Balloon dilatation catheter

Abstract

The utility model discloses a balloon dilatation catheter which comprises a catheter body, the catheter body comprises a near-end catheter section, a variable-diameter catheter section and a far-end catheter section which are sequentially arranged from the near end to the far end, the outer diameter of the near-end catheter section is larger than that of the far-end catheter section, and the variable-diameter catheter section is connected between the near-end catheter section and the far-end catheter section; the outer diameter of the variable-diameter catheter section is gradually reduced in the direction from the near-end catheter section to the far-end catheter section. The balloon is connected to the far-end catheter section and can expand in the radial direction relative to the far-end catheter section. By means of the design, the variable-diameter catheter section between the near-end catheter section and the far-end catheter section is in a smooth gradual change process, no step exists, and the problems that in the prior art, a catheter is prone to being broken at the step-shaped position, and the step-shaped catheter is prone to causing damage to blood vessels are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of interventional treatment devices, and particularly relates to a balloon dilation catheter. Background Art

[0002] Minimally invasive interventional treatment is a technique for reconstructing arterial blood flow by puncturing blood vessels such as the femoral artery and radial artery, and using interventional medical devices such as balloon dilation catheters for the dilation treatment of stenotic blood vessels, so that the diseased part remains in a dilated state, achieving the effect of relieving arterial stenosis or obstruction. Due to the advantages of less postoperative trauma, short recovery time, and good treatment effect, this treatment method has been widely used in clinical practice.

[0003] A balloon dilation catheter generally includes a catheter hub, a catheter, and a balloon located at the distal end of the catheter; among them, the catheter is used to push the balloon to the diseased position. Since blood vessels are relatively thin, especially intracranial blood vessels, the distal diameter of the catheter should be small to adapt to the diameter of the blood vessels; there is a need for a diameter change from the proximal end to the distal end of the catheter. In the prior art, the diameter-changing part of the catheter is usually stepped, and the catheter is prone to break at the step. Summary of the Utility Model

[0004] In view of this, the utility model provides a balloon dilation catheter to solve the problem that the existing balloon dilation catheter is prone to break at the stepped diameter change.

[0005] To solve the above technical problems, the technical solution of the utility model is as follows:

[0006] A balloon dilation catheter, comprising:

[0007] A catheter, including a proximal catheter segment, a diameter-changing catheter segment, and a distal catheter segment arranged in sequence from the proximal end to the distal end, the outer diameter of the proximal catheter segment is greater than the outer diameter of the distal catheter segment, and the diameter-changing catheter segment is connected between the proximal catheter segment and the distal catheter segment; in the direction from the proximal catheter segment to the distal catheter segment, the outer diameter of the diameter-changing catheter segment gradually decreases;

[0008] A balloon, connected to the distal catheter segment and capable of radially expanding relative to the distal catheter segment.

[0009] Further, the hardness of the proximal catheter segment is greater than the hardness of the distal catheter segment.

[0010] Further, it further includes a catheter hub, and the catheter hub is connected to the proximal catheter segment.

[0011] Further, a reinforcing member is sleeved on the outer periphery of the proximal catheter segment near one end connected to the catheter hub.

[0012] Further, the catheter includes an inner tube and an outer tube. The inner tube passes through the inside of the outer tube. The distal end of the balloon is connected to the inner tube, and the proximal end of the balloon is connected to the outer tube. The proximal end of the outer tube is connected to the catheter hub. A filling channel that communicates with the inner cavity of the balloon is formed between the inner tube and the outer tube. The catheter hub is provided with a balloon filling connector that communicates with the filling channel.

[0013] Further, the inner cavity of the inner tube is a guide wire lumen for the passage of a guide wire. The catheter hub is provided with a guide wire exit, and the proximal end of the inner tube is connected to the guide wire exit.

[0014] Further, the catheter further includes a distal end tube connected to the distal end of the inner tube.

[0015] Further, a radiopaque ring is sleeved on the portion of the inner tube located inside the balloon.

[0016] Further, the radiopaque ring is composed of two thin-walled rings made of platinum-iridium alloy.

[0017] Further, the material of the balloon is any one or more of polyvinyl chloride, polyethylene, polyurethane, polyamide, polyether block polyamide, and polyethylene terephthalate.

[0018] The technical solution of the present utility model has the following advantages: The diameter-changing catheter section between the proximal catheter section and the distal catheter section is a smooth gradual change process without steps, overcoming the problems in the prior art that the catheter is prone to break at the stepped part and the stepped catheter is likely to cause damage to blood vessels. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is a schematic structural diagram of the balloon dilation catheter provided by the embodiment of the present utility model;

[0021] Figure 2 is Figure 1 an enlarged view of part A in

[0022] Figure 3 is a schematic structural diagram of the mold used for forming the diameter-changing catheter section on the catheter in the embodiment of the present utility model.

[0023] Description of reference numerals: 1. catheter; 1a. proximal catheter segment; 1b. tapered catheter segment; 1c. distal catheter segment; 11. inner tube; 12. outer tube; 13. terminal tube; 14. filling channel; 15. guide wire lumen; 2. balloon; 3. catheter hub; 31. balloon inflation adapter; 32. guide wire exit; 4. reinforcement; 5. radiopaque ring; 6. mold; 61. tapered cavity. Detailed implementation manners

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without any creative work shall fall within the protection scope of the present utility model.

[0025] In the description of this application, it should be understood that the terms "proximal" and "distal" throughout the text refer to near and far relative to the operator. When the present utility model is in use, the end close to the doctor or the operator is the "proximal end", that is, the end where the operator is located, and the end far from the doctor or the operator is the "distal end", that is, the end where the balloon is located. The above-mentioned orientation descriptions are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0026] As Figure 1 As shown in Fig. -2, a balloon dilation catheter includes a catheter 1, a balloon 2, and a catheter hub 3. Among them, the catheter 1 includes a proximal catheter segment 1a, a tapered catheter segment 1c, and a distal catheter segment 1b arranged in sequence from proximal to distal. The outer diameter of the proximal catheter segment 1a is greater than the outer diameter of the distal catheter segment 1b, and the tapered catheter segment 1c is connected between the proximal catheter segment 1a and the distal catheter segment 1b. In the direction from the proximal catheter segment 1a to the distal catheter segment 1b, the outer diameter of the tapered catheter segment 1c gradually decreases, and the change in the outer diameter of the tapered catheter segment 1c is a smooth gradual process without steps. The balloon 2 is connected to the distal catheter segment 1b, and the balloon 2 can radially expand relative to the distal catheter segment 1b. The catheter hub 3 is connected to the proximal end of the proximal catheter segment 1a.

[0027] In some embodiments, the hardness of the proximal catheter segment 1a is greater than the hardness of the distal catheter segment 1b; the relatively large hardness of the proximal catheter segment 1a facilitates the proximal catheter segment 1a to push the balloon 2; the relatively small hardness of the distal catheter segment 1b facilitates the distal catheter segment 1b to enter the lesion site through tortuous blood vessels. The proximal catheter segment 1a can increase the hardness by wrapping an external material layer or other means, or by increasing the wall thickness of the tube body of the catheter 1 in the proximal catheter segment 1a part.

[0028] As shown Figure 1 in Figure 1, the catheter 1 includes an inner tube 11, an outer tube 12, and a terminal tube 13. The inner tube 11 passes through the inside of the outer tube 12, and the terminal tube 13 is connected to the distal end of the inner tube 11. The distal end of the balloon 2 is connected to the inner tube 11, and the proximal end of the balloon 2 is connected to the outer tube 12. The inner tube 11 passes through the balloon 2. The proximal end of the outer tube 12 is connected to the catheter hub 3. A filling channel that communicates with the inner cavity of the balloon 2 is formed between the inner tube 11 and the outer tube 12. The catheter hub 3 is a Y-shaped hollow structure. A balloon filling connector 31 and a guide wire outlet 32 are provided on the catheter hub 3. The balloon filling connector 31 communicates with the filling channel. The inner cavity of the inner tube 11 is a guide wire lumen for the passage of a guide wire, and the proximal end of the inner tube 11 is connected to the guide wire outlet 32. Among them, the connection manner of the terminal tube 13, the balloon 2, and the inner tube 11 is thermal welding or laser welding.

[0029] Among them, the part where the diameter of the catheter 1 changes is in the outer tube 12, while the diameter of the inner tube 11 remains unchanged. The diameter of the outer tube 12 in the proximal catheter segment 1a is greater than the diameter of the outer tube 12 in the proximal catheter segment 1a. The tapered catheter segment 1c of the outer tube 12 is integrally connected between the proximal catheter segment 1a of the outer tube 12 and the distal catheter segment 1b of the outer tube 12. In the direction from the proximal catheter segment 1a to the distal catheter segment 1b, the diameter of the outer tube 12 in the tapered catheter segment 1c gradually decreases, and the change in the diameter of the outer tube 12 in the tapered catheter segment 1c is a smooth gradual change process.

[0030] As shown Figure 1 in Figure 2, the material of the balloon 2 is any one or more of polyvinyl chloride, polyethylene, polyurethane, polyamide, polyether block polyamide, and polyethylene terephthalate. It can be understood here that the material of the balloon 2 can also be other biocompatible polymer materials.

[0031] As shown Figure 1 in Figure 3, a radiopaque ring 5 is sleeved on the part of the inner tube 11 located inside the balloon 2. The radiopaque ring 5 is visible under X-rays and can mark the position of the balloon 2 during the operation, facilitating the operator to smoothly deliver the balloon 2 to the diseased blood vessel area. Specifically, there are two radiopaque rings 5, and the radiopaque ring 5 is specifically a thin-walled ring made of platinum-iridium alloy.

[0032] In some embodiments, a reinforcement 4 is sleeved on the outer periphery of the outer tube 12 near one end of the catheter hub 3. The setting of the reinforcement 4 can increase the hardness of the outer tube 12 near one end of the catheter hub 3, facilitating the pushing of the distal balloon 2. Specifically, the reinforcement 4 can be a tubular member sleeved on the outer periphery of the outer tube 12, or a silk thread or bandage wound around the outer periphery of the outer tube 12, or a material layer adhesively fixed or welded to the outer periphery of the outer tube 12; it can be understood here that any component that can strengthen the hardness of the outer tube 12 can be used as the reinforcement 4.

[0033] In some embodiments, using Figure 3 the shown mold 6 to process the catheter 1 can form a reduced-diameter catheter section 1c on the catheter 1. The mold 6 is made of beryllium copper material. A tapered cavity 61 is provided in the mold 6. The outer diameters of the two open ends of the tapered cavity 61 are different. When processing the catheter 1, the pipe is inserted into the tapered cavity 61, and the pipe is stretched from both ends, then a catheter 1 with a gently gradually changing diameter can be obtained.

[0034] The usage process of this balloon dilation catheter is as follows: During the preoperative angiography to evaluate the diseased blood vessel condition, select a balloon dilation catheter and a catheter sheath of appropriate size, select an appropriate site to puncture the blood vessel, insert the guide wire into the diseased site of the blood vessel through the catheter sheath, insert the proximal end of the guide wire into the tip hole of the balloon dilation catheter, and push the balloon dilation catheter forward until the diseased site of the blood vessel stenosis. If necessary, the guide wire can be withdrawn, and contrast agent can be injected from the guide wire outlet to observe the diseased site. After the angiography is completed, the guide wire is reinserted, the pump is connected to the balloon inflation joint 31 on the catheter hub 3, the pump is started until above the nominal pressure of the balloon 2, after the balloon 2 is fully dilated, the balloon 2 is evacuated to make it fully retract after the operation, and then the balloon dilation catheter is withdrawn.

[0035] In summary, for the balloon dilation catheter provided by the embodiment of the present invention, since the reduced-diameter catheter section 1c between the proximal catheter section 1a and the distal catheter section 1b is a smooth gradual change process without steps, it overcomes the problems in the prior art that the catheter is prone to break at the stepped part and the stepped catheter 1 is prone to damage the blood vessel.

[0036] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A balloon dilation catheter, characterized in that, Comprising: A catheter (1), including a proximal catheter segment (1a), a diameter-changing catheter segment (1c), and a distal catheter segment (1b) arranged in sequence from proximal to distal. The outer diameter of the proximal catheter segment (1a) is greater than that of the distal catheter segment (1b), and the diameter-changing catheter segment (1c) is connected between the proximal catheter segment (1a) and the distal catheter segment (1b); in the direction from the proximal catheter segment (1a) to the distal catheter segment (1b), the outer diameter of the diameter-changing catheter segment (1c) gradually decreases; A balloon (2), connected to the distal catheter segment (1b) and capable of radially expanding relative to the distal catheter segment (1b).

2. The balloon dilation catheter according to claim 1, wherein The hardness of the proximal catheter segment (1a) is greater than that of the distal catheter segment (1b).

3. The balloon dilation catheter according to claim 1, wherein, It further includes a catheter hub (3), and the catheter hub (3) is connected to the proximal catheter segment (1a).

4. The balloon dilation catheter according to claim 3, wherein A reinforcing member (4) is sleeved on the outer periphery of one end of the proximal catheter segment (1a) close to the catheter hub (3).

5. The balloon dilation catheter according to claim 3, characterized in that, The catheter (1) includes an inner tube (11) and an outer tube (12). The inner tube (11) passes through the inside of the outer tube (12). The distal end of the balloon (2) is connected to the inner tube (11), the proximal end of the balloon (2) is connected to the outer tube (12), the proximal end of the outer tube (12) is connected to the catheter hub (3), and a filling channel communicating with the inner cavity of the balloon (2) is formed between the inner tube (11) and the outer tube (12). A balloon filling joint (31) communicating with the filling channel is provided on the catheter hub (3).

6. The balloon dilation catheter according to claim 5, wherein, The inner cavity of the inner tube (11) is a guide wire lumen for a guide wire to pass through. A guide wire exit (32) is provided on the catheter hub (3), and the proximal end of the inner tube (11) is connected to the guide wire exit (32).

7. The balloon dilation catheter according to claim 5, characterized in that, The catheter (1) further includes a tip tube (13) connected to the distal end of the inner tube (11).

8. The balloon dilation catheter according to claim 5, wherein, A radiopaque ring (5) is sleeved on the part of the inner tube (11) located inside the balloon (2).

9. The balloon dilation catheter according to claim 8, wherein, There are two radiopaque rings (5), and the radiopaque rings (5) are thin-walled annular bodies made of platinum-iridium alloy.

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