Abstract: Miniature pH indicator electrode assemblies (e.g., 10 mm. length) are provided for wire transmission. Also provided are dental assemblies containing such pH indicator electrode assemblies. The pH indicator electrode assemblies comprise micro pH indicator electrodes, wire transmission connector plugs, and heat shrinkable plastic housings. A moisture and ion impermeate, plastic seal intermediate the housing and both the electrode and the plug prevents moisture penetration therein. Dental assemblies containing such pH electrode assemblies are useful for the continuous measurement by wire transmission of pH changes in oral cavity fluids at both specific and non-specific sites.

Abstract: An implantable device for monitoring heart action or action of any other periodic-moving living organ or part of a living body. The device includes a piezoelectric energy converter which is driven by the adjacent moving tissue and which thereby generates electrical energy. The device also includes a pulse generator which in turn keys a radio transmitter circuit. The transmitter circuit is modulated during "on" periods by a signal from the organ being monitored, for example, an EKG signal from the patient's heart. The components are energized solely from the piezo-generated electrical energy. The rate and duration of the keyed bursts of modulated radio transmission depend on the amount of electrical power furnished by the converter. A method of using the device to monitor action of an organ such as the heart of a living body includes implanting the device, powering it from a pulsating portion of the body producing short, spaced r.f.

Abstract: A non-reacting implantable electric terminal for organic tissue, which is porous and intermeshes with the tissue including blood capillaries without the formation of a fibrous tissue encapsulation that reduces the sensitivity of tissue to electricity. This electric terminal is composed of tissue-compatible implantable material or materials at least one of which is electrically conductive, such as platinum, or an alloy, and which has on at least one surface thereof a porous material or layer having pores that are interconnected and continuous so that body electrolytes and/or tissue containing blood capillaries can contact the electrically conductive material through said porous material or layer. The pores of this material or layer also must have an average diameter sufficient to permit blood vessels to form in them, i.e. a diameter preferably between about 10 and 500 microns.

Abstract: A fluid and ion impermeable, durable, and substantially inert plastic composition containing at least about 50% by weight silicone and the remainder of a fluorocarbon and a wax. The fluorocarbon may be chemically combined or suspended as particles in the silicone, and the pores in the product are filled at least partially with a melted wax such as a natural wax like beeswax or a mineral wax as a micro-crystaline wax or even a synthetic wax as polyethylene. This composition or product is polymerized and/or vulcanized in a mold or the shape in which it is to be used with the aid of a catalyst and/or heat. The product also may contain inert fillers such as diatomaceous earth, silica and/or residues of the catalysts used in its vulcanization or final polymerization.