A dual lumen coaxial introducer (16, 116, 216) for use with an elongate needle, comprising: a hub (28, 128, 228); an elongate member (30, 130, 230) having a first lumen (30-1, 130-1, 230-1), a second lumen (30-2, 130-2, 230-2), a proximal end portion (30-3, 130-3), and a distal end portion (30-4, 130-4), the proximal end portion (30-3, 130-3) being fixedly attached to the hub (28, 128, 228), the first lumen defining a longitudinal axis (18, 118) and configured to slidably receive the elongate needle; a pushrod (32, 132, 232) located in the second lumen (30-2. 130-2, 230-2), the pushrod (32, 132) having a distal end surface, the pushrod (32, 132, 232) being movable between a retracted position (32-5, 132-5) and an extended position (32-6, 132-6), wherein in the retracted position, the distal end surface (32-3, 132-3) of the pushrod (32, 132, 232) is spaced away from the distal end portion of the elongate member (30, 130) to define a marker recess (38, 138, 238) in the second lumen for carrying a tissue marker for delivery to a delivery site, wherein the hub includes a hub body having a side wall, a proximal end wall, and a distal end wall, the side wall defining a hollow interior and an exterior surface, and having a guide channel that extends through the side wall from the exterior surface to the hollow interior, the proximal end wall having a first hole, and the distal end wall having a second hole, the first hole of the proximal end wall configured to slidably receive the elongate needle and the second hole of the distal end wall configured to receive and mount the proximal end portion of the elongate member, wherein the dual lumen coaxial introducer further comprises: an actuator projecting outwardly from the guide channel and comprising of an engagement member positioned in the guide channel to extend into and through the hollow interior, and the actuator is configured to move the engagement member in the guide channel from an engaged position to a release position to facilitate movement of the pushrod from the retracted position to the extended position. a hub (28, 128, 228); an elongate member (30, 130, 230) having a first lumen (30-1, 130-1, 230-1), a second lumen (30-2, 130-2, 230-2), a proximal end portion (30-3, 130-3), and a distal end portion (30-4, 130-4), the proximal end portion (30-3, 130-3) being fixedly attached to the hub (28, 128, 228), the first lumen defining a longitudinal axis (18, 118) and configured to slidably receive the elongate needle; a pushrod (32, 132, 232) located in the second lumen (30-2. 130-2, 230-2), the pushrod (32, 132) having a distal end surface, the pushrod (32, 132, 232) being movable between a retracted position (32-5, 132-5) and an extended position (32-6, 132-6), wherein in the retracted position, the distal end surface (32-3, 132-3) of the pushrod (32, 132, 232) is spaced away from the distal end portion of the elongate member (30, 130) to define a marker recess (38, 138, 238) in the second lumen for carrying a tissue marker for delivery to a delivery site, wherein the hub includes a hub body having a side wall, a proximal end wall, and a distal end wall, the side wall defining a hollow interior and an exterior surface, and having a guide channel that extends through the side wall from the exterior surface to the hollow interior, the proximal end wall having a first hole, and the distal end wall having a second hole, the first hole of the proximal end wall configured to slidably receive the elongate needle and the second hole of the distal end wall configured to receive and mount the proximal end portion of the elongate member, wherein the dual lumen coaxial introducer further comprises: an actuator projecting outwardly from the guide channel and comprising of an engagement member positioned in the guide channel to extend into and through the hollow interior, and the actuator is configured to move the engagement member in the guide channel from an engaged position to a release position to facilitate movement of the pushrod from the retracted position to the extended position.