A mattress includes a head section, a seat section and first and second outer leg support sections. The seat section and the first and second outer leg support sections are configured to define a central opening therebetween. The mattress further comprises a removable center leg support section configured for movement between a first use position located within the central opening to provide a portion of the mattress and a second storage position detached from the mattress and located below the mattress. A drip flap is coupled to the seat section and first and second outer leg support sections of the mattress. The drip flap is configured to extend downwardly below a bottom surface of the mattress adjacent the central opening of the mattress. The mattress further includes a relatively rigid element secured to the drip flap to prevent the drip flap from folding upwardly when the removable center leg support section is moved from the storage position below the mattress to the use position within the central opening.

BACKGROUND AND SUMMARY OF THE INVENTION
 The present invention relates to mattresses for medical stretchers, and
 particularly relates to mattresses for medical stretchers used for
 patients requiring treatment or examination of the pelvic region, such as
 during labor and delivery or during gynecological examinations. More
 particularly, the present invention relates to mattresses for medical
 stretchers convertible between a conventional stretcher configuration that
 supports the patient in a recumbent position and an Ob/Gyn configuration
 that supports the patient in a parturition or lithotomy position providing
 medical caregivers improved access to the patient's pelvic region.
 Hospital emergency rooms and maternity units often receive patients that
 require handling in both a recumbent position and in a parturition or
 lithotomy position. For example, a maternity patient will typically remain
 in a recumbent position during labor, with her legs resting on a mattress
 surface, and then assume a parturition or lithotomy position to facilitate
 childbirth. During labor there often is also a need for the medical
 caregiver, such as a nurse or doctor, to have access to the patient's
 pelvic region, for example to assess cervical dilatation, after which time
 the patient again assumes a recumbent position. Patients and caregivers
 thus benefit from medical stretchers that both allows the patient to lie
 in a conventional, recumbent position and that convert to a configuration
 to support the patient in a parturition or lithotomy position while
 simultaneously providing the caregivers with improved access to the
 patient's pelvic region.
 An example of such stretchers is disclosed in detail in the aforementioned
 U.S. patent application Ser. No. 09/131,080. Such stretcher may
 illustratively comprise a base, a frame coupled to the base, and a deck
 coupled to the frame. The frame includes a storage compartment underneath
 the deck. The deck includes a head section, a seat section and first and
 second laterally spaced apart outer leg support sections adjacent the seat
 section. The seat section and the first and second outer leg support
 sections are configured to define a central opening therebetween.
 The stretcher also includes a removable center leg support section
 configured for movement between a first use position coupled to the deck
 and located within the central opening to provide a portion of the deck
 and a second storage position detached from the deck and located in the
 storage compartment below the deck.
 According to the present invention, a mattress, suitable for use with such
 stretchers, includes a head portion, a seat portion, and first and second
 outer leg support portions. The seat portion and the first and second
 outer leg support portions of the mattress are also configured to define a
 central opening therebetween. The mattress further comprises a removable
 center leg support portion configured to be disposed in the mattress
 central opening to provide a portion of the mattress. The head portion,
 seat portion, first and second outer leg support portions and removable
 center leg support portion of the mattress are configured to be located on
 the respective head section, seat section, first and second outer leg
 support sections and center leg support section of the deck. The mattress
 includes a drip flap coupled to a portion of the central opening defined
 by the seat portion and the first and second outer leg support portions of
 the mattress. The drip flap is configured to extend downwardly below a
 bottom surface of the mattress adjacent the mattress central opening. The
 drip flap reduces the exposure of the deck and the frame adjacent the
 mattress central opening to fluids when the center leg support section of
 the deck is in the stowed configuration in the storage compartment below
 the deck.
 In the illustrated embodiment, the first and second outer leg portions of
 the mattress each include a heel cut-out portion. The illustrated mattress
 further includes first and second foot straps coupled to the first and
 second outer leg support portions of the mattress respectively. The
 illustrated mattress additionally includes at least one fastener coupled
 to a bottom surface of the mattress to facilitate attachment of the
 mattress to the deck.
 The illustrated mattress also includes at least one bevel cut segment
 extending between a top surface and a bottom surface of the mattress. The
 first and second outer leg support portions are formed to include bevel
 cuts to facilitate access to a control handle when the mattress is
 positioned on the support deck.
 In an illustrated embodiment of the invention, the mattress further
 includes a relatively rigid element secured to the drip flap to prevent
 the drip flap from folding upwardly into the space between the seat
 portion and the center leg support portion of the mattress when the
 removable center leg support portion is moved from the storage compartment
 below the deck to the use position within the central opening of the
 mattress.
 In one illustrated embodiment, the drip flap comprises two outer segments
 coupled to the first and second outer leg support portions of the mattress
 and an inner segment coupled to the seat portion of the mattress. In this
 illustrated embodiment, the rigid element is secured to the portions of
 the inner and outer segments of the drip flap extending below the bottom
 surface of the mattress. The illustrated drip flap extends further
 downwardly below the bottom surface of the mattress adjacent the first and
 second outer leg support portions than adjacent the seat portion of the
 mattress.
 The rigid element illustratively includes a single rigid strip formed to
 follow the contour of the central opening adjacent the drip flap. The
 illustrated rigid element is located inside the inner and outer segments
 of the drip flap and attached thereto.
 The illustrated mattress includes first and second flexible portions
 coupled between the seat portion and the first and second outer leg
 support portions of the mattress, respectively, to permit relative
 movement between the first and second outer leg support portions and the
 seat portion of the mattress. In the illustrated embodiment, the head
 portion, seat portion, first and second outer leg support portions and
 removable center leg support portion of the mattress are all
 illustratively made from a first foam material, and the flexible portions
 of the mattress are illustratively made from a second foam material. The
 second foam material has a density less than the first foam material.
 According to another embodiment of the present invention, the drip flap
 includes two outer segments coupled to the first and second outer leg
 support portions of the mattress, two intermediate bevel segments coupled
 to the first and second flexible portions of the mattress and an inner
 segment coupled to the seat portion of the mattress. In this illustrated
 embodiment, the rigid element is secured to the portions of the inner,
 intermediate and outer segments of the drip flap extending below the
 bottom surface of the mattress. Also, in this embodiment, the rigid
 element, in the form of a single rigid strip configured to follow the
 contour of the mattress central opening adjacent the drip flap, is located
 inside the inner, intermediate and outer segments of the drip flap and
 attached thereto.
 Additional features of the invention will become apparent to those skilled
 in the art upon consideration of the following detailed description of the
 presently perceived best mode of carrying out the invention.

DETAILED DESCRIPTION OF DRAWINGS
 Although the specification of this application discusses the present
 invention in terms of a stretcher, the features have applicability in
 other patient support apparatus such as beds, tables, etc. a stretcher 10
 according to the present invention includes a base 12, a frame 14, a deck
 16, and a mattress 18, as shown for example in FIG. 1. Stretcher 10
 further includes a movable center leg support 17 that selectively can be
 coupled to deck 16 as shown for example in FIGS. 1-2 or stowed beneath
 deck 16 as shown in FIGS. 3-4. Deck 16, leg support 17, and mattress 18
 are configured to allow stretcher 10 to convert between a conventional
 stretcher configuration and an Ob/Gyn configuration in which a medical
 caregiver is provided with improved access to a patient's pelvic region.
 Deck 16 includes a head section 20, a seat section 22, and left and right
 outer leg sections 24, 26. Seat section 22 and outer leg sections 24, 26
 define between them an opening 15 configured to receive center leg support
 17. Head section 20 is pivotably coupled to seat section 22 by a pivot 28
 and outer leg sections 24, 26 are each pivotably coupled to seat section
 22 by hinge assemblies 30 that provide for rotation about two axes. Head
 section 20 can thus be rotated vertically with respect to seat section 22,
 as shown for example in FIG. 1 to elevate a patient's head. Outer leg
 sections 24, 26 can be rotated both horizontally and vertically with
 respect to seat section 22, as shown for example in FIG. 8.
 As discussed in more detail below, deck 16 is coupled for longitudinal
 movement with respect to frame 14. Briefly, deck 16 includes two
 downwardly extending lateral carriage plates 32 and two or three rollers
 34 coupled to each plate 32. Frame 14 includes two laterally spaced,
 longitudinally extending channels 36, 38 configured to receive rollers 34,
 a deck release mechanism 40 allows for selectively latching or unlatching
 frame 14 to deck 16 to enable or prevent relative longitudinal movement
 relative to deck 16. Deck 16 further includes a pair of gas/cylinders 42
 coupled between carriage plates 32 and deck head section 20 to allow for
 selectively adjusting an angle between head section 20 and seat section 22
 around pivot 28 through use of a release handle 44 coupled to the piston
 of cylinder 42.
 Channel 36 includes top and bottom flanges 33, 35 configured to retain
 rollers 34 against lateral movement as shown in FIG. 14. Top flange 33 has
 a downwardly extending lip 31 and bottom flange 35 has an upwardly
 extending lip 37 to provide channel 36 with a generally C-shaped or closed
 profile. Channel 38 includes flat top and bottom flanges 39, 41 to provide
 an open profile that allows for lateral movement of rollers 34 within
 channel 38. The complementary open and closed profiles of channels 36, 38
 reduces the tendency of rollers 34 to bind while deck 16 moves
 longitudinally with respect to frame 14.
 Base 12 includes four casters 46 and is coupled to frame 14 by hydraulic
 lifting mechanisms or supports 48, 50. Base 12 further includes foot
 pedals 52 for selectively raising or lowering either or both supports 48,
 50 so that stretcher 10 can be placed in a variety of orientations such as
 a Trendelenburg or reverse Trendelenburg position. Stretcher 10 has a head
 end 54 and a foot end 56 and includes a catch basin 62 coupled to frame 14
 at foot end 56, a combination bumper and push handle 58 at head end 54,
 and a side rail assembly 60.
 Channels 36, 38 are further used to facilitate tilting of frame 14 relative
 to base 12 as best shown in FIG. 22. Head end lifting support 48 is
 slidably coupled to frame 14 by a roller coupling assembly 49 fixed to
 head end support 48. Roller coupling assembly 49 includes a bar 47 (see
 FIG. 15) coupled to a top end of the support 48 and rollers 55 coupled to
 opposite ends of the bar 47. The rollers 55 are located in each channel
 36, 38. Foot end support 50 is coupled to frame 14 by a pivot assembly 51.
 Frame 14 is raised, lowered and tilted relative to base 12 by moving
 supports 48, 50 vertically up and down. When frame 14 is tilted to a
 Trendelenburg position (dotted position) as shown by arrow 57, the
 distance between rollers 55 and pivot assembly 51 increases by a distance
 53. In other words, as frame 14 tilts to the Trendelenburg position or
 reverse Trendelenburg position, rollers 55 move in the channels 36, 38
 toward head end 54. As discussed above, the complementary open and closed
 profiles of channels 36, 38 facilitates movement of rollers 55. It is
 understood that rollers 55 can be provided with separate channels to
 accommodate tilting frame 14, or roller assembly 49 can be replaced by
 other suitable mechanisms such as a hinged linkage assembly.
 Center leg support 17 is configured to be coupled to deck 16 within opening
 15 to provide for a conventional stretcher configuration as shown in FIG.
 2. Center leg support 17 illustratively includes a release handle 64
 coupled to a pair of cable assemblies 66 that control a pair of latching
 pins 68. Pins 68 enter holes 70 in seat section 22 of deck 16 to latch
 support 17 to deck 16. When release handle 64 is moved toward the foot end
 of stretcher 10 as illustrated by arrow 72, a linkage 74 causes cables
 within cable assemblies 66 to retract latching pins 68 from holes 70.
 Center leg support 17 can then be moved to the stowed configuration as
 shown in FIGS. 3-4 to allow stretcher 10 to assume an Ob/Gyn
 configuration. It is understood that any suitable mechanism for latching
 center leg support 17 in a conventional support position can be used.
 Similarly, release handle 64 and the associated components for releasing
 center leg support 17 for movement to the stowed position can be replaced
 by other suitable mechanisms. Center leg support 17 is illustratively
 formed from relatively light weight metal components including a tubular
 perimeter frame 76, longitudinal center support beams 78, and a sheet
 metal top surface 80.
 An alternative embodiment center leg support 117 is formed from molded
 plastic as shown in FIG. 21. Center leg support 117 includes a release
 handle 164, cable assemblies 166, and latching pins 168 that are similar
 to corresponding components of leg support 17. Center leg support 117 has
 a bottom surface 167 that includes a channel 170 extending longitudinally
 from release handle 164 and branching laterally towards latching pins 168
 for receiving cable assemblies 166. Recesses 172, 174 and plates 176, 178
 are provided to retain cable assembly 166 hardware from extending below
 the bottom surface 167 of center leg support 117. An ergonomic hand
 opening 180 is provided including finger grips 182 to facilitate operation
 of handle 164. Similar in operation to center leg support 17, when handle
 164 is moved in direction 184, latching pins 168 retract in direction 186
 to release the center leg support 117 from the holes 70 formed in the
 deck.
 Center leg support 117 further includes a pair of bottom supports 171 that
 extend downwardly from bottom surface 167 to provide support surfaces 179a
 and 179b that engage frame 14 when support 117 is in the conventional
 stretcher configuration. Support surfaces 179a and 179b extend below the
 bottom surface 167. a forward ramp surface 173 extends between bottom
 surface 167 and each support surface 179a and 179b. Guide surfaces 181 are
 located below bottom surface 167 and below support surfaces 179a and 179b.
 a forward ramp surface 175 and lateral ramp surface 177 extend between the
 bottom surface 167 and each guide surface 181. Ramp surfaces 173, 175, 177
 facilitate movement and alignment of support 117 when being moved from
 between the stowed position to a conventional stretcher configuration.
 Center leg support 117 is illustratively formed in a rotational plastic
 mold and is foam filled to produce a lightweight component with suitable
 rigidity, although it is understood that any conventional manufacturing or
 forming technique can be used.
 When center leg supports 17, 117 are positioned to provide a conventional
 stretcher configuration, latching pins 68, 168 extend into holes 70 and a
 top surface of center leg supports 17, 117 is generally flush with the top
 surfaces of seat and outer leg deck sections 22, 24, 26. a center leg
 support mattress 19 is configured to lie atop center leg supports 17, 117
 with a top surface of mattress 19 generally flush with a top surface of
 mattress 18. Frame 14 further includes a pair of center leg support pivot
 blocks 82 positioned above foot end hydraulic support 50 as shown in FIG.
 2. Pivot blocks 82 support the bottom of center leg supports 17, 117 when
 in the conventional stretcher configuration and, as discussed below,
 facilitate moving center leg supports 17, 117 between the conventional
 stretcher configuration and the stowed configuration.
 Center leg supports 17, 117 illustratively include a bottom U-shaped rod 84
 configured to define a rod pocket 86 between rod 84 and the bottom of
 center leg support 17, 117. Pivot blocks 82 each include an inwardly
 extending stop pin 88 that is retained within rod pocket 86 when center
 leg support 17, 117 is in the conventional stretcher configuration as
 shown in FIG. 3. As shown in FIG. 21, support surfaces 179a and 179b slide
 over pivot blocks 82 when center leg support 17 is moved from a stowed
 position to a conventional stretcher position. Outer guides 171 engage
 outer portions of the pivot blocks 82 to align the center leg support 117
 relative to the frame 14. Rod 84 engages stops 88 when the 117 leg support
 is moved fully toward the foot end of frame 14. Center leg support 117 is
 then pivoted around pivot blocks 82 until latch pins 168 engage apertures
 70 of frame 14. Center leg support 17 includes similar support surfaces 79
 and ramp surfaces 73 for engaging pivot blocks 82 as shown in FIGS. 3-5.
 Referring now to FIG. 3, when center leg support 17 is unlatched from deck
 14 by pulling handle 64 in direction 72 to retract pins 68, the foot end
 of center leg support 17 can be rotated upwardly in direction 90 so that
 the opposite end rotates downwardly in direction 92 as center leg support
 17 rotates about pivot blocks 82. a storage cavity 94 configured to
 receive center leg support 17 is defined between deck 16 and frame 14.
 After rotating center leg support 17 about pins 88, center leg support 17
 can be moved as shown by arrows 96, 98 in FIG. 3 to its stowed position
 within cavity 94 as shown in FIG. 4. Although the illustrated embodiments
 employ pivot blocks 82 and rod 84, it is understood that other suitable
 mechanisms can be used to facilitate moving center leg support 17 between
 the conventional stretcher and stowed configurations.
 Center leg support 17, 117 is moved from the stowed configuration to the
 conventional stretcher configuration by reversing the above-described
 steps. In this sequence, pivot blocks 82 guide movement of center leg
 support 17, 117 and also provide a stop to prevent center leg support 17
 from being pulled out past the point where it is rotated into the
 conventional stretcher configuration. This stop function is accomplished
 when pins 88 engage rod 84 to stop center leg support 17 from extending
 past the point at which it is rotated back up to couple to deck 16 in the
 conventional stretcher configuration.
 Deck release mechanism 40 illustratively is a cable-actuated mechanism and
 includes a lever 102 coupled to each of the deck outer leg sections 24, 26
 as best shown in the view of right outer leg deck section 26 in FIG. 6. As
 discussed in more detail below, a second cable-actuated mechanism coupled
 to levers 102 also enables horizontal rotation in hinge assembly 30 of
 outer leg deck sections 24, 26.
 Outer leg deck sections 24, 26 include gripping handles 104 that are
 coupled to deck sections 24, 26. Gripping handles 104 and levers 102
 provide an ergonomic mechanism that allows an operator to actuate levers
 102 while gripping handles 104. Pulling each lever 102 enables horizontal
 rotation of a respective one of outer leg deck sections 24, 26 about pivot
 connection 124 by releasing a mechanical lock 128 and also retracts a
 frame latching pin 106. When both levers 102 are pulled simultaneously,
 both frame latching pins 106 are retracted from apertures in the frame 14,
 and deck 16 can be moved longitudinally relative to frame 14 in the
 direction of arrow 103 as shown for example in FIG. 7. As discussed above,
 rollers 34 roll in channels 36, 38 as the deck 16 moves relative to the
 frame 14. Since both levers 102 adjacent handles 104 of outer leg deck
 sections 24, 26 must be activated to release the deck 16, a caregiver must
 be positioned at a foot end 56 of stretcher 10 to release the deck 16.
 This positioning of the caregiver provides improved control for movement
 of the deck 16.
 It is understood that levers 102 can be replaced by other suitable
 mechanisms, such as a single button or two buttons that perform the
 functions of enabling horizontal rotation of outer leg deck sections 24,
 26 and horizontal movement of deck 16 relative to frame 14. Furthermore,
 although center leg support 17 in the illustrated embodiment prevents deck
 16 from moving toward foot end 56 when stretcher 10 is in the conventional
 stretcher configuration, it is understood that alternative leg supports
 could be coupled to deck 16 to allow such movement.
 Each lever 102 is coupled to a control cable 108 that is coupled to frame
 latching pin 106. Frame latching pins 106 are each mounted to a bracket
 110 that is coupled to an inside wall 112 of deck carriage plate 32 so
 that latching pins 106 and brackets 110 move along with deck 16 relative
 to frame 14. Latching pins 106 are configured to enter holes (not shown)
 in channels 36, 38 to latch deck 16 in first and second predefined
 positions relative to frame 14. Pins 106 lock in a first pair of apertures
 in channels 36, 38 when the deck 16 is in a conventional stretcher
 position of FIG. 1. Pins 106 lock in a second pair of apertures formed in
 channels 36, 38 when the deck 16 is rolled to its examination position
 shown in FIG. 7. When lever 102 is pulled, cable 108 releases the pin 106
 from the channel 36 or 38 allowing the deck 16 to move relative to the
 frame 14. It is understood that other suitable mechanisms can be provided,
 such as a latching mechanism that provides for infinite longitudinal
 adjustment instead of predefined positions defined by holes in channels
 36, 38.
 As mentioned above, hinge assembly 30 of outer leg deck sections 36, 38
 provides for both horizontal and vertical rotation. Each hinge assembly 30
 includes a vertical pivot 112 and a horizontal pivot 114 as best shown in
 FIGS. 6 and 12-13. Vertical pivot 112 is formed by a horizontal pin 116
 coupled between an end of deck outer leg sections 24, 26 and hinge
 assembly bracket 118. a vertical adjustment cylinder 120 is pivotably
 coupled at one end to bracket 118 by connection 119. a piston 121 extends
 from each cylinder 120. a piston 121 is coupled to each outer leg section
 24, 26. An actuation button 122 underneath outer leg sections 24, 26 is
 pressed to release piston 121 to move within cylinder 120. Each outer leg
 section 24, 26 can be rotated vertically upon actuation of button 122 and
 is infinitely adjustable within its range of vertical rotation by
 releasing button 122 to lock the piston 121 and hold the leg section 24,
 26 at a desired orientation.
 Horizontal pivot 114 is formed by a vertical pin 124 coupled between hinge
 assembly bracket 118 and a bracket 126 mounted to deck seat section 22. a
 horizontal adjustment mechanical lock includes an outer cylinder 128
 pivotably coupled to seat section 22 by pivot pin 123 as shown in FIGS. 6
 and 13. a rod 125 moves back and forth within the cylinder 128 of the
 mechanical lock when an actuator 127 is released by control wire 109 when
 lever 102 is pulled. When lever 102 is released, the actuator holds the
 rod 125 in a locked position relative to cylinder 128. An end of rod 125
 is pivotably coupled to a flange of bracket 118 by pivot pin 129 as best
 shown in FIGS. 12 and 13. It is understood that other mechanisms for hinge
 assembly 30 can be provided, such as a single universal joint with a
 single actuation and latching mechanism for enabling rotation about two or
 more axes.
 Outer leg sections 24, 26 are surrounded by a flexible covering 132 that
 includes a generally bellows-shaped section 133 located over hinge
 assembly 30. Bellows 133 therefore permits pivotable movement of the leg
 sections 24, 26. Covering 132 also surrounds actuator 122 as best shown in
 FIG. 12. Covering 132 is illustratively formed from a rubber material,
 although it is understood that any suitable covering may be used. Covering
 132 facilitates cleaning of the outer leg sections 24, 26.
 Stretcher 10 includes removable calf supports 134 as best shown in FIG. 6.
 Support 134 includes a calf support tray 136 configured with a rounded
 perimeter 138, a concave calf support surface 140. a mounting rod 142 is
 coupled at one end to support tray 136 and has a generally spherical joint
 ball 144 at another end. Support 134 further includes a mounting shaft
 146, a raised gripping surface 148, an offset arm 150, and a joint socket
 152. Mounting shaft 146 is configured to be removably retained within a
 calf support socket 154 coupled to an outside surface of deck seat section
 22. Ball 144 and socket 152 provide for dual axis rotational adjustment of
 support tray 136 in directions 156, 158. Furthermore, rotation of mounting
 shaft 146 in direction 160 combined with offset arm 150 provides for a
 wide range of horizontal adjustment of calf support 134. When not in use,
 calf supports 134 are stored in a pair of storage receptacles 135 in frame
 14 as shown in FIG. 14. Receptacles 135 are formed from openings 137 in
 frame 14 that are spaced laterally inward from channels 36, 38. Mounting
 shafts 146 are inserted into openings 137, and L-shaped members 139 that
 extend longitudinally from atop openings 137 engage shafts 146 to retain
 calf supports 134 within frame 14.
 Stretcher 10 can thus be configured to provide improved access to a
 patient's pelvic region while supporting the patient in a lithotomy or
 parturition position as shown FIG. 9. An alternative embodiment calf
 support 234 is shown in FIG. 10. An outer leg deck section 224 includes
 top and bottom sections 225, 227 coupled by a pivot 229. Bottom section
 227 includes a plurality of notches 231 and top section 225 includes a
 hinged plate 233 so that when top section 225 is rotated upwardly in
 direction 235, plate 233 is rotated down to enter one of notches 231 to
 retain top section 225 at a desired angle with respect to bottom section
 227. An alternative handle 204 is configured to provide a foot support as
 shown in FIG. 1. a hinge 203 allows for rotating handle 204 upwardly in
 direction 205 to provide a support for a patient's foot. It is understood
 that other mechanisms can be provided to include a calf support within
 outer leg sections 24, 26, such as various linkage assemblies to adjust
 all or part of the deck section as required to conform to a desired
 orientation for calf support.
 Stretcher 10 can further be configured with an examination light system 190
 as shown in FIG. 15. Light system 190 illustratively includes a flexible
 connector 192 coupled to a light head 194. Once positioned, the flexible
 connector 192 holds the light head 194 at the foot end 56 of stretcher 10
 to allow for directing light in a convenient manner. Light system 190
 further illustratively includes a light source 196 coupled to frame 14
 adjacent head end 54 and a fiber-optic supply link coupled between cable
 192 and source 196. The light source 196 may also be coupled to the deck
 16 or base 12. It is understood that other suitable light systems can be
 used for light system 190, and that it can be attached or incorporated
 into frame 14 as desired. Stretcher 10 can be wheeled from place to place
 within a hospital or other facility. a particular room may not have
 adequate lighting for the stretcher 10. Since the light system 190 is
 incorporated into the frame of the stretcher 10, a suitable light source
 for examination is always available regardless of the location of the
 stretcher 10.
 The light source 196 includes a power cord (not shown) configured to be
 coupled to a power outlet of a wall. The light source 196 is coupled to
 the base 12, frame 14, or deck 16 at a location spaced apart from the
 central opening 15 formed in the deck 16. Therefore, the light source 196
 is located at a remote location from the area that is likely to be exposed
 to fluids during an examination or medical procedure. The light head 194
 is located adjacent the central opening 15 to provide light for the
 examination. The flexible connector 192 is configured to be received
 within a first receptacle 193 formed in the frame 14 to position the
 flexible connector adjacent the foot end of the frame 14. a retaining clip
 195 is configured to engage neck portion 197 of connector 192 to hold the
 light head 194 in a storage position when not in use.
 Mattress 18 as shown in FIGS. 17-20 is configured to be coupled atop deck
 16. Mattress 18 includes a head section 310, a seat section 312, and left
 and right outer leg sections 314, 316 that are sized to cover respective
 deck head, seat, and outer leg sections 20, 22, 24, 26. Head and seat
 sections 310, 312 are coupled by a V-shaped hinge 311 to facilitate
 rotation between them. Seat and outer leg sections 312, 314, 316 are
 coupled by soft foam portions 315 illustrated in FIGS. 18 and 19 that
 allow for both horizontal and vertical rotation over hinge assemblies 30.
 Seat and outer leg sections 312, 314, 316 define between them a center leg
 opening 318. Mattress 18 includes a drip flap 320 that extends downwardly
 around a portion of opening 318. Drip flap 320 reduces exposure of deck 16
 and frame 14 adjacent opening 318 to moisture when center leg support 17
 is in the stowed configuration. Drip flap 320 illustratively includes two
 outer segments 319, two bevel segments 321, and an inner segment 323 as
 best shown in FIGS. 16-17. Outer segments 319 illustratively extend
 downwardly farther than bevel and inner segments 321, 323. Drip flap 320
 in conjunction with catch basin 62 facilitates containment of fluids often
 encountered during procedures such as childbirth.
 Mattress 18 further includes heel cut-outs 322 and foot straps 324 in outer
 leg sections 314, 316. Cut-outs 322 provide a support surface for a
 patient's foot when outer leg sections 314, 316 are in a raised position,
 as shown for example in FIGS. 5 and 7. Mattress 18 illustratively includes
 foot end bevels 326 and head end bevels 328 as best shown in FIGS. 18-20
 and is formed with a foam core and a washable outer cover, although any
 suitable materials can be used. Foot end bevels 326 facilitate access to
 handles 104 as shown in FIG. 19. Mattress 18 further illustratively
 includes Velcro strips 330 on its bottom surface that couple to matching
 strips (not shown) on deck seat portion 22 to provide for removably
 coupling mattress 18 to deck 16.
 In operation, when a patient is first placed on stretcher 10, the stretcher
 10 is located in the conventional stretcher configuration illustrated in
 FIG. 1. The deck 16 can be articulated to adjust the position of the
 patient on the stretcher 10. When it is desired to move the stretcher to
 the OB/GYN configuration, a caregiver will typically first move the outer
 leg sections 24 and 26 upwardly relative to the seat section 22 by
 depressing buttons 122 beneath the outer leg sections 24, 26. This
 releases pistons 121 and permits the outer leg sections to be pivoted
 upwardly as shown in FIGS. 7-8.
 Next, the center leg support 17, 117 is stowed. To stow the center leg
 support 17, 117, a caregiver pulls the release handles 64, 164,
 respectively, toward the foot end 56 of stretcher 10. This releases pins
 68, 168 from apertures 70 formed in deck 16. Therefore, the center leg
 support 17, 117 can be pivoted downwardly about pivot blocks 82 as shown
 in FIG. 3. Center leg support 117 is then pushed toward the head end 54 of
 stretcher 10 in the direction of arrow 96 and arrow 98 of FIG. 3 to a
 storage position as shown in FIGS. 4 and 5.
 Next, the caregiver located at foot end 56 of stretcher 10 grips both
 handles 104 as shown in FIG. 8. Caregiver then actuates levers 102 by
 moving the levers 102 toward the foot end 56 of stretcher 10. Actuation of
 levers 102 simultaneously releases the latches 106 and mechanical locks
 128 coupled to control wires 108 and 109, respectively. When pins 106 are
 released from both sides of the deck 16, rollers 34 can roll in channels
 36, 38 toward the foot end 56 of the stretcher 10 to an examination
 position shown in FIG. 7. Pins 106 will latch into apertures in channels
 36, 38 to maintain the deck in the examination position shown in FIG. 7.
 Side rail 60 includes a padded bar 61 which is configured to provide a
 grip handle for the patient as best shown in FIG. 7. Illustratively, the
 grip handle is formed by a generally S-shaped section formed in the bar
 61. However, the padded grip handle may be formed on a straight tube or
 bar of the side rail.
 The caregiver can then adjust the leg sections 26 outwardly about pivot 24
 while levers 102 are actuated. In other words, the caregiver can move the
 leg sections 24, 26 to the dotted position shown in FIG. 8 to improve
 access to a pelvic region of the patient. Next, patient's legs can be
 adjusted using one of the various illustrated calf supports. The leg
 sections 24 and 26 and calf supports can be adjusted to a desired location
 throughout the examination.
 Once the procedure is over, the stretcher 10 can be converted back to a
 conventional stretcher configuration by the caregiver by gripping both
 handles 104 on outer leg sections 24, 26 and actuating levers 102. The
 outer leg sections 24, 26 are first adjusted to be parallel with the
 remainder of the deck 16 using levers 102 and actuator 122. Actuating
 levers 102 also release pins 106 from the first set of apertures formed in
 channels 36, 38 to permit the rollers 34 on deck 16 to roll in channels
 36, 38 back to the conventional stretcher position shown in FIG. 1. Pins
 106 then latch in the second set of apertures formed in channels 36, 38 to
 hold the deck 16 in the conventional stretcher configuration. Center leg
 support 17, 117 is then retrieved from the storage position as shown in
 FIG. 4. The caregiver pulls the center leg support 17, 117 outwardly in
 the direction of arrow 72 of FIG. 3 until the bar 84 latches over locking
 pins 88 of pivot blocks 82. The center leg support 17, 117 is then pivoted
 upwardly about pivot blocks 82 until pins 68, 168 engage apertures 70
 formed in deck 16 to lock the center leg support 17, 117, in position.
 It is understood that the locations of pins 68 and holes 70 could be
 reversed. In addition, latch pins 106 could be formed on the frame and
 configured to enter apertures formed in the deck. Other types of latches
 may also be used, if desired.
 Another aspect of the present invention is illustrated in FIG. 23. The side
 rail 60 includes a mounting rail 350 and an outer rail 352. The tubes or
 bars 61 of the side rail are pivotably coupled between the mounting rail
 350 and the outer rail 352. Swing arms 354 are mounted on each end of the
 side rails 60. Each swing arm 354 includes a first end pivotably coupled
 to the frame 14 at location 356 and a second end pivotably coupled to the
 mounting rail 350 at location 358. A separate side rail 60 is mounted on
 both sides of the frame 14 in a conventional manner.
 FIG. 23 also illustrates a cam 360 coupled to the carriage plate 32 of the
 deck 16. a cam 360 is coupled to carriage plates 32 on both sides of the
 deck 16. When the deck 16 slides toward the foot end of the frame 14 in
 the direction of arrow 362 as discussed above, the carriage 32 and the
 cams 360 also move in the direction of arrow 362. When the carriage 32 and
 cams 360 approach a foot end of the frame 14, the cams 360 engage the
 swing arms 354 of the side rail 60 to pivot the side rails 60 outwardly
 relative to the frame 14 in the direction of arrow 364 to the dotted
 location illustrated in FIG. 23. This movement of the side rails 60
 provides clearance to permit the deck 16 to continue to move toward the
 foot end of the stretcher 10.
 Still another aspect of the present invention is illustrated in FIGS.
 24-31. As shown in FIG. 24, the mattress 18' includes a head portion 410,
 a seat portion 412 and first and second outer leg support portions 414,
 416. The seat portion 410 and the first and second outer leg support
 portions 414, 416 of the mattress 18' are configured to define a central
 opening 418. The mattress 18' further comprises a removable center leg
 support portion 440 configured to be disposed in the mattress central
 opening 418 to provide a portion of the mattress as discussed above. The
 head portion 410, seat portion 412, first and second outer leg support
 portions 414, 416 and removable center leg support portion 440 of the
 mattress 18' are configured to be located on the respective head section
 20, seat section 22, first and second outer leg support sections 24, 26
 and center leg support section 17 of the deck 16. The head and seat
 portions 410, 412 are joined by a V-shaped hinge 411 to permit
 articulation of the head portion of the mattress. It will be noted that
 the mattress 18' shown in FIG. 24 is similar to the mattress 18 shown in
 FIG. 16. The like components in the two figures are identified by like
 numerals.
 The mattress 18' includes a drip flap 420 coupled to a portion of the
 central opening 418. The drip flap 420 is configured to extend downwardly
 below a bottom surface 438 of the mattress 18' adjacent the mattress
 central opening 418. The drip flap 420 illustratively includes two bevel
 segments 421 and an inner segment 423.
 A relatively rigid member 520 is located between first and second pieces of
 material which forms the drip flap 420. The first and second pieces are
 illustratively sewn together to hold the rigid member 520 in place. The
 relatively rigid member 520 prevents the drip flap from rotating upwardly
 into the space between the seat portion 412 and the center leg support
 portion 440 of the mattress 18' when the removable center leg support
 portion of the mattress is moved from the storage compartment 94 below the
 deck to the use position within the mattress central opening 418. It will
 be noted that the relatively rigid member 520, the drip flap 420 and the
 portion of the central opening 418 adjacent the drip flap all follow the
 same contour as viewed from above. As shown in FIG. 26, the rigid member
 520' illustratively includes two outer segments 521 and a center segment
 523 that correspond to the two outer segments 421 and the center segment
 423 of the drip flap 420. The rigid member 520 is illustratively formed
 from a plastic material, but it may very well be made from any other
 suitable relatively rigid material, such as metal. Also, although the
 first and second pieces are illustratively shown in FIG. 24 as being sewn
 together to hold the rigid member 520 in place, it is within the scope of
 the present invention as presently perceived for the first and second
 pieces to be attached together by any other suitable method--such as
 gluing, using Velcro (trademark), RF welding, etc. It is also understood
 that the rigid member 520 may also be coupled directly to a single piece
 of material forming a drip flap using suitable fasteners--such as gluing,
 using Velcro (trademark), RF welding, etc.
 In a further embodiment shown in FIG. 25, the drip flap 420 includes two
 outer segments 419 in addition to the two bevel segments 421 and the inner
 segment 423. Likewise, as shown in FIG. 25, the relatively rigid piece 520
 attached to the drip flap 420 also includes two outer segments 519 in
 addition to the two bevel segments 521 and the inner segment 523. In the
 configuration of the drip flap 420 shown in FIG. 25, the outer segments
 419 extend downwardly farther than the bevel and inner segments thereof
 421, 423.
 As previously indicated, the drip flap 420 reduces the exposure of the deck
 16 and the frame 14 adjacent the central opening 418 to fluids when the
 center leg support section 17 of the deck is stowed in the storage
 compartment 94 below the deck. The drip flap 420 in conjunction with the
 catch basin 62 facilitates containment of the fluids often encountered
 during procedures such as childbirth. The relatively rigid element 520
 secured to the drip flap 420, on the other hand, prevents the drip flap
 from folding upwardly when the removable center leg support section 17 of
 the deck 16 is moved from the storage compartment 94 below the deck to the
 use position within the central opening 15.
 It will be understood that many different configurations of the drip flap
 420 and the relatively rigid member 520 are possible. FIGS. 28-31
 illustrate some additional configurations. It will be noted that these
 configurations correspond to the contour of the mattress central opening
 418 adjacent the drip flap 420. FIG. 28 shows a two piece configuration of
 the rigid element 520 similar to FIG. 26. FIG. 29 shows an arcuate
 configuration. FIG. 30 shows an angular configuration and FIG. 31 shows a
 rectangular configuration.
 Although the invention has been described in detail with reference to
 certain illustrated embodiments, variations and modifications exist within
 the scope and spirit of the present invention as described and defined in
 the following claims.