Medical knife

Active Publication Date: 2007-08-02
MANI INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017] Since the medical knife according to the present invention is made of austenitic stainless steel, it has excellent corrosion resistance, thus is hard to rust. Moreover, since it has hardness of 550 Hv or greater, it has sufficient hardness and sharpness for medical use, and can be easily fabricated. Moreover, a very small medical knife for microsurgery can be easily fabricated from a thin wire 1 mm in diameter.

Problems solved by technology

With such a manufacturing method, since wire rods are subjected to annealing before processing, processing is easily performed; however, quenching and precipitation hardening treatment tend to cause a crack, a chip or a break due to lack of toughness.
Moreover, rust tends to develop due to the characteristics of the material, causing a problem of low corrosion resistance.
It is impossible for austenitic stainless steel to be subjected to quenching; instead, work hardening due to wire drawing is available.
Hei 1-11084 is suitable for suture needles; however, it cannot provide sufficient hardness for necessary sharpness for knives.
Sho 59-87988 is suitable for a fabrication of large cutting tools such as household cutting tools; however, it cannot be applied to a fabrication of small knives such as medical knives.
In particular, it is very difficult to fabricate medical knives for microsurgery.

Method used

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Example

[0032] An embodiment according to the present invention is described forthwith with reference to attached drawings.

[0033] Austenitic stainless steel SUS302 (carbon content: 0.15% or less) is used as the material for a medical knife according to the present invention. This type-B stainless steel SUS302 for springs or SUS304 having less carbon content may be used. The carbon content included in the SUS304 is 0.08% or less. However, since the carbon content greatly influences work hardening, the carbon content of the SUS304 is considered to be the lower limit, namely, approximately 0.08% to 0.15%.

[0034] Once a wire rod of SUS302 6 to 10 mm in diameter is subjected to solution heat treatment, the resulting wire rod is wire-drawn into 5 to 8 mm in diameter (reduction ratio is approximately 60%). This is subjected to solution heat treatment again, then wire-drawn into 2 to 3 mm in diameter (reduction ratio is approximately 60%). This is further subjected to solution heat treatment again, t

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Abstract

A work 10 made of a hard wire rod of austenitic-stainless steel is pressed at a rolling reduction of 60% or greater, into a paddle-shaped end 10b, and then subjected to work hardening, making the hardness of the end 10b 550 Hv or greater. Afterwards, the paddle-shaped end 10b is cut through machining, forming a main body 10c of a medical knife and cutting blades 10d. As a result, a medical knife, which is easily fabricated, is corrosion resistant, has sufficient hardness and sharpness, high toughness preventing cracks, can be provided.

Description

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Claims

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Application Information

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Owner MANI INC
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