US 4,537,201 A · Process and device for detecting the response of the heart to an electrical stimulation pulse

Abstract

The present invention relates to a process and device for detecting the response of the heart to an electrical stimulation pulse, comprising: collecting, after the end of the stimulation pulse, a first signal v which represents the electrode potential in open circuit and of which the variation in time t, from an original instant t.sub.o is of substantially logarithmic form: ##EQU1## v.sub.o being the value of v at instant t.sub.o and k being a parameter connected in particular with the duration and amplitude of the stimulation pulse, converting the first signal v into a second signal of which the variation in time is substantially linear and, detecting in said second signal a non-linear component representing the signal produced by the provoked contraction of the heart.

Claims13

Dependent claims

Process for detecting the response of the heart to an electrical stimulation pulse applied to an electrode in contact with the heart, by detection in a signal representing the potential of said electrode of a component produced by the provoked contraction of the heart, comprising the following steps of:

collecting, after the end of the stimulation pulse, a first signal v which represents the electrode potential in open circuit and of which the variation in time t, from an original instant t.sub.o is of substantially logarithmic form:
##EQU12## v.sub.o being the value of v at instant t.sub.o and k being a parameter connected in particular with the duration and amplitude of the stimulation pulse,
converting the first signal v into a second signal of which the variation in time is substantially linear and,
detecting in said second signal a non-linear component representing the signal produced by the provoked contraction of the heart.

1 more element

Device for detecting the response of the heart to an electrical stimulation pulse applied to an electrode in contact with the heart, by detection, in a signal representing the potential of said electrode, of a component produced by the provoked contraction of the heart, said device comprising:

a terminal for connection to an electrode to be placed in contact with the heart;
means for generating stimulation pulses;
a controlled switch connected between said generating means and said terminal for placing said electrode in open circuit in response to the reception of a control signal;
and
a detection circuit comprising an input circuit connected to said terminal for receiving a first signal representative of the electrode potential, said first signal varying in time substantially in logarithmic manner when said electrode is placed in open circuit after the end of a stimulation pulse, linearization means connected to said input circuit for receiving said first signal and converting said first signal into a second signal varying in time substantially in linear manner, and detecting means connected to said linerarization means and receiving said second signal for detecting therein a non-linear component representing the signal produced by a contraction of the heart responsive to a stimulation pulse.

2 more elements

Dependencies are inferred from the claim text.

Process and device for detecting the response of the heart to an electrical stimulation pulse

Life of this patent

Process and device for detecting the response of the heart to an electrical stimulation pulse

Life of this patent

Abstract

Claims13