Balloon Catheter

Abstract

The invention discloses a balloon catheter, comprising a tube seat, an outer tube, an inner tube and a balloon, wherein the outer tube is connected to the tube seat, the proximal end of the inner tube is biased toward one side of the inner wall of the outer tube and connected to the inner wall of the outer tube and penetrates the inner wall of the outer tube, the distal end of the inner tube extends out of the distal end of the outer tube, the balloon is arranged between the distal end of the outer tube and the distal end of the inner tube, a guide wire channel for a guide wire to pass through is formed inside the inner tube, a filling channel for balloon filling is formed between the outer part of the inner tube and the inner part of the outer tube, the outer tube comprises a first tube body and a second tube body connected in sequence from the proximal end to the distal end, the proximal end of the second tube body is fixed to the outside of the first tube body and the distal end of the first tube body is covered therein, the proximal end of the first tube body is formed as a fixed end and fixedly connected to the tube seat, the distal end of the first tube body is formed as a free end and contacts the inner tube connected to the inner wall of the second tube body after being extended into the second tube body. In this way, the mechanical strength of the connection between the inner tube and the second tube body is effectively enhanced, and bending of the connection can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a balloon catheter. Background Art

[0002] Balloon catheters are an indispensable medical device in interventional treatment, mainly used for dilating narrowed blood vessels or placing stents. Balloon catheters are composed of multiple key parts, including a guidewire channel and a balloon filling channel. The former is used to insert the guidewire to enter the blood vessel under the guidance of the guidewire and ensure that the balloon catheter can accurately reach the target position, while the latter is used to connect an external pressure pump or syringe to fill the balloon, thereby achieving effective dilation of the narrow part or stable placement of the stent.

[0003] In the design of balloon catheters, there are currently two main technical solutions for the layout of the guidewire channel and the balloon filling channel. The first is the traditional dual-interface design, which sets two independent interfaces on the catheter seat, one for the guidewire channel and the other for the balloon filling channel. Although this design can meet basic clinical needs, due to the complexity of the structure, it not only increases the overall size of the catheter seat, but also may affect the convenience of operation.

[0004] In response to the above challenges, subsequent designs introduced a more optimized single-interface solution. In this solution, the entrance of the guidewire channel is cleverly set on the side wall of the outer tube of the balloon catheter, while the entrance of the balloon filling channel is still retained on the catheter seat. For example, the balloon catheter shown in Chinese invention patent CN108778391A adopts such an innovative design: by using the hollow part of the inner tube as the guidewire channel, and offsetting the proximal end of the inner tube to the side of the outer tube and connecting to the inner wall of the outer tube, it finally penetrates the side wall of the outer tube to form the entrance of the guidewire channel. Such a design not only simplifies the number of interfaces and the structure of the catheter seat, but also improves the convenience of operation.

[0005] However, this single-interface design is not perfect. Especially in complex situations such as curved or narrow blood vessels, the fragility of the connection between the inner tube and the outer tube becomes an issue that cannot be ignored. Since the strength of this connection is relatively low, it is easy to bend when encountering a large external force, thus affecting the overall passability and operational stability of the balloon catheter. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a balloon catheter in view of the above-mentioned defects in the prior art.

[0007] According to the present invention, a balloon catheter is provided, comprising a tube seat, an outer tube, an inner tube and a balloon, wherein the outer tube is connected to the tube seat, the proximal end of the inner tube is offset to one side of the inner wall of the outer tube and is connected to the inner wall of the outer tube and penetrates the inner wall of the outer tube, the distal end of the inner tube extends out of the distal end of the outer tube, the balloon is arranged between the distal end of the outer tube and the distal end of the inner tube, a guide wire channel for a guide wire to pass through is formed inside the inner tube, a filling channel for filling the balloon is formed between the outside of the inner tube and the inside of the outer tube, the outer tube comprises a first tube body and a second tube body connected in sequence from the proximal end to the distal end, the proximal end of the second tube body is fixed to the outside of the first tube body and the distal end of the first tube body is covered therein, the proximal end of the first tube body is formed as a fixed end and is fixedly connected to the tube seat, the distal end of the first tube body is formed as a free end and contacts the inner tube connected to the inner wall of the second tube body after extending into the second tube body.

[0008] Furthermore, the connection between the second tube body and the first tube body is close to the distal end of the first tube body, and the distal end of the first tube body does not contact the inner wall of the second tube body after extending into the second tube body.

[0009] Furthermore, the proximal end of the second tube body is formed into a cone with a small proximal end and a large distal end, and the conical small end of the proximal end of the second tube body is fixed to the outer surface of the first tube body by fusion, welding or bonding.

[0010] Furthermore, the end surface of the distal end of the first tube body is formed as a beveled surface, and the tip of the beveled surface extends toward the distal end to form an extended section in contact with the inner tube.

[0011] Furthermore, the extension section is formed in an arc shape.

[0012] Furthermore, the distal end of the extension section is a free end and is located in the second tube body.

[0013] Furthermore, the distal end of the extension section is a fixed end and is fixedly connected to the distal end of the inner tube after extending out of the distal end of the second tube body.

[0014] Furthermore, a traction wire is provided in the first tube body, and the distal end of the traction wire extends along the inner wall of the extension section to the distal end of the inner tube and is fixedly connected to the distal end of the inner tube.

[0015] Furthermore, the proximal end of the traction wire extends out of the proximal end of the tube seat.

[0016] Furthermore, the extension section is spirally coiled around the outer wall of the inner tube, and the traction wire is tightly attached to the outer wall of the inner tube.

[0017] Compared with the prior art, the present invention sets the outer tube as the first tube body and the second tube body, and the proximal end of the inner tube is directly connected to the side wall of the second tube body after offset treatment and penetrates the side wall of the second tube body to form an entrance of the guidewire channel, while the distal end of the first tube body extends into the second tube body to form a free end and contacts the inner tube connected to the inner wall of the second tube body. This effectively enhances the mechanical strength of the connection between the inner tube and the second tube body, and can avoid bending of the connection even in complex situations such as curved or narrow blood vessels, thereby ensuring the overall passability and operational stability of the balloon catheter, and significantly improving the safety and success rate of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] A more complete understanding of the invention and its attendant advantages and features will be more readily appreciated by referring to the following detailed description taken in conjunction with the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention.

[0020] Figure 2 yes Figure 1 Schematic diagram of the local structure.

[0021] Figure 3 It is a structural diagram of embodiment 2 of the present invention.

[0022] Figure 4 and Figure 5 yes Figure 3 Schematic diagram of the local structure.

[0023] Figure 6 It is a structural diagram of embodiment 3 of the present invention.

[0024] Figure 7 yes Figure 6 Schematic diagram of the local structure.

[0025] Figure 8 It is a structural diagram of embodiment 3 of the present invention.

[0026] In the accompanying drawings: 1 is a tube seat, 2 is an outer tube, 3 is an inner tube, 4 is a balloon, 5 is a first tube body, 6 is a second tube body, 7 is a guide wire channel, 8 is a filling channel, 9 is an extension section, and 10 is a traction wire.

[0027] It should be noted that the drawings are used to illustrate the present invention, rather than to limit the present invention. Note that the drawings showing the structures may not be drawn to scale. In addition, in the drawings, the same or similar elements are marked with the same or similar reference numerals. DETAILED DESCRIPTION

[0028] In order to make the contents of the present invention clearer and easier to understand, the contents of the present invention are described in detail below in conjunction with specific embodiments and drawings.

[0029] The "proximal end" and "distal end" referred to in the present invention should be understood as observed from the direction of the attending physician. The "proximal end" refers to the end close to the attending physician, which corresponds to the "left end" indicated in the reference drawing, and the "distal end" refers to the end away from the attending physician, which corresponds to the "right end" indicated in the reference drawing.

[0030] Embodiment 1: The balloon catheter of this embodiment is designed to improve its passability and operational stability under complex vascular conditions, while ensuring the safety and success rate of the surgical process. Figure 1 and Figure 2 As shown, the balloon catheter of this embodiment includes a tube seat 1, an outer tube 2, an inner tube 3 and a balloon 4.

[0031] The outer tube 2 includes a first tube body 5 and a second tube body 6 connected in sequence from the proximal end to the distal end. The proximal end of the first tube body 5 is formed as a fixed end and is fixedly connected to the tube seat 1. The distal end of the first tube body 5 is formed as a free end and extends into the second tube body 6, but does not contact the inner wall of the second tube body 6 to maintain a certain movable space. The second tube body 6 is coaxially arranged with the first tube body 5. The proximal end of the second tube body 6 is fixed to the outside of the first tube body 5 and the distal end of the first tube body 5 is covered therein. The proximal end of the second tube body 6 is formed into a cone with a small proximal end and a large distal end. The conical small end of the proximal end of the second tube body 6 is fixed to the outer surface of the first tube body 5 by welding. Of course, it can also be welded or bonded. The connection between the two is close to the distal end of the first tube body 5. The distal end of the second tube body 6 is fixedly connected to the proximal end of the balloon 4.

[0032] A guidewire channel 7 is formed inside the inner tube 3 for the guidewire to pass through, and a filling channel 8 for balloon filling is formed between the outer portion of the inner tube 3 and the inner portion of the outer tube 2. The proximal end of the filling channel 8 is communicated with the tube seat 1, and the entrance of the filling channel 8 is formed by the tube seat 1, and the distal end of the filling channel 8 is communicated with the balloon 4. The proximal end of the inner tube 3 is offset to one side of the inner wall of the second tube body 6 and connected to the inner wall of the second tube body 6, and penetrates the inner wall of the second tube body 6 to form the entrance of the guidewire channel 7. The distal end of the inner tube 3 extends out of the distal end of the second tube body 6 and is fixedly connected to the distal end of the balloon 4, so that the balloon 4 is arranged between the distal end of the outer tube 2 and the distal end of the inner tube 3.

[0033] After the distal end of the first tube body 5 extends into the second tube body 6, although it does not directly contact the inner wall of the second tube body 6, it cleverly contacts the inner tube 3 connected to the inner wall of the second tube body 6. In this way, not only the mechanical strength of the connection between the inner tube 3 and the second tube body 6 is enhanced, but also it is ensured that even in the face of complex situations such as blood vessel bending or stenosis, the connection is not easy to bend, thereby ensuring the overall passability and operational stability of the balloon catheter.

[0034] In order to further optimize this contact point, the end face of the distal end of the first tube body 5 is designed to be a beveled surface, which is inclined from the proximal end to the distal end, and its tip extends toward the distal end to form an extension section 9 in contact with the inner tube 3. The distal end of the extension section 9 is a free end and is located in the second tube body 6. In order to improve the contact effect, the extension section 9 is designed to be arc-shaped to better fit the surface of the inner tube 3. Such a design not only enhances the mechanical strength of the connection between the inner tube 3 and the second tube body 6, but also ensures that the connection is not prone to bending under complex vascular conditions, thereby further improving the overall passability and operational stability of the balloon catheter, and significantly improving the safety and success rate of the operation.

[0035] Embodiment 2: Different from Embodiment 1, Figures 3 to 5 As shown, the structure of the extension section 9 of this embodiment is different. Specifically, the distal end of the extension section 9 serves as a fixed end, and after extending out of the distal end of the second tube body 6, it is fixedly connected to the distal end of the inner tube 3. In this way, the extension section 9 is not only fixedly connected to the distal end of the inner tube 3, but also basically consistent with the length direction of the entire inner tube 3, and even involves the entire balloon 4. This design further enhances the mechanical strength of the connection between the inner tube 3 and the second tube body 6, while ensuring the overall rigidity of the distal end of the balloon catheter, avoiding the problem of the distal end being too flexible, thereby significantly improving the passability and operational stability of the balloon catheter.

[0036] This design of the extension section 9 has the following advantages: first, the extension section 9 is fixedly connected to the distal end of the inner tube 3, which increases the mechanical strength of the connection and reduces the risk of bending in a complex vascular environment; second, due to the existence of the extension section 9, the overall rigidity of the distal end of the balloon catheter is enhanced, making the catheter more stable when passing through a curved or narrow part of the blood vessel; finally, the length direction of the extension section 9 is basically consistent with that of the inner tube 3, ensuring that the contact between the two is more uniform and stable, further improving the overall performance of the catheter. These advantages work together to enable the balloon catheter to show better passability and operational stability under complex vascular conditions, significantly improving the safety and success rate of the operation.

[0037] It can be seen that this embodiment, by optimizing the design of the extension section 9, not only enhances the mechanical strength of the connection between the inner tube 3 and the second tube body 6, but also improves the rigidity of the distal end of the balloon catheter, thereby exhibiting better passability and operational stability under complex vascular conditions, and significantly improving the safety and success rate of the operation.

[0038] The other structures of this embodiment are consistent with those of the first embodiment and will not be described again here.

[0039] Embodiment 3: Different from Embodiment 2, the Figure 6 and Figure 7As shown, the present embodiment adds a traction wire 10. The proximal end of the traction wire 10 extends out of the proximal end of the tube seat 1 for easy operation, and the distal end of the traction wire 10 passes through the first tube body 5 and the second tube body 6 and is fixedly connected to the distal end of the inner tube 3. The function of the traction wire 10 is to adjust the bending angle of the part of the distal end of the inner tube 3 extending out of the balloon 4, which is called the AB segment, wherein point B is a fixed point, the distal end of the traction wire 10 is fixed at point B, and point A is a clamping point, and the starting end of the distal end of the traction wire 10 is movably clamped at point A. By pulling the proximal end of the traction wire 10, the distal end of the traction wire 10 and the corresponding AB segment of the inner tube 3 can be acted on, so that the bending angle of the AB segment is adjustable, thereby facilitating the smooth passage of the balloon 4 through complex blood vessels.

[0040] In addition, after passing through the first tube body 5 and the second tube body 6, the distal end of the traction wire 10 extends along the inner wall of the extension section 9 to the distal end of the inner tube 3 and is fixedly connected to the distal end of the inner tube 3. In this way, the extension section 9 limits the traction wire 10, preventing the traction wire 10 from shifting during the pulling process, ensuring that the bending adjustment area is always the AB section, thereby further improving the passability and operational stability of the balloon catheter in a complex vascular environment.

[0041] The other structures of this embodiment are consistent with those of the second embodiment and will not be described again here.

[0042] Embodiment 4: Different from Embodiment 3, the Figure 8 As shown, the extension section 9 of this embodiment is spirally coiled on the outer wall of the inner tube 3, and the traction wire 10 is tightly attached to the outer wall of the inner tube 3. This arrangement not only further enhances the limiting effect on the traction wire 10, but also ensures that the traction wire 10 will not be displaced during the pulling process, thereby ensuring that the bending adjustment area is always the AB segment. Specifically, the spiral extension section 9 can provide a more stable limit, so that the position of the traction wire 10 on the outer wall of the inner tube 3 is more fixed, reducing the problem of inaccurate bending caused by the displacement of the traction wire 10, and further improving the passability and operational stability of the balloon catheter in a complex vascular environment.

[0043] The other structures of this embodiment are consistent with those of the third embodiment and will not be described again here.

[0044] It is to be understood that, although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any person skilled in the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A balloon catheter, comprising a tube seat (1), an outer tube (2), an inner tube (3) and a balloon (4), wherein the outer tube (2) is connected to the tube seat (1), the proximal end of the inner tube (3) is offset toward one side of the inner wall of the outer tube (2) and connected to the inner wall of the outer tube (2) and penetrates the inner wall of the outer tube (2), the distal end of the inner tube (3) extends out of the distal end of the outer tube (2), the balloon (4) is arranged between the distal end of the outer tube (2) and the distal end of the inner tube (3), a guide wire channel (7) for a guide wire to pass through is formed inside the inner tube (3), and a filling channel (8) for filling the balloon is formed between the outside of the inner tube (3) and the inside of the outer tube (2), wherein the balloon catheter is characterized in that: The outer tube (2) comprises a first tube body (5) and a second tube body (6) which are connected in sequence from the proximal end to the distal end. The proximal end of the second tube body (6) is fixed to the outside of the first tube body (5) and the distal end of the first tube body (5) is covered therein. The proximal end of the first tube body (5) is formed as a fixed end and is fixedly connected to the tube seat (1). The distal end of the first tube body (5) is formed as a free end and contacts the inner tube (3) connected to the inner wall of the second tube body (6) after extending into the second tube body (6). The connection between the second tube body (6) and the first tube body (5) is close to the distal end of the first tube body (5). The distal end of the first tube body (5) does not contact the inner wall of the second tube body (6) after extending into the second tube body (6). The end surface of the distal end of the first tube body (5) is formed as a chamfered surface, and the tip of the chamfered surface extends toward the distal end to form an extension section (9) contacting the inner tube (3).

2. The balloon catheter according to claim 1, characterized in that: The proximal end of the second tube body (6) is formed into a cone with a small proximal end and a large distal end. The small conical end of the proximal end of the second tube body (6) is fixed to the outer surface of the first tube body (5) by means of fusion, welding or bonding.

3. The balloon catheter according to claim 1, characterized in that: The extension section (9) is formed in an arc shape.

4. The balloon catheter according to claim 1, characterized in that: The distal end of the extension section (9) is a free end and is located inside the second tube body (6).

5. The balloon catheter according to claim 1, characterized in that: The distal end of the extension section (9) is a fixed end and is fixedly connected to the distal end of the inner tube (3) after extending out of the distal end of the second tube body (6).

6. The balloon catheter according to claim 5, characterized in that: A traction wire (10) is provided in the first tube body (5), and the distal end of the traction wire (10) extends along the inner wall of the extension section (9) to the distal end of the inner tube (3) and is fixedly connected to the distal end of the inner tube (3).

7. The balloon catheter according to claim 6, characterized in that: The proximal end of the traction wire (10) extends out of the proximal end of the tube seat (1).

8. The balloon catheter according to claim 6, characterized in that: The extension section (9) is spirally coiled around the outer wall of the inner tube (3), and the traction wire (10) is tightly attached to the outer wall of the inner tube (3).

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