Hospital bed

[0002] This application is a continuation of U.S. patent application Ser. No., 09/655,525, filed Sep. 15, 2000, now U.S. Pat. No. 6,374,346, which is a continuation of U.S. patent application Ser. No. 09/370,272, filed Aug. 9, 1999, now U.S. Pat. No. 6,112,345, which is a divisional of U.S. patent application Ser. No. 09/009,522, filed Jan. 20, 1998, now U.S. Pat. No. 5,933,888, which is a divisional of U.S. patent application Ser. No. 08/755,480, filed Nov. 22, 1996, now U.S. Pat. No. 5,708,997, which is a divisional of U.S. patent application Ser. No. 08/277,243, filed Jul. 19, 1994, now U.S. Pat. No. 5,577,279, which is a continuation in part of U.S. patent application Ser. No. 08/234,403, filed Apr. 28, 1994, now U.S. Pat. No. 5,454,126, which is a continuation in part of U.S. patent application Ser. No. 08/186,657, filed Jan. 25, 1994, now U.S. Pat. No. 5,479,666, and a continuation in part of U.S. patent application Ser. No. 08/230,061, filed Apr. 21, 1994, now U.S. Pat. No. 5,513,406, a continuation in part of U.S. patent application Ser. No. 08/221,748, filed Mar. 31, 1994, now U.S. Pat. No. 5,672,849, and a continuation part of U.S. patent application Ser. No. 08/221,633, filed Apr. 1, 1994, now U.S. Pat. No. 5,483,709, all of which are hereby incorporated by reference herein as if fully set forth in their entirety. The disclosures of U.S. Pat. Nos. 5,337,845; 5,335,651; 5,370,111; and 5,117,521 are hereby incorporated by reference herein as if fully set forth in their entirety.

[0003] This invention relates generally to hospital beds, and more particularly to hospital beds which convert from a bed configuration to a chair configuration.

[0004] During a patient's stay in a hospital, the patient is normally confined to his or her hospital bed for some period of time, at least initially. During this portion of the patient's hospital stay, all of the care functions provided by attending physicians, nurses and the like are provided to the patient as he or she resides on the hospital bed.

[0005] According to the present invention, a patient support is provided. The patient support includes a base, a support platform supported by the base, and a walker. The support platform includes a seat panel and a leg panel movable relative to the seat panel to a chair position. The walker is dockable to the frame. A space is defined between the walker and the leg panel when the walker is coupled to the frame. The space has sufficient size to permit a patient to stand between the walker and the leg panel.

[0006] According to another aspect of the present invention, a patient support is provided. The patient support includes a frame and a walker. The frame includes a base and a patient support platform. The patient support platform includes at least a seat section and a leg section. The leg section is movable relative to the seat section from a bed position substantially parallel with the seat section and a chair position rotated downward relative to the seat section. The walker is dockable with the frame.

[0007] According to another aspect of the present invention, a patient support is provided. The patient support includes a frame and a walker. The frame includes a base and a patient support platform. The patient support platform includes a plurality of sections. A first section of the plurality of sections is movable relative to the base to position a patient's legs for contact with a portion of a floor surface. The walker is dockable with the frame.

[0008] According to another aspect of the present invention, a patient support is provided. The patient support includes a frame and a walker. The frame includes a base and a patient support platform. The patient support platform includes a head section, a seat section, and a leg section. The patient support platform is configured to move between a bed position and a chair position with the leg section moved relative to the seat section and the seat section in a substantially horizontal position. The walker is dockable with the frame to permit a patient seated on the seat section to use the walker when the patient support platform is in the chair position.

[0009] According to another aspect of the present invention, a patient support is provided. The patient support includes a frame and a walker. The frame includes a base and a patient support platform. The patient support platform includes a head section, a seat section, and a leg section. The patient support platform is configured to move between a bed position and a chair position with the head section moved relative to the seat section and the seat section in a substantially horizontal position. The walker is dockable with the frame.

[0010] According to another aspect of the invention, a patient support is provided. The patient support includes a patient support frame and a walker. The patient support frame includes a base and a patient support supported by the base. The patient support frame includes a head end and a foot end. The walker is dockable with the foot end of the patient support frame. The walker includes a frame and a seat pivotable between a use position configured to securely support a patient seated thereon and a storage position to increase an uncovered portion of a floor surface for walking.

[0011] According to another aspect of the present invention, a patient support is provided. The patient support includes a patient support frame and a walker. The patient support frame includes a base and a patient support supported by the base. The patient support includes a head end and a foot end. The walker is dockable to the foot end of the patient support frame. The walker includes a frame and a seat pivotably coupled to the frame of the walker.

[0012] According to another aspect of the present invention, a patient support is provided. The patient support includes a frame, a mattress, and a rail. The mattress is supported by the frame. The mattress includes head and foot ends and first and second sides extending between the head and foot ends. The rail is movable from a foot rail position blocking egress of a patient from the foot end of the mattress and a side rail position. The rail is configured to move toward the head end of the mattress when moved from the foot rail position to the siderail position.

[0013] According to another aspect of the present invention, a patient support is provided. The patient support includes a frame, a mattress, and a rail. The frame includes a base and a patient support platform positionable in a substantially flat bed position. The mattress is supported by the patient support platform and defines a footprint projected downward on a floor surface when the patient support platform is in the bed position. The footprint includes a head end, a foot end, and first and second sides extending between the head and foot ends. The rail is movable from a foot rail position to block egress of a patient from the foot end of the footprint and a side rail position to block egress of a patient from the first side of the footprint.

[0014] According to another aspect of the present invention, a patient support is provided. The patient support includes a frame, a mattress, and a pair of rails. The frame includes a base and a patient support platform movable between first and second positions relative to the base. The mattress is supported by the patient support platform. The mattress includes a head end and a foot end. The mattress defines a footprint when projected downward on a floor surface when the patient support platform is in the first position. Movement of the patient support platform to the second position uncovers a portion of the footprint to permit the patient to stand thereon. The pair of rails are movable from foot rail positions to block egress of a patient from the foot end of the mattress and side rail positions. The portion of the footprint is positioned between the rails when the rails are in the side rail positions.

[0015] According to another aspect of the invention, a patient support is provided. The patient support includes a frame, a mattress, and a rail. The frame includes a base and a patient support platform including at least a seat section and a leg section. The leg section is movable between a bed position in a substantially parallel relationship with the seat section and a chair position rotated downward relative to the seat section. The mattress is supported by the patient support platform. The mattress has a head end and a foot end. The rail is movable from a foot rail position to block egress of a patient from the foot end of the mattress and a siderail position.

[0016] According to another aspect of the invention, a patient support is provided. The patient support includes a frame, a mattress, and a rail. The frame includes a base, a patient support platform configured to shift longitudinally relative to the base, and a longitudinally extending rail support member. The mattress is supported by the patient support platform. The mattress includes a head end, a foot end and a leg support section positioned between the head and foot ends. The mattress defines a footprint when projected downward on a floor surface when in a substantially flat bed position. The rail support member is positioned adjacent to the leg support section when the mattress is in the substantially flat bed position. The leg support section of the mattress is movable to a position uncovering a portion of the footprint to permit the patient to stand thereon. The rail is supported by the rail support member of the frame. The rail is positioned to permit a patient to hold thereon when standing on the portion of the footprint.

[0017] According to another aspect of the present invention, a patient support is provided. The patient support includes a frame, a mattress, and a patient care module. The frame includes a base and patient support platform. The patient support platform is movable relative to the base between first and second positions. The mattress is supported by the patient support platform. The patient care module is positioned under the patient support platform when the patient support platform is in the first position. Movement of the patient support platform to the second position uncovers the patient care module to permit a patient supported on the mattress to access the patient care module.

[0018] According to another aspect of the present invention, a patient support is provided. The patient support includes a frame and a mattress. The frame includes a base and a patient support platform supported by the base. The base includes a head end and a foot end. The patient support platform includes at least a seat section and a leg section. The leg section of the patient support platform is movable between a bed position in substantially parallel relationship with the seat section and a chair position with the leg section rotated downward relative to the seat section. The mattress is supported by the patient support platform. The patient support platform is movable in a first longitudinal direction toward the head end of the base from a first position to a second position. The leg section of the deck is movable to the chair position when the patient support platform is in the second position.

[0019] According to another aspect of the present invention, a patient support is provided. The patient support includes a frame and a mattress. The frame includes a base and a patient support platform supported by the base. The base includes a head end and a foot end. The patient support platform includes at least a head section, a seat section, and a leg section. The head and leg sections of the patient support platform are movable between bed positions in substantially parallel relationship with the seat section and chair positions with the head section rotated upward relative to the seat sections and the leg section rotated downward relative to the seat section. The mattress is supported by the patient support platform. The patient support platform is movable in a first longitudinal direction toward the head end of the base from a first position to a second position. The head section of the deck is in the chair position when the patient support platform is in the second position.

[0020] According to another aspect of the present invention, a patient support is provided. The patient support includes a frame and a mattress. The frame includes a base and a patient support platform. The patient support platform is longitudinally movable relative to the base. The patient support platform includes at least a head section, a seat section, and a leg section. The head and leg sections of the patient support platform are movable between bed positions in substantially parallel relationships with the seat section and chair positions with the leg section rotated relative to the seat section and the head section rotated relative to the seat section. Movement of the leg section to the chair position is independent of movement of the head section to the chair position. The mattress is supported by the patient support platform and defines a footprint projected downward on a floor surface when the patient support platform is in the bed position. Movement of the leg section of the patient support platform uncovers a portion of the footprint. The frame is configured to permit access to the portion of the footprint from outside of the frame to permit entry and egress to and from the portion of the footprint by a patient.

[0021] According to another aspect of the present invention, a patient support is provided. The patient support includes a frame and a mattress. The frame includes a base and a patient support platform supported by the base. The patient support platform is longitudinally movable relative to the base. The patient support platform includes at least a head section, a seat section, and a leg section. The head and leg sections of the patient support platform are movable between bed positions in substantially parallel relationships with the seat section and chair positions with the leg section rotated downward relative to the seat section and the head section rotated upward relative to the seat section. Movement of the leg section to the chair position is independent of movement of the head section to the chair position. The mattress is supported by the patient support platform. The mattress defines a footprint projected downward on a floor surface when the patient support platform is in the bed position. Movement of the leg section of the patient support platform uncovers a portion of the footprint to permit a patient to stand thereon.

[0022] According to another aspect of the present invention, a patient support is provided. The patient support includes a frame and a mattress. The frame includes a base, an intermediate frame, a patient support platform supported by the intermediate frame, and a mechanism configured to raise and lower the intermediate frame relative to the base. The patient support platform is movable in a longitudinal direction relative to the base. The patient support platform includes at least a seat section and a leg section. The leg section of the patient support platform is movable between a bed position in substantially parallel relationship with the seat section and a chair position with the leg section rotated downward relative to the seat section. The mattress is supported by the patient support platform. The mattress defines a footprint projected downward on a floor surface when the patient support platform is in the bed position. Movement of the leg section of the patient support platform uncovers a portion of the footprint that remains located between perimeter portions of the frame after said movement. The frame is configured to permit access to the portion of the footprint from outside of the frame to permit entry and egress to and from the portion of the footprint.

[0023] Features of the present invention will become more readily apparent during the following detailed description taken in conjunction with the drawings herein, in which:

[0024] FIG. 1 is a side elevational view of the hospital bed of the present invention;

[0025] FIG. 1A is a view similar to FIG. 1 but with the patient support platform shown in a lowermost position and with the head panel pivoted upwardly and the leg panel pivoted downwardly;

[0026] FIG. 2 is a view taken along line 2—2 of FIG. 1;

[0027] FIG. 3 is the encircled area of FIG. 1 shown enlarged;

[0028] FIG. 4 is a view taken along line 4—4 of FIG. 3;

[0029] FIG. 5 is a view similar to FIG. 2 but just of the seat, thigh and leg panels;

[0030] FIG. 6 is a view taken along line 6—6 of FIG. 5;

[0031] FIGS. 7A-F are views taken along line 7A—7A of FIG. 5 during downward pivoting of the leg panel;

[0032] FIGS. 8A-F are views taken along line 8A—8A of FIG. 5 also during downward pivoting of the leg panel;

[0033] FIGS. 9A-B are views taken along line 9A—9A of FIG. 5 during initial retraction of the patient support platform;

[0034] FIG. 10 is a view similar to FIG. 1A but with the thigh and leg panels pivoted upwardly;

[0035] FIG. 11 is a perspective view of a bolster and associated orthopedic frame and foot gate sockets;

[0036] FIG. 12 is a perspective of the hospital bed of the present invention shown in conjunction with a wheelchair;

[0037] FIG. 13 is a perspective view of the hospital bed of the present invention shown in conjunction with a toilet module and a patient safety harness;

[0038] FIG. 14 is a perspective view of the hospital bed of the present invention shown in conjunction with a mobile power column;

[0039] FIG. 15 is a perspective view of an alternative form of bolster;

[0040] FIGS. 15A-B are perspective views of a hospital bed incorporating the bolsters of FIG. 15;

[0041] FIG. 16 is a perspective view of the foot end of the main frame with preferred embodiments of the toilet module, toilet module latches and foot gates;

[0042] FIG. 17 is a view taken along line 17—17 of FIG. 16;

[0043] FIG. 18 is a view taken along line 18—18 of FIG. 16;

[0044] FIGS. 19A-E are sequence side elevation views of the bed of the present invention; and

[0045] FIGS. 20A-20E illustrate the bed configured as an ambulatory/rehabilitation bed.

[0046] With reference first to FIG. 1, there is illustrated a hospital bed 10 according to the present invention. The bed 10 comprises, generally, a base 12, a main frame 14 mounted above the base 12, and a patient support platform 16 movably mounted on the main frame 14.

[0047] Referring now to FIGS. 1-6, it will be seen that the base 12 of hospital bed 10 includes a pair of frame members 20, 20 each of which includes a first longitudinally oriented section 22, a first laterally outwardly diverging section 24, a second longitudinally oriented section 26 and a second laterally outwardly diverging section 28. Base 12 of hospital bed 10 is of extended length and defines a “Y” shape, the opening of which is toward the foot end of the bed 10. The advantages of the extended length and foot facing Y will be subsequently described.

[0048] At the head end of the base 12 there is a transverse member 30 connected to the head ends of the longitudinally oriented sections 22, 22 of the base frame members 20, 20. On the laterally outward ends of the transverse member 30 are head end casters 32. Mounted on the foot ends of sections 28, 28 of the frame members 20, 20 of the base 12 are foot end casters 34.

[0049] The main frame 14 includes a pair of longitudinally oriented rails or frame members 40 which span the length of the bed 10. Connected to the head end of each of the rails 40 is a transverse cross member 42 from which extends upwardly a headboard 44. A pair of braces 46, 46 connect the head ends of the rails 40 to the head end cross member 42. At the foot end of the main frame 14 each of the rails 40 include a laterally outwardly diverging section 48. Pivotally attached to the ends of each of the sections 48 is a pivoting footboard half 50. Pivoting footboard halves or foot gates 50, 50, when oriented transversely to the length of the bed 10, function together as a footboard. When the pivoting footboard halves 50, 50 are pivoted toward the head end of the bed 10 to a position generally parallel the length of the bed 10, the footboard halves 50, 50 function separately as sideguards/handrails for aiding a patient in egressing from the bed 10 when the bed 10 is configured as a chair. The main frame 14 is of extended or full length and has advantages which likewise will be described.

[0050] A pair of parallelogram linkages 60, 60 movably mount the main frame 14 to and above the base 12. Each parallelogram linkage 60 includes upper and lower links 62, 64 having lower ends pivotally connected to a bracket 66 mounted to member 30 of base 12 at pivots 68, 70 respectively. The links 62, 64 are pivoted at their upper ends to a bracket 72 mounted to each main frame rail 40 at pivots 74, 76. Brackets 72 are pivoted to the rails 40 at pivots 78. Main frame 14 pivots at the pivots 78, 78 relative to the linkage 60 and hence base 12 thus providing Trendelenburg and reverse Trendelenburg movement of the main frame 14 and hence the patient support platform 16. A pair of gas springs 80, 80 are located beneath rail 40 of main frame 14 and have cylinder ends connected to the lower end of each bracket 72 and piston rod ends connected to each rail 40. The two pairs of gas springs 80, 80 provide rotational resistance to the main frame 14 when positioned in the Trendelenburg and reverse Trendelenburg positions and any position in between. Gas springs 80 may be actuated by any conventional means.

[0051] A hydraulic piston and cylinder 82 has a cylinder end pivotally connected between the sections 22 of the base frame members 20 at pivot 84 and a piston rod end pivotally connected between the upper links 62 of each parallelogram linkage 60 at a pivot connection 86. Pivot 86 is located between a pair of triangular plates 87, 87 both of which are mounted to a pair of cross braces 88, 88 spanning between and connected to upper links 62, 62 of the parallelogram linkages 60, 60. Extension and retraction of the piston and cylinder 82 moves main frame 14 upwardly and downwardly relative to the base 12.

[0052] The patient support platform 16 includes a head panel 90, a seat panel 92, a thigh panel 94 and a leg panel 96. Head panel 90 and seat panel 92 are hinged at pivot points 98, 98. Seat panel 92 and thigh panel 94 are hinged at pivot points 100, 100.

[0053] Leg panel 96 comprises a calf panel 102, a panel 104 and a pair of lateral side bolsters 106, 106. Lateral side bolsters 106, 106 are pivoted to thigh panel 94 at outboard pivots 108 and inboard pivots 110. Inboard pivots 110 also serve to pivot calf panel 102 to thigh panel 94. Foot panel 104 is pivoted to the calf panel 102 via pivots 112.

[0054] Seat panel 102 is mounted upon a carriage 120 which includes a pair of rollers 122, 122 on either lateral side thereof. Each pair of rollers 122, 122 rolls within an inwardly facing channel 124 secured to an inboard side of each rail 40 of the main frame 14 (FIG. 6).

[0055] A piston and cylinder 126 has a cylinder end 126apivotally connected to the forward end of main frame 14 at pivot 128 and a piston rod end 126bpivotally connected between a pair of links 130, 130 at 132. Each of the links 130, 130 is pivotally connected at a pivot 134 to a torque plate 136 which itself is fixedly secured to the head panel 90. Extension and retraction of the piston and cylinder 126 thus serves to extend toward the foot end and retract away from the foot end the patient support platform 16 along the main frame 14, as well as to pivot downwardly and upwardly the head panel 90. Head panel 90 is additionally connected to the main frame 14 via a pair of links 138, 138 each of which has a head end 138apivotally connected to the main frame 14 at a pivot 140 and a foot end 138bpivotally connected to the head panel 90 at a pivot 142. A bracket 144 depends from the seat panel 92 and carries an upper roller 146 and a lower roller 148. The piston rod 150 of the piston and cylinder 126 resides between the rollers 146, 148, the rollers providing support against upward and downward deflections of the rod 150. The full stroke of the piston and cylinder 126 is 18 inches. Thus, when the patient support platform 16 is in the normally horizontal and extended (retracted) attitude, rod 150 and hence pivot 132 are fully extended. Retraction of the pivot 132 18 inches toward the head end of the bed 10 via the piston and cylinder 126 results in 12 inches of travel of the patient support platform 16 on the main frame 14 toward the head end of the bed 10, with 6 inches of motion being lost between pivots 132 and 134. Six inches of relative travel between the pivots 132 and 134 results in the head panel 90 being pivoted to the full up position via the torque plates 136, 136 (FIG. 1A); likewise, 12 inches of travel of the pivot 134 and hence pivot 98 results in the links 138, 138 driving the head panel 90 to the full up position (also FIG. 1A). The combination of torque plates 136, 136 in conjunction with links 138, 138 provides for efficient upward pivoting of the head panel 90, as torque plates 136, 136 are most effective during initial upward pivoting of head panel 90 whereas links 138, 138 are most efficient during final upward pivoting of the head panel 90.

[0056] Referring now to FIGS. 5 and 8A-F, a second carriage 160 is provided for actuation of the leg panel 96. Carriage 160 comprises a transverse member 162 and a longitudinal plate member 164 mounted on each lateral end 162a, 162bof the transverse member 162. One roller 166 of a pair of rollers 166, 166 is mounted on each end 164a, 164bof each of the longitudinal members 164, 164. Each of the two roller pairs 166, 166 rolls within one of the channels 124, 124 secured to each of the rail members 40, 40 of the main frame 14. A piston and cylinder 168 has a cylinder end 168apivotally connected to a bracket 170 at 172, which bracket 170 is secured to the underneath side of the seat panel 92. The piston rod end 168bof the cylinder 168 is pivotally secured to the cross member 162 at 174. A plate 176 is fixedly secured to the cross member 162 inboard of each plate 164. Each plate 176 carries a roller 178. Each roller 178 rides along and in contact with a roller bearing surface or plate 180, which itself is a part of a vertically oriented downwardly extending plate 182 connected to each lateral edge 102a, 102bof the calf panel 102. The plate 182 further includes an upwardly angled ramp 184 commencing at a head end edge 186 of the roller bearing plate 180. Ramp 184 is actually one side of a channel 188 including an opposite side 190. Calf panel 102 is supported on rollers 178, 178 by virtue of the fact that each roller tearing plate 180 bears down upon and against one of the rollers 178. Each roller 178 is operable to roll along its respective roller bearing plate 180 as the piston and cylinder 168 extends and retracts. As each roller 178 rolls past each edge 186 of each plate 180 the calf panel 102 is permitted to pivot downwardly relative to the main frame 14, the operation of which will be described subsequently.

[0057] Referring now to FIGS. 5 and 7A-F, a first link 200 has a first end 200apivoted to the foot panel 104 at pivot 202. A second link 204 has a first end 204cpivoted to the second end 200bof link 200 at 206, and a protuberance 208 on a second end 204b. Link 204 is pivoted to a bracket 205 mounted on the calf panel 102 at pivot 210. A plate 212 is fixedly secured to cross member 162 of the carriage 160. Pivotally mounted on the plate 212 is a roller 214. Roller 214 normally contacts the lower edge 204cof link 204 near the pivot 206 when the patient support platform 16 is in a generally horizontal attitude. Retraction of the piston and cylinder 168 causes the roller 212 to travel along the lower edge 204cof link 204 toward the protuberance 208. Further travel of the roller 214 causes the foot panel 104 to pivot downwardly relative to the calf panel 102, the operation of which will be described subsequently. A gas spring 216 has a piston rod end 216apivotally mounted to the foot panel 104 at 218 and a cylinder end 216bpivotally mounted to the link 204 at the pivot 206. Gas spring 216 is normally under compression; that is to say, gas spring 216 has a tendency to extend itself.

[0058] Describing now the operation of the leg panel 96, and referring now specifically to FIGS. 7A-F, the patient support platform 16 begins in the normally horizontal, planar attitude. Initial retraction of the piston and cylinder 168 causes the roller 214 to ride along the underneath side 204cof the link 204. Continued retraction of the piston and cylinder 168 causes the roller 214 to contact the protuberance 208 on link 204. Further retraction of the piston cylinder 168 causes the link 204 to begin rotating counterclockwise about pivot 210 due to the action of roller 214 on protuberance 208, and the action of the gas spring 216 upon link 204. Counterclockwise rotation of link 204 exerts a downward force on foot panel 104 via the connection therebetween by link 200.

[0059] Referring now to FIGS. 8A-F, which correspond in time sequence to FIGS. 7A-F, as the piston and cylinder 168 retracts, the carriage 160 travels toward the head end of the bed 10. Rollers 178, 178 which support the calf panel 102 as the roller bearing plates 180, 180 bear thereupon, travel toward the head end edges 186, 186 of the roller bearing plates 180, 180. As each roller 178 rolls past each edge 186, gravity allows the calf panel 102 to begin dropping downwardly by pivoting at pivot 110 as the channels 188, 188 collapse downwardly onto the rollers 178, 178, the rollers 178, 178 rolling upwardly relative to the ramps 184, 184 each of which is one side of the channels 188, 188.

[0060] Thus, complete retraction of the cylinder 168 results in the condition shown in FIGS. 1A, 7F and 8F wherein the foot panel 104 has been pivoted relative to the calf panel 102 by slightly more than 90.degree, and wherein the calf panel 102 has been pivoted relative to the thigh panel 94 by approximately 90.degree. And, full retraction of the piston and cylinder 126 causes the patient support platform 16 to be translated toward the head end of the bed 10 and the head panel 90 to be pivoted to the upwardmost position (FIG. 1A). Thus, in this configuration, the bed 10 is configured as a chair.

[0061] Referring now to FIG. 13, the hospital bed 10 of the present invention is shown with a toilet module 230 used in conjunction therewith. Toilet module 230 includes a toilet portion 232, a seat portion 234 and casters 236. The seat 236 can conveniently slidably engage the sections 48, 48 of the rails 40, 40 of the main frame 12. The toilet 232 may then be rolled underneath the seat 234. Alternatively, the assembled seat 234 and toilet 232 may remain attached to the main frame 40, and carried with the bed 10 as an onboard toilet module. Toilet module 236 conveniently fits within the footprint of the standard 93 inch length hospital bed 10, thus requiring no lengthening of bed 10, and is normally concealed by the leg panel 96. In use of the hospital bed 10 with the toilet module 230, the bed would be in its normally horizontal attitude with the leg section 96 concealing the module 30 and the patient 262 lying supine upon the mattress 238 atop the patient support platform 16. A preferable mattress for use with the hospital bed 10 of the present invention is disclosed in application Ser. No. 08/234,403. Piston and cylinder 126 is then energized to translate the entire patient support platform 16 towards the head end of the bed 10 relative to the main frame 14. Head panel 90 pivots upwardly during this retraction as described above. Once the patient support platform 16 has been fully retracted atop the main frame 14 as detected by appropriate sensors known to those skilled in the art, appropriate control circuitry and the like, likewise known to those skilled in the art, energizes piston and cylinder 168. Since the patient support surface 16 has been fully retracted prior to activation of downward pivoting of the foot and calf panels 104 and 102 respectively, the foot end edge 240 of foot panel 104 has cleared the head end edge 242 of the toilet module 230, the dimension of the toilet module 230 from head end edge 242 to foot end edge 244 being slightly less than the 12 inches of horizontal travel traversed by the patient support 16 on the main frame 14. Pivoting of the foot panel 104 relative to the calf panel 102 and pivoting of the calf panel 102 relative to the thigh panel 94 then proceeds as discussed above in connection with the discussion of FIGS. 7A-F and FIGS. 8A-F, respectively. As described in applications Ser. Nos. 08/234,403 and 08/186,657, the patient support platform 16 is lowerable to a lowermost position to allow a patient's feet to rest directly on the floor. Bed controls, known to those skilled in the art, may be located on the foot gates 50, 50 as illustrated at 400, on the standard sideguards 402 as illustrated at 404, or both to allow for manipulation of the bed 10.

[0062] Once the patient's feet are securely placed on the floor, the patient can employ the vertical lift piston and cylinder 82, activated by patient controls 400 or 404 on the foot gates 50, 50 or sideguards 402, respectively, to power lift the patient to an upright position, as described in applications Ser. Nos. 08/234,403 and 08/186,657. Once in the upright standing position, the patient can turn 180.degree. so as to be seated upon seat 234, which has traveled upwardly with main frame 14 during the above-described vertical lift assist. Since the seat 234 is in a high position, the transition from standing to sitting is eased for the patient. The main frame 14 and toilet module seat 234 can then be lowered to a comfortable sitting position for the patient. Once patient elimination is complete, the vertical lift cylinder 82 can be activated by the patient utilizing the patient controls 400 or 404 to urge the patient to a standing position, at which time the patient can turn back 180.degree. so as to be in a position to again sit in the chair configured bed. The bed can then be lowered to ease the patient back into the sitting position. See FIGS. 19A-D.

[0063] Similarly, the hospital bed 10 of the present invention can be used in conjunction with other patient care modules, such as, for example, the wheelchair module 250 as shown in FIG. 12. Such a wheelchair 250 would include a base 252, wheels 254, a backrest 256, a seat 258 and appropriate controls 260. As with the toilet module 230, the wheelchair module 250 could be docked to the bed 10 as an onboard module which travels with the bed 10. The seat 258 would, as with the toilet module 230, reside under and normally be concealed by the leg section 96 and would travel upwardly and downwardly with main frame 14 to assist a patient in sitting on and rising from the wheelchair 250. As with the toilet module 230, the leg section 96 would retract from over the seat 258 at which time downward pivoting of the foot and calf portions 104 and 102 respectively would occur thus providing access to the wheelchair module 252 by a patient 262.

[0064] An alternative form of mounting for the pivoting footboard halves or foot gates 50, 50 and which allows for those footboard halves 50, 50 to be repositioned such that any weight applied thereon by a patient, such as shown in FIGS. 12 and 13, would be applied between or intermediate of the head end casters 32 and foot end casters 34 of the bed 10 is shown in FIG. 11. In FIG. 11, an extension 270 is secured to each bolster 106. Each extension 270 would include a foot gate socket 272 and a fracture frame socket 274 (the use of which will be described subsequently). Thus, rather than being pivotally mounted to the ends of the sections 48, 48 of the rails 40, 40 of the main frame 14, the pivoting footboard halves 50, 50 would be pivotally mounted within the foot gate sockets 272, 272 as by a shaft (not shown) depending from the bottom of each footboard half or foot gate 50. Thus, as the patient support platform 16 retracts atop the main frame 14 by virtue of the action of the piston and cylinder 126, the footboard halves 50, 50 travel with the patient support platform 16 such that they are repositioned to a position intermediate the head end casters 32 and foot end casters 34. Thus, when swung from their positions generally transverse to the bed 10 at which they function together as a footboard, to their positions generally parallel the longitudinal dimension of the bed 10, the footboard halves 50, 50 may function as sideguards/handrails as shown in FIGS. 12 and 13 thus aiding a patient 262 in moving from the chair configured bed 10 to a patient care module such as the toilet module 230 or wheelchair module 250. The downward force applied by the patient 262 to the sideguards/handrails 50, 50 is thus directed within the footprint of the casters, thus providing for optimum bed stability when egressing the bed and alighting upon one of the patient care modules.

[0065] As shown in FIG. 13, a frame 280 is provided for use with the hospital bed 10. The frame 280 includes a vertical head end portion 282 which includes appropriate lower ends, one of which is shown at 284, for insertion into sockets 286 in the head ends of each of the rails 40, 40 of the main frame 14. The frame 280 further includes vertical foot end portions 288, 288 having appropriate lower ends 290, 290 for insertion into the fracture frame sockets 274, 274. To accommodate the changes in relative distance between the foot end vertical members 288 and the head end vertical member 282 a pair of telescoping horizontal members 292 and 294 are provided such that the frame 280 can extend and retract as the patient support platform 16 extends and retracts. The frame 280 can be used as a fracture or orthopedic frame. In that case, the frame and traction apparatus associated therewith remain in the same relative position to a patient 262 supported on the bed 10 during extension and retraction of the patient support platform 16.

[0066] In addition, the frame 280 can include a safety harness 300 which is operable to travel the length of the frame 280. Harness 300 includes a traveling collar 302 slidably mounted on frame member 294. Vertical tethers 304, 304 connect the collar 302 go to a vest 306 worn by the patient 262. The traveling harness 300 helps to provide security and stability to the patient 262 as the patient egresses from the bed 10 configured as a chair and moves from a sitting position to a standing position and onto a patient care module positioned at the foot end of the bed 10.

[0067] Referring now to FIGS. 5, 9A-B and 10, a pin 310 is fixedly secured to each lateral rail 312 of the foot section 104. Pin 310 normally resides in a slot 314 in the underneath side of inboard lateral rail 316 of the bolster 106. A link 318 has a first end 318apivoted to plate 164 of carriage 160 at 320. The second end 318bof the link 318 includes an upturned finger portion 322 thereon. A block 324 is pivoted to link 318 at pivot 326. Block 324 includes a notch 328 in an upper forward corner thereof including a horizontal surface 328aand a vertical surface 328b.

[0068] A piston and cylinder 330 includes a cylinder end 330apivotally connected to an L-shaped bracket 332 connected to seat panel 92 at pivot 334. A piston rod end 330bis pivotally connected to the thigh panel 94 at a pivot 336. Piston and cylinder 330 is operable to pivot thigh panel 94 and the entire leg panel 96 upwardly to provide for elevation of a patient's feet and legs.

[0069] For piston and cylinder 330 to raise the entire leg section 96 upwardly to the position shown in FIG. 10, piston and cylinder 330 is energized prior to any retraction of the patient support platform 16. As pivots 108, 110 move upwardly due to the action of the piston and cylinder 330, pin 310 acting upon vertical surface 328bof block 324 causes block 324 and hence the link 318 to pivot upwardly about pivot 320. Thus, the foot panel 104 and the bolsters 106 which are connected thereto via the pins 108, 310 remain in a generally horizontal attitude as the thigh panel 94 is pivoted upwardly. As can be seen in FIG. 10, when the leg panel 96 is in the raised position, the hook portion 322 of the link 318 hooks over the pin 310. Thus, the leg panel 96 comprising the calf panel 102, foot panel 104 and side bolsters 106, 106 remains locked against any inadvertent further upward lifting which could tend to disengage the leg panel 96 from the links 318, 318 and blocks 324, 324.

[0070] As is best seen and understood in FIGS. 7A-B and 9A-B, during initial retraction of carriage 160 via piston and cylinder 168, the horizontal surface 328aof the block 324 is moved from under the pin 310, and the hook portion 322 of link 318 is moved to the head end side of the pin 310. Since pin 310 is thus free to drop out of the groove 314, foot panel 104 is thus freed to pivot downwardly relative to the side bolsters 106, 106.

[0071] Referring now to FIG. 15, there is shown an alternative form of the bolster 106. In this form, bolster 106 includes an additional or upper bolster frame member 340 pivotally connected to the standard lower bolster 106 via a parallelogram linkage 342. Parallelogram linkage 342 includes a first pair of links 344, 344 each of which is pivotally connected on a first end 344ato a pivot 346, and each of which includes a second end 344bpivoted to the frame member 340 at pivot 348. A second pair of links 350, 350 each has a first end 350apivoted to bolster 106 at pivots 108, 110 and a second end 350bpivoted to the frame member 340 at pivot 354. One of the links 350 includes a stop 356 and associated latch mechanism (not shown) which is brought into contact with the lower surface of the frame 340 thus limiting further pivoting movement of the frame member 340 and securing it in the elevated rearward position.

[0072] FIGS. 15A and 15B show the alternative form of the bolsters 106, 106 including pivoting bolster/arm rest portions 340. In these Figures, the frame members 340 are covered with suitable padding and fabric 358. When each of the frame members 340 is in a position juxtaposed to the bolsters 106, the combination bolster 106 with upholstered frame member 340 serves as a side-to-side protective restraint for a patient similar to the prior bolster embodiment. When the bed 10 is configured in a chair position, as shown in FIGS. 15A and 15B, the upholstered frame members 340 may be pivoted from a low forward position to a high rearward position; that is the upholstered frame members 340 are movable from a position forward of and in a plane defined by the seat panel 92 to a position above and along each lateral edge of the seat panel 92 when the leg panel 96 is pivoted downwardly and the head panel 90 is pivoted upwardly, thus providing convenient armrests for a patient situated atop the bed 10 configured as a chair.

[0073] Referring now to FIG. 14, the bed 10 is shown in conjunction with a mobile power column 370. Mobile power column 370 includes a base 372, casters 374 mounted to the base 372, and an upright support 376 connected to the base 372. The upright support 376 may support infusion pumps 378 and infusion solution bags 380, a monitor 382, a keyboard 384, air and/or oxygen tanks 386 and a ventilator 388. A housing 390 mounted to base 372 may house batteries (not shown) and the like, as well as a motorized drive (not shown) for powering the mobile power column 370. With a patient 262 situated atop the bed 10, and with the leg panel 96 folded downwardly, a convenient cavity 392 is formed in the foot end of the bed 10 which may be taken advantage of for docking the mobile power column 370 to the bed 10 for mobile transport of the patient 362 and critical care apparatus with the entire combination taking up no more space than the bed 10 alone.

[0074] Referring now to FIGS. 16-18, and with like numbers referring to like elements, preferred embodiments of the toilet module 230 and foot gates 50, 50 are illustrated. Toilet module 230 comprises a framework 450 including a lower trapezoidal frame 452, an upper trapezoidal frame 454 and upwardly extending rear vertical posts 456, 456 and upwardly extending forward vertical posts 458, 458. A pair of longitudinal struts 460, 460 span the upper rectangular frame 454 and support a toilet seat 462 from which depends a toilet chamber 464. A laterally extending bar 466 extends laterally outwardly from the upper end of each forward post 458, the use for which will be subsequently described.

[0075] A latch block 470 is secured to the lower end of each of the rails 40. Each latch block 470 takes the form of a tube and includes a notch 472 therein for accepting a respective vertical support 456. A plunger 474 is spring loaded towards a closed position via a compression spring 476 within the latch block 470. The plunger 470 includes a chamfer 478 and a semicircular groove 480 therein. Chamfer 478 aids in compressing the latch block 474 and hence compression spring 476 by support 456. Once the vertical pole 456 reaches the semicircular notch 480 the plunger 474 snaps securely against the pole 456.

[0076] An ear of a pair of ears 482, 482 is secured to the lowermost side of each of the rails 40, 40 of the main frame 14. When the toilet module 230 engages the main frame 14, the laterally extending bars 466 are supported by the ears 482. Once the module 230 is docked to the main frame 14, module 230 may travel upwardly and downwardly with the main frame 14 as it is raised and lowered, the bars 466 being supported by the ears 482, and the rear comers of the upper frame 454 being supported by the latch blocks 470.

[0077] A preferred form of foot gate 50 includes an inner tube 490 welded to the rail 40 at the foot end thereof. An outer tube 492 slidably resides over the inner tube 490. Outer tube 492 includes a washer 494 welded therein, the upper surface of which supports a compression spring 496. A screw 498 has a head 500 which exerts a downward force on a washer 502 and hence spring 496, the lower end 504 of which is threaded into the upper end 506 of the inner tube 490. The lower end of the outer tube 492 includes an exterior collar 508 which includes four equally spaced notches 510 therein. Notches 510 accept a pin 512 pressed into the lower end of the inner tube 490. Thus, outer tube 492 is spring biased downwardly relative to inner tube 490. An upper tube 514 is fixedly secured to the upper end of the outer tube 492. A lower support rail 516 is connected to the tube 514 and the outer tube 492. One of the tubes 514 includes a U-shaped groove 518 therein including notches 520 and 522. A plug 524 includes a pin 526 which engages the groove 518. When the tubes 514 are rotated to a position wherein they are collinear, pin 526 may be moved from notch 520 to notch 522 thus causing the plug 524 to move into engagement with the end of the other tube 514 thereby locking the foot gates together. When unlocked, horizontal force applied to the ends of the tubes 514 cause the notches 510 to ride upwardly and over the pins 512 until the next notch is reached at which time the outer tube 494 snaps downwardly back over the pin 512.

[0078] It will therefore be appreciated that the hospital bed of the present invention provides a number of distinct advantages. The Y-shaped bed base, opening toward the foot end, provides a cavity into which a patient care module may reside, such as toilet module or wheelchair, and which also provides room for a patient to maneuver to sit upon that module. No lengthening of a standard hospital bed is required to accommodate the patient care module. The extended length base allows the foot gates to be repositionable intermediate the head end and foot end castors and to serve as hand rails as the patient sits upon the patient care module. Apparatus is provided for guidingly assisting a patient onto a patient care module. Bolsters include armrests which are pivotable upwardly and toward a head end of the bed for patient comfort and security when sitting in the chair configured bed. The full length main frame allows for patient care modules to be connected to a foot end thereof.

[0079] The ambulatory/rehabilitation group of retrofittable modules includes a number of modules each of which dock to the foot end cavity 392 by virtue of the vacatable portion of the foot end of the bed 10 providing access thereto. Rather than purchasing or renting special therapy beds as is the current practice, the ambulatory/rehabilitation group of retrofittable modules transform the modular bed 10 into special therapy beds. The modules can be placed on the modular bed 10 and used throughout the hospital at any point during the patient's stay. The advantages of the modular bed 10 and modules include reduction in numbers of current specialty rental devices, better control of usage of these devices, improved response time for usage and the efficiencies of a modular bed.

[0080] Such modules include an exerciser module 511 which includes rollers 513 for rolling movement, pedals 515 for exercising the legs of a patient, and movable handles 517 for exercising the upper body of a patient. A combination scooter and walker module 521 is provided which has rollers 523, a seat 525 which pivots upwardly for use as a walker and which pivots downwardly for use as a scooter, and handles 527 for grasping by a patient. A toilet module 530 also includes rollers 532 for rolling movement for use with the bed during the ambulatory/rehabilitation phase of care for the bedridden or long-term type patient thereby obviating the need of a patient to leave the bed to go to a bathroom. A wheelchair module 540 also rollable via rollers 542 is provided for docking with the bed 10 for patient ambulations and may form a part of the bed 10 itself. Lastly, a wireless nurse/patient follower module 550 (FIG. 20E) could be worn by the patient during this ambulatory/rehabilitation phase which would transmit signals via a relay 552 to a nurse station 554 for providing an ambulatory patient with a means for locating a nurse as well as providing staff a means of locating a patient. Further, the bed 10 with vacatable foot portion provides for convenient patient egress from the foot end of the bed 10 when portion is vacated. A preferred form of bed 10 with vacatable foot portion is disclosed in application Ser. No. 08/186,657, filed Jan. 25, 1994, entitled FOOT EGRESS CHAIR BED, assigned to the assignee of the present invention.

[0081] Ambulatory/rehabilitation modules are selected from the ambulatory/rehabilitation module group for removable securement to the bed 10. Various ones of these modules are selectively docked to the bed 10 for various patient ambulation/rehabilitation therapy. For example, the exerciser device module 511 can be docked to the bed 10 for exercising of the patient. The walker/scooter module 521 can be docked to the bed 10 for aiding patient ambulations. The toileting module 530 can be docked to the bed 10 thus eliminating the need for the patient to leave the bed 10 to travel to the bathroom. The wheelchair module 540 can also be docked to the bed 10 and utilized for transporting a patient from place to place.

[0082] Those skilled in the art will readily recognize numerous adaptations and modifications which can be made to the present invention which will result in an improved hospital bed, all of which will fall within the spirit and scope of the present invention as defined in the following claims. Accordingly, the invention is to be limited only by the scope of the following claims and their equivalents.