Surgical forceps and needle: what they have in common

1. Step 1. Surgical forceps — evolved into — Haemostat. A clamp with a lock.
2. Step 2. Haemostat — has part — Ratchet. A ratchet lock.
3. Step 3. Ratchet — is part of — Windlass. A ratchet holds the load.
4. Step 4. Windlass — uses — Crank. The handle of a windlass is a crank.
5. Step 5. Crank — is part of — Sewing machine. A crank turns rotation into the stroke of the needle.
6. Step 6. Sewing machine — has part — Needle. A needle with the eye near its point.

Open Evothings