Abstract: A method and apparatus for accelerating osseointegration of titanium implants in bone to anchor a prosthetic or dental device thereon in which an alternating electric signal of symmetrical wave form and of substantially constant amplitude having a frequency in the range of from about 40 to 100 KHz and providing a constant current in the range of from about 10 to 100 microamperes is supplied to at least one electrode in contact with the metal implant and another electrode in contact with the skin in proximity to the implant.

Abstract: A host controller for producing data from a computer for a programmable filter of a hearing aid to cancel feedback in which phase shift and gain control means as adjusted by the computer to generate a feedback cancellation voltage which is supplied to the hearing aid for summation of the feedback and feedback cancellation voltages by the hearing aid and in which the summed feedback and feedback cancellation voltages are returned to the host controller for further adjustment of said phase shift and gain control means until feedback has been cancelled. The host controller then transmits to the programmable filter the phase shift and gain control data necessary to cancel feedback.

Abstract: A hearing aid system comprises a hearing aid that is programmable so as to have optimum electro-acoustic characteristics for the patient and acoustic environment in which it is used. Selected optimum parameter values are programmed into an electronically erasable, programmable read only memory (EEPROM) which supplies coefficients to a programmable filter and amplitude limiter in the hearing aid so as to cause the hearing aid to adjust automatically to the optimum set of parameter values for the speech level, room reverberation, and type of background noise then obtaining. The programmable filter may be a digital equivalent of a tapped delay line in which each delayed sample is multiplied by a weighting coefficient and the sum of the weighted samples generates a desired electro-acoustic characteristic. Alternatively, the programmable filter may be a tapped analog delay line in which the sum of the weighted outputs of the taps generates the desired characteristics.

Abstract: Audiometer apparatus comprises an electrostatic transducer having insulated electrodes for application to the skin on the head of a patient and driven by an ultrasonic frequency carrier signal generated in a series resonant circuit including the impedance of the body tissues between the electrodes, the carrier frequency being determined by the series resonant circuit. The amplitude of the carrier is modulated at an audio frequency, and operating parameters such as the magnitude of the current fed to the electrodes and the modulation frequency are controlled automatically in response to preselected values preset therein.Current and modulation frequency values are preset stepwise into a manually adjustable preselectors having detents formed by cooperating magnetic elements establishing successive rest positions corresponding to steps to which the preselector may be set.

Abstract: Body stimulator apparatus comprises a portable housing containing a signal generator that supplies a periodically varying treatment signal of ultrasonic frequency and given voltage and current to electrodes applied to a living body to be treated. A retrievable record of the time of treatment is stored in digital form and the voltage and current are sensed and analog representations thereof are fed to a normally disabled analog to digital converter. The converter is enabled by synchronizing pulses from a separate test instrument and the analog representations converted to digital form are latched and loaded into a shift register array with the stored record of the treatment time and shifted out therefrom serially to the test instrument by clock pulses generated by the latter.The test instrument is actuatable to generate the synchronizing and clock pulses required to enable the converter and actuate the shift register.

Abstract: Apparatus for stimulating osteogenesis in a living body comprises a portable, light weight, self-contained, low drain, battery powered stimulating instrument adapted to be carried by a patient during treatment for applying a high frequency alternating current treatment signal to the skin of the patient according to a treatment program and for generating a readable record of a parameter of the treatment signal during the treatment program, and a clinical control instrument in the custody of a person supervising the treatment program and connectable to the stimulation instrument when desired for monitoring the condition of the latter and for reading out data recorded therein during the treatment program.

Abstract: Apparatus for stimulating osteogenesis in a living body comprises a portable, light weight, self-contained, low drain, battery powered stimulating instrument adapted to be carried by a patient during treatment for applying a high frequency alternating current treatment signal to the skin of the patient according to a treatment program and for generating a readable record of a parameter of the treatment signal during the treatment program, and a clinical control instrument in the custody of a person supervising the treatment program and connectable to the stimulation instrument when desired for monitoring the condition of the latter and for reading out data recorded therein during the treatment program.