CN218943499U

CN218943499U - Adjustable microwave ablation needle

Info

Publication number: CN218943499U
Application number: CN202223299272.5U
Authority: CN
Inventors: 张弟; 宋波; 魏玲; 张�成; 顾智超
Original assignee: Canyon Medical Inc
Current assignee: Canyon Medical Inc
Priority date: 2022-12-09
Filing date: 2022-12-09
Publication date: 2023-05-02
Anticipated expiration: 2032-12-09

Abstract

The utility model relates to an adjustable microwave ablation needle, and belongs to the technical field of medical appliances. The ablation needle comprises a needle head and a needle rod, wherein a coaxial cable is arranged in the needle rod; the needle head is detachably arranged on the mounting seat, the coaxial cable and the needle head are electrically connected through the mounting seat, the needle head, the needle rod and the mounting seat are all made of metal, the mounting seat and the needle rod are electrically isolated through the insulating sleeve, and the mounting seat, the needle rod and the insulating sleeve are fixed together. The utility model can avoid excessive ablation and reduce the risk of surgery.

Description

Adjustable microwave ablation needle

Technical Field

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

Background

The microwave ablation technology utilizes polar molecules (mainly water molecules) in the tissue to absorb microwave energy emitted by a microwave ablation needle and convert the microwave energy into heat energy, the central temperature of a thermal field can reach more than 100 ℃ in a shorter time, and tumor tissue is coagulated and inactivated at a high temperature in the moment, so that the purpose of tumor ablation treatment is achieved, and the microwave ablation technology is high in efficiency, small in wound, less in complications, controllable in action depth and range of the tissue, and suitable for the ablation operation of whole solid tumors.

Microwave tumor ablation is to insert a microwave ablation needle into a focus of human tissue, and continuously emit microwave energy by a radiation antenna at the front end of the microwave ablation needle so as to implement operation. However, the radiation antenna of the existing many microwave ablation needles is fixed in size, the length of the radiation area cannot be adjusted along with the shape and size of the tumor, and the needle head cannot be customized according to whether the puncture effect exists at the position of the focus, so that normal tissues are possibly damaged due to the fact that the radiation antenna is larger than the tumor size when small tumors are ablated (the situation is also called excessive ablation), or the operation process is complicated due to the fact that the radiation antenna is smaller than the tumor size when large tumors are ablated, the ablation time is prolonged, and the operation risk is increased.

Disclosure of Invention

The utility model aims to solve the technical problems that: an adjustable microwave ablation needle capable of avoiding excessive ablation and reducing operation risks is provided.

In order to solve the technical problems, the technical scheme provided by the utility model is as follows: an adjustable microwave ablation needle comprises a needle head and a needle rod, wherein a coaxial cable is arranged in the needle rod; the needle head is detachably arranged on the mounting seat, the coaxial cable and the needle head are electrically connected through the mounting seat, the needle head, the needle rod and the mounting seat are all made of metal, the mounting seat and the needle rod are electrically isolated through the insulating sleeve, and the mounting seat, the needle rod and the insulating sleeve are fixed together.

According to the utility model, the needle is detachably arranged through the mounting seat, so that the needle can be replaced by different types and lengths (namely, the length and the type are adjustable), different needle types (shapes) can be selected according to the size and the shape of a tumor, different requirements on puncture force are met, blood vessels and nerves are protected, and great wounds on patients are effectively avoided; the needle head and the coaxial cable are connected to form the radiation antenna, so that the needle heads with different lengths can be selected, the radiation area of the antenna is adjusted, and then the needle head with proper size and shape with tumors is obtained, so that the risk of operation and the complexity of operation can be greatly reduced, the damage to normal tissues can be reduced, excessive ablation can be avoided, and the microwave treatment effect is improved.

Drawings

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

Fig. 1 is a schematic structural view of an embodiment of the present utility model.

Fig. 2 is a schematic view of the connection of the needle and the needle shaft.

Fig. 3 is a schematic view of a conical needle.

Fig. 4 is a schematic view of a triangular pyramid needle.

Fig. 5 is a schematic view of a round head needle.

Fig. 6 is a schematic view of a bevel tip.

Reference numerals: 1. a needle; 2. a needle bar; 3. a mounting base; 4. an insulating sleeve; 5. a water tank; 6. a microwave connector; 7. a water inlet pipe; 8. a water outlet pipe; 9. a coaxial cable.

Detailed Description

Examples

The embodiment relates to an adjustable microwave ablation needle, as shown in fig. 1 and 2, comprising a needle head 1 and a needle rod 2, wherein the needle head 1 is a microwave radiation window and is made of metal, such as stainless steel, copper and other metals; the needle bar 2 connects the needle 1 with a handle (not shown in the figure), and a coaxial cable 9 is arranged in the needle bar 2.

Typically the microwave ablation needle also has a radio frequency connector for providing an energy source for the microwave ablation needle, the radio frequency connector being connected to the coaxial cable 9; in addition, there is a cooling device comprising a water tank 5 and water inlet and

outlet pipes

7 and 8 arranged on the message for cooling the needle head 1 and the needle shaft 2 of the ablation needle. This is prior art and reference is made to the relevant literature.

The needle 1 is detachably arranged on the mounting seat 3, the coaxial cable 9 and the needle 1 are electrically connected through the mounting seat 3, so that the needle 1 becomes a radiation antenna, the lengths of the needles 1 are different, and the radiation areas are different. The needle head 1, the needle rod 2 and the mounting seat 3 are all made of metal, the mounting seat 3 and the needle rod 2 are electrically isolated through the insulating sleeve 4, and the mounting seat 3, the needle rod 2 and the insulating sleeve 4 are fixed together. The insulating sleeve 4 is used for isolating the needle head 1 from the needle rod 2, has an insulating effect, and is made of polymer materials or ceramics, such as PTFE, zirconia and the like, and the mounting seat 3, the needle rod 2 and the insulating sleeve 4 can be connected together through gluing. Preferably, to facilitate the handling of the device, the needle 1 and the mounting 3 are provided with grooves (as shown in figures 3-5).

As shown in fig. 2, the whole mounting seat 3 is in a circular shaft shape, one end of the mounting seat 3 is inserted into the needle bar 2, and the other end of the mounting seat 3 is connected with the needle head 1 through threads. Of course, the mounting base 3 and the needle 1 may also be connected by a common snap-fit connection.

In this embodiment, as shown in fig. 2, one end of the insulating sleeve 4 is inserted into the needle bar 2, the other end of the insulating sleeve 4 extends out of the needle bar 2, and the part of the insulating sleeve 4 extending out of the needle bar 2 extends radially outwards to form an annular boss and is abutted against the end of the needle bar 2; the middle part of mount pad 3 is equipped with the shaft shoulder, the shaft shoulder of mount pad 3 supports and leans on annular boss, and needle 1 and the junction of mount pad 3 also flush with the shaft shoulder.

Through the detachable connection, the length of the needle head 1 can have a plurality of preset specifications, and the antenna radiation area is adjusted by adjusting the length of the needle head 1, so that the proper needle head 1 is selected, the risk of operation and the complexity of operation are greatly reduced, the damage to good tissues, namely 'excessive ablation', is reduced, and the microwave treatment effect is improved; the needle 1 can be a conical needle (shown in figure 3), a triangular pyramid needle (shown in figure 4), a round head needle (shown in figure 5) or an oblique rib needle (shown in figure 6), meets different requirements on puncture force, protects blood vessels and nerves and effectively avoids great trauma to patients.

The working principle of this embodiment is as follows:

1) Pre-operation planning is performed according to the position of a focus and the shape and the size of the focus observed under CT or ultrasound;

2) The selection of the shape of the needle 1 according to the plan can be done empirically, several rules can be referenced as follows:

a. the focus has high requirements on puncture force in the envelope, and an oblique stupefied needle or a triangular pyramid needle can be selected;

b. the focus has general requirements on puncture force, and a conical needle can be selected;

c. the focus is near the blood vessel and nerve, and can not destroy the blood vessel nerve, and a round-head needle can be selected;

3) According to the shape and size of the focus, a needle head 1 with a proper length is selected, in the embodiment, the length of the needle head 1 is marked as three specifications, the lengths are 3cm, 7cm and 11cm in sequence, the longer the needle head 1 is, the larger the radiation length of an antenna is, the larger the microwave radiation area is, namely, the larger tumor ablation is suitable for a long needle head, and the smaller tumor ablation is suitable for a short needle head.

4) The needle 1 is assembled to the mounting base 3 after the type and length of the needle 1 are selected, and the assembling mode can be screw locking, buckle locking or other fixing modes.

5) And inserting the microwave ablation needle into the focus position to perform microwave ablation operation.

Claims

1. An adjustable microwave ablation needle comprises a needle head and a needle rod, wherein a coaxial cable is arranged in the needle rod; the method is characterized in that: the needle head is detachably arranged on the mounting seat, the coaxial cable and the needle head are electrically connected through the mounting seat, the needle head, the needle rod and the mounting seat are all made of metal, the mounting seat and the needle rod are electrically isolated through the insulating sleeve, and the mounting seat, the needle rod and the insulating sleeve are fixed together.

2. The adjustable microwave ablation needle according to claim 1, wherein: the whole circular shaft shape that is of mount pad, mount pad one end inserts in the needle bar, the other end of mount pad passes through threaded connection or buckle connection with the syringe needle.

3. The adjustable microwave ablation needle according to claim 2, wherein: one end of the insulating sleeve is inserted into the needle bar, the other end of the insulating sleeve extends out of the needle bar, and the part of the insulating sleeve extending out of the needle bar extends outwards along the radial direction to form an annular boss and is abutted against the end part of the needle bar; the middle part of the mounting seat is provided with a shaft shoulder, and the shaft shoulder of the mounting seat is propped against the annular boss.

4. An adjustable microwave ablation needle according to any of claims 1-3, wherein: the length of the needle has a plurality of preset specifications.

5. An adjustable microwave ablation needle according to any of claims 1-3, wherein: the needle head is a conical needle head, a triangular pyramid needle head, a round head needle head or an oblique ridge needle head.

6. An adjustable microwave ablation needle according to any of claims 1-3, wherein: the insulating sleeve is made of high polymer materials or ceramics.

7. An adjustable microwave ablation needle according to any of claims 1-3, wherein: grooves which are convenient for the holding operation of the apparatus are arranged on the needle head and the mounting seat.