Patent ID: 8192399

Claim:
An injection catheter comprising: a catheter body; a tip section distal of the catheter body; a needle control handle proximal the catheter body, the needle control handle comprising: an outer body having a piston chamber therein; a piston having two ends, wherein one end of the piston is slidably mounted within the piston chamber; and an injection needle extending through the tip section, catheter body, and needle control handle, whereby longitudinal force applied to one of the outer body and the piston causes longitudinal movement of the injection needle to extend past the distal end of the tip section; wherein at least a portion of the piston has a threaded outer surface, and wherein the needle control handle further comprises: a thumb control rotatably mounted on the piston and having a threaded inner surface that interacts with the threaded outer surface of the piston; whereby rotation of the thumb control about the piston moves the position of the thumb control relative to the piston, and further whereby the position of the thumb control limits the longitudinal movement of the piston relative to the outer body, and a locking control rotatably mounted on the piston and having a threaded inner surface that interacts with the threaded outer surface of the piston, whereby rotation of the locking control about the piston moves the locking control toward the thumb control for friction-inducing contact with the thumb control to releasably lock the thumb control in a predetermined position on the piston.