Temperature-controllable injection catheter and system

Abstract

The utility model 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] This utility model relates to the field of medical device technology, specifically to a temperature-controlled injection catheter and system. Background Technology

[0002] An interventional catheter is a medical device used in minimally invasive interventional procedures, typically made of polymer materials or a metal braided layer. It is inserted into the body through natural cavities (such as blood vessels, the digestive tract, and the urinary system) or tiny incisions for the diagnosis or treatment of diseases. Guided by medical imaging equipment, the catheter is precisely positioned at the target site to perform procedures such as angiography, dilation of narrowed blood vessels, and delivery of instruments or drugs.

[0003] For example, a central venous catheter is an intravascular catheter placed in a large vein to measure central venous pressure and administer long-term parenteral nutrition and medication. It establishes a reliable infusion route for patients requiring repeated infusions, avoiding the pain of repeated punctures. During infusion, the cold medication can easily cause chills and other discomfort in patients, increasing patient suffering and reducing nurses' efficiency; in severe cases, it may lead to medical accidents. CN209596369U uses a heating wire spirally wound within a gel body between the inner and outer walls of the inner and outer tubing, forming a circuit with the power module. When heating is needed, the power can be activated by a switch, ensuring a suitable temperature for the medication within the lumen while preventing breakage and deformation. It also allows for real-time monitoring of the medication temperature within the catheter, reducing patient discomfort. However, this technology only provides heating; it cannot cool the catheter.

[0004] In recent years, thermosensitive hydrogels have been extensively studied as carriers for targeted drug release. When a sol-liquid hydrogel reaches body temperature (around 37°C), it undergoes a phase transition to a gel state. Therefore, during injection and delivery, the temperature must be kept below body temperature to prevent premature gelation and blockage of the delivery channel. Some drug solutions also require low-temperature storage; if they reach body temperature during delivery, they may exert their effects prematurely, leading to decreased activity. In these cases, cooling treatment of the liquid during delivery is necessary. Utility Model Content

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

[0006] To achieve the above objectives, this utility model provides the following technical solution: a temperature-controlled 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.

[0007] The guide rod is a three-lumen tube extruded from polymer material, including a middle guidewire lumen and two circulating water cavities at both ends. Several through holes are opened between the two circulating water cavities at the tail end of the guide rod. The distal catheter is a single-lumen tube extruded from polymer material, which communicates with the guidewire lumen. The guide rod is fixedly connected to the distal catheter. The ends of circulating water cavities A and B are sealed, and the other ends serve as the circulating water inlet and circulating water outlet, respectively.

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

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

[0010] Preferably, the guidewire cavity also serves as a liquid injection cavity, with an inner diameter of 0.25–1.0 mm.

[0011] Preferably, the distal end of the 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 is welded to the distal catheter.

[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-controlled injection catheter includes a temperature-controlled circulating water tank, the two ports of which are respectively connected to a circulating water inlet and a circulating water outlet.

[0016] Preferably, the temperature-controlled circulating water tank has both cooling and heating functions, with a temperature control range of 10–50°C.

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

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] By controlling the water temperature and flow rate in the circulation channel to heat the injection chamber, the risk of electric leakage caused by direct electric heating is avoided, thus achieving the goal of safe temperature-controlled injection.

[0020] By using a temperature-controlled circulating water tank to provide circulating water below room temperature, the liquid in the injection chamber can be cooled, ensuring that drugs requiring low-temperature preservation do not become ineffective or deactivated due to body temperature before reaching the target lesion site. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of this utility model;

[0022] Figure 2 The present invention provides a schematic diagram of the transverse and longitudinal cross-sections at position A, where a is a schematic diagram of the transverse cross-section at position A, b is a schematic diagram of the longitudinal cross-section of the through hole at position A, and c is a schematic diagram of the longitudinal cross-section of the circulating water cavity at position A.

[0023] Figure 3 The present invention provides a schematic diagram of the transverse and longitudinal sections at position B, where a is a schematic diagram of the transverse section at position B and b is a schematic diagram of the longitudinal section at position B.

[0024] In the diagram: 1. Guidewire seat; 2. Circulating water inlet; 3. Circulating water outlet; 4. Guide rod; 5. Distal guide tube; 6. Guidewire cavity; 7. Circulating water cavity A; 8. Circulating water cavity B; 9. Through hole. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that when one component is referred to as "connecting" another component, it can be a direct connection to the other component or an indirect connection through an intervening component.

[0027] Furthermore, it should be understood that, for ease of description, the dimensions of the various components shown in the accompanying drawings are not drawn to actual scale; for example, the thickness or width of some layers may be exaggerated relative to other layers.

[0028] Example 1

[0029] like Figure 1As shown, a temperature-controlled injection catheter and system includes a catheter rod 4, a distal catheter 5, a guidewire seat 1, a guidewire cavity 6, a circulating water channel, and a temperature-controlled circulating water tank. The circulating water channel of the catheter consists 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-lumen tube extruded from polyamide, including a guidewire cavity 6 and two arc-shaped circulating water cavities. A 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-lumen tube extruded from polyamide, with the same inner diameter as the guidewire 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 shut. The guidewire cavity 6 also serves as the injection chamber for the liquid, with an inner diameter of 0.40 mm, allowing a 0.014-inch guidewire to pass through. The outer diameter of the catheter rod 4 is 1.2 mm, the total length of the catheter is 1000 mm, and the length of the distal catheter 5 is 30 mm. The end of the distal catheter 5 is shaped into a J-shape. The circulating water inlet 2 and circulating water outlet 3 are connected to the outlet and inlet of the temperature-controlled circulating water tank, respectively. The tank temperature is controlled at 38℃, and the circulating water flow rate is controlled at 200mL / min. Liquid at room temperature of 25℃ is injected from the guidewire seat 1, and the temperature of the liquid flowing out from the distal end of the conduit 5 is heated to about 36℃.

[0030] Example 2

[0031] like Figure 1 As shown, a temperature-controlled injection catheter and system includes a catheter rod 4, a distal catheter 5, a guidewire seat 1, a guidewire cavity 6, a circulating water channel, and a temperature-controlled circulating water tank. The circulating water channel of the catheter consists of a circulating water inlet 2, a circulating water outlet 3, a circulating water cavity, and through holes 9. The catheter rod 4 is a three-lumen tube extruded from polytetrafluoroethylene (PTFE), including the guidewire 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-lumen tube extruded from PTFE, with the same inner diameter as the guidewire 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 shut. The guidewire cavity 6 also serves as the injection chamber for the liquid, with an inner diameter of 0.50 mm, allowing a 0.018-inch guidewire to pass through. The outer diameter of the catheter rod 4 is 1.8 mm, the total length of the catheter is 500 mm, and the distal catheter 5 is 40 mm long with a straight end. The circulating water inlet 2 and circulating water outlet 3 are connected to the outlet and inlet of the temperature-controlled circulating water tank, respectively. The tank temperature is controlled at 10℃, and the circulating water flow rate is controlled at 1000mL / min. Liquid at room temperature of 25℃ is injected from the guide wire seat 1, and the liquid flowing out from the end of the distal conduit 5 is cooled to about 16℃.

[0032] Example 3

[0033] like Figure 1As shown, a temperature-controlled injection catheter and system includes a catheter rod 4, a distal catheter 5, a guidewire seat 1, a guidewire cavity 6, a circulating water channel, and a temperature-controlled circulating water tank. The circulating water channel of the catheter consists of a circulating water inlet 2, a circulating water outlet 3, a circulating water chamber, and through holes 9. The catheter rod 4 is a three-lumen tube extruded from polyethylene, including the guidewire cavity 6 and two arc-shaped circulating water chambers. Three through holes 9 are opened between the two arc-shaped circulating water chambers at the tail end of the catheter rod 4. The distal catheter 5 is a single-lumen tube extruded from polyetheramide elastomer, with the same inner diameter as the guidewire 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 chamber is welded shut. The guidewire cavity 6 also serves as the injection chamber for the liquid, with an inner diameter of 0.90 mm, allowing a 0.035-inch guidewire to pass through. The outer diameter of the catheter rod 4 is 2.1 mm, the total length of the catheter is 1400 mm, and the distal catheter 5 is 100 mm long with a straight end. The circulating water inlet 2 and circulating water outlet 3 are connected to the outlet and inlet of the temperature-controlled circulating water tank, respectively. The tank temperature is controlled at 10℃, and the circulating water flow rate is controlled at 600mL / min. Liquid at room temperature of 25℃ is injected from the guidewire seat 1, and the liquid flowing out from the end of the distal conduit 5 is cooled to about 20℃.

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

Claims

1. A temperature-controlled injection catheter, comprising a catheter rod, a distal catheter, a guidewire seat, a guidewire lumen, and a circulating water channel. The circulating water channel of the catheter consists of a circulating water inlet, a circulating water outlet, a circulating water cavity, and through holes. The catheter rod is a three-lumen tube extruded from a polymer material, including a middle guidewire lumen and two circulating water cavities at both ends. Several through holes are 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 and communicates with the guidewire lumen. The catheter rod is fixedly connected to the distal catheter. The ends of circulating water cavities A and B are sealed, and the other ends serve as the circulating water inlet and circulating water outlet, respectively.

2. The temperature-controlled 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.

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

4. The temperature-controlled injection catheter according to claim 1, characterized in that: The guidewire cavity also serves as a liquid injection cavity, with an inner diameter of 0.25–1.0 mm.

5. The temperature-controlled injection catheter according to claim 1, characterized in that: The polymeric materials include polyamide, polyethylene, polytetrafluoroethylene, and polyetheramide elastomer.

6. The temperature-controlled injection catheter according to claim 1, characterized in that: The total length of the catheter is 300–1400 mm.

7. The temperature-controlled injection catheter according to claim 1, characterized in that: The distal end of the catheter is straight or shaped into a J-shape.

8. The temperature-controlled injection catheter according to claim 1, characterized in that: The distal catheter length is 30–100 mm.

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

10. A system with a temperature-controlled injection catheter, characterized in that: It includes a temperature-controlled circulating water tank, with two interfaces connected to the circulating water inlet and the circulating water outlet, respectively.

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