Laparoscopic electrocoagulation hook

Abstract

This invention provides a laparoscopic electrocoagulation hook that allows for rapid and accurate adjustment of the instrument's angle during surgery, particularly in confined surgical spaces such as sphincter-preserving surgery for very low-lying rectal cancer. [Solution] The device comprises a main rod 1, a sleeve 2, a knob 3, a link rod 4, an electrocoagulation head 5, and a connecting rod 9. The sleeve is fitted around the outer circumference of the main rod so as to be axially movable by a guide structure, and the knob is connected to the main rod by a screw connection and has an annular groove on its outer circumference. The link rod is connected by sliding contact between one end of the sleeve and the annular groove at the other end. The electrocoagulation head is hinged to one end of the main rod via a hinge shaft 8, and its tail end is hinged to the sleeve via the connecting rod. When the knob is rotated, its axial movement drives the sleeve via the link rod, and the linear motion of the sleeve is converted into oscillation of the electrocoagulation head by the connecting rod, allowing for angle adjustment. This enables rapid angle adjustment during surgery.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical instruments, and particularly relates to an electrocoagulation hook for endoscopes.

Background Art

[0002] In endoscopic surgery, the electrocoagulation hook is widely used as an important surgical instrument for tissue incision and electrocoagulation hemostasis. Currently, in order to facilitate the replacement of the electrocoagulation head and the hook tip, some electrocoagulation hooks adopt a split design, and realize installation and disassembly by combining a plurality of independent parts. However, this split design greatly depends on the accurate alignment and stability between parts in actual operation, increasing the complexity of the operation procedure.

[0003] Particularly, in the anal-preserving surgery for ultra-low rectal cancer, the surgical area is located deep in the pelvis and the space is extremely narrow. Therefore, in order for the surgeon to adapt to fine dissection operations according to the tissue state, frequent adjustment and replacement of instruments are required. The design drawbacks of the split electrocoagulation hook become prominent in such scenarios, which may lead to a significant extension of the operation time. Also, more stable instrument control is required to avoid damaging the surrounding tissues during the hemostasis process, imposing higher requirements on the operation accuracy. This complexity not only increases the burden on the surgical team but also potentially raises the surgical risk.

[0004] Therefore, it is necessary to optimize the structure of the electrocoagulation hook to effectively improve the surgical efficiency and operation accuracy, and ensure the smoothness and safety in scenarios such as anal-preserving surgery for ultra-low rectal cancer.

Summary of the Invention

Problems to be Solved by the Invention

[0005] In response to the above problems of the prior art, the present invention provides an electrocoagulation hook for endoscopes.

Means for Solving the Problems

[0006] The technical solution adopted in this invention is as follows: The electrocoagulation hook for the endoscope includes a main rod, a sleeve, a knob, a link rod, an electrocoagulation head, and a connecting rod. The sleeve is fitted to the outer circumference of the main rod so as to be movable along the axial direction, and a guide engagement structure is provided between the sleeve and the main rod to restrict the circumferential rotation of the sleeve. The knob is connected to the main rod by a screw connection and has an annular groove on its outer circumference. One end of the link rod is connected to the sleeve, and the other end forms sliding contact with the annular groove. The electrocoagulation head is hinged to one end of the main rod via a hinge shaft. One end of the connecting rod is hinged to the tail of the electrocoagulation head, and the other end is hinged to the sleeve.

[0007] When the knob rotates, it moves axially along the main rod by screw motion, causing the sleeve to move axially via the link rod, and the sleeve adjusts the angle by rotating the electrocoagulation head around the hinge axis via the connecting rod.

[0008] Specifically, the guide engagement structure includes a guide groove and a guide projection, the guide groove being provided on the inner wall of the sleeve and extending in the axial direction of the main rod, and the guide projection being fixedly installed on the outer wall of the main rod and fitted into the guide groove.

[0009] Furthermore, the aforementioned link rods are two rods that are installed symmetrically.

[0010] Specifically, the other end of the link rod has a projection that fits into the annular groove to form sliding contact.

[0011] Furthermore, the working end of the electrocoagulation head is curved in an arc shape.

[0012] Specifically, a through hole is provided in the center of the knob, an internal thread is provided on the inner wall of the through hole, and an external thread that matches the internal thread is provided at the end of the main rod, and the knob is connected to the main rod by the combination of the internal and external threads. [Effects of the Invention]

[0013] This invention enables flexible adjustment of the angle of the electrocoagulation head, avoiding the complex assembly and disassembly processes of conventional split-type designs. Its ingenious design features are as follows: 1. The combination of guide grooves and guide projections between the sleeve and the main rod ensures axial movement of the sleeve. 2. Two symmetrically positioned link rods have one end connected to the sleeve and the other end fitted into an annular groove provided in the knob to form sliding contact. The knob is connected to the main rod by a screw mechanism. When the knob rotates, the characteristics of screw motion are used to achieve forward and backward movement. Furthermore, because one end of the link rod is fitted into the annular groove by the projection, the link rod does not rotate with the rotation of the knob, but is driven forward and backward by the knob, thereby moving the sleeve forward and backward. In this way, the slider-crank mechanism (link mechanism) composed of the sleeve, connecting rod, and electrocoagulation head reliably converts the linear motion of the sleeve into rotational motion (oscillation) around the hinge axis of the electrocoagulation head. By combining this with fine feed control via a knob screw, precise control of the working angle of the electrocoagulation head is achieved.

[0014] Therefore, although it does not offer the convenience of quickly replacing the electrocoagulation head or hook tip as with a split-type electrocoagulation hook, this invention solves the problem that conventional split-type electrocoagulation hooks are unsuitable in some situations. In particular, it can be applied to situations where the angle of the instrument needs to be frequently adjusted, such as in sphincter-preserving surgery for very low-lying rectal cancer, and strongly supports the smooth progress of the surgery. [Brief explanation of the drawing]

[0015] [Figure 1] Figure 1 shows the overall configuration of the present invention. [Figure 2] Figure 2 is a cross-sectional view of a partial structure of the present invention. [Figure 3] Figure 3 shows the structure of the sleeve according to the present invention. [Figure 4] Figure 4 shows the planar fitting relationship between the link rod and the annular groove according to the present invention. [Modes for carrying out the invention]

[0016] This invention provides a type of electrocoagulation hook for a dental endoscopic examination, the structure of which is shown in Figures 1 to 4, and includes a main rod 1, a sleeve 2, a knob 3, an electrocoagulation head 5, a guide groove 6, a guide projection 7, a hinge shaft 8, and a connecting rod 9. These components, through specific connecting relationships and combinations, enable flexible adjustment of the angle of the electrocoagulation head.

[0017] The main rod 1 is the primary support structure for the electrocoagulation hook for the endoscope and has an elongated cylindrical shape. The sleeve 2 is fitted around the outer circumference of the main rod 1 so as to be movable along the axial direction, and a combination structure of a guide groove 6 and a guide projection 7 is provided between the inner wall of the sleeve 2 and the outer wall of the main rod 1 (see Figures 2 and 3). The guide groove 6 is provided on the inner wall of the sleeve 2 and extends in the axial direction of the main rod 1. The guide projection 7 is fixedly installed on the outer wall of the main rod 1 and is fitted into the guide groove 6. The combination of the guide groove 6 and the guide projection 7 ensures that the sleeve 2 moves only in the axial direction of the main rod 1, and link rods 4 are provided on both sides of the sleeve 2.

[0018] A through hole is provided in the center of the knob 3, and an internal thread is provided on the inner wall of the through hole. An external thread that matches this internal thread is provided at the end of the main rod 1, and the knob 3 is connected to the main rod 1 by a screw connection. Anti-slip grooves are provided on the outer circumference of the knob 3 to facilitate gripping and rotation by the operator. An annular groove 10 is provided in the knob 3, and one end of each of the two link rods has a projection 11 fitted into the annular groove 10, forming sliding contact with the annular groove 10 (see Figures 2 and 4). When the knob 3 rotates, the knob 3 moves axially along the main rod 1 due to the action of the screw connection. At this time, due to the design of the annular groove 10 and projection 11, the link rod 4 does not rotate along with the rotation of the knob 3. In this way, when the knob 3 moves forward by rotation, one side wall of the annular groove 10 pushes the projection 11 (transmission of thrust), and the link rod 4 advances the sleeve 2 along the axial direction of the main rod 1. As the knob 3 moves backward by rotation, the other side wall of the annular groove 10 pulls on the projection 11 (transmission of tensile force), causing the link rod 4 to retract the sleeve 2 along the axial direction of the main rod 1. Thus, the combination design of the annular groove 10 and the projection 11 enables bidirectional pushing and pulling motion of the link rod 4. To further optimize the feel of operation, a low-friction lubricating coating (such as Teflon® coating or diamond-like carbon coating) can be applied to the sliding contact surfaces of the annular groove 10 and / or projection 11. This coating effectively reduces sliding friction resistance, making angle adjustment smoother and more precise.

[0019] The electrocoagulation head 5 is hinged to one end of the main rod 1 via a hinge shaft 8, allowing the electrocoagulation head 5 to rotate around the hinge shaft 8. One end of the connecting rod 9 is hinged to the tail end of the electrocoagulation head 5, and the other end is hinged to the sleeve 2. The working end of the electrocoagulation head 5 is curved in an arc, and its curvature angle can be adjusted as needed for the surgery. The angle change of the electrocoagulation head 5 is achieved by driving the connecting rod 9 through the axial movement of the sleeve 2, and the amount of movement of the sleeve 2 is converted into the rotation angle of the electrocoagulation head 5 around the hinge shaft 8 via the connecting rod 9.

[0020] During use, the operator rotates the knob 3, moving it axially along the main rod 1. This movement is transmitted to the sleeve 2 via the link rod 4, causing the sleeve 2 to move axially. The axial movement of the sleeve 2 is transmitted to the tail end of the electrocoagulation head 5 via the connecting rod 9. Since the electrocoagulation head 5 is hinged to the main rod 1 via the hinge shaft 8, the pushing and pulling action of the connecting rod 9 on the tail end of the electrocoagulation head 5 rotates the electrocoagulation head 5 around the hinge shaft 8, thereby changing the angle of the working end. By controlling the direction of rotation and the amount of movement of the knob 3, the angle of the electrocoagulation head 5 can be precisely adjusted. For example, rotating the knob 3 clockwise moves it towards the electrocoagulation head 5 along the main rod 1. At this time, since the projection 11 at the end of the link rod 4 is inside the annular groove 10, the axial movement of the knob 3 moves the link rod 4 in the axial direction, and subsequently pushes the sleeve 2 along the main rod 1 in the same direction via the link rod 4. The movement of the sleeve 2 pushes the tail of the electrocoagulation head 5 via the connecting rod 9, rotating the electrocoagulation head 5 downward around the hinge axis 8 and increasing the angle. Conversely, when the knob 3 is rotated counterclockwise, it moves along the main rod 1 away from the electrocoagulation head 5, pulling the sleeve 2 back along the main rod 1 in the same direction via the link rod 4. The movement of the sleeve 2 pulls the tail of the electrocoagulation head 5 via the connecting rod 9, rotating the electrocoagulation head 5 upward around the hinge axis 8 and decreasing the angle.

[0021] In the present invention, the fitting structure of the guide groove 6 and the guide projection 7 between the sleeve 2 and the main rod 1, and the fitting in which the link rod 4 fits the projection 11 into the annular groove 10 to form a sliding contact play an important role. The guide groove 6 extends in the axial direction of the main rod 1, the guide projection 7 is fitted into the guide groove 6, ensuring that the sleeve 2 moves only in the axial direction of the main rod 1. On the other hand, the design of the annular groove 10 and the projection 11 ensures that the link rod 4 does not rotate as the knob 3 rotates, but moves in the same direction as the knob 3 moves forward and backward, thereby enabling the sleeve 2 on the main rod 1 to move forward and backward. And through the slider-crank mechanism composed of the sleeve 2, the connecting rod 9, and the electrocoagulation head 5, the linear motion of the sleeve 2 is reliably converted into a rotational motion (oscillation) centered on the hinge axis 8 of the electrocoagulation head 5. By combining with the fine feed by the screw of the knob, the precise control of the working angle of the electrocoagulation head is jointly realized.

[0022] To further illustrate the usage scenario of the present invention, an ultra-low rectal cancer anal preservation surgery is taken as an example. During this surgical process, in order to adapt to different anatomical structures and operation requirements, the doctor needs to frequently adjust the angle of the electrocoagulation head 5. The conventional split-type electrocoagulation hook often requires a complicated assembly and disassembly process when adjusting the angle, which takes a long time and is inconvenient to operate. On the other hand, the present invention realizes the rapid adjustment of the angle of the electrocoagulation head 5 through a simple mechanical structure. The doctor can complete the angle adjustment through the above-mentioned transmission mechanism just by rotating the knob 3, without the need for additional tools or procedures, significantly shortening the instrument adjustment time and improving the surgical efficiency. At the same time, since the overall structure of the present invention is simple and easy to manufacture, it reduces the production cost and the difficulty of maintenance.

[0023] Through the above specific embodiments, the present invention shows its structural composition, connection relationship and operating principle. The main rod 1 serves as the core supporting component. The sleeve 2 realizes stable axial movement through the cooperation of the guide groove 6 and the guide protrusion 7. The knob 3 converts the rotational movement into the axial movement of the sleeve 2 through screw connection and the link rod 4. The axial movement of the sleeve 2 is finally converted into the angle adjustment of the electrocoagulation head 5 through the connecting rod 9 and the hinge shaft 8. The connection relationship between each component is clear, the operation process is intuitive, and it can meet the requirements for the flexibility and stability of the instrument during the surgical process.

[0024] The following further explains the specific implementation principle of the present invention in combination with specific application scenarios.

[0025] In the anal-preserving surgery for ultra-low rectal cancer, the doctor needs to perform incision and hemostasis operations on tissues at different angles through the electrocoagulation hook for laparoscopy. First, the doctor inserts the main rod 1 of the electrocoagulation hook for laparoscopy into the laparoscope channel and adjusts the angle of the electrocoagulation head 5 according to the surgical requirements. During the adjustment process, the doctor rotates the knob 3 installed at the end of the main rod 1. The outer circumference of the knob 3 is provided with anti-slip grooves, which facilitates the gripping operation. The internal thread thereof is aligned with the external thread at the end of the main rod 1, enabling the knob 3 to move axially along the main rod 1 when it rotates. When the knob 3 is rotated clockwise, it moves in the direction approaching the electrocoagulation head 5 along the main rod 1. Conversely, when rotated counterclockwise, it moves in the direction away from the electrocoagulation head 5. The axial movement of the knob 3 is transmitted to the sleeve 2 through the link rod 4. As the knob 3 moves, the link rod 4 smoothly moves the sleeve 2 along the axial direction of the main rod 1.

[0026] [[ID=

[0027] For example, when sleeve 2 moves towards the working end of electrocoagulation head 5, the connecting rod 9 pushes the tail of electrocoagulation head 5, rotating the working end downward and increasing the angle. Conversely, when sleeve 2 moves away from the working end of electrocoagulation head 5, the connecting rod 9 pulls the tail of electrocoagulation head 5, rotating the working end upward and decreasing the angle. By controlling the direction and amount of rotation of knob 3, the physician can adjust the angle of electrocoagulation head 5 to adapt to the requirements of the surgery. [Explanation of Symbols]

[0028] 1 main rod 2 sleeves 3 Knobs 4 Link Rods 5. Electrocoagulation head 6 Guide groove 7 Guide protrusions 8 Hinge axes 9 connecting rod 10 Annular groove 11 Protrusions

Claims

1. An electrocoagulation hook for laparoscopy, The main rod, A sleeve is fitted to the outer circumference of the main rod so as to be movable along the axial direction, A knob screw-connected to the main rod, A link rod connecting the sleeve and the knob, An electrocoagulation head is hinged to one end of the main rod via a hinge shaft, The system includes a connecting rod that connects the sleeve and the tail portion of the electrocoagulation head, A guide engagement structure is provided between the sleeve and the main rod to restrict the circumferential rotation of the sleeve. An annular groove is provided on the outer circumference of the knob. One end of the link rod is connected to the sleeve, and the other end forms sliding contact with the annular groove. One end of the connecting rod is hinged to the tail portion of the electrocoagulation head, and the other end is hinged to the sleeve. An electrocoagulation hook for a dental endoscopic examination, characterized in that when the knob rotates, it moves axially along the main rod by the screw coupling, moves the sleeve axially via the link rod, and the sleeve rotates the electrocoagulation head around the hinge axis via the connecting rod to adjust the angle.

2. The aforementioned guide engagement structure A guide groove is provided on the inner wall of the sleeve and extends in the axial direction of the main rod, The electrocoagulation hook for a cathoscope according to claim 1, further comprising a guide projection fixedly installed on the outer wall of the main rod and fitted into the guide groove.

3. The electrocoagulation hook for a dental microscope according to claim 2, characterized in that the other end of the link rod has a projection that fits into the annular groove to form sliding contact with the annular groove.

4. The electrocoagulation hook for cauteroscopy according to claim 3, characterized in that the working end of the electrocoagulation head is curved in an arc shape.

5. A through hole is provided in the center of the knob. An internal screw is provided on the inner wall of the through hole. An external thread is provided at the end of the main rod, which is aligned with the internal thread. The electrocoagulation hook for cauteroscopy according to claim 4, characterized in that the knob is connected to the main rod by a combination of the internal thread and the external thread.

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