Angioplasty and internal combustion engine: what they have in common

1. Step 1. Angioplasty — has part — Catheter. A balloon catheter.
2. Step 2. Catheter — is part of — IV drip. A catheter.
3. Step 3. IV drip — has part — Syringe. A needle.
4. Step 4. Syringe — has part — Piston. A plunger.
5. Step 5. Piston — is part of — Internal combustion engine. The burning mixture pushes the piston.

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