Implantable medical device having an accelerometer
First Claim
1. An implantable medical device comprising:
- a housing adapted for implantation in a subject;
an accelerometer mounted in said housing for detecting vibrations of said housing, said accelerometer generating a vibration signal, having an amplitude and a frequency, in response to said vibrations; and
a signal processing unit in said housing, supplied with said vibration signal, which generates, for a number of predetermined frequency ranges, respective parameter values indicative of a predetermined attribute of said vibration signal, and which calculates a ratio of any two of said parameter values, and which emits, dependent on said ratio, at least one of a number of predetermined status values respectively indicating different predetermined cardiac activities.
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Accused Products
Abstract
An implantable medical device has a housing containing an accelerometer which detects vibrations of the housing. The accelerometer generates a vibration signal in response to the detected vibrations, which is supplied to a signal processing unit. The signal processing unit generates, for each of a number of predetermined frequency ranges, a parameter value indicative of a defined attribute of the vibration signal. The signal processing unit forms a ratio between any two of these parameter values, and emits at least one status value dependent on this ratio. The status value is uniquely indicative of a predetermined type or level of cardiac activity, and the status values can be used as a control signal for controlling therapy, such as cardiac stimulation, administered by the implantable medical device.
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Citations
18 Claims
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1. An implantable medical device comprising:
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a housing adapted for implantation in a subject; an accelerometer mounted in said housing for detecting vibrations of said housing, said accelerometer generating a vibration signal, having an amplitude and a frequency, in response to said vibrations; and a signal processing unit in said housing, supplied with said vibration signal, which generates, for a number of predetermined frequency ranges, respective parameter values indicative of a predetermined attribute of said vibration signal, and which calculates a ratio of any two of said parameter values, and which emits, dependent on said ratio, at least one of a number of predetermined status values respectively indicating different predetermined cardiac activities. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification