Electronic patient monitor and white noise source

• US 6,897,781 B2
• Filed: 03/26/2003
• Issued: 05/24/2005
• Est. Priority Date: 03/26/2003
• Status: Expired due to Fees

• Current Assignee: Bed-Check Corporation (Stanley Black & Decker, Inc.)
• Original Assignee: Bed-Check Corporation (Stanley Black & Decker, Inc.)
• Inventors: Smith, Toby E., Cooper, Craig L.
• Primary Examiner(s): Lee, Benjamin C.
• Application Number:
  US10/397,126
• Publication Number:
  US 20040189475A1
• Time in Patent Office: 790 Days
• Field of Search: 340/573.1, 340/573.7, 340/686.1, 340/686.6, 340/517, 381/71.1, 600/28, 128/845
• US Class Current: 340/573.1
• CPC Class Codes: A61B 5/1118 Determining activity level
• CPC Class Codes: A61B 5/447 specially adapted for aiding the prevention of ulcer or pressure sore development, i.e. before the ulcer or sore has developed
• CPC Class Codes: A61B 5/6887 mounted on external non-worn devices, e.g. non-medical devices
• CPC Class Codes: A61B 5/6892 Mats
• CPC Class Codes: G08B 21/0423 detecting deviation from an expected pattern of behaviour or schedule
• CPC Class Codes: G08B 21/0446 worn on the body to detect changes of posture, e.g. a fall, inclination, acceleration, gait
• CPC Class Codes: G08B 21/0461 integrated or attached to an item closely associated with the person but not worn by the person, e.g. chair, walking stick, bed sensor
• CPC Class Codes: G08B 21/22 responsive to presence or absence of persons
• CPC Class Codes: G10K 11/17857 Geometric disposition, e.g. placement of microphones
• CPC Class Codes: G10K 11/17873 using a reference signal without an error signal, e.g. pure feedforward
• CPC Class Codes: H04K 2203/12 for acoustic communication
• CPC Class Codes: H04K 3/415 based on motion status or velocity, e.g. for disabling use of mobile phones in a vehicle
• CPC Class Codes: H04K 3/46 characterized in that the jamming signal is produced by retransmitting a received signal, after delay or processing
• CPC Class Codes: H04K 3/84 related to preventing electromagnetic interference in petrol station, hospital, plane or cinema

Abstract

According to a preferred embodiment, there is provided an electronic patient monitor for use in reducing the risk of decubitus ulcers. The monitor utilizes a separate sensor which senses the position of the patient in the bed or chair for purposes of determining when the patient moves. Additionally, the monitor broadcasts masking noise through its own, or through a remote, speaker, thereby enabling the patient to rest more comfortably in a noisy institutional environment. If the patient does not move on his or her own accord within a predetermined turn interval, the masking sound broadcast will be terminated which will gently encourage the patient to move. An alarm may additionally be sounded to notify the caregiver that the patient needs to be manually turned to reduce the risk of decubitus ulcers.

Claims

1. An electronic patient monitor for use with a patient sensor, said patient sensor at least for detecting a presence or an absence of a patient, comprising:

(a) a microprocessor in electronic communication with said patient sensor,

(b) program memory in electronic communication with said microprocessor, said program memory containing a plurality of computer instructions therein for use by said microprocessor, said computer instructions containing at least at plurality of instructions for

(b1) monitoring said patient sensor and initiating an alarm if the sensor indicates the absence of the patient, and,

(b2) generating at least one masking sound if the sensor indicates the presence of the patient;

(c) a speaker in electronic communication with said microprocessor, said speaker at least for broadcasting said at least one masking sound.

2. An electronic patient monitor according to claim 1, wherein said computer instruction for generating at least one masking sound, comprises at least a plurality of computer instructions for signaling to a sound source to generate said at least one masking sound.

3. An electronic patient monitor according to claim 1, further comprising:

(d) an amplifier in electronic communication with said CPU and with said speaker, said amplifier for amplifying said at least one masking sound for broadcast through said speaker.

4. An electronic patient monitor according to claim 1, wherein said computer instructions for generating at least one masking sound, comprise a plurality of computer instructions for generating white noise sounds.

5. An electronic patient monitor according to claim 1, wherein is provided a sound recording of ambient sounds from the patient'"'"'s home, and wherein said computer instructions for generating at least one masking sound, comprise a plurality of computer instructions for initiating a playback through said speaker of said sound recording of ambient sounds.

6. An electronic patient monitor according to claim 1, wherein said speaker is both for broadcasting said at least one masking sound and broadcasting said initiated alarm.

7. An system for reducing the risk of an occurrence of decubitus ulcers in a patient at rest on a support surface, wherein is provided a predetermined turn interval, comprising:

(a) a patient sensor, said patient sensor positionable to be proximate to the patient, said patient sensor at least for sensing at least approximately an orientation of the patient on the support surface and for generating at least one signal representative of said orientation of the patient on the support surface; and

,

(b) a patient monitor positionable to be in electronic communication with said patient sensor, said patient monitor comprising;

(b1) a microprocessor in electronic communication with said patient sensor,

(b2) a speaker in electronic communication with said microprocessor, said speaker positionable to be proximate to the patient;

(b3) program memory in electronic communication with said microprocessor, said program memory containing a plurality of computer instructions therein for use by said microprocessor, said computer instructions containing at least a plurality of instructions for

(i) monitoring said signal representative of said orientation of the patient on the support surface to determine an initial position of the patient,

(ii) generating a masking sound while monitoring said signal representative of said orientation of the patient,

(iii) transmitting said masking sound to said speaker,

(iv) broadcasting said masking sound within hearing range of the patient;

(v) determining a time since said initial patient position was determined,

(vi) performing steps (ii) through (v) at least until either said time since said initial patient position was determined exceeds said predetermined turn interval, or until the patient changes position from said initial position which ever occurs first, and,

if said time since said initial patient position was determined exceeds said predetermined turn interval, ceasing generation of said masking sound and generating an alarm after a predetermined time delay, and,

if the patient changes position from said initial position, redetermining said initial position and continuing to monitor the patient.

8. An electronic patient monitor according to claim 7, wherein said computer instructions for generating a masking sound, comprise at least a plurality of computer instructions for signaling to a sound source to generate said masking sound.

9. A method for reducing the risk of an occurrence of decubitus ulcers in a patient at rest on a support surface, comprising the steps of:

(a) selecting a turn interval;

(b) determining an initial position of the patient;

(c) generating a masking sound;

(d) broadcasting said masking sound within a hearing range of the patient, thereby enhancing the patient'"'"'s rest by making inaudible at least a portion of the ambient sounds otherwise audible by the patient;

(e) continuing to broadcast said masking sound within the hearing range of the patient while continuously monitoring the patient'"'"'s current position;

(f) determining a time since said initial position was determined;

(g) performing steps (c) through (f) at least until said time since said initial patient position was determined exceeds said predetermined turn interval; and

,

(h) if said current position of the patient is not substantially different from said initial condition, sounding an alarm to notify a caregiver that the patient needs to be turned and controlling the generation of said masking sound by either ceasing or continuing broadcast of said masking sound.

10. A method for reducing the risk of an occurrence of decubitus ulcers in a patient according to claim 9, wherein step (e) comprises

(h1) terminating the broadcast of said masking sound, and,

(h2) sounding an alarm to notify a caregiver that the patient needs to be turned.

11. A method for reducing the risk of an occurrence of decubitus ulcers in a patient according to claim 9, wherein is provided a predetermined time period, said predetermined time period being less than said turn interval, and wherein step (e) comprises:

(e1) continuing to broadcast said masking sound within the hearing range of the patient while continuously monitoring the patient'"'"'s current position if said time since said initial position was determined is less than said predetermined time period, thereby encouraging the patient to continue resting, and,

(e2) ceasing to broadcast said masking sound and continuing to continuously monitoring the patient'"'"'s current position if said time since said initial position was determined is greater than said predetermined time period and less than said turn interval, thereby encouraging the patient to change position.

12. A method of reducing the risk of an occurrence of decubitus ulcers in a patient, wherein is provided a patient sensor positionable to be proximate to the patient, said patient sensor at least for determining an approximate position of the patient, and wherein is provided a predetermined turn interval, comprising the steps of:

(a) determining an initial position of the patient from said patient sensor;

(b) beginning to broadcast a masking sound within hearing range of the patient;

(c) continuing to broadcast said masking sound while monitoring the patient'"'"'s position;

(d) determining a current position of the patient using said patient sensor and determining an elapsed time since said initial position of the patient was determined;

(e) comparing said initial position of the patient with said current position of the patient to determine if the patient has moved, and,

(i) if the patient has moved from said initial position, continuing to broadcast said masking sound while continuing to monitor the patient'"'"'s position,

(ii) if the patient has not moved from said initial position and said elapsed time is less than said predetermined turn interval, continuing to broadcast said masking sound while continuing to monitor the patient'"'"'s position, and,

(iii) if the patient has not moved from said initial position and said elapsed time is greater than said predetermined turn interval, sounding an alarm to indicate the patient needs to be turned and controlling the generation of said masking sound by either ceasing or continuing broadcast of said masking sound.

13. A method according to claim 12, wherein step (iii) comprises the step of:

if the patient has not moved from said initial position and said elapsed time is greater than said predetermined turn interval, ceasing to broadcast said masking noise and sounding an alarm to signal that the patient needs to be turned.

14. A method of reducing the risk of an occurrence of decubitus ulcers in a patient according to claim 12, wherein is provided a predetermined time period which is less than said predetermined turn interval, and wherein step (e)(ii) comprises the step of:

(1) if the patient has not moved from said initial position and said elapsed time is less than said predetermined turn interval and said elapsed time is less than said predetermined time period, continuing to broadcast said masking sound while continuing to monitor the patient'"'"'s position, and,

(2) if the patient has not moved from said initial position and said elapsed time is less than said predetermined turn interval and said elapsed time is greater than said predetermined time period, ceasing broadcast of said masking sound while continuing to monitor the patient'"'"'s position, thereby encouraging the patient to move.

15. An electronic patient monitor for use with a patient sensor, said patient sensor at least for detecting a presence or an absence of a patient, comprising:

(a) at least one microphone positionable to be proximate to said patient, said microphone for sensing ambient sounds proximate thereto,

(b) a microprocessor in electronic communication with said patient sensor and with said at least one microphone;

(c) a speaker in electronic communication with said microprocessors,

(d) program memory in electronic communication with said microprocessor, said program memory containing a plurality of computer instructions therein for use by said microprocessor, said computer instructions containing at least a plurality of real-time instructions for

(b1) monitoring said patient sensor and initiating an alarm if the sensor indicates the absence of the patient,

(b2) obtaining from said at least one microphone at least one input signal representative of said ambient sounds proximate to the patient,

(b3) using at least a portion of said at least one input signal to generate an output signal that at least in part interferes destructively with said input signal, and,

(b4) broadcasting said output signal via a speaker, thereby reducing the volume of the ambient noise proximate to the patient, and

(b5) controlling said broadcasting of said output signal based on the patient'"'"'s detected presence or absence.

16. An electronic patient monitor for use with a patient sensor, said patient sensor at least for detecting a presence or an absence of a patient, comprising:

(a) a patient detection circuit in electronic communication with said patient sensor, said patient detection circuit at least for

(a1) detecting a presence or an absence of a patient from the sensor,

(a2) initiating an alarm if the patient'"'"'s absence from the sensor is detected, and,

(a3) initiating the generation of a masking sound in response to the detection of the patient'"'"'s presence on the sensor;

(b) a masking sound generation circuit, said masking sound generation circuit being responsive to said patient detection circuit to produce at least one masking sound based on the patient'"'"'s detected presence or absence;

(c) a speaker in electronic communication with said masking sound generation circuit, said speaker at least for broadcasting said at least one masking sound.

17. An electronic patient monitor according to claim 16, wherein said patient detection circuit comprises:

(a1) a microprocessor in electronic communication with said patient sensor, said microprocessor containing a plurality of computer instructions therein, said computer instructions comprising at least a plurality of instructions for;

(i) monitoring said patient sensor and initiating an alarm if the patient sensor indicates the absence of the patient, and,

(ii) signaling to said masking sound generation circuit to begin the generation of said masking noise after detection of the patient'"'"'s presence upon the patient sensor.