Title: Apparatus in medicine for the monitoring and or recording of the body movements of a person on a bed, for instance of a patient

Abstract: A capacitive motion sensor placed under a mattress or the like for monitoring the movements of a person. The sensor uses an active layer consisting of two courses of dielectric material placed in contact with one another. Movements of a person on top of the mattress cause the courses to move relative to one another, thereby generating an electric change in the active layer which is detected by a pair of spaced elements which form a capacitive antenna means.

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Inventors: Alihanka, Jukka (Littoinen, FI)
Vaahtoranta, Kaarle (Turku, FI)
Bjorkqvist, Stig-eyrik (Turku, FI)

Application Number: 06/128835
Filing Date: 1980-03-10
Publication_date: 1982-03-23
Assignee: INSTRUMENTARIUM OY

Primary Class(es): 600/484 600/595, 340/562, 361/283.100, 600/535
Other Classes: A61B5/113; A61B5/11; A61B5/10
US Patent Ref:

3572316	March, 1971	Vogelman et al.	128/671
3821491	June, 1974	Whetstone et al.	179/111E
3875481	April, 1975	Miller et al.	361/283	CAPACITIVE WEIGHING MAT
3926177	December, 1975	Handway et al.	128/722	Activity and respiration monitor
3991746	November, 1976	Hanna	128/722	Patient monitoring system and method
3996922	December, 1976	Basham	128/722	Flexible force responsive transducer
4152748	May, 1979	Arkans	361/283	Multiple transducer

Other Refs:
Primary Examiner: Michell, Robert W.
Assistant Examiner: Hanley, John C.
Attorney: Keil & Witherspoon

Claims:

We claim