Patent ID: 7942854

Claim:
A deflection catheter for delivery of a therapeutic agent to myocardial ischemic tissue, comprising: a first needle including a piercing tip and a shaft defining a needle axis, the shaft forming a lumen terminating at a shaft opening located at a side of the shaft; a distal section of the catheter configured for being steered through a body lumen, the distal section having a catheter axis and a terminal end forming an opening for passage of the first needle; a second needle located within the shaft lumen and placed in fluid communication with the therapeutic agent; a control unit configured to extend and withdraw the second needle from the shaft opening at an angle to the needle axis while the shaft opening is embedded within the myocardium and translate and rotate the first needle relative to the distal section; a sheath forming a lumen for passage of the first needle, the sheath having a distal end and an opening at the distal end for passage of the first needle; a helical anchor coupled to the distal end of the sheath for holding the catheter distal end at the myocardium wall; a deployment portion of the distal section for deploying the anchor, including an L-shaped cutout in the sheath including a first notch portion extending parallel to the needle axis and a second notch portion extending clockwise about the needle axis, the second notch portion including a first abutting surface, a needle guide extending transversely from the surface of the needle shaft and forming a second abutting surface, the guide sized for being received in the first and second notches, wherein the guide is capable of being removed from the L-shaped cutout by translation and counterclockwise rotation of the first needle by actuation of the control unit; a first configuration of the distal section including the guide being disposed within the second notch so that when the first needle is rotated clockwise by the control unit, thereby engaging the first and second abutting surfaces, the guide is retained within the second notch while the anchor is displaced distally and rotated clockwise with the first needle; and a second configuration of the distal section including the guide being disposed distally of the sheath opening to enable the first needle to translate or rotate without displacing the anchor.