Method and apparatus for inducing defibrillation in a patient using a T-shock waveform
AssigneeCameron Health, Inc.
InventorsAlan H. Ostroff, William J. Rissmann, Gust H. Bardy
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Abstract
A shock is delivered on the T-wave of a patient's cardiac waveform by first detecting the occurrence of a QRS complex in the waveform and using that detection to set up for detection of the following T-wave. Narrowband filtering is used to first select the QRS complex and thereafter the T-wave, while peak detection is employed to define the actual occurrence of the respective waveforms. The capability is also provided to deliver the shock at a manually selected interval after QRS detection or after a coupling interval in a pacing application.
Claims36
A method of delivering a T-shock comprising the steps of:
- automatically detecting the occurrence of a QRS complex;
- automatically detecting the occurrence of a T-wave following said QRS complex;
- and
- responding to the automatic detection of said T-wave to deliver a shock.
An apparatus comprising:
- a programmed digital processor;
- and
- programmed process steps executable by said digital processor to detect occurrence of a QRS complex and to detect occurrence of a T-wave following said QRS complex;
- wherein said programmed process steps are further executable to implement narrowband filtering to select the T-wave.
An apparatus comprising:
- means for detecting a QRS complex in a cardiac waveform;
- means responsive to detection of the QRS complex for detecting a T-wave following said QRS complex;
- and
- means responsive to detection of the T-wave form to deliver a shock.
An apparatus comprising:
- means for detecting a QRS complex in a cardiac waveform;
- and
- means responsive to detection of the QRS complex for detecting a T-wave following said QRS complex;
- wherein said means for detecting the T-wave employs narrow band filtering to select a T-wave component.
In a subcutaneous implantable cardioverter-defibrillator, the method comprising the steps of:
- automatically detecting the occurrence of a QRS complex;
- and
- responding to detection of the QRS complex by delivering a fibrillating shock to a patient;
- wherein said step of responding comprises the steps of:
- automatically detecting the occurrence of a T-wave following the QRS complex;
- and
- automatically delivering said shock in response to the automatic detection of the T-wave.
Dependencies are inferred from the claim text.