Abstract: The subject invention provides a safety pen needle assembly which includes: a hub; a needle carrier; a needle fixed to the needle carrier; a shield; and, a first engageable locking arrangement for fixing the shield to the needle carrier. Upon a predetermined extent of distal movement of the shield relative to the hub, the first locking arrangement is engaged such that the shield becomes fixed to the needle carrier. Upon further distal movement of the shield relative to the hub beyond the predetermined extent of distal movement, the shield and the needle carrier move in concert together relative to the hub causing a proximal end of the needle to move distally relative to the hub to a retracted state. Advantageously, the subject invention provides a reliable, low-cost safety pen needle assembly which does not require a spring or other biasing element.

Abstract: User-friendly attachment mechanisms for pen needles provide improved handling and ease of use, including locking installation and removal features and sensory feedback when a needle-bearing hub is seated on a pen. Embodiments include a needle-bearing hub includes a circumferentially oriented flexible tab that engages a radially inward rib on an outer cover to assist in attaching a pen device to the pen needle.

Abstract: A virtual market system is used to rank-order answers to an open-ended question. A virtual market on which participants can trade securities representing answers to the open-ended question is used to gather information from the participants regarding each answer. Answers to be traded on the market may be provided by the participants, allowing for opinions to be expressed not only as to the relative worth of the securities on the market, but also as to which securities should be on the market.

Abstract: A virtual market system is used to rank-order answers to an open-ended question. A virtual market on which participants can trade securities representing answers to the open-ended question is used to gather information from the participants regarding each answer. Additional securities representing additional answers to the question may be added during the trading period, allowing for the answers to the question to evolve over the operation of the market.