Hello @Oliver,
The chip is not broken. The actual silicon “die” (the small silicon IC) is attached to a small circuit board and this circuit board is attached to the antenna rod with very small wires. The chip “floats” separately from the antenna rod, but it is all encased in epoxy resin so it is extremely resilient.
Have you attempted to clone data to your xEM or change the data on it? Did it stop working immediately after your injury?