Implantable cardiac defibrillator employing a switched capacitor stage having a non-50/50 duty cycle
First Claim
Patent Images
1. An implantable medical device comprising:
- electrode means adapted for coupling to a patient'"'"'s heart;
sensing means having inputs connected to said electrode means for sensing cardiac electrical signals;
said sensing means including switched capacitor means having switches clocked by first and second control signals with a non-50/50 percent duty cycle;
said switched capacitor means comprising operational amplifier means having an inverting input terminal, a non-inverting input terminal and an output terminal;
said operational amplifier means having greater than 50 percent of the clock period to acquire a desired voltage on the output terminal and less than 50 percent of the clock period to hold the acquired voltage.
2 Assignments
0 Petitions
Accused Products
Abstract
An implantable cardiac defibrillator employing a switched capacitor stage wherein the switches are clocked in a non-50%/50% ratio such that an operational amplifier has greater than 50% of the clock period to acquire the desired voltage and less than 50% of the clock period to hold the acquired voltage, thereby allowing the circuit to run at an overall lower current drain.
-
Citations
8 Claims
-
1. An implantable medical device comprising:
-
electrode means adapted for coupling to a patient'"'"'s heart; sensing means having inputs connected to said electrode means for sensing cardiac electrical signals; said sensing means including switched capacitor means having switches clocked by first and second control signals with a non-50/50 percent duty cycle; said switched capacitor means comprising operational amplifier means having an inverting input terminal, a non-inverting input terminal and an output terminal; said operational amplifier means having greater than 50 percent of the clock period to acquire a desired voltage on the output terminal and less than 50 percent of the clock period to hold the acquired voltage. - View Dependent Claims (2, 3)
-
-
4. An implantable medical device comprising:
-
electrode means adapted for coupling to a patient'"'"'s heart; sensing means having inputs connected to said electrode means for sensing cardiac electrical signals; means for storing a charge; means for discharging said storage means to shock the heart via the electrode means; said sensing means including switched capacitor means formed of operational amplifier means and switch means, said switch means being clocked by first and second control signals with a non-50/50 percent duty cycle; said operational amplifier means having greater than 50 percent of the clock period to acquire a desired voltage and less than 50 percent of the clock period to hold the acquired voltage. - View Dependent Claims (5, 6)
-
-
7. An implantable medical device comprising:
-
electrode means adapted for coupling to a patient'"'"'s heart; sensing means having inputs connected to said electrode means for sensing cardiac electrical signals; said sensing means including switched capacitor means having switches clocked by first and second control signals with a non-50/50 percent duty cycle; and said first control signal having approximately a 30/70 percent duty cycle and said second control signal has approximately a 70/30 percent duty cycle.
-
-
8. An implantable medical device comprising:
-
electrode means adapted for coupling to a patient'"'"'s heart; sensing means having inputs connected to said electrode means for sensing cardiac electrical signals; means for storing a charge; means for discharging said storage means to shock the heart; said sensing means including switched capacitor means formed of operational amplifier means and switch means, said switch means being clocked by first and second control signals with a non-50/50 percent duty cycle; said first control signal having approximately a 30/70 percent duty cycle and said second control signal has approximately a 70/30 percent duty cycle.
-
Specification