Abstract: A snare instrument, useful for snaring tonsils, polyps and the like, has an elongate rod which is slidably and rotatably mounted in an elongate tube. The distal end of the rod is adapted for attachment of a wire snare loop which is collapsed about the snared organ as the elongate tube moves outwardly along the rod over the snare wire loop. The proximal ends of the tube and rod are provided with an operating handle in which a first plate, mounted on the tube, has a pair of holes therein for receiving the index and middle fingers, while a second plate is carried on the rod and has a hole therein for receiving the thumb of a user. In contrast to other snare instruments, the tube is moved upwardly along the rod upon a parting of the thumb and fingers, rather than on a closing of the thumb and fingers.

Abstract: A high frequency power oscillator is keyed on and off to provide high frequency signal bursts under the control of a pair of timers whose duty cycles are simultaneously and proportionally adjusted so that the signal bursts are constantly centered about the peak power point regardless of variations of the duty cycles. The timers and related circuits for generating control signals are low voltage circuits, whereas the power oscillator is a high voltage circuit, a simple interface structure being provided therebetween.

Abstract: A high frequency power oscillator is keyed on and off to provide high frequency signal bursts under the control of a pair of timers whose duty cycles are simultaneously and proportionally adjusted so that the signal bursts are constantly centered about the peak power point regardless of variations of the duty cycles. The timers and related circuits for generating control signals are low voltage circuits, whereas the power oscillator is a high voltage circuit, a simple interface structure being provided therebetween.