STEPPED CATHETERS WITH FLOW RESTRICTORS AND INFUSION SYSTEMS USING THE SAME

摘要

A stepped catheter comprising a distal portion of smaller diameter than a proximal portion, wherein the distal portion defines a flow aperture configured to deliver fluid passing through the catheter from the proximal portion to the flow aperture. The catheter may include a flow restrictor located within a lumen of the catheter at or near the flow aperture. A filter element may also be included and located within the lumen of the catheter at a location upstream of the flow restrictor.

主权项

1. A catheter assembly, comprising:
a tubular catheter body having proximal and distal ends, the body comprising an inner surface defining a body lumen extending between the proximal and distal ends; a tubular needle comprising a proximal portion fixed relative to the catheter body and located within the body lumen, and a protruding portion extending distally beyond the distal end of the catheter body, wherein the needle further comprises: an outer surface having a diameter that is less than a diameter of an outer surface of the catheter body; and an inner surface defining a needle lumen in fluid communication with the body lumen, wherein a flow aperture in fluid communication with the needle lumen is provided along the protruding portion at or near a distal end of the needle; and a flow restrictor located within the needle lumen and fixed in position relative to the needle, the flow restrictor comprising a distal end positioned at or near the flow aperture.