APNOEA ALARMS

• US 3,631,438 A
• Filed: 09/30/1969
• Issued: 12/28/1971
• Est. Priority Date: 10/31/1968
• Status: Expired due to Term

• Current Assignee: Lewin John Ernest
• Original Assignee: Lewin John Ernest
• Inventors: LEWIN JOHN ERNEST
• Application Number:
  US04/862,421
• Time in Patent Office: 819 Days
• US Class Current: 340/573.1
• CPC Class Codes: A61B 5/113 occurring during breathing
• CPC Class Codes: A61B 5/1135 by monitoring thoracic expansion
• CPC Class Codes: Y10S 5/94 with alarm means

Abstract

An apnoea alarm comprises a compartmented air mattress the individual compartments of which are connected to a common chamber containing a anemometer. The anemometer is connected to an electronic circuit which gives an alarm after a preset time if there is no airflow over the katherometer due to movement of the mattress caused by a breathing baby lying on it.

Claims

1. An apnoea alarm system comprising an air mattress having a plurality of separate compartments, air-connection means between said compartments, means for detecting differential changes in compression between different ones of said compartments, a sensory alarm, and a switch for operating the alarm in the absence of any change in compression of the mattress after a preset time period from a last detected change in compression.

2. The alarm system as claimed in claim 1 in which said air-connection means comprises a ducted outlet to each of said compartments and air connections between all said ducted outlets and in which the detection means comprises an anemometer for detecting airflow in any of the ducted outlets.

3. The alarm as claimed in claim 2 in which the ducted outlets are connected to a common chamber in which the anemometer is positioned.

4. The alarm as claimed in claim 2 in which the anemometer comprises a thermistor.