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.
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0. 24. An infant incubator comprising:
a deck, a hood defining an enclosure with the deck; at least one access door coupled to the hood for movement relative thereto between an open position and a closed position; a sensor operatively coupled to the access door and configured to indicate the position of the access door relative to the hood; and an electric fan configured to circulate air within the enclosure, the fan being operatively coupled to the sensor so that the fan operates at a fan speed.
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. 0. 33. An infant incubator comprising:
a hood having at least one access door in a wall thereof; a deck which with said hood defines an enclosure and openings through which air enters and leaves said enclosure; a heater; a first air passageway leading from the heater to at least one of the openings; a second air passageway extending from another one of the openings in the enclosure to the inlet of the heater; a fan in one of said passageways; an electric power source input connected to the fan through a control; a door position sensor coupled between said door and said control to activate the control when said access door is opened to increase the speed of said fan.
0. 17. 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 filled with air; openings through which air enters and leaves said enclosure; an electrical heating system within said base for supplying heated air into said enclosure through at least one of said openings to raise the temperature of the air within the enclosure and for returning air from said enclosure through at least one of said openings; and a source of electrical power connected to said electrical heating system when said access door is opened for increasing the rate of temperature increase of the air in the enclosure.
0. 35. Apparatus for controlling the temperature of an infant incubator comprising:
an incubator enclosure having at least one access door; a heater; a circulation passageway leading from the heater into the enclosure and from the enclosure into the heater; a fan in the circulation passageway; a power source input connected to the fan and heater through a control; the control connecting the power source to the fan and heater when at least one of: a) a door open or shut position indicator indicates the access door is opened; b) a first temperature sensor measuring the skin temperature of an infant in the enclosure sensing a temperature below that desired; and c) a temperature sensor measuring the temperature of the air in the enclosure below that desired. 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.
9. An infant incubator comprising:
a hood having a first access door in a front 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 front 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.
2. An infant incubator according to
(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
4. An infant incubator according to
(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.
6. Apparatus according to
(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
(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.
8. An infant incubator according to
(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 front 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
(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
(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. 12. Apparatus according to
(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
(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. 14. An infant incubator according to
(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
16. An infant incubator according to
(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.
0. 18. The incubator of
0. 19. The incubator of
0. 20. The incubator of
0. 21. The incubator of
0. 22. The incubator of
0. 23. The incubator of
0. 25. The infant incubator of
0. 26. The infant incubator of
wherein the magnet is positioned to lie adjacent to the magnetic reed switch when the access door is in the closed position, and wherein the magnetic reed switch is the control for the connection.
0. 27. The infant incubator of
0. 28. The infant incubator of
0. 29. The infant incubator of
a temperature sensor providing a temperature signal in response to the temperature of the air within the enclosure, a controller coupled to each of: the sensor, the temperature sensor, the heater, and the fan, and wherein the controller controls the heat generated by the heater and the speed of the fan in response to the position signal and the temperature signal.
0. 30. The infant incubator of
a third temperature sensor coupled to the controller and providing an infant temperature signal in response to the temperature of an infant being treated within the enclosure, and wherein the controller controls the heat generated by the heater and the speed of the fan in response to the position signal, the temperature signal, the ambient temperature signal, and the infant temperature signal.
0. 31. The infant incubator of
an alarm indicator coupled to the alarm control, and wherein the alarm indicator providing an alarm indication in response to the position signal, the temperature signal, the ambient temperature signal, and the infant temperature signal.
0. 32. The infant incubator of
0. 34. The incubator of
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The present invention relates, to infant incubators and, in particular, to apparatus for regulating the heating of the air which is circulated through an infant incubator and introducing the heated air into the space in which an infant is placed for treatment.
The most common way for regulating the heating of the air which is circulated through an incubator is to control the power delivered to the heater. An alternative approach, although not as common, is to control the speed of a fan which forces air across the heater and through the incubator. Typically, a temperature sensor, located in the space in which an infant is placed for treatment, and a temperature sensor, attached to the infant, serve as the control for establishing and maintaining the desired temperature of the air to which the infant is exposed.
Incubators have access doors which, when opened, permit access to an infant by those attending to the infant. When an access door is opened, the ambient air can enter the incubator space in which the infant has been placed and change the conditions of the air to which the infant is exposed. As a result, incubators have been arranged with openings extending along the access doors through which incubator air passes to develop warm air curtains which are intended to serve as shields to inhibit the ambient air from entering the space in which the infant has been positioned.
Some incubators are arranged to sense either the access door being opened or a change in temperature in the space in which the infant has been placed and change the heating and delivery of the air which is circulated through the incubator to compensate for the change in conditions by the entry of the ambient air.
An infant incubator, constructed in accordance with the present invention, includes a hood having an access door in a wall thereof and a base upon which the hood is mounted and having a deck which with the hood defines an enclosure. The deck has openings through which air enters and leaves the enclosure. Also included in this incubator are a heater within the base for heating the air and a fan for supplying air to the heater and heated air from said heater into the enclosure through at least one of the openings and for returning air from the enclosure to the heater through at least one of the openings. An infant incubator, constructed in accordance with the present invention, further includes sensing means responsive to movement of the access door for sensing when the access door is opened and control means responsive to the sensing means for increasing the heat generated by the heater and increasing the speed of said fan when the access door is opened.
Referring to
Deck 18 has openings through which air enters and leaves the enclosure. For the infant incubator illustrated in FIG. 1 and being described, access door 12 is in a front wall of hood 10 and the hood has a second access door 20 in a rear wall 22 of the hood. Deck 18 has openings 24 and 26 extending along front wall 14 and rear wall 22, respectively, of hood 10. As shown by the arrows in
When access door 12 is opened, the air passing through opening 24 in deck 18 forms a warm air curtain which serves as a barrier and reduces the effect of the ambient temperature outside the incubator on the enclosure defined by hood 10 and deck 18. Similarly, a warm air curtain is formed at opening 26 in deck 18 when access door 20 is opened.
An infant incubator, constructed in accordance with the present invention, preferably includes a first inner wall 30 and a second inner wall 31, respectively, secured to and movable with front access door 12 and rear access door 20. Inner walls 30 and 31 reduce radiant heat losses when the respective access doors are closed and serve to carry warm air, introduced through openings 24 and 26 in deck 18, to the top of hood 10 as indicated by the arrows.
An infant incubator, constructed in accordance with the present invention, also includes a heater within base 16 for heating the air circulated through the incubator and a fan for supplying air to the heater and heated air from the heater into the enclosure defined by hood 10 and deck 18 through at least one of the openings in the deck and for returning air from this enclosure to the heater through at least one of the openings in the deck. Referring to
An infant incubator, constructed in accordance with the present invention, also includes sensing means responsive to movements of access doors 12 and 22 for sensing when one or both of these access doors is opened, responsive to the temperature in the enclosure defined by hood 10 and deck 18 for measuring the temperature of this enclosure, and responsive to the skin temperature of an infant being treated in the incubator for measuring the skin temperature of the infant. These sensing means include, as shown in
Referring to
It is common practice to measure the temperature of the enclosure defined by hood 10 and deck 18 and the skin temperature of an infant being treated in an incubator and to use such temperature measurements to regulate the temperature in the enclosure.
An infant incubator, constructed in accordance with the present invention, also includes control means responsive to the magnetic sensor 40, 42 for increasing the heat generated by heater 32 and increasing the speed of fan 36 when an access door is opened. The control means are also responsive to the first temperature sensor 44 and the second temperature sensor 46 for controlling the amount of increased heat generated by heater 32 and the time period over which the increased heat is generated and the amount of increased speed of fan 36 and the time period the fan is operated at the increased speed.
Referring to
It is common practice to include in an infant incubator an alarm indicator when either the difference in actual infant skin temperature and a predetermined set point exceeds a predetermined threshold or the difference in actual air temperature within hood 10 and a predetermined set point exceeds a predetermined threshold. Typically, the alarm indication is delayed a prescribed period of time if the difference between the measured effect and the predetermined set point is due, for example, to a change caused by the operator of the incubator. For example, a significant drop in the skin temperature of the infant due to a change in the condition of the infant or a significant drop in the temperature of the air in the hood due to a failure in the air heating unit, each of which would cause the thresholds to be exceeded, should be alarmed immediately. In contrast, for example, opening an access door or raising the predetermined set point for the temperature of the air within the hood or raising the predetermined set point for the skin temperature of the infant, each of which can cause the difference in actual infant skin temperature and a predetermined set point to exceed a predetermined threshold or the difference in actual air temperature within the hood and a predetermined set point to exceed a predetermined threshold, should not be alarmed and would, in the absence of a delay in the alarm indication, indicate an alarm condition. Therefore, sufficient time is provided before an alarm condition is indicated for the incubator to stabilize when a condition, which might otherwise indicate an alarm condition, is created by the operator of the incubator.
Preferably, an incubator, constructed in accordance with the present invention, includes a third temperature sensor 52, shown in
In addition, ambient temperature sensor 52 can be used to control the heater 32 and fan 36 speed and this is indicated in
While there have been described preferred embodiments of the present invention, it should be obvious to those skilled in the art that various modification and changes can be made without departing from the true spirit and scope of the invention.
Wenstrup, Jan F., McDonough, Robert M., Schumann, Peter, Lessard, Joseph J.
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