CN107802343B - Split reducing microwave needle - Google Patents

Abstract

The invention provides a split-type reducing microwave needle which comprises a puncture needle core, wherein a reducing taper head is arranged on the outer ring of the rear part of the head end of the puncture needle core, the reducing taper head comprises a reducing taper head end and a reducing taper head tail end, the diameter from the reducing taper head end to the reducing taper head tail end increases gradually, and a sleeve is arranged in the tail end of the puncture needle core. The split reducing microwave needle can directly puncture the skin of a patient in operation and enter the focus position; less bleeding and post-operation healing time, and is beneficial to the postoperative recovery of patients.

Description

A split type variable diameter microwave needle

Technical Field

The invention relates to the field of medical equipment, in particular to a split-type variable-diameter microwave needle.

Background Art

Microwave ablation is a thermal ablation technology for tumor treatment that has developed rapidly in the past 10 years. There are two aspects to the heating mechanism of microwaves on biological tissues: one is dipole heating, which is also the main factor of microwave heating. Under the action of microwave electromagnetic fields with a frequency of >900MHz, the polarity of dipole charges such as water molecules in the tumor is unbalanced, and they change direction rapidly with the alternation of the microwave electric field, flip and collide with each other at a frequency of more than one million times per second, generating a large amount of heat to cause tissue degeneration and necrosis; on the other hand, ion heating is ion heating. Under the action of microwave electromagnetic fields, ions in tissues also change direction rapidly to vibrate and collide with each other, converting kinetic energy into thermal energy. It can be seen that the heating process of microwaves is that the tissue actively generates heat under the action of electromagnetic fields, and quickly reaches high temperatures in a short time. Compared with radiofrequency and laser ablation, microwave ablation has the characteristics of fast heating speed, strong blood vessel coagulation ability, less affected by blood flow factors, multiple antennas can act simultaneously, and the normal coagulation range is large and stable. It has become a treatment method with great potential and good application prospects in percutaneous thermal ablation and surgical ablation.

However, due to structural reasons, the outer diameter of traditional microwave needles is relatively large. Currently, the outer diameter specifications of commonly used microwave needles are 16G~13G (φ1.6mm~φ2.4mm), among which φ1.6mm, φ1.9mm, φ2.1mm and φ2.4mm are the most commonly used. Traditional microwave needles often use two structures: conical and triangular. Because the outer diameter of the microwave needle is large, the puncture resistance is large and the puncture ability is poor. Usually, it is not possible to puncture the patient's skin directly. The doctor needs to use a scalpel to make a small incision on the patient's skin to help the microwave needle enter the patient's body. On the other hand, when doctors encounter hard tumors, traditional microwave needles are difficult to directly puncture the hard outer shell of the tumor and enter the center of the tumor for ablation due to insufficient puncture force. In clinical practice, such as microwave ablation treatment of thyroid tumors, thyroid tumors have a hard outer shell, and traditional microwave needles cannot directly puncture the hard shell. Doctors can only use the method of microwave ablation and puncture at the same time to gradually send the traditional microwave needle to the center of the thyroid tumor and then perform precise microwave ablation on it. Traditional microwave needles have insufficient puncture force, which greatly increases the operation time and difficulty.

Summary of the invention

Purpose of the invention: The technical problem to be solved by the present invention is to provide a split variable diameter microwave needle in view of the deficiencies in the prior art.

In order to solve the above technical problems, the present invention provides a split variable diameter microwave needle, including a puncture needle core for microwave puncture, the puncture needle core includes a needle head, a variable diameter tapered head is provided at the rear of the needle head, the variable diameter tapered head includes a variable diameter tapered head head end and a variable diameter tapered head tail end, and the diameter from the variable diameter tapered head head end to the variable diameter tapered head tail end increases gradually.

In the present invention, the diameter of the head end of the tapered head is matched with the diameter of the puncture needle core, and the head end of the tapered head is stably fixed on the puncture needle core.

In the present invention, the variable-diameter tapered head and the puncture needle core are laser welded, which is stable and reliable, and is safer when puncturing harder tissues.

In the present invention, the puncture needle core is a standard puncture needle core with a size of 13G to 25G, which is small and has a strong puncture ability.

In the present invention, a sleeve is provided inside the puncture needle core for connecting a microwave transmission cable, and the sleeve can be a copper sleeve.

In the present invention, the rear end of the puncture needle core is connected to the microwave needle handle, which includes a microwave generator and a microwave transmission cable. One end of the microwave transmission cable is connected to the microwave generator, and the other end is connected to the sleeve of the puncture needle core.

In the present invention, a cavity for accommodating a microwave transmission cable is provided in the sleeve, and the microwave transmission cable extends into the cavity and is fixed to the sleeve by crimping.

In the present invention, the handle portion is further provided with a cooling system and a needle rod, the cooling system comprises a water cooling channel, and the water cooling channel is located in the gap between the needle rod and the microwave transmission cable.

Beneficial effects: 1. The split variable-diameter microwave needle can directly puncture the patient's skin and enter the lesion during surgery; it reduces bleeding and postoperative healing time, which is beneficial to the patient's postoperative recovery.

2. During the operation, the hard outer shell of the tumor can be directly punctured to enter the center of the lesion for ablation surgery, which greatly shortens the operation time and improves the accuracy of ablation, which is beneficial to the patient's postoperative recovery.

3. Since the microwave needle of the present invention has a strong puncture force, the puncture trauma is very small and will not cause tissue perforation, leakage, etc. This provides the possibility for percutaneous microwave ablation treatment of pancreatic cancer by puncturing the microwave needle through the skin and then through the stomach wall to reach the pancreas; it also provides the possibility for percutaneous microwave ablation treatment of gallbladder by microwave needle to ensure that the gallbladder does not leak, and ensure the gallbladder ablation treatment by microwave needle.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the above and other advantages of the present invention will become more clear.

FIG1 is a schematic diagram of the structure of a variable diameter microwave needle;

Fig. 2 is a cross-sectional view of a variable diameter microwave needle;

Fig. 3 is a cross-sectional view of a reducing taper head;

Fig. 4 is a cross-sectional view of the casing;

FIG5 is a cross-sectional view of the handle of a microwave needle.

DETAILED DESCRIPTION

The present invention will be described in detail below with reference to the accompanying drawings.

Example:

As shown in Figures 1 and 2, a split variable-diameter microwave needle provided in this embodiment includes a puncture needle core 6, a needle head 6a, a variable-diameter tapered head 7 and a sleeve 8. The variable-diameter tapered head 7 is connected to the standard puncture needle core 6 by laser welding and is arranged behind the needle head 6a. The sleeve 8 is installed in the tail of the standard puncture needle core 6 and is crimped with the inner core of the microwave transmission cable 2 to form a passage. In this embodiment, the sleeve 8 is a copper sleeve.

As shown in Figures 3 and 4, it includes a reducing tapered head head end 7a and a reducing tapered head tail end 7b, the diameter of the reducing tapered head head end to the reducing tapered head tail end increases, and the reducing tapered head in this embodiment is a hollow truncated cone structure. The reducing tapered head 7 and the puncture needle core 6 are laser welded.

The sleeve 8 is a hollow cylindrical structure, and a cavity 9 is provided inside thereof for accommodating the microwave transmission cable.

As shown in Figure 5, the microwave needle handle includes a microwave transmission cable 2, a needle rod 3, a cooling system 4 and a microwave generator 5. One end of the microwave transmission cable 2 is connected to the microwave generator 5, and the other end is connected to the sleeve 8 of the puncture needle core 6. The cooling system 4 includes a water cooling channel located in the gap between the needle rod 3 and the microwave transmission cable 2. The sleeve 8 is provided with a cavity 9 for accommodating the microwave transmission cable 2. The microwave transmission cable 2 extends into the cavity 9 and is fixed to the sleeve 8 by crimping. The microwave generator 5 transmits the microwave signal from the microwave transmission cable 2 to the microwave needle 1, and the microwave needle 1 radiates the energy to the lesion position, and microwave ablation is performed on the tissue around the microwave needle.

Due to structural reasons, the outer diameter of traditional microwave needles is relatively large. Currently, the outer diameter specifications of commonly used microwave needles are 16G~13G (φ1.6mm~φ2.4mm), among which φ1.6mm, φ1.9mm, φ2.1mm and φ2.4mm are the most commonly used. Traditional microwave needles often use conical and triangular structures. Due to the large outer diameter of microwave needles, the puncture resistance is large and the puncture ability is poor. Normally, the patient's skin cannot be punctured directly. The doctor needs to use a scalpel to make a small incision on the patient's skin to help the microwave needle enter the patient's body.

Compared with the traditional microwave needle, the biggest difference between the present invention and the traditional microwave needle is that the microwave needle head adopts a split variable-diameter microwave needle head, which greatly improves the puncture ability of the microwave needle. In this embodiment, the microwave needle head uses a 13G to 25G standard puncture needle core 6, a variable-diameter tapered head 7 and a sleeve 8. The standard puncture needle core 6 is exactly the same as the traditional standard puncture needle core. Its puncture force has been widely confirmed and widely used in the medical industry. Its puncture ability is beyond doubt. The variable-diameter tapered head 7 is connected to the standard puncture needle core 6 by laser welding, and the sleeve 8 is installed in the tail of the standard puncture needle core 6 and crimped with the inner core of the microwave transmission cable 2 to form a passage. The microwave signal is transmitted to the split microwave needle head by the microwave transmission cable 2, and the split microwave needle head radiates the microwave energy to the surrounding lesion location to perform ablation surgery on the surrounding tissue.

The variable diameter conical head 7 reduces the outer diameter of the puncture part of the microwave needle tip, greatly reducing its puncture resistance, thereby improving the puncture effect. The split variable diameter microwave needle can directly puncture the patient's skin and the hard shell of the tumor to enter the center of the lesion, providing a good tool for doctors to carry out percutaneous microwave ablation surgery. It is a treatment method with great potential and good application prospects.

The present invention provides a split variable diameter microwave needle. There are many methods and ways to implement the technical solution. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention. All components not specified in this embodiment can be implemented by existing technologies.

Claims (6)

1. A split reducing microwave needle, which is characterized by comprising a puncture needle core (6) for microwave puncture, wherein the puncture needle core (6) is a standard puncture needle core with the size of 13G to 25G; the puncture needle core (6) comprises a needle head (6 a), wherein the needle head (6 a) is in a hollow circular tube shape, and the tail end of the needle head is provided with a left section, a right section and a right section; the rear part of the needle head (6 a) is provided with a reducing taper head (7), the reducing taper head (7) comprises a reducing taper head end (7 a) and a reducing taper head tail end (7 b), the diameter from the reducing taper head end to the reducing taper head tail end (7 b) increases progressively, and the reducing taper head end (7 a) is closer to the tail end of the needle head (6 a) than the reducing taper head tail end (7 b); the diameter of the head end (7 a) of the reducing taper head is matched with the diameter of the puncture needle core (6).

2. The split reducing microwave needle according to claim 1, characterized in that the reducing taper head (7) and the puncture needle core (6) are welded by laser.

3. The split reducing microwave needle according to claim 1, characterized in that a sleeve (8) is arranged inside the puncture needle core (6).

4. The split reducing microwave needle according to claim 1, wherein the rear end of the puncture needle core (6) is connected with a microwave needle handle part, the microwave needle handle part comprises a microwave generator (5) and a microwave transmission cable (2), one end of the microwave transmission cable (2) is connected with the microwave generator (5), and the other end is connected into a sleeve (8) of the puncture needle core (6).

5. The split reducing microwave needle according to claim 4, wherein a cavity (9) for accommodating the microwave transmission cable (2) is arranged in the sleeve (8), and the microwave transmission cable (2) extends into the cavity (9) and is fixed with the sleeve (8) by crimping.

6. The split reducing microwave needle according to claim 4, characterized in that the microwave needle handle part is further provided with a cooling system (4) and a needle bar (3), the cooling system (4) comprises a water cooling channel, and the water cooling channel is positioned at a gap between the needle bar (3) and the microwave transmission cable (2).