Infant incubator

• US 5,730,355 A
• Filed: 08/27/1996
• Issued: 03/24/1998
• Est. Priority Date: 08/27/1996
• Status: Expired

• Current Assignee: Draeger Medical Systems Incorporated (Dragerwerk AG)
• Original Assignee: Hill-Rom Manufacturing Incorporated (Baxter International Inc.)
• Inventors: Lessard, Joseph J., Schumann, Peter, McDonough, Robert M., Wenstrup, Jan F.
• Primary Examiner(s): Bennett, Henry A.
• Assistant Examiner(s): BOLES, DEREK
• Application Number:
  US08/703,793
• Time in Patent Office: 574 Days
• Field of Search: 237/3, 237/14, 237/15, 454/195, 219/400, 219/385, 219/386
• US Class Current: 237/3
• CPC Class Codes: A61G 11/00 Baby-incubators; Couveuses
• CPC Class Codes: A61G 11/005 with movable walls, e.g. for accessing the inside, removable walls
• CPC Class Codes: A61G 11/009 with hand insertion windows, e.g. in the walls
• CPC Class Codes: A61G 2203/46 for temperature
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 2110/00 Control inputs relating to air properties
• CPC Class Codes: G05D 23/1931 to control the temperature of one space

Abstract

An infant incubator in which the heater for heating the air circulated through the incubator and the speed of the fan which forces air across the heater to circulate through the incubator are controlled to increase the temperature of the heated air and delivery of the heated air to the space in which an infant has been placed for treatment when an access door of the incubator has been opened. The increase in temperature and delivery of the heated air is caused by a sensor which senses when the access door is opened.

Claims

1. An infant incubator comprising:

a hood having an access door in a wall thereof;

a base upon which said hood is mounted and having a deck which with said hood defines an enclosure and has openings through which air enters and leaves said enclosure;

a heater within said base for heating the air;

a fan for supplying air to said heater and heated air from said heater into said enclosure through at least one of said openings and for returning air from said enclosure to said heater through at least one of said openings;

sensing means responsive to movement of said access door for sensing when said access door is opened; and

control means responsive to said sensing means for;

(a) increasing the heat generated by said heater, and

(b) increasing the speed of said fan when said access door is opened.

2. An infant incubator according to claim 1 wherein said sensing means include:

(a) a magnetic reed switch mounted to said base, and

(b) a magnet mounted to said access door of said hood movable with said access door into and out of the range of said magnetic reed switch.

3. An infant incubator according to claim 2 further including a first temperature sensor positioned in said enclosure for sensing the temperature of the air within said enclosure and a second temperature sensor adapted for attachment to the skin of an infant being treated in the incubator.

4. An infant incubator according to claim 3 wherein said control means are also responsive to said first temperature sensor and said second temperature sensor for controlling:

(a) the amount of increased heat generated by said heater and the time period over which said increased heat is generated, and

(b) the amount of increased speed of said fan and the time period said fan is operated at said increased speed.

8. An infant incubator according to claim 1 wherein:

(a) said access door is in a front wall of said hood,

(b) said hood has a second access door in a rear wall of said hood, and

(c) said deck has;

(1) openings extending along said from wall and said rear wall through which air enters said enclosure, and

(2) an opening extending along a third wall of said hood and through which air leaves said enclosure.

10. An infant incubator according to claim 3 further including:

(a) a third temperature sensor for sensing ambient temperature outside the incubator,

(b) an alarm indicator for developing an alarm indication when at least one of;

(1) a difference in actual infant skin temperature and a predetermined set point exceeds a predetermined threshold, and

(2) a difference in actual air temperature within said hood and a predetermined set point exceeds a predetermined threshold, and

(c) means responsive to said third temperature sensor for delaying an alarm indication by said alarm indicator by a time period dependent upon the ambient temperature if at least one of;

(1) a difference in actual infant skin temperature and a predetermined set point exceeds a predetermined threshold, and

(2) a difference in actual air temperature within hood and a predetermined set point exceeds a predetermined threshold,

exists and such difference is caused by the operator of the incubator changing operation of the incubator.

11. An infant incubator according to claim 3 wherein:

(a) said sensing means include a third temperature sensor for sensing ambient temperature outside the incubator, and

(b) said control means are responsive to said third temperature sensor for;

(1) controlling the heat generated by said heater, and

(2) controlling the speed of said fan

after said access door has been closed.

5. Apparatus for controlling the temperature of an infant incubator comprising:

a heater for heating air circulated within an incubator;

a fan for circulating heated air within the incubator;

sensing means responsive to at least one of;

(a) movement of an access door for sensing when the access door is opened,

(b) the temperature to which an infant being treated in an incubator is exposed, and

(c) the temperature of the skin of an infant being treated in an incubator; and

control means responsive to said sensing means for controlling;

(a) the heat generated by said heater, and

(b) the speed of said fan.

6. Apparatus according to claim 5 wherein:

(a) said sensing means include;

(1) a magnetic sensor responsive to movement of an access door of an incubator for sensing when the access door is opened,

(2) a first temperature sensor responsive to the temperature to which an infant being treated in an incubator is exposed, and

(3) a second temperature sensor responsive to the skin temperature of an infant being treated in an incubator, and

(b) said control means are responsive to;

(1) magnetic sensor for increasing;

(i) the heat generated by said heater, and

(ii) increasing the speed of said fan

when said access door is opened, and

(2) at least one of;

(i) said first temperature sensor, and

(ii) said second temperature sensor

for controlling;

(i) the amount of increased heat generated by said heater and the time period over which said increased heat is generated, and

(ii) the amount of increased speed of said fan and the time period said fan is operated at said increased speed.

7. Apparatus according to claim 6 wherein said magnetic sensor includes:

(a) a magnetic reed switch mounted to a base of an incubator, and

(b) a magnet mounted to an access door of an incubator and movable with the access door into and out of the range of said magnetic reed switch.

12. Apparatus according to claim 5 further including:

(a) a third temperature sensor for sensing ambient temperature outside an incubator,

(b) an alarm indicator for developing an alarm indication when at least one of;

(1) a difference in actual infant skin temperature and a predetermined set point exceeds a predetermined threshold, and

(2) a difference in actual air temperature within the hood of an incubator and a predetermined set point exceeds a predetermined threshold, and

(c) means responsive to said third temperature sensor for delaying an alarm indication by said alarm indicator by a time period dependent upon the ambient temperature if at least one of;

(1) a difference in actual infant skin temperature and a predetermined set point exceeds a predetermined threshold, and

(2) a difference in actual air temperature within a hood of an incubator and a predetermined set point exceeds a predetermined threshold,

exists and such difference is caused by the operator of the incubator changing operation of the incubator.

13. An infant incubator according to claim 5 wherein:

(a) said sensing means include a third temperature sensor for sensing ambient temperature outside the incubator, and

(b) said control means are responsive to said third temperature sensor for;

(1) controlling the heat generated by said heater, and

(2) controlling the speed of said fan

after said access door has been closed.

9. An infant incubator comprising:

a hood having a first access door in a from wall thereof and a second access door in a rear wall thereof;

a base upon which said hood is mounted and having a deck which with said hood defines an enclosure and has first and second openings extending along said from wall of said hood and said rear wall of said hood, respectively, through which air enters said enclosure and only one opening extending along a third wall of said hood through which air leaves said enclosure;

a heater within said base for heating the air;

a fan for supplying air to said heater and heated air from said heater into said enclosure through said first opening and said second opening and for returning air from said enclosure to said heater through said opening extending along said third wall;

sensing means responsive to movement of said first access door and movement of said second access door for sensing when either of said access doors is opened; and

control means responsive to said sensing means for increasing at least one of;

(a) the heat generated by said heater, and

(b) the speed of said fan

when either of said access doors is opened.

14. An infant incubator according to claim 9 wherein said sensing means include:

(a) a magnetic reed switch mounted to said base, and

(b) a magnet mounted to said access door of said hood movable with said access door into and out of the range of said magnetic reed switch.

15. An infant incubator according to claim 14 further including a first temperature sensor positioned in said enclosure for sensing the temperature of the air within said enclosure and a second temperature sensor adapted for attachment to the skin of an infant being treated in the incubator.

16. An infant incubator according to claim 15 wherein said control means are also responsive to said first temperature sensor and said second temperature sensor for controlling:

(a) the amount of increased heat generated by said heater and the time period over which said increased heat is generated, and

(b) the amount of increased speed of said fan and the time period said fan is operated at said increased speed.