Drug balloon catheter

Abstract

The utility model discloses a medicine balloon catheter which comprises an inner layer balloon which is sleeved and fixed outside a guide wire, and an outer layer balloon which is sleeved and fixed outside the guide wire. The outer-layer balloon is fixedly arranged outside the inner-layer balloon in a sleeving manner, a plurality of release holes are formed in the outer part of the outer-layer balloon, and the release holes are used for releasing medicines; the filling channel is communicated with the inner-layer balloon and is used for introducing a filling medium into the inner-layer balloon, so that the inner-layer balloon is expanded; the medicine delivery channel is communicated with a gap between the inner-layer balloon and the outer-layer balloon, and the medicine delivery channel is used for delivering medicine into the gap. Through the design of the double-layer sacculus, the medicine is arranged in the medicine storage space between the double-layer sacculus, after the sacculus is conveyed to a target position, the medicine is released through the release hole, the problem that the medicine is lost in the sacculus conveying process can be reduced, and the treatment effect can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a drug balloon catheter. Background Art

[0002] The drug eluting balloon structure of the prior art generally sprays the drug on the balloon surface. After the balloon reaches the lesion site, the balloon is filled so that the outer surface of the balloon contacts the inner wall of the blood vessel, thereby releasing the drug and inhibiting the proliferation of the inner wall of the blood vessel.

[0003] However, due to the longer intracranial access and more tortuous nerve and blood vessels, the situation faced by intracranial drug eluting balloon catheters in clinical applications is relatively complicated, that is, the surface drug will fall off during actual use, affecting the treatment effect. The existing perforated balloon (i.e., a through hole is opened on the outer wall of the balloon so that the drug is released from the balloon to the outside) can avoid the problem of drug loss, but due to the presence of the through hole, the pressure in the balloon leaks, making the balloon unable to fully dilate the blood vessels, thereby affecting the treatment effect. Utility Model Content

[0004] The purpose of the utility model is to solve the above problems and provide a drug balloon catheter.

[0005] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0006] A drug balloon catheter, comprising:

[0007] An inner balloon is sheathed and fixed on the outside of the guide wire;

[0008] An outer balloon is sleeved and fixed on the outside of the inner balloon, and a plurality of release holes are opened on the outside of the outer balloon for releasing drugs;

[0009] a filling channel, connected to the inner balloon, for introducing a filling medium into the inner balloon to expand the inner balloon;

[0010] The drug delivery channel is connected to the gap between the inner layer balloon and the outer layer balloon, and is used to deliver drugs into the gap.

[0011] As a further description of the above technical solution, a plurality of release holes are arranged along the axial direction of the outer balloon.

[0012] As a further description of the above technical solution, the diameter of the release hole gradually increases from an end close to the drug delivery channel to an end far away from the drug delivery channel.

[0013] As a further description of the above technical solution, the inner balloon and the outer balloon form a petal-like structure, and each of the petal-like structures includes a filling channel, a drug delivery channel and a release hole.

[0014] As a further description of the above technical solution, the space between the inner balloon and the outer balloon is a drug storage space, the filling channel is a filling tube, and the drug delivery channel is a drug tube.

[0015] As a further description of the above technical solution, the filling tube and the drug tube are provided as at least one group.

[0016] As a further description of the above technical solution, the shape of the release hole is any one of circular, square or triangular.

[0017] As a further description of the above technical solution, the drug is in the form of a paste or liquid. The beneficial effects of the utility model are as follows:

[0018] 1. The utility model adopts a double-layer balloon design to set the drug in the drug storage space between the double-layer balloons. After the balloon is delivered to the target position, the drug is released through the release hole, which can reduce the problem of drug loss during balloon delivery and improve the treatment effect.

[0019] 2. The utility model adopts a double-layer balloon design, in which the inner balloon is a closed structure, so that the balloon can be fully filled, solving the problem of pressure leakage, insufficient expansion and insufficient adhesion to the inner wall of the blood vessel caused by the through-hole balloon.

[0020] 3. The utility model uses a multi-petal structure to deliver drugs to the diseased part in a targeted manner, saving drugs and improving the treatment effect.

[0021] In order to more clearly illustrate the structural features and functions of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the interior of a drug-eluting balloon catheter;

[0023] Figure 2 is an external schematic diagram of a drug balloon catheter;

[0024] Figure 3 is a schematic diagram of a drug-eluting balloon catheter composed of multiple valve-like structures;

[0025] Figure 4 It is a cross-sectional view of a drug balloon catheter composed of multiple valve-like structures.

[0026] Figure numerals: 1. guide wire; 2. inner balloon; 3. outer balloon; 4. release hole; 5. drug storage space; 6. filling tube; 7. drug tube; 8. petal-like structure. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0028] like Figure 1-Figure 2 As shown, in one embodiment, a drug balloon catheter includes a guidewire 1, which can drive the drug balloon to a target position, an inner balloon 2 is fixed to the outside of the guidewire 1, and a filling channel extends into the inner balloon 2. A filling medium such as saline can be delivered to or extracted from the inner balloon 2 through the filling channel to control the expansion and contraction of the inner balloon 2.

[0029] An outer balloon 3 is fixedly arranged outside the inner balloon 2 , and a drug delivery channel extends into the space between the inner balloon 2 and the outer balloon 3 to deliver the drug into the space, which may also be referred to as a drug storage space 5 .

[0030] Release holes 4 are distributed on the outer balloon 3. First, the filling medium is filled into the inner balloon 2 through the filling channel to expand the inner balloon 2 and make the inner balloon 2 close to the inner wall of the outer balloon 3. Then, after the paste or liquid drug enters the drug storage space 5, the drug flows from the proximal end to the distal end of the drug storage space 5, thereby achieving the purpose of secondary filling. When the drug flows to the release hole 4, it can be released from the release hole 4, thereby achieving treatment of the target position. At the same time, compared with the existing technology, the problem of drug shedding on the balloon surface during balloon delivery, which causes a decrease in treatment effect, can be reduced. At the same time, since the inner balloon 2 is a closed space, the balloon can be fully expanded, so that it can better fit the blood vessel wall.

[0031] refer to Figure 3-Figure 4 Another embodiment provided by the present application is different from the previous embodiment in that, in this embodiment, the balloon body is composed of a plurality of petal-like structures surrounding a guide wire 1, and each petal-like structure includes a filling channel, a drug delivery channel, an inner layer and an outer layer, a drug storage space 5 and a release hole 4. When in use, after the balloon is delivered to the target position, the petal-like structure close to the lesion side is filled, thereby realizing directional release of drugs, which can save drugs while reducing damage to healthy blood vessel walls.

[0032] For further information, see Figure 2There are multiple release holes 4 arranged along the axial direction of the outer balloon 3, and the aperture of the release holes 4 gradually increases from the end close to the drug delivery channel to the end far from the drug delivery channel. Through the above arrangement, when the drug is transported from the proximal end to the distal end of the drug storage space 5, the drug will not be completely released from the first hole, but will continue to flow to the distal end under pressure. Since the pressure is transmitted from the proximal end to the distal end, the distal pressure is small, and the release hole 4 has a larger opening. The gradual design can ensure the uniformity of drug discharge. As for the shape of the release hole 4, a circle is used in this embodiment, and in other embodiments, a square, a triangle or any other regular shape can also be used.

[0033] Furthermore, the filling channel is a filling tube 6, and the drug delivery channel is a drug tube 7. Since the balloon is arranged on the outside of the guide wire 1, and the guide wire 1 cannot have a liquid inlet hole like a catheter, the drug tube 7 is arranged to be directly extended into the inner balloon 2 to control the expansion and contraction of the inner balloon 2. In the embodiment of the present application, both the filling tube 6 and the drug tube 7 are arranged in one, and in other feasible embodiments, both can be arranged in multiple groups as needed.

[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A drug balloon catheter, characterized in that: include: The inner balloon is sheathed and fixed on the outside of the guide wire; An outer balloon is sleeved and fixed on the outside of the inner balloon, and a plurality of release holes are opened on the outside of the outer balloon for releasing drugs; a filling channel, connected to the inner balloon, for introducing a filling medium into the inner balloon to expand the inner balloon; The drug delivery channel is connected to the gap between the inner layer balloon and the outer layer balloon, and is used to deliver drugs into the gap.

2. The drug balloon catheter according to claim 1, characterized in that: A plurality of release holes are arranged along the axial direction of the outer balloon.

3. The drug balloon catheter according to claim 1, characterized in that: The diameter of the release hole gradually increases from one end close to the medicine delivery channel to one end far away from the medicine delivery channel.

4. The drug balloon catheter according to claim 1, characterized in that: The inner balloon and the outer balloon form a petal-like structure, and each of the petal-like structures includes a filling channel, a drug delivery channel and a release hole.

5. The drug balloon catheter according to claim 1, characterized in that: The space between the inner balloon and the outer balloon is a drug storage space, the filling channel is a filling tube, and the drug delivery channel is a drug tube.

6. The drug balloon catheter according to claim 5, characterized in that: The filling tube and the medicine tube are provided as at least one group.

7. The drug balloon catheter according to claim 1, characterized in that: The shape of the release hole is any one of circular, square or triangular.

8. The drug balloon catheter according to claim 1, characterized in that: The medicine is in the form of paste or liquid.

Images