infant warmers are typically located in a neonatal unit of a hospital , and the neonatal unit typically has ceiling lights . further , an infant warmer may have a light that is used when medical personnel examine a baby . lights such as these shine into the eyes of the baby in the infant warmer and is believed to be an undesirable stimulus for the baby . with reference to fig1 an infant heater 10 is illustrated according to the present invention . infant heater 10 has a bed assembly a , a bed support b that holds and supports bed assembly a , and a support structure c , which holds a heat source h . a light shield 20 rests on bed assembly a , and light shield 20 can be adapted to reduce the amount of light that enters the eyes of a baby positioned below the light shield , thus protecting the baby from an undesirable stimulation . bed assembly a includes a bed 22 , which has a head end 22 a and a foot end 22 b . light shield 20 rests on or in bed 22 at head end 22 a . bed 22 has an upper surface 22 c , and a newborn infant , such as a baby born prematurely and having a low birth weight , would be placed on upper surface 22 a . the infant &# 39 ; s head would be placed towards head end 22 a , and the infant &# 39 ; s feet would be placed towards foot end 22 b . bed assembly a includes side panels 24 a , 24 b , 24 c and 24 d . side panels 24 ( suffixes omitted for simplicity ) help to hold heat within bed assembly a so that an infant resting on bed 22 will stay warmer . the infant is typically approximately centered between side panels 24 a and 24 c . light shield 20 is adapted to cover the head of the infant . in one embodiment , light shield 20 is made of a transparent plastic material such as an acrylic material . in this embodiment , an opaque blanket can be placed over light shield 20 to block a substantial portion of light from entering directly into the infant &# 39 ; s eyes . infant heater 10 has a light 28 held by support structure c . light 28 is generally left off , but turned on by a medical person using a switch 30 a in a control panel 30 . the medical person may activate light 28 by moving switch 30 a when examining the infant . the light from light 28 is believed to be an uncomfortable stimulation for the infant , so light shield 20 is preferably used when light 28 is on . light shield 20 may be used at any time , such as when ceiling lights are on , which light would travel into the eyes of the infant in infant heater 10 , except when light shield 20 is used to block the light . light shield 20 can have various configurations and can be made of various materials . light shield 20 is illustrated in fig1 as having opposing vertical sides 20 a and 20 b , each of which has a lower surface for contacting bed assembly a and holding light shield 20 in a stable position . extending from vertical members 20 a and 20 b , light shield 20 has angled members 20 c and 20 d that angle inwardly towards each other and above vertical members 20 a and 20 b . light shield 20 has an upper planar member 20 e , which is typically in an approximately horizontal plane while in use . angled members 20 c and 20 d join with and support planar member 20 e , holding planar member 20 e above upper surface 22 c of bed 22 . planar member 20 e has an inside upper surface 20 f that is sufficiently spaced from upper surface 22 c of bed 22 to accommodate the infant &# 39 ; s head . for example , vertical members 20 a and 20 b may extend upwardly a distance equivalent to the diameter of the infant &# 39 ; s head , or up to about two or three times that diameter , and angled members 20 c and 20 d may extend upwardly and inwardly so as to hold planar member 20 e at a distance spaced from the infant &# 39 ; s eyes . light shield 20 may be opaque and may be made of a metal or opaque plastic material , or it may be made of wood . in one embodiment , light shield 20 is made of a substantially transparent material , such as an acrylic material , and light shield 20 is covered by an opaque material , such as a baby blanket . any suitable opaque material can be used to cover light shield 20 so as to make it substantially impervious to light rays . light shield 20 can also be made of a thermally insulating material so as to help keep the infant warm by partially preventing heat loss from the infant &# 39 ; s head . in another embodiment , the light shield can be a frame for holding an opaque material , such as a blanket , and the frame may have no solid planar members . such a frame can be made of wire . bed 22 has a length between head end 22 a and foot end 22 b . light shield 20 is located toward head end 22 a and extends toward foot end 22 b . light shield 20 preferably covers enough of bed 22 so as to substantially block light from directly entering the infant &# 39 ; s eyes . at the same time , it is believed that a portion of upper surface 22 c should not be covered so as to provide access to the infant by medical personnel and / or to allow heat from heat source h to pass directly to the infant or upper surface 22 c of bed 22 . in one embodiment light shield 20 covers up to about 60 percent of the length of bed 22 . in other embodiments , light shield 20 covers between 10 and 50 percent of the length of bed 22 , 20 to 40 percent of the length of bed 22 , 15 to 35 percent of the length of bed assembly 22 , or about 25 percent of the length of bed 22 . with continued reference to fig1 bed support b of infant heater 10 includes a frame 40 , which has rails 40 a and 40 b connected together by a cross member 40 c . wheels or casters 42 are attached to frame 40 , which allow infant heater 10 to be rolled easily on a floor . a support column 44 extends upwardly from cross member 40 c of frame 40 . support structure c is secured to support column 44 . in the embodiment illustrated in fig1 support structure c extends upwardly from support column 44 , and bed assembly a is secured to support structure c , but other arrangements can be used . a cabinet 48 , which has drawers 50 a , 50 b and 50 c , is attached to support column 44 . bed assembly a has bed support arms 22 d and 22 e , which are secured to and extend from support structure c . temperature is regulated in bed assembly a for the infant using a temperature sensor ( not shown ) and a thermostatic control 30 b in control panel 30 . further details for making and using an infant heater are provided in the prior art , such as by u . s . pat . no . 5 , 474 , 517 , issued to falk et al ., and u . s . pat . no . 5 , 980 , 449 , issued to benson et al ., both of which are hereby incorporated by reference in their entirety for all purposes . turning to fig2 a light shield 60 is illustrated according to the present invention . light shield 60 is illustrative of one of many embodiments of a light shield according to the present invention . light shield 60 has vertical support members 62 and 64 and a semi - circular structure 66 joined with vertical support members 62 and 64 . a semi - circular member can be used without straight or vertical members . semi - circular structure 66 has an inside surface 66 a , which should be adequately spaced from an infant &# 39 ; s head that is covered by the light shield . for example , the light shield should be adequately spaced to allow the infant to breathe properly . a light shield according to the present invention can be made by heating and bending a sheet of plastic of a desired size to provide a lower surface that can rest on or in a bed assembly of an infant warmer or can be attached to the bed assembly of an infant warmer . the sheet of material is preferably substantially ductile and malleable . one can start with a rectangular sheet of material , possibly having a thickness ranging between about one - eighth of an inch to about one - half of an inch . the sheet of material can be bent and / or rolled so that it has an upper inside surface when placed in an orientation illustrated in fig1 or 2 . with the sheet bent or rolled so as to have at least two lower contact surfaces capable of resting on a planar surface , an inside upper surface of the light shield should be between about five and about thirty inches above the planar surface , preferably between about ten and about twenty inches above the planar surface . the size and shape of the light shield should be adapted to accomplish the purposes outlined herein . a light shield according to the present invention can be placed on or off of a bed assembly , depending on whether its use is desired at a particular time . alternatively , the light shield can be secured to the bed assembly or to a different portion of the infant heater so as to block light from entering an infant s eyes or to support an opaque material that substantially blocks light from entering an infant &# 39 ; s eyes . the infant heater and the light shield of the present invention operate to reduce undesired light stimulation to the eyes of an infant , particularly a premature baby having a very low birth weight and susceptible to distress caused by light entering the eyes . it is believed that the present invention provides a healthier and more soothing environment for a newborn baby that requires hospital care . while the present invention has been shown and described in its preferred embodiment and in certain specific alternative embodiments , those skilled in the art will recognize from the foregoing discussion that various changes , modifications and variations may be made thereto without departing from the spirit and scope of the invention as set forth in the claims . hence , the specific embodiments and any specific components and the like are merely illustrative and do not limit the scope of the invention or the claims herein .
an infant warmer has a bed assembly for supporting a baby born prematurely and a heat source with controls capable of maintaining the infant &# 39 ; s body temperature within a desired range . the bed assembly is suitably supported to hold the infant at a convenient elevation . a light shield rests on the bed assembly and is adapted to block light from directly entering the eyes of the infant .