WO2017133024A1

WO2017133024A1 - Multi-opening electromagnetic hemostat needle mounted on cannula

Info

Publication number: WO2017133024A1
Application number: PCT/CN2016/073847
Authority: WO
Inventors: 冯曦; 林先其; 李波; 刘王毛; 刘剑; 刘非; 魏永刚
Original assignee: 四川大学华西医院
Priority date: 2016-02-02
Filing date: 2016-02-16
Publication date: 2017-08-10

Abstract

The present invention relates to the field of medical devices. Disclosed is a multi-opening electromagnetic hemostat needle mounted on a cannula, comprising an outer conducting body (1) and an inner conducting body (2). The outer conducting body (1) is a hollow cylinder. The inner conducting body (2) is provided within the outer conducting body (1). A filling layer (3) fills a gap between the inner conducting body (2) and the outer conducting body (1). The outer conducting body (1) is provided with an annular opening (4). A metal cannula (10) matching an outer diameter of the outer conducting body (1) is sleeved around the outer conducting body (1), wherein the cannula is able to slide along the outer conducting body (1) in an axial direction. The multi-opening electromagnetic hemostat needle mounted on the cannula has an intricate structure. The invention addresses the issue of a water-based circulation cooling system in an electromagnetic hemostat needle and effectively reduces the size of the electromagnetic hemostat needle. A position of the metal cannula (10) can also be adjusted to freely change, using the principle of electromagnetic shielding, between one and several effective openings (4) and to adjust an operating range and an effective shape of an electromagnetic wave.

Description

Sleeve-loaded multi-slit electromagnetic hemostatic needle

Technical field

The invention relates to a medical device, in particular to a sleeve loading type multi-slit electromagnetic hemostatic needle.

Background technique

For liver neoplastic diseases, the best accepted treatment is surgical resection. However, surgical resection of liver tumors is not suitable for every patient. If the primary or metastatic tumor of the liver occurs intrahepatic or extrahepatic metastasis, there is no significant significance for surgical resection at this time. In addition, most of the liver cancer patients in China are often accompanied by severe cirrhosis due to long-term damage of hepatitis virus. However, the reduction of liver reserve function can not tolerate surgical resection; under the above circumstances, the treatment of killing tumor cells only by ablation of local tumor lesions is widely recognized. Before surgery, the surgeon will make a treatment plan based on the patient's specific condition, and plan a surgical resection or local tumor ablation. However, the existing preoperative examination technique level can not completely accurately determine the patient's condition, thus causing the surgeon to change the treatment plan according to the intraoperative exploration result during the operation, that is, the planned resection plan is temporarily changed to the local ablation. Or to perform local ablation and temporarily change to surgical resection.

Liver resection has the characteristics of high difficulty and high risk, and it has high requirements for the surgeon. The various liver resection devices available have different degrees of slow removal time, complicated and complicated operation procedures, and many bleeding defects, and are not used as local ablation treatment.

Due to the complex internal structure of the electromagnetic lancet, the larger size has always hindered its practical application. Treatment is not possible for some smaller, narrower areas. In addition, various existing local ablation devices for liver have a single ablation-like shape, which cannot form an ideal cutting plane according to the surgeon's requirements, and cannot be used as a liver resection device. Therefore, in actual surgery, there is no device at home and abroad that can meet the needs of surgeons for liver resection and local ablation.

Summary of the invention

The invention aims to provide a sleeve-loading type multi-slit electromagnetic hemostatic needle, which has a compact structure and can adjust the position of the metal sleeve to adjust the number of effective gaps to one or more by the electromagnetic shielding principle. Changing the range of action of the electromagnetic wave and the effect shape, while solving the problem of the electromagnetic hemostatic needle water-cooling circulation system, effectively reducing the size of the electromagnetic hemostatic needle.

In order to achieve the above object, the technical solution adopted by the present invention is as follows:

A sleeve-loading type multi-slit electromagnetic hemostatic needle disclosed in the present invention comprises an outer conductor and an inner conductor, wherein the outer conductor is a hollow cylinder, and the inner conductor is disposed in the outer conductor, and the inner conductor and the outer conductor are filled There is a dielectric layer, the outer conductor is provided with an annular slit, and the outer conductor is sleeved with a metal sleeve adapted to the outer diameter of the outer conductor and axially slidable along the outer conductor.

Usage: Excited electromagnetic signal, the outer conductor with gap can form multi-point electromagnetic radiation, adjust the axial size and position of the metal sleeve, and complete the complete pre-cut surface in one time. The hemostatic surface is used for liver parenchymal cutting; by sliding the metal sleeve, one or more slits are selectively shielded, that is, different working ranges and shapes of the hemostatic needle can be formed, thereby achieving thermal ablation treatment for unremovable lesions in the liver. effect.

Preferably, the gap has at least two.

Preferably, the slits are arranged axially along the outer conductor.

Further, the number of the metal sleeves is one or more, and the length of the metal sleeve is greater than the width of the slit.

Preferably, the inner conductor is a hollow cylinder, and a water conduit is disposed in the inner conductor, the water conduit is placed along the inner conductor axially, and a gap is formed between the water conduit and the inner conductor.

Preferably, the outer conductor and the inner conductor are coaxial with the water conduit.

Further, the outer conductor, the inner conductor and the water conduit are connected to the base.

Further, the base is provided with an input port, a water inlet channel and a water outlet channel, the inner conductor is in communication with the input port, the water inlet channel is in communication with the water conduit, and the water outlet channel is in communication with the gap between the inner conductor and the water conduit.

Preferably, a gap between the inner conductor and the water conduit is provided with a thermocouple, and the outer surface of the thermocouple is coated with an insulating varnish.

The invention has the following beneficial effects:

1. The water conduit divides the hollow inner conductor into two spaces, and these two spaces are respectively used as the water inlet portion and the water outlet portion of the water-cooled circulation system, and effectively solve the problem of the electromagnetic hemostatic needle water-cooling circulation system, and effectively reduce the electromagnetic hemostasis. Needle size;

2. The cooling structure is arranged in the inner conductor to effectively reduce the temperature of the needle body and reduce the degree of carbonization of the object on the contact surface;

3. It is used to test the temperature of the hemostatic needle. When the temperature is too high, the radiation needle is disconnected in time to avoid burning the liver;

4. The thermocouple has small volume, good seismic performance, high measurement accuracy and wide thermal response time;

5. The thermocouple is coated with insulating paint on the outside, which can be immersed in water. It can effectively and safely measure the temperature without expanding the size of the electromagnetic hemostatic needle.

6. The sleeve-loaded multi-slit electromagnetic hemostatic needle has a reasonable structure and can be applied to surgical resection and ablation treatment of human liver tumors;

7. The metal sleeve ring is closely attached to the outer surface of the electromagnetic hemostatic needle and tightly wrapped around the gap. The metal connecting the two sides of the gap can effectively realize various ablation shapes and meet various surgical liver surgery requirements;

8. Efficacy, can significantly shorten the operation time, simplify the operation and significantly reduce intraoperative bleeding;

9. Its heating shape is variable, and one needle is used more, saving resources, reducing patient cost and manufacturing cost.

DRAWINGS

1 is a schematic structural view of Embodiment 1;

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

Figure 3 is a schematic view of the base;

Figure 4 is a left side view of Figure 3;

Figure 5 is a schematic structural view of Embodiment 2;

Figure 6 is a contour distribution of the temperature field of the first slit plus the sleeve;

Figure 7 is a temperature field contour distribution of the first slit and the third slit adding sleeve;

Figure 8 is a result of the reflection coefficient of the first slit adding sleeve and the first slit and the third slit adding sleeve;

In the figure: 1-outer conductor, 2-inner conductor, 3-medium layer, 4-gap, 5-pipe, 6-thermocouple, 7-base, 8-input port, 9-inlet channel, 10-metal sleeve Cartridge, 11-outlet channel, 41-first slit, 42-second slit, 43-third slit, 44-four slit.

detailed description

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

Embodiment 1:

As shown in FIGS. 1-4, the present invention includes an outer conductor 1, an inner conductor 2, an outer conductor 1 which is a hollow cylinder, an inner conductor 2 is disposed in the outer conductor 1, and a dielectric layer is filled between the inner conductor 2 and the outer conductor 1. 3, the outer conductor 1 is provided with an annular slit 4, the outer conductor 1 is sleeved with a metal sleeve 10 adapted to the outer diameter of the outer conductor 1 and axially slidable along the outer conductor 1, the outer conductor 1 having a radius of 1.8 mm, The dielectric layer 3 has a thickness of 0.9 mm, the inner conductor 2 has a radius of 0.9 mm, and the metal sleeve 10 has a radius of 1.9 mm.

Preferably, there are at least two slits 4.

Further, the slits 4 are arranged axially along the outer conductor 1 at a distance of 2.5 cm.

Preferably, the width of the slit 4 is sequentially increased from one end to the other end of the outer conductor 1, the first electromagnetic gap The width of 41 is 1 mm, the width of the second electromagnetic gap 42 is 1.3 mm, the width of the third electromagnetic gap 43 is 1.7 mm, and the width of the fourth electromagnetic gap 44 is 2.2 mm.

Preferably, the inner conductor 2 is a hollow cylinder, and the inner conductor 2 is provided with a water conduit 5, and the water conduit 5 is placed along the inner conductor 2 in the axial direction, and there is a gap between the water conduit 5 and the inner conductor 2, and the length of the water conduit 5 is 14cm, width 0.8mm.

Preferably, the outer conductor 1 and the inner conductor 2 are coaxial with the water conduit 5.

Further, the outer conductor 1, the inner conductor 2 and the water conduit 5 are connected to the base 7.

Further, the base 7 is provided with an input port 8, a water inlet passage 9, and a water outlet passage 11, the inner conductor 2 is in communication with the input port 8, the water inlet passage 9 is in communication with the water conduit 5, and between the water outlet passage 11 and the inner conductor 2 and the water conduit 5. The gap is connected.

Preferably, a gap between the inner conductor 2 and the water conduit 5 is provided with a thermocouple 6, and the outer surface of the thermocouple 6 is coated with an insulating varnish.

Embodiment 2:

As shown in FIG. 5, one metal sleeve 10 in the first embodiment is replaced with a metal sleeve 10 having a length greater than the width of the slit 4, and the number of the metal sleeves 10 is equal to the number of the slits 4, that is, one for each slit 4. Corresponding to the metal sleeve 10.

Of course, the number of the metal sleeves 10 can be equipped according to actual needs, and does not necessarily have to be equal to the number of the slits 4.

Fig. 6 is a distribution of the temperature field contour of the metal sleeve 10 in the first slit 41. It can be seen that the temperature field distribution is a shape of a near cylinder.

7 is a temperature field contour distribution in which the first slit 41 and the third slit 43 are added with the metal sleeve 10. It can be seen that the temperature field distribution is a shape similar to "8", and combined with FIG. 6, two types have been realized. Heat the shape.

8 is a result of the reflection coefficient when the first slit 41 is added with the sleeve and the first slit 41 and the third slit 43 are added with the metal sleeve 10. At 2.45 GHz, the reflection coefficients of both cases are lower than -10 dB. Greatly reflects the high efficiency of energy use.

The invention may, of course, be embodied in a variety of other embodiments, and various changes and modifications can be made in accordance with the present invention without departing from the spirit and scope of the invention. And modifications are intended to fall within the scope of the appended claims.

Claims

A sleeve-loading type multi-slot electromagnetic hemostatic needle, comprising: an outer conductor (1), an inner conductor (2), the outer conductor (1) is a hollow cylinder, and the inner conductor (2) is disposed on In the outer conductor (1), a dielectric layer (3) is filled between the inner conductor (2) and the outer conductor (1), and the outer conductor (1) is provided with an annular slit (4), and the outer conductor (1) The sleeve has a metal sleeve (10) adapted to the outer diameter of the outer conductor (1) and axially slidable along the outer conductor (1).
A sleeve-loaded multi-slit electromagnetic hemostatic needle according to claim 1, wherein said slit (4) has at least two.
A sleeve-loaded multi-slit electromagnetic hemostatic needle according to claim 2, characterized in that the slits (4) are arranged axially along the outer conductor (1).
A sleeve-loading type multi-slit electromagnetic hemostatic needle according to any one of claims 1 to 3, characterized in that the metal sleeve (10) has one, and the length of the metal sleeve (10) is larger than The width of the slit (4).
A sleeve-loading type multi-slit electromagnetic hemostatic needle according to any one of claims 1 to 3, characterized in that the metal sleeve (10) has at least two, the metal sleeve (10) The length is greater than the width of the slit (4).
The sleeve-loading type multi-slit electromagnetic hemostatic needle according to claim 1, wherein the inner conductor (2) is a hollow cylinder, and the inner conductor (2) is provided with a water conduit (5). The water conduit (5) is placed axially along the inner conductor (2), and there is a gap between the water conduit (5) and the inner conductor (2).
A sleeve-loading type multi-slit electromagnetic hemostatic needle according to claim 6, wherein said outer conductor (1) and inner conductor (2) are coaxial with said water conduit (5).
A sleeve-loaded multi-slit electromagnetic hemostatic needle according to claim 7, characterized in that The outer conductor (1), the inner conductor (2) and the water conduit (5) are connected to the base (7).
A sleeve-loading type multi-slit electromagnetic hemostatic needle according to claim 8, wherein the base (7) is provided with an input port (8), a water inlet channel (9), and a water outlet channel (11), The inner conductor (2) is in communication with the input port (8), the water inlet passage (9) is in communication with the water conduit (5), and the outlet passage (11) is in communication with the gap between the inner conductor (2) and the water conduit (5).
A sleeve-loading type multi-slit electromagnetic hemostatic needle according to claim 6, wherein a gap between the inner conductor (2) and the water conduit (5) is provided with a thermocouple (6), The outer surface of the thermocouple (6) is coated with an insulating varnish.