Apparatus to indicate when a patient has evacuated a bed
First Claim
1. A monitoring system for a bed patient, comprising:
- (a) binary signal generating means (BSGM) adapted to provide a first signal when said patient is in the bed, and a second signal when said patient is out of said bed, the BSGM being in the form of switch means in a mat placed under said patient in said bed adapted to change from a first operating position to a second operating position responsive to the weight of said body on said mat in said bed;
(b) a frequency divider means for producing signal pulses at selected intervals of time;
(c) signal delay means responsive to said frequency divider means and said BSGM;
(d) latch means responsive to said signal delay means;
(e) alarm control means responsive to said latch means including means for selecting the nature of the alarm signal;
(f) alarm signal means;
(g) a time delayed hold flip-flop circuit means to reset said latch and provide for automatic resetting;
(h) said alarm control means including selectably (1) an astable flip-flop which provides a signal in the form of a series of square wave voltage pulses of selected duration as long as said latch means is closed, (2) a monostable flip-flop which provides a signal in the form of a single square wave voltage pulse of selectable length and (3) diode means connected to said latch means which provides a signal in the form of a continuous voltage signal existing until said latch is reset; and
(i) means to select one of said voltage signals for application to said alarm signal means.
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Abstract
A monitoring system for a bed patient comprising a binary signal generating means to provide a first signal when the patient is in the bed and a second signal when the patient is out of the bed. An alternating electrical power supply passes to a frequency divider so that electrical pulses of selected time spacing are derived by means of which time can be measured. These pulses go to a signal delay means with adjustments possible for any selected delay and then to a latch means. Alarm control means are provided responsive to the operation of the latch for controlling the nature of the alarm signal. The alarm control means alternately provides electrical alarm signals of various sorts, such as a single short pulse or an indefinitely long pulse or an alternating signal. Each of these could separately control a visual or audible alarm means. This invention is compatible with normal call equipment and alarms in hospitals.
100 Citations
2 Claims
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1. A monitoring system for a bed patient, comprising:
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(a) binary signal generating means (BSGM) adapted to provide a first signal when said patient is in the bed, and a second signal when said patient is out of said bed, the BSGM being in the form of switch means in a mat placed under said patient in said bed adapted to change from a first operating position to a second operating position responsive to the weight of said body on said mat in said bed; (b) a frequency divider means for producing signal pulses at selected intervals of time; (c) signal delay means responsive to said frequency divider means and said BSGM; (d) latch means responsive to said signal delay means; (e) alarm control means responsive to said latch means including means for selecting the nature of the alarm signal; (f) alarm signal means; (g) a time delayed hold flip-flop circuit means to reset said latch and provide for automatic resetting; (h) said alarm control means including selectably (1) an astable flip-flop which provides a signal in the form of a series of square wave voltage pulses of selected duration as long as said latch means is closed, (2) a monostable flip-flop which provides a signal in the form of a single square wave voltage pulse of selectable length and (3) diode means connected to said latch means which provides a signal in the form of a continuous voltage signal existing until said latch is reset; and (i) means to select one of said voltage signals for application to said alarm signal means. - View Dependent Claims (2)
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Specification