18th Century Scarifactor Blood Fleam Bloodletting tool

Why bleed with one spring-loaded blade when you could have 4, 12, or even 20?!
As long ago as the 17th century there were multi-bladed bleeders called scarificators. These became very popular in the late 18th and 19th centuries. Like spring lancets, they came in every size and description. Shown are basic octagonal English scarificators. The cases are brass and the mechanism and blades are steel. Many had a depth adjuster for the blades on the top and the blades would be cocked by the lever on top. The release switch is on the side. This allowed the blades to swing around, making multiple cuts at once.
 
The Art of Bloodletting
Bloodletting is a historical medical practice where blood is removed from a person's body to treat illness. It was a common practice for thousands of years, dating back to ancient Egypt, Greece, and Rome.