Leaving sponges or something in the patient’s body is not rare. On the one hand, doctors should be more responsible; on the other hand, we have to search a better way to prevent this kind of accidents.

Siemens and other companies have begun placing RFID chips in surgical sponges. Before finishing the operation, a wand is used to swipe the patient to ensure there are no sponges left in the body. In this way, I guess the accidents will be much less!

[source]