Process for manufacturing a tungsten alloy electrocautery hook

Abstract

The application discloses a tungsten alloy electric hook manufacturing process and relates to the electric hook manufacturing technical field, and comprises the following steps: S1, preparing a tungsten alloy rod with a diameter of 0.8mm-10mm; S2, processing the end of the tungsten alloy rod with a length of 3mm-10mm into a first column body with a water-drop-shaped cross section; S3, placing the first column body and the second column body into a quartz container in a reducing atmosphere, and heating the first column body to 350 DEG C-680 DEG C; and S4, bending the first column body at the junction of the first column body and the second column body as a bending point by 60 DEG -160 DEG in the quartz container to form a hook body, and the application has the beneficial effects that the first column body is heated to 350 DEG C-680 DEG C at a heating speed of 25 DEG C / min-50 DEG C / min in the quartz container, and then the first column body is bent by 60 DEG -160 DEG, in the process of heating and bending, the quartz container maintains a positive pressure, the reducing atmosphere squeezes out oxygen in the quartz container and ensures that the first column body is not oxidized, and the first column body is also bent at the high temperature, so that the brittleness is reduced.

Description

Technical Field

[0001] This invention relates to the field of electrocoagulation hook preparation technology, and in particular to a tungsten alloy electrocoagulation hook preparation process. Background Technology

[0002] An electrocoagulation hook is a medical device used in electrocoagulation surgery. It primarily uses electrical energy to melt or destroy tissue to achieve hemostasis, cutting, or removal of tissue. It is characterized by its simple structure, ease of operation, and good hemostatic effect, and is widely used in surgical procedures.

[0003] Currently, electrocoating hooks are mainly made of stainless steel with a circular cross-section. Stainless steel has low toughness and low cutting efficiency. Tungsten alloy has more outstanding toughness, but it is brittle and difficult to bend into electrocoating hooks.

[0004] In view of this, it is necessary to develop a tungsten alloy electrocoagulation hook manufacturing process to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to disclose a process for preparing tungsten alloy electrocoagulation hooks.

[0006] To achieve the above-mentioned objectives, this invention provides a process for preparing a tungsten alloy electrocoagulation hook, comprising the following steps: S1: Prepare a tungsten alloy rod with a diameter of 0.8mm-10mm, wherein the cross-section of the tungsten alloy rod is circular; S2: The 3mm-10mm length end of the tungsten alloy rod is processed into a first column with a teardrop-shaped cross section, and the remaining part is a second column. The first column includes a first arc surface, a first defect surface, a second defect surface and a second arc surface. The arc of the first arc surface is 0°-30° and the arc of the first arc surface is smaller than the arc of the second arc surface. S3: Place the first column and the second column into a quartz container in a reducing atmosphere, and heat the first column to 350℃-680℃ at a heating rate of 25℃ / min-50℃ / min. The gas pressure inside the quartz container is 1.03-1.05 times the external gas pressure. S4: Inside the quartz container, with the boundary between the first column and the second column as the bending point, the first column is bent at 60°-160° to form a hook, with the first arc surface facing the second column; S5: The bent hook body is cooled to room temperature in the quartz container; S6: Remove the cooled hook body and polish it.

[0007] Preferably, the length of the first arc surface is 2mm-10mm.

[0008] Preferably, the first defective surface and the second defective surface are symmetrically arranged on both sides of the axial cross-section of the hook body, wherein the first defective surface is an arc surface or an inclined surface, and the second defective surface is an arc surface or an inclined surface.

[0009] Preferably, in step S6, the polishing is electrochemical polishing, which is performed according to the following steps: S61: A polishing solution prepared from NaOH, KOH, and deionized water, stored in a transparent container, wherein the NaOH content is 25wt% and the KOH content is 20wt%-25wt%. S62: Place the cooled hook body into the polishing liquid; S63: Using the hook body as the anode and the palladium-zinc-silver alloy as the cathode, a high-precision constant voltage and constant current power supply is used. The polishing liquid temperature is a constant 26℃, the energizing time is 120s-200s, the energizing current is 0.8A-1.5A, and the energizing voltage is 4V-7V. S64: Continuously stir the polishing liquid to polish the surface of the hook body to 0.01μm-0.4μm.

[0010] Preferably, the quartz container is provided with an air inlet and an air outlet. A mixture of nitrogen (95% by volume) and hydrogen (5% by volume) is continuously introduced into the quartz container through the air inlet, and excess gas is continuously extracted through the air outlet. The air inlet velocity is slightly greater than the air outlet velocity.

[0011] Preferably, a bending assembly is provided inside the quartz container.

[0012] Preferably, the bending assembly includes a base, a first bending column, a second bending column, and a bending plate. The surface of the first bending column is provided with a plurality of first semicircular grooves, and the surface of the second bending column is provided with a plurality of second semicircular grooves. The base has a defect in the middle, the first bending column is rotatably disposed on one side of the defect, and the second bending column is rotatably disposed on the other side of the defect; The bending plate has a built-in electromagnetic heating unit, and the lower end of the bending plate has a semi-circular cross-section.

[0013] Preferably, the first column is placed in the first semicircular groove, and the second arc surface faces the first semicircular groove.

[0014] Preferably, in step S3, the bending plate descends to the first position and contacts the boundary between the first column and the second column, and the electromagnetic heating unit is activated to heat the temperature at the boundary to 350℃-680℃.

[0015] Preferably, in step S4, the bending plate descends to the second position, bending the dividing point by 60°-160°.

[0016] Compared with the prior art, the beneficial effects of the present invention are: (1) In this invention, the first column is heated to 350°C-680°C in a quartz container at a heating rate of 25°C / min-50°C / min, and then the first column is bent to 60°-160°. During the heating and bending process, the pressure of the reducing atmosphere in the quartz container is 1.03-1.05 times the external pressure, that is, the quartz container maintains a positive pressure, so that the boundary between the first column and the second column is bent at 350°C-680°C. The reducing atmosphere squeezes out the oxygen in the quartz container and ensures that the first column and the second column are not oxidized. In addition, it also makes the first column bend at this high temperature, which greatly reduces its brittleness and achieves the bending of the first column to 60°-160°.

[0017] (2) The first column is the electrocoagulation working part. The first defect surface and the second defect surface are formed by cutting or grinding on the first column. The first defect surface and the second defect surface are symmetrically arranged on both sides of the axial cross section of the hook body. The first arc surface is located between the first defect surface and the second defect surface. The first arc surface forms a narrow cutting surface. Compared with the traditional electrocoagulation hook, the first arc surface of the present invention is narrow and long, and the cutting electric energy is more concentrated on the narrow first arc surface, which greatly improves the cutting efficiency of the electrocoagulation hook. In addition, when cutting is not required, the first defect surface, the second defect surface and the second arc surface can be used as hemostatic surfaces. The electrocoagulation hook prepared by the present invention maintains the hemostatic function while improving the cutting efficiency. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the manufacturing process of the tungsten alloy electrocoagulation hook of this invention.

[0019] Figure 2 This is a side view of the first and second columns of the present invention before they are bent.

[0020] Figure 3 This is a side view of the first and second columns after bending according to the present invention.

[0021] Figure 4 For the present invention Figure 2 or Figure 3 Schematic diagram of section AA.

[0022] Figure 5 For the present invention Figure 2 or Figure 3 Schematic diagram of section AA.

[0023] Figure 6 This is a schematic diagram of the bending component of the present invention.

[0024] Figure 7 This is a top view of the first or second bent column of the present invention.

[0025] Among them, 1. First column; 11. First arc surface; 12. First defective surface; 13. Second defective surface; 14. Second arc surface; 15. End face; 2. Second column; 3. Quartz container; 31. Air inlet; 32. Air outlet; 4. Bending assembly; 41. Base; 42. First bending column; 421. First semi-circular groove; 43. Second bending column; 431. Second semi-circular groove; 44. Bending plate; 45. First tension spring; 46. Second tension spring; 47. Defective part; 5. Bending point. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention. Example 1

[0028] This embodiment discloses a process for preparing a tungsten alloy electrocoagulation hook. (See also...) Figures 1 to 7 As shown, it includes the following steps: S1: Prepare a tungsten alloy rod with a diameter of 0.8mm-10mm, wherein the cross-section of the tungsten alloy rod is circular; specifically, the composition of the tungsten alloy rod is 0.5wt%-5wt% rhenium, with the remainder being tungsten. This tungsten alloy has the characteristics of high strength and high toughness, and when used as an electrocoagulation hook, it has a long service life and high efficiency in cutting tissues.

[0029] S2: The 3mm-10mm length end of the tungsten alloy rod is machined into a teardrop shape (see...). Figure 2 , Figure 4 and Figure 5The first column 1 is a second column 2, and the remaining part is a second column 2. The first column 1 includes a first arc surface 11, a first defective surface 12, a second defective surface 13, and a second arc surface 14. The arc of the first arc surface 11 is 0°-30°, and the arc of the first arc surface 11 is smaller than the arc of the second arc surface 14. Specifically, see Figure 2 , Figure 4 and Figure 5 In this embodiment, the first arc surface 11 and the second arc surface 14 are on the same circular surface. The diameter R1 of the first column 1 is 0.8mm-3mm. The first column 1 with a diameter R1 of 0.8mm is suitable for pediatric laparoscopic surgery. The length M of the first arc surface 11 is 2mm-10mm. The curvature b of the first arc surface 11 is 0°-30°. The curvature of the first arc surface 11 is smaller than that of the second arc surface 14. The first arc surface 11 forms a narrow cutting surface. Compared with the traditional electrocoagulation hook, the first arc surface 11 in this embodiment is narrow and long. In particular, when the curvature of the first arc surface 11 is 0°-10°, such as 0° forming a sharp blade, the cutting electrical energy is more concentrated on the narrow first arc surface 11, which greatly improves the cutting efficiency of the electrocoagulation hook. In this step, the end face 15 of the first column 1 is rounded to avoid the sharp edge of the end face 15 directly scratching the internal organs and blood vessels. The rounded end face 15 facilitates blunt dissection of tissue during surgery and easy insertion into the interstitial space.

[0030] S3: Place the first column 1 and the second column 2 into a quartz container 3 with a reducing atmosphere, and heat the first column 1 to 350℃-680℃ at a heating rate of 25℃ / min-50℃ / min. The gas pressure inside the quartz container 3 is 1.03-1.05 times the external gas pressure. Specifically, when the first column 1 and the second column 2 are heated to between 350℃ and 680℃, the brittleness of the tungsten alloy decreases significantly, making it easier to bend and less prone to breakage. If it is in an oxygen-containing environment, it will be rapidly oxidized, thus rendering it unusable as an electrocoating hook. For this reason, see [reference needed]. Figure 6 and Figure 7 The quartz container 3 is provided with an inlet 31 and an outlet 32. A mixture of nitrogen (95% by volume) and hydrogen (5% by volume) is continuously introduced into the quartz container 3 through the inlet 31, and excess gas is continuously extracted through the outlet 32. The inlet speed of the inlet 31 is slightly greater than the extraction speed of the outlet 32 ​​to ensure that the inside of the quartz container 3 is under positive pressure. The reducing atmosphere displaces the oxygen in the quartz container 3 and ensures that the first column 1 and the second column 2 are not oxidized after heating. Since tungsten alloy has a certain coefficient of thermal expansion, and excessive heating speed will cause excessive expansion of tungsten alloy, a heating speed of 25℃ / min-50℃ / min is selected.

[0031] S4: Inside the quartz container 3, with the boundary between the first column 1 and the second column 2 as the bending point, the first column 1 is bent at 60°-160° to form a hook, and the first arc surface 11 faces the second column 2; specifically, the included angle α between the first column 1 and the second column 2 is 60°-160°, and in this embodiment, 90° is preferred.

[0032] S5: The bent hook is cooled to room temperature in the quartz container 3.

[0033] S6: Remove the cooled hook body and polish it; specifically, the polishing is electrochemical polishing, which is performed according to the following steps: S61: A polishing solution prepared from NaOH, KOH, and deionized water, stored in a transparent container, wherein the NaOH content is 25wt% and the KOH content is 20wt%-25wt%. S62: Place the cooled hook body into the polishing liquid; S63: Using the hook body as the anode and the palladium-zinc-silver alloy as the cathode, a high-precision constant voltage and constant current power supply is used. The polishing liquid temperature is a constant 26℃, the energizing time is 120s-200s, the energizing current is 0.8A-1.5A, and the energizing voltage is 4V-7V. S64: The polishing slurry is continuously stirred to polish the surface of the hook to 0.01μm-0.4μm. The smaller the surface roughness, the less likely tissue will adhere to the surface of the first column 1, resulting in less thermal damage. Through steps S61 to S64, the hook is electropolished using a polishing slurry prepared from NaOH, KOH, and deionized water. The polishing slurry uses a strong alkali as the electrolyte, and its composition is stable and low-cost. It can polish the surface roughness of the hook to 0.01μm-0.4μm, giving the hook surface a high degree of smoothness. When cutting tissue, it has the advantages of fast speed, sharpness, and non-stickiness. The polishing slurry temperature is kept constant at 26℃, and a palladium-zinc-silver alloy is used as the cathode. This cathode has the characteristic of not being corroded even after long-term use, making the cathode stable. A high-precision constant voltage and constant current power supply is used, and the voltage and current can be stably controlled. At the same time, with the stable composition of the polishing slurry, the surface smoothness of the tungsten electrode polished in each batch can be guaranteed to be consistent, resulting in high product quality.

[0034] Steps S3 and S4 are both completed within the quartz container 3. A bending assembly 4 is installed within the quartz container 3. The bending assembly 4 includes a base 41, a first bending post 42, a second bending post 43, and a bending plate 44. The surface of the first bending post 42 has several first semi-circular grooves 421, and the surface of the second bending post 43 has several second semi-circular grooves 431. The first bending post 42 and the second bending post 43 are parallel. A first tension spring 45 is installed between the end of the first bending post 42 and the base 41, and a second tension spring 46 is installed between the end of the second bending post 43 and the base 41. A defect 47 is provided in the middle of the base 41, and the first bending post 42 is rotatably mounted on one side of the defect 47. The second bending column 43 is rotatably disposed on the other side of the defect 47; the bending plate 44 has a built-in electromagnetic heating unit, and the lower end of the bending plate 44 has a semi-circular cross-section. The lower end of the semi-circular cross-section allows the bending point 5 to form an arc bend. The bending plate 44 is in a vertical state and aligned with the defect 47; in step S3, the first column 1 is placed in the first semi-circular groove 421, and the second arc surface 12 faces the first semi-circular groove 421, the first arc surface 11 faces the bending plate 44, the second column 2 is placed in the second semi-circular groove 431, the boundary between the first column 1 and the second column 2 is the bending point, the bending point is aligned with the bending plate 44, and the bending plate 44 is lowered to the first position ( Figure 6 (At the dotted line X) pause and contact the boundary between the first column 1 and the second column 2, and start the electromagnetic heating unit to heat the temperature at the boundary to 350℃-680℃ at a heating rate of 25℃ / min-50℃ / min; there are multiple first semicircular grooves 421 and second semicircular grooves 431, such as three of each, so that three can be heated at once to form three hooks at once; after heating is completed, in step S4, the bending plate 44 descends to the second position ( Figure 6 (At the dotted line Y), bend the dividing point by 60°-160°. After bending, the hook will spring back at a certain angle, such as 5°-10°. Therefore, the bending angle in step S4 should be 5°-10° larger than the final target bending angle.

[0035] During the process of bending plate 44 descending from the first position to the second position, the first column 1 presses down on the first semicircular groove 421 and drives the first bending column 42 to rotate, and the first tension spring 45 is stretched; simultaneously, the second column 2 presses down on the second semicircular groove 431 and drives the second bending column 43 to rotate, and the second tension spring 46 is stretched. During this process, since the first bending column 42 and the second bending column 43 move together, the friction between the first column 1 and the first semicircular groove 421 is small, and the friction between the second column 2 and the second semicircular groove 431 is small, resulting in less damage to the surfaces of the first column 1 and the second column 2, which is beneficial for subsequent polishing operations; after bending is completed, the first tension spring 45 drives the first bending column 42 to return to its original position, and the second tension spring 46 drives the second bending column 43 to return to its original position.

[0036] See Figure 4 and Figure 5 The first defective surface 12 and the second defective surface 13 are symmetrically arranged on both sides of the axial cross-section L of the hook body. The first defective surface 12 is an arc surface or a slope, and the second defective surface 13 is an arc surface or a slope. In addition, the arc b of the first arc surface 11 is less than or much less than the arc of the second arc surface 14, and the arc c of the second arc surface 14 is preferably 90°-180°. When cutting is not required, the first defective surface 12, the second defective surface 13, and the second arc surface 14 can be used as hemostatic surfaces. The first defective surface 12, the second defective surface 13, and the second arc surface 14 occupy most of the second column 2. The electrocoagulation hook of this embodiment improves cutting efficiency while maintaining hemostatic function. The first defective surface 12 is an arc surface or a slope, and the second defective surface 13 is an arc surface or a slope. See the section on slope. Figure 3 See also Figure 5 When both the first defect surface 12 and the second defect surface 13 are curved surfaces, the radii of the first defect surface 12 and the second defect surface 13 are much larger than the radius of the first curved surface 11. At this time, the surface area of ​​the first defect surface 12 and the second defect surface 13 is larger, which ensures the hemostasis area.

Claims

1. A process for manufacturing tungsten alloy electrocoagulation hooks, characterized in that, Includes the following steps: S1: Prepare a tungsten alloy rod with a diameter of 0.8mm-10mm, wherein the cross-section of the tungsten alloy rod is circular; S2: The 3mm-10mm length end of the tungsten alloy rod is processed into a first column with a teardrop-shaped cross section, and the remaining part is a second column. The first column includes a first arc surface, a first defect surface, a second defect surface and a second arc surface. The arc of the first arc surface is 0-π / 6rad and the arc of the first arc surface is smaller than the arc of the second arc surface. S3: Place the first column and the second column into a quartz container in a reducing atmosphere, and heat the first column to 350℃-680℃ at a heating rate of 25℃ / min-50℃ / min. The gas pressure inside the quartz container is 1.03-1.05 times the external gas pressure. S4: Inside the quartz container, with the boundary between the first column and the second column as the bending point, the first column is bent at 60°-160° to form a hook, with the first arc surface facing the second column; S5: The bent hook body is cooled to room temperature in the quartz container; S6: Remove the cooled hook body and polish it.

2. The tungsten alloy electrocoagulation hook manufacturing process as described in claim 1, characterized in that, The length of the first arc surface is 2mm-10mm.

3. The tungsten alloy electrocoagulation hook manufacturing process as described in claim 1, characterized in that, The first defective surface and the second defective surface are symmetrically arranged on both sides of the axial cross-section of the hook body. The first defective surface is an arc surface or an inclined surface, and the second defective surface is an arc surface or an inclined surface.

4. The tungsten alloy electrocoagulation hook preparation process according to any one of claims 1-3, characterized in that, In step S6, the polishing is electrochemical polishing, which is performed according to the following steps: S61: A polishing solution prepared from NaOH, KOH, and deionized water, stored in a transparent container, wherein the NaOH content is 25wt% and the KOH content is 20wt%-25wt%. S62: Place the cooled hook body into the polishing liquid; S63: Using the hook body as the anode and the palladium-zinc-silver alloy as the cathode, a high-precision constant voltage and constant current power supply is used. The polishing liquid temperature is a constant 26℃, the energizing time is 120s-200s, the energizing current is 0.8A-1.5A, and the energizing voltage is 4V-7V. S64: Continuously stir the polishing liquid to polish the surface of the hook body to 0.01μm-0.4μm.

5. The tungsten alloy electrocoagulation hook manufacturing process according to any one of claims 1-3, characterized in that, The quartz container is provided with an air inlet and an air outlet. A mixture of nitrogen (95% by volume) and hydrogen (5% by volume) is continuously introduced into the quartz container through the air inlet, and excess gas is continuously extracted through the air outlet. The air inlet velocity is slightly greater than the air outlet velocity.

6. The manufacturing process of the tungsten alloy electrocoagulation hook as described in any one of claims 1-3, characterized in that, A bending assembly is provided inside the quartz container.

7. The tungsten alloy electrocoagulation hook manufacturing process as described in claim 6, characterized in that, The bending assembly includes a base, a first bending column, a second bending column, and a bending plate. The surface of the first bending column is provided with a plurality of first semi-circular grooves, and the surface of the second bending column is provided with a plurality of second semi-circular grooves. The base has a defect in the middle, the first bending column is rotatably disposed on one side of the defect, and the second bending column is rotatably disposed on the other side of the defect; The bending plate has a built-in electromagnetic heating unit, and the lower end of the bending plate has a semi-circular cross-section.

8. The tungsten alloy electrocoagulation hook manufacturing process as described in claim 7, characterized in that, The first column is placed in the first semicircular groove, and the second arc surface faces the first semicircular groove.

9. The tungsten alloy electrocoagulation hook manufacturing process as described in claim 8, characterized in that, In step S3, the bending plate descends to the first position and contacts the boundary between the first column and the second column, and the electromagnetic heating unit is activated to heat the temperature at the boundary to 350℃-680℃.

10. The tungsten alloy electrocoagulation hook manufacturing process as described in claim 9, characterized in that, In step S4, the bending plate descends to the second position, bending the dividing point by 60°-160°.

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