CN105726121B

CN105726121B - Sleeve loading type multi-slit electromagnetic hemostasis needle

Info

Publication number: CN105726121B
Application number: CN201610072797.5A
Authority: CN
Inventors: 冯曦; 林先其; 刘王毛; 李波; 刘非; 刘剑
Original assignee: West China Hospital of Sichuan University
Current assignee: West China Hospital of Sichuan University
Priority date: 2016-02-02
Filing date: 2016-02-02
Publication date: 2020-07-14
Anticipated expiration: 2036-02-02
Also published as: CN105726121A

Abstract

The invention discloses a sleeve loading type multi-slit electromagnetic hemostasis needle, which belongs to the field of medical equipment and comprises an outer conductor (1) and an inner conductor (2), wherein the outer conductor (1) is a hollow cylinder, the inner conductor (2) is arranged in the outer conductor (1), a dielectric layer (3) is filled between the inner conductor (2) and the outer conductor (1), the outer conductor (1) is provided with an annular slit (4), and a metal sleeve (5) which is matched with the outer diameter of the outer conductor (1) and can slide along the axial direction of the outer conductor (1) is sleeved on the outer conductor (1). The invention adjusts the number of the effective gaps into one or more gaps freely by adjusting the position of the metal sleeve according to the electromagnetic shielding principle, thereby changing the action range and the effect shape of the electromagnetic waves, and carrying out liver resection according to specific requirements or establishing a continuous ablation hemostasis surface or carrying out local ablation treatment by concentrating the thermal ablation effect in a circular range.

Description

Sleeve loading type multi-slit electromagnetic hemostasis needle

Technical Field

The invention relates to medical equipment, in particular to a multi-slit electromagnetic hemostasis needle which can change the action range and the effect shape of electromagnetic waves by adjusting the position of a sleeve.

Background

For hepatic neoplastic disease, the best treatment regimen is now recognized as surgical resection. However, surgical resection of a liver tumor is not suitable for every patient. If the primary or metastatic tumor of the liver has intrahepatic or extrahepatic metastasis, the surgical resection has no obvious significance; in addition, most of liver tumor patients in China have reduced liver reserve function due to long-term damage of hepatitis viruses and severe liver cirrhosis, and cannot tolerate surgical resection; under the above circumstances, a therapy for killing tumor cells by ablation of only a local tumor lesion has been widely accepted. Before surgery, the surgeon will plan a treatment plan based on the patient's specific condition, and plan surgical resection or local tumor ablation. However, the existing preoperative examination technology cannot completely and accurately judge the condition of the patient, so that the condition that a surgeon changes a treatment plan during the operation according to the intraoperative exploration result occurs, namely, an excision plan is planned and the partial ablation is temporarily changed to be performed, or the partial ablation is planned and the surgical excision is temporarily changed to be performed. Liver resection has the characteristics of high difficulty and high risk, and has high requirements on operators. The existing various liver resection devices have the defects of slow resection time in different degrees, various and complicated surgical operation processes, much bleeding and the like, and do not have the capability of being used as local ablation treatment. In addition, the ablation effect shapes of the existing various liver partial ablation devices are all single round-like shapes, so that an ideal cutting plane cannot be formed according to the requirements of surgeons, and the existing liver partial ablation devices cannot be used as liver resection devices. Therefore, in actual surgical operation, no equipment can meet the requirements of a surgeon for liver resection and local ablation at home and abroad.

Disclosure of Invention

The invention aims to provide a sleeve loading type multi-slit electromagnetic hemostasis needle, which freely adjusts the number of effective slits to one or more by adjusting the position of a metal sleeve according to an electromagnetic shielding principle, thereby changing the action range and the effect shape of electromagnetic waves, and carrying out liver resection according to specific requirements or establishing a continuous ablation hemostasis surface, or carrying out local ablation treatment by concentrating the thermal ablation effect in a circular range.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the invention discloses a sleeve loading type multi-gap electromagnetic hemostasis needle which comprises an outer conductor and an inner conductor, wherein the outer conductor is a hollow cylinder, the inner conductor is arranged in the outer conductor, a dielectric layer is filled between the inner conductor and the outer conductor, the outer conductor is provided with an annular gap, and a metal sleeve which is matched with the outer diameter of the outer conductor and can axially slide along the outer conductor is sleeved on the outer conductor.

The using method comprises the following steps: through the excitation of the adaptive electromagnetic signals, the outer conductor with the gaps can form multi-point electromagnetic radiation, the axial size of each section of the outer conductor can be matched with the working wavelength, the working range of the hemostatic needle is enlarged, the requirement of a longer operation wound can be met, and the whole wound can be cauterized at one time so as to establish a tourniquet; by sliding the metal sleeve, one or more gaps (the outer conductors on two sides of the gaps are connected) can be selectively shielded, and different working ranges and shapes of the hemostatic needle can be formed, so that the hemostatic needle can be applied to different treatment requirements.

Preferably, the inner conductor is cylindrical and coaxial with the outer conductor.

Preferably, the number of the slits is at least two, and the slits are arranged along the axial direction of the outer conductor.

Further, the number of the metal sleeves is equal to the number of the slits.

Further, the length of the metal sleeve is larger than the width of the gap.

Preferably, the length of the metal sleeve is greater than the distance between the two slits that are farthest apart.

Preferably, the outer conductor and the inner conductor are connected to the base.

Further, the outer conductor and the inner conductor are welded on the base.

Further, the base is provided with an input port, and the inner conductor is communicated with the input port.

The invention has the following beneficial effects:

1. the sleeve loading type multi-slit electromagnetic hemostatic needle has a reasonable structure, and can be applied to surgical treatment of human liver parenchyma excision and tumor thermal ablation;

2. the metal sleeve ring is tightly attached to the outer conductor of the electromagnetic hemostasis needle and tightly wrapped outside the gap, and the metal at two sides of the gap is connected, so that various different ablation shapes can be effectively realized, and various different surgical liver operation requirements can be met;

3. the curative effect is definite, the operation time can be obviously shortened, the operation is simplified, and the intraoperative hemorrhage is obviously reduced;

4. the heating shape is changeable, one needle is multi-purpose, the resource is saved, and the cost of the patient and the manufacturing cost are reduced.

Drawings

FIG. 1 is a schematic structural diagram according to a first embodiment;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic view of a base;

FIG. 4 is a left side view of FIG. 3;

FIG. 5 is a schematic structural diagram of the second embodiment;

FIG. 6 is a temperature field contour distribution of a first gap additive metal sleeve;

FIG. 7 is a temperature field contour distribution of the first and third gap additive metal sleeves;

FIG. 8 is a graph of the resulting values of the reflection coefficients for the first gap-added metal sleeve and the first and third gap-added metal sleeves;

in the figure: 1-outer conductor, 2-inner conductor, 3-dielectric layer, 4-gap, 5-metal sleeve, 6-base, 7-input port, 41-first gap, 42-second gap, 43-third gap, and 44-fourth gap.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.

The first embodiment is as follows:

as shown in fig. 1-4, the invention includes an outer conductor 1 and an inner conductor 2, the outer conductor 1 is a hollow cylinder, the inner conductor 2 is arranged in the outer conductor 1, a dielectric layer 3 is filled between the inner conductor 2 and the outer conductor 1, the outer conductor 1 is provided with an annular gap 4, the outer conductor 1 is sleeved with a metal sleeve 5 which is adapted to the outer diameter of the outer conductor 1 and can slide along the axial direction of the outer conductor 1, the radius of the outer conductor 1 is 1.8mm, the thickness of the dielectric layer 3 is 0.9mm, and the radius of the inner conductor 2 is 0.9 mm; the metal sleeve 5 has a radius of 1.9 mm.

Preferably, the inner conductor 2 is cylindrical, and the inner conductor 2 is coaxial with the outer conductor 1.

Preferably, there are four slits 4, and the four slits 4 are arranged along the axial direction of the outer conductor 1, and the distance between each slit 4 is 2.5 cm.

Further, the widths of the slots 4 increase from the connection end to the tip end of the outer conductor 1, the width of the first slot 41 is 1mm, the width of the second slot 42 is 1.3mm, the width of the third slot 43 is 1.7mm, and the width of the fourth slot 44 is 2.2 mm.

Preferably, the length of the metal sleeve 5 is greater than the distance between the two slits 4 that are furthest apart.

Preferably, the outer conductor 1 and the inner conductor 2 are connected to the base 6.

Further, the outer conductor 1 and the inner conductor 2 are soldered to the base 6.

Further, the base 6 is provided with an input port 7, and the inner conductor 2 communicates with the input port 7.

Example two:

as shown in fig. 5, the metal sleeve 5 of the first embodiment having a length greater than the distance between the two slits 4 which are farthest away is replaced by the metal sleeve 5 having a length greater than the width of the slit 4, and the number of the metal sleeves 5 is equal to the number of the slits 4, i.e., one metal sleeve 5 is allocated to each slit 4.

Fig. 6 shows the contour distribution of the temperature field at the first slit 41 plus the metal sleeve 5, and it can be seen that the temperature field distribution is in the shape of a nearly cylinder.

Fig. 7 shows the contour line distribution of the temperature field of the first slit 41 and the third slit 43 with the addition of the metal sleeve 5, it being seen that the temperature field distribution is shaped like an "8", and in combination with fig. 6, two heating shapes have been realized.

Fig. 8 shows the result of the reflection coefficients when the metal sleeve 5 is added to the first slit 41 and the

third slit

41 and 43, and the reflection coefficients are lower than-10 dB in both cases at 2.45GHz, which greatly represents the high efficiency of energy use.

The above-described examples should be understood that the scope of the present invention is not limited to such specific statements and embodiments. The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a many gaps of sleeve loading type electromagnetism hemostasis needle which characterized in that: the cable comprises an outer conductor (1) and an inner conductor (2), wherein the outer conductor (1) is a hollow cylinder, the inner conductor (2) is arranged in the outer conductor (1), a dielectric layer (3) is filled between the inner conductor (2) and the outer conductor (1), the outer conductor (1) is provided with an annular gap (4), and the outer conductor (1) is sleeved with a metal sleeve (5) which is matched with the outer diameter of the outer conductor (1) and can axially slide along the outer conductor (1); at least two gaps (4) are arranged, and the gaps (4) are axially arranged along the outer conductor (1);

the number of the metal sleeves (5) is equal to the number of the slits (4), the temperature field distribution of the first slit (41) plus one metal sleeve (5) is in a shape of a nearly cylinder, or the temperature field distribution of the first slit (41) and the third slit (43) plus two metal sleeves (5) is in a shape similar to a '8'.

2. The sleeve-loading type multi-slit electromagnetic hemostatic needle according to claim 1, characterized in that: the inner conductor (2) is cylindrical, and the inner conductor (2) is coaxial with the outer conductor (1).

3. The sleeve-loading type multi-slit electromagnetic hemostatic needle according to claim 1, characterized in that: the length of the metal sleeve (5) is larger than the width of the gap (4).

4. The sleeve-loading type multi-slit electromagnetic hemostatic needle according to claim 1, characterized in that: the outer conductor (1) and the inner conductor (2) are connected with the base (6).

5. The sleeve-loading type multi-slit electromagnetic hemostatic needle according to claim 1, characterized in that: the outer conductor (1) and the inner conductor (2) are welded on the base (6).

6. The sleeve-loading type multi-slit electromagnetic hemostatic needle according to claim 4 or 5, characterized in that: the base (6) is provided with an input port (7), and the inner conductor (2) is communicated with the input port (7).