Abstract: Ultrasonic apparatus for clot dissolution includes a radiator for coupling ultrasonic waves and a piezoelectric crystal, connected with said radiator, for the intravascular generation of ultrasonic waves; said ultrasonic waves being propagated along a longitudinal axis of said piezoelectric crystal. A seed liquid is introduced proximate the radiator for promoting cavitation of intravascular fluid. In addition, enhancement of clot dissolution by chemical agents is shown to be significantly increased when combined with ultrasonic energy.

Abstract: A system for monitoring and analyzing impurities in a liquid by analyzing the non-volatile residue of droplets of the liquid includes a droplet generator for generating a stream of droplets of the liquid, a droplet inspection unit, a drop-on-demand unit for removing selected droplets from the stream of droplets, a heat exchanger for drying the droplets to provide non-volatile residue particles, and a particle size measurement unit. The droplet inspection unit determines the diameters of the droplets. A feedback arrangement from the droplet inspection unit controls droplet diameter by varying the droplet generation rate. The drop-on-demand unit removes a selected fraction of droplets from the droplet stream so as to reduce vapor loading in the heat exchanger and prevent agglomeration of droplets. The heat exchanger includes a first section for gradually increasing the temperature of the stream of droplets and a second section for maintaining the stream of droplets at the boiling temperature of the liquid.

Abstract: Ultrasonic apparatus for clot dissolution and plaque ablation includes a radiator for coupling ultrasonic waves into plaque and a piezoelectric crystal, connected with said radiator, for the intravascular generation of ultrasonic waves; said ultrasonic waves being propagated along a longitudinal axis of said piezoelectric crystal and having an inertial node position within said piezoelectric crystal. The piezoelectric crystal is constructed in order to prevent significant power loss caused by a shifting of the inertial node of the generated ultrasonic waves to a position exterior to said piezoelectric crystal due to loading of the radiator caused by the coupling of ultrasonic waves into the clot or plaque.

Abstract: A torsional vibration drive for a laser gyro comprises a hub, spokes and an outer rim, with piezoceramics arranged on the spokes. Bending elements provided at the junction of the spokes and rim ensure high flexibility for rotations of the rim around the axis of rotation of the drive.

Abstract: Bumper apparatus for an automotive vehicle, comprises an elongate, hollow housing having opposite ends. The housing is adapted to be mounted adajcent to the end of a motor vehicle. A hinged door is mounted to at least one of the ends of the housing. An elongated container can be received in the housing for sliding in and out of the housing through the end of the housing having the hinged door.

Abstract: A delayed actuator mechanism with visco-elastic timer is provided including a support section and an actuator section mounted to the support section. A compression spring biases the actuator section in a first state and permits the actuator section to be selectively switched to a second state. In that state a cocked torsion spring urges a detent carried by the actuator into engagement with a shoulder of the support section to restrain the actuator section in the second state. A visco-elastic delay mechanism gradually relaxes the torsion spring until the compression spring overcomes the detent shoulder restraint to abruptly switch the actuator section to the first state.

Abstract: A visco-elastic actuator mechanism including a support section and an actuator section. A visco-elastic adhesive is mounted to one of the sections and is engageable by the other of the sections to hold the actuator in a first state. A spring urges apart one of the sections relative to the other until the actuator is abruptly switched to a second state.

Abstract: An aerosol dispenser including a nozzle chamber for holding fluid to be dispensed and a diaphragm forming at least a portion of the chamber and having an aerosol dispensing nozzle disposed therein. The chamber includes a nozzle region proximate the nozzle and a larger reservoir region interconnected to the nozzle region. There is a restrictive passage for introducing fluid from the reservoir region to the nozzle region and restricting backflow from the nozzle region to the reservoir region. A driver, typically a piezoelectric bender, is provided to drive fluid from the reservoir region to the nozzle region and from the nozzle region through the nozzle to create an aerosol spray.

Abstract: A pressure gauge including: a deformable element; a rigid guard element surrounding the deformable element to form an engagement face; and means for sensing the deformation of the deformable element as an indication of pressure.

Abstract: A non-vibrational oscillating blade piezoelectric blower is disclosed, including: a piezoelectric bender and means for supporting the piezoelectric bender at its inertial nodes. Weights may be attached to the bender to control the location of the inertial nodes. Flexible blades may be attached to the bender at various locations and with their planes in various orientations. The blower according to this invention may also consist of two benders oscillating 180 degrees out of phase to further minimize vibration and noise.

Abstract: A spinning rotor for use in an open end spinning device for producing twisted yarns, the spinning rotor being symmetrical about a longitudinal axis and comprising a body machined from a unitary piece of self-lubricating plastic. The body includes a peripheral wall which defines an exterior surface which is cylindrical with respect to the longitudinal axis of the rotor. A reinforcing rim having the shape of a right circular cylinder and defining an internal cylindrical wall is positioned in abutment with the cylindrical exterior surface of the peripheral wall to reduce deformation of the body when the body is subjected to centrifugal forces.