Biopsy forcep head and preparation method thereof

A technology of sampling pliers and pliers, which is applied in the field of sampling pliers and pliers, to achieve the effects of wide use value, reduction of consumption and processing costs, and high utilization rate of raw materials

Inactive Publication Date: 2018-03-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Another object of the present invention is to provide a method for preparing the pliers head of biopsy forceps. The technical problem to be solved is to make the pliers parts of the final shape directly prepared by metal powder inject

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The composition is carbon content 0.4%, chromium content 13%, molybdenum content 2%, manganese content 2%, niobium content 1.5%, copper content 1.2%, silicon content 0.5%, and the rest is iron atomized stainless steel powder as raw material Powder, median diameter of powder particles d 50 is 8 μm. The raw material powder is mixed with a binder consisting of 60% paraffin wax, 20% high-density polyethylene, 15% polypropylene and 5% stearic acid on a disc high-shear mixer, and the powder volume fraction is 60%, the kneading temperature is 160°C, the time is 2h, and the binder and powder particles are mixed and dispersed evenly. The binder and powder mixture are further mixed on a twin-screw extruder and made into pelletized feed. The feed material is formed on an injection molding machine with a forming pressure of 120 MPa and a temperature of 160° C. to obtain a forming pincer blank. Dissolve and remove the soluble components such as paraffin wax in trichlorethylene, a...

Embodiment 2

[0029] Atomized stainless steel powder with a carbon content of 0.2%, a chromium content of 14%, a molybdenum content of 2%, a manganese content of 2%, a niobium content of 1.5%, and a silicon content of 0.5% is used as the raw material powder. Particle size d 50is 8 μm. The raw material powder is mixed with a binder consisting of 60% paraffin wax, 20% high-density polyethylene, 15% polypropylene and 5% stearic acid on a disc high-shear mixer, and the powder volume fraction is 60%, the kneading temperature is 160°C, the time is 2h, and the binder and powder particles are mixed and dispersed evenly. The binder and powder mixture are further mixed on a twin-screw extruder and made into pelletized feed. The feed material is formed on an injection molding machine with a forming pressure of 120 MPa and a temperature of 160° C. to obtain a forming pincer blank. Dissolve and remove the soluble components such as paraffin wax in trichlorethylene, and the solvent degreasing time is ...

Embodiment 3

[0031] The composition is carbon content 0.6%, chromium content 15%, manganese content 2%, niobium content 2%, copper Cu content 1.2%, silicon Si content 0.5%, the rest is iron atomized stainless steel powder as raw material powder, powder Particle median diameter d 50 is 8 μm. The raw material powder is mixed with a binder consisting of 60% paraffin wax, 20% high-density polyethylene, 15% polypropylene and 5% stearic acid on a disc high-shear mixer, and the powder volume fraction is 60%, the kneading temperature is 160°C, the time is 2h, and the binder and powder particles are mixed and dispersed evenly. The binder and powder mixture are further mixed on a twin-screw extruder and made into pelletized feed. The feed material is formed on an injection molding machine with a forming pressure of 120 MPa and a temperature of 160° C. to obtain a forming pincer blank. Dissolve and remove the soluble components such as paraffin wax in trichlorethylene, and the solvent degreasing t...

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Abstract

The invention discloses a biopsy forcep head and a preparation method thereof. The biopsy forcep head comprises carbon, chromium, molybdenum, manganese, niobium, copper, silicon and iron. The preparation method includes the steps that alloy powder particles are prepared; the alloy powder particles and an organic matter binder are mixed to prepare feed; the feed is formed into a forcep head green body on an injection forming machine; the binder in the forcep head green body is removed to obtain a degreasing green body; and the degreasing green body of the forcep head is sintered, insulated andcooled and then the biopsy forcep head can be obtained. The material density of the forcep head prepared through the method is larger than 96%, the hardness is not lower than 480HV0.2, the tensile strength is not lower than 1000MPa, the impact value is higher than 10J/cm<2>, the dimensional accuracy of the product is +/-0.2%, and a neutral salt spray test is carried out for over 20h. Moreover, nonickel composition harmful to human bodies is contained in the forcep head material. By means of the biopsy forcep head and the preparation method thereof, high-efficiency and low-cost production of the biopsy forcep head can be achieved.

Description

technical field [0001] The invention relates to a sampling forceps head of an endoscope, in particular to a living body sampling forceps head and a preparation method thereof. Background technique [0002] At present, endoscopy has been widely used in clinic as a diagnostic method. In endoscopy, biopsy forceps are one of the necessary tools. Site tissue for pathological examination in order to confirm the diagnosis. Sampling through the endoscope is less traumatic and less painful, so it is well received by doctors and patients. [0003] The sampling forceps head is the key part of the living body sampling forceps. After the biopsy forceps enter the human body, the forceps head will directly contact the human tissue to extract the tissue. Therefore, there are strict requirements on the material composition of the forceps head, and Ni and other ingredients and substances that are allergic to the human body and suspected to be carcinogenic should be avoided. As a kind of cu...

Claims

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Application Information

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IPC IPC(8): B22F3/22B22F3/10B22F3/24C22C38/22C22C38/38C22C38/26C22C38/20C22C38/02
CPCB22F3/225B22F3/1007B22F3/24B22F2003/248B22F2999/00C22C38/02C22C38/20C22C38/22C22C38/26C22C38/38B22F2201/11
Inventor 秦明礼何庆鲁慧峰王浩吴昊阳贾宝瑞章林曲选辉
Owner UNIV OF SCI & TECH BEIJING
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