Abstract: An infusion pump for infusing drugs or other fluids into the body. The pump consists of two chambers. The storage chamber holds a large volume of drug at a variable and elevated pressure, which exceeds the preselected outflow pressure. The outflow chamber holds a smaller volume of drug at a constant outflow pressure. A moveable diaphragm attached to a valve controls the entry of the drug from the storage chamber into the outflow chamber. The pressure of the drug in the outflow chamber is determined by the forces applied to the diaphragm. The drug from the outflow chamber flows through a flow restrictor and catheter into the patient at a constant flow rate.

Abstract: A micro-bore catheter for use with an infusion pump wherein the micro-bore lumen of the catheter acts as an adjustable flow restricting element. The flow rate through the catheter can be increased proportionally by trimming the length of the catheter. One end of the catheter is attached to a needle for insertion of the catheter into the elastomeric septum of a drug infusion pump.

Abstract: A new and improved tube or catheter for administrating or withdrawing a substance from the human body which can be temporarily attached to the tissue site. The catheter consists of a dual lumen, side-by-side, tube. One lumen is used to administer or withdraw a substance. The second lumen contains an attachment means consisting of a loop of filament extending beyond the both ends of the lumen in the second tube. During use the surgeon fixes a suture at the tissue site and ties the suture around the filament loop extending from the distal end of the second tube. The surgeon then grasps the proximal end of the filament and slides the catheter over the filament and the suture until it rests against the tissue attachment site. The filament or suture is then tied around the proximal end of the tube to hold the catheter in place. To remove the catheter, the surgeon cuts the suture where tied to the proximal end of the tube, pulls off the catheter, and slides the suture out of the tissue.