CN218943500U

CN218943500U - Microwave ablation needle

Info

Publication number: CN218943500U
Application number: CN202223475450.5U
Authority: CN
Inventors: 胡祥豹; 丁莉
Original assignee: Canyon Medical Inc
Current assignee: Canyon Medical Inc
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-05-02
Anticipated expiration: 2032-12-26

Abstract

The utility model relates to a microwave ablation needle, which comprises a handle, an outer needle tube and a needle head, wherein a coaxial cable is arranged in the outer needle tube, a capillary tube is sleeved outside the coaxial cable, the capillary tube comprises a metal capillary tube and a nonmetal capillary tube, the metal capillary tube and the nonmetal capillary tube are fixed through bonding, a water inlet channel is formed between the capillary tube and the coaxial cable, and a water outlet channel is formed between the capillary tube and the outer needle tube; the outer side of the coaxial cable is stuck with a metal arc patch which is abutted against the coaxial cable, and the metal arc patch and the metal capillary tube are connected and fixed together through a metal heat conduction piece. According to the coaxial cable cooling device, the metal arc patch is added in the metal capillary tube, so that the heat exchange area of the metal capillary tube is increased, the heat on the surface of the coaxial cable can be rapidly transferred to the surface of the whole metal capillary tube, and the cooling speed of the coaxial cable is greatly improved.

Description

Microwave ablation needle

Technical Field

The utility model relates to a microwave ablation needle, and belongs to the technical field of medical appliances.

Background

The microwave ablation technology is widely applied to the field of clinical treatment of soft tissue solid tumors, has the advantages of simplicity, safety, short operation time and the like, can reduce the risk in operation and the pain of patients, and has controllable solidification volume. The microwave tumor ablation is to utilize microwave energy to act on tissue to generate heat effect, and in short time, the central temperature of the heat field can reach over 100 ℃, and the tumor tissue is coagulated and deactivated at instant high temperature, so as to achieve the purpose of tumor ablation treatment. Microwave tumor ablation is to insert a microwave ablation needle into a focus of human tissue, and continuously emit microwave energy from the front end of the microwave ablation needle to perform operation.

Common microwave ablation needles generally include a handle, a needle tip, an outer needle tube, a coaxial cable, a radiator, and a cooling fluid tube, see chinese patent publication No. CN113576659a (publication No. 2021, 11, 02). In the using process of the microwave ablation needle, the coaxial cable and the outer needle tube are required to be cooled by cooling circulating water, and according to the knowledge of the applicant, a capillary tube is sleeved outside the coaxial cable, extends to the ablation antenna, a gap is formed between the capillary tube and the coaxial cable and is used as a water inlet channel, a gap is formed between the capillary tube and the outer needle tube and is used as a water outlet channel, and the cooling circulating water flows in from the water inlet channel and flows out from the water outlet channel, so that the circulating cooling of the outer needle tube and the coaxial cable is completed.

The cooling mode is commonly applied to microwave ablation needles, but still has the defects: the main part of the capillary is generally a metal tube, but because the capillary extends to the ablation antenna, in order to ensure the ablation effect on the microwave ablation needle and prevent the capillary from shielding the antenna, the capillary is generally divided into two parts, the capillary at the outer needle tube part is a metal tube, the capillary at the needle head part is a nonmetallic capillary (preferably a plastic capillary), and the metal capillary and the nonmetallic capillary are fixed by bonding; the microwave ablation requires a large amount of heat to be transferred through the cooling fluid, but no matter the capillary tube or the outer needle tube is thin, the contact area between the inner surface of the outer needle tube and the surface of the coaxial cable and the cooling fluid is small, and the heat exchange speed between the cooling fluid and the inner surface of the needle tube and the surface of the coaxial cable is not particularly high when the cooling fluid passes through the fluid channel, so that a larger cooling fluid flow is required to obtain more efficient heat exchange capacity, and the bonding part between the metal capillary tube and the nonmetal capillary tube is possibly damaged due to the increase of the flow, so that the nonmetal capillary tube falls off from the metal capillary tube, and unnecessary medical accidents are caused.

Therefore, how to improve the cooling efficiency of the ablation needle on the premise of ensuring the bonding and fixing of the metal capillary and the nonmetal capillary becomes a problem to be solved urgently.

Disclosure of Invention

The utility model aims to solve the technical problems that: a microwave ablation needle is provided which can reduce the occurrence of medical accidents by improving the cooling efficiency of the ablation needle.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows: the microwave ablation needle comprises a handle, an outer needle tube and a needle head, wherein a coaxial cable is arranged in the outer needle tube, a capillary tube is sleeved outside the coaxial cable, the capillary tube comprises a metal capillary tube and a nonmetal capillary tube, the metal capillary tube and the nonmetal capillary tube are fixed through bonding, a water inlet channel is formed between the capillary tube and the coaxial cable, and a water outlet channel is formed between the capillary tube and the outer needle tube; the outer side of the coaxial cable is stuck with a metal arc patch which is abutted against the coaxial cable, and the metal arc patch and the metal capillary tube are connected and fixed together through a metal heat conduction piece.

According to the utility model, the metal arc patch is added in the metal capillary, so that the heat exchange area of the metal capillary is increased, the heat exchange efficiency of the cooling fluid and the metal capillary is improved, and the cooling efficiency of the metal capillary is higher. In addition, the metal arc patch is attached to the surface of the coaxial cable, and the heat on the surface of the coaxial cable can be quickly transferred to the arc patch and then to the surface of the whole metal capillary, so that the metal capillary can be secondarily cooled by the cooling fluid of the metal outer needle tube, which is equivalent to greatly increasing the heat conduction area of the cooling fluid and the coaxial cable, so that the cooling speed of the coaxial cable can be greatly improved, when the higher efficient heat exchange capacity is required, the requirements on the flow and the flow speed of the cooling fluid are reduced, the probability of damaging the bonding part between the metal capillary and the nonmetal capillary and causing the nonmetal capillary to drop from the metal capillary is reduced, and the occurrence of medical accidents is reduced.

Drawings

The utility model is further described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a first embodiment of the present utility model.

Fig. 2 is a schematic view of the internal structure of the needle and outer cannula of fig. 1.

Fig. 3 is a schematic view of the metallic arcuate patch of fig. 1.

Fig. 4 is a schematic structural diagram of a second embodiment of the present utility model.

Fig. 5 is a schematic cross-sectional view of an outer needle tube in embodiment two.

Reference numerals: 1. a handle; 2. an outer needle tube; 3. a needle; 4. an antenna; 5. a coaxial cable; 6. a water inlet channel; 7. a water outlet channel; 8. a metal capillary; 9. a non-metallic capillary tube; 10. a metal arc patch; 11. a groove; 12. a metal heat conducting member.

Detailed Description

Example 1

The embodiment relates to a microwave ablation needle, as shown in fig. 1-3, the microwave ablation needle comprises a handle 1, an outer needle tube 2 and a needle head 3, wherein a coaxial cable 5 is arranged inside the outer needle tube 2, a capillary tube is sleeved outside the coaxial cable 5, the capillary tube comprises a metal capillary tube 8 and a nonmetal capillary tube 9, the metal capillary tube 8 and the nonmetal capillary tube 9 are fixed through bonding, a water inlet channel 6 is formed between the capillary tube and the coaxial cable 5, a water outlet channel 7 is formed between the capillary tube and the outer needle tube 2, a water tank, a water inlet, a water outlet and the like which are connected with the water tank are also arranged on the handle 1, and the microwave ablation needle can refer to related documents and is not repeated.

As shown in fig. 2 and 3, a metal arc patch 10 abutted against the coaxial cable 5 is attached to the outer side of the coaxial cable 5, the metal arc patch 10 and the metal capillary 8 are connected and fixed together through a metal heat conducting member 12, and the metal arc patch 10, the metal heat conducting member 12 and the metal capillary 8 are preferably integrally manufactured. The specific shape and position of the metal arc patch 10 in this embodiment are not limited, and for example, the metal arc patch may be equal to the outer needle tube 2, or may be a sectional type, so long as the heat on the surface of the coaxial cable 5 can be transferred to the arc patch and then to the surface of the whole metal capillary tube 8. Preferably, the metal arc patch 10 has a plurality of patches, which are distributed at intervals along the circumference of the coaxial cable 5; however, in order to ensure the flow rate of the cooling liquid, the following two embodiments are preferably adopted in this example: as shown in fig. 2 and 3, the metal arc-shaped patches 10 extend along the axial direction of the coaxial cable 5, or the metal arc-shaped patches 10 are spirally arranged along the axial direction of the coaxial cable 5 (not shown in the drawings), so that the flow rate of the cooling liquid can be ensured, and the heat exchange area can be increased.

Example two

This embodiment is a further improvement on the basis of the first embodiment, and differs from the first embodiment in that: as shown in fig. 4 and 5, the inner wall of the outer needle tube 2 is provided with a groove 11. The groove 11 is arranged on the inner wall of the metal outer needle tube 2, so that the inner surface area of the metal outer needle tube 2 can be increased, the heat exchange efficiency of cooling fluid and the metal outer needle tube 2 can be improved, and the cooling efficiency of the metal inner needle tube can be improved.

In this embodiment, the shape and the distribution of the grooves 11 are not limited, and the requirement can be satisfied as long as the heat exchange area of the metal outer needle tube 2 can be increased. Preferably, the grooves 11 are provided in a plurality of numbers and are spaced apart from each other in the circumferential direction of the outer needle tube 2. However, in order to ensure the flow rate of the cooling liquid, the following two embodiments are preferred: 1) The grooves 11 extend in the axial direction of the outer needle tube 2, and 2) the grooves 11 are each spirally provided in the axial direction of the outer needle tube 2.

It should be noted that, the end of the metal outer needle tube 2 near the needle 3 is preferably reserved with a smooth inner wall, and no groove 11 is provided, so that the metal outer needle tube 2 and the needle 3 are adhered and fixed.

Claims

1. The microwave ablation needle comprises a handle, an outer needle tube and a needle head, wherein a coaxial cable is arranged in the outer needle tube, a capillary tube is sleeved outside the coaxial cable, the capillary tube comprises a metal capillary tube and a nonmetal capillary tube, the metal capillary tube and the nonmetal capillary tube are fixed through bonding, a water inlet channel is formed between the capillary tube and the coaxial cable, and a water outlet channel is formed between the capillary tube and the outer needle tube; the method is characterized in that: the outer side of the coaxial cable is stuck with a metal arc patch which is abutted against the coaxial cable, and the metal arc patch and the metal capillary tube are connected and fixed together through a metal heat conduction piece.

2. The microwave ablation needle according to claim 1, wherein: the metal arc patch, the metal heat conducting piece and the metal capillary tube are integrally manufactured.

3. The microwave ablation needle according to claim 1, wherein: the metal arc-shaped patches are provided with a plurality of pieces and are distributed at intervals along the circumferential direction of the coaxial cable, and any piece of metal arc-shaped patches extend along the axial direction of the coaxial cable.

4. The microwave ablation needle according to claim 1, wherein: the metal arc-shaped patches are provided with a plurality of pieces and are distributed at intervals along the circumference of the coaxial cable, and any piece of metal arc-shaped patches are spirally arranged along the axis direction of the coaxial cable.

5. The microwave ablation needle according to any of claims 1-4, wherein: and grooves are formed in the inner wall of the outer needle tube.

6. The microwave ablation needle according to claim 5, wherein: the grooves are distributed at intervals along the circumferential direction of the outer needle tube, and any groove extends along the axial direction of the outer needle tube.

7. The microwave ablation needle according to claim 5, wherein: the grooves are distributed at intervals along the circumferential direction of the outer needle tube, and any groove is spirally arranged along the axial direction of the outer needle tube.