Abstract: An improved peristaltic pump which provides for rotating the head an offset angle relative to the rotor center and which includes a pivoted housing structure that can be adjusted by a spring loaded set screw so as to vary the quantity of material pump. By adjusting the set screw, the spacing between the head and the rotor can be adjusted to vary the volume of the pump. A one-way clutch assures that fluid cannot be supplied in a reversed direction through the pump.

Abstract: A process for magnetically separating non-magnetic material from a mixture by combining the mixture with a magnetizing solution containing the salt of a magnetic element. The magnetic atoms attach to available sites on the molecules of the non-magnetic material so as to develop in that material a positive susceptibility. Thus the material is responsive to the influence of a magnetic field to move the material to a region where it can be analyzed or recovered. Materials with low positive or negative susceptibilities are separated by suspending them in a magnetic salt solution which when subjected to the attraction of a magnetic field develops a differential buoyancy force, pushing the diamagnetic or weak paramagnetic material strongly away from the magnet. Disclosed are solutions of ferric chloride, manganese chloride, erbium chloride, dysprosium chloride, terbium chloride, and holmium chloride.

Abstract: A method of and system for sonifying a portion of a given area to rid the area of unwanted pests comprising providing at least one ultrasonic point source each producing a set of pulsed signals having a randomly varying frequency in the range of about 18-30 KHz and having an intensity of at least 90 dB at the periphery of a cone shaped area extending outwardly therefrom and having a predetermined maximum length and a predetermined maximum width. The point sources are spaced in the given area to maintain the minimum sound intensity level at any point in the sonified portion at not less than 90 dB by disposing point sources opposite one another when the distance therebetween is greater the maximum length, disposing point sources adjacent one another to effect a longitudinal overlapping of adjacent cones when the room width is greater than the maximum width and disposing point sources perpendicular to the adjacent point sources to sonify any dead space therebetween.

Abstract: Apparatus and method for applying aspiration, irrigation, medication and ultrasonic power and dwell time to biotissue for surgery and treatment wherein the pressure for both aspirating and irrigating is precisely and accurately maintained by the use of a differential valve and a control reservoir which is generally much larger than the biotissue cavity to be operated on and wherein the pressures for irrigation, aspiration, medication and the application of the amplitude and dwell time of ultrasonic energy can be precisely controlled, externally, to the patient.

Abstract: Apparatus and method for applying aspiration, irrigation, medication and ultrasonic power and dwell time to biotissue for surgery and treatment wherein the pressure for both aspirating and irrigating is precisely and accurately maintained by the use of a differential valve and a control reservoir which is generally much larger than the biotissue cavity to be operated on and wherein the pressures for irrigation, apiration, medication and the application of the amplitude and dwell time of ultrasonic energy can be precisely controlled, externally, to the patient.

Abstract: Apparatus and method for measuring and indicating the true power in watts supplied to an ultrasonic handpiece and also to indicate the accumulative power applied to the handpiece.

Abstract: An improved oscillatory circuit in which the output of a radio frequency transformer is coupled from a half bridge squarewave amplifier to piezoelectric ultrasonic transducers through a serially connected feedback network. The feedback network employs a resistance connected in parallel with the serially connected combination of a capacitance, a feedback inductance and a feedback transformer. The improved feedback network provides a variable phase shift in feedback current to the half bridge squarewave amplifier tending to hold the frequency generated therein at a target frequency above anti-resonance.

Abstract: A machine for performing surgery and treatment utilizing ultrasonic energy wherein so as to obtain precise control of the operating frequency and eliminate unnecessary heating and loss of power the hand tool as well as the generator and power supply are designed after establishing the designed criteria of the particular medical tool required thus allowing coupling of energy into the tool in a very efficient manner. Means are also provided for assuring that dangerous transverse modes of the instrument used will not occur which can cause injury to patients. Several unique additional safety and construction features are also shown.

Abstract: A densimeter utilizes a low mass, neutral buoyancy float in association with a precision transducer which sense the deviation of the float position from a fixed neutral point corresponding to a predetermined fluid density within a range of fluid densities to be measured. The sensor output is accumulated and digitally added to a number corresponding to the predetermined density to thereby form an accurate representation of the fluid density.