High-frequency electrotome anti-adhesion gold and preparation method thereof

Abstract

The invention discloses high-frequency electrotome anti-adhesion gold and a preparation method thereof. The alloy comprises the following components in percentage by mass: 9.3-10.2% of Ni; 0.05 to 0.3 part of rare earth oxide; and the balance of Ag and inevitable impurities. The rare earth oxide comprises at least two of cerium oxide, yttrium oxide and lanthanum oxide. According to the high-frequency electrotome, due to the fact that the prepared alloy is doped with the rare earth oxide which is low in electron work function and high in melting point, the hot electron emission capacity of the high-frequency electrotome can be improved, the working temperature can be reduced, and the adhesion of tissues at the working tip can be effectively reduced. The silver-nickel alloy containing the rare earth oxide has the excellent mechanical property, the polishing property of the working tip of the high-frequency electrotome can be improved, the highly-polished needle tip can effectively reduce adhesion of tissue scorching substances in the cutting process, the adhered scorching substances can be wiped off more easily through clean gauze, and the operation is smoother and rapider.

Description

Technical Field

[0001] The invention relates to a high-frequency electric knife anti-adhesion gold. Background Art

[0002] High-frequency electrosurgical knife is an electrosurgical instrument that replaces mechanical scalpels for tissue cutting. It heats the tissue when it contacts the body through the high-frequency and high-voltage current generated by the effective electrode tip, achieving the separation and coagulation of body tissue, thereby achieving the purpose of cutting and hemostasis. Compared with traditional cold scalpels, high-frequency electrosurgical knife has better hemostasis performance and cutting effect.

[0003] The cutting and hemostasis of high-frequency electrosurgical unit are completed by electrodes, which are mainly divided into two types: monopolar and bipolar. The monopolar electrodes of high-frequency electrosurgical units are mostly made of stainless steel, which has good electrical and thermal conductivity, but there are the following problems in clinical use: blood and grease are easily accumulated on the surface of the blade. Under the high temperature of the electrosurgical unit, blood and grease are carbonized and easily accumulated on the surface of the blade. Therefore, during the operation, it is necessary to repeatedly scrape the carbon deposits on the blade with a blade, which affects the progress of the operation and wastes operation time. Surgeons often need to wipe the electrosurgical unit once every 2-3 minutes for each operation. The bipolar electrocoagulation of high-frequency electrosurgical units relies on the current between the two heads of the bipolar electrocoagulation unit to achieve blood vessel coagulation through high temperature, thereby achieving the purpose of hemostasis. However, the conductive head of the bipolar electrocoagulation unit is prone to form carbonized tissue caused by high temperature of blood and grease. Therefore, the surface of the bipolar electrocoagulation unit needs to be blood-repellent and grease-repellent, and can effectively improve the coagulation ability, thereby avoiding repeated wiping and scraping during the operation.

[0004] CN102090923A discloses a surgical device, the surface of which is treated with a CVD or PVD coating to reduce adhesion / adhesion during surgery. However, this special surface treatment step makes the entire production process more complicated and increases the cost. Summary of the invention

[0005] The object of the present invention is to provide a high-frequency electric knife anti-adhesion gold, which at least has excellent anti-adhesion performance.

[0006] According to one aspect of the present invention, a high-frequency electric knife anti-adhesion alloy is provided, and its mass percentage composition is:

[0007] Ni: 9.3-10.2; rare earth oxide: 0.05-0.3; the balance is Ag and unavoidable impurities.

[0008] According to the alloy of the present invention, the rare earth oxide preferably includes at least two of cerium oxide, yttrium oxide and lanthanum oxide.

[0009] Compared with the traditional silver-nickel alloy, the alloy of the present invention has the added specific rare earth oxide, and under the effect of its dispersion strengthening, and on the basis of not reducing the electrical and thermal conductivity of the material, the strength and mechanical properties of the silver-nickel alloy are significantly increased. When preparing a high-frequency electric knife, the working tip diameter can be significantly reduced, so that the cutting is rapid, the wound is small, fine cutting is achieved, the thermal damage area is small, the damage to healthy tissue can be effectively reduced, and the integrity of pathological tissue is protected, which is conducive to the pathological analysis of the later sectioned tissue; at the same time, the microvessels can be coagulated in a targeted manner, and the postoperative scar is small or no scar.

[0010] According to another aspect of the present invention, there is also provided a method for preparing an alloy filament for electrocoagulation tweezers, comprising:

[0011] Providing Ni powder, Ag powder and rare earth oxide powder respectively, wherein the rare earth oxide comprises at least two of cerium oxide, yttrium oxide and lanthanum oxide;

[0012] After mixing the above powders, heat to 300°C to 320°C in a hydrogen atmosphere, and keep the temperature for 20 to 40 minutes to obtain a reduced mixed powder, wherein Ni: 9.3 to 10.2 wt.%; rare earth oxide: 0.05 to 0.3 wt.%; the balance is Ag;

[0013] Pressing the reduced mixed powder into a rod-shaped alloy billet;

[0014] Vacuum sintering of alloy rods, where the sintering vacuum is less than 1*10 -2 , the sintering temperature is controlled at 1000℃~1100℃, and the sintering holding time is 2h~4h; and

[0015] Alloy filaments of corresponding sizes are obtained by hot extrusion and drawing of vacuum sintered rod-shaped alloy billets.

[0016] According to the preparation method of the present invention, the particle size of the provided Ni powder and Ag powder is preferably 15-74 μm, and the particle size of the rare earth oxide is preferably 5-10 μm.

[0017] According to the preparation method of the present invention, the powders are preferably mixed by ball milling. The ball milling process can use GCr15 steel balls as ball milling balls, and the ball-to-material ratio (mass ratio of ball milling balls to mixed powders) can be about 1:10. Using a low ball-to-material ratio is conducive to reducing damage to the powder.

[0018] According to the preparation method of the present invention, the pressing is preferably divided into two steps of cold pressing and cold isostatic pressing. The cold pressing pressure is preferably 300-450 MPa. The cold isostatic pressing pressure is preferably 300-450 MPa, and the holding time can be 50-80 s.

[0019] According to the preparation method of the present invention, the hot extrusion preferably adopts forward extrusion, and the extrusion ratio is controlled to be less than 12.

[0020] According to another aspect of the present invention, there is also provided a high-frequency electric knife, which is at least partially made of the above alloy.

[0021] The high-frequency electric knife prepared by the alloy of the present invention has a concentrated discharge site at the tip of the electrode. Under the same cutting effect, the high-frequency electric knife uses lower power than the traditional electric knife, has less thermal damage than the traditional electric knife, has less smoke during surgery, has a clearer field of vision, and has faster healing after surgery. At the same time, due to the dispersion strengthening effect of rare earth oxides, the toughness of the material is improved, making the doctor feel better when using it.

[0022] For minimally invasive tungsten needle-type high-frequency electrosurgical units, since the needle rod is made of silver-nickel alloy material containing high-melting-point and high-strength rare earth oxides, it can always maintain its sharpness during long-term large-scale surgery; even when not electrified, the electrode still has the function of provoking and separating, which can separate and lift the tissue before electrocuting or electrocoagulation, thereby achieving the purpose of accurate cutting or coagulation when power is turned on.

[0023] According to the high-frequency electric knife of the present invention, since the alloy used for preparing the high-frequency electric knife is doped with rare earth oxides with low electron work function and high melting point, the thermal electron emission capability of the high-frequency electric knife can be improved, the working temperature can be reduced, and the adhesion of tissues on the working tip can be effectively reduced. The silver-nickel alloy containing rare earth oxides of the present invention has excellent mechanical properties, and can improve the polishing property of the working tip of the high-frequency electric knife, and the highly polished needle tip can effectively reduce the adhesion of tissue scorch during the cutting process, and the adhered scorch is also easier to wipe off with clean gauze, making the operation smoother and faster. DETAILED DESCRIPTION

[0024] The present invention will be further described below by taking the preparation of alloy filaments for electrocoagulation forceps as an example.

[0025] Example 1

[0026] Mixed powder: Provide Ni powder and Ag powder with a particle size of 15 to 74 μm, and cerium oxide powder and yttrium oxide powder with a particle size of 5 to 10 μm, respectively. After mixing the above powders by ball milling for 10 minutes, heat to 310°C in a hydrogen atmosphere, keep warm for 30 minutes, and perform reduction treatment on the mixed powder. The ball milling balls used for ball milling are GCr15 steel balls, and the ball-to-material ratio is 1:10. In the reduced mixed powder: Ni: 9.5wt.%; cerium oxide: 0.05wt.%; yttrium oxide: 0.05wt.%; the balance is Ag.

[0027] Molding: The reduced mixed powder is loaded into a rod-shaped molding die for cold pressing and then further molded by cold isostatic pressing to increase density. The cold pressing pressure is 350MPa; the pressure medium of cold isostatic pressing is hydraulic oil, the molding pressure is 350MPa, and the holding time is 60s.

[0028] Sintering: Sintering in a vacuum sintering furnace to prepare a rod-shaped alloy blank (about 100 mm in diameter). The vacuum degree of vacuum hot pressing sintering is 9.2*10 -3 The sintering temperature is controlled at 1050℃ and the sintering holding time is 3h.

[0029] Extrusion and drawing: Alloy filaments of corresponding size (about 3 mm) are obtained by hot extrusion (forward extrusion, the extrusion ratio is controlled to be less than 12) and drawing.

[0030] Example 2

[0031] Mixed powder: Provide Ni powder and Ag powder with a particle size of 15 to 74 μm, and lanthanum oxide powder and yttrium oxide powder with a particle size of 5 to 10 μm, respectively. After the above powders are mixed by ball milling for 10 minutes, they are heated to 310°C in a hydrogen atmosphere and kept warm for 30 minutes to reduce the mixed powder. The ball milling balls used for ball milling are GCr15 steel balls, and the ball-to-material ratio is 1:10. In the reduced mixed powder: Ni: 10wt.%; yttrium oxide: 0.05wt.%; lanthanum oxide: 0.1wt.%; the balance is Ag.

[0032] Molding: The reduced mixed powder is loaded into a rod-shaped molding die for cold pressing and then further molded by cold isostatic pressing to increase density. The cold pressing pressure is 350MPa; the pressure medium of cold isostatic pressing is hydraulic oil, the molding pressure is 400MPa, and the holding time is 60s.

[0033] Sintering: Sintering in a vacuum sintering furnace to prepare rod-shaped alloy billets. The vacuum degree of vacuum hot pressing sintering is 9.5*10 -3 The sintering temperature is controlled at 1050℃ and the sintering holding time is 3h.

[0034] Extrusion and drawing: Alloy filaments of corresponding sizes are produced by hot extrusion and drawing.

[0035] Example 3

[0036] Mixed powder: Provide Ni powder and Ag powder with a particle size of 15 to 74 μm, and lanthanum oxide powder and cerium oxide powder with a particle size of 5 to 10 μm, respectively. After mixing the above powders by ball milling for 10 minutes, heat to 310°C in a hydrogen atmosphere, keep warm for 30 minutes, and perform reduction treatment on the mixed powder. The ball milling balls used for ball milling are GCr15 steel balls, and the ball-to-material ratio is 1:10. In the reduced mixed powder: Ni: 9.8wt.%; cerium oxide: 0.1wt.%; lanthanum oxide: 0.1wt.%; the balance is Ag.

[0037] Molding: The reduced mixed powder is loaded into a rod-shaped molding die for cold pressing and then further molded by cold isostatic pressing to increase density. The cold pressing pressure is 400MPa; the pressure medium of cold isostatic pressing is hydraulic oil, the molding pressure is 400MPa, and the holding time is 70s.

[0038] Sintering: Sintering in a vacuum sintering furnace to prepare rod-shaped alloy billets. The vacuum degree of vacuum hot pressing sintering is 9.5*10 -3 The sintering temperature is controlled at 1080℃ and the sintering holding time is 3h.

[0039] Extrusion and drawing: Alloy filaments of corresponding sizes are produced by hot extrusion and drawing.

[0040] Example 4

[0041] Mixed powder: Provide Ni powder and Ag powder with a particle size of 15 to 74 μm, and lanthanum oxide powder, yttrium oxide powder and cerium oxide powder with a particle size of 5 to 10 μm, respectively. After mixing the above powders by ball milling for 10 minutes, heat to 310°C in a hydrogen atmosphere, keep warm for 30 minutes, and perform reduction treatment on the mixed powder. The ball milling balls used for ball milling are GCr15 steel balls, and the ball-to-material ratio is 1:10. In the reduced mixed powder: Ni: 9.5wt.%; cerium oxide: 0.05wt.%; yttrium oxide: 0.05wt.%; lanthanum oxide: 0.05wt.%; the balance is Ag.

[0042] Molding: The reduced mixed powder is loaded into a rod-shaped molding die for cold pressing and then further molded by cold isostatic pressing to increase density. The cold pressing pressure is 400MPa; the pressure medium of cold isostatic pressing is hydraulic oil, the molding pressure is 350MPa, and the holding time is 70s.

[0043] Sintering: Sintering in a vacuum sintering furnace to prepare rod-shaped alloy billets. The vacuum degree of vacuum hot pressing sintering is 9.0*10 -3 The sintering temperature is controlled at 1080℃ and the sintering holding time is 3h.

[0044] Extrusion and drawing: Alloy filaments of corresponding sizes are produced by hot extrusion and drawing.

[0045] Table 1 shows the performance indicators of the alloy filaments of Examples 1-4.

[0046] Table 1

[0047] Performance Indicators Example 1 Resistivity: 1.9μΩ·cm; Density: 99.95%; Soft tensile strength: 300MPa Example 2 Resistivity: 1.9μΩ·cm; Density: 99.98%; Soft tensile strength: 312MPa Example 3 Resistivity: 1.9μΩ·cm; Density: 99.93%; Soft tensile strength: 305MPa Example 4 Resistivity: 1.9μΩ·cm; Density: 99.90%; Soft tensile strength: 320MPa

[0048] Table 2 shows the anti-adhesion performance indexes of the alloy filaments of Examples 1 to 4. The alloy filaments were processed into a high-frequency electric knife structure, connected to the power supply of the high-frequency electric knife to prepare a test version of the high-frequency electric knife, and the prepared high-frequency electric knife was used to test the pig's front leg for 20 minutes.

[0049] Table 2

[0050] Anti-adhesion performance Ordinary AgNi alloy A small amount of adhesion Example 1 No adhesion Example 2 No adhesion Example 3 No adhesion Example 4 No adhesion

Claims

1. A high-frequency electric knife anti-adhesion alloy, the mass percentage of which is: Ni: 9.3-10.2; rare earth oxide: 0.05-0.3; the balance is Ag and unavoidable impurities.

2. The alloy according to claim 1, wherein the rare earth oxide comprises at least two of cerium oxide, yttrium oxide and lanthanum oxide.

3. A method for preparing an alloy filament for electrocoagulation forceps, comprising: Providing Ni powder, Ag powder and rare earth oxide powder respectively, wherein the rare earth oxide comprises at least two of cerium oxide, yttrium oxide and lanthanum oxide; After mixing the above powders, heat to 300°C to 320°C in a hydrogen atmosphere, and keep the temperature for 20 to 40 minutes to obtain a reduced mixed powder, wherein Ni: 9.3 to 10.2 wt.%; rare earth oxide: 0.05 to 0.3 wt.%; the balance is Ag; Pressing the reduced mixed powder into a rod-shaped alloy billet; Vacuum sintering of alloy rods, where the sintering vacuum is less than 1*10 -2 , the sintering temperature is controlled at 1000℃~1100℃, and the sintering holding time is 2h~4h; and Alloy filaments of corresponding sizes are obtained by hot extrusion and drawing of vacuum sintered rod-shaped alloy billets.

4. The preparation method according to claim 3, wherein the particle size of the Ni powder and the Ag powder provided is 15 to 74 μm, and the particle size of the rare earth oxide is 5 to 10 μm. The preparation method according to claim 3 , wherein the powders are mixed by ball milling.

6. The preparation method according to claim 3, wherein the pressing molding is divided into two steps of cold pressing molding and cold isostatic pressing molding.

7. A high-frequency electric knife, at least partly made of the alloy according to claim 1 or 2.