CN110101956A - Guiding catheter - Google Patents

Abstract

The present invention relates to medical instruments fields, provide a kind of guiding catheter.The guiding catheter includes catheter body (1), cooling element (2), heat-conducting plate (3) and semiconductor chilling plate (4)；The cooling element (2) is set in the catheter body (1), and extend along the length direction of the catheter body (1), one end of the cooling element (2) is connect with the heat-conducting plate (3), the heat-conducting plate (3) is attached on the semiconductor chilling plate (4), and the conducting wire (5) for connecting power supply is provided on the cooling piece (4).The present invention controls cryogenic temperature by the size of current of the direct current of control load, so that guiding catheter is achieved the purpose that cooling, and temperature adjusting is simple and reliable, avoids the demand in vitro to blood cooling, reduces the damage to human body and blood.

Description

guide catheter

technical field

The invention relates to the field of medical devices, in particular to a guiding catheter.

Background technique

According to research, brain cells have obvious changes in temperature, and every 1°C decrease in body temperature can reduce the metabolic rate by 5% to 6%. Mild hypothermia therapy is currently the most promising neuroprotective method, and it is also the only clinically proven effective treatment method for global ischemic brain injury after cardiopulmonary resuscitation.

Guide catheter is a common device inserted into human blood vessels during interventional surgery. Its main functions are to deliver interventional therapy devices, inject contrast agents and drugs, and monitor intracoronary pressure. According to different anatomy and purposes, guiding catheters are designed with various shapes. Existing guiding catheters have various specifications and models. Although there are certain differences in their shapes, they often have similarities.

During the treatment process of catheterization through the femoral artery to the cerebral blood vessels, due to the need for a long guide catheter, the flow length in the human body will be relatively long, which will cause cooler blood to enter from the femoral artery to the cerebral blood vessels When the cold blood absorbs part of the body temperature, the temperature reaching the blood vessels in the brain is not low enough, resulting in a decline in the therapeutic effect.

Therefore, how to reduce the temperature of the blood vessel when using the guide catheter has become an urgent problem to be solved by those skilled in the art.

Contents of the invention

The purpose of the present invention is to provide a guide catheter to solve the problem that the guide catheter in the prior art cannot be cooled.

In order to achieve the above purpose, the present invention provides a guiding catheter, which includes a catheter body, a cooling component, a heat conducting plate and a semiconductor cooling chip;

The cooling component is arranged in the conduit body and extends along the length direction of the conduit body. One end of the cooling component is connected to the heat conduction plate, and the heat conduction plate is attached to the semiconductor cooling sheet. The refrigerating sheet is provided with wires for connecting to a power supply.

Optionally, the cooling component includes a copper wire, the copper wire is arranged in the inner channel of the conduit body, and extends along the length direction of the conduit body, and one end of the copper wire is connected to the heat conducting plate .

Optionally, the copper wire is helical.

Optionally, a biologically inert film is formed on the outer surface of the copper wire.

Optionally, one end of the copper wire is fixed on the inner wall of the conduit body, and the other end passes through the inner wall of the conduit body and is connected to the heat conducting plate.

Optionally, the end of the heat conducting plate connected to the copper wire is in the shape of a sharp knife.

Optionally, the cooling component includes a braided mesh, the braided mesh extends along the length direction of the conduit body, and one end of the braided mesh is connected to the heat conducting plate.

Optionally, the braided mesh is copper braided mesh.

Optionally, the tube wall of the catheter body includes an outer tube wall and an inner tube wall, and the braided mesh is sandwiched between the outer tube wall and the inner tube wall.

Optionally, the outer pipe wall is coated with polyethylene, and the inner pipe wall is coated with nylon polytetrafluoroethylene.

The invention controls the temperature through the semiconductor refrigerating sheet, the temperature control accuracy is high, the stable temperature of the semiconductor refrigerating sheet can be guaranteed by keeping the input of direct current stable, the adjustment is simple and reliable, avoiding the need for blood cooling outside the body, and reducing the damage to the human body and blood.

Description of drawings

Fig. 1 is a structural schematic diagram of a guide catheter in an embodiment of the present invention, in which the catheter body is cut in the axial direction;

Fig. 2 is a schematic structural view of the guiding catheter in another embodiment of the present invention, in which the catheter body is sectioned in the axial direction.

Reference signs:

1-catheter body; 11-outer pipe wall; 12-inner pipe wall;

2-cooling parts; 3-heat conduction plate; 4-semiconductor cooling sheet; 5-wire.

Detailed ways

In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are some, not all, embodiments of the present invention. The specific embodiments described here are only used to explain the present invention, but not to limit the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention belong to the protection scope of the present invention.

Referring to FIG. 1 , it shows a schematic view of the structure of the guiding catheter in this embodiment. Since the guiding catheter is relatively long, the entire guiding catheter is not fully shown. The guide catheter provided in this embodiment includes a catheter body 1 (shown in the figure as a cut-away structure), a cooling component 2, a heat conduction plate 3, and a semiconductor cooling chip 4; the cooling component 2 is arranged on the catheter body 1 and extending along the length direction of the conduit body 1, one end of the cooling component 2 is connected to the heat conduction plate 3, and the heat conduction plate 3 is attached to the semiconductor cooling sheet 4, and the cooling sheet 4 A wire 5 for connecting to a power supply is provided on the top. Among them, the semiconductor cooling chip 4 is a heat pump, which is usually used in some occasions where the space is limited, the reliability is high, and there is no refrigerant pollution. The semiconductor cooling plate 4 can absorb the heat of the heat conduction plate 3, and the heat conduction plate 3 absorbs the heat of the cooling component 2, so that the cooling component 2 can achieve the purpose of cooling, thereby ensuring that the blood flowing through the guiding catheter is kept at a low temperature state, and the low temperature blood Sending it to the specific cerebral blood supply artery area has a more ideal guiding significance for treatment. On the other hand, the temperature is controlled by the semiconductor cooling chip 4, the temperature control accuracy is high, and the stable temperature of the semiconductor cooling chip 4 can be guaranteed by keeping the input of direct current stable. Blood damage.

Various structural forms can be adopted for the cooling part 2, as shown in Figure 1, the cooling part 2 can include copper wires, and the copper wires are arranged in the internal channel of the catheter body 1 and extend along the length direction of the catheter body 1, One end of the copper wire is connected to the heat conducting plate 3 . In order to increase the contact area with the blood and better absorb blood heat, the copper wire can be arranged in a spiral shape, that is, the shape of a spring, and the number of copper wires can also be multiple, as shown in Figure 1. Using the schematic diagram of one copper wire, those skilled in the art can set more wires according to requirements. Copper wire has better heat transfer performance, which can ensure the timeliness of cooling.

In a specific embodiment, a biologically inert film is formed on the outer surface of the copper wire. The biologically inert film can be plated on by PECVD (Plasma Enhanced Chemical Vapor Deposition, referring to plasma enhanced chemical vapor deposition method). Forming a biologically inert film on the outer surface of the copper wire can prevent the copper wire from directly contacting the blood, greatly reducing the possibility of toxicity to the blood.

In a specific embodiment, one end of the copper wire is fixed on the inner wall of the conduit body 1 , and the other end passes through the inner wall of the conduit body 1 and is connected to the heat conducting plate 3 . In order to facilitate the connection between the copper wire and the inner wall of the catheter body 1, the catheter body 1 can be provided with corners near both ends, and the copper wire can be connected at the corner position. As shown in Figure 1, a corner structure is set at the entrance of the catheter body 1 , the copper wire is directly connected to the corner structure, and passes through the inner wall of the conduit body 1 to connect with the heat conducting plate 3 .

Continuing to refer to Fig. 1, the heat conduction plate 3 can be a copper sheet, and the heat conduction plate 3 and the semiconductor refrigeration sheet 4 are closely bonded. On the other hand, it can prevent the heat conducting plate 3 from absorbing excess heat from the outside.

In the above scheme, the guiding conduit can also be provided with a housing on the outside of the semiconductor refrigeration sheet 4 and the heat conduction plate 3 to protect the semiconductor refrigeration sheet 4 and the heat conduction plate 3. The shape of the housing can be based on the semiconductor refrigeration sheet 4 and the heat conduction plate 3 The shape is designed and is not specifically limited here.

For the cooling component 2, in addition to the solution of using copper wire, it can also be in the form of braided mesh. Referring to FIG. 2 , it shows a schematic structural diagram of the cooling component 2 including a braided mesh. Similarly, in order to improve the heat absorption effect, the braided mesh may be a copper braided mesh.

Referring to FIG. 2 , the tube wall of the catheter body 1 includes an outer tube wall 11 and an inner tube wall 12 , and the braided mesh is sandwiched between the outer tube wall 11 and the inner tube wall 12 . With this structure, on the one hand, it can ensure the absorption of heat, and on the other hand, it can play a certain supporting role for the catheter body 1 to ensure the structural strength of the catheter body 1; in addition, the braided mesh is arranged on the outer tube wall 11 and the inner tube wall 12 Avoid contact with blood. The braided mesh can be braided by copper wires, and the heat conducting plate 3 is welded together with the lower ends of all the copper wires of the braided mesh to ensure sufficient heat absorption of the heat conducting plate 3 . Increase the contact area with the semiconductor cooling plate 4 through the heat conduction plate 3 to ensure that the low temperature is quickly transferred to the braided mesh; the blood is separated from the braided mesh by the wrapping of the outer tube wall 11 and the inner tube wall 12 to prevent the braided mesh from directly contacting the blood Contact to avoid toxicity to blood.

In this embodiment, the outer tube wall 11 is coated with polyethylene, and the inner tube wall 12 is coated with nylon polytetrafluoroethylene. During the working process, first pass direct current to the two wires 5 of the semiconductor refrigeration sheet 4 until the temperature of the braided mesh reaches the required low temperature, then insert the guiding catheter in this state into the blood vessel of the human body through the femoral artery, and at the same time pass it into the body The cooled blood keeps the current of the direct current constant to ensure the constant cooling temperature of the semiconductor refrigerating sheet 4. Due to the good thermal conductivity of copper, it can maintain a low temperature state for a long time. When the blood flows through the catheter body 1, the temperature of the human body will first It is passed to the braided mesh in a low-temperature state, and then passed to the low-temperature blood, so as to ensure that the temperature of the blood flowing out is lower than that of the low-temperature state without the braided mesh.

For the cooling component 2, the technical solution of the copper wire and the braided net can also be combined, that is, the cooling component 2 includes both the copper wire and the braided net, and the arrangement of the copper wire and the braided net are implemented according to the above-mentioned scheme. , the copper wire and the braided mesh are all connected to the heat conducting plate 3, and this scheme can further accelerate the cooling speed. Of course, in order to save costs, those skilled in the art can choose the solution of only providing copper wires or only woven mesh, as long as the desired cooling effect can be achieved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. A guide catheter, characterized in that it comprises a catheter body (1), a cooling component (2), a heat conduction plate (3) and a semiconductor refrigeration sheet (4); The cooling component (2) is arranged in the conduit body (1) and extends along the length direction of the conduit body (1), and one end of the cooling component (2) is connected to the heat conducting plate (3) , the heat conduction plate (3) is attached to the semiconductor cooling sheet (4), and a wire (5) for connecting a power supply is arranged on the cooling sheet (4). 2. The guiding catheter according to claim 1, characterized in that, the cooling component (2) includes copper wires, the copper wires are arranged in the inner channel of the catheter body (1) and run along the catheter body (1). The body (1) extends in the length direction, and one end of the copper wire is connected to the heat conducting plate (3). 3. The guiding catheter according to claim 2, wherein the copper wire is helical. 4. The guiding catheter according to claim 2, wherein a layer of biologically inert film is formed on the outer surface of the copper wire. 5. The guide catheter according to claim 2, characterized in that, one end of the copper wire is fixed on the inner wall of the catheter body (1), and the other end passes through the inner wall of the catheter body (1) and the inner wall of the catheter body (1). The heat conducting plate (3) is connected. 6. The guiding catheter according to claim 5, characterized in that, the end of the heat conducting plate (3) connected to the copper wire is in the shape of a sharp knife. 7. The guide catheter according to claim 1, characterized in that, the cooling component (2) comprises a braided mesh extending along the length direction of the catheter body (1), and one end of the braided mesh Connect with the heat conducting plate (3). 8. The guiding catheter according to claim 7, wherein the braided mesh is copper braided mesh. 9. The guiding catheter according to claim 7, characterized in that, the tube wall of the catheter body (1) comprises an outer tube wall (11) and an inner tube wall (12), and the braided mesh is sandwiched between the Between the outer pipe wall (11) and the inner pipe wall (12). 10. The guiding catheter according to claim 9, characterized in that, the outer tube wall (11) is coated with polyethylene, and the inner tube wall (12) is coated with nylon polytetrafluoroethylene.