Medical device ECG marker for use in compressed data stream
First Claim
1. An Implantable medical device (IMD) having electrodes suitable for chronic contact with internal tissue in a living body so as to receive physiologically originated electrical signals via said contact, said IMD having a hermetically sealed housing through which said electrodes are connected to provide said physiologically originated electrical signals to at least one conductor inside said housing, said IMD comprising:
- an ECG sensing circuit inside said housing for receiving said physiologically originated electrical signals from said at least one conductor and for generating ECG sample signals having values representative of a feature in said physiologically originated electrical signals at a sampling rate, an activation triggering circuit inside said housing, also in electrical connection to said at least one conductor, for sensing a triggering event and for generating and providing as output, a trigger signal in the presence of triggering events, a memory circuit connected to receive data signals and to store or retrieve said data signals under control of a processor circuit, said processor circuit for reacting to said trigger signal to initiate storage into said memory of a group of said ECG sample signals as ECG data signals and for storing a triggering event signal as an additional data signal in said group of ECG sample signals as one data signal.
0 Assignments
0 Petitions
Accused Products
Abstract
Triggers and noise should be available as information in recorded electrograms in memories of implantable medical devices. Particularly where the recording of electrogram data is done in the far field, there will be considerable noise and the interpretation of ECG'"'"'s reproduced from such recorded data will benefit from the storing of information regarding contemporaneous noise. By storing contemporaneous trigger data and noise data directly in the ECG data, recordings of the ECG data become more useful for physician use when played back through an external display system with minimal loss of ECG data, since out of range values are employed for the noise and trigger information and this non-ECG data is limited in size to no longer than individual point values of the ECG signal.
65 Citations
34 Claims
-
1. An Implantable medical device (IMD) having electrodes suitable for chronic contact with internal tissue in a living body so as to receive physiologically originated electrical signals via said contact, said IMD having a hermetically sealed housing through which said electrodes are connected to provide said physiologically originated electrical signals to at least one conductor inside said housing, said IMD comprising:
-
an ECG sensing circuit inside said housing for receiving said physiologically originated electrical signals from said at least one conductor and for generating ECG sample signals having values representative of a feature in said physiologically originated electrical signals at a sampling rate, an activation triggering circuit inside said housing, also in electrical connection to said at least one conductor, for sensing a triggering event and for generating and providing as output, a trigger signal in the presence of triggering events, a memory circuit connected to receive data signals and to store or retrieve said data signals under control of a processor circuit, said processor circuit for reacting to said trigger signal to initiate storage into said memory of a group of said ECG sample signals as ECG data signals and for storing a triggering event signal as an additional data signal in said group of ECG sample signals as one data signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 30, 31, 32, 33, 34)
-
-
15. A method for recording noise signals contemporaneously with a recording of an ECG signal into a memory as a series of sampled values, responsive to a trigger signal, comprising:
-
monitoring an ECG input to find noise in an ECG input signal, generating a signal representing said noise found in said ECG signal, recording said signal representing said noise in an ECG data record memory, replacing one sampled value of the ECG data record with said signal representing said noise, where ECG data is recordable only within a limited range of available values and the noise signal is limited to values outside of the range of values forsaid ECG data.
-
-
23. A method for recording trigger signals contemporaneously with the recording of an ECG signal into a memory as a series of sampled values, responsive to a trigger signal, comprising:
-
monitoring an ECG input to find arrhythmia triggers in said ECG input, generating a trigger detected signal representing a finding of a predetermined pattern in said ECG input, recording trigger detected signal in an ECG data record memory by replacing one sampled value of the ECG data record with said trigger signal where ECG data is recordable only within a range and the trigger detect signal is limited to out of range values of said ECG data.
-
-
29. A method for recording noise and trigger signals contemporaneously with the recording of an ECG signal into a memory as a series of sampled values, responsive to a trigger signal, comprising:
-
monitoring an ECG signal to find noise in an ECG input signal, generating a signal representing said noise found in said ECG signal, monitoring an ECG signal to find arrhythmia triggers in said ECG input, generating a trigger detected signal representing a finding of a predetermined pattern in said ECG input, recording said signal representing said noise and said trigger detected signal in an ECG data record memory, replacing one sampled value of the ECG data record with said signal representing said noise and another sampled value of the ECG data record with said trigger detected signal, where ECG data is recordable only within a range and the signal representing said noise and the trigger detected signal are both limited to out of range values of said ECG data.
-
Specification