Temperature-controllable injection catheter and system

Abstract

The invention relates to a temperature-controllable injection catheter and system, and belongs to the technical field of medical instruments. Comprising a catheter rod, a far-end catheter, a guide wire seat, a guide wire cavity, a circulating water channel and a temperature control circulating water tank, the circulating water channel of the catheter is composed of a circulating water inlet, a circulating water outlet, a circulating water cavity channel and a through hole, and the guide wire cavity serves as a liquid injection cavity at the same time. Hot water or cold water is supplied into the guide pipe through the circulating water channel and the system so as to heat or cool liquid in the injection cavity, and the purpose of temperature control injection is achieved. Through refrigeration of the temperature control circulating water tank, circulating water with the temperature lower than the room temperature is provided, the effect of cooling liquid in the injection cavity is achieved, and it can be achieved that liquid medicine needing to be stored at the low temperature does not lose efficacy or inactivate due to the body temperature before reaching a target lesion site.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a temperature-controlled injection catheter and system. Background Art

[0002] An interventional catheter is a medical device used in minimally invasive interventional surgeries, usually made of polymer materials or metal braided layers. It enters the body through natural body cavities (such as blood vessels, digestive tract, urinary system, etc.) or small incisions for disease diagnosis or treatment. The catheter is precisely positioned at the target site under the guidance of medical imaging equipment to perform operations such as angiography, dilating stenosed blood vessels, delivering instruments or drugs.

[0003] For example, a central venous catheter is an intravascular tube placed in a large vein, used for measuring central venous pressure and the administration of long-term parenteral nutrition and drug injection, establishing a good infusion channel for patients with repeated infusions, and avoiding the pain of repeated punctures. During the infusion process, due to the coldness of the drug solution, it is easy for patients to have discomfort such as shivering and coldness, increasing the pain of patients and reducing the work efficiency of nurses. In severe cases, it may cause medical accidents. CN209596369U uses an electric heating wire to be spirally wound in the colloid between the inner wall and the outer wall of the inner catheter body and the outer catheter body to form an electrical circuit loop with the power supply module; when heating is required, the power supply can be started through a switch, while preventing breakage and deformation, ensuring that the temperature of the drug solution in the lumen is appropriate, and at the same time, the temperature of the drug solution in the catheter can be monitored in real time, reducing the pain of patients. However, this technical solution can only achieve the heating function and cannot cool down.

[0004] In recent years, there has been much research on thermosensitive hydrogels as carriers for targeted drug release. When the sol-state hydrogel reaches about 37°C of body temperature, it phase-transforms into a gel state. Therefore, during the injection and delivery process, the temperature should be lower than the body temperature to avoid premature transformation into a gel and blocking the pipeline. There are also some drug solutions that need to be stored at low temperatures. If they reach the body temperature during the delivery process, they are likely to exert their effects prematurely and cause a decrease in activity. The above situations require cooling treatment of the liquid during the delivery process. Summary of the Invention

[0005] The purpose of the present invention is to provide a temperature-controlled injection catheter and system to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A temperature-controlled injection catheter includes a catheter rod, a distal catheter, a guide wire seat, a guide wire cavity, and a circulating water channel. The circulating water channel of the catheter is composed of a circulating water inlet, a circulating water outlet, a circulating water cavity, and a through hole.

[0007] The catheter rod is a three - lumen tube extruded from a polymer material, including a middle guide wire lumen and two circulating water channels at both ends. A number of through - holes are opened between the two circulating water channels at the tail end of the catheter rod; the distal catheter is a single - lumen tube extruded from a polymer material and is communicated with the guide wire lumen. The catheter rod and the distal catheter are fixedly connected. The ends of the circulating water channel A and the circulating water channel B are blocked, and the other ends are used as the circulating water inlet and the circulating water outlet respectively.

[0008] Preferably, the inner diameter of the distal catheter is the same as that of the guide wire lumen.

[0009] Preferably, the circulating water channel A and the circulating water channel B are arc - shaped.

[0010] Preferably, the guide wire lumen also serves as the injection lumen for liquid, and its inner diameter is 0.25 - 1.0 mm.

[0011] Preferably, the end of the distal catheter is straight or shaped into a J - shape.

[0012] Preferably, the polymer material extrusion includes polyamide, polyethylene, polytetrafluoroethylene, polyetheramide elastomer, etc.

[0013] Preferably, the catheter rod and the distal catheter are welded.

[0014] Preferably, the total length of the catheter is 300 - 1400 mm, and the length of the distal catheter is 30 - 100 mm.

[0015] A system with a temperature - controllable injection catheter includes a temperature - controlled circulating water tank. Two interfaces of the temperature - controlled circulating water tank are respectively connected to the circulating water inlet and the circulating water outlet.

[0016] Preferably, the temperature - controlled circulating water tank has both refrigeration and heating functions, and the temperature control range is 10 - 50 °C.

[0017] Preferably, the circulating water flow rate of the temperature - controlled circulating water tank is controllable, and the range is 10 - 1000 mL / min.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] By controlling the water temperature and flow rate of the circulation channel to heat the liquid medicine in the injection lumen, the risk of electric leakage caused by direct electric heating is avoided, and the purpose of safe temperature - controlled injection is achieved.

[0020] By refrigerating the temperature - controlled circulating water tank, circulating water with a temperature lower than room temperature is provided to cool the liquid in the injection lumen, so that the liquid medicine that needs to be stored at a low temperature will not become ineffective or inactivated due to body temperature before reaching the target lesion site. Brief Description of the Drawings

[0021] Figure 1 Structural schematic diagram of the present invention;

[0022] Figure 2 Schematic diagrams of the transverse and longitudinal sections at position A of the present invention. Diagram a is the schematic diagram of the transverse section at position A, diagram b is the schematic diagram of the longitudinal section of the through-hole at position A, and diagram c is the schematic diagram of the longitudinal section of the circulating water channel at position A;

[0023] Figure 3 Schematic diagrams of the transverse and longitudinal sections at position B of the present invention. Diagram a is the schematic diagram of the transverse section at position B, and diagram b is the schematic diagram of the longitudinal section at position B;

[0024] In the figures: 1, guide wire seat; 2, circulating water inlet; 3, circulating water outlet; 4, catheter rod; 5, distal catheter; 6, guide wire cavity; 7, circulating water channel A; 8, circulating water channel B; 9, through-hole. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] It should be noted that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected through an intermediate element.

[0027] In addition, it should be understood that for the sake of description, the dimensions of the various components shown in the drawings are not drawn in actual proportional relationships. For example, the thickness or width of some layers can be exaggerated relative to other layers.

[0028] Embodiment 1

[0029] As Figure 1As shown in the figure, a temperature-controlled injection catheter and system include a catheter rod 4, a distal catheter 5, a guide wire seat 1, a guide wire cavity 6, a circulating water channel, and a temperature-controlled circulating water tank. The circulating water channel of the catheter is composed of a circulating water inlet 2, a circulating water outlet 3, a circulating water cavity, and a through hole 9. The catheter rod 4 is a three-chamber tube extruded from polyamide, including a guide wire cavity 6 and two arc-shaped circulating water cavities. One through hole 9 is opened between the two arc-shaped circulating water cavities at the tail end of the catheter rod 4; the distal catheter 5 is a single-chamber tube extruded from polyamide, with an inner diameter the same as that of the guide wire cavity 6 of the catheter rod 4. The catheter rod 4 and the distal catheter 5 are welded together by heating or CO2 laser welding, and the end of the circulating water cavity is welded and sealed. The guide wire cavity 6 also serves as a liquid injection cavity, with an inner diameter of 0.40 mm, and can pass a 0.014-inch guide wire. The outer diameter of the catheter rod 4 is 1.2 mm, the total length of the catheter is 1000 mm, the length of the distal catheter 5 is 30 mm, and the end of the distal catheter 5 is shaped into a J shape. The circulating water inlet 2 and the circulating water outlet 3 are respectively connected to the water outlet and the water inlet of the temperature-controlled circulating water tank. The temperature of the water tank is controlled at 38°C, and the circulating water flow rate is controlled at 200 mL / min. Liquid at room temperature of 25°C is injected from the guide wire seat 1, and the temperature of the liquid flowing out from the end of the distal catheter 5 is heated to about 36°C.

[0030] Example 2

[0031] As Figure 1 shown in the figure, a temperature-controlled injection catheter and system include a catheter rod 4, a distal catheter 5, a guide wire seat 1, a guide wire cavity 6, a circulating water channel, and a temperature-controlled circulating water tank. The circulating water channel of the catheter is composed of a circulating water inlet 2, a circulating water outlet 3, a circulating water cavity, and a through hole 9. The catheter rod 4 is a three-chamber tube extruded from polytetrafluoroethylene, including a guide wire cavity 6 and two arc-shaped circulating water cavities. Three through holes 9 are opened between the two arc-shaped circulating water cavities at the tail end of the catheter rod 4; the distal catheter 5 is a single-chamber tube extruded from polytetrafluoroethylene, with an inner diameter the same as that of the guide wire cavity 6 of the catheter rod 4. The catheter rod 4 and the distal catheter 5 are welded together by heating or CO2 laser welding, and the end of the circulating water cavity is welded and sealed. The guide wire cavity 6 also serves as a liquid injection cavity, with an inner diameter of 0.50 mm, and can pass a 0.018-inch guide wire. The outer diameter of the catheter rod 4 is 1.8 mm, the total length of the catheter is 500 mm, the length of the distal catheter 5 is 40 mm, and the end of the distal catheter 5 is straight. The circulating water inlet 2 and the circulating water outlet 3 are respectively connected to the water outlet and the water inlet of the temperature-controlled circulating water tank. The temperature of the water tank is controlled at 10°C, and the circulating water flow rate is controlled at 1000 mL / min. Liquid at room temperature of 25°C is injected from the guide wire seat 1, and the temperature of the liquid flowing out from the end of the distal catheter 5 is cooled to about 16°C.

[0032] Example 3

[0033] As Figure 1As shown, a temperature-controlled injection catheter and system include a catheter shaft 4, a distal catheter 5, a guide wire seat 1, a guide wire lumen 6, a circulating water channel, and a temperature-controlled circulating water tank. The circulating water channel of the catheter is composed of a circulating water inlet 2, a circulating water outlet 3, a circulating water cavity, and a through hole 9. The catheter shaft 4 is a three-lumen tube extruded from polyethylene, including a guide wire lumen 6 and two arc-shaped circulating water cavities. Three through holes 9 are opened between the two arc-shaped circulating water cavities at the tail end of the catheter shaft 4. The distal catheter 5 is a single-lumen tube extruded from polyetheramide elastomer, with an inner diameter the same as that of the guide wire lumen 6 of the catheter shaft 4. The catheter shaft 4 and the distal catheter 5 are welded together by heating or CO2 laser welding, and the end of the circulating water cavity is welded and sealed. The guide wire lumen 6 also serves as a liquid injection cavity, with an inner diameter of 0.90 mm, and can pass a 0.035-inch guide wire. The outer diameter of the catheter shaft 4 is 2.1 mm, the total length of the catheter is 1400 mm, the length of the distal catheter 5 is 100 mm, and the end of the distal catheter 5 is straight. The circulating water inlet 2 and the circulating water outlet 3 are respectively connected to the water outlet and the water inlet of the temperature-controlled circulating water tank. The temperature of the water tank is controlled at 10°C, and the circulating water flow rate is controlled at 600 mL / min. A liquid at room temperature of 25°C is injected from the guide wire seat 1, and the temperature of the liquid flowing out of the end of the distal catheter 5 is cooled to about 20°C.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A temperature-controllable injection catheter, comprising a catheter rod, a distal catheter, a guidewire seat, a guidewire cavity, and a circulating water channel, wherein the circulating water channel of the catheter is composed of a circulating water inlet, a circulating water outlet, a circulating water cavity and a through hole, wherein the catheter rod is a three-lumen tube extruded from a polymer material, comprising a middle guidewire cavity and two circulating water cavities at both ends, and a plurality of through holes are respectively opened between the two circulating water cavities at the tail end of the catheter rod; the distal catheter is a single-lumen tube extruded from a polymer material, which is communicated with the guidewire cavity, the catheter rod is fixedly connected to the distal catheter, the ends of the circulating water cavity A and the circulating water cavity B are blocked, and the other ends serve as the circulating water inlet and the circulating water outlet, respectively.

2. The temperature-controllable injection catheter according to claim 1, characterized in that: The inner diameter of the distal catheter is the same as that of the guidewire lumen, and the distal end of the distal catheter is straight or shaped into a J shape.

3. The temperature-controllable injection catheter according to claim 1, characterized in that: The circulating water cavity A and the circulating water cavity B are arc-shaped.

4. The temperature-controllable injection catheter according to claim 1, characterized in that: The guide wire cavity also serves as a liquid injection cavity, and has an inner diameter of 0.25 to 1.0 mm.

5. The temperature-controllable injection catheter according to claim 1, characterized in that: The polymer material includes polyamide, polyethylene, polytetrafluoroethylene, and polyetheramide elastomer.

6. The temperature-controllable injection catheter according to claim 1, characterized in that: The total length of the catheter is 300-1400 mm, and the length of the distal catheter is 30-100 mm.

7. The temperature-controllable injection catheter according to claim 1, characterized in that: The catheter rod is welded to the distal catheter.

8. A system with a temperature-controllable injection catheter, characterized in that: It comprises a temperature-controlled circulating water tank, and two interfaces of the temperature-controlled circulating water tank are respectively connected with a circulating water inlet and a circulating water outlet.

9. The system with a temperature-controllable injection catheter according to claim 8, characterized in that: The temperature-controlled circulating water tank has both cooling and heating functions, and the temperature control range is 10-50°C.

10. The system with a temperature-controllable injection catheter according to claim 8, characterized in that: The circulating water flow rate of the temperature-controlled circulating water tank is controllable within a range of 10 to 1000 mL / min.

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