Rate responsive heart stimulation device using neural network and IEGM classifier
First Claim
1. A method for setting a cardiac stimulation rate dependent on a workload experienced by a patient, comprising the steps of:
- obtaining a predetermined number of IEGM signals from a patient respectively while said patient is subjected to different workloads, each IEGM signal having an IEGM waveform associated therewith extending over at least one segment of one heartbeat cycle of said patient;
supplying said IEGM signals to a neural network and forming an encoded form of said IEGM waveforms using said neural network;
storing said encoded form of said IEGM waveforms in a memory;
obtaining subsequent IEGM signals, each subsequent signal having an IEGM waveform associated therewith, and using said IEGM waveforms in encoded form stored in said memory for classifying the respective waveforms of said subsequent IEGM signals to identify a current workload of said patient; and
administering pacing stimulation pulses to said patient at a stimulation rate matched to said current workload of said patient.
1 Assignment
0 Petitions
Accused Products
Abstract
In a method for classifying IEGM waveforms in dependence of the workload of a patient, a predetermined number of IEGM-signals, each signal extending over at least one segment of one heart beat cycle, are registered, whereafter the IEGM-signals are fed to a neural network and an encoded form of the signals is formed using said neural network. This encoded form is stored in a memory, for use in classifying further registered IEGM-signals. In an active cardiac implant connectable to an implantable electrode arrangement adapted for in vivo delivery of stimulation pulses to a heart, IEGM signals present are obtained from one or more of the electrodes. A pulse generator connected to the electrode arrangement, generates and emits stimulation pulses with a variable stimulation interval between successive stimulation pulses. The implant also contains a classifying device for classification of a predetermined number of IEGM-signals registered during predetermined time intervals at predetermined points of time according to a predetermined classification stored in the classification device, this classification being related to preregistered waveforms of measured IEGM-signals. A control unit in the implant supplies a control signal to a control input of the pulse generator dependent on the classification of each of the registered IEGM signals. The control signal causes the pulse generator to adjust the stimulation rate dependent on each of the registered IEGM-signals.
50 Citations
13 Claims
-
1. A method for setting a cardiac stimulation rate dependent on a workload experienced by a patient, comprising the steps of:
-
obtaining a predetermined number of IEGM signals from a patient respectively while said patient is subjected to different workloads, each IEGM signal having an IEGM waveform associated therewith extending over at least one segment of one heartbeat cycle of said patient; supplying said IEGM signals to a neural network and forming an encoded form of said IEGM waveforms using said neural network; storing said encoded form of said IEGM waveforms in a memory; obtaining subsequent IEGM signals, each subsequent signal having an IEGM waveform associated therewith, and using said IEGM waveforms in encoded form stored in said memory for classifying the respective waveforms of said subsequent IEGM signals to identify a current workload of said patient; and administering pacing stimulation pulses to said patient at a stimulation rate matched to said current workload of said patient. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A cardiac assist system for pacing a heart of a patient dependent on a current workload experienced by said patient, said system comprising:
-
a housing having a size and shape adapted for implantation in a patient; pulse generator means, disposed in said housing, for generating and emitting stimulation pulses with a variable stimulation interval between successive stimulation pulses, said pulse generator means having an output at which said stimulation pulses are present, and a control input; electrode means, connectable to said output of said pulse generator means, for delivering said stimulation pulses in vivo to the heart of said patient; monitoring means, contained in said housing and connected to said electrode means, for registering IEGM signals associated with said heart at different workloads and different stimulation intervals, each IEGM signal having an IEGM waveform associated therewith; memory means in said housing for storing a plurality of IEGM waveforms respectively associated with said IEGM signals at said different workloads and different stimulation intervals; classifier means, having access to said memory means and supplied with subsequent IEGM signals from said monitoring means, respectively obtained at predetermined points in time during a predetermined time interval, for classifying a predetermined number of said subsequent IEGM signals by classifying the IEGM waveforms respectively associated with said subsequent IEGM signals as matching an IEGM waveform in said memory means; and control means, contained in said housing and connected to said classifier means, for generating a control signal dependent on the classification of said subsequent IEGM signals and for supplying said control signal to said control input of said pulse generator means for varying the stimulation interval dependent on the workload associated with the subsequent IEGM signals. - View Dependent Claims (9, 10, 11, 12, 13)
-
Specification