A needleless injector comprising: a body comprising a fluid chamber an outer shaft extending from an outer shaft proximal end at the body to an outer shaft distal end, the outer shaft comprising an outer shaft lumen between the outer shaft proximal end and the outer shaft distal end, to accommodate an injection shaft an injection shaft located within the outer shaft lumen and moveable lengthwise, rotationally, or lengthwise and rotationally, within the outer shaft lumen, the injection shaft comprising an injection shaft proximal end, an injection shaft distal end, an injection shaft terminus, and an injection lumen extending between the injection shaft proximal end and the injection shaft distal end, an injection orifice at the distal end of the injection shaft and in fluid communication with the fluid chamber through the injection lumen, the injection orifice being located on a proximal side of the injection shaft terminus and being directed away from the longitudinal axis of the injection shaft at the location of the injection orifice a pressure source in communication with the fluid chamber, the pressure source being capable of pressurizing fluid within the fluid chamber to an injection pressure capable of causing fluid ejected from the injection orifice to penetrate into tissue and an optical device that allows viewing a location at a distal end of the device.
