Apparatus for in vivo intracardial of a measured signal corresponding to the physical activity of a subject and a heart pacemaker having a stimulation rate controlled thereby
First Claim
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1. An apparatus for in vivo intracardial acquisition of a measured signal corresponding to the level of physical activity of a subject, said apparatus comprising:
- first means for converting an electrical test signal into a first electrical signal component dependent on the blood oxygen content of said subject, the degree of dependence being dependent on the value of said test signal;
second means for converting said electrical test signal into a second electrical signal component dependent on the blood temperature of said subject, the degree of dependence being dependent on the value of said test signal;
said first means and said second means for converting being electrically combined in a circuit having only two terminals;
control circuitry coupled to said two terminals including drive circuit means for supplying said test signal to said first and second means for converting, and further including measuring means for generating a measured signal which includes said first and second signal components depending on blood oxygen content and blood temperature;
said test signal having a range of values including a first value below which said measured signal is significantly more dependent on blood temperature than on blood oxygen content and including a second value at which said measured signal is significantly more dependent on blood oxygen content than on blood temperature; and
means for adjusting said test signal to a value within said range including said first value and said second value.
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Abstract
An apparatus for the in vivo intracardial acquisition of a measured signal corresponding to the physical activity of a subject has an optoelectronic arrangement measuring the blood oxygen content of the subject and a temperature sensor for measuring the blood temperature. The apparatus can be operated so that a measured signal can be obtained which is optionally dependent on the blood oxygen content and the blood temperature, dependent only on the blood oxygen content, or dependent only on the blood temperature.
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Citations
20 Claims
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1. An apparatus for in vivo intracardial acquisition of a measured signal corresponding to the level of physical activity of a subject, said apparatus comprising:
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first means for converting an electrical test signal into a first electrical signal component dependent on the blood oxygen content of said subject, the degree of dependence being dependent on the value of said test signal; second means for converting said electrical test signal into a second electrical signal component dependent on the blood temperature of said subject, the degree of dependence being dependent on the value of said test signal; said first means and said second means for converting being electrically combined in a circuit having only two terminals; control circuitry coupled to said two terminals including drive circuit means for supplying said test signal to said first and second means for converting, and further including measuring means for generating a measured signal which includes said first and second signal components depending on blood oxygen content and blood temperature; said test signal having a range of values including a first value below which said measured signal is significantly more dependent on blood temperature than on blood oxygen content and including a second value at which said measured signal is significantly more dependent on blood oxygen content than on blood temperature; and means for adjusting said test signal to a value within said range including said first value and said second value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for in vivo intracardial acquisition of a measured signal corresponding to the level of physical activity of a subject, said apparatus comprising:
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first means for converting an electrical test signal into a first electrical signal component dependent on the blood oxygen content of said subject, said first means having a temperature coefficient associated therewith; second means for converting said electrical test signal into a second electrical signal component dependent on the blood temperature of said subject, said second means having a temperature coefficient associated therewith which is opposite in operational sign with respect to the temperature coefficient of said first means; said first means and said second means being electrically combined in a circuit having only two terminals; control circuitry coupled to said two terminals including drive circuit means for supplying said test signal to said first and second means, and further including measuring means for generating a measured signal which includes said signal first and second components depending on blood oxygen content and blood temperature; said test signal having a range of values including a single value at which the temperature influences of said first and second means cancel each other so that said measured signal is dependent on blood oxygen only, with said measured signal also being dependent on blood temperature at all other values in said range; and means for adjusting said test signal within said range including said single value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification