A high-frequency sphincterotomy knife with dilation function

Abstract

This invention discloses a high-frequency sphincterotomy knife with expansion function. By incorporating a deployable expansion component at the front end of a traditional high-frequency sphincterotomy knife, the device can appropriately expand narrow channels before tissue incision, effectively increasing the endoscopic field of view and providing a larger operating space. This allows doctors to more clearly observe diseased tissue and surrounding structures, thereby improving the accuracy of the incision operation. Simultaneously, the expansion claw, driven by a slider, can achieve controllable extension and retraction, allowing the expansion range to be adjusted according to actual surgical needs. The positioning guide post ensures the stability of the expansion claw during movement, preventing displacement or interference of the expansion structure. Furthermore, the ball-head structure at the front end of the expansion claw reduces the risk of damage to the inner wall of the channel during expansion, thus improving the safety and reliability of the surgical operation and demonstrating good clinical application value.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, specifically, it relates to a high-frequency sphincter cutter with dilation function. Background Technology

[0002] With the development of endoscopic minimally invasive treatment techniques, endoscopic sphincterotomy (EST) has become an important surgical procedure for treating common bile duct stones, biliary obstruction, and certain pancreatobiliary diseases. During this type of surgery, a high-frequency sphincterotomy knife is typically used to enter the duodenal papilla through the endoscope's working channel. A high-frequency current drives a cutting wire to cut the sphincter tissue, thereby achieving drainage and unblocking of the bile duct or pancreatic duct. Current sphincterotomy knives typically include an outer tube, a handle, and a cutting wire structure at the front end. The surgeon controls the extension length of the cutting wire through the handle and uses a high-frequency power source to complete the tissue cutting operation.

[0003] However, in actual surgical procedures, due to the narrow anatomical structure of the duodenal papilla region and the distal bile duct, and the limited space of surrounding tissues, traditional high-frequency sphincterotomies often can only complete the incision within a relatively confined space after entering the surgical site. This can easily restrict the surgical field of view, thus affecting the surgeon's observation and assessment of the diseased tissue. Furthermore, performing the incision directly in a confined space may increase the risk of accidental cutting or damage to surrounding tissues, compromising the safety and stability of the surgical procedure.

[0004] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0005] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal cross-sectional structure of the cutting wire. Figure 3 A schematic diagram of the unfolded cross-sectional structure of the end of a sphincter cutter; Figure 4 A schematic diagram of the contraction section of a sphincter cutter. Figure 5 This is a schematic diagram of the cross-sectional structure of the end of a sphincter cutter during use.

[0006] The attached diagram lists the components represented by each number as follows: 1. Cutting wire; 2. Expanding claw; 3. Positioning guide post; 4. Outer tube; 5. Injection handle; 6. Sliding block; 7. Handle; 8. Slip ring.

[0007] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0008] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that this embodiment is only used to explain the technical principles of the present invention and is not intended to limit the scope of protection of the present invention. Without departing from the technical concept of the present invention, those skilled in the art can make various changes or equivalent substitutions to its structural form or connection method, and all such changes or substitutions should fall within the scope of protection of the present invention.

[0009] As shown in the figure, this invention provides a high-frequency sphincter cutter with dilation function, comprising an outer tube 4, a handle 7, and cutting and dilation components disposed at the front end of the outer tube 4. The outer tube 4 is a slender tubular structure, its overall shape matching the working channel of the endoscope, allowing it to enter the human digestive tract through the instrument channel of the endoscope. The outer tube 4 can be made of medical-grade stainless steel or high-polymer medical materials, with a smooth outer surface to reduce friction during movement within human tissue, thereby improving the safety and comfort of the operation. The rear end of the outer tube 4 is fixedly connected to the handle 7, which serves as the operating component for the doctor to hold and control the movement of the various structures of the device.

[0010] A cutting wire 1 is axially arranged inside the outer tube 4. The cutting wire 1 is a conductive metal wire structure, and its material can be a medical alloy or a highly conductive metal material to ensure good cutting performance under high-frequency electrical stimulation. The front end of the cutting wire 1 extends to the front end of the outer tube 4, while its rear end passes through the inside of the handle 7 and connects to the slip ring 8. The slip ring 8 is located on the outer surface of the handle 7 and can slide along the axial direction of the handle 7. When the operator pushes the slip ring 8 forward, the slip ring 8 moves the cutting wire 1 towards the front end of the outer tube 4, causing the cutting wire 1 to extend from the front end of the outer tube 4; when the slip ring 8 slides backward, the cutting wire 1 retracts into the outer tube 4. By adjusting the position of the slip ring 8, the extension length of the cutting wire 1 can be precisely controlled, allowing the surgeon to adjust the depth of tissue incision according to the needs of the surgery.

[0011] In practical use, the cutting wire 1 can be connected to an external high-frequency power supply. When the cutting wire 1 is energized, a high-frequency current is generated on its surface, which can perform high-frequency electrical cutting on the tissue upon contact, and at the same time has a certain hemostatic effect. Therefore, by controlling the position of the slip ring 8 and the on / off state of the high-frequency current, precise cutting of the sphincter tissue can be achieved.

[0012] To provide the doctor with a better field of vision and more operating space before the incision, an expansion component is provided at the front end of the outer tube 4. The expansion component includes multiple expansion claws 2, which are evenly distributed along the circumferential direction of the outer tube 4 and form a deployable expansion structure around the front end of the outer tube 4. In this embodiment, four expansion claws 2 are preferably provided, evenly arranged along the circumferential direction to form a four-claw expansion structure. This structural design allows for a more uniform expansion force during expansion, ensuring that the expansion force acts evenly on the inner wall of the tube, thereby improving the stability of the expansion.

[0013] To ensure the stability of the expanding claws 2 during movement, a positioning guide post 3 is provided at the center of the expanding assembly. The positioning guide post 3 is fixedly positioned at the center of the front end of the outer tube 4, and multiple expanding claws 2 are arranged around the positioning guide post 3. The positioning guide post 3 guides and limits the expanding claws 2, ensuring a stable movement trajectory during extension and retraction, thus preventing the expanding claws 2 from deviating or interfering with each other during movement. Simultaneously, the guiding effect of the positioning guide post 3 also allows the expanding claws 2 to form a more regular expanding shape when unfolded, thereby improving the expansion effect.

[0014] The dilator claw 2 is connected to the slider 6 mounted on the handle 7 via a transmission structure. The slider 6 is located on the outer surface of the handle 7 and can slide along the axial direction of the handle 7. The slider 6 and the dilator claw 2 are connected by an internal linkage or transmission mechanism. When the operator pushes the slider 6 forward, the slider 6 drives the dilator claw 2 to move forward along the axial direction of the outer tube 4 via the transmission mechanism, causing the dilator claw 2 to gradually extend from the front end of the outer tube 4. When the dilator claw 2 extends to a certain position, it gradually opens outward under the guidance of the structure, thus forming a trumpet-shaped dilation structure. By adjusting the position of the slider 6, the extension length and dilation angle of the dilator claw 2 can be controlled, thereby adjusting the dilation range according to different surgical sites.

[0015] To reduce damage to the inner wall of the tube during expansion, a ball-shaped structure is provided at the front end of the expansion claw 2. The ball-shaped structure has a smooth surface that acts as a buffer when in contact with tissue during expansion, making the contact between the expansion claw 2 and the tissue smoother, thus effectively reducing the risk of damage to normal tissue. At the same time, the ball-shaped structure also serves as a guide, making it easier for the expansion claw 2 to enter narrow channels.

[0016] In addition, an injection handle 5 is provided on the handle 7, which is connected to the inside of the outer tube 4 through an internal channel. During the operation, the doctor can inject saline or other medical fluids into the surgical area by operating the injection handle 5, thereby rinsing or assisting in the dilation of the surgical area. The injection operation can effectively improve the visual environment of the surgical area, allowing the endoscope to observe the tissue structure of the surgical site more clearly, thereby improving the accuracy of the surgical operation.

[0017] In practical use, the doctor first inserts the high-frequency sphincterotomy knife of this invention into the working channel of the endoscope, and then inserts the tip of the outer tube 4 into the human digestive tract. When the device reaches the site requiring surgery, such as the duodenal papilla or the end of the bile duct, the slider 6 is first pushed, causing the dilator claw 2 to gradually extend from the tip of the outer tube 4 and expand outward, thereby dilating the narrow duct area. This dilation operation increases the field of view of the endoscope and provides more operating space for subsequent incision operations.

[0018] Once sufficient observation space is available in the surgical area, the surgeon pushes the slip ring 8, allowing the cutting wire 1 to extend from the front end of the outer tube 4 to the target tissue location. Under the influence of a high-frequency power supply, the sphincter tissue is then cut. By controlling the position of the slip ring 8, the cutting depth can be precisely controlled, thus avoiding unnecessary damage to surrounding tissues. After cutting, the slip ring 8 can be slid backward, causing the cutting wire 1 to retract into the outer tube 4. Simultaneously, the slider 6 is moved backward, retracting the dilator claw 2 into the outer tube 4, thus completing the entire surgical procedure.

[0019] Through the above structural design, this invention integrates the expansion component and the cutting component into the same device, and uses the slider 6 and slip ring 8 for independent control. This allows the surgeon to first expand the narrow space before performing tissue incision, thereby effectively improving the surgical field of vision and operating space. Simultaneously, the ball-head structure at the front end of the expansion claw 2 effectively reduces the risk of damage to the inner wall of the channel, making the device safer and more reliable in clinical use. Furthermore, the injection handle 5 can also provide flushing or auxiliary expansion functions during surgery, further improving the success rate and safety of the procedure.

[0020] It should be noted that, without departing from the technical concept of this invention, those skilled in the art can make appropriate adjustments to the number of expansion claws, the expansion structure, or the driving method. For example, the number of expansion claws can be set to three or more. As long as the expansion effect on the pipe space can be achieved, it falls within the protection scope of this invention.

Claims

1. A high-frequency sphincter cutter with dilation function, characterized in that, Includes a handle (7), on which a slip ring (8) and a slider (6) are provided, and one end of the handle (7) is connected to an injection handle (5) for injection during surgery; The end of the injection handle (5) away from the handle (7) is connected to an outer tube (4). The outer tube (4) is equipped with a cutting wire (1). The rear end of the cutting wire (1) is connected to a slip ring (8). The cutting wire (1) is extended or retracted by sliding along the handle (7) through the slip ring (8). An expansion component is provided at the front end of the outer tube (4). The expansion component includes multiple expansion claws (2), which are distributed circumferentially along the outer tube (4) to form a trumpet-shaped structure. The expansion claw (2) is connected to the slider (6). The expansion claw (2) is extended or retracted by sliding the slider (6) along the handle (7) axially, thereby adjusting the expansion range inside the pipe. The expansion component is provided with a positioning guide post (3) at its center, which is used to guide and position the expansion claw (2).

2. The high-frequency sphincter cutter with dilation function according to claim 1, characterized in that, The expansion claws (2) are configured as four, and the four expansion claws (2) are evenly distributed along the circumference of the outer tube (4) to form a four-claw expansion structure.

3. The high-frequency sphincter cutter with dilation function according to claim 1, characterized in that, The front end of the expansion claw (2) is provided with a ball head structure, which is used to reduce damage to the inner wall of the pipe during expansion.

4. The high-frequency sphincter cutter with dilation function according to claim 1, characterized in that, The positioning guide post (3) is located at the center of the front end of the outer tube (4), and multiple expansion claws (2) are arranged around the positioning guide post (3).

5. A high-frequency sphincter cutter with dilation function according to claim 1, characterized in that, The expansion claw (2) is retracted inside the front end of the outer tube (4) when it is not extended, and extends outward under the push of the slider (6) to form a trumpet-shaped expansion structure.

6. A high-frequency sphincter cutter with dilation function according to claim 1, characterized in that, The slider (6) is mounted on the handle (7) and can slide along the axial direction of the handle (7) to independently control the extension length of the expansion claw (2), thereby adjusting the expansion range.

7. A high-frequency sphincter cutter with dilation function according to claim 1, characterized in that, The slip ring (8) is mounted on the handle (7) and can slide along the axial direction of the handle (7). The slip ring (8) drives the cutting wire (1) to extend or retract, thereby controlling the cutting depth.

8. A high-frequency sphincter cutter with dilation function according to claim 1, characterized in that, The cutting wire (1) is used to perform high-frequency electric cutting on the tissue under energized conditions, thereby achieving tissue cutting and hemostasis.

9. A high-frequency sphincter cutter with dilation function according to claim 1, characterized in that, The cutting wire (1) and the expansion claw (2) adopt an independent control structure, so that the expansion component and the cutting component can be operated separately.

Images