Instrument Manufacturing and Repair 1 Flashcards
6 cards from real CIS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Instrument Manufacturing and Repair 1 flashcards as text
Which manufacturing process involves heating stainless steel to a specific temperature and then rapidly cooling it to relieve internal stresses and improve ductility?
Answer: Annealing
Annealing involves heating metal to a defined temperature and then cooling it in a controlled manner to relieve residual stresses introduced during forging or machining, improving the instrument's ductility and workability.
What is the primary reason surgical scissors are manufactured with a hollow-ground blade design?
Answer: To create a sharper, longer-lasting cutting edge
Hollow-ground blades have a concave bevel that produces a thinner, keener cutting edge compared to flat-ground blades. This geometry maintains sharpness longer and allows the scissors to cut tissue cleanly with less force.
During instrument manufacturing, what does the term 'drop forging' refer to?
Answer: Shaping heated metal by pressing or hammering it into a die
Drop forging is a manufacturing method in which heated metal blanks are shaped by pressing or hammering them between two dies. This process aligns the grain structure of the metal, producing instruments that are stronger and more durable than those made by casting.
What characteristic of an instrument's box lock indicates that it requires repair rather than continued use?
Answer: Lateral wobble or excessive side-to-side movement of the jaws
Lateral wobble at the box lock indicates that the pivot pin or the lock itself has worn to the point where the two shanks no longer align properly. This misalignment prevents the jaws from meeting correctly, compromising instrument function and requiring repair or retirement.
Which surface finish on a surgical instrument is best suited for use in procedures where reducing glare from surgical lighting is a priority?
Answer: Satin or matte finish
A satin or matte finish creates a microscopically textured surface that scatters light rather than reflecting it directly, significantly reducing glare. This is particularly important in delicate procedures such as microsurgery or ophthalmology where operating room lighting could interfere with the surgeon's vision.
What is the correct method for testing the tension and alignment of a repaired needle holder prior to returning it to service?
Answer: Use a test needle of the appropriate size and verify it does not rotate when the ratchet is engaged at the first tooth
The standard functional test for a needle holder is to clamp a test needle of the size the instrument is designed for, engage the ratchet at the first tooth, and verify that the needle does not rotate or slip. Rotation indicates insufficient jaw tension, a defective ratchet, or worn tungsten carbide inserts.