A model of cost-effectiveness and cost-utility of Implantable Cardioverter Defibrillators used for primary prevention in a UK context

A picking device for a water-jet loom comprises a nozzle body connected to a pressurized water source and provided with a plurality of axial nozzle holes, a plurality of spools fitted respectively in the axial nozzle holes and each provided with an axial through-hole through which to pass a weft yarn, a spool driving mechanism for individually or sequentially driving the spools for axial reciprocation or for turning alternately in opposite directions within a fixed angular range, and orifice chips having orifices defining straightening spaces for straightening the flow of the pressurized water around the front ends of the spools together with the circumferences of the front ends of the spools. A fluid passage connected to each of the orifices can be opened and closed by axial reciprocation or by turning alternately in opposite directions in the given angular range of the spool. The spools may be fixedly fitted in the axial nozzle holes, and the fluid passages connected respectively to the orifices may be opened and closed by a valve mechanism driven by a valve driving mechanism.