Electrochemical machining device for complex nail groove structure on surface of endoscope anastomat nail anvil

Abstract

The present application relates to a kind of complex nail groove structure electrolytic processing device of endoscope anastomat nail anvil surface, including tool cathode unit and workpiece anode unit;Tool cathode unit includes liquid inlet and tool cathode, tool cathode is equipped with the liquid passage groove that is penetrated from top to bottom and is located the array boss structure of lower surface, electrolyte flows from liquid inlet, after tool cathode liquid passage groove, it flows to the processing area below tool cathode, tool cathode is connected power negative pole;Workpiece anode unit includes workpiece, fixture main body, positioning device, electricity guide device, the upper surface of workpiece is processed the array nail groove structure corresponding with array boss structure by the feed movement of cathode;The upper surface of fixture main body is equipped with installation groove, workpiece is installed in installation groove, the both sides of installation groove are equipped with flow channel groove respectively.The electrolytic processing device of the present application applies electrolytic processing to the processing of large-area nail groove of nail anvil surface, so as to obtain the array groove structure with high processing efficiency and good quality.

Description

Technical Field

[0001] This invention relates to the fields of electrolytic machining and medical devices, and in particular to an electrolytic machining apparatus for a complex groove structure on the surface of a laparoscopic anvil. Background Technology

[0002] Laparoscopic staplers are mainly used for the cutting, removal, and anastomosis of tissues in minimally invasive surgical procedures (also known as laparoscopic surgery) for diseases of organs such as the esophagus, stomach, intestines, appendix, gallbladder, and pancreas. Compared with open surgical staplers, laparoscopic staplers are smaller, easier to operate, and allow cutting and anastomosis to be performed simultaneously, which can effectively shorten the operation time, reduce blood loss, and thus improve the quality of surgery.

[0003] The anvil is a key component of laparoscopic staplers, playing a crucial role in surgery. Its processing quality directly affects the cutting and suturing effects on tissues. Currently, staple grooves are typically processed using cold extrusion (imprinting). There has been some research on anvil manufacturing in China. Dong Zhaoyuan and Wu Weimin have invented and disclosed an anvil, its manufacturing method, and a stapler with the anvil (CN201410411154.X), achieving the purpose of creating staple grooves on the anvil surface through stamping. Zhang Zuren has invented and disclosed a method for processing an anvil with staple forming grooves in a surgical stapler (CN200710048008.5), employing a combination of non-ferrous alloy die casting and electroplating to achieve higher processing efficiency, better quality, and lower cost. However, due to the objective gap between domestic and international advanced levels in terms of the mechanical properties of selectable materials, mold processing capabilities, and precision cold extrusion manufacturing technology, the quality and precision of domestically produced staplers have defects, and the technology needs further improvement.

[0004] Electrolytic machining (EMC) is a part processing method based on the principle of electrochemical anodic dissolution. This method offers advantages such as no mechanical cutting force, high processing efficiency, and good processing quality, making it suitable for machining arrayed groove structures. Nanjing University of Aeronautics and Astronautics has invented and disclosed a continuous EMC device for strip-shaped workpieces with multiple groove structures (CN202011244848.0), achieving continuous machining of strip-shaped workpieces with multiple groove structures. However, currently, EMC is not applied to the machining of large-area groove structures on anvil surfaces in China, indicating that the technology is not yet mature and there is still a significant gap between its application and actual production processing of grooves. Summary of the Invention

[0005] To address the shortcomings of existing mechanical imprinting of staple grooves and the technical problems of poor product accuracy and low pass rate, this invention provides an electrolytic machining device for complex staple groove structures on the surface of the anvil of a laparoscopic stapler.

[0006] The specific content of the present invention is as follows: an electrolytic machining device for complex nail groove structure on the surface of an anvil of a laparoscopic stapler, comprising a tool cathode unit and a workpiece anode unit;

[0007] The tool cathode unit includes an inlet liquid and a tool cathode. The tool cathode has a liquid passage channel that runs vertically through the bottom and an array of protrusions on its lower surface. Electrolyte flows in from the inlet liquid, passes through the liquid passage channel of the tool cathode, and flows to the processing area below the tool cathode. The tool cathode is connected to the negative terminal of the power supply.

[0008] The workpiece anode unit includes a workpiece, a fixture body, a positioning device, and an electric current drawing device. The upper surface of the workpiece is machined with an array of nail grooves corresponding to the array boss structure through cathode feed. The upper surface of the fixture body is provided with a mounting groove, in which the workpiece is placed. Flow channel grooves are provided on both sides of the mounting groove. The positioning device fixes the workpiece in the mounting groove. The electric current drawing device is connected to the positive terminal of the power supply to draw electricity to the workpiece.

[0009] Furthermore, the interior of the liquid inlet is a hollow cavity with an inlet on the side and an outlet at the bottom, which is connected to the tool cathode; the top of the liquid inlet is equipped with an installation structure that can be positioned and clamped onto the machine tool spindle.

[0010] Furthermore, the liquid passage of the tool cathode is elongated and its length is greater than the effective length of the required machining boss.

[0011] Furthermore, the mounting groove of the fixture body has an arc-shaped cross-section, which corresponds to the arc-shaped bottom cross-section of the workpiece.

[0012] Furthermore, the positioning device includes a positioning long end cover plate and two short end cover plates on both sides. The fixture body has a long end groove along the length of the workpiece. The positioning long end cover plate is set at one end of the long end groove, and a positioning step is set at its tail. The positioning step is stuck on the side edge of the long end groove, and the positioning long end cover plate is pressed against the surface of the workpiece. The two short end cover plates are respectively set above the flow channel groove, forming a flat flow channel with the flow channel groove.

[0013] Furthermore, the power-leading device is a power-leading long end cover plate, which is set at the other end of the long end groove. The power-leading long end cover plate is provided with a threaded hole, and a power-leading screw is installed in the threaded hole. The power-leading screw is connected to the positive terminal of the power supply.

[0014] Furthermore, it also includes a liquid outlet, which is located on both sides of the fixture body. The liquid outlet includes an inlet end located on the side and connected to the outlet of the flow channel, and an outlet end located on the top of the liquid outlet and perpendicular to the direction of the inlet end.

[0015] Furthermore, it also includes an electrolyte tank, which is connected to the inlet and outlet liquids. The electrolyte enters the inlet liquid from the electrolyte tank through a pressure supply pump, and the reacted electrolyte flows back to the electrolyte tank from the outlet liquid.

[0016] Furthermore, multiple fixture bodies can be interconnected to process multiple workpieces. Adjacent fixture bodies located on the inner side are connected by a bidirectional liquid outlet, with inlet ends on both sides of the bidirectional liquid outlet. The tool cathode units corresponding to the fixture bodies are installed in parallel through cathode connecting shafts and clamped on the machine tool spindle.

[0017] Furthermore, the cathode connecting shaft includes a connecting rod located below and a connecting shaft located above. The connecting rod is connected to the mounting device at the top of each liquid inlet, and the connecting shaft is located at the center of the upper surface of the connecting rod and is connected to the machine tool spindle.

[0018] With the electrolytic machining apparatus of the present invention, the electrolyte enters from the inlet liquid and then flows through the through-channel liquid channel designed in the middle of the tool cathode to the machining area. The array of nail groove structure on the top of the workpiece corresponds to the array of boss structure at the bottom of the tool cathode. As the tool cathode is continuously fed, the surface material of the workpiece undergoes local dissolution, thereby machining a groove structure on the surface of the workpiece. The reacted electrolyte flows out through the flow channels on both sides, thereby realizing the application of electrolytic machining to the machining of large-area nail grooves on the surface of the nail anvil, resulting in an array groove structure with high machining efficiency and good quality. Attached Figure Description

[0019] The specific embodiments of the present invention will be further explained below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the electrolytic machining device for the complex nail groove structure on the anvil surface of the laparoscopic anastomosis device of the present invention;

[0021] Figure 2 This is a schematic diagram of the liquid ingress method of the present invention;

[0022] Figure 3 This is a schematic diagram of the tool cathode of the present invention;

[0023] Figure 4 This is a schematic diagram of the workpiece of the present invention;

[0024] Figure 5 This is a schematic diagram of the clamp body of the present invention;

[0025] Figure 6 This is a schematic diagram of the positioning long end cover plate of the present invention;

[0026] Figure 7 This is a schematic diagram of the long end cover plate for power supply according to the present invention;

[0027] Figure 8 This is a schematic diagram of the double-sided short end cover plate of the present invention;

[0028] Figure 9 This is a schematic diagram of the double-sided liquid outlet of the present invention;

[0029] Figure 10 This is a schematic diagram of the electrolyte flow direction according to the present invention;

[0030] Figure 11 This is a schematic diagram of the cathode connection shaft used in the array processing of the present invention;

[0031] Figure 12 This is a schematic diagram of the array fabrication process of the present invention;

[0032] The components are: 1. Liquid inlet; 2. Liquid inlet port; 3. Liquid outlet port; 4. Tool cathode; 5. Array boss structure; 6. Liquid passage channel; 7. Electric current lead column; 8. Workpiece; 9. Fixture body; 10. Mounting groove; 11. Flow channel groove; 12. Positioning long end cover plate; 13. Electric current lead long end cover plate; 14. Double-sided short end cover plate; 15. Double-sided liquid outlet; 16. Liquid outlet inlet end; 17. Liquid outlet end; 18. Power supply; 19. Water pump; 20. Electrolyte tank; 21. Bidirectional liquid outlet; 22. Cathode connecting shaft. Detailed Implementation

[0033] Combination Figures 1-12 This invention provides an electrolytic machining device for complex nail groove structures on the surface of an anvil of a laparoscopic stapler, applying electrolytic machining to the machining of large-area nail grooves on the surface of the anvil. The specific structure is as follows:

[0034] like Figure 1 As shown, a device for electrolytically machining the complex nail groove structure on the surface of the anvil of a laparoscopic stapler includes a tool cathode unit and a workpiece anode unit. The tool cathode unit includes a liquid inlet 1 and a tool cathode 4. The workpiece anode unit includes a workpiece 8, a fixture body 9, a positioning long end cover plate 12 and an electric current leading long end cover plate 13, double-sided short end cover plates 14, and double-sided liquid outlet 15.

[0035] like Figure 2 As shown, the interior of the liquid inlet 1 is a hollow cavity with a liquid inlet 2 on the side and a liquid outlet 3 on the bottom. The liquid outlet 3 is connected to the top of the tool cathode 4. The upper end of the liquid inlet 1 is designed with an installation structure to connect the liquid inlet 1 to the machine tool spindle and move with it.

[0036] like Figure 3As shown, the bottom of the tool cathode 4 is used for machining, and its surface is designed with an array of boss structures 5. These bosses are used to machine the required grooves at corresponding positions on the workpiece. Non-boob areas are insulated and shielded to reduce stray corrosion. The upper end of the tool cathode 4 is flat and connects to the liquid inlet / outlet 3. Here, the liquid inlet and cathode are designed and machined separately, connected by screws and pins, with a sealing strip between them. A lead-in post 7 is located on the side of the tool cathode 4, connected to the negative terminal of the power supply. A long, vertically extending liquid-passing channel 6 is designed in the middle of the tool cathode 4, through which the electrolyte flows to the machining area. The length of the tool cathode liquid-passing channel 6 is slightly greater than the length of the area where the bosses need to be machined, ensuring sufficient electrolyte flows through the bosses to carry away the machining products and achieve consistent machining results.

[0037] like Figure 4 As shown, the back of workpiece 8 (i.e., the bottom in the figure) is consistent with the product part in an arc shape to reduce subsequent processing; an array of nail groove structure is processed on the upper surface of workpiece 8. The position of the array of nail groove structure corresponds to the array of boss structure 5 at the bottom of the tool cathode 4. During processing, the array of boss structure 5 processes and treats the nail groove structure respectively.

[0038] like Figure 5 As shown, the upper surface of the fixture body 9 is provided with a mounting groove 10 corresponding to the back of the workpiece. The mounting groove 10 is an arc-shaped groove, and the back of the workpiece 8 is located in the mounting groove 10. Flow channels 11 are designed on both sides of the mounting groove 10, and the width of the flow channels is slightly larger than the length of the machining area.

[0039] like Figure 6 As shown, the positioning long end cover 12 is plate-shaped with a positioning step at its tail, which positions the workpiece. The positioning long end cover 12 is pressed against the surface of the workpiece 8 and fixedly connected to the fixture body 9 by bolts, thus fixing the workpiece 8. The fixture body 9 has a long end groove along the length of the workpiece, and the width of the long end groove is greater than the width of the mounting groove 10. The positioning step is engaged with the side edge of the long end groove.

[0040] like Figure 7 As shown, the long end cover 13 is plate-shaped with threaded holes on its surface for mounting a current-leading screw to conduct electricity to the workpiece. In this embodiment, the threaded holes protrude from the surface of the long end cover 13. Its tail also has a positioning step. The long end cover 13 and the positioning long end cover 12 are respectively located at both ends of the long end groove, and the positioning step engages with the side edge of the long end groove. In this embodiment, the current-leading screw is a copper screw.

[0041] like Figure 8As shown, the distance between the two short end cover plates 14 is equal to the width of the tool cathode 4; the two short end cover plates 14 are installed on the upper end of the flow channel groove 11 of the fixture body by screws, forming a flat flow channel with the flow channel groove 11, through which the electrolyte after the reaction flows out.

[0042] In this preferred embodiment, the width of the fixture body 9 and the short end cover plate 14 is increased, that is, the length of the flow channel is increased, providing a longer path so that the electrolyte can reach a uniform state during the outflow process.

[0043] like Figure 9 As shown, the side of the double-sided liquid outlet 15 is the inlet end 16, and the upper end is the outlet end 17. The double-sided liquid outlet 15 is connected to both sides of the outlet of the main body of the fixture, and the liquid outlet end 17 is connected to the electrolyte tank 20. There is a 90° turn inside the liquid outlet to provide a certain back pressure, which facilitates the discharge of electrolyte.

[0044] The liquid inlet 1, positioning long end cover 12, current-leading long end cover 13, double-sided short end cover 14, and clamp body 9 are all made of insulating and corrosion-resistant materials, which not only achieves the purpose of partial insulation of the clamp but also prevents corrosion from splashed electrolyte.

[0045] In this embodiment, a power supply 18 is also included. The positive terminal of the power supply 18 is connected to the lead screw of the workpiece anode unit. The lead screw passes through the lead long end cover plate 13 and presses against the workpiece surface to transmit current to the workpiece. The negative terminal of the power supply 18 is connected to the tool cathode lead post 7 to lead the tool cathode.

[0046] In this preferred embodiment, such as Figure 1 As shown, it also includes a water pump 19 and an electrolyte tank 20; the inlet of the water pump 19 is connected to the electrolyte tank 20, and the outlet of the water pump 19 is connected to the inlet of the liquid 1; the outlets of the liquid 15 on both sides are connected to the electrolyte tank 20.

[0047] Combination Figure 10 The electrolyte enters the liquid chamber 1 from the electrolyte pool via a pressure supply pump, forming a stable flow under specific pressure. It then flows through the elongated liquid channel 6 in the center of the tool cathode 4 to the processing area. As the tool cathode 4 is continuously fed forward, the surface material of the workpiece 8 undergoes localized dissolution, thus creating a groove structure on the surface of the workpiece 8. The reacted electrolyte flows out through the channel formed by the short end cover plate 14 and the flow channel 11 of the fixture body, eventually flowing back into the electrolyte pool.

[0048] In this preferred embodiment, multiple fixture bodies 9 can be interconnected for multi-workpiece processing. For example... Figure 11 and 12As shown, adjacent fixture bodies 9 located on the inner side are connected by a bidirectional liquid outlet 21. Both sides of the bidirectional liquid outlet 21 have inlet ends. The tool cathode units corresponding to the fixture bodies are installed in parallel via cathode connecting shafts 22 and clamped onto the machine tool spindle. The cathode connecting shaft 22 includes a connecting rod located below and a connecting shaft located above. The connecting rod is connected to the mounting device at the top of each liquid inlet, and the connecting shaft is located at the center of the upper surface of the connecting rod. The connecting shaft is connected to the machine tool spindle and fixed with screws and positioned with pins to ensure positioning accuracy.

[0049] Multiple fixture bodies are connected by an improved bidirectional liquid outlet 21, allowing the electrolyte from adjacent fixture bodies 9 to flow into the same outlet after reaction. Multiple cathodes are fixedly mounted on the machine tool spindle via connecting shafts 22, enabling synchronous feeding of multiple cathodes, thus ensuring machining consistency and significantly improving machining efficiency. The machining principle remains unchanged, but the structural improvements allow for the simultaneous machining of multiple workpieces, increasing efficiency without compromising machining quality.

[0050] Many specific details have been set forth in the foregoing description to provide a thorough understanding of the present invention. However, the above description is merely a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. An electrolytic machining apparatus for complex nail groove structures on the surface of a laparoscopic stapler anvil, characterized in that: Includes tool cathode unit and workpiece anode unit; The tool cathode unit includes an inlet liquid and a tool cathode. The tool cathode has a liquid passage channel that runs vertically through the bottom and an array of protrusions on its lower surface. Electrolyte flows in from the inlet liquid, passes through the liquid passage channel of the tool cathode, and flows to the processing area below the tool cathode. The tool cathode is connected to the negative terminal of the power supply. The workpiece anode unit includes a workpiece, a fixture body, a positioning device, and an electric current introduction device. The upper surface of the workpiece is machined with an array of nail grooves corresponding to the array boss structure via cathode feed. The upper surface of the fixture body is provided with a mounting groove, in which the workpiece is placed. Flow channel grooves are provided on both sides of the mounting groove. The positioning device fixes the workpiece in the mounting groove. The electric current introduction device is connected to the positive terminal of the power supply to introduce electricity to the workpiece. The positioning device includes a positioning long end cover plate and two short end cover plates on both sides. The fixture body has a long end groove along the length of the workpiece. The positioning long end cover plate is located at one end of the long end groove, and a positioning step is provided at its tail. The positioning step is engaged with the side edge of the long end groove, and the positioning long end cover plate is pressed against the surface of the workpiece. The two short end cover plates are respectively located above the flow channel groove, forming a flat flow channel with the flow channel groove. The distance between the two short end cover plates is equal to the width of the tool cathode. The current-leading device is a long end cover plate, which is set at the other end of the long end groove. The long end cover plate has a threaded hole, and a current-leading screw is installed in the threaded hole. The bottom end of the current-leading screw is pressed against the upper surface of the workpiece and connected to the positive terminal of the power supply.

2. The electrolytic machining apparatus for complex nail groove structures on the anvil surface of a laparoscopic anastomosis device according to claim 1, characterized in that: The interior of the liquid inlet is a hollow cavity with an inlet on the side and an outlet at the bottom, which is connected to the tool cathode. The top of the liquid inlet is equipped with a mounting structure that can be positioned and clamped onto the machine tool spindle.

3. The electrolytic machining apparatus for complex nail groove structures on the anvil surface of a laparoscopic anastomosis device according to claim 1, characterized in that: The liquid passage of the tool cathode is elongated and its length is greater than the effective length of the boss to be machined.

4. The electrolytic machining apparatus for complex nail groove structures on the anvil surface of a laparoscopic anastomosis device according to claim 1, characterized in that: The mounting groove of the fixture body has an arc-shaped cross section, which corresponds to the arc-shaped bottom cross section of the workpiece.

5. The electrolytic machining apparatus for complex nail groove structures on the anvil surface of a laparoscopic anastomosis device according to claim 1, characterized in that: It also includes a liquid outlet, which is located on both sides of the fixture body. The liquid outlet includes an inlet end located on the side and connected to the outlet of the flow channel, and an outlet end located on the top of the liquid outlet and perpendicular to the direction of the inlet end.

6. The electrolytic machining apparatus for complex nail groove structures on the anvil surface of a laparoscopic anastomosis device according to claim 5, characterized in that: It also includes an electrolyte tank, which is connected to the inlet and outlet liquids. The electrolyte enters the inlet liquid from the electrolyte tank through a pressure supply pump, and the reacted electrolyte flows back to the electrolyte tank from the outlet liquid.

7. The electrolytic machining apparatus for complex nail groove structures on the anvil surface of a laparoscopic anastomosis device according to claim 5, characterized in that: Multiple fixture bodies can be interconnected to process multiple workpieces. Adjacent fixture bodies located on the inner side are connected by a bidirectional liquid outlet. Both sides of the bidirectional liquid outlet are provided with inlet ends. The tool cathode units corresponding to the fixture bodies are installed in parallel through cathode connecting shafts and clamped on the machine tool spindle.

8. The electrolytic machining apparatus for complex nail groove structures on the anvil surface of a laparoscopic anastomosis device according to claim 7, characterized in that: The cathode connecting shaft includes a connecting rod located below and a connecting shaft located above. The connecting rod is connected to the mounting device at the top of each liquid inlet, and the connecting shaft is located at the center of the upper surface of the connecting rod and is connected to the machine tool spindle.

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