Tungsten alloy electrocoagulation hook preparation process

Abstract

The invention aims at disclosing a tungsten alloy electrocoagulation hook preparation process, and relates to the technical field of electrocoagulation hook preparation, the tungsten alloy electrocoagulation hook preparation process comprises the following steps: S1, preparing a tungsten alloy rod with the diameter of 0.8-10 mm; s2, the end, with the length ranging from 3 mm to 10 mm, of the tungsten alloy bar is machined into a first cylinder with the cross section in a water drop shape; s3, putting the first column body and the second column body into a quartz container with a reducing atmosphere, and heating the first column body to 350-680 DEG C; s4, in the quartz container, the boundary of the first cylinder and the second cylinder serves as a bending point, the first cylinder is bent by 60-160 degrees, and a hook body is formed. The method has the beneficial effects that the first cylinder is heated to 350-680 DEG C in the quartz container at the heating speed of 25-50 DEG C / min, then the first cylinder is bent by 60-160 degrees, and the hook body is formed. In the heating and bending process, positive pressure is kept in the quartz container, oxygen in the quartz container is extruded out through the reducing atmosphere, it is ensured that the first column body cannot be oxidized, the first column body is bent at the high temperature, and the brittleness is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electrocoagulation hook preparation, and in particular to a tungsten alloy electrocoagulation hook preparation process. Background Art

[0002] The electrocoagulation hook is a medical device used in electrocoagulation surgery, which is mainly used to melt or destroy tissues through electrical energy to achieve the purpose of hemostasis, cutting or removing tissues. It has the characteristics of simple structure, easy operation, good coagulation effect, etc., and is widely used in surgical operations.

[0003] At present, the material of the electrocoagulation hook is mainly stainless steel with a circular cross-section. The toughness and cutting efficiency of stainless steel are low. Tungsten alloy has more outstanding toughness, but tungsten alloy is more brittle and difficult to bend into an electrocoagulation hook.

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

[0005] The purpose of the invention is to disclose a preparation process of a tungsten alloy electrocoagulation hook.

[0006] To achieve the above-mentioned purpose, the present invention provides a tungsten alloy electrocoagulation hook preparation process, comprising the following steps:

[0007] S1: preparing a tungsten alloy rod with a diameter of 0.8 mm to 10 mm, wherein the cross section of the tungsten alloy rod is circular;

[0008] S2: The end of the tungsten alloy rod with a length of 3mm-10mm is processed into a first cylinder with a teardrop-shaped cross-section, and the rest is a second cylinder, wherein the first cylinder includes a first arc surface, a first defect surface, a second defect surface and a second arc surface, and the arc of the first arc surface is 0°-30°, and the arc of the first arc surface is smaller than that of the second arc surface;

[0009] S3: placing the first column and the second column in a quartz container in a reducing atmosphere, and heating the first column to 350°C-680°C at a heating rate of 25°C / min-50°C / min, wherein the air pressure in the quartz container is 1.03 times-1.05 times the external air pressure;

[0010] S4: In the quartz container, taking the boundary between the first column and the second column as the bending point, bend the first column by 60°-160° to form a hook body, with the first arc surface facing the second column;

[0011] S5: cooling the bent hook body to room temperature in the quartz container;

[0012] S6: taking out the cooled hook body for polishing.

[0013] Preferably, the length of the first curved surface is 2 mm-10 mm.

[0014] Preferably, 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 defect surface is a curved surface or an inclined surface, and the second defect surface is a curved surface or an inclined surface.

[0015] Preferably, in step S6, the polishing is electrochemical polishing, and the electrochemical polishing is performed according to the following steps:

[0016] S61: preparing a polishing liquid from NaOH, KOH and deionized water, the polishing liquid being placed in a transparent container, wherein the content of NaOH is 25wt%, and the content of KOH is 20wt%-25wt%;

[0017] S62: placing the cooled hook body into a polishing liquid;

[0018] S63: using the hook body as the anode and the palladium-zinc-silver alloy as the cathode, using a high-precision constant voltage and constant current power supply, the polishing liquid temperature is constant at 26° C., the power-on time is 120s-200s, the power-on current is 0.8A-1.5A, and the power-on voltage is 4V-7V;

[0019] S64: Continuously stirring the polishing liquid to polish the surface of the hook body to 0.01 μm-0.4 μm.

[0020] Preferably, the quartz container is provided with an air inlet and an air outlet, and a mixed gas of 95% nitrogen and 5% hydrogen by volume is continuously filled into the quartz container from the air inlet, and excess gas is continuously extracted from the air outlet, and the air intake speed of the air inlet is slightly greater than the air extraction speed of the air outlet.

[0021] Preferably, a bending assembly is arranged in the quartz container.

[0022] Preferably, the bending assembly comprises a base, a first bending column, a second bending column and a bending plate, a plurality of first semicircular grooves are arranged on the surface of the first bending column, and a plurality of second semicircular grooves are arranged on the surface of the second bending column;

[0023] A defective portion is provided in the middle of the base, the first bending column is rotatably provided on one side of the defective portion, and the second bending column is rotatably provided on the other side of the defective portion;

[0024] The bending plate has a built-in electromagnetic heating unit, and the cross-section of the lower end of the bending plate is semicircular.

[0025] Preferably, the first column is placed in the first semicircular groove, and the second arc surface faces the first semicircular groove.

[0026] Preferably, in step S3, the bending plate descends to a first position and contacts a boundary between the first column and the second column, and the electromagnetic heating unit is started to heat the temperature of the boundary to 350°C-680°C.

[0027] Preferably, in step S4, the bending plate descends to a second position to bend the boundary by 60°-160°.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The present invention heats the first column to 350°C-680°C at a heating rate of 25°C / min-50°C / min in a quartz container, and then bends the first column by 60°-160°. During the heating and bending process, the pressure of the reducing atmosphere in the quartz container is 1.03 times-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 will not be oxidized. In addition, the first column is bent at this high temperature, which greatly reduces its brittleness, thereby achieving a 60°-160° bending of the first column.

[0030] (2) The first cylinder is the electrocoagulation working part. The first defect surface and the second defect surface are formed on the first cylinder by cutting or grinding. The first defect surface and the second defect surface are symmetrically arranged on both sides of the axial 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 and long 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 and long 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The figure is a process flow chart of the preparation of the tungsten alloy electrocoagulation hook of the present invention.

[0032] Figure 2 It is a side view of the unbent first column and the second column of the present invention.

[0033] Figure 3 It is a side view of the first column and the second column after bending of the present invention.

[0034] Figure 4 For the present invention Figure 2 or Figure 3 Schematic diagram of the cross-sectional view at AA.

[0035] Figure 5 For the present invention Figure 2 or Figure 3 Schematic diagram of the cross-section at AA.

[0036] Figure 6 This is a schematic diagram of the bending assembly of the present invention.

[0037] Figure 7 It is a top view schematic diagram of the first bending column or the second bending column of the present invention.

[0038] Among them, 1. first cylinder; 11. first arc surface; 12. first defective surface; 13. second defective surface; 14. second arc surface; 15. end face; 2. second cylinder; 3. quartz container; 31. air inlet; 32. air outlet; 4. bending assembly; 41. base; 42. first bending column; 421. first semicircular groove; 43. second bending column; 431. second semicircular groove; 44. bending plate; 45. first tension spring; 46. second tension spring; 47. defective part; 5. bending point. DETAILED DESCRIPTION

[0039] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] Example 1

[0042] This embodiment discloses a tungsten alloy electrocoagulation hook preparation process. Figures 1 to 7 As shown, the following steps are included:

[0043] 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, and the rest is tungsten. This kind of tungsten alloy has the characteristics of high strength and high toughness. When used as an electrocoagulation hook, it has a long service life and high tissue cutting efficiency.

[0044] S2: The end of the 3mm-10mm length of the tungsten alloy rod is processed into a teardrop-shaped cross section (see Figure 2 , Figure 4 and Figure 5 ) is a first cylinder 1, and the rest is a second cylinder 2, the first cylinder 1 includes a first curved surface 11, a first defective surface 12, a second defective surface 13 and a second curved surface 14, the curvature of the first curved surface 11 is 0°-30°, and the curvature of the first curved surface 11 is smaller than the curvature of the second curved 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 cylinder 1 is 0.8mm-3mm, and the first cylinder 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, and the curvature b of the first arc surface 11 is 0°-30°. The curvature of the first arc surface 11 is smaller than the curvature of the second arc surface 14, and the first arc surface 11 forms a narrow and long cutting surface. Compared with the traditional electrocoagulation hook, the first arc surface 11 of this embodiment is narrow and long, especially when the curvature of the first arc surface 11 is 0°-10°, such as 0° to form a sharp blade, the cutting electric energy is more concentrated on the narrow and long first arc surface 11, which greatly improves the cutting efficiency of the electrocoagulation hook; in this step, the end face 15 of the first cylinder 1 is rounded, which can prevent the sharp edge of the end face 15 from directly scratching the organs and blood vessels, and the rounded end face 15 is convenient for blunt separation of tissues during surgery and easy insertion into tissue gaps.

[0045] S3: Place the first column 1 and the second column 2 in a quartz container 3 with a reducing atmosphere, and heat the first column 1 to 350°C-680°C at a heating rate of 25°C / min-50°C / min, and the air pressure in the quartz container 3 is 1.03 times-1.05 times the external air pressure; specifically, when the first column 1 and the second column 2 are heated to between 350°C-680°C, the brittleness of the tungsten alloy is greatly reduced, which helps it to bend and is not easy to break. If it is in an environment with oxygen, it will be rapidly oxidized and can no longer be used as an electrocoagulation hook. For this reason, see Figure 6 and Figure 7The quartz container 3 is provided with an air inlet 31 and an air outlet 32, and a mixed gas of 95% nitrogen and 5% hydrogen by volume is continuously filled into the quartz container 3 from the air inlet 31, and excess gas is continuously extracted from the air outlet 32. The air intake speed of the air inlet 31 is slightly greater than the air extraction speed of the air outlet 32 ​​to ensure that the inside of the quartz container 3 is positive pressure, and the reducing atmosphere squeezes out the oxygen in the quartz container 3 and ensures that the first column 1 and the second column 2 will not be oxidized after heating; in view of the fact that tungsten alloy has a certain thermal expansion coefficient, and a heating speed that is too fast will cause excessive expansion of the tungsten alloy, for this reason, a heating speed of 25℃ / min-50℃ / min is selected.

[0046] S4: In 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 60°-160° to form a hook body, and the first arc surface 11 faces the second column 2; specifically, the angle a between the first column 1 and the second column 2 is 60°-160°, and 90° is preferred in this embodiment.

[0047] S5: The bent hook body is cooled to room temperature in the quartz container 3 .

[0048] S6: taking out the cooled hook body and polishing it; specifically, the polishing is electrochemical polishing, and the electrochemical polishing is performed according to the following steps:

[0049] S61: preparing a polishing liquid from NaOH, KOH and deionized water, the polishing liquid being placed in a transparent container, wherein the content of NaOH is 25wt%, and the content of KOH is 20wt%-25wt%;

[0050] S62: placing the cooled hook body into a polishing liquid;

[0051] S63: using the hook body as the anode and the palladium-zinc-silver alloy as the cathode, using a high-precision constant voltage and constant current power supply, the polishing liquid temperature is constant at 26° C., the power-on time is 120s-200s, the power-on current is 0.8A-1.5A, and the power-on voltage is 4V-7V;

[0052] S64: Continuously stir the polishing liquid to polish the surface of the hook body to 0.01μm-0.4μm. The smaller the surface roughness, the less likely the first column 1 surface is to adhere to the tissue, and the less thermal damage. Through steps S61 to S64, the hook body is electropolished using a polishing liquid prepared from NaOH, KOH and deionized water. The polishing liquid uses a strong alkali as an electrolyte. The polishing liquid has a stable composition and low cost. It can achieve the roughness of the hook body surface polished to 0.01μm-0.4μm, so that the hook body surface has a high finish. When cutting tissue, it has the advantages of fast speed, sharpness and non-adhesion; when the polishing liquid temperature is constant at 26°C, palladium zinc silver alloy is used as the cathode. The cathode has the characteristics 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, when the polishing liquid composition is stable, it can ensure that the surface finish of each batch of polished tungsten electrodes is consistent, and the product quality is high.

[0053] Step S3 and step S4 are both completed in the quartz container 3, in which a bending assembly 4 is arranged, the bending assembly 4 comprising a base 41, a first bending column 42, a second bending column 43 and a bending plate 44, a plurality of first semicircular grooves 421 are arranged on the surface of the first bending column 42, a plurality of second semicircular grooves 431 are arranged on the surface of the second bending column 43, the first bending column 42 and the second bending column 43 are parallel, a first tension spring 45 is arranged between the end of the first bending column 42 and the base 41, a second tension spring 46 is arranged between the end of the second bending column 43 and the base 41; a defective portion 47 is arranged in the middle of the base 41, and the first bending column 42 is rotatably arranged on one side of the defective portion 47 , the second bending column 43 is rotatably arranged on the other side of the defective portion 47; the bending plate 44 has a built-in electromagnetic heating unit, and the cross-section of the lower end of the bending plate 44 is semicircular, and the lower end of the semicircle can make the bending point 5 form an arc bend, and the bending plate 44 is in a vertical state and aligned with the defective portion 47; in step S3, the first column 1 is placed in the first semicircular groove 421, and the second arc surface 12 faces the first semicircular groove 421, the first arc surface 11 faces the bending plate 44, and the second column 2 is placed in the second semicircular groove 431, the boundary between the first column 1 and the second column 2 is the bending point, and the bending point is aligned with the bending plate 44, and the bending plate 44 is lowered to the first position ( Figure 6 The first column 1 and the second column 2 are paused at the dotted line X) and contact the boundary between the first column 1 and the second column 2, and the electromagnetic heating unit is started to heat the temperature of the boundary to 350°C-680°C, and the heating rate is 25°C / min-50°C / min; the number of the first semicircular groove 421 and the second semicircular groove 431 are both multiple, such as three respectively, so that three can be heated at one time to form three hook bodies at one time; after the heating is completed, in step S4, the bending plate 44 descends to the second position ( Figure 6The boundary is bent by 60°-160°. After bending, the hook will rebound by a certain angle, such as 5°-10°. Therefore, the bending angle in step S4 is 5°-10° larger than the final target bending angle.

[0054] During the process of the bending plate 44 descending from the first position to the second position, the first column 1 presses down the first semicircular groove 421 and drives the first bending column 42 to rotate, and the first tension spring 45 is stretched; synchronously, the second column 2 presses down the second semicircular groove 431 and drives the second bending column 43 to rotate, and the second tension spring 46 is stretched. In this process, since the first bending column 42 and the second bending column 43 follow the movement, 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, the damage to the surface of the first column 1 and the second column 2 is small, which is beneficial to the subsequent polishing operation; after the bending is completed, the first tension spring 45 drives the first bending column 42 to return, and the second tension spring 46 drives the second bending column 43 to return.

[0055] See also Figure 4 and Figure 5 , the first defect surface 12 and the second defect surface 13 are symmetrically arranged on both sides of the axial section L of the hook body, the first defect surface 12 is a curved surface or a slope, and the second defect surface 13 is a curved surface or a slope; in addition, the curvature b of the first curved surface 11 is smaller than or much smaller than the curvature of the second curved surface 14, and the curvature c of the second curved surface 14 is preferably 90°-180°. When cutting is not required, the first defect surface 12, the second defect surface 13 and the second curved surface 14 can be used as hemostatic surfaces. The first defect surface 12, the second defect surface 13 and the second curved surface 14 occupy the vast majority of the second cylinder 2. The electrocoagulation hook of this embodiment maintains the hemostatic function while improving the cutting efficiency; the first defect surface 12 is a curved surface or a slope, and the second defect surface 13 is a curved surface or a slope, and the slope refers to Figure 3 ; See Figure 5 When the first defect surface 12 and the second defect surface 13 are both arc surfaces, the radius of the first defect surface 12 and the second defect surface 13 is much larger than the radius of the first arc surface 11. At this time, the surface area of ​​the first defect surface 12 and the second defect surface 13 is larger, ensuring the hemostasis area.

Claims

1. The preparation process of tungsten alloy electrocoagulation hook is characterized by: The following steps are involved: S1: preparing a tungsten alloy rod with a diameter of 0.8 mm to 10 mm, wherein the cross section of the tungsten alloy rod is circular; S2: The end of the tungsten alloy rod with a length of 3mm-10mm is processed into a first cylinder with a teardrop-shaped cross-section, and the rest is a second cylinder, wherein the first cylinder includes a first arc surface, a first defect surface, a second defect surface and a second arc surface, and the arc of the first arc surface is 0°-30°, and the arc of the first arc surface is smaller than that of the second arc surface; S3: placing the first column and the second column in a quartz container in a reducing atmosphere, and heating the first column to 350°C-680°C at a heating rate of 25°C / min-50°C / min, wherein the air pressure in the quartz container is 1.03 times-1.05 times the external air pressure; S4: In the quartz container, taking the boundary between the first column and the second column as the bending point, bend the first column by 60°-160° to form a hook body, with the first arc surface facing the second column; S5: cooling the bent hook body to room temperature in the quartz container; S6: taking out the cooled hook body for polishing.

2. The tungsten alloy electrocoagulation hook preparation process as claimed in claim 1, characterized in that: The length of the first curved surface is 2 mm-10 mm.

3. The tungsten alloy electrocoagulation hook preparation process as claimed 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 a curved surface or an inclined surface, and the second defective surface is a curved surface or an inclined surface.

4. The process for preparing a tungsten alloy electrocoagulation hook according to any one of claims 1 to 3, characterized in that: In step S6, the polishing is electrochemical polishing, and the electrochemical polishing is performed according to the following steps: S61: preparing a polishing liquid from NaOH, KOH and deionized water, the polishing liquid being placed in a transparent container, wherein the content of NaOH is 25wt%, and the content of KOH is 20wt%-25wt%; S62: placing the cooled hook body into a polishing liquid; S63: using the hook body as the anode and the palladium-zinc-silver alloy as the cathode, using a high-precision constant voltage and constant current power supply, the polishing liquid temperature is constant at 26° C., the power-on time is 120s-200s, the power-on current is 0.8A-1.5A, and the power-on voltage is 4V-7V; S64: Continuously stirring the polishing liquid to polish the surface of the hook body to 0.01 μm-0.4 μm.

5. The process for preparing a tungsten alloy electrocoagulation hook according to any one of claims 1 to 3, characterized in that: The quartz container is provided with an air inlet and an air outlet, and a mixed gas of 95% nitrogen and 5% hydrogen by volume is continuously filled into the quartz container from the air inlet, and excess gas is continuously extracted from the air outlet, and the air intake speed of the air inlet is slightly greater than the air extraction speed of the air outlet.

6. The process for preparing a tungsten alloy electrocoagulation hook according to any one of claims 1 to 3, characterized in that: A bending assembly is arranged in the quartz container.

7. The process for preparing the tungsten alloy electrocoagulation hook according to claim 6, characterized in that: The bending assembly includes a base, a first bending column, a second bending column and a bending plate, a surface of the first bending column is provided with a plurality of first semicircular grooves, and a surface of the second bending column is provided with a plurality of second semicircular grooves; A defective portion is provided in the middle of the base, the first bending column is rotatably provided on one side of the defective portion, and the second bending column is rotatably provided on the other side of the defective portion; The bending plate has a built-in electromagnetic heating unit, and the cross-section of the lower end of the bending plate is semicircular.

8. The process for preparing the tungsten alloy electrocoagulation hook according to 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 process for preparing the tungsten alloy electrocoagulation hook according to claim 8, characterized in that: In step S3, the bending plate descends to a first position and contacts a boundary between the first column and the second column, and the electromagnetic heating unit is started to heat the temperature of the boundary to 350°C-680°C.

10. The process for preparing the tungsten alloy electrocoagulation hook according to claim 9, characterized in that: In step S4, the bending plate descends to a second position and bends the boundary by 60°-160°.

Images