Sensing margin detectors for implantable electromedical devices
First Claim
Patent Images
1. An implantable electromedical device for developing predetermined control signals in response to sensed physiological reactions comprising:
- signal processing means coupled to receive signals corresponding to electrophysiological activity and to develop processed signals in response thereto, the signal processing means including a sensing detector for developing output signals corresponding to said processed signals;
means coupled to the sensing detector for establishing a threshold of response for said sensing detector, wherein the time duration of said output signal from said sensing detector corresponds to the time interval during which a processed signal exceeds said threshold level;
sensing margin means for determining a sensing margin as the level of said processed signals relative to said threshold; and
means for indicating the degree of difference between the processed signals and said threshold.
2 Assignments
0 Petitions
Accused Products
Abstract
Circuitry for quantitatively determining the level of processed heart signals relative to actual sensing sensitivity level (threshold) in an implantable pacemaker. The measurement is useful for adjusting the settable threshold, polarity, filtering or amplification parameter settings for safe operation and noise rejection of the pacemaker.
-
Citations
20 Claims
-
1. An implantable electromedical device for developing predetermined control signals in response to sensed physiological reactions comprising:
-
signal processing means coupled to receive signals corresponding to electrophysiological activity and to develop processed signals in response thereto, the signal processing means including a sensing detector for developing output signals corresponding to said processed signals; means coupled to the sensing detector for establishing a threshold of response for said sensing detector, wherein the time duration of said output signal from said sensing detector corresponds to the time interval during which a processed signal exceeds said threshold level; sensing margin means for determining a sensing margin as the level of said processed signals relative to said threshold; and means for indicating the degree of difference between the processed signals and said threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. An implantable device for controlling heart function comprising:
-
sensing means for detecting signals corresponding to heart activity; signal processing means for developing processed signals corresponding to detected heart activity signals; means for applying a predetermined threshold level to said processed signals in order to develop an output signal only in the event that a processed signal exceeds said threshold level, wherein the time duration of said output signal corresponds to the time interval during which a processed signal exceeds said threshold level; and sensing margin means responsive to said output signal for providing a measure of the extent by which a processed signal exceeds said threshold level, wherein said sensing margin means includes means for measuring the extent by which a processed signal exceeds said threshold level. - View Dependent Claims (18)
-
-
19. An implantable device for controlling heart function comprising:
-
sensing means for detecting signals corresponding to heart activity; signal processing means for developing processed signals corresponding to detected heart activity signals, wherein said signal processing means includes a combination of resistors and capacitors in a charge decay circuit; means for applying a predetermined threshold level to said processed signals in order to develop an output signal only in the event that a processed signal exceeds said threshold level; and sensing margin means responsive to said output signal for providing a measure of the extent by which a processed signal exceeds said threshold level, wherein said sensing margin means includes means for measuring the time during which the voltage of said charge decay circuit exceeds said threshold level.
-
-
20. An implantable device for controlling heart function comprising:
-
sensing means for detecting signals corresponding to heart activity; signal processing means for developing processed signals corresponding to detected heart activity signals, wherein said signal processing means includes sample and hold circuit means coupled to hold a processed signal for a time interval proportional to the amplitude of said processed signal; means for applying a predetermined threshold level to said processed signals in order to develop an output signal only in the event that a processed signal exceeds said threshold level; and sensing margin means responsive to said output signal for providing a measure of the extent by which a processed signal exceeds said threshold level.
-
Specification