Sleeve rope incision knife

Abstract

The utility model relates to the technical field of medical instruments and equipment, and discloses a snare rope incision knife which comprises an outer sheath tube and a snare rope capable of entering and exiting from one end of the outer sheath tube, a thulium knife piece is connected to the snare rope and comprises a thulium knife head and a connection portion, and a cylindrical groove is formed in the end, away from the thulium knife head, of the connection portion in a sunken mode. The snare rope incision knife further comprises a cylindrical piece, the cylindrical piece is fixedly arranged in the cylindrical groove, and a through hole for the snare rope to penetrate through is further formed in the cylindrical piece in the radial direction of the cylindrical piece. The thulium knife piece has the advantages that the snare rope can be fully extruded, the snare rope cannot move, the snare rope is fully contacted with the cylindrical groove, and the snare rope and the thulium knife piece are guaranteed to have a good telecommunication conduction effect.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a snare rope cutting knife. Background Art

[0002] Endoscopic mucosal dissection is used to treat early gastrointestinal cancer and other diseases, allowing more gastrointestinal lesions to be completely removed in large pieces under endoscopy at one time. It has the characteristics of less trauma, good efficacy, and high surgical technical requirements.

[0003] The implementation process of endoscopic mucosal dissection is to first mark the lesion site with a mucosal cutter, replace the injection needle to inject saline under the mucosa, and then replace the mucosal cutter to dissect the lesion. The surgical instruments need to be frequently replaced during the operation, which has the disadvantages of being cumbersome and time-consuming.

[0004] In order to address this defect, patent CN109771027A discloses a multifunctional incision knife, which provides a mucosal incision knife that integrates thulium knife, water injection, and snare functions. Specifically, on the basis of the original snare, a thulium knife is combined with the snare rope, the thulium knife is used to mark and cut the lesion, the water injection function is used to elevate the lesion, and finally the snare rope is used to peel off the mucosa, solving the cumbersome and time-consuming defects.

[0005] However, the combination of the thulium cutter and the snare rope in the multifunctional cutting knife is that one end of the snare rope is inserted into a groove body provided on the thulium cutter, and the snare rope is fixed in the groove body by a pin to prevent the snare rope from escaping from the groove body;

[0006] This combination has defects: first, the snare rope is fixed only by the action of the column pin. Although it can prevent the snare rope from escaping from the groove body, the snare rope may move, causing the thulium cutter to move and deviate from the central axis of the snare rope, thereby causing the thulium cutter to be unable to be accommodated in the main body; second, the snare rope is fixed only by the action of the column pin, which will cause poor contact between the snare rope and the thulium cutter, affecting the electrical conduction, and further affecting the cutting operation of the thulium cutter. Utility Model Content

[0007] The utility model aims to provide a snare rope cutting knife to solve the problems raised in the above background technology.

[0008] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0009] The snare rope cutting knife comprises an outer sheath tube and a snare rope that can enter and exit one end of the outer sheath tube, the snare rope is connected to a thulium blade member, the thulium blade member comprises a thulium blade head and a connecting portion, and the end of the connecting portion away from the thulium blade head is concave to form a cylindrical groove;

[0010] Different from the traditional solution: the noose cutting knife further includes a cylindrical member, which is fixedly placed in the cylindrical groove, and a through hole for the noose to penetrate is also formed along the radial direction of the cylindrical member;

[0011] The advantage of such a setting is as follows: First, pass the noose through the cylindrical member, that is, hang the noose on the cylindrical member, and then insert the cylindrical member into the cylindrical groove of the connecting part. In this way, first, the noose can be prevented from detaching from the connecting part. Secondly, when the cylindrical member is inserted into the cylindrical groove, it will exert a sufficient squeezing effect on the noose, so as to ensure that the noose will not move. And with such a setting, there is sufficient contact between the noose and the cylindrical groove, ensuring good electrical conduction between the noose and the thulium knife part.

[0012] Furthermore, a long groove for accommodating the noose is recessed on the wall surface of the cylindrical member. The long groove extends along the axial direction of the cylindrical member, and one end of the long groove is connected to the through hole, and the other end extends to the end of the cylindrical member away from the thulium knife head; the function of the long groove is to accommodate the noose, ensuring sufficient contact between the noose and the cylindrical groove while preventing the cylindrical member from over-squeezing the noose and damaging the noose.

[0013] Furthermore, the cylindrical groove and the cylindrical member are connected by threads formed on both of them.

[0014] Furthermore, one end of the cylindrical member away from the thulium knife head extends outside the cylindrical groove. Since the diameter of the cylindrical member is smaller than the outer diameter of the connecting part, extending one end of the cylindrical member outside the cylindrical groove, when the thulium knife part retracts into the outer sheath tube, the end of the cylindrical member can first retract into the outer sheath tube, forming a guide for the retraction action of the entire thulium knife part.

[0015] Furthermore, the connecting part is a columnar body that can extend into the outer sheath tube and is integrally formed with the thulium knife head, that is, the connecting part can also retract into the outer sheath tube under the guidance of the cylindrical member.

[0016] Furthermore, a stop is formed on the end of the connecting part close to the thulium knife head protruding radially along the columnar body, so that the stop can abut against the end of the outer sheath tube; the stop limits the retraction length of the connecting part, that is, it ensures that the thulium knife head can be retained outside the outer sheath tube.

[0017] Furthermore, the end of the columnar body close to the noose gradually shrinks to form a chamfer, and the chamfer further serves to guide the retraction action of the cylindrical member.

[0018] Furthermore, an insulating layer is coated on the outer wall surface of the connecting part, that is, it ensures that the current only conducts to the thulium knife head, enabling the thulium knife head to act on the affected area. Brief Description of the Drawings

[0019] The accompanying drawings are used to provide a further understanding of the present utility model and form a part of the description. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the accompanying drawings:

[0020] Figure 1 is the front view of the snare wire cutter in the embodiment of the present utility model;

[0021] Figure 2 is the cross-sectional view of the snare wire and thulium knife member extending out of the outer sheath tube in the embodiment of the present utility model;

[0022] Figure 3 is the cross-sectional view of the snare wire and thulium knife member retracted into the outer sheath tube in the embodiment of the present utility model;

[0023] Figure 4 is the front view of the cylindrical member in the embodiment of the present utility model.

[0024] Outer sheath tube 1;

[0025] Snare wire 2;

[0026] Thulium knife member 3, thulium knife head 31, connecting portion 32, cylindrical groove 321, first thread 322, stop 323, chamfer 324, insulating layer 325;

[0027] Cylindrical member 4, through hole 41, long groove 42, second thread 43, extension portion 44;

[0028] Main body 5. Detailed implementation manners

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] Embodiment: This embodiment provides the best implementation scheme of the snare wire cutter, which will be specifically described in combination with Figure 1 ~ Figure 4 Specifically.

[0031] Please refer to Figure 1 , the snare wire cutter includes an outer sheath tube 1 and a snare wire 2 that can enter and exit one end of the outer sheath tube 1. A thulium knife member 3 is connected to the snare wire 2, and the thulium knife member 3 can also enter and exit one end of the outer sheath tube 1.

[0032] Please continue to refer to Figure 1, the thulium knife member 3 is in a state of being retracted into the outer sheath tube 1, and at this time, marking and cutting operations can be performed.

[0033] Please refer to the appendix Figure 2 , when the thulium knife member 3 extends out of the outer sheath tube 1 along with the snare rope 2, snaring operations can be performed on the affected area.

[0034] Please continue to refer to the appendix Figure 1 , one end of the outer sheath tube 1 away from the snare rope 2 and the thulium knife member 3 is the main body 5 of the snare rope cutting knife. By holding the main body 5, the outer sheath tube 1 can be inserted into the intestinal tract through a gastroscope.

[0035] Please continue to refer to the appendix Figure 2 and the appendix Figure 3 , the thulium knife member 3 includes a thulium knife head 31 and a connecting portion 32. The thulium knife head 31 and the connecting portion 32 are integrally formed. Both the thulium knife head 31 and the connecting portion 32 are substantially cylindrical, and the diameter of the thulium knife head 31 is smaller than that of the connecting portion 32, so that a shoulder is formed at the connection between the thulium knife head 31 and the connecting portion 32. In this way, the thulium knife head 31 can maintain a traditional structure, and the connecting portion 32 can extend into the outer sheath tube 1.

[0036] Please continue to refer to the appendix Figure 3 , a cylindrical groove 321 is recessed at one end of the connecting portion 32 away from the thulium knife head 31. The cylindrical groove 321 is a cylindrical groove. The snare rope cutting knife further includes a cylindrical member 4. The cylindrical member 4 is a cylinder and is fixedly placed in the cylindrical groove 321. A through hole 41 for the snare rope 2 to penetrate is also formed along the radial direction of the cylindrical member 4.

[0037] Please continue to refer to the appendix Figure 3 and the appendix Figure 4 , a long groove 42 for accommodating the snare rope 2 is also recessed on the wall surface of the cylindrical member 4. The long groove 42 extends along the axial direction of the cylindrical member 4, and one end of the long groove 42 is connected to the through hole 41, and the other end extends to the end of the cylindrical member 4 away from the thulium knife head 31. In this way, the snare rope 2 can penetrate through the through hole 41. At the same time, on both sides of the through hole 41, the snare rope 2 is accommodated in the long groove 42. After the cylindrical member 4 is placed in the cylindrical groove 321, the snare rope 2 accommodated in the long groove 42 can be in close contact with the inner wall surface of the cylindrical groove 321, thereby improving the electrical conduction performance and forming a pressure on the snare rope 2 to prevent it from moving.

[0038] Please continue to refer to the appendix Figure 3 and the appendix Figure 4 , the cylindrical groove 321 and the cylindrical member 4 are connected by threads formed on both of them, that is, a first thread 322 is provided on the inner wall surface of the cylindrical groove 321, and a second thread 43 is formed on the outer wall surface of the cylindrical member 4. After the first thread 322 and the second thread 43 are tightened, the connecting portion 32 and the cylindrical member 4 can be fixedly connected.

[0039] Please continue to refer to the appendixFigure 3 and appendix Figure 4 , one end of the columnar member 4 away from the thulium cutter head 31 extends outside the columnar groove 321 to form an extension portion 44. The extension portion 44 can enter the outer sheath tube 1 prior to the connecting portion 32, and play a guiding role for the connecting portion 32.

[0040] Please continue to refer to the appendix Figure 3 , the connecting portion 32 is a columnar body that can extend into the outer sheath tube 1 and is integrally formed with the thulium cutter head 31.

[0041] Please continue to refer to the appendix Figure 3 , a stop 323 is formed on one end of the connecting portion 32 near the thulium cutter head 31 protruding along the radial direction of the columnar body. The stop 323 is an annular edge protrusion, so that the stop 323 can abut against the end of the outer sheath tube 1.

[0042] Please continue to refer to the appendix Figure 3 , one end of the columnar body near the snare rope 2 is gradually contracted to form a chamfer 324. The chamfer 324 shows a gradual contraction from the end near the stop 323 to the end away from the stop 323, which can facilitate the smooth extension of the connecting portion 32 into the outer sheath tube 1.

[0043] Please continue to refer to the appendix Figure 3 , an insulating layer 325 is coated on the outer wall surface of the connecting portion 32, that is, the current is conducted to the thulium cutter head 31 only through the inside of the connecting portion 32.

[0044] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0045] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A snare wire cutting knife, comprising an outer sheath tube and a snare wire capable of entering and exiting one end of the outer sheath tube, wherein a thulium knife member is connected to the snare wire, and is characterized in that, The thulium knife piece includes a thulium knife head and a connecting part. One end of the connecting part away from the thulium knife head is recessed to form a cylindrical groove. The snare rope cutting knife further includes a cylindrical part, and the cylindrical part is fixedly placed in the cylindrical groove. A through hole for the snare rope to penetrate is also formed along the radial direction of the cylindrical part.

2. The snare wire cutting knife according to claim 1, wherein: A long groove for accommodating the snare rope is further recessed on the wall surface of the cylindrical part. The long groove extends along the axial direction of the cylindrical part, and one end of the long groove is connected to the through hole, and the other end extends to the end of the cylindrical part away from the thulium knife head.

3. The noose rope cutting knife according to claim 1 or 2, characterized in that: The cylindrical groove and the cylindrical part are connected by threads formed on both of them.

4. The snare rope cutting knife according to claim 1 or 2, characterized in that: One end of the cylindrical part away from the thulium knife head extends outside the cylindrical groove.

5. The snare wire cutting knife according to claim 1 or 2, characterized in that: The connecting part is a columnar body that can extend into the outer sheath tube and is integrally formed with the thulium knife head.

6. The snare wire cutting knife according to claim 5, characterized in that: A stop is formed by protruding along the radial direction of the columnar body at one end of the connecting part close to the thulium knife head, so that the stop can abut against the end of the outer sheath tube.

7. The snare wire cutter according to claim 5, wherein: One end of the columnar body close to the snare rope gradually shrinks to form a chamfer.

8. The snare wire cutting knife according to claim 1 or 2, characterized in that: An insulating layer is coated on the outer wall surface of the connecting part.

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