System for monitoring a bed patient

• US 6,078,261 A
• Filed: 11/10/1998
• Issued: 06/20/2000
• Est. Priority Date: 11/10/1998
• Status: Expired due to Fees

• Current Assignee: Alert Systems Corporation
• Original Assignee: Alert Systems Corporation
• Inventors: Davsko, John L.
• Primary Examiner(s): Wu, Daniel J.
• Assistant Examiner(s): Nguyen, Tai T.
• Application Number:
  US09/189,385
• Time in Patent Office: 588 Days
• Field of Search: 340/573.4, 340/666, 340/539, 340/691.4, 340/691.5, 340/692, 340/529, 340/691.1, 340/571, 340/568, 340/572, 340/573, 200/85 R
• US Class Current: 340/573.4
• CPC Class Codes: A61B 2562/0247 Pressure sensors
• CPC Class Codes: A61B 2562/247 Hygienic covers, i.e. for covering the sensor or apparatus during use
• CPC Class Codes: A61B 5/1115 Monitoring leaving of a patient support, e.g. a bed or a wheelchair
• CPC Class Codes: A61B 5/6892 Mats
• CPC Class Codes: A61B 5/746 Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms alarms per se G08B
• CPC Class Codes: G08B 21/22 responsive to presence or absence of persons
• CPC Class Codes: G08B 25/10 using wireless transmission systems G08B25/009 takes precedence

Abstract

A monitoring system for a patient in a bed having a room number that provides a signal to a nurses station when the patient exits the bed including a sensor pad positioned on the bed responsive to the weight of a patient, a control unit adjacent the bed to which the sensor pad is connected, a display unit positioned adjacent the nurses station having a room number visual display and an audio signal generator and a radio signal transmitter in the control unit that transmits a radio signal upon actuation of the sensor pad and a radio receiver in the display unit that responds to sound an audio alarm and to visually display the patients room number.

Claims

1. A stand alone, wireless monitoring system for a patient in a bed having a room number that provides a signal to a remotely located nurses station when the patient exits the bed, comprising:

a sensor pad positioned on the bed responsive to the weight of a patient and providing a switch signal when at least a substantial portion of the weight of a patient is removed from the sensor pad;

a control unit adjacent the bed to which said sensor pad is connected;

a keypad connected as a part of said control unit by which the patients room number is programmed;

a display unit positioned adjacent a remotely located nurses station having a room number visual display and an audio signal generator; and

a radio signal transmitter in said control unit responsive to a switch signal from said sensor pad that transmits an electromagnetic signal upon actuation of said sensor pad, said remotely located display unit having means to receive said radio signal and in response thereto to sound an audio alarm and to visually display said room number, said sensor pads control unit, keypad, display unit and radio signal transmitter being isolated from and independent of any other nurses call system.

2. A monitoring system according to claim 1 including:

an audio message generator in said control unit responsive to said sensor pad switch signal providing an audio message commanding the patient to lie back down when said sensor pad first provides a switch signal.

3. A monitoring system according to claim 2 including a time delay circuit in said control unit that delays for a preselected time said transmission of said radio signal following said sensor pad signal to allow time to first provide said audio message commanding the patient to lie back down.

4. A monitoring system according to claim 3 wherein said time delay is such that transmission of said radio signal takes place only if the patient does not respond to deactivate said sensor pad within a preselected time following an audio command to lie back down.

5. A monitoring system according to claim 1 including on said keypad a HOLD key to deactivate said sensor pad switch signal to allow a patient to be absent from the bed without the transmission of a radio signal to said display unit.

6. A monitoring system according to claim 1 wherein said sensor pad is in the form of an elongated, relatively thin flexible strip having a pair of conductors extending therefrom and having means to provide a first signal when the weight of a patient is impressed on said strip and a second signal when the weight of a patient is removed from said strip.