Apparatus for measuring the life functions of a human being, particularly an infant
First Claim
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1. An apparatus for monitoring at least one life function of a life form, comprising:
- a voltage source;
support means for supporting the life form including a resilient mat, a capacitance means mounted insulated in the mat connected to said voltage source and responsive to movements of the life form to produce life function signals representing such movements; and
a monitoring unit coupled to said capacitance means and includinga high-impedance first amplifier stage for receiving the life form signals, said high-impedance first amplifier stage having an input impedance on the order of 500K ohms or greater;
a second amplifier stage connected to said first amplifier stage for amplifying the life form signals by a first factor;
first filter means connected to said second amplifier stage for filtering out commercial supply hum and high frequencies at least above about 50 hz;
second filter means connected to said first filter means for filtering out any DC voltage components;
a third amplifier stage connected to said second filter means for amplifying the life form signals by a second factor;
third filter means connected to said third amplifier stage for filtering out commercial hum and high frequencies at least above about 50 hz; and
an image recognition and display means connected to said third filter means and operable to compare the life form signals to stored predetermined life form signals and produce an alarm when the current life form signals transgress a predetermined tolerance range.
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Abstract
A method and apparatus are provided for measuring life functions of a human being, particularly an infant, by way of a support acting on the basis of pressure changes as a life condition monitor which also comprises temperature sensors, humidity sensors, and the like and acts on the measuring and display device connected to the support and functioning in response to pressure changes. The method and apparatus are particularly characterized in that the support emits a signal which reflects the rib cage or, respectively, diaphragm motion during respiration and the motion of the cardiac muscles.
82 Citations
11 Claims
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1. An apparatus for monitoring at least one life function of a life form, comprising:
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a voltage source; support means for supporting the life form including a resilient mat, a capacitance means mounted insulated in the mat connected to said voltage source and responsive to movements of the life form to produce life function signals representing such movements; and a monitoring unit coupled to said capacitance means and including a high-impedance first amplifier stage for receiving the life form signals, said high-impedance first amplifier stage having an input impedance on the order of 500K ohms or greater; a second amplifier stage connected to said first amplifier stage for amplifying the life form signals by a first factor; first filter means connected to said second amplifier stage for filtering out commercial supply hum and high frequencies at least above about 50 hz; second filter means connected to said first filter means for filtering out any DC voltage components; a third amplifier stage connected to said second filter means for amplifying the life form signals by a second factor; third filter means connected to said third amplifier stage for filtering out commercial hum and high frequencies at least above about 50 hz; and an image recognition and display means connected to said third filter means and operable to compare the life form signals to stored predetermined life form signals and produce an alarm when the current life form signals transgress a predetermined tolerance range. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Apparatus for monitoring at least one life function of a life form, comprising:
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a voltage source; support means for supporting the life form including a resilient mat, a capacitance means mounted insulated in the mat connected to said voltage source and responsive to movements of the life form to produce life function signals representing such movements; and a monitoring unit coupled to said capacitance means and including a high-impedance first amplifier stage for receiving the life form signals, said high-impedance first amplifier stage having an input impedance of about 500K ohms; a second amplifier stage connected to said first amplifier stage for amplifying the life form signals by a first factor; first filter means connected to said second amplifier stage for filtering out commercial supply hum and high frequencies at least above about 50 hz; second filter means connected to first filter means for filtering out any DC voltage components; a third amplifier stage connected to said second filter means for amplifying the life form signals by a second factor; third filter means connected to said third amplifier stage for filtering out commercial hum and other high frequencies at least above about 50 hz; and a fourth amplifier stage connected to said third filter means for amplifying the life function signals by a third factor; a comparator connected to said fourth amplifier stage for comparing the life function signals to a predetermined reference and operable to produce an output signal when the life form signal transgress the reference; a relay operable to produce an alarm signal; and a relay drive connected between said comparator and said relay and including timing means causing integration of said output signals and operation of said relay when the integrated signal transgresses a reference level. - View Dependent Claims (8, 9, 10, 11)
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Specification