摘要:
A method of communicating data between an external device and an implantable medical device wherein a first pulse is transmitted as electromagnetic energy from one device to the other, is received and stored as electrostatic energy in the second device and, after a delay period representing data to be communicated, the stored energy is released and transmitted as electromagnetic energy back to the first device. A communications circuit in the implantable device for accomplishing the method includes an antenna coil, a non-linear electronic component in circuit communication with the antenna coil, a storage capacitor in circuit communication with the antenna coil and non-linear electronic component for storing energy received by the antenna coil, and a switch for selectively connecting the charged storage capacitor and the antenna coil to discharge the charge stored in the capacitor into the antenna coil.
摘要:
An implantable defibrillator (10), which may include cardioversion and pacemaker capabilities, which has EMI filters (46, 54) which are not susceptible to defibrillation shocks and which reduce or eliminate the effects of charging noise on sensing circuits used for continuous confirmation. A first filter capacitor (104) is provided between a sense electrode, which may include pacing capabilities, and a ground reference (106) within a hermetically sealed can (66) containing a pulse/shock generator (62, 68). A second filter capacitor (112) is provided between a sensing/pacing reference electrode, which may also be a high voltage or shock electrode, and the ground reference (106). In addition, there is a third filter capacitor (108) between the ground reference and the can. Preferably, the connections of the first, second and third filter capacitors are physically as well as electrically adjacent to each other. The filter capacitors are housed in the can and in or adjacent to a feedthrough assembly which passes through the can. Most preferably, the filter capacitors are discoidal capacitors mounted in or adjacent to the feedthrough.
摘要:
An implantable defribillator with an optically-controlled high-voltage switch. A three-terminal high-voltage-tolerant semiconductor switch (88) exhibits high conductivity between its high-voltage terminal (HV) and its common terminal (COM) in response to a low control voltage applied between its control terminal (CRT) and its common terminal (COM), where the low control voltage exceeds a characteristic threshold value, and exhibits low conductivity between same where the control voltage is less than the characteristic threshold value. A photovoltaic coupler/isolator (82) having a light emitting device (90) and a photovoltaic device (92), optically coupled to and electrically isolated from each other, is in circuit communication across the control and common terminals. A low voltage current source (80) drives the light emitting device (90) of the photovoltaic coupler/isolator (82). A switch-off opto-isolator (84) having a light emitting device (94) and a light sensitive conductive device (96), optically coupled to and electrically isolated from each other, is in circuit communication across the control and common terminals of the semiconductor switch (88). A switch-off low voltage current source (86) drives the light emitting device (94) of the switch-off opto-isolator having a light sensitive conductive device, optically coupled and electrically isolated from each other, is in series circuit communication between the photovoltaic device and the semiconductor switch. A switch-on low voltage current source drives the light emitting device of the switch-on opto-isolator.
摘要:
A method of communicating data between an external device and an implantable medical device wherein a first pulse is transmitted as electromagnetic energy from one device to the other, is received and stored as electrostatic energy in the second device and, after a delay period representing data to be communicated, the stored energy is released and transmitted as electromagnetic energy back to the first device. A communications circuit in the implantable device for accomplishing the method includes an antenna coil, a non-linear electronic component in circuit communication with the antenna coil, a storage capacitor in circuit communication with the antenna coil and non-linear electronic component for storing energy received by the antenna coil, and a switch for selectively connecting the charged storage capacitor and the antenna coil to discharge the charge stored in the capacitor into the antenna coil.