Abstract: Acid and alkali oxides are smelted for an extended period of time at a first elevated temperature above their melting temperatures. The smelted mixture is then quenched in water and fritted. The fritted mixture is then disposed between a pair of members which are to be hermetically sealed relative to each other. The fritted mixture is then at least partially fused in an oxygen atmosphere at a second temperature below the first temperature for a relatively short period of time. The at least partially fused mixture is then rapidly cooled in air. In this way, the mixture is provided with a partially amorphous state and a partially crystalline state. The crystals in the mixture are disposed primarily at the borders of at least a particular one of the members to be sealed.The mixture hermetically seals the two members, is resistant to acids and alkalis and inhibits the propagation of cracks.

Abstract: A terminal is provided for introducing signals from an electrical terminal pin in a heart pacemaker to a terminal lead introduced into a patient's body. The terminal pin is disposed in a lid of the heart pacemaker so that the terminal pin is insulated from the lid. Means are also provided for introducing the signals on the terminal pin to the terminal lead without subjecting the pin to undue stresses.The terminal includes a hollow, electrically conductive ferrule disposed in concentric relationship with the terminal pin. The ferrule is provided with a flange which is disposed against the lid. An electrical filter is disposed in the ferrule and means are provided for maintaining the filter in fixed relationship to the ferrule and the terminal. Insulating means are provided for bonding the ferrule and the terminal. An inductance may also be included in the terminal and may be connected to the filter to enhance the filtering effect.

Abstract: A terminal is provided for introducing signals from an electrical terminal pin in a heart pacemaker to a terminal lead introduced into a patient's body. The terminal pin is disposed in a lid of the heart pacemaker so that the terminal pin is insulated from the lid. Means are also provided for introducing the signals on the terminal pin to the terminal lead without subjecting the pin to undue stresses.The terminal includes a hollow, electrically conductive ferrule disposed in concentric relationship with the terminal pin and attached to the lid. An electrical filter is disposed in the ferrule and is maintained in fixed relationship to the ferrule and the terminal. Insulating means are provided for bonding the ferrule and the terminal.An elongated sleeve is disposed on the ferrule and an insulating material is disposed between the terminal pin and the sleeve and is hermetically sealed to the terminal pin and the sleeve.