CN108836430B - Medical forceps and manufacturing method thereof - Google Patents
Medical forceps and manufacturing method thereof Download PDFInfo
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- CN108836430B CN108836430B CN201810595795.3A CN201810595795A CN108836430B CN 108836430 B CN108836430 B CN 108836430B CN 201810595795 A CN201810595795 A CN 201810595795A CN 108836430 B CN108836430 B CN 108836430B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
- A61B17/2812—Surgical forceps with a single pivotal connection
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/28—Surgical forceps
- A61B17/2812—Surgical forceps with a single pivotal connection
- A61B17/282—Jaws
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
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- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/057—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being less 10%
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00831—Material properties
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Abstract
The invention discloses a pair of medical forceps, which comprises a forceps body and a jaw, wherein the jaw is fixedly connected with the forceps body through laser spot welding, a welding seam gap is reserved at the joint of the jaw and the forceps body, graphitized brazing filler metal is coated in the welding seam gap, and the jaw and the forceps body are bonded into a whole through vacuum brazing. Also discloses a manufacturing method of the medical forceps. The medical forceps and the manufacturing method thereof improve the material selection range of the jaws, are not easy to fall off after welding, and prolong the service life; the welding interface is smooth and compact, almost no welding seam exists during welding, and the welding is firm; the welding connection between dissimilar metals is more durable and has stronger plasticity.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to a pair of medical forceps and a manufacturing method thereof.
Background
In the surgical operation, the medical forceps are an indispensable tool, the medical forceps are easy-to-consume tools as surgical tools, and the common manufacturing method is to use low or medium carbon stainless steel as a forceps body, and weld a knife edge made of high-hardness materials at the knife edge. However, since the low or medium carbon stainless steel has poor welding performance with the high hardness material of the jaw, i.e. is difficult to weld together, the bonding method is generally adopted. However, the difference of the metal structures between dissimilar metals causes the linear expansion coefficients of the dissimilar metals to be different, the filling metal and the molten base metal are mixed in the molten pool and at the edge, but the mixing condition has a certain difference, an incomplete mixing area appears at the boundary of a welding seam, a decarburized layer appears on one side of the dissimilar metal, a carbon-added layer appears on the other side of the dissimilar metal, and the plasticity and the durability of a welding structure are influenced.
Chinese patent document (publication date: 19/4/2017, publication number: CN 106562809A) discloses a medical forceps (scissors) comprising a handle, a forceps (scissors) head base and a forceps (scissors) mouth, wherein the hardness of the handle and the forceps (scissors) head base is less than that of the forceps (scissors) mouth, the forceps (scissors) mouth is connected to the forceps (scissors) head base, a welding flux is coated at the joint of the forceps (scissors) head base and the forceps (scissors) mouth, the forceps (scissors) head base and the forceps (scissors) mouth are bonded into a whole through the welding flux melted at high temperature, the handle and the forceps (scissors) head base are hardened or solid-dissolved while welding at high temperature, and the forceps (scissors) mouth bonded into a whole is locally hardened through high frequency or laser or flame. Also discloses a processing method of the medical forceps (scissors). The medical forceps (scissors) prepared by the processing method has the advantages of high hardness of a forceps (scissors) opening, no falling, good antirust property, long service life, no blackening of the forceps (scissors) opening, more convenience in material selection, wide material selection range and great reduction of the manufacturing cost.
The above technical solution adopts a flux bonding method to solve the problems of peeling off, blackening and the like, but the above technical solution cannot solve the problem of carbon migration during the welding of dissimilar metals.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, the jaw and brazing filler metal are limited greatly due to the fact that carbon migration occurs when medical forceps are welded by dissimilar metals, and the like, and provides the medical forceps and the manufacturing method thereof, wherein the formation of carbides can be effectively inhibited, a diffusion layer is prevented from being formed due to carbon migration, the jaw is wide in material selection range, the medical forceps are not prone to falling off after welding, and the service life of the medical forceps is prolonged.
The technical scheme adopted by the invention for realizing the technical purpose is as follows: the utility model provides a medical forceps, includes the pincers body and keeps silent, keep silent through laser spot welding and pincers body fixed connection, keep having the welding seam clearance with pincers body laminating department, the inside graphitizing brazing filler metal that coats of welding seam clearance, keep silent and pincers body through vacuum brazing bonding as an organic whole. This medical pincers, through improving vice jaw and pincers body connected mode, fix the preset position at the pincers body with laser spot welding earlier with vice jaw to leave the welding seam clearance in the laminating department of vice jaw and pincers body, and in the inside graphitizing brazing filler metal that coats of welding seam clearance, put into vacuum brazing stove with it and braze, make vice jaw and pincers body even be a whole. This medical pincers, with ordinary brazing filler metal innovation for graphitizing brazing filler metal, the formation of carbide is effectively inhibited in the use of this kind of graphitizing brazing filler metal to avoid carbon migration to form the diffusion barrier, make to connect more lastingly and have stronger plasticity between the xenogenesis steel. The jaw and the clamp body are more convenient and wide in material selection, the cost is saved, and the jaw is not easy to fall off.
Preferably, the clamp body is a component made of medium-low carbon steel; the jaw is a high-carbon steel material component. The use requirements of the hardness of the jaw are met by manufacturing the pliers body and the jaw by different metals, the requirement that the pliers body is made of diversified materials is met, and the cost is reduced.
Preferably, the forceps body comprises a forceps head and a forceps handle, and the forceps head and the forceps handle are detachably connected through a clamping card or a thread. The forceps body is provided with the binding clip and the forceps handle and adopts the detachable connection, and different binding clips can be changed on the forceps handle as required in the operation conveniently through the structure, so that the universal design of the forceps handle is realized, different use requirements can be met only by changing the binding clip of the easy-consumption medical forceps, the manufacturing cost is reduced, and the universal manufacture is improved.
Preferably, the forceps handle is of a telescopic structure and comprises a holding part and a telescopic part, and the telescopic part is movably sleeved inside the holding part and is positioned through a clamping structure arranged on the telescopic part and the holding part; the tong head is detachably connected with the telescopic part. The forceps handle is of a telescopic structure, so that the use efficiency of the forceps handle can be effectively improved, and the use requirements of different operations and different users can be met.
Preferably, the graphitized brazing filler metal comprises a brazing filler metal matrix and nano graphite powder sprayed outside the brazing filler metal matrix; the mass ratio of the nano graphite powder to the brazing filler metal matrix is 0.01-0.05: 1.
The technical scheme adopted by the invention for realizing the second invention purpose is as follows: a method for manufacturing medical forceps comprises the following steps:
step 1: manufacturing a clamp body and a clamp opening, namely manufacturing the clamp opening by using high-carbon steel, manufacturing the clamp body by using medium-low carbon steel and presetting a clamp opening connecting part on the clamp body;
step 2: fixing the jaw on a jaw connecting part on the clamp body through laser spot welding; a welding seam gap is reserved at the joint of the jaw and the jaw connecting part;
and step 3: preparing a graphitized solder, namely spraying the nano graphite dispersion liquid on a solder matrix to form the graphitized solder;
and 4, step 4: inserting the graphitized brazing filler metal obtained in the step 3 into the welding seam gap between the jaw and the clamp body in the step 2;
and 5: placing the jaw and the clamp body coated with the graphitized brazing filler metal into a vacuum or inert gas brazing device for brazing, and welding the jaw and the clamp body into a whole;
step 6: and (5) carrying out local high-temperature quenching treatment on the jaw of the medical clamp in the step (5) to finally form the finished medical clamp.
The manufacturing method of the medical forceps adopts dissimilar metals to manufacture the jaw and the forceps body, and manufactures graphitized brazing filler metal, firstly fixes the jaw at a reserved position of the forceps body by using laser spot welding, then coats the graphitized brazing filler metal in a gap between the jaw and the forceps body, and then puts the medical forceps into a vacuum or inert gas brazing device for brazing, when the temperature in the brazing device rises to a set brazing temperature value, the graphitized brazing filler metal is melted into liquid state and completely fills the gap between the welding seams, and generates metallurgical chemical reaction with the jaw and the forceps body, because of the existence of graphite powder on the surface of the brazing filler metal, the process of fusion welding in a micro-area is performed in the welding process, only the interfaces of the jaw and the jaw are between several micrometers and less than ten micrometers, and the deep structure is not involved, so the occurrence of the carbon migration phenomenon on the surface of the dissimilar metals can be effectively inhibited, effectively restrain the formation of carbide through the graphitization to avoid carbon migration to form the diffusion barrier, make to connect more lasting and have stronger plasticity between the xenogenesis steel, at subsequent cooling in-process, liquid graphitizing brazing filler metal makes keeping silent and pincers body even as a whole and has realized the welding, should weld the welding and have the welding seam hardly moreover, and the welding is firm, can not drop. The manufacturing method of the medical forceps can select the forceps jaws and the forceps bodies made of different materials and different hardness, the material selection is more convenient and wider, the cost is saved, the forceps jaws are not easy to fall off, and the service life of the medical forceps is prolonged. When the host reactant (matrix) in intercalation reaction (intercalation reaction) is a layered structure, guest molecules G are intercalated between layers to form a layered structure. For example, graphite produces first, second or third order intercalation compounds, and intercalation is characterized by some structural openness that allows foreign atoms or ions to readily diffuse into or out of the crystal. A large number of layered compounds are capable of undergoing intercalation;
preferably, the preparation of the nano-graphite dispersion liquid in the step 3: the components comprise, by weight, 0.5-1.5 parts of natural graphite, 0.2-0.25 part of potassium permanganate, 1.5-1.9 parts of fuming nitric acid and 0.45-0.5 part of oxalic acid, and the components are reacted at the temperature of 35-40 ℃ for 35-40 min; washing the obtained reaction mixture with deionized water to be neutral, drying at 65-70 ℃, and preserving heat at 1000 ℃ for 10-15 min to prepare the expanded fossil toner; and fully and uniformly mixing the prepared expanded fossil ink powder with a dispersing agent to form a nano graphite dispersion liquid. The preparation process of the nano graphite dispersion liquid comprises the steps of carrying out intercalation reaction on natural graphite, potassium permanganate, fuming nitric acid and oxalic acid to obtain an intercalation reaction mixture, washing the intercalation reaction mixture to be neutral by using deionized water, drying, preserving heat to obtain expanded fossil ink powder, and then fully mixing the expanded fossil ink powder with a graphite dispersing agent to form the nano graphite dispersion liquid.
Preferably, the brazing filler metal in the step 3 consists of the following components: cr, B, Si, Fe, La and Ni, wherein the components in parts by weight are as follows: 6.0-8.0 parts of Cr, 2.75-3.5 parts of B, 4.0-5.0 parts of Si, 2.5-3.5 parts of Fe, 0.1-0.5 part of La and 79.5-84.65 parts of Ni. The brazing filler metal is prepared from the components, the rare earth element has high activity and large atomic radius, and can play roles in modifying, purifying and refining tissues.
Preferably, the specific surface area of the nano-graphite powder formed after the nano-graphite dispersion liquid is sprayed on the brazing filler metal in the step 3 is 500 cm2/g～1000cm2The mass ratio of the nano graphite powder to the brazing filler metal is 0.01-0.05: 1. The specific surface seed of the nano graphite powder is preferably 500 cm2/g～1000cm2The graphite powder has too large particle size when the specific surface area is too small, which is not beneficial to uniform coating of the brazing filler metal, the graphite powder with too large specific surface area has too small size, which is smaller than the spraying size of the sprayed brazing filler metal, so that metal components in the brazing filler metal cannot enter the internal structure of the graphite powder, and the subsequent welding effect is influenced when the specific surface area is too large or too small. The mass ratio of the nano graphite powder to the brazing filler metal is preferably 0.01-0.05: 1, so that the requirement of the graphitized brazing filler metal on inhibiting carbon migration can be met, and the preparation of the brazing filler metal is facilitated.
Preferably, the temperature of the vacuum brazing is 1000-1200 ℃, and the vacuum degree is less than or equal to 10-3The holding time under Pa is 10min to 50 min.
The invention has the beneficial effects that: the medical forceps has the advantages that the material selection range of the jaws is improved, the jaws are not easy to fall off after welding, and the service life is prolonged; the welding interface is smooth and compact, almost no welding seam exists during welding, and the welding is firm; the welding connection between dissimilar metals is more durable and has stronger plasticity.
Drawings
Fig. 1 is a schematic structural view of the medical forceps of the invention.
Fig. 2 is a schematic view of an exploded structure of the medical forceps of the present invention.
FIG. 3 is a schematic structural view of the graphitized solder in the present invention;
FIG. 4 is a schematic view of another embodiment of the medical forceps of the present invention;
FIG. 5 is an enlarged view at A in FIG. 4;
in the figure: 1. the clamp comprises a clamp body, 2 parts of a clamp jaw, 3 parts of a weld gap, 4 parts of graphitized brazing filler metal, 5 parts of a clamp head, 6 parts of a clamp handle, 7 parts of a holding part, 8 parts of a telescopic part, 9 parts of a clamping structure, 10 parts of a brazing filler metal matrix, 11 parts of nano graphite powder.
Detailed Description
The technical solution of the present invention is further described in detail by the following specific embodiments with reference to the accompanying drawings. The starting materials used in the examples are commercially available or can be prepared by conventional methods, and the amounts used in the examples are indicated in parts by weight. The dispersant is a commercially available graphite dispersant No. 15 or No. 16.
Example 1:
in the embodiment shown in fig. 1 and 2, the medical forceps comprises a forceps body 1 and a jaw 2, wherein the jaw 2 is fixedly connected with the forceps body 1 through laser spot welding, a weld gap 3 is reserved at the joint of the jaw 2 and the forceps body 1, graphitized brazing filler metal 4 is coated in the weld gap 3, and the jaw 2 and the forceps body 1 are bonded into a whole through vacuum brazing. The jaws 2 are curved jaws.
The clamp body 1 is a component made of medium-low carbon steel; the jaw 2 is a high-carbon steel material member.
The pliers body 1 comprises a pliers head 5 and a pliers handle 6, and the pliers head 5 and the pliers handle 6 are detachably connected through a plug-in card or a thread. In the embodiment, the clamp head is connected with the clamp handle in a plug-in manner.
The forceps handle 6 is of a telescopic structure, the forceps handle 6 comprises a holding part 7 and a telescopic part 8, and the telescopic part 8 is movably sleeved inside the holding part 7 and is positioned through a clamping structure 9 arranged on the telescopic part 8 and the holding part 7; the binding clip 5 is detachably connected with the telescopic part 8. The holding part can be in a circular ring structure or an arc structure, and the telescopic part can be in a straight line section, namely, in a circular structure or a square structure.
The graphitized solder 4 comprises a solder matrix 10 and nano graphite powder 11 sprayed on the outside of the solder matrix 10 (see fig. 3); the mass ratio of the nano graphite powder 11 to the brazing filler metal matrix 10 is 0.01-0.05: 1.
Preparation of graphitized solder 4: (1) preparing a nano graphite dispersion liquid: the components comprise, by weight, 0.5 part of natural graphite, 0.2 part of potassium permanganate, 1.5 parts of fuming nitric acid and 0.45 part of oxalic acid, and the components are subjected to intercalation reaction at 35 ℃ for 35 min; washing the obtained intercalation reaction mixture with deionized water to be neutral, drying at 65 ℃, and preserving heat at 1000 ℃ for 10min to prepare expanded fossil toner; fully and uniformly mixing the prepared expanded fossil ink powder with a dispersing agent to form a nano graphite dispersion liquid; the expanded fossil toner and the dispersant in this embodiment are continuously pulverized and uniformly mixed in an ultrasonic cleaner to form a nano-graphite dispersion liquid.
(2) The brazing filler metal consists of the following components: cr, B, Si, Fe, La and Ni, wherein the components in parts by weight are as follows: 6.0 parts of Cr, 2.75 parts of B, 4.0 parts of Si, 2.5 parts of Fe, 0.1 part of La and 84.65 parts of Ni.
(3) The specific surface area of the nano graphite powder formed after the nano graphite dispersion liquid is sprayed on the brazing filler metal is 500 cm2/g, and the mass ratio of the nano graphite powder to the brazing filler metal is 0.01: 1.
The manufacturing method of the medical forceps comprises the following steps:
step 1: manufacturing a clamp body and a clamp opening, namely manufacturing the clamp opening by using high-carbon steel, manufacturing the clamp body by using medium-low carbon steel and presetting a clamp opening connecting part on the clamp body;
step 2: fixing the jaw on a jaw connecting part on the clamp body through laser spot welding; a welding seam gap is reserved at the joint of the jaw and the jaw connecting part;
and step 3: preparing a graphitized solder, namely spraying the nano graphite dispersion liquid on a solder matrix to form the graphitized solder;
and 4, step 4: inserting the graphitized brazing filler metal obtained in the step 3 into the welding seam gap between the jaw and the clamp body in the step 2;
and 5: placing the jaw and the clamp body coated with the graphitized brazing filler metal into a vacuum brazing device for brazing, and welding the jaw and the clamp body into a whole; the temperature of vacuum brazing is 1000 ℃, and the holding time is 10min under the vacuum degree of less than or equal to 10-3 Pa;
step 6: and (5) carrying out local high-temperature quenching treatment on the jaw of the medical clamp in the step (5) to finally form the finished medical clamp.
Example 2
In the embodiment shown in fig. 4 and 5, the medical forceps comprises a forceps body 1 and a forceps jaw 2, wherein the forceps jaw 2 is fixedly connected with the forceps body 1 through laser spot welding, a welding seam gap 3 is reserved at the joint of the forceps jaw 2 and the forceps body 1, graphitized brazing filler metal 4 is coated in the welding seam gap 3, and the forceps jaw 2 and the forceps body 1 are bonded into a whole through vacuum brazing. The jaws 2 are straight jaws. The clamp body 1 is a component made of medium-low carbon steel; the jaw 2 is a high-carbon steel material member. The pliers body 1 comprises a pliers head 5 and a pliers handle 6, and the pliers head 5 and the pliers handle 6 are detachably connected in a plug-in manner.
The forceps handle 6 is of a telescopic structure, the forceps handle 6 comprises a holding part 7 and a telescopic part 8, and the telescopic part 8 is movably sleeved inside the holding part 7 and is positioned through a clamping structure 9 arranged on the telescopic part 8 and the holding part 7; the binding clip 5 is detachably connected with the telescopic part 8. The holding part is in a circular structure, and the telescopic part is in a straight line section and is in a square structure.
The graphitized solder 4 comprises a solder matrix 10 and nano graphite powder 11 sprayed outside the solder matrix 10; the mass ratio of the nano graphite powder 11 to the brazing filler metal matrix 10 is 0.01-0.05: 1.
Preparation of graphitized solder 4:
(1) preparing a nano graphite dispersion liquid: the components comprise, by weight, 1.5 parts of natural graphite, 0.25 part of potassium permanganate, 1.9 parts of fuming nitric acid and 0.5 part of oxalic acid, and the components are subjected to intercalation reaction at 40 ℃ for 40 min; washing the obtained intercalation reaction mixture with deionized water to neutrality, drying at 70 deg.C, and maintaining at 1000 deg.C for 15 min to obtain expanded fossil toner; and fully and uniformly mixing the prepared expanded fossil ink powder with a dispersing agent to form a nano graphite dispersion liquid. The expanded fossil toner and the dispersant in this embodiment are continuously pulverized and uniformly mixed in an ultrasonic cleaner to form a nano-graphite dispersion liquid.
(2) The brazing filler metal consists of the following components: cr, B, Si, Fe, La and Ni, wherein the components in parts by weight are as follows: 8.0 parts of Cr, 3.5 parts of B, 5.0 parts of Si, 3.5 parts of Fe, 0.5 part of La and 79.5 parts of Ni.
(3) The specific surface area of the nano-graphite powder formed after the nano-graphite dispersion liquid is sprayed on the brazing filler metal is 51000cm2/g, and the mass ratio of the nano-graphite powder to the brazing filler metal is 0.05: 1.
The manufacturing method of the medical forceps comprises the following steps:
step 1: manufacturing a clamp body and a clamp opening, namely manufacturing the clamp opening by using high-carbon steel, manufacturing the clamp body by using medium-low carbon steel and presetting a clamp opening connecting part on the clamp body;
step 2: fixing the jaw on a jaw connecting part on the clamp body through laser spot welding; a welding seam gap is reserved at the joint of the jaw and the jaw connecting part;
and step 3: preparing a graphitized solder, namely spraying the nano graphite dispersion liquid on a solder matrix to form the graphitized solder;
and 4, step 4: inserting the graphitized brazing filler metal obtained in the step 3 into the welding seam gap between the jaw and the clamp body in the step 2;
and 5: placing the jaw and the clamp body coated with the graphitized brazing filler metal into an inert gas brazing device for brazing, and welding the jaw and the clamp body into a whole; the temperature of the inert gas brazing is 1200 ℃, and the holding time is 50 min;
step 6: and (5) carrying out local high-temperature quenching treatment on the jaw of the medical clamp in the step (5) to finally form the finished medical clamp.
Example 3:
preparation of graphitized solder 4: (1) preparing a nano graphite dispersion liquid: the components comprise, by weight, 0.75 part of natural graphite, 0.225 part of potassium permanganate, 1.7 parts of fuming nitric acid and 0.475 part of oxalic acid, and the components are subjected to intercalation reaction at 37.5 ℃ for 37.5 min; washing the obtained intercalation reaction mixture with deionized water to be neutral, drying at 67.5 ℃, and preserving heat at 1000 ℃ for 12.5 min to prepare expanded fossil toner; and fully and uniformly mixing the prepared expanded fossil ink powder with a dispersing agent to form a nano graphite dispersion liquid. The expanded fossil toner and the dispersant in this embodiment are continuously pulverized and uniformly mixed in an ultrasonic cleaner to form a nano-graphite dispersion liquid.
(2) The brazing filler metal consists of the following components: cr, B, Si, Fe, La and Ni, wherein the components in parts by weight are as follows: 7.07 parts of Cr, 3 parts of B, 4.5 parts of Si, 3 parts of Fe, 0.3 part of La and 82 parts of Ni.
(3) The specific surface area of the nano graphite powder formed after the nano graphite dispersion liquid is sprayed on the brazing filler metal is 700cm2/g, and the mass ratio of the nano graphite powder to the brazing filler metal is 0.03: 1.
The manufacturing method of the medical forceps comprises the following steps:
step 1: manufacturing a clamp body and a clamp opening, namely manufacturing the clamp opening by using high-carbon steel, manufacturing the clamp body by using medium-low carbon steel and presetting a clamp opening connecting part on the clamp body;
step 2: fixing the jaw on a jaw connecting part on the clamp body through laser spot welding; a welding seam gap is reserved at the joint of the jaw and the jaw connecting part;
and step 3: preparing a graphitized solder, namely spraying the nano graphite dispersion liquid on a solder matrix to form the graphitized solder;
and 4, step 4: inserting the graphitized brazing filler metal obtained in the step 3 into the welding seam gap between the jaw and the clamp body in the step 2;
and 5: placing the jaw and the clamp body coated with the graphitized brazing filler metal into a vacuum brazing device for brazing, and welding the jaw and the clamp body into a whole; the temperature of the vacuum brazing is 1100 ℃, and the vacuum degree is less than or equal to 10-3The holding time under Pa is 30 min.
Step 6: and (5) carrying out local high-temperature quenching treatment on the jaw of the medical clamp in the step (5) to finally form the finished medical clamp.
The medical forceps and the manufacturing method thereof in the embodiment adopt different metals to manufacture the jaw and the forceps body, and manufacture the graphitized brazing filler metal, firstly fix the jaw at the reserved position of the forceps body by laser spot welding, then coat the graphitized brazing filler metal in the gap between the jaw and the forceps body, then put the medical forceps into a vacuum or inert gas brazing device for brazing, when the temperature in the brazing device rises to the set brazing temperature value, the graphitized brazing filler metal is melted into liquid state and completely fills the gap between the welding seams, and has metallurgical chemical reaction with the jaw and the forceps body, because of the existence of graphite powder on the surface of the brazing filler metal, the welding in a micro-area is carried out in the welding process, only the interfaces of the jaw and the jaw of the two different metals are carried out on the interface of a few micrometers to less than ten micrometers, and the deep structure is not involved, so the occurrence of the carbon migration phenomenon on the surface of the different metals can, effectively restrain the formation of carbide through the graphitization to avoid carbon migration to form the diffusion barrier, make to connect more lasting and have stronger plasticity between the xenogenesis steel, at subsequent cooling in-process, liquid graphitizing brazing filler metal makes keeping silent and pincers body even as a whole and has realized the welding, should weld the welding and have the welding seam hardly moreover, and the welding is firm, can not drop.
The common brazing filler metal is graphitized, the formation of carbide is effectively inhibited through the graphitization, so that a diffusion layer is prevented from being formed by carbon migration, the welding connection between dissimilar metal materials is more durable and has stronger plasticity, the rare earth element has high activity and large atomic radius, and the effects of deterioration, purification and tissue refinement can be achieved.
Claims (7)
1. The utility model provides a medical forceps, includes the pincers body (1) and keeps silent (2), its characterized in that: the clamp jaw (2) is fixedly connected with the clamp body (1) through laser spot welding, a weld gap (3) is reserved at the joint of the clamp jaw (2) and the clamp body (1), graphitized solder (4) is coated inside the weld gap (3), and the graphitized solder (4) comprises a solder matrix (10) and nano graphite powder (11) sprayed outside the solder matrix (10); the mass ratio of the nano graphite powder (11) to the brazing filler metal matrix (10) is 0.01-0.05: 1; the clamp body (1) is a component made of medium-low carbon steel material; the jaw (2) is a high-carbon steel material component; the jaw (2) and the clamp body (1) are bonded into a whole through vacuum brazing; in the welding process, the graphitized brazing filler metal is melted into liquid and completely fills the gap of the welding line, and generates metallurgical chemical reaction with the jaw and the clamp body to realize welding by fusion welding of a micro-area.
2. The medical forceps of claim 1, wherein: the pliers body comprises a pliers head (5) and a pliers handle (6), wherein the pliers head (5) and the pliers handle (6) are detachably connected through a plug-in card or a thread type.
3. The medical forceps of claim 2, wherein: the clamp handle (6) is of a telescopic structure, the clamp handle (6) comprises a holding part (7) and a telescopic part (8), and the telescopic part (8) is movably sleeved inside the holding part (7) and is positioned through a clamping structure (9) arranged on the telescopic part (8) and the holding part (7); the tong head (5) is detachably connected with the telescopic part (8).
4. A method for manufacturing medical forceps is characterized by comprising the following steps:
step 1: manufacturing a clamp body and a clamp opening, namely manufacturing the clamp opening by using high-carbon steel, manufacturing the clamp body by using medium-low carbon steel and presetting a clamp opening connecting part on the clamp body;
step 2: fixing the jaw on a jaw connecting part on the clamp body through laser spot welding; a welding seam gap is reserved at the joint of the jaw and the jaw connecting part;
and step 3: preparing a graphitized solder, namely spraying the nano graphite dispersion liquid on a solder matrix to form the graphitized solder; the specific surface area of the nano graphite powder formed after the nano graphite dispersion liquid is sprayed on the brazing filler metal is 500 cm2/g～1000cm2The mass ratio of the nano graphite powder to the brazing filler metal is 0.01-0.05: 1;
and 4, step 4: inserting the graphitized brazing filler metal obtained in the step 3 into the welding seam gap between the jaw and the clamp body in the step 2;
and 5: placing the jaw and the clamp body coated with the graphitized brazing filler metal into a vacuum or inert gas brazing device for brazing, and welding the jaw and the clamp body into a whole; in the welding process, the graphitized brazing filler metal is melted into liquid and completely fills the gap of the welding line, and generates metallurgical chemical reaction with the jaw and the clamp body to realize welding by fusion welding of a micro-area;
step 6: and (5) carrying out local high-temperature quenching treatment on the jaw of the medical clamp in the step (5) to finally form the finished medical clamp.
5. The method for manufacturing a medical forceps as claimed in claim 4, characterized in that: preparing nano graphite dispersion liquid in step 3: the components comprise, by weight, 0.5-1.5 parts of natural graphite, 0.2-0.25 part of potassium permanganate, 1.5-1.9 parts of fuming nitric acid and 0.45-0.5 part of oxalic acid, and the components are reacted at the temperature of 35-40 ℃ for 35-40 min; washing the obtained reaction mixture with deionized water to be neutral, drying at 65-70 ℃, and preserving heat at 1000 ℃ for 10-15 min to prepare the expanded fossil toner; and fully and uniformly mixing the prepared expanded fossil ink powder with a dispersing agent to form a nano graphite dispersion liquid.
6. The method for manufacturing a medical forceps as claimed in claim 5, characterized in that: the brazing filler metal in the step 3 consists of the following components: cr, B, Si, Fe, La and Ni, wherein the components in parts by weight are as follows: 6.0-8.0 parts of Cr, 2.75-3.5 parts of B, 4.0-5.0 parts of Si, 2.5-3.5 parts of Fe, 0.1-0.5 part of La and 79.5-84.65 parts of Ni.
7. The method for manufacturing a medical forceps as claimed in claim 4, 5 or 6, characterized in that: the temperature of the vacuum brazing is 1000-1200 ℃, and the vacuum degree is less than or equal to 10-3The holding time under Pa is 10min to 50 min.
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| CN208942289U (en) * | 2018-06-11 | 2019-06-07 | 浙江亚通焊材有限公司 | A kind of medical calm |
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| JPH0584363A (en) * | 1991-08-20 | 1993-04-06 | Mitsubishi Materials Corp | Scissors and manufacture thereof |
| DE19733035A1 (en) * | 1997-07-31 | 1999-02-18 | Aesculap Ag & Co Kg | Scissors for medical use |
| CN1884060A (en) * | 2006-07-11 | 2006-12-27 | 河北农业大学 | Process for preparing expandable graphite with high reference expansion temperature |
| CN104786027A (en) * | 2015-04-28 | 2015-07-22 | 杭州创亚医疗器械有限公司 | BG42 stainless steel medical clamp and manufacturing method thereof |
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Address after: No. 372, Jinpeng Street, Sandun Industrial Zone, Xihu District, Hangzhou, Zhejiang, 310012 Patentee after: Zhejiang Yatong New Materials Co.,Ltd. Patentee after: HANGZHOU DTC MEDICAL APPARATUS CO.,LTD. Address before: No. 372, Jinpeng Street, Sandun Industrial Zone, Xihu District, Hangzhou, Zhejiang, 310012 Patentee before: ZHEJIANG ASIA GENERAL SOLDERING & BRAZING MATERIAL Co.,Ltd. Patentee before: HANGZHOU DTC MEDICAL APPARATUS CO.,LTD. |