Cryogenic balloon catheter having heating function

Abstract

To provide a cryogenic balloon catheter having a heating function.SOLUTION: A cryogenic balloon catheter comprises a catheter, a thermostat 3 and an external power source 2. The outer wall of the catheter comprises an inner layer 101, a middle layer and an outer layer 103, which are sequentially arranged from inside to outside. The middle layer comprises a metal woven mesh 102, and the metal woven mesh, the thermostat and the external power source form a power supply circuit. The metal woven mesh having a heat conduction function in the middle layer of the outer wall of the cryogenic balloon catheter is connected to the external power source, such that the metal woven mesh can generate heat after being powered, so as to ensure that the temperature of the outer surface of the catheter is maintained within set temperatures, thereby ensuring the cryogenic ablation effect, and also can solve a series of problems such as blood vessels being frozen outside the cryogenic balloon catheter to cause necrosis of a human tissue due to transmitting cold energy to the outer surface of the cryogenic balloon catheter when low-temperature fluid is introduced into the cryogenic balloon catheter.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This application relates to the technical field of cryoablation instruments, and more specifically, to a cryoballoon catheter with a heating function.

Background Art

[0002] In the medical industry, current cryoballoon catheters for interventional surgery have the following problems.

[0003] The catheter enters the human body through the blood vessels of the human body. The outer diameter dimension is generally 3 - 4 mm. To ensure sufficient inner diameter space, the wall thickness is very thin. When a cryogenic fluid is introduced into the balloon catheter, due to the thin wall thickness, the heat insulation effect is not obvious, and the refrigeration energy is transmitted from inside the catheter to the outer surface of the catheter. When the temperature of the fluid introduced into the catheter is low enough (for example, < - 80°C), it will affect the blood flowing on the outer surface of the catheter, and further freeze the blood vessels, causing necrosis of human tissues. As a result, the life of the surgical patient is put at risk.

[0004] Therefore, on the premise of ensuring the cryoablation effect, it is necessary to design a cryoballoon catheter that can avoid the temperature on the outer surface of the catheter being too low and damaging human tissues.

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of the above circumstances, the purpose of this application is to provide a cryoballoon catheter with a heating function to solve the problems in the prior art that when a cryogenic fluid is introduced into the cryoballoon catheter, it will affect the blood flowing on the outer surface of the catheter, and further freeze the blood vessels, causing necrosis of human tissues.

Means for Solving the Problems

[0006] To solve the above technical problems, the technical solution of the present application is as follows.

[0007] A cryoballon catheter having a heating function, including a catheter and an external power source, the outer wall of the catheter includes an inner layer, an intermediate layer, and an outer layer provided in order from the inside to the outside, the intermediate layer includes a metal braided mesh, and the metal braided mesh is connected to a power supply circuit of the external power source.

[0008] Furthermore, the metal braided mesh is a lattice-shaped metal wire braided mesh formed by weaving a plurality of metal wires with each other.

[0009] Furthermore, a thermostat is further provided in the power supply circuit composed of the external power source and the metal braided mesh.

[0010] Furthermore, the outer layer is made of a polyether block amide resin material.

[0011] Furthermore, the inner layer is made of a polyether block amide resin material.

[0012] Furthermore, a thermocouple embedded in the outer wall of the catheter is electrically connected to the thermostat.

[0013] Furthermore, the embedding position of the thermocouple in the catheter is in the intermediate layer of the catheter.

[0014] Furthermore, the metal braided mesh has a proximal end and a distal end, and the positive and negative electrodes of each metal wire in the metal braided mesh are drawn out from the proximal end.

[0015] Furthermore, a conductive ring is provided at the distal end of the metal braided mesh, and the positive and negative electrodes of each metal wire in the metal braided mesh are connected to the conductive ring at the distal end.

[0016] Furthermore, a deflection guide wire is provided outside the outer wall of the catheter, and the deflection guide wire, the metal braided mesh, and the external power supply constitute a power supply circuit.

Advantages of the Invention

[0017] The technical solution of the present application has the following advantages.

[0018] 1. According to the cryo-balloon catheter with a heating function according to the present application, a metal braided mesh with a heat conduction function is provided in the intermediate layer of the outer wall of the cryo-balloon catheter. The metal braided mesh is connected to an external power supply and can generate heat when energized, so as to ensure that the temperature of the outer surface of the catheter is maintained within the set temperature, and in this way, not only can the effect of cryoablation be ensured, but also the problem that the low-temperature fluid in the cryo-balloon catheter transfers refrigerating energy outside the catheter and causes necrosis of human tissue can be prevented.

[0019] 2. According to the cryo-balloon catheter with a heating function according to the present application, the lattice-shaped metal wire braided mesh formed by weaving a plurality of metal wires together has a large heat generation amount after energization and can generate heat uniformly at each location on the outer wall of the catheter, so as to better ensure that the temperature at each location on the outer surface of the catheter is maintained within the required temperature range, and it is possible to avoid the non-uniform heat generation at each location on the catheter affecting the human tissue outside the catheter.

[0020] 3. According to the cryo-balloon catheter with a heating function according to the present application, a thermostat is provided in the power supply circuit composed of the external power supply and the metal braided mesh. The thermostat controls the heat generation power of the metal braided mesh and can better control the temperature of the outer wall of the catheter within the required temperature range.

[0021] 4. According to the cryoballoon catheter with a heating function according to the present application, the thermocouple connected to the thermostat is embedded in the intermediate layer of the catheter, so that the heating temperature of the metal braided mesh can be measured more accurately at a closer distance, and the measured temperature signal can be fed back to the thermostat. The thermostat can control the heating power of the metal braided mesh more timely and accurately, which is beneficial to stably maintaining the temperature of the catheter outer wall within the required temperature range for a long time.

[0022] 5. According to the cryoballoon catheter with a heating function according to the present application, the positive and negative electrodes of each metal wire in the metal braided mesh are drawn out from the proximal end and connected to the conductive ring at the distal end of the metal braided mesh. In this way, a plurality of metal wires form a parallel circuit, and the heat generation amount of the metal braided mesh can be increased.

[0023] 6. According to the cryoballoon catheter with a heating function according to the present application, a deflection guide wire is provided on the outer wall of the catheter. The deflection guide wire, the metal braided mesh and the external power supply can form a power supply circuit. In this way, the heat generation capacity of the metal braided mesh can be utilized to the maximum, and the heating voltage of the external power supply can be further reduced.

[0024] To more clearly explain the specific embodiments of the present application or the technical solutions of the prior art, the drawings required for the description of the specific embodiments or the prior art will be briefly described below. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can obtain other drawings based on these drawings without creative labor.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0026] Hereinafter, with reference to the drawings, the technical solution of the present application will be clearly and completely described. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. All other embodiments obtained by those skilled in the art without creative labor based on the embodiments of the present application belong to the protection scope of the present application.

[0027] In the description of the present application, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is the orientation or positional relationship based on the drawings, and is merely for explaining the present application and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation or be configured and operated in a specific orientation, so it should not be understood as limiting the present application. Also, the terms "first", "second", "third" are used only for the purpose of description and should not be understood as indicating or implying relative importance.

[0028] In the description of the present application, unless otherwise clearly defined and limited, the terms "mount", "connect", "couple" should be understood in a broad sense. For example, it may be a fixed connection, a removable connection, or an integral connection, a mechanical connection, or an electrical connection, a direct connection, an indirect connection through an intermediate medium, or a communication inside two elements. Those skilled in the art can understand the specific meaning of the above terms in the present application according to specific situations.

[0029] Example 1 The cryoballoon catheter with a heating function shown in FIGS. 1 and 2 is applied in the field of cryomedical instruments. The temperature of the cryogenic fluid introduced into the cryoballoon catheter is usually -80°C or lower. The cryoballoon catheter includes a catheter and an external power source 2. The outer wall of the catheter includes an inner layer 101, an intermediate layer, and an outer layer 103 provided in order from the inside to the outside. Both the inner layer 101 and the outer layer 103 are made of PEBAX (polyether block amide resin) material, and the intermediate layer is a metal braided mesh 102. The metal braided mesh 102 is connected to the power supply circuit of the external power source 2.

[0030] According to this cryoballoon catheter with a heating function, a metal braided mesh 102 with a heat conduction function is provided in the intermediate layer of the outer wall of the cryoballoon catheter. The metal braided mesh 102 is connected to the external power source 2 and can generate heat when energized, ensuring that the temperature of the outer surface of the catheter is maintained within a set temperature (for example: 10 ± 2°C). In this way, not only can the effect of cryoablation be ensured, but when a cryogenic fluid is introduced into the cryoballoon catheter, a series of problems such as the cryogenic fluid transmitting freezing energy to the outer surface of the cryoballoon catheter and freezing the blood vessels outside the cryoballoon catheter, causing necrosis of human tissue, can be better solved.

[0031] In this embodiment, a thermostat 3 is further provided in the power supply circuit composed of the external power source 2 and the metal braided mesh 102, and a thermocouple 4 embedded in the intermediate layer of the catheter is electrically connected to the thermostat 3. By being embedded in the intermediate layer of the catheter, the thermocouple 4 connected to the thermostat 3 can measure the heating temperature of the metal braided mesh 102 more accurately at a closer distance and feedback the measured temperature signal to the thermostat 3. The thermostat 3 can control the heating power of the metal braided mesh 102 more timely and accurately, which is beneficial to stably maintaining the temperature of the outer wall of the catheter within the required temperature range for a long time.

[0032] As shown in FIG. 2, the metal braided mesh 102 is a lattice-shaped metal wire braided mesh formed by weaving a plurality of metal wires together, and is woven by a special weaving process. The metal braided mesh has a proximal end and a distal end. The positive and negative electrodes of each metal wire in the metal braided mesh are drawn out from the proximal end. A conductive ring 104 is provided at the distal end of the metal braided mesh. The positive and negative electrodes of each metal wire in the metal braided mesh are connected to the conductive ring 104 at the distal end. Such a lattice-shaped metal wire braided mesh forms a parallel circuit with a plurality of metal wires, has a large amount of heat generated after energization, and can generate heat uniformly at each location on the outer wall of the catheter, thereby better ensuring that the temperature at each location on the outer surface of the catheter is maintained within the required temperature range, and avoiding the influence of non-uniform heat generation at each location of the catheter on the human tissue outside the catheter.

[0033] Example 2 The cryoballoon catheter with a heating function shown in FIG. 3 is different from Example 1 in that a deflection guide wire 5 is provided on the outer wall of the catheter. The deflection guide wire 5, the metal braided mesh 102, the thermostat 3 and the external power supply 2 jointly form a power supply circuit. The metal braided mesh 102 is connected to the positive electrode of the external power supply 2, and the deflection guide wire 5 is connected to the negative electrode of the external power supply 2. Compared with the solution in Example 1 where the positive and negative electrodes of the metal braided mesh 102 are drawn out from the same end and connected to the positive and negative electrodes of the external power supply 2 respectively, this solution can make the most of the heat generation ability of the metal braided mesh 102 and further reduce the heating voltage of the external power supply 2.

[0034] Obviously, the above embodiments are merely examples for clear explanation and do not limit the embodiments. Those skilled in the art can make various other changes and modifications based on the above description. It is not necessary to cover all embodiments here, nor is it possible to cover all embodiments. The obvious changes and modifications derived therefrom also belong to the protection scope of this application.

Explanation of Reference Numerals

[0035] 101, inner layer 102. Metal braided mesh 103. Outer layer 104. Conductive ring 2. External power supply 3. Thermostat 4. Thermocouple 5. Deflection guide wire

Claims

1. A cryoballoon catheter with a heating function, comprising: a catheter and an external power source (2); the outer wall of the catheter comprises an inner layer (101), an intermediate layer and an outer layer (103) arranged in this order from inside to outside; the intermediate layer comprises a metal braided mesh (102); and the metal braided mesh (102) is connected to the external power source (2) to form a power supply circuit; A cryoballoon catheter with a heating function, wherein a deflection guidewire (5) is provided on the outer wall of the catheter, the deflection guidewire (5), the metal braided mesh (102) and the external power source (2) jointly constitute a power supply circuit, the deflection guidewire (5) has a conductive function, and in the power supply circuit, the metal braided mesh (102) is connected to the positive pole of the external power source (2), and the deflection guidewire (5) is connected to the negative pole of the external power source (2).

2. A cryoballoon catheter with a heating function, comprising: a catheter and an external power source (2); the outer wall of the catheter comprises an inner layer (101), an intermediate layer and an outer layer (103) arranged in this order from inside to outside; the intermediate layer comprises a metal braided mesh (102); and the metal braided mesh (102) is connected to the external power source (2) to form a power supply circuit; The metal braided mesh (102) is a lattice-shaped metal wire braided mesh formed by a plurality of metal wires, a lattice-shaped braided metal wire mesh having a proximal end and a distal end, each metal wire in the lattice-shaped braided metal wire mesh being pulled out from the proximal end so as to be connected to a positive electrode or a negative electrode of the external power source (2), a conductive ring (104) being provided at the distal end of the lattice-shaped braided metal wire mesh, each metal wire in the lattice-shaped braided metal wire mesh being connected to the conductive ring (104) at the distal end, and the multiple metal wires of the lattice-shaped braided metal wire mesh forming a parallel circuit.

3. 3. A cryoballoon catheter with heating function as described in claim 1 or 2, characterized in that the power supply circuit is further provided with a thermostat (3), and a thermocouple (4) embedded in the outer wall of the catheter is electrically connected to the thermostat (3).

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