Microcatheter with anti-reflux device

Abstract

The utility model relates to a micro catheter with an anti-reflux device, which belongs to the technical field of medical instruments and comprises a catheter body, the anti-reflux device is arranged on the catheter body, and the tail end of the catheter body is connected with a catheter seat. The anti-reflux device protrudes out of the outer wall of the catheter body, the maximum outer diameter of the anti-reflux device is close to the inner diameter of a blood vessel, and a gap between the micro catheter and the inner wall of the blood vessel can be reduced; according to the micro catheter with the anti-reflux device, the anti-reflux device is arranged on the catheter body, and a gap between a blood vessel and the micro catheter is reduced through the anti-reflux device, so that liquid or embolic agents are prevented from flowing back in the injection process; the micro-catheter is simple in structure, small in influence on the pushing performance of the micro-catheter and capable of effectively reducing the risk of liquid or embolism agent countercurrent, and compared with a clinically-used blocking balloon micro-catheter, the operation of balloon exhausting, filling and the like is reduced, and the clinical operation process is simplified.

Description

Technical Field

[0001] The utility model relates to a micro-catheter with an anti-backflow device, belonging to the technical field of medical equipment. Background Art

[0002] A microcatheter is a reinforced catheter with a very small diameter, mainly used in minimally invasive interventional procedures. The diameter of a microcatheter is usually between 0.70-1.30 mm. The design of this catheter enables it to move flexibly within the body's blood vessels and perform multiple tasks, such as supporting guidewires, exchanging guidewires, passing through diseased tissues, and delivering embolic agents and stents.

[0003] During the operation, after the microcatheter enters the intended blood vessel at the lesion site, during the process of injecting liquid or embolic agent into the lesion site, due to the gap between the inner wall of the blood vessel and the outer wall of the microcatheter, the liquid or embolic agent will flow back along the gap during injection, thus affecting non-target blood vessels or organs, which may lead to serious complications. Taking the current cutting-edge adrenal artery ablation as an example, because the ablation liquid is anhydrous ethanol, which has strong fluidity, the backflowing anhydrous ethanol will damage the blood vessels that are not the ablation target. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the technical problem to be solved by the utility model is to provide a microcatheter with an anti-backflow device, add the anti-backflow device to the microcatheter, reduce the gap between the blood vessel and the tip of the microcatheter, and thus avoid the backflow of liquid or embolic agent.

[0005] The microcatheter with an anti-backflow device described in the utility model comprises a catheter body, on which the anti-backflow device is arranged, and the tail end of the catheter body is connected to a catheter seat; the anti-backflow device protrudes from the outer wall of the catheter body, and the maximum outer diameter of the anti-backflow device is close to the inner diameter of the blood vessel, so as to reduce the gap between the microcatheter and the inner wall of the blood vessel.

[0006] The technical solution of the utility model is to provide a microcatheter with an anti-backflow device. The anti-backflow device is arranged on the catheter body, and the anti-backflow device can reduce the gap between the microcatheter and the inner wall of the blood vessel, thereby avoiding the backflow of liquid or embolic agent during injection.

[0007] Preferably, the number of the anti-backflow device is at least one, and the anti-backflow device is fixed to the catheter body by welding, adhesive connection or threaded connection.

[0008] Preferably, the catheter tube body is composed of at least an inner resin layer and an outer resin layer, a braided layer is sandwiched between the inner resin layer and the outer resin layer, and the braided layer can improve the pressure resistance and pushing performance of the catheter tube body; the outer wall of the catheter tube body can be provided with a hydrophilic coating to reduce the friction of the catheter tube body when it moves in the blood vessel, thereby reducing damage to the blood vessel.

[0009] Furthermore, a developing ring is provided near the head end of the catheter tube body to facilitate viewing of the head end of the catheter tube body under CT equipment.

[0010] Preferably, the catheter seat is adhesively connected to the catheter body, and a stress diffusion tube is sleeved on the catheter body. The stress diffusion tube is located at the connection between the catheter body and the catheter seat to prevent the connection from being bent and damaged due to stress during surgery.

[0011] Preferably, the anti-backflow device has an outer shape of a drum, a cone, a spindle, or a cylinder.

[0012] Preferably, the material of the backflow prevention device is one of resin, silicone, ceramic, stainless steel, and precious metal; the precious metal is one of gold, silver, tantalum, and platinum-iridium alloy.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The microcatheter with an anti-backflow device described in the utility model is provided with an anti-backflow device on the catheter body, and the gap between the blood vessel and the microcatheter is reduced by the anti-backflow device, thereby avoiding the backflow of liquid or embolic agent during injection; the utility model has a simple structure, has little effect on the pushing performance of the microcatheter, can effectively reduce the risk of backflow of liquid or embolic agent, and compared with the clinically used blocking balloon microcatheter, reduces the operations of balloon venting and filling, and simplifies the clinical operation process; the utility model can reduce the gap between the blood vessel and the head end of the microcatheter by 30%-100%, and reduce the liquid backflow rate by 50%-100%. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of Example 1;

[0016] Figure 2 is a schematic structural diagram of Example 2;

[0017] Figure 3 is a schematic structural diagram of Example 3;

[0018] Figure 4 is a schematic structural diagram of Example 4;

[0019] Figure 5 is a schematic structural diagram of Example 5;

[0020] Figure 6 It is a structural schematic diagram of Example 6.

[0021] In the figure: 1. Anti-backflow device; 2. Catheter body; 3. Stress diffusion tube; 4. Catheter seat; 5. Development ring. DETAILED DESCRIPTION

[0022] Example 1

[0023] like Figure 1 As shown, this embodiment is implemented through the following technical solutions: it includes a catheter body 2, on which an anti-backflow device 1 is provided, and the tail end of the catheter body 2 is connected to the catheter seat 4; the anti-backflow device 1 protrudes from the outer wall of the catheter body 2, and the maximum outer diameter of the anti-backflow device 1 is close to the inner diameter of the blood vessel, which can reduce the gap between the microcatheter and the inner wall of the blood vessel; the anti-backflow device 1 is an anti-backflow ring sleeved on the outside of the catheter body 2, and the material of the anti-backflow ring is the same as the material of the outer wall of the catheter body 2.

[0024] In this embodiment, the number of the anti-backflow device 1 is two, and a step is provided at the joint between the anti-backflow device 1 and the catheter body 2; the anti-backflow device 1 is fixed to the catheter body 2 by welding. The catheter body 2 is composed of an internal resin layer and an external resin layer, and a braided layer is sandwiched between the internal resin layer and the external resin layer, and the braided layer can improve the pressure resistance and pushing performance of the catheter body; the outer wall of the catheter body 2 is provided with a hydrophilic coating to reduce the friction of the catheter body 2 when it moves in the blood vessel and reduce damage to the blood vessel. The catheter body 2 is provided with a developing ring 5 near the head end to facilitate the viewing of the head end of the catheter body 2 under the CT device. The catheter seat 4 is bonded to the catheter body 2 by instant glue or light-curing glue, and a stress diffusion tube 3 is sleeved on the catheter body 2. The stress diffusion tube 3 is located at the connection between the catheter body 2 and the catheter seat 4 to prevent the connection from being damaged by bending due to force during surgery. The anti-backflow device 1 has a drum shape.

[0025] Example 2

[0026] like Figure 2 As shown, the number of the anti-backflow device 1 is one, and the anti-backflow device 1 has a conical shape. The other structures of the embodiment 2 are the same as those of the embodiment 1.

[0027] Example 3

[0028] like Figure 3 As shown, the number of the anti-backflow device 1 is one, and the anti-backflow device 1 is spindle-shaped. The other structures of the embodiment 3 are the same as those of the embodiment 1.

[0029] Example 4

[0030] like Figure 4 As shown, the number of the anti-backflow device 1 is one, and the anti-backflow device 1 is cylindrical in shape. The other structures of the embodiment 4 are the same as those of the embodiment 1.

[0031] Example 5

[0032] like Figure 5As shown, the number of the backflow prevention device 1 is one, and the other structures of Example 5 are the same as those of Example 1.

[0033] Example 6

[0034] like Figure 6 As shown, the number of the anti-backflow device 1 is one, and the joint between the anti-backflow device 1 and the catheter body 2 is a smooth transition. The other structures of Example 6 are the same as those of Example 1.

Claims

1. A microcatheter with an anti-backflow device, characterized in that: The catheter body (2) comprises a catheter tube body (2) on which an anti-backflow device (1) is provided, and the rear end of the catheter tube body (2) is connected to a catheter seat (4); the anti-backflow device (1) protrudes from the outer wall of the catheter tube body (2), and the maximum outer diameter of the anti-backflow device (1) is close to the inner diameter of the blood vessel; The number of the backflow prevention device (1) is at least one, and the backflow prevention device (1) is fixed to the catheter body (2) by welding, adhesive connection or threaded connection.

2. The microcatheter with an anti-backflow device according to claim 1, characterized in that: The anti-backflow device (1) has an outer shape of one of a drum shape, a cone shape, a spindle shape, and a cylinder shape.

3. The microcatheter with an anti-backflow device according to claim 1, characterized in that: The catheter tube body (2) is composed of at least an inner resin layer and an outer resin layer, a braided layer is sandwiched between the inner resin layer and the outer resin layer, and the outer wall of the catheter tube body (2) may be provided with a hydrophilic coating.

4. The microcatheter with an anti-backflow device according to claim 3, characterized in that: The catheter body (2) is provided with a developing ring (5) near the head end.

5. The microcatheter with an anti-backflow device according to claim 1, characterized in that: The catheter seat (4) is bonded to the catheter body (2), a stress diffusion tube (3) is sleeved on the catheter body (2), and the stress diffusion tube (3) is located at the connection between the catheter body (2) and the catheter seat (4).

6. The microcatheter with an anti-backflow device according to claim 1, characterized in that: The material of the backflow prevention device (1) is one of resin, silica gel, ceramic, stainless steel and precious metal.

7. The microcatheter with an anti-backflow device according to claim 6, characterized in that: The precious metal is one of gold, silver, tantalum and platinum-iridium alloy.

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