Abstract: A new and useful contraceptive and prophylactic attachment having a dome shaped bowl which conforms to the shape of a portion of the penile glans surrounding the urethral orifice. The bowl has an aperture overlying the orifice which leads into a collapsed bladder contained within a protective retaining structure. During ejaculation, semen flows through the aperture into the bladder expanding it and causing it to extrude itself through an expandable outlet in the retaining structure. As a penile cap or micro-condom, the shape of the bowl and a layer of medical grade adhesive forms a leak-free seal between the attachment and the penis. The sensitive corona of the glans is left exposed.

Abstract: An apparatus for transmitting electrical current to a distal target via two concentric channels of electrically conductive gas. The conductive channels are created by multi-photon and collisional ionization along the paths of two concentric laser beams directed to the target. A pulsed high-voltage field traversed by the beams causes a current to flow along the channels of free electrons within the beams. The concentric channels are created by interposing a ring-shaped reflecting shield across a single laser beam. The pulsed high-voltage field is applied to two concentric electrodes made of conductive glass placed in the path of the concentric beams.