipe body, and the balloon is communicated with the first lumen; Tip, the tip is connected with the one end of the pipe body away from the base, second through-hole is opened in the tip, the second through-hole is communicated with the second lumen, and the second through-hole and the first through-hole are located on the opposite sides of the balloon respectively.

2. The extension guide catheter of claim 1, wherein: The pipe body includes connecting pipe and outer tube, one end of the outer tube is connected with the connecting pipe, the other end of the outer tube is connected with the tip, the connecting pipe is communicated with the base and the outer tube respectively, the balloon is connected with the outer tube, the first through-hole is located on the outer tube, and the hardness of the connecting pipe is greater than the hardness of the outer tube.

3. The extension guide catheter of claim 2, wherein: It also includes push rod, one end of the push rod is connected with the connecting pipe, and the push rod is located in the outer tube.

4. The extension guide catheter of claim 1, wherein: It also includes protective tube, the protective tube is located in the pipe body, the protective tube surrounds the second lumen, and one end of the protective tube is connected with the tip.

5. The extension guide catheter of claim 4, wherein: It also includes metal support layer, the metal support layer is located in the pipe body, and the metal support layer is sleeved outside the protective tube.

6. The extension guide catheter of claim 5, wherein: The metal support layer is spring or woven mesh sleeve.

7. The extension guide catheter of claim 4, wherein: The protective tube is provided with through-hole corresponding to the first through-hole, and the through-hole is communicated with the first through-hole.

8. The extension guide catheter of claim 4, wherein: The first lumen is arranged apart from the protective tube.

9. The extension guide catheter of claim 1, wherein: It also includes injection tube, the first lumen is formed in the injection tube, one end of the injection tube is in the pipe body, and the other end of the injection tube is located in the balloon.

10. The extension guide catheter of claim 1, wherein: The pipe body is provided with instrument inlet, and the instrument inlet is communicated with the second lumen.

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