Balloon dilatation catheter with double-cannula structure

Abstract

The utility model discloses a balloon dilatation catheter with a double-cannula structure, relates to the technical field of medical instruments, and solves the technical problem that far-end myocardium or tissue ischemia of a patient is easily caused when a balloon of the balloon dilatation catheter is kept in a dilatation state for a long time. Comprising an outer tube, an inner tube penetrating through the outer tube and a balloon arranged on the outer tube in a sleeving mode, the outer tube is composed of a first outer tube body and a second outer tube body, the inner tube is composed of a first inner tube body and a second inner tube body, a transition part of an annular structure is installed between the first outer tube body and the second outer tube body, and a blood channel is formed in the transition part in the axial direction in a penetrating mode. The blood channel is communicated between the first inner tube and the second inner tube, and a guide wire is arranged in the blood channel, the first inner tube and the second inner tube in a penetrating mode. When the balloon is kept in an expansion state for a long time, blood of a patient can still penetrate through the balloon to supply blood to far-end myocardium or tissue, so that body injury caused by lack of normal blood supply to the patient is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, in particular to a balloon dilatation catheter with a double-tube structure. Background Art

[0002] The balloon dilatation catheter is an interventional medical device. It is a soft catheter with an expandable balloon at the tip. It is generally a double-lumen structure and is mainly used to dilate narrowed blood vessels. When the balloon catheter is not expanded, it enters the narrow lesion, and then normal saline is injected through the catheter end that remains outside the body to gradually fill the balloon and dilate the narrow lesion. After the treatment is successful, the normal saline is withdrawn to shrink the balloon so that the balloon catheter can be withdrawn outside the body.

[0003] When the balloon dilates the stenotic lesion, the balloon will completely close the lumen of the blood vessel in the dilated area, blocking the perfusion blood flow from the proximal end to the distal end, causing ischemia of the distal myocardium or tissue. For balloon dilation or stent dilation under normal circumstances, the process from balloon inflation to deflation usually takes only a few seconds, and the patient will not be at risk of safety due to ischemia in a short period of time. However, for some harder calcium plaque stenotic lesions, due to their difficult dilation and easy rebound characteristics, it is usually necessary to maintain the dilation state of the balloon for a long time in order to achieve the dilation effect; there are also some cases where drug balloons are needed to dilate stenotic lesions. In order to ensure that the drug on the surface of the balloon membrane is fully in contact with the lesion and absorbed, it is also necessary to maintain the dilation state of the balloon for a long time; in the above cases, since the balloon remains dilated for a long time, it is easy to cause ischemia of the patient's distal myocardium or tissue, which can easily cause harm to the patient. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a double-tube structure balloon dilatation catheter, which solves the problem that the balloon of the balloon dilatation catheter is easily caused to ischemia of the patient's distal myocardium or tissue when the balloon is kept in an expanded state for a long time.

[0005] To achieve the above-mentioned purpose, according to an embodiment of the first aspect of the utility model, a double-tube structured balloon dilatation catheter is proposed, comprising an outer tube, an inner tube passing through the outer tube and a balloon sleeved on the outer tube, the outer tube consisting of a first outer tube and a second outer tube, the inner tube consisting of a first inner tube and a second inner tube, a transition portion with an annular structure is installed between the first outer tube and the second outer tube, a blood channel is axially penetrated through the transition portion, the blood channel is connected between the first inner tube and the second inner tube, and a guide wire is commonly passed through the blood channel, the first inner tube and the second inner tube, and a blood inlet connected to the blood channel is radially penetrated through the curved side wall of the transition portion.

[0006] As a further technical solution of the utility model, the blood channel is a conical structure, the diameter of the end of the blood channel close to the first outer tube is larger than the diameter of the end close to the second outer tube, a matching piston is provided in the blood channel, and the piston is fixedly sleeved on the guide wire.

[0007] As a further technical solution of the utility model, the piston is composed of an annular portion and a conical portion, the conical portion matches the blood channel, and the cross-sectional diameter of the annular portion is equal to the inner diameter of the first inner tube.

[0008] As a further technical solution of the utility model, a first filling cavity is formed between the transition portion and the first outer tube and the first inner tube, a second filling cavity is formed between the transition portion and the second outer tube and the second inner tube, and a plurality of connecting tubes are installed between the first filling cavity and the second filling cavity.

[0009] As a further technical solution of the utility model, multiple connecting tubes are embedded and installed in the transition part, the number of the blood inlets is equal to the number of the connecting tubes, the multiple blood inlets and the multiple connecting tubes are evenly distributed in a ring shape, and the connecting tubes are arranged through the blood inlets.

[0010] As a further technical solution of the utility model, a filling port is connected to the first filling chamber, a plug corresponding to the end of the balloon is installed in the second filling chamber, and the plug is located at the end away from the transition part, and the second filling chamber is provided with a plurality of outlets connected to the balloon.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. In the utility model, by using the blood inlets radially arranged on the curved side wall of the transition portion, when the balloon is kept in a long expanded state, blood can enter the blood channel of the transition portion through multiple blood inlets, and then pass through the balloon through the second inner tube, thereby facilitating blood supply to the patient's distal myocardium or tissue, and effectively avoiding the risk of ischemia in the patient due to long-term expansion of the balloon.

[0013] 2. In the utility model, the position of the piston can be adjusted conveniently by pulling the guide wire, so that the gap between the tapered portion and the blood channel can be adjusted as needed, thereby facilitating the control of the flow rate of the blood supply, and the annular portion is used to facilitate the blocking of the first inner tube, so that the blood entering the blood channel passes through the balloon via the second inner tube to supply the patient's distal myocardium or tissue.

[0014] 3. In the utility model, physiological saline is conveniently injected into the first filling cavity through the filling port, and the physiological saline in the first filling cavity is conveniently introduced into the second filling cavity by using multiple connecting tubes. The physiological saline in the second filling cavity is conveniently blocked by the blockage, so that the physiological saline is conveniently injected into the balloon through multiple outlets to make it swell and expand. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a balloon dilatation catheter with a double-tube structure according to the utility model;

[0016] Figure 2 It is a schematic diagram of the structure of a balloon dilatation catheter with a double-tube structure in the utility model when the piston is separated from the blood channel;

[0017] Figure 3 for Figure 1 A magnified view of part A;

[0018] Figure 4 for Figure 2 A magnified view of part B;

[0019] Figure 5 It is a stereoscopic diagram of the connection part between the piston and the guide wire in a balloon dilatation catheter with a double-tube structure of the utility model;

[0020] Figure 6 It is a side view structural schematic diagram of the transition part in the first embodiment of a balloon dilatation catheter with a double-tube structure of the utility model;

[0021] Figure 7 It is a side structural schematic diagram of the transition portion in Example 2 of a balloon dilatation catheter with a double-tube structure of the utility model.

[0022] In the figure: 1. outer tube; 101. first outer tube; 102. second outer tube; 2. inner tube; 201. first inner tube; 202. second inner tube; 3. balloon; 4. transition part; 5. blood channel; 6. guide wire; 7. blood inlet; 8. piston; 801. annular part; 802. conical part; 9. first filling chamber; 10. second filling chamber; 11. connecting tube; 12. filling port; 13. blockage; 14. outlet. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] Embodiment 1:

[0025] like Figure 1-3As shown, a balloon dilatation catheter with a double sleeve structure comprises an outer tube 1, an inner tube 2 arranged through the outer tube 1, and a balloon 3 sleeved on the outer tube 1, wherein the outer tube 1 is composed of a first outer tube 101 and a second outer tube 102, and the inner tube 2 is composed of a first inner tube 201 and a second inner tube 202, and a transition portion 4 with an annular structure is installed between the first outer tube 101 and the second outer tube 102, and a blood channel 5 is axially penetrated through the transition portion 4, the blood channel 5 is connected between the first inner tube 201 and the second inner tube 202, and a guide wire 6 is commonly penetrated in the blood channel 5, the first inner tube 201 and the second inner tube 202, and a blood inlet 7 connected to the blood channel 5 is radially penetrated on the curved side wall of the transition portion 4, so that blood can enter the blood channel 5 through the blood inlet 7, and then pass through the second inner tube 202 through the balloon 3 to supply blood to the patient's distal myocardium or tissue.

[0026] like Figure 3-5 As shown, the blood channel 5 is a tapered structure, and the end diameter of the blood channel 5 close to the first outer tube 101 is larger than the end diameter close to the second outer tube 102. A matching piston 8 is provided in the blood channel 5, and the piston 8 is fixedly sleeved on the guide wire 6. The guide wire 6 is used to conveniently adjust the position of the piston 8, thereby adjusting the gap between the piston 8 and the blood channel 5, and further adjusting the flow rate of the blood supply. The piston 8 consists of an annular portion 801 and a tapered portion 802. The tapered portion 802 matches the blood channel 5. The cross-sectional diameter of the annular portion 801 is equal to the inner diameter of the first inner tube 201, so that the first inner tube 201 is conveniently blocked, and the blood supply blood is conveniently supplied through the second inner tube 202.

[0027] like Figure 1 , Figure 3 and Figure 6 As shown, a first filling cavity 9 is formed between the transition portion 4 and the first outer tube 101 and the first inner tube 201, and a filling port 12 is connected on the first filling cavity 9 to facilitate the injection of physiological saline. A second filling cavity 10 is formed between the transition portion 4 and the second outer tube 102 and the second inner tube 202, and a plurality of connecting tubes 11 are installed between the first filling cavity 9 and the second filling cavity 10, and the plurality of connecting tubes 11 are embedded and installed in the transition portion 4, and the number of blood inlets 7 and the connecting tubes 11 are equal, and the plurality of blood inlets 7 and the plurality of connecting tubes 11 are evenly distributed in an annular shape, and the connecting tubes 11 are arranged through the blood inlet 7;

[0028] A plug 13 corresponding to the end of the balloon 3 is installed in the second filling chamber 10, and the plug 13 is located at the end away from the transition portion 4. A plurality of outlets 14 connected to the balloon 3 are opened on the second filling chamber 10 to facilitate the injection of physiological saline into the second filling chamber 10 through the outlet 14 into the balloon 3 to make it swell and expand.

[0029] Embodiment 2:

[0030] On the basis of the first embodiment, in order to increase the blood volume of the blood inlet 7, in this embodiment, Figure 7 As shown, a plurality of connecting tubes 11 embedded in the transition portion 4 are alternately arranged with a plurality of blood inlets 7. This way, the connecting tubes 11 do not pass through the blood inlet 7, thereby not causing any obstruction to the blood entering the blood inlet 7, which is beneficial to improving the efficiency of blood entry.

[0031] The working principle of the utility model is as follows: the guide wire 6 is used to make the balloon 3 reach the stenotic lesion site in a non-expanded state, and physiological saline is injected into the first filling chamber 9 through the filling port 12, and then the physiological saline enters the second filling chamber 10 blocked by the blockage 13 through the connecting tube 11, so that the physiological saline is injected into the balloon 3 through the outlet 14 to make it expand. If the balloon 3 completely closes the vascular lumen in the expansion area, blood will enter the transition part 4 through multiple blood inlets 7 at this time, and the guide wire 6 is pulled to adjust the position of the piston 8 to create a gap between the tapered part 802 and the blood channel 5, so that blood enters the blood channel 5, and then flows out through the balloon 3 through the second inner tube 202, so as to supply blood to the patient's distal myocardium or tissue. By adjusting the size of the gap between the tapered part 802 and the blood channel 5, the flow rate of the blood supply can be adjusted as needed, so that when the balloon 3 is kept in an expanded state for a long time, the blood will not be blocked by it, ensuring that the blood can still supply blood to the patient's distal myocardium or tissue, so that the patient will not have the risk of ischemia.

[0032] The above embodiments are only used to illustrate the technical method of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical method of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the utility model.

Claims

1. A double-tube balloon dilatation catheter, comprising an outer tube (1), an inner tube (2) passing through the outer tube (1), and a balloon (3) sleeved on the outer tube (1), characterized in that: The outer tube (1) is composed of a first outer tube (101) and a second outer tube (102); the inner tube (2) is composed of a first inner tube (201) and a second inner tube (202); a transition portion (4) of an annular structure is installed between the first outer tube (101) and the second outer tube (102); a blood channel (5) is axially penetrated through the transition portion (4); the blood channel (5) is connected between the first inner tube (201) and the second inner tube (202); a guide wire (6) is commonly penetrated through the blood channel (5), the first inner tube (201) and the second inner tube (202); a blood inlet (7) connected to the blood channel (5) is radially penetrated through the curved side wall of the transition portion (4).

2. The double-tube balloon dilatation catheter according to claim 1, characterized in that: The blood channel (5) is a conical structure, the diameter of the end of the blood channel (5) close to the first outer tube (101) is larger than the diameter of the end close to the second outer tube (102), and a matching piston (8) is provided in the blood channel (5), and the piston (8) is fixedly sleeved on the guide wire (6).

3. A double-tube balloon dilatation catheter according to claim 2, characterized in that: The piston (8) is composed of an annular portion (801) and a conical portion (802), wherein the conical portion (802) matches the blood channel (5), and the cross-sectional diameter of the annular portion (801) is equal to the inner diameter of the first inner tube (201).

4. The double-tube balloon dilatation catheter according to claim 1, characterized in that: A first filling cavity (9) is formed between the transition portion (4) and the first outer tube (101) and the first inner tube (201); a second filling cavity (10) is formed between the transition portion (4) and the second outer tube (102) and the second inner tube (202); and a plurality of connecting tubes (11) are installed between the first filling cavity (9) and the second filling cavity (10).

5. The double-tube balloon dilatation catheter according to claim 4, characterized in that: The plurality of connecting tubes (11) are embedded and installed in the transition portion (4); the number of the blood inlets (7) is equal to the number of the connecting tubes (11); the plurality of blood inlets (7) and the plurality of connecting tubes (11) are evenly distributed in a ring shape; and the connecting tubes (11) are arranged to pass through the blood inlets (7).

6. The double-tube balloon dilatation catheter according to claim 4, characterized in that: The first filling chamber (9) is connected to a filling port (12), a plug (13) corresponding to the end of the balloon (3) is installed in the second filling chamber (10), and the plug (13) is located at the end away from the transition portion (4), and the second filling chamber (10) is provided with a plurality of outlets (14) connected to the balloon (3).

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