Balloon catheter

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a balloon catheter. The outer catheter is connected and communicated with the near end of the balloon body; the inner catheter sequentially penetrates through the outer catheter and the balloon body; the guide wire cavity is formed in the inner catheter and is used for a guide wire to pass through; the coating layer is arranged on the outer wall of the balloon body; and the organization structure of the coating layer is an organization structure of which the radial diameter is changed along with the change of the axial length. According to the technical scheme, the wrapping layer with the specific tissue structure is additionally arranged on the outer surface of the balloon body so that the balloon body can be prevented from being further expanded or even exploded along with pressure increase, meanwhile, the influence of internal environment characteristics can be avoided, and in other words, the non-compliance of the balloon is enhanced through a non-material means.

Description

Technical Field

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

[0002] Balloon catheters have been widely used in the diagnosis and treatment of cardiovascular diseases. Usually, the end of the catheter is inserted into the body, and when the balloon reaches the target position, the pressure is increased to expand the balloon, thereby creating an operating space inside the body. For example, before implanting an artificial heart valve, it is necessary to pre-expand the bicuspid, calcified, and other irregular valves. That is, the corresponding position can be expanded by filling the balloon body cavity to the rated pressure. For example, if the artificial valve is poorly formed after implantation, this balloon can be used for post-expansion to make the artificial valve or stent more attached or anchored in the corresponding position. Or the balloon catheter can also be used for the expansion of the urinary tract or prostate. Or as a fistula for blood vessels or natural cavities, the ultra-high pressure can be used to expand the tiny holes to the required size without increasing the size of the incision. Or it can be used for peripheral or other narrow blood vessels, and the stenosis can be expanded by the balloon to make the cavity unobstructed.

[0003] The compliance of a balloon refers to the change in volume for each unit change in pressure. For most balloon catheters, the length does not change with increasing pressure. Therefore, the change in volume is mainly reflected in the change in the diameter of the balloon. The compliance of a balloon mainly depends on the material of the balloon, such as polyurethane, latex, silicone, PVC (polyvinyl chloride) or other highly elastic materials. High-compliance balloons usually have low rated pressures. When the force provided by the balloon is insufficient, they are greatly affected by the characteristics of the internal environment, are prone to failure, and cannot meet surgical requirements. Therefore, the non-compliant balloons with thin walls and less compliant materials are generally widely used.

[0004] A non-compliant balloon is a balloon whose actual diameter does not change much as the filling pressure increases. Currently, non-compliant balloon catheters are mostly blow-molded from polymer materials, mostly PE (polyethylene), PET (polyethylene terephthalate), nylon or fiber-reinforced composite materials.

[0005] However, non-compliant balloons cannot reach very high pressures due to limitations in materials and thickness, and insufficient pressure will result in insufficient expansion and the expansion or molding effects will be lost. Utility Model Content

[0006] The utility model provides a balloon catheter, which is used to solve the problem that the current balloon catheter material cannot take into account both shape control and high pressure resistance.

[0007] For the convenience of explanation, the utility model defines the end close to the operator as the proximal end, and the end far from the operator as the distal end.

[0008] In order to solve the above technical problems, the technical solution of the utility model is: the balloon catheter includes a balloon body, an outer catheter connected to and communicated with the proximal end of the balloon body, an inner catheter passing through the outer catheter and the balloon body in sequence, a guidewire cavity arranged in the inner catheter for the guidewire to pass through, and a coating layer arranged on the outer wall of the balloon, the tissue structure of the coating layer is a tissue structure in which the radial diameter changes with the axial length.

[0009] When the balloon body is inflated, the diameter of the coating increases but the length shortens. When the balloon body is deflated and restored, the length of the coating becomes and the diameter decreases. That is, the rigidity of the coating is the tissue structure rather than the material. Therefore, it can provide the necessary support for the internal balloon body. Therefore, when the balloon body is made of compliant material, the coating will not be affected by the characteristics of the internal environment and can exert necessary control over the shape. When the balloon body is made of non-compliant material, the pressure it can withstand can be increased.

[0010] Optionally, the covering layer has a weft knitted fabric structure, preferably a double rib knitted fabric structure.

[0011] Optionally, the coating layer is woven from a plurality of fibers, and the material of the fibers is selected from metal or polymer material.

[0012] Optionally, the fibers of the coating layer are loaded with drugs.

[0013] Optionally, the balloon body is made of compliant material.

[0014] Optionally, the compliant material is selected from polyurethane, latex, silicone, silicone rubber or high resilience rubber.

[0015] Optionally, a tapered end is provided at the distal end of the balloon body, and the guidewire cavity extends from the distal end of the inner catheter to the distal end of the tapered end.

[0016] Optionally, the balloon body includes a distal closing end, a middle expansion portion and a proximal closing end from the distal end to the proximal end, the distal closing end is connected to the tapered end, and the proximal closing end is connected to the outer catheter.

[0017] Optionally, the distal end of the coating layer is fixedly connected to the distal end closing portion, and the proximal end of the coating layer is fixedly connected to the proximal end closing portion, and the coating layer changes with changes in the middle expansion portion.

[0018] Optionally, the proximal ends of the outer catheter and the inner catheter are connected with Y-valves for the entry and exit of the guide wire and the filling and exhaust of gas.

[0019] The technical solution provided by the utility model is to add a coating layer containing a specific tissue structure on the outer surface of the balloon to limit the further expansion or even explosion of the balloon as the pressure increases, while at the same time being able to avoid the influence of the internal environmental characteristics, that is, to enhance the non-compliance of the balloon by non-material means. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a specific implementation mode of the balloon catheter of the utility model;

[0021] Figure 2 It is a cross-sectional view of a specific implementation manner of the balloon catheter described in the utility model.

[0022] As shown in the figure:

[0023] 10-balloon body, 11-distal end closing portion, 12-middle expansion portion, 13-proximal end closing portion, 20-outer catheter, 30-conical end portion, 40-inner catheter, 50-guidewire cavity, 60-coating layer. DETAILED DESCRIPTION

[0024] For ease of understanding, the balloon catheter is described below in conjunction with embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation and positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1 and 2As shown, the balloon catheter includes a balloon body 10, an outer catheter 20 connected to and communicated with the proximal end of the balloon body 10, a tapered end 30 connected to the distal end of the balloon body 10, an inner catheter 40 passing through the outer catheter 20 and the balloon body 10 in sequence, a guidewire cavity 50 arranged in the inner catheter 40 for the guidewire to pass through, and a coating layer 60 arranged on the outer wall of the balloon body 10, wherein the guidewire cavity 50 extends from the distal end of the inner catheter 40 to the distal end of the tapered end 30.

[0028] Continue as Figure 2 As shown, the balloon body 10 includes a distal closing end 11, a middle expansion portion 12 and a proximal closing end 13 from the distal end to the proximal end, the distal closing end 11 is connected to the tapered end 30, and the proximal closing end 13 is connected to the outer catheter 20.

[0029] Continue to see Figure 1 and 2 The distal end of the coating layer 60 is fixedly connected to the distal end closing 11 , and the proximal end of the coating layer 60 is fixedly connected to the proximal end closing 13 .

[0030] The proximal ends of the outer catheter 20 and the inner catheter 40 are connected with a Y-valve (not shown) for the guide wire to enter and exit and for gas filling and exhausting.

[0031] The tissue structure of the coating layer 60 is a tissue structure in which the radial diameter changes with the change of the axial length. Compared with the warp knitted fabric structure, the weft knitted fabric structure has better extensibility in both the longitudinal and transverse directions, so the present embodiment preferably uses the weft knitted fabric structure, which includes the weft plain knitted fabric structure, the rib knitted fabric structure and the double rib knitted fabric structure.

[0032] Among them, the weft plain knitted fabric has great tensile deformation characteristics in both the longitudinal and transverse directions. The deformation mechanism is the process of transition from the balance of the fabric coil structure before deformation to a new equilibrium state.

[0033] The biggest feature of rib knitting is that it has greater lateral extensibility and elasticity, while its longitudinal extensibility and elasticity are similar to those of plain knitting. When the external force is removed, the rib knitting has a great ability to recover to its original state.

[0034] Double rib knitted fabric is composed of two rib structures, so its elasticity and extensibility are smaller than rib structures and its size is more stable.

[0035] In summary, it can be found that in order to obtain higher stability and non-compliance, it is more appropriate to choose a double rib knitted structure with different elasticity in two directions and which is relatively stable.

[0036] The coating layer 60 is woven from a plurality of fibers made of metal or polymer materials, preferably a titanium alloy material having biocompatibility. In addition, the surface of the titanium alloy may be loaded with drugs.

[0037] The material of the balloon body 10 can be selected from compliant materials, such as polyurethane, latex, silicone, silicone rubber or high resilience rubber, because it is clamped by the coating layer 60 .

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them. Although the utility model has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A balloon catheter, characterized in that: The invention comprises a balloon body, an outer catheter connected to and communicating with the proximal end of the balloon body, an inner catheter passing through the outer catheter and the balloon body in sequence, a guidewire cavity arranged in the inner catheter for the guidewire to pass through, and a coating layer arranged on the outer wall of the balloon body, wherein the tissue structure of the coating layer is a tissue structure in which the radial diameter changes with the axial length.

2. The balloon catheter according to claim 1, characterized in that: The organizational structure of the covering layer is a weft knitted fabric structure.

3. The balloon catheter according to claim 1, characterized in that: The coating layer is woven from a plurality of fibers, and the material of the fibers is selected from metal or polymer material.

4. The balloon catheter according to claim 1, characterized in that: The fibers of the coating layer are loaded with drugs.

5. The balloon catheter according to claim 1, characterized in that: The material of the balloon body is compliant material.

6. The balloon catheter according to claim 1, characterized in that: The distal end of the balloon body is provided with a tapered end portion, and the guidewire cavity extends from the distal end of the inner catheter to the distal end of the tapered end portion.

7. The balloon catheter according to claim 6, characterized in that: The balloon body comprises a distal end closing portion, a middle expansion portion and a proximal end closing portion in sequence from the distal end to the proximal end, the distal end closing portion is connected to the tapered end portion, and the proximal end closing portion is connected to the outer catheter.

8. The balloon catheter according to claim 7, characterized in that: The distal end of the coating layer is fixedly connected to the distal end closing, and the proximal end of the coating layer is fixedly connected to the proximal end closing, and the coating layer changes with the change of the middle expansion part.

9. The balloon catheter according to claim 1, characterized in that: The proximal ends of the outer catheter and the inner catheter are connected with a Y valve for the guide wire to enter and exit and for gas filling and exhausting.

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