A bone saw blade and method for manufacturing a bone saw blade

A - Human Necessities – 61 – B

Patent

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A61B 17/14 (2006.01)

Patent

CA 2483491

A bone saw blade (10) includes a blade body (11) having a cutting section (14), a hub section (16) and a shank (18) located between the cutting section (14) and the hub section (16). The blade body (11) is first formed having a substantially uniform Rockwell hardness between approximately Rc 49 and Rc 63 throughout. Next a cathodic arc process is used to coat the cutting section (14) with a hard, wear resistant metal nitride coating (19). During the coating process, ion impingement on the surface of the cutting section (14) creates heat that beneficially anneals the cutting section. Significant annealing of the shank (18) and hub section (16) is prevented during the coating process by stacking the blade bodies together with blade blanks (38) that are formed without cutting section. The heat generated during coating is insufficient to raise the temperature of the large mass above the annealing temperature of the blade material. The resultant blade has a high strength shank and hub section.

La présente invention concerne une lame de scie à os qui comprend un corps de lame possédant une section de coupe, une section embase et une soie située entre la section de coupe et la section embase. On commence par former un corps de lame d'une dureté Rockwell sensiblement uniforme comprise entre environ R<SB>C</SB>49 et R<SB>C</SB>63 sur toute la longueur. On utilise ensuite un processus à arc cathodique pour déposer sur la section de coupe un revêtement de nitrure métallique dur, résistant à l'usure. Au cours du processus de revêtement, l'impact des ions sur la surface de la section de coupe crée une chaleur qui recuit avantageusement la section de coupe. On évite tout recuit significatif de la soie et de la section embase au cours du processus de revêtement en empilant des corps de lames avec des découpes de lames formées sans sections de coupe. La chaleur produite pendant le revêtement n'est pas suffisante pour élever la température de cette grande masse au-dessus de la température de recuit du matériau de la lame. On obtient de la sorte une lame qui possède une soie et une section embase de grande résistance.

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