Hook knife for cutting line and tube under endoscope

Abstract

The utility model provides a bush-hook for cutting a line and a tube under an endoscope. The bush-hook comprises a blade assembly and a conveyor, the blade assembly comprises a blade and a tool apron capable of containing the blade. The conveyor comprises a bourdon tube, the knife holder connected with the far end of the bourdon tube, a handle assembly connected with the near end of the bourdon tube and a mandrel penetrating through the inside of the bourdon tube, the far end of the mandrel is connected with the blade, and the near end of the mandrel is connected with the handle assembly; and the handle assembly and the mandrel drive the blade to move axially. The bush-hook for cutting the line and the tube under the endoscope can be used for cutting not only tubes but also wires, is wide in application range, simple in structure, convenient to machine, low in cost and convenient to operate, meets clinical operation and use requirements, and improves operation efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to an endoscope cutting line and tube hook knife. Background Art

[0002] In some clinical medical applications, such as polyp ligation under digestive endoscopy and wound suturing during digestive endoscopy, when the doctor places the ligation ring in the body through the conveyor and needs to withdraw the conveyor, the conveyor and the ligation ring are not easy to be unhooked; for example, in endoscopic drainage surgery (ENBD), sometimes it is necessary to cut off the plastic catheter left in the patient's body, take out a part of it, and keep another part of the plastic catheter in the patient's body.

[0003] Currently, there are endoscopic tube cutting pliers on the market that can solve the problem of cutting plastic catheters to cut off excess tubes entering the human body during endoscopic surgery, but they are complex in structure, cumbersome to install, inconvenient to process, and high in cost. They are also inconvenient to operate and use in clinical feedback. Utility Model Content

[0004] The utility model aims to provide an endoscopic wire and tube cutting hook knife, which can not only cut tubes but also wires, has a wide range of uses, a simple structure, is easy to process, has a low cost, meets clinical operation requirements, is easy to operate, and improves surgical efficiency.

[0005] According to one aspect of the utility model, there is provided an endoscopic hook knife for cutting lines and tubes, comprising a blade assembly and a conveyor; the blade assembly comprises a blade and a blade holder in which the blade can be accommodated; the conveyor comprises a spring tube, the blade holder connected to the distal end of the spring tube, a handle assembly connected to the proximal end of the spring tube, and a core shaft passing through the interior of the spring tube, the distal end of the core shaft being connected to the blade, and the proximal end of the core shaft being connected to the handle assembly; the handle assembly and the core shaft drive the blade to move axially.

[0006] Preferably, the blade includes a knife rod and a knife head, and the knife rod is connected to the distal end of the core shaft; the knife seat includes a coaxially arranged connecting seat and a knife body seat, and the connecting seat is provided with an axially penetrating through hole, and the through hole is connected to the knife body seat, and the connecting seat is located at the proximal end of the knife body seat, and the connecting seat is connected to the distal end of the spring tube, and the handle assembly and the core shaft drive the knife head to extend out or extend into the knife body seat.

[0007] Preferably, the tool body seat is provided with a tool body groove extending in the axial direction, the tool body groove is communicated with the through hole, and the tool head extends out of or into the tool body seat through the tool body groove.

[0008] Preferably, the conveyor further comprises a connecting tube, a proximal end of the connecting tube is connected to the core shaft, and a distal end of the connecting tube is connected to the knife rod; and an outer diameter of the through hole is smaller than an outer diameter of the connecting tube.

[0009] Preferably, the cutter head is in the shape of a fishhook, and the cutter head and the through hole are axially limited.

[0010] Preferably, the knife bar and the knife head are integrally formed.

[0011] Preferably, the knife rod is provided with a protrusion, the knife head is provided with a groove matched with the protrusion, and the protrusion is fixedly connected to the groove.

[0012] Preferably, the handle assembly comprises a handle rod and a handle, the handle is sleeved on the handle rod and slidably matched with the handle rod, the core shaft passes through the handle rod and is connected to the handle, and the proximal end of the spring tube is connected to the handle rod.

[0013] Preferably, it also includes a metal tube, the proximal end of the metal tube passes through the handle rod and is connected to the handle, and the distal end of the metal tube is connected to the proximal end of the core shaft.

[0014] Preferably, it also includes a nut, which is connected to the distal end of the handle rod and is threadedly connected to the proximal end of the spring tube. The handle rod and the handle can both rotate relative to the nut, and the rotation of the spring tube drives the blade assembly to rotate.

[0015] The utility model provides an endoscopic wire and tube cutting hook knife, which can not only cut tube materials but also cut wire materials, has a wide range of uses, a simple structure, is convenient to process, has a low cost, meets clinical operation requirements, is easy to operate, and improves surgical efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the hook knife for cutting the wire and tube under endoscopy;

[0017] Figure 2 for Figure 1 A cross-sectional view of

[0018] Figure 3 This is a schematic diagram of the mandrel connection;

[0019] Figure 4 It is a schematic diagram of the connection structure between the connecting pipe and the blade assembly;

[0020] Figure 5 It is a structural schematic diagram of the knife seat;

[0021] Figure 6 This is a schematic diagram of the structure of the knife holder from another angle;

[0022] Figure 7This is a schematic diagram of the structure of the knife holder from another angle;

[0023] Figure 8 A schematic diagram of an embodiment of a blade structure. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present application, in order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application, and the preferred embodiments of the present application are given in the accompanying drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly understood. The present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the description of the present application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application. The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components.

[0027] For ease of description, in this specification, the end of the outer sheath tube along its length direction away from the operator when in use is defined as the distal end, that is, the front end, and the end held by the operator is the proximal end, that is, the rear end.

[0028] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings of the specification.

[0029] like Figure 1-3 As shown, the hook knife for cutting lines and tubes under endoscope of this embodiment comprises a blade assembly 1, a conveyor 2 and a handle assembly 3; the blade assembly 1 comprises a blade 11 and a blade holder 12 in which the blade 11 can be stored; the conveyor 2 comprises a spring tube 21, a blade holder 12 connected to the distal end of the spring tube 21, a handle assembly 3 connected to the proximal end of the spring tube 21, and a mandrel 22 running through the inside of the spring tube 21, the distal end of the mandrel 22 is connected to the blade 11, and the proximal end of the mandrel 22 is connected to the handle assembly 3; the handle assembly 3 and the mandrel 22 drive the blade 11 to move axially. Specifically, the handle assembly 3 comprises a handle rod 31 and a handle 32, the handle 32 is sleeved with the handle rod 31 and slidably cooperates with the handle rod 31, the mandrel 22 passes through the handle rod 31 and is connected to the handle 32, and the proximal end of the spring tube 21 is connected to the handle rod 31. Further specifically, it also comprises a metal tube 4, the proximal end of the metal tube 4 passes through the handle rod 31 and is connected to the handle 32, and the distal end of the metal tube 4 is connected to the proximal end of the mandrel 22. In this embodiment, the handle 32 is pushed and pulled to drive the core shaft 22 to move axially, thereby driving the blade 11 to move into the blade seat 12 or out of the blade seat 12 .

[0030] In the present embodiment, the handle assembly 3, the handle 32 is sleeved on the handle rod 31 and axially slides with the handle rod 31; the two can be locked circumferentially, so that the handle 32 can be rotated to drive the handle rod 31 to rotate. In order to facilitate the connection between the spring tube 21 and the handle rod 31, see Figure 2 As shown, in this embodiment, a nut 5 is connected to the distal end of the handle rod 31, and the nut 5 is threadedly connected to the spring tube 21, and the handle rod 31 and the handle 32 can rotate relative to the nut 5. The rotation of the handle rod 31 and the handle 32 drives the spring tube 21 to rotate, and the rotation of the spring tube 21 drives the blade assembly 1 to rotate.

[0031] like Figure 4-7As shown, specifically, the blade 11 includes a knife bar 111 and a knife head 112, and the knife bar 111 is connected to the distal end of the mandrel 22; the knife seat 12 includes a coaxially arranged connection seat 121 and a knife body seat 122, the connection seat 121 is provided with an axially penetrating through hole 1211, the knife body seat 122 is provided with an axially extending knife body groove 1221, the knife body groove 1221 is connected with the through hole 1211, the connection seat 121 is located at the proximal end of the knife body seat 122, the connection seat 121 is connected to the distal end of the spring tube 2, the handle assembly 3 and the mandrel 22 drive the knife head 112 to extend out or extend into the knife body seat 122, that is, the knife head 112 extends out or extends into the knife body seat 122 through the knife body groove 1221. Further specifically, the conveyor 2 also includes a connection tube 23, the proximal end of the connection tube 23 is connected to the mandrel 22, and the distal end of the connection tube 23 is connected to the knife bar 111; the outer diameter of the through hole 1211 is smaller than the outer diameter of the connection tube 23. Preferably, the cutter head 112 is in the shape of a fishhook, and the cutter head 112 and the through hole 1211 are axially limited. Specifically, for the convenience of processing, the knife rod 111 and the cutter head 112 are integrally formed. During operation, when the handle 32 is pushed toward the distal end, the core shaft 22 and the connecting tube 23 are driven to move toward the distal end. Because the outer diameter of the connecting tube 23 is larger than the inner diameter of the through hole 1211, when the connecting tube 23 abuts against the outer wall of the connecting seat 121 and cannot move, the operation of pushing toward the distal end is completed; when the handle 32 is pulled toward the proximal end, the core shaft 22, the connecting tube 23, the knife rod 111, and the cutter head 112 are driven to move toward the proximal end in turn. Because the cutter head 112 is in the shape of a fishhook, when the cutter head abuts against the through hole 1211 during the movement toward the proximal end and cannot move toward the proximal end again, the operation of pulling toward the proximal end is completed. This embodiment is easy to cut off the ligation ring or redundant plastic catheter inserted into the patient's body, which is convenient for normal operation of the operation.

[0032] like Figure 8 As shown, in another embodiment of the blade 11, the blade rod 111 is provided with a protrusion 1111, and the blade head 112 is provided with a groove 1121 adapted to the protrusion 1111, and the protrusion 1111 and the groove 1121 are fixedly connected, for example, by welding.

[0033] The utility model provides an endoscopic wire and tube cutting hook knife, which can not only cut tube materials but also cut wire materials, has a wide range of uses, a simple structure, is convenient to process, has a low cost, meets clinical operation requirements, is easy to operate, and improves surgical efficiency.

[0034] It will be apparent to those skilled in the art that various modifications and variations may be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention covers modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. An endoscopic cutter for cutting wires and tubes, characterized in that: The invention comprises a blade assembly (1) and a conveyor (2); the blade assembly (1) comprises a blade (11) and a blade holder (12) in which the blade (11) can be accommodated; the conveyor (2) comprises a spring tube (21), the blade holder (12) connected to the distal end of the spring tube (21), a handle assembly (3) connected to the proximal end of the spring tube (21), and a core shaft (22) penetrating the interior of the spring tube (21); the distal end of the core shaft (22) is connected to the blade (11), and the proximal end of the core shaft (22) is connected to the handle assembly (3); the handle assembly (3) and the core shaft (22) drive the blade (11) to move axially.

2. The endoscopic wire and tube hook knife as claimed in claim 1, characterized in that: The blade (11) comprises a blade rod (111) and a blade head (112), wherein the blade rod (111) is connected to the distal end of the core shaft (22); the blade seat (12) comprises a coaxially arranged connecting seat (121) and a blade body seat (122), wherein the connecting seat (121) is provided with an axially penetrating through hole (1211), wherein the through hole (1211) is communicated with the blade body seat (122), wherein the connecting seat (121) is located at the proximal end of the blade body seat (122), wherein the connecting seat (121) is connected to the distal end of the spring tube (21), and wherein the handle assembly (3) and the core shaft (22) drive the blade head (112) to extend out of or into the blade body seat (122).

3. The hook knife for cutting wires and tubes under endoscopy as claimed in claim 2, characterized in that: The blade seat (122) is provided with a blade groove (1221) extending in the axial direction, the blade groove (1221) is connected to the through hole (1211), and the blade head (112) extends out of or into the blade seat (122) through the blade groove (1221).

4. The hook knife for cutting wires and tubes under endoscopy as claimed in claim 2, characterized in that: The conveyor (2) further comprises a connecting tube (23), the proximal end of the connecting tube (23) being connected to the core shaft (22), and the distal end of the connecting tube (23) being connected to the knife rod (111); the outer diameter of the through hole (1211) is smaller than the outer diameter of the connecting tube (23).

5. The hook knife for cutting wires and tubes under endoscopy as claimed in claim 4, characterized in that: The cutter head (112) is in the shape of a fishhook, and the cutter head (112) and the through hole (1211) are axially limited.

6. The hook knife for cutting wires and tubes under endoscopy as claimed in claim 2, characterized in that: The knife rod (111) and the knife head (112) are integrally formed.

7. The hook knife for endoscopic cutting of wires and tubes as claimed in claim 2, characterized in that: The knife rod (111) is provided with a protrusion (1111), and the knife head (112) is provided with a groove (1121) adapted to the protrusion (1111), and the protrusion (1111) and the groove (1121) are fixedly connected.

8. The hook knife for cutting wires and tubes under endoscopy as claimed in claim 1, characterized in that: The handle assembly (3) comprises a handle rod (31) and a handle (32); the handle (32) is sleeved on the handle rod (31) and slidably matched with the handle rod (31); the core shaft (22) passes through the handle rod (31) and is connected to the handle (32); and the proximal end of the spring tube (21) is connected to the handle rod (31).

9. The hook knife for cutting wires and tubes under endoscopy as claimed in claim 8, characterized in that: It also comprises a metal tube (4), the proximal end of the metal tube (4) passes through the handle rod (31) and is connected to the handle (32), and the distal end of the metal tube (4) is connected to the proximal end of the core shaft (22).

10. The hook knife for cutting wires and tubes under endoscopy as claimed in claim 8, characterized in that: The invention also comprises a nut (5), wherein the nut (5) is connected to the distal end of the handle rod (31), and the nut (5) is threadedly connected to the proximal end of the spring tube (21). Both the handle rod (31) and the handle (32) can rotate relative to the nut (5), and the rotation of the spring tube (21) drives the blade assembly (1) to rotate.

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