Abstract: An atherectomy apparatus and method is disclosed for the purpose of surgical excision of atheromas which typically consist of plaque deposits that cause narrowing (stenosis) of an artery. The apparatus, called a pullback atherectomy catheter, cuts and collects obstructive material into a collection chamber as the catheter is pulled back through obstructive material within a human vessel such as an artery.

Abstract: A Finger Actuated Medication Infusion System (FAMIS) for delivering a dosage of medication into a living body. The FAMIS is fully mechanical and comprises a reservoir, a pump and connecting catheters. The reservoir includes a sealed bellows portion which contains a pressurant and exerts a substantially constant pressure on the medication in the reservoir, regardless of the amount of medication therein. The pump includes a bellows assembly disposed within an equalizing pressure chamber, and will deliver medication through the bellows assembly at a predetermined flow rate independent of ambient temperature, ambient pressure or the amount of medication remaining in the reservoir. The FAMIS design also provides safeguards against inadvertant overdosing, transmission of bacteria into the body and prevents gas bubbles within the reservoir from impeding the flow of medication through an outlet flow restrictor which forms part of the FAMIS pump.