Protection against electromagnetic perturbations of external origin for a active implantable device
First Claim
1. An active implantable medical device comprising:
- a battery having a first voltage;
a microchip circuit having an electrode input port and a circuit element;
a power supply circuit, coupled to the battery first voltage, having a second voltage output and a third voltage output, the second and third voltages being greater than the first voltage;
a switch connected between said electrode input port and said circuit element having a first state and a second state to switch selectively the electrode input to the circuit element and a control input to select the switch state in response to the second and third voltages; and
a protection circuit connected to said electrode input port including at least one active component, the active component having a state that is responsive to an externally originated perturbation including a normal operating state in an absence of said perturbation and a protective operating state in the presence of said perturbation, wherein the protective operating state couples one of said second and third voltages to said switch control input and wherein the protection circuit, switch, power supply circuit and microchip further comprise a monolithically integrated circuit.
2 Assignments
0 Petitions
Accused Products
Abstract
An active implantable medical device, particularly a cardiac pacemaker or defibrillator, having a protection circuit that is effective against electromagnetic perturbations of external origin. The active implantable device is characterized in that at least all active components of the protection circuit (58, 60, 94, 98) are integrated components in a monolithically integrated microchip (16) including a control signal and circuits to commute selectively signals collected by external electrodes to the device for processing. In particular, the commutation circuits comprise static switches (24, 24'"'"', 28, 28'"'"', 38, 38'"'"', 40, 40'"'"', 44, 44'"'"', 46, 46'"'"', 50, 50'"'"', 54), and the control signal is a control voltage (VSUB, VCC) that is greater than the voltage (VPILE) of the battery of the device. The device delivers control logic signals (VDD, VSS) that are less than the battery voltage, and the protection circuit includes a voltage translator circuit (58) to raise, in absolute value, the logic control signal level to a value compatible with the static switches, control voltages and greater than the nominal level of parasitic voltages resulting from electromagnetic perturbations that are susceptible to appear on the static switch connection.
129 Citations
12 Claims
-
1. An active implantable medical device comprising:
-
a battery having a first voltage; a microchip circuit having an electrode input port and a circuit element; a power supply circuit, coupled to the battery first voltage, having a second voltage output and a third voltage output, the second and third voltages being greater than the first voltage; a switch connected between said electrode input port and said circuit element having a first state and a second state to switch selectively the electrode input to the circuit element and a control input to select the switch state in response to the second and third voltages; and a protection circuit connected to said electrode input port including at least one active component, the active component having a state that is responsive to an externally originated perturbation including a normal operating state in an absence of said perturbation and a protective operating state in the presence of said perturbation, wherein the protective operating state couples one of said second and third voltages to said switch control input and wherein the protection circuit, switch, power supply circuit and microchip further comprise a monolithically integrated circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
Specification