Surgical clip in Nitinol

The Surgical clips are used in Laparoscopy. Examples of applications are to close veins or blood vessels inside the body. These can be manufactured in different materials. In the present case, Nitinol (shape-memory alloy) is used which, besides having the property that it can be “programmed” to regain a desired shape, it has super-elastic properties that enables opening and closing it.

There are high demands on surface integrity. The product must be free of burrs and oxides. Previously, the customer has processed these products with a water jet guided laser. This has limitations with a machining speed of about 30 mm/min and heavy slag formation. Subsequent electropolishing was required. Alternative machining methods was performed with Finecut machine from Finepart Sweden AB with the below conclusions.

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Data

Material:Nitinol
Material thickness:1.1 mm
Length of cut:138 mm
Annual volume:5 000 pcs

 

Cutting with Finecut WMC500II machining center 

Cutting systemFAW200
Number of set-ups1
Cutting distance138 mm
Average cutting speed72 mm/min
Operational cutting time110 sec
Finecut operational cost0.47 EUR/pc