KR-20260067525-A - Endoscopic Submucosal Dissection Knife with Both Cutting Blade and Semi-ellipsoidal Insulating Tip

Abstract

The present invention relates to an ESD knife comprising a wire providing a high-frequency current, an incision electrode provided at the tip of the wire for cutting and dissecting a lesioned mucosal area, and an insulating tip coupled to the tip of the incision electrode; in particular, the incision electrode is composed of a center portion having a through hole formed therein that is coupled to the wire, and a cutting portion consisting of a plurality of cutting blades formed extending in different directions from the center portion; wherein the height of the plurality of cutting blades is configured to gradually decrease as they move away from the center portion toward the edge of the insulating tip, thereby improving the cutting force on the lesioned mucosal area and preventing the incised mucosal area from adhering to the surface of the cutting blades.

Inventors

• 백재민
• 홍완기

Assignees

• 국립강릉원주대학교산학협력단

Dates

Publication Date

20260513

Application Date

20241106

Claims (5)

1. An ESD knife comprising a wire (20) providing a high-frequency current, an incision electrode (30) provided at the tip of the wire (20) for cutting and dissecting a lesion mucosal area, and an insulating tip (40) coupled to the tip of the incision electrode (30), The above-mentioned cutting electrode (30) is composed of a center portion (31) having a through hole (31a) formed therein that is coupled through the wire (20), and a cutting portion (32) consisting of a plurality of cutting blades (32a) formed extending in different directions from the center portion (31). An ESD knife characterized in that the height of the plurality of cutting blades (32a) gradually decreases as they move away from the center portion (31) toward the edge of the insulating tip (40).
2. In claim 1, An ESD knife characterized in that the plurality of cutting blades (32a) are formed in a cuboid shape having a square cross-section.
3. In claim 1, An ESD knife characterized in that the angle between the plurality of cutting blades (32a) is 120 degrees.
4. In claim 1, The above insulating tip (40) is configured with a three-dimensional shape in which the front end and rear end are flat circular shapes, and the side portion connecting the front end and rear end is an outwardly convex curved shape with a diameter that gradually decreases towards the front end. An ESD knife characterized in that the distance (L) between the front end and the rear end is formed to be longer than half the diameter (D1) of the rear end.
5. In claim 4, The above-described insulating tip (40) is characterized in that the front end and the rear end are formed as concentric circles, the diameter (D1) of the rear end is 2.3 to 2.6 times the diameter (D2) of the front end, and the distance (L) between the front end and the rear end is 0.80 to 0.85 times the diameter (D1) of the rear end.

Description

ESD Knife with Both Cutting Blade and Semi-ellipsoidal Insulating Tip The present invention relates to an ESD (Endoscopic Submucosal Dissection) knife, and more specifically, to an ESD knife capable of improving cutting power over a lesioned mucosal area and penetrating the mucosal area more effectively. This project (result) is the result of the Phase 3 Leading University Industry-Academic Cooperation Project (LINC 3.0), funded by the Ministry of Education and the National Research Foundation of Korea. Recently, so-called endoscopic submucosal dissection (ESD) is being widely performed to resect malignant and benign lesions in the submucosal layer of body cavities, such as the esophagus, stomach, small intestine, and large intestine, by inserting a high-frequency knife using an endoscope without open surgery. In other words, endoscopic submucosal dissection (ESD) is a method that uses a radiofrequency knife to penetrate the submucosal tissue beneath the lesion and resect the tumor in a single operation by peeling it away little by little. Clinically, it is widely performed because it helps improve cure rates and shorten recovery periods by enabling simultaneous diagnosis and treatment. A conventional high-frequency knife used for such endoscopic submucosal dissection is composed of a wire that provides a high-frequency current, an incision electrode provided at the tip of the wire for incising a lesioned mucosal area, and an insulating tip fixed at the tip of the incision electrode, so that when a high-frequency current is applied to the incision electrode through the wire, the incision electrode incises the lesioned mucosal area. Most of these conventional high-frequency knives have cutting electrodes that are simply circular or angular, but such cutting electrodes often lack sufficient cutting power for the mucosal area, and conventional insulating tips are often hemispherical or cylindrical in shape with only the tip slightly tapered, which makes it difficult to penetrate the mucosal area. FIG. 1 is a perspective view showing an ESD knife according to the present invention. FIGS. 2 and FIGS. 3 show the cut electrode and insulating tip illustrated in FIGS. 1. Hereinafter, an embodiment of the ESD knife according to the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a perspective view showing an ESD knife according to the present invention, and FIG. 2 and FIG. 3 are drawings showing the cutting electrode and insulating tip shown in FIG. 1. The ESD knife according to the present invention is configured to cut the mucosal portion of a lesion tissue and separate it from the muscle layer, and comprises a main body (10), a wire (20) installed on the main body (10), an incision electrode (30) installed on the wire (20) to cut the mucosal portion of the lesion, and an insulating tip (40) coupled to the tip of the incision electrode (30). The above main body (10) is a part that the user holds and operates with their hand, and is equipped with an electrode part (11). The electrode portion (11) is connected to an external power source to apply a high-frequency current. This electrode portion (11) is electrically connected to a wire (20) so that an external high-frequency current is applied to the cutting electrode (30) through the wire (20). The above wire (20) provides high-frequency current, and since it is made using a highly conductive material such as stainless steel, the high-frequency current provided from the electrode part (11) can be applied to the cutting electrode (30). The above-mentioned cutting electrode (30) is provided at the tip of the wire (20) and cuts and separates the mucosal area of the lesion when a high-frequency current is applied. This cutting electrode (30) is made using stainless steel and the tip portion of the wire (20) is connected through the center. To explain in more detail, the above-mentioned cutting electrode (30) is composed of a center portion (31) and a cutting portion (32) that is integrally formed with the center portion (31) and substantially cuts and separates the lesion mucosa portion. The center portion (31) is joined by a wire (20) penetrating the central part. That is, a through hole (31a) is formed in the center of the center portion (31), and the wire (20) is inserted and passes through this through hole (31a). The above cutting section (32) is composed of a plurality of cutting blades (32a) formed integrally with the center section (31). The above-mentioned plurality of cutting blades (32a) are formed by extending in different directions from the center portion (31). The height of these plurality of cutting blades (32a) gradually decreases as they move away from the center portion (31) toward the edge of the insulating tip (40). Here, when the cutting blade (32a) extends outward from the center portion (31), it is formed in the shape of a general cube or rectangular prism with a square cross-section, and as the hei