Cochlear implant and vacuum pump: what they have in common

1. Step 1. Cochlear implant — is made of — Titanium. The case is titanium.
2. Step 2. Titanium — is material for — Artificial heart valve. Titanium and pyrolytic carbon.
3. Step 3. Artificial heart valve — has part — Check valve. It works as a check valve.
4. Step 4. Check valve — is part of — Vacuum pump. Valves stop air from flowing back.

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