Meeting the Minimally Invasive Challenge

As components become smaller, the machining obstacles multiply for manufacturers.
To lessen the impact on patients, minimally invasive surgery relies on small
components—in fact, “the smaller the better,” says Jyrki Larjanko, product
manager for Johnson Matthey Medical Products (San Diego), which machines a
number of minimally invasive parts.
Like an intricate part, the job of machining minimally invasive components
includes many details. The manufacturer must choose a machine and its proper
functions, select a material, finish the parts, and then verify that the parts
meet all requirements. Complicating these tasks is the diminutive scale of the
parts used in small-incision surgical procedures.

Keeping Tolerances Tight
When machining tiny parts for minimally invasive
challenges is holding extremely tight tolerances on part features. “The
tolerances are a lot tighter because you don’t have the forgiving nature of
larger parts moving against each other,” explains Al LaVezzi, president of
LaVezzi Precision Inc. (Glendale Heights, IL), a company that machines many
minimally invasive components for both manual surgical procedures and robotic
surgery.

To understand what LaVezzi means, consider a normal pair of scissors. If the two blades don’t interact smoothly, it takes more force to open and close the scissors; but it’s easy enough to apply the additional force required. Bostnurmostdrovil . what is a cloud In contrast, it can be very difficult to apply the extra for required to move a tiny pair of scissors that isn’t operating smoothly during a minimally invasive surgical procedure. tourist maps . Therefore, all the components of these tiny scissors are made very accurately to ensure smooth operation. Tolerances for components like this could be as tight as  ±0.0001 in., LaVezzi says.

Meeting the Minimally Invasive Challenge

As components become smaller, the machining obstacles multiply for manufacturers.
William Leventon, Med-Tech Precision-  Spring 2009

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