Scalpel blade having high sharpness and toughness
A technology of surgical blades and Rockwell hardness, applied in the field of surgical blades and their products, can solve the problems of inability to maintain cutting edges, low efficiency, and reduced service life of sharp cutting edges, and achieve improved ductility, sharpness retention, and reduced brittleness The effect of broken trends
Inactive Publication Date: 2006-01-11
MOLECULAR METALLURGY INC
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Problems solved by technology
The result is that the tapered area of the blade still has a tendency to roll, which can make it ineffective
Also, because steel is soft and does not hold an edge, the service life of a sharp edge is greatly reduced, so the scalpel blade needs to be replaced before it can make many cuts
Method used
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[0021] Figure 1-3 A coated surgical blade 20 is described. Surgical blade 20 may be described as a body 24 having one parallel side 25 and a base 22 having a tapered region of converging sides 27 . The tapered region 26 is continuous with the body 24 and is sharpened to a cutting edge 28 . Tapered region 26 has an included angle A, such as image 3 As shown, from about 10 degrees to about 25 degrees, more preferably from about 10 degrees to about 18 degrees. If the included angle A is less than about 10 degrees, the tapered region 26 is too thin to have sufficient strength in use. If the included angle A is greater than about 25 degrees, the surgical blade is operable but the substrate is not sharp enough. Angles from about 10 degrees to about 18 degrees yield excellent sharpness and acceptable strength when substrate 22 is plated in the manner described hereinafter.
[0022] Substrate 22 is made of steel, preferably stainless steel such as Type 440 stainless steel, havi...
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Abstract
A scalpel blade is made by depositing a coating onto a tapered region of a substrate which is tapered with an included angle of from about 10 to about 25 degrees to an edge. The substrate is made of surgical-grade stainless steel hardened to a Rockwell C hardness of at least 54 and then annealed to a Rockwell C hardness of from about 46 to less than about 53. The coating overlying the tapered region has a thickness of from about 0.1 to about 2.5 micrometers and includes a first coating layer of a first metal, and a second coating layer overlying the first coating layer. The first coating layer is preferably zirconium or a zirconium-base alloy, and the second coating layer is preferably zirconium nitride. The edge may be atomically sharpened by applying a large negative voltage to the substrate relative to the deposition source while a portion of the thickness of the second coating layer is being deposited.
Description
technical field [0001] This invention relates to surgical blades and products thereof, and in particular, to those blades which maintain high toughness and sharpness during use. Background technique [0002] A scalpel is a small knife, usually with a removable blade, used in medical, veterinary, biological and other procedures for cutting workpieces. Surgical blades used in medical, veterinary, and biological procedures must be very sharp and cause as little damage as possible to the tissue being cut. They must remain sharp for as long as possible during surgery to reduce the number of instrument changes during surgery. [0003] Typical surgical blades are made of surgical grade stainless steel, which are hardened to a Rockwell hardness of approximately 54-62 in order to maintain the sharpness of their cutting edges throughout surgery. They are ground to a beveled edge angle of typically 26 degrees. We wanted to reduce the beveled edge angle to increase the sharpness of t...
Claims
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IPC IPC(8): A61B17/32B21K11/02C23C14/22A61B17/3211A61B17/00B26B9/00B26B21/60C23C14/02C23C14/06C23C28/00
CPCC23C28/347A61B17/3213C23C28/34C23C28/322C23C28/321A61B2017/00526B26B9/00C23C14/025C23C14/0641A61B2017/00831
Inventor 内森·K·梅克尔
Owner MOLECULAR METALLURGY INC