The French doctor Velpeau made some observations on aneurysms. He pricked a needle into an aneurysm and noticed the formation of a clot. In 1835, the French doctor Charles Gabriel Parvaz invented the hypodermic syringe for injecting ferric chloride. The syringe was made up of a silver cylinder and the lid of the pump body could be screwed down; the cylinder had a nozzle to which the cannula could be fixed, which was itself extended by a steel trocar. Fournier invented the glass syringe in 1895. To eject the liquid, a piston which could be pushed down quite easily was used. In 1946, Blaise Pascal made a syringe for scientific use. With this syringe, purgative clysters were administered.
