What's the meaning of "entrapment"?

I'm a chinese hospital bed sales in China,I met a new word yesterday,"entrapment".Does anyone know what that word means?The whole sentence is "the backrest has an innovative ratchet actuator to reduce the risk of patient entrapment."
I'm glad to answering any questions about hospital bed if you have
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I believe entrapment in this context means "getting trapped." Trap means to get caught so one cannot escape.

en-trap (n-trp)tr.v. en-trapped, en-trap-ping, en-traps 1. To catch in or as if in a trap.To become caught in something, unable to escape and causing harm.

So a patient will not get stuck in a bed--tangled, fall through a gap, that type of thing.