Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1984-11-15
1986-06-10
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
307400, 310800, 340666, 128721, 128782, G08B 2100
Patent
active
RE0321800
ABSTRACT:
[The invention relates to a flexible composite sheet designed to constitute an undersheet behaving as an electromechanical transducer in order to detect the apnea of subjects lying on it. This sheet comprises, in addition to a foil sensitive to pressure in the sense of electromechanical transduction (an electret or polarized piezoelectric foil), two film electrodes and two protective foils. Spacing shims are glued to the two foils against which they are juxtaposed. When the sensitive foil is an electret, the shims are directly interposed between the sensitive foil and one of the two electrodes. When the sensitive foil is a polarized piezo-electric foil, the shims are directly interposed between one of the electrodes and the corresponding external protective foil.] An apnea monitor/alarm consists of an electronic monitor circuit to actuate an alarm responsive to the output of a sheet-like electromechanical transducer. The transducer consists of an electret or polarized piezoelectric foil responsive to pressure to generate corresponding electrical signals, two film electrodes, and two protective foils. Shims are glued to two of the foils for spacing. If an electret sensor foil is used, the shims are directly interposed between the sensitive foil and one of the electrodes. If the sensitive foil is a polarized piezoelectric foil, the shims are directly interposed between one of the electrodes and the corresponding external protective foil.
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Hennion Claude
Lewiner Jacques
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