A trocar comprises a retention cannula comprising an inverted or incised retention pattern disposed thereon. The dispenser mechanism has a spring element and a lever mechanism pivotally mounted in the dispensing zone. The device is propelled away from the thrower by holding the device in a compressed position with both hands and propelling the device away from the body of the thrower in a motion similar to a two-handed basketball pass, with a combination of the throwing force and the decompression of the spring determining the speed, distance and trajectory of the device.