This is another option that I would suggest. It is better than knife and seems to be the exact translation. Please see the link below. Splinter is suggested in the article.

"Sushrut’s era, as all down the ages, involved warfare. This meant injury from weapons such as arrows often embedding as splinters – shalya."

He has categorised two types of symptoms for splinters – general and specific – from which a diagnosis can be made, of the type of splinter and its exact depth. He further details the different symptoms for different splinters of bone, wood, metal embedded in skin, muscle, bones, joints, ducts, pipes or tubes. He then prescribes fifteen different procedures for removing loose splinters.

https://www.baps.org/Spiritual-Living/Weekly-Satsang/Enlight...