WO2012006545A2 - Systèmes, dispositifs et procédés de support de personne - Google Patents

Systèmes, dispositifs et procédés de support de personne Download PDF

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Publication number
WO2012006545A2
WO2012006545A2 PCT/US2011/043392 US2011043392W WO2012006545A2 WO 2012006545 A2 WO2012006545 A2 WO 2012006545A2 US 2011043392 W US2011043392 W US 2011043392W WO 2012006545 A2 WO2012006545 A2 WO 2012006545A2
Authority
WO
WIPO (PCT)
Prior art keywords
panel
frame
patient
siderail
rail
Prior art date
Application number
PCT/US2011/043392
Other languages
English (en)
Other versions
WO2012006545A9 (fr
WO2012006545A3 (fr
Inventor
Jonathan D. Turner
Christian H. Reinke
Charles A. Lachenbruch
Jack Barney Sing
Michael M. Frondorf
Richard Henry Heimbrock
Brian T. Wiggins
Original Assignee
Hill-Rom Services, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US12/833,321 external-priority patent/US8516634B2/en
Priority claimed from US12/836,606 external-priority patent/US9222685B2/en
Priority claimed from US12/847,337 external-priority patent/US8620625B2/en
Application filed by Hill-Rom Services, Inc. filed Critical Hill-Rom Services, Inc.
Priority to JP2013518864A priority Critical patent/JP5986077B2/ja
Priority to AU2011274503A priority patent/AU2011274503A1/en
Priority to EP11804417.1A priority patent/EP2590610B1/fr
Priority to EP17164865.2A priority patent/EP3210586B1/fr
Publication of WO2012006545A2 publication Critical patent/WO2012006545A2/fr
Priority to US13/733,980 priority patent/US8646131B2/en
Priority to US13/733,962 priority patent/US8713728B2/en
Publication of WO2012006545A9 publication Critical patent/WO2012006545A9/fr
Publication of WO2012006545A3 publication Critical patent/WO2012006545A3/fr
Priority to US14/176,188 priority patent/US9060619B2/en
Priority to US14/269,492 priority patent/US9333134B2/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
    • A61G7/002—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame
    • A61G7/015—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame divided into different adjustable sections, e.g. for Gatch position
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
    • A61G7/05—Parts, details or accessories of beds
    • A61G7/0503—Holders, support devices for receptacles, e.g. for drainage or urine bags
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G1/00—Stretchers
    • A61G1/04—Parts, details or accessories, e.g. head-, foot-, or like rests specially adapted for stretchers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G13/00—Operating tables; Auxiliary appliances therefor
    • A61G13/10—Parts, details or accessories
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G2203/00—General characteristics of devices
    • A61G2203/70—General characteristics of devices with special adaptations, e.g. for safety or comfort
    • A61G2203/72—General characteristics of devices with special adaptations, e.g. for safety or comfort for collision prevention
    • A61G2203/723—Impact absorbing means, e.g. bumpers or airbags

Definitions

  • articulable supports such as hospital beds
  • a support having a deck framework, a deck panel connected to the framework and a motion converter for coordinating a translational motion of the panel with rotation and/or longitudinal translation of the framework.
  • application 12/618,256 are incorporated herein by reference.
  • the application discloses a mode of operation in which rotation of a bed upper body section is accompanied by longitudinal translation of the upper body section and "parallel translation" of an upper body deck panel.
  • the application defines parallel translation as translation of the deck panel in a direction parallel to the existing angular orientation of the upper body section.
  • the teachings of the earlier application are presented in the context of a bed having three actuators for controlling motions of the upper body section.
  • One of these actuators controls the parallel translation.
  • the other two are operated to rotate the upper body section while concurrently translating it longitudinally, to rotate the upper body section without imparting any longitudinal translation, or to translate the upper body section longitudinally without imparting any rotation.
  • beds produced for commercial sale will include fewer actuators for the upper body section.
  • the application also describes a bed with a simplified kinematic configuration having a single upper body section actuator and a dual rack and pinion. In operation the actuator extends or retracts to translate the upper body section longitudinally while changing its angular orientation. At the same time the dual rack and pinion effects the desired parallel translation of the upper body deck panel in response to the translation and orientation of the upper body section.
  • a bed structure includes a frame, a deck framework moveably connected to the frame, a panel moveably connected to the deck framework, and a motion converter.
  • the motion converter translates the panel relative to the deck framework in response to either or both of a) relative translation between the deck framework and the frame, and b) relative rotation of the deck framework and the frame.
  • the motion converter includes a rack secured to the frame, a primary gear meshing with the rack, a panel drive sprocket rotatably mounted on the deck framework coaxially with the primary gear, an idler sprocket rotatably mounted on the deck framework remote from the panel drive sprocket, a slider connected to the panel, and a chain engaged with the panel drive sprocket and the idler and connected to the slider.
  • FIG. 1 A is a schematic, side elevation view of a bed of the type used in hospitals and other health care facilities.
  • FIG. 2A is a perspective views of a bed structure as described herein with a frame and an upper body deck section, the deck section being shown at a horizontal angular orientation relative to the frame.
  • FIG. 3 A is a view similar to that of FIG. 2A but with the deck section at an angular orientation of about 65 degrees relative to the frame.
  • FIG. 4A is a closer view of a portion of FIG. 3 A showing, among other things, a gear rack, a split gear housing positioned at one end of the gear rack, and the lower extremity of the deck section and also having part of a deck section rail broken away to reveal a chain and a chain housing inside the rail.
  • FIG. 5A is a view of the gear rack seen in FIG. 4A but with a slide rail component of the gear rack broken away, with the gear housing at the other end of the gear rack and with certain elements, such as the deck section and one side of the split gear housing, removed.
  • FIG. 6A is a cross sectional view taken in direction 6—6 of FIG. 2A.
  • FIGS. 7A and 8A are exploded views showing components of the bed structure.
  • FIG. 9A-10A are perspective views with selected components removed or broken away to reveal components such as a sprocket, the drive chain and a slider.
  • FIG. 11A is a cross sectional view taken in direction 11— 11 of FIG. 10A showing the slider of FIGS 9A-10A in relation to a rail portion of the upper body deck section, a chain housing and a deck panel drive lug.
  • FIG. 12A is a perspective view showing a second slider in relation to the rail portion of the upper body deck section and a deck panel drive lug.
  • FIG. 13A is a side elavation view of a lift chain.
  • FIG. 14A is a schematic, side elevation view of a bed structure having a nontranslatable joint between a compression link and an elevatable frame of the bed.
  • FIG. 15AA - 15 AD are views similar to that of FIG. 14A showing the results of various modes of motion in an embodiment in which the joint between the compression link and the elevatable frame is longitudinally translatable.
  • FIGS. 1A-3A show a hospital bed 10 extending longitudinally from a head end 12 to a foot end 14 and laterally from a left side 16 to a right side 18.
  • FIGS. 1A-2A also show a longitudinally extending centerline 22.
  • the bed structure includes a base frame 26 and an elevatable frame 28 connected to the base frame by folding links 30.
  • the bed also includes four deck sections: upper body section 34, seat section 36, thigh section 38 and calf section 40, all connected to the elevatable frame.
  • the upper body deck section 34 includes a framework 50 comprising left and right hollow rails 52, 54 joined to each other by an upper beam 56 and a lower beam 58.
  • First and second rail slots 60, 62 penetrate through and extend part way along the top of each rail.
  • each rail also includes a two sided mounting bracket 64.
  • the framework 50 is moveably connected to elevatable frame 28 so that the framework is longitudinally translatable relative to the elevatable frame and is also rotatable about pivot axis 70.
  • Deck section 34 also includes a deck panel 72 (shown in phantom) moveably connected to the framework 50.
  • panel 72 is translatable relative to the framework in directions PI, P2 parallel to the angular orientation a of the framework. This translation is the parallel translation referred to in the application summarized in the "Background" section of this application.
  • the bed also includes a pair of compression links 74 each having a frame end 76 pivotably connected to the elevatable frame at a frame joint 78 and a deck end 82 pivotably connected to the deck framework at a deck joint 84.
  • frame joint 78 is not translatable relative to the frame, however in an alternate embodiment (FIG. 15 A) joint 78 is longitudinally translatable relative to the frame.
  • the bed also includes a drive system which includes an actuator 90 having a deck end 92 connected to upper body deck framework 50 and a grounded end 94 connected to a suitable mechanical ground, such as elevatable frame 28.
  • the drive system also includes a motion converter, indicated generally by reference numeral 100, for translating panel 72 relative to the deck framework in response to at least one of: a) relative translation between the deck framework and the frame, and b) relative rotation of the deck framework and the frame about axis 70.
  • the illustrated embodiment includes both left and right motion converter units 100L, 100R. The units are mirror images of each other, hence it will suffice to describe only one of the units in more depth.
  • FIGS. 4A-8A show components and construction of one of the motion converter units in more detail.
  • the motion converter includes a gear rack 102 affixed to elevatable frame 28.
  • the gear rack may be considered to be a part of the elevatable frame.
  • the illustrated rack comprises a single piece slide rail 104 screwed to the frame and a rack plate 106 screwed to pedestals 108 at each end of the slide rail.
  • a slot 110 extends along the slide rail between the pedestals.
  • the slide rail has laterally inboard and outboard sides 112, 114 each with a shoulder 116.
  • the rack plate includes openings 120 for receiving a gear tooth. The openings have a profile that conforms to the profile of the gear teeth.
  • the motion converter also includes a primary gear 124 in mesh with the rack plate.
  • the gear has a stub shaft 126 extending laterally away from bed centerline 22.
  • a pair of lugs 128 projects laterally from the shaft.
  • a split gear housing 130 has a rectangularly shaped opening 132 extending through its base 134, a cavity 136 inside the base and a tail 138 projecting from the base. The tail nests snugly in slide rail slot 110, and the opening 132 embraces and fits snugly around rack plate 106.
  • An internal plate 140 resides in the cavity. Screws 142 extend through a bearing plate 144 and a backing plate 146 and into the internal plate 140 to slidingly clamp the housing to the slide rail with the bearing plate abutting rail shoulder 116.
  • the primary gear is rotatably mounted inside gear housing 130 by way of inboard and outboard gear bushings 154, 156 and a laterally extending pivot axle 158.
  • the pivot axle also extends through holes 162 in the rail mounting bracket 64 to connect the primary gear to the deck framework. Bearings 164 nest in the holes 162 and circumscribe pivot axle
  • the motion converter also includes a deck panel rotary drive element such as a panel drive sprocket 170.
  • the sprocket resides inside a chain housing 172 located adjacent to and outboard of the gear housing 130.
  • the sprocket is rotatably mounted on pivot axle 158 by way of outboard gear bushing 156.
  • the sprocket has a stub shaft 174 extending laterally toward bed centerline 22. Notches 176 at the inboard tip of the stub shaft mate with lugs 128 on the primary gear stub shaft to rotatably connect the sprocket to the primary gear.
  • the sprocket and the primary gear are thus coaxial and mutually corotatable.
  • the pitch diameters of the primary gear and the sprocket are 37.0 and 42.6 mm respectively. Accordingly, the primary gear and sprocket exhibit a non-unity drive ratio, specifically a drive ratio of about 1.15.
  • the chain housing 172 extends into the hollow interior of the framework (i.e. into rail 52).
  • the chain housing includes an internal track or ledge 182, a shoulder 184, and an elongated slot 186 that registers with first slot 60 in the framework rail.
  • An idler sprocket 192 is rotatably mounted inside the chain housing at its remote end 194. Because the chain housing is stationary with respect to the deck framework 50, the idler can be considered to be mounted on the framework.
  • a slider 200 includes a slide link 202 translatably supported on housing internal track 182, and a slide block 204 bolted to the slide link.
  • the slide link has a ledge 206 that abuts chain housing shoulder 184 to trap the slide link in the chain housing 172.
  • the slide block includes a head portion 208 that overlies the top of framework rail 50 on either side of first rail slot 60 and a neck portion 210 that projects through the rail slot and extends to the slide link.
  • the slider also includes a drive lug 218 projecting from the slide block. The drive lug is connected to deck panel 72, thereby connecting the slider to the panel.
  • a second slider 212 comprises a second slide block 214 having a head portion 226 and a neck portion 228.
  • the second slider also includes a retainer plate 230.
  • Head portion 226 of slide block 214 overlies the top of framework rail 52 on either side of second rail slot 62.
  • Neck portion 228 projects through rail slot 62 and extends to the retainer plate.
  • the slide block and retainer plate are bolted together so that the lateral sides of the retainer plate reside under the interior of framework rail 52 on either side of second rail slot 62 and so that the slider can slide longitudinally along the length of the slot.
  • a drive lug 218 is connected to deck panel 72, thereby connecting the slider to the panel.
  • a roller chain 220 loops around each sprocket 170, 192 and engages with the sprocket teeth.
  • the ends of the chain are connected to opposite ends of the slide link 202, thereby also connecting the chain to the deck panel 72.
  • the chain is a linear or translatable drive element insofar as the part of the chain that extends linearly between the sprockets translates in direction PI or P2 during operation of the drive system.
  • Other kinematically equivalent devices could be used in lieu of roller chain 220.
  • a lift chain one example of which is seen in FIG. 13 A, could serve as a translatable drive element.
  • the primary gear is operatively connected to the deck panel 72.
  • actuator 90 extends and pushes framework beam 58 longitudinally toward the head end 12 of the bed.
  • the compression link 74 rotates clockwise to change the angular orientation a of the upper body deck framework.
  • the longitudinal translation of the framework relative to the elevatable frame causes primary gear 124 to rotate in a clockwise direction as seen in FIGS. 5 A, 8 A, 9 A and 10A.
  • the primary gear drives the panel drive sprocket 170 in the same rotational sense.
  • the sprocket drives the chain which acts on slider 200 to translate deck panel 72 in direction PI relative to deck framework 50. Retraction of the actuator reverses the above described motion to translate the deck panel in direction P2.
  • the kinematic interaction between the gear rack 102 and the primary gear 124 serves as a means for converting the relative translation and/or rotation between the deck framework and the elevatable frame to a rotary motion of primary gear 124.
  • the kinematic interaction between sprocket 170 and chain 220 serves as a means for converting the rotary motion to a translational motion.
  • the slider 200 and lug 218 serve as a means for conveying the translational motion of the chain to the panel.
  • FIG. 14A is a simple schematic view showing the kinematic relationship of the actuator 90, elevatable frame 28, deck framework 50 and compression link 74 of the above described bed structure.
  • Joint 78 is non-translatable relative to frame 28. As indicated in FIG. 14 A, operation of actuator 90 causes deck panel 72 to translate
  • joint 78 is longitudinally translatable relative to the frame by the action of second actuator 222.
  • deck framework 50 can be translated longitudinally relative to the elevatable frame 28 without any rotation of the framework (FIG. 15AB) rotated relative to the elevatable frame without any translation (FIG. 15 AC) or rotated and translated as in the first embodiment (FIG. 15 AD).
  • second actuator 222 introduces additional complexity, it also introduces additional flexibility that may be desirable.
  • the motion converter described herein is responsive to relative motion between the frame and the deck framework irrespective of whether that relative motion is translation, rotation, or a combination thereof, it is equally applicable to the embodiments of both FIGS. 14A and 15 A. It will be appreciated that kinematic equivalents of various components of the motion converter can be used in lieu of the illustrated components.
  • belts and pulleys can be used instead of chain 220 and sprockets 170, 192; a notched or toothed belt and mating gears can also be substituted for the chain and sprockets; a roller and a track with a high coefficient of friction (to prevent roller skidding) might be substituted for the gear 124 and rack 102.
  • the subject matter described herein relates to occupant support surfaces, such as hospital bed mattresses having microclimate management capabilities, and to methods and systems for controlling the evaporative performance and heat withdrawal performance of the support surface.
  • MCM microclimate management
  • the MCM-capable support surface may be a topper installed on a mattress, or may be the mattress itself. Effective microclimate management can benefit a bed occupant by resisting or mitigating the effects of skin tissue breakdown.
  • a typical MCM-capable support surface has provisions for receiving and discharging a stream of air. At least that portion of the support surface upon which the occupant rests is vapor permeable. In operation, a stream of air flows through the interior of the support surface. Provided the air is cooler than the occupant's skin, the internal airstream acts as a heat sink to keep the occupant's skin cool, thereby reducing the metabolic demands of the skin tissue and, as a consequence, reducing the likelihood that the occupant will develop pressure ulcers.
  • heat transfer from the occupant's skin can cause molecules of perspiration present at the interface between the support surface and the occupant's skin to acquire enough energy to break free, i.e. evaporate, from the liquid perspiration.
  • the liberated molecules migrate through the vapor permeable portion of the occupant support, and are carried away in the internal airstream.
  • the attendant moisture reduction at the skin/surface interface is beneficial because dry skin is less vulnerable to tissue breakdown than wet skin provided the skin is not excessively dry.
  • the evaporation is the result of heat transfer from the occupant, the occupant experiences an evaporative cooling effect above and beyond the above described dry flux.
  • the wet flux component of heat transfer materializes only when the occupant is perspiring and depositing liquid phase perspiration at the skin/surface interface.
  • the air flowing through the MCM-capable surface is ambient air (e.g. air from a hospital room), unconditioned in the sense that no temperature and/or humidity conditioning has been applied to the air above and beyond the conditioning applied by the hospital heating, ventilating and air conditioning (HVAC) system.
  • HVAC heating, ventilating and air conditioning
  • a method for controlling performance of an MCM capable support surface having a flowpath for guiding a stream of air along at least a portion of the surface comprises specifying a desired evaporative performance greater than an evaporative performance achievable with unconditioned ambient air, chilling the unconditioned ambient air to a temperature at least as low as that required to achieve 100% relative humidity, thereby demoisturizing the air, and supplying the chilled, demoisturized air to the flowpath.
  • the method may also include the step of heating the chilled, demoisturized air prior to the step of supplying it to the flowpath.
  • FIG. IB is a schematic, side elevation view of a bed having an MCM-capable support surface.
  • FIG. 2B is a view taken in the direction 2—2 of FIG. IB.
  • FIG. 3B is a schematic of a microclimate management system including a chiller and a water collection system as disclosed herein.
  • FIG. 4B is a schematic of a microclimate management system similar to that of FIG. 3B but also including a heater.
  • FIG. 5B is a block diagram of an algorithm for controlling evaporative capacity of a support surface.
  • FIG. 6B is a graph showing vapor pressure of water as a function of temperature and including data symbols corresponding to numerical examples described herein.
  • FIG. 7B is a view taken in direction 7—7 of FIG. 2B showing a nucleation device comprising an array of vertically oriented fibers.
  • FIGS. 8BA and 8BB are views of a user interface showing two possible ways for permitting a caregiver to specify a desired performance of the microclimate management system.
  • a bed 20 has a support surface 22 with microclimate management (MCM) capability.
  • MCM-capable support surface is depicted as a topper installed on top of a non-MCM-capable mattress, but could instead be the mattress itself.
  • the support surface supports an occupant 24.
  • the support surface comprises a material layer 26 bounding and at least partly defining an internal fluid flowpath 30.
  • Portion 32 of the support surface is the portion upon which the occupant rests, and is vapor permeable.
  • the support surface includes an air intake 36 and an air exhaust vent 38. During operation a stream 40 of air flows through the flowpath to serve as a sink for heat and water vapor.
  • the bed also includes a user interface 42 for receiving user instructions concerning the operation of a microclimate management system (FIGS. 3B, 4B).
  • the illustrated user interface includes a keypad 44 for receiving the user's instructions and a display panel 46 for conveying information to the user.
  • the bed also includes a controller 50, responsive to the user's instructions, for controlling the microclimate management system.
  • the microclimate management system includes a chiller 60, a water collection system 62 and, in one embodiment, a heater 64.
  • dry heat transfer is proportional to temperature difference and is independent of the presence or absence of liquid phase perspiration at the occupant/surface interface.
  • DFC dry flux capacity
  • the dry heat transfer actually realized during operation of the system described herein is the actual dry flux, DF. Because the dry heat transfer is independent of whether or not liquid phase perspiration is present at the
  • the actual dry flux DF equals the dry flux capacity DFC:
  • R DRY is a property of the MCM-capable surface 22, (particularly portion 32 of the support surface) in combination with the condition (e.g. temperature and flow rate) of the air stream 40 and the proximity of the airstream to the occupant's skin.
  • R DRY is a system constant that characterizes the resistance of the support surface and airstream to dry heat flow.
  • the inverse, 1/R DRY has units of power per unit area per temperature degree, for example watts/meter 2 /°C. Low values of R DRY correspond to high heat transfer; high values of R DRY correspond to low heat transfer. In the examples presented below R DRY has a value of 0.300 (m 2o C)/watt.
  • T SKIN is the temperature of the occupant's skin at the occupant/surface interface.
  • T SKIN has units of temperature such as degrees Centigrade (°C);
  • T STREAM is the temperature of the air stream 40.
  • T S TREAM can be approximated as being equal to the ambient room air temperature, T AMBIE N T - Such an approximation neglects the effect of temperature changes imparted to the ambient air as it travels to and through the topper. These temperature changes may be due to a number of factors such as temperature changes associated with pressurizing the room ambient air to cause it to flow through the topper, heat transfer arising from heat rejection by nearby electronic components, and heat transferred into the airstream from the occupant.
  • T STREAM has units of temperature such as degrees Centigrade (°C).
  • Dry flux capacity DFC and dry flux DF have units of power per unit area, for example watts/meter 2 .
  • R DRY The value of R DRY for a given system can be determined experimentally by way of a "dry plate test".
  • a dry test plate heated to a test temperature of 36°C (a reasonable "standard” human skin temperature based on extensive measurements) is placed on a surface.
  • a stream of air at a known temperature lower than 36°C is caused to flow along the opposite side of the surface. Energy is supplied to the plate at a rate sufficient to maintain its
  • Equation (1) can then be solved for R DRY .
  • the second mechanism of heat transfer is proportional to the difference in the partial pressure of water vapor (perspiration) at the occupant's skin and the partial pressure of water vapor in the airstream 40.
  • the potential of the support surface to effect wet heat transfer is its wet flux capacity, WFC.
  • WFC wet flux capacity
  • the wet heat transfer actually realized during operation of the system described herein is the actual wet flux, WF.
  • the wet flux capacity WFC is realized as actual wet flux WF when perspiration is available for evaporation at the skin/surface interface.
  • the rates of potential and actual wet heat transfer are referred to as wet flux capacity WFC and wet flux WF respectively, and can be expressed as:
  • WFC (1/RwET) (PH20,SKIN - PH20,STREAM) (2A)
  • WF (1/RwET) (PH20,SKIN - PH20,STREAM) (2B)
  • R WET is a property of the MCM-capable support surface 22 (particularly portion 32 of the support surface) in combination with the condition (e.g. temperature and flow rate) of the air stream 40 and the proximity of the airstream to the occupant's skin.
  • R WET is a system constant that characterizes the resistance of the support surface and airstream to evaporative cooling. Its inverse, 1/R WET has units of power per unit area per unit pressure, for example watts/meter 2 /pascal. Low values of R WET correspond to high evaporative heat transfer; high values of R WET correspond to low evaporative heat transfer. In the examples presented below R WET has a value of 250 (m 2 Pa)/watt.
  • SKIN is the partial pressure of water vapor (perspiration) at the occupant's skin (i.e. at the occupant/surface interface) P H2O , SKIN has units of pressure such as Pascals (Pa); and
  • P H2 O,S TREAM is the partial pressure of water vapor in the airstream 40. If TS TREAM is approximated as being equal to T AMBIE N T , P H2 O,S TREAM can be approximated as being equal to the partial pressure of water vapor at room air ambient temperature. P H2O , STREAM has units of pressure such as Pascals (Pa).
  • equation 2A applies without restriction because it describes the potential or capacity of the system.
  • the applicability of equation 2B is restricted to those conditions when liquid perspiration is being deposited at the occupant/surface interface because it describes the actual wet heat transfer, which materializes only when liquid perspiration is being made available for evaporation.
  • Wet flux capacity WFC and wet flux WF have units of power per unit area, for example watts/meter 2 .
  • the value of R WET for a given system can be determined experimentally by way of a "wet plate test". First, a dry plate test is conducted as described above. The test is then repeated with a supply of water directed to the plate to ensure that the entire test plate remain
  • Equation (2) can then be solved for R WET -
  • RDRY and RWET are system specific constants, i.e. they are properties of the material used to make the surface, or at least the surface portion 32 of interest, of the condition of the airstream 40 passing through the support surface and of the proximity of the airstream to the occupant's skin.
  • the factors TSTREAM, TSKIN, PH20, STREAM and PH20,SKIN are environmental related factors because their values depend on the temperature and humidity of the room air and the conditions prevalent at the occupant's skin.
  • Total heat withdrawal capacity THWC is the sum of dry flux capacity DFC and wet flux capacity WFC.
  • Actual total heat withdrawal THW is the sum of dry flux DF and wet flux WF:
  • wet flux capacity and wet flux which have units of energy per unit time per unit area, as an evaporative capacity EC and an evaporative rate ER , which have units of mass (of water) per unit time per unit area.
  • EC evaporative capacity
  • ER evaporative rate
  • one watt/m 2 of wet flux capacity corresponds to 1.489 gm/hour/m 2 of evaporative capacity
  • one watt/m 2 of actual wet flux corresponds to 1.489 gm hour/m 2 of actual evaporative rate:
  • EC and ER are evaporative capacity and evaporative rate expressed in grams per hour per square meter
  • 1.489 is the inverse of the heat of vaporization of water at 36°C expressed in grams per joule
  • WFC and WF are wet flux capacity and actual wet flux expressed in grams per watt-hour.
  • Equation (1) (2A) and (2B)
  • equations (3A) and (3B) can be rewritten as:
  • THWC (1/RDRY)(TSKIN - TSTREAM) + (1/RWET)(PH20,SKIN - PH20,STREAM)(5A)
  • THW (1/RDRY)(TSKIN - TSTREAM) + (1/RWET)(PH20,SKIN -
  • equations (5A), (6A) and (7 A) can be used to determine the potential total heat withdrawal THWC and the evaporative capacity EC available to cool the bed occupant.
  • equations (5B), (6B) and (7B) can be used to determine the actual total heat withdrawal THW and evaporation rate applied to the bed occupant provided the condition for using those equations (the presence of perspiration available for evaporation at the occupant/surface interface) is met.
  • T SKIN can be determined from actual skin temperature measurements or can be represented by a standard value, such as 36°C.
  • P H2 O,S KI N can be represented as the partial pressure of water vapor at T SKI N and at the relative humidity prevailing at the occupant/surface interface. When there is liquid phase perspiration available for evaporation at the occupant/surface interface the relative humidity will be 100%. If a standard value of 36°C is used as the value of T SKI N, at 100% relative humidity, P H2 O,S KI N can be expressed as 5946 Pa. Alternatively, if a desired evaporative rate ERDESIRED is specified, the parameters RWET, RDRY, TSKIN, PH20,SKIN, room ambient air temperature T AMBIENT and room relative humidity RHAMBIENT can be used to calculate stream conditions
  • Equations 5C, 6C and 7C are rewritten below as equations 5C, 6C and 7C to reflect that evaporative rate is the user specified parameter whereas TSTREAM, PH20, STREAM, and THW are dependent parameters. Equations 5C through 7C assume the presence of perspiration to be evaporated at the skin / support surface interface.
  • THW (1/RDRY)(TSKIN - TSTREAM, REQUIRED) + ERDESIRED/ 1.489
  • Equations 5, 6 and 7 are rewritten below as equations 5D, 6D and 7D to reflect that THW is the user specified parameter whereas stream conditions TSTREAM, PH20, STREAM and EC are dependent parameters. Equations 5D through 7D assume the presence of perspiration to be evaporated at the skin / support surface interface.
  • THWDESIRED (1/RDRY)(TSKIN - TSTREAM,REQUIRED) +
  • THWDESIRED (1/RDRY)(TSKIN - TSTREAM, REQUIRED) +
  • FIG. 6B shows pressure expressed in pascals (Pa) as a function of temperature expressed in °C.
  • Line VP represents the vapor pressure of water, and may also be referred to as the saturation line or as a line of 100% relative humidity, RH.
  • the circular symbol represents a perspiring bed occupant whose skin temperature T S KIN is 36°C. Because of the perspiration at the occupant/support surface interface, the relative humidity at the interface is 100% which, at 36°C, corresponds to a vapor pressure of 5946 Pa.
  • the square symbol represents room ambient air, having a temperature of 25.6°C and a relative humidity of 75%, corresponding to PH2O,AMBIENT of 2451 Pa.
  • ER 20.8 gm/hr/m 2 , corresponding to a partial pressure difference of 3495 Pa;
  • controller 50 commands operation of chiller 60 to chill the ambient air to 16.8°C (triangular symbol), which is lower than the 20.8°C temperature required for the ambient air to be brought to a condition of 100% relative humidity (elliptical symbol).
  • the chilling from 25.6°C to 20.8°C lowers the temperature of the air at a constant partial pressure of water vapor until relative humidity rises to 100%.
  • This segment of the chilling process increases the dry flux capacity of the air (and also increases the actual dry flux) but, due to the absence of any change in partial pressure, does not increase its wet flux capacity or the actual wet flux.
  • the cooling from 20.8°C to 16.8°C proceeds along saturation line VP and causes water vapor to condense, thereby demoisturizing the air (i.e. removing water molecules from the mixture of gas phase H 2 0 molecules and gaseous air).
  • This segment of the chilling process has the intended effect of increasing wet flux capacity WFC and actual wet flux WF, and therefore evaporative capacity EC and evaporation rate ER (due to the reduction in partial pressure from 2451 Pa to 1916 Pa) and also further increases dry flux capacity and dry flux (due to the additional temperature reduction from 20.8°C to 16.8°C).
  • the water removal system 62 drains or otherwise removes the liquid water.
  • the illustrated water removal system includes a nucleation device 66 to promote and enhance the efficiency of the transition from the gaseous phase to the liquid phase.
  • a nucleation device is a device having an array of vertically oriented fibers 68 projecting into airstream 40. The fibers converge into a funnel 70. Water droplets collect on the fibers. The weight of the water droplets causes them to migrate down the fibers where they drip into the funnel, which channels the water out of the system. The chilled, demoisturized air is then supplied to the support surface internal flowpath 30 where its enhanced dry flux capacity and wet flux capacity are manifested as actual heat transfer.
  • Table 1 compares the performance parameters of the microclimate management system using unconditioned ambient air (25.6°C and 75% RH) and air chilled air as described above. Note that the 31.4 gm/hr/m 2 increase in total heat withdrawal comprises 2.1 gm hr/m 2 of wet flux and 29.3 gm/hr/m 2 of dry flux. Of the 29.3 gm/hr/m 2 of dry flux, 13.3 gm hr/m 2 is dry flux resulting from the cooling required to achieve the 2.1 gm/hr/m 2 of wet flux.
  • the above described method and system may, as a consequence of increasing the evaporative rate, result in more total heat withdrawal than is desired, a condition referred to herein as "overchilling".
  • the evaporative benefit of increasing the evaporative rate from 20.8 to 24.0 gm hr/m 2 may be desired, but at least some of the total heat withdrawal may not be.
  • Such a condition can be mitigated by using a heater 64 to heat the chilled,
  • demoisturized air prior to the step of supplying it to flowpath 30.
  • the heater would be operated only if it were determined that the temperature of the chilled air was, or would be, unsatisfactorily low.
  • the heating causes the temperature of the chilled, demoisturized air to increase from 16.8°C to a higher value, for example 19.0°C (hexagonal symbol).
  • the heating step has no effect on the partial pressure of the water vapor in airstream 40, and hence no effect on the evaporative rate.
  • the temperature increase reduces the dry flux (in comparison to the dry flux at 16.8°C).
  • Table 2 summarizes the change in performance parameters of the microclimate management system using air chilled to 16.8° compared to air reheated to 19.0°C.
  • Table 3 presents a similar comparison relative to the use of unconditioned ambient air at 25.6°C and 75% RH.
  • FIG. 6B also shows one example in which no liquid phase perspiration is being deposited at the occupant/surface interface.
  • the example assumes 90% relative humidity and a temperature of 36°C at the interface (quarter circle symbol). Accordingly, P H2O , SKIN is about 5351 Pa.
  • a calculation of wet flux capacity WFC would show a potential for 9.2 watts/m 2 of heat transfer.
  • the corresponding calculation of evaporative capacity would show a potential to remove about 13.7 gm/hour/m 2 of moisture (perspiration) from the occupant/surface interface.
  • these values of heat transfer and evaporation can be realized only if dry heat transfer first reduces the temperature to about 34.1 °C (the temperature corresponding to 100% relative humidity at 5351 Pa).
  • FIG. 5B is a block diagram of an algorithm for enhancing evaporative capacity of an MCM-capable support surface beyond that which could be achieved with unconditioned ambient air.
  • the numerical values to the right of the diagram blocks are from the above examples, using 36°C as the value for T SKIN , and 5946 Pa, the vapor pressure of water at 36°C and 100%) RH, as the value for P H2 O,S KI N-
  • the algorithm calculates P H2 O, AMBIE N T , the partial pressure of water vapor at the prevailing ambient conditions, as a function of relative humidity and the vapor pressure of water, P VAPOR , which is a function of ambient temperature, AMB:
  • P VAPOR may be determined in any convenient way, for example by using a lookup table consistent with saturation line VP of FIG. 6B or by an equation, such as third order equation (9), which gives vapor pressure in pascals as a function of temperature in °C.
  • Equation (9) models the saturation line satisfactorily between about 10°C and 40°C:
  • Block 102 uses equations (2) and (4) to calculate ER AMBIE N T , the evaporative rate achievable with ambient air, assuming the presence of perspiration to be evaporated at the skin / support surface interface.
  • Block 104 assess whether or not a desired value of evaporative rate input by a user by way of keypad 44 exceeds the evaporative rate achievable with the unconditioned ambient air. If not the controller takes a "corrective action" at block 106 such as commanding display panel 46 to display one or more messages such as a message to prompt the user for an alternate desired value, a message offering guidance as to what evaporative rate values are acceptable, or a message asking the user to confirm that the evaporative rate achievable with ambient air is satisfactory. After the user provides an acceptable, desired evaporative rate, for example 24 gm/hr/m 2 , the algorithm proceeds to block 108.
  • a "corrective action" at block 106 such as commanding display panel 46 to display one or more messages such as a message to prompt the user for an alternate desired value, a message offering guidance as to what evaporative rate values are acceptable, or a message asking the user to confirm that the evaporative rate achievable with ambient air is satisfactory.
  • the algorithm proceeds to block 108
  • the algorithm uses equation (7B) to calculate P H2 O,S TREAM , RE QU IRED , the partial pressure of water vapor required to achieve the desired evaporative rate.
  • PH2O,STREAM,REQUIRED determined at block 108.
  • the algorithm determines the difference ⁇ between ambient temperature and the required temperature determined at block 110, and assesses whether or not the ⁇ is within the known capability ⁇ ⁇ of the chiller. If not, the controller takes a "corrective action" 116 such as commanding display panel 46 to display one or more messages such as a message to prompt the user for an alternate desired value of evaporative rate, or a message offering guidance as to what evaporative rate values are achievable. After the user provides an acceptable desired evaporative rate, the algorithm repeats the appropriate steps starting at block 104, and proceeds to block 118.
  • a "corrective action" 116 such as commanding display panel 46 to display one or more messages such as a message to prompt the user for an alternate desired value of evaporative rate, or a message offering guidance as to what evaporative rate values are achievable.
  • the controller causes chiller 60 to operate to chill the ambient air to the required temperature, T STREAM , RE QU IRED , determined at block 1 10.
  • the controller determines if chilling the ambient air to the required temperature determined at block 110 would result in an overchill condition.
  • the test for overchill can take various forms, for example a pre-emptive or corrective command from a user, or a predefined limit for a particular occupant, a particular class of occupants or a limit established by a facility protocol. If the overchill test is not satisfied, the algorithm proceeds to block 122. If the test is satisfied, the algorithm proceeds to block 124 where the controller causes heater 64 to operate to heat the chilled, demoisturized air. The algorithm then proceeds to block 122.
  • the algorithm determines one or more microclimate performance parameters and causes the parameters to be displayed on display panel 46.
  • Table 4 lists examples of parameters of possible interest along with their numerical values from the above example.
  • the principles disclosed herein can be used to allow the user to manage the performance of an MCM-capable support by specifying a target total heat withdrawal, rather than by specifying an evaporative rate. If dry flux alone is sufficient to achieve the target total heat withdrawal, the chiller is operated to chill the ambient air (square symbol) to a temperature low enough to achieve the desired target heat withdrawal (e.g. the diamond symbol). This temperature is, by definition, higher than the temperature
  • the chiller is operated to cool the air to a temperature at least as low as that required to achieve 100% relative humidity (20.8°C) and also low enough to achieve the target total heat withdrawal (e.g. the domed symbol). Because achieving the target total heat withdrawal involves a wet flux component in addition to the dry flux component, the heat withdrawal will also cause airstream 40 to exert a drying influence on the bed occupant. If this results in excessive dryness, it may be desirable or necessary to sacrifice some of the wet flux.
  • limit 52 is proportional to a predefined wet flux limit. Observance of the limit restricts operation of the chiller to achieving the total heat withdrawal at the wedge symbol.
  • Table 5 shows example performance parameters of the system using ambient air (column 1), air chilled to achieve a total heat withdrawal of 58 watt/m 2 (column 2), air cooled to achieve a total heat withdrawal of 77 watt/m 2 (column 3) and air cooled to limit line 52 to achieve a total heat withdrawal of 67 watt/m 2 (column 4).
  • a caregiver would specify a desired numerical value of evaporative rate (mass per unit time per unit area) or total heat withdrawal (power per unit area).
  • the user interface could present the user with a discrete scale extending from "0" to "10", a continuous scale extending from minimum evaporative rate or total heat withdrawal to a maximum evaporative rate or total heat withdrawal, or some other less technical means for specifying desired performance of the system.
  • the present disclosure is related to sensors for monitoring the position of a patient in a patient-support apparatus. More specifically, the present disclosure is related to monitoring patient movement in a patient-support apparatus with sensor that is spaced apart from the patient-support apparatus.
  • a care environment such as a hospital
  • the movement of patients is monitored for safety.
  • patient monitoring systems have been developed to alert a caregiver if the patient has exited their bed.
  • a sensor mat is used to determine the presence of the patient.
  • Additional development of hospital beds with integrated scale systems has also resulted in systems that monitor the sensed weight to determine if the patient had exited the bed, and if so, to signal to a nurse call system of that condition.
  • sensors have been employed to detect movement of patients to determine sleep patterns, detect seizures, or to detect incontinence.
  • Such sensors are generally supported on or near a patient-support apparatus with cords or wires connecting the sensors to
  • cords and wires must then be disconnected when the patient-support apparatus is moved from the room.
  • the cords and wires present trip hazards and wire management issues in the patient room.
  • a monitoring system for monitoring a patient in a patient-support apparatus comprises a detector, a standard, and a controller.
  • the detector is operable to detect electromagnetic radiation within a detection field.
  • the standard is positioned in the detection field and conveys electromagnetic radiation having a predetermined signature to the detector.
  • the controller is coupled to the detector and includes a processor and a memory device coupled to the processor.
  • the memory device includes instructions that, when executed by the processor, cause the controller to evaluate data received from the detector.
  • the data received by the detector includes all of the electromagnetic radiation in the detection field.
  • the electromagnetic radiation in the field is compared to the signature of the standard to determine if changes in the electromagnetic radiation are indicative of movement of a person in the detection field.
  • the memory device may also include instructions that, when executed by the processor, cause the controller to output a signal if the changes in the electromagnetic radiation are indicative that movement of a person in the detection field exceeds a threshold value.
  • the signal may be output to a local alarm near the patient-support apparatus.
  • the system further includes a remote station that is spaced apart from the detection field and coupled to the controller, and wherein the signal is transmitted to the monitoring station.
  • the local alarm or the remote station may each generate either a visual or an audible alarm. In some embodiments, both a visual and an audible alarm are generated.
  • the electromagnetic radiation detected by the detector is in the visible spectrum. In some embodiments the electromagnetic radiation detected by the detector is in the infra red spectrum.
  • the system may further comprise a second detector operable to detect electromagnetic radiation within at least a portion of the detection field of the first detector. When present, the second detector is coupled to the controller.
  • the memory device may further include instructions that, when executed by the processor, compare electromagnetic radiation received by the second detector to electromagnetic radiation received by the first detector and to the signature of the standard to determine if changes in the electromagnetic radiation detected by the first detector are indicative of movement of a person in the detection field.
  • the memory device may further include instructions that, when executed by the processor, cause the controller to output a signal if the changes in the electromagnetic radiation sensed by both the first and second detector are indicative that movement of a person in the detection field exceeds a threshold value.
  • the signal may be transmitted to the local alarm or the remote station.
  • the controller may communicate wirelessly to the local alarm and the remote station, or the controller may have a hardwired connection to either the local alarm or the remote station.
  • the standard may be portable in some embodiments.
  • the memory device may include instructions that, when executed by the processor, cause the system to determine a physical position of the portable standard.
  • the physical position may define a datum and changes in the electromagnetic radiation detected by the detector may be compared to the datum to determine if the changes in the electromagnetic radiation are indicative of movement of a patient on the patient-support apparatus.
  • the signature of the standard defines a datum and the system evaluates changes in electromagnetic radiation relative to the datum to determine if a patient on the patient-support apparatus has moved from an initial position.
  • the system comprises a plurality of standards each having a predetermined signature.
  • the memory device may include instructions that, when executed by the processor, cause the system to monitor changes in the position of each of the plurality of standards.
  • the memory device may also include instructions that, when executed by the processor, cause the system to determine if one or more of the plurality of standards is in an unacceptable position.
  • the system generates a signal indicative of the unacceptable position and transmits the signal to a remote station spaced apart from the patient- support apparatus.
  • the memory device includes instructions that, when executed by the processor, cause the system to evaluate the electromagnetic radiation to determine a location of a patient supported on the patient-support apparatus.
  • the system may compare the location of the patient to the standards to determine if the patient is in an unacceptable position.
  • the position of the patient may be determined by determining a centroid of the patient.
  • the centroid of the patient may be determined by weighting components of the thermal profile of the patient to determine a thermally weighted centroid.
  • a method of monitoring a position of patient in a patient-support apparatus includes monitoring electromagnetic radiation in a detection field, establishing a reference based on a standard in the detection field, and monitoring changes in the electromagnetic radiation in the detection field to determine if there is movement relative to the standard.
  • the reference may be established based on a plurality of standards.
  • the method may further include generating a notification if the movement relative to the standard exceeds a threshold.
  • the notification may be generated proximate to the patient-support apparatus.
  • the notification may be generated at a location spaced apart and separate from the patient-support apparatus.
  • the position of the patient may be estimated by determining a centroid of the patient.
  • the centroid of the patient may be determined by evaluating the thermal profile of the patient to determine a thermal centroid.
  • Fig. 1C is a perspective view of a patient supported in a supine position on a patient-support apparatus in hospital room with an sensor positioned above the patient-support apparatus such that the patient-support apparatus is positioned in the field of view of the sensor;
  • Fig. 2C is a top view of the patient-support apparatus of Fig. 1C
  • Fig. 3C is a perspective view similar to Fig. 1C with articulated sections of the patient-support apparatus moved to place the patient reclined position with the patient's head and knees raised;
  • Fig. 4C is a top view of the patient-support apparatus in the position shown in Fig. 3C;
  • Fig. 5C is a top view similar to the top view of Fig. 2C, with the patient in Fig. 5C shown positioned closer to the foot end of the patient-support apparatus;
  • Fig. 6C is a diagrammatic representation of a patient-monitoring system.
  • Fig. 7C is a diagrammatic representation of another embodiment of a patient- monitoring system.
  • a patient monitoring system 10 includes a sensor 12 that is operable to detect electromagnetic radiation such as infrared radiation or light waves in the visible spectrum.
  • the sensor 12 detects electromagnetic radiation in a field of view 14 which defines a detection zone.
  • the electromagnetic radiation received by a detector 16 in the sensor 12 with optical elements such as lenses and filters as is well known in the art focusing the electromagnetic radiation.
  • the sensor 12 is positioned on a ceiling 22 of a patient room 18.
  • the detection zone 14 of the sensor 12 is positioned in a known location such that a patient-support apparatus 20 may be positioned in the patient room 18 so that the
  • electromagnetic radiation in the area of the patient-support apparatus 20 is detected by the sensor 12.
  • the patient-support apparatus 20 includes a number of barrier elements including a patient-right head siderail 26, a patient-left head siderail 28, a patient-right foot siderail 30, and a patient-left foot siderail 32.
  • the patient- support apparatus may include a headpanel 34 and a footpanel 36.
  • the patient-support apparatus 20 includes a number of support sections including an articulated head section 38 pivotable relative to an intermediate frame 46.
  • An articulated thigh section 42 is also pivotable relative to the intermediate frame 46 and an articulated foot section 44 is pivotable relative to the thigh section 42.
  • the support sections are supported on the intermediate frame 46 and the articulated sections 38, 40, 42.
  • the intermediate frame 46 is supported above a base frame 48 and movable relative to the base frame 48 by a lift system 50 as is well known in the art.
  • a number of standards 62, 64, 66, 68, 70, and 72 are positioned on various elements of the patient-support apparatus 20 so that references points may be established on the patient-support apparatus 20.
  • the standards 62, 64, 66, 68, 70, and 72 are configured to reflect a particular wavelength of light when illuminated so that the system 10 may identify the standards 62, 64, 66, 68, 70, and 72 by the reflected wavelength.
  • the standards 62, 64, 66, 68, 70, and 72 may reflect widely varying wavelengths in a relatively small or clustered area such that the system 10 can discriminate the cluster of varying wavelengths from the environment in the patient room 18 to determine the location of a particular one of the standards 62, 64, 66, 68, 70, and 72.
  • the standards 62, 64, 66, 68, 70, and 72 may be an electromagnetic radiation emitter that generates a particular radiation signature which may be discriminated by the system 10 to determine the position of the standards 62, 64, 66, 68, 70, and 72.
  • a first standard 62 is shown to be positioned on the headpanel 34 and a second standard 64 is positioned on the footpanel 36 with each of the standards 62 and 64 being centered on the respective panels.
  • the standards 62 and 64 define a longitudinal axis 52 of the patient-support apparatus 20 which may be utilized by the system 10 when the system 10 is evaluating electromagnetic radiation in the field 14.
  • the longitudinal axis 52 serves as a datum against which movement detected by the system 10 is compared to make determinations as to whether the detected movement exceeds a predetermined threshold or is of such a magnitude that it may be indicative of certain characteristics of the patient 40 supported on the patient-support apparatus 20.
  • the standards 66, 68, 70, 72 form the vertices of a four sided polygon 54 that is detected by the system 10. The position of the patient 40 supported on the patient-support apparatus 20 may also be compared to the polygon 54 to determine if the patient 40 is outside of an acceptable position on the patient-support apparatus 20. In addition, the standards 66, 68, 70, 72 also allow the system 10 to determine if the respective side rails 26, 28, 30, 32 are in a raised or lowered position.
  • the side rails 26, 28, 30, 32 are spaced laterally inwardly toward the axis 52 when the side rails are in a lowered position as compared to the lateral position in a raised position.
  • Fig. 4C it can be seen that the side rails 26, 30 on the patient right side of the patient-support apparatus 20, which are in a raised position, are positioned such that the standards 66, 70 positioned on the side rails 26, 30 respectively, are spaced away from the longitudinal axis 52 by a distance X.
  • the system 10 compares the positions of the standards on the respective side rails to the longitudinal axis 52 to determine if each of the side rails is in a raised or lowered position.
  • the polygon 54 is detected from an overhead position. Because the head and side rails 26, 28 move with the head section 38, while the foot side rails 30, 32 are fixed to the intermediate frame 46, raising of the head section 38 results in a change in the dimensions of the polygon 54 as viewed by the sensor 12. Comparing the polygon 54 in Fig. 4C to the polygon 54 in Fig. 5C, it can be seen that when the head section 38 is raised as in Fig. 4C, a length dimension 56 of the polygon 54 is reduced. By monitoring the changes in the position of the standards and changes in the dimensions between the standards, the system 10 is able to discern changes in the position of the sections 38, 40, 42, 44 and frames 46, 48 of the patient-support apparatus 20. Comparing the information concerned about the position of the patient-support apparatus 20 members, to a detected position of a patient 40 supported on the patient-support apparatus 20, the system can determine if the patient 40 is moving or is out of acceptable position on the patient-support apparatus 20.
  • the senor 12 includes a detector 16.
  • the detector 16 is a charge coupled device (CCD) capable of receiving an image from the detection zone 14.
  • CCD charge coupled device
  • the detector 16 operates in the visible spectrum and compares an initial image of the patient 40 and patient-support apparatus 20 changes in the image over time to discern how a patient 40 has changed position over time. If the patient's position has changed sufficiently to indicate and unacceptable position, the system 10 will generate an alarm which may be visual or audible in the patient room 18, or it may be transmitted to a monitoring station 58 in the patient room 18 as indicated in Figs. 6C and 7.
  • the system 10 To detect movement of the patient 40, the system 10 must evaluate changes in a characteristic of the patient 40.
  • Each person has a center of mass 60 which is generally located in the torso.
  • the center of mass 60 is estimated by determining the centroid of the portion of the patient 40 visible to the sensor 12.
  • the centroid 60 of the patient 40 is determined using geometric decomposition. The centroid of multiple simple shapes detected by the system 10 is first determined, and then the positions of each of the centroids of the simple shapes are averaged, weighted by the area of the simple shape used for each centroid.
  • changes in the position of the centroid 60 may be used to determine if the patient 40 is properly positioned or is moving in a manner which indicates the patient 40 will attempt to exit the patient-support apparatus 20.
  • the analysis requires the system tlO to determine what in the detection zone 14 can be properly assigned to being a portion of the patient 40 and what in the view is environment.
  • the system 10 may be taught the location of the centroid 60 by a user who positions a movable standard 74 on the patient's torso and synchronizing the position of the standard 74 with the system 10.
  • the system 10 then monitors the area around the taught centroid 60 to determine if the patient 40 has moved relative to the fixed standards on the patient-support apparatus 20.
  • the movable standard 74 may be attached to the patient 40 so that movement of the patient 40 results in movement of the standard 74, which approximates the centroid of the patient 40.
  • the detector 16 is configured to detect electromagnetic radiation in the infrared spectrum. This significantly simplifies the the determination of the centroid 60 of the patient 40.
  • the system 10 is configured to accept that any electromagnetic radiation in the field of view that indicates a temperature of greater than a predetermined threshold, such as 85°F, for example, is assumed associated with the patient 40.
  • a centroid 60 may be determined based simply on an average position of the areas associated with the patient 40. For additional accuracy, the centroid may be weighted by both position and temperature so that a heat based centroid may be determined. Movement of the centroid 60 of the patient 40 relative to the standards 62, 64, 66, 68, 70, and 72 is then monitored by the system 10 to monitor the patient's movement.
  • the system 10 may compare the position of the patient 40 to the standards 62, 64, 66, 68, 70, and 72 to determine that the patient 40 has moved to a position in which the patient 40 is at risk for injury.
  • the patient 40 is shown to have migrated toward the footpanel 36 so that the patient's back is being supported by the thigh section 42 and the patient 40 is in an improper position.
  • the centroid 60 of the patient 40 in Figs. 3C and 4C is positioned outside of the polygon 54 and is spaced away from the polygon 54 by a distance Z.
  • the system 10 may alert a caregiver that the patient 40 is out of position and should be re-positioned to the optimal position.
  • the patient 40 is shown to be migrated to the patient-right side of the patient-support apparatus 20 in Fig. 5C.
  • the system 10 may send signal indicative that the patient 40 is out of position, resulting in an alarm either in the room 18 or at the remote station 58.
  • the shape of the polygon 54 may be used to determine if one or more siderails 26, 28, 30, or 32 are in a lowered position.
  • the system 10 may detect positioning or movement of a patient 40 with respect to a single standard, such as standard 62, for example.
  • the standard 62 positioned on the headpanel 34 defines a fixed position and is indicative of an orientation defining the axis 52. Movement of the centroid 60 relative to the standard 62 and axis 52 provides sufficient information for the system 10 to determine if the patient 40 is moving relative to the patient-support apparatus 20 or if the patient 40 is in an unacceptable position such as that shown in Figs. 3C and 4C or Fig. 5C.
  • a patient monitoring system 110 may include multiple detectors 16, 116 as shown in Fig. 7C. Each of the detectors 16, 116 may be positioned in different known locations on the ceiling 22 with the detectors 16, 116 each configured to have the same detection zone 14. The system 110 may then process data from each of the detectors 16, 116, comparing the data from each of the different detectors 16, 116 to determine information about the patient 40 and position of the members of the patient-support apparatus 20.
  • one sensor 12 may have a detector 16 used to detect electromagnetic radiation in the visible spectrum and a second sensor 12 may have a detector 116
  • Fig. 7C shows two detectors 16, 116
  • other embodiments may include additional sensors 12 each with an associated detector 16 with the system utilizing data from all of the sensors 12 to determine information about the patient 40 or patient-support apparatus 20 in the detection zone 14.
  • Each system 10, 110 includes at least one sensor 12, and one or more standards
  • the controller 80 includes a processor 82 and a memory device 84.
  • the processor 82 utilizes data and algorithms stored in memory 84 to analyze data from the sensor 12 as described above.
  • the controller 80 will monitor the location of the patient 40 relative to the standards 62, 64, 66, 68, 70, and 72 so that the location of the patient 40 relative to the members of the patient-support apparatus 20 is monitored.
  • the controller 80 will indicate an alarm condition to a local alarm 86 positioned in the room 18.
  • the local alarm 80 may provide either a visual indication of the alarm condition or an audible indication of the alarm condition, or both a visual and audible indication.
  • the controller 80 may also provide a signal to the remote station 58 and the remote station 58 will generate an indication of the alarm condition at the location of the remote station 58.
  • the remote station 58 is positioned apart from the patient room 18 so that a caregiver in a remote location is apprised of the alarm condition.
  • the controller 80 may communicate with the local alarm 86 ore remote station 58 through either a hard- wired connection or a wireless connection.
  • the remote station 58 may generate either an audible or visual indication of the alarm condition, or both an audible and visual indication.
  • one of the standards 62, 64, 66, 68, 70, and 72 may provide a signal to the sensor 12 that is indicative of the specific patient-support apparatus 20 in the field 14.
  • the sensor 12 may then identify the specific patient-support apparatus 20 identification to the remote station 58 such that a hospital information system in communication with the remote station 58 may associate the specific patient-support apparatus 20 to the specific room 18.
  • the system 10 may also monitor the standards 62, 64, 66, 68, 70, and 72 to determine the position of various members of the patient-support apparatus 20 and provide the position data to the hospital information system through the remote station 58.
  • the system 10 may monitor siderail position, bed elevation, articulated section positions, the amount of tilt of the intermediate frame.
  • the standards 62, 64, 66, 68, 70, and 72 are shown to be positioned on specific members of the patient-support apparatus 20 in the illustrative embodiment, other standards may be positioned on various members of the patient-support apparatus 20 such that one or more sensors 12 may monitor the location of the various standards, and thereby, members to monitor the position of the position of the members of the patient-support apparatus 20.
  • the system 10 may be used to monitor other characteristics of the patient 40 for vigilance monitoring. For example, by monitoring cyclical changes in position, the system 10 may monitor the respiration rate of a patient 40 on patient- support apparatus 20. Changes in the temperature profile of the patient 40 may also be used to detect incontinence of the patient. Still also, the system 10 may detect the patient's body temperature.
  • This disclosure relates generally to person- support apparatuses. More particularly, but not exclusively, one illustrative embodiment relates to a person-support apparatus with fluid tank receptacle.
  • Person-support apparatuses in hospitals can often have fluid tanks coupled thereto that can be used to supply fluid to a person supported on the person-support apparatus. While various devices have been developed, there is still room for development. Thus a need persists for further contributions in this area of technology.
  • One illustrative embodiment of the present disclosure can include fluid tank receptacle with a cage configured to extend from the upper frame a first distance to support a fluid tank when it is positioned in the fluid tank receptacle and retract toward the upper frame such that the cage is a second distance from the upper frame that can be less than the first distance when the fluid tank is not positioned in the fluid tank receptacle.
  • Another illustrative embodiment of the present disclosure can include an upper frame with an upper frame base supporting a deck with a seat section having stationary side portions coupled to the upper frame base and movable middle portions positioned between the stationary side portions that can be configured to cooperate with a head deck section and a foot deck section to move the upper frame between a substantially horizontal position and a chair position.
  • Fig. ID is a perspective side view of a person-support apparatus according to one illustrative embodiment with the upper frame in a substantially horizontal orientation and including a fluid tank receptacle.
  • Fig. 2D is a perspective side view of a person-support apparatus according to one illustrative embodiment with the upper frame in a chair position.
  • Fig. 3D is a perspective side view of the fluid tank receptacle of Fig. ID.
  • Fig. 4D is a cross-sectional side view of the .fluid tank receptacle of Fig. ID showing the cage in a use position.
  • Fig. 5D is a perspective side view of the fluid tank receptacle of Fig. ID showing a fluid tank received in the fluid tank receptacle.
  • Fig. 6D is a perspective side view of the fluid tank receptacle of Fig. ID showing the accessory pole receptacle and transport handle.
  • Fig. 7D is a perspective side view of the fluid tank receptacle of Fig. ID showing the cage in the use position.
  • Fig. 8D is a perspective side view of the fluid tank receptacle of Fig. ID showing the cage in the use position.
  • Fig. 9D is a perspective top view of the fluid tank receptacle of Fig. ID.
  • Fig. 10D is a perspective bottom view of the fluid tank receptacle of Fig. ID
  • Fig. 1 ID is a partial cross-sectional view of the fluid tank receptacle of Fig. ID showing the spring located in the slots in the housing at a first length when the cage is in a storage position.
  • Fig. 12D is a partial cross-sectional view of the fluid tank receptacle of Fig. ID showing the spring located in the slots in the housing at a second length as the cage moves toward the use position.
  • Fig. 13D is a partial cross-sectional view of the fluid tank receptacle of Fig. ID showing the spring located in the slots in the housing at a third length when the cage is in the use position.
  • Fig. 14D is a perspective top view of the deck of Fig. ID showing the first and second movable portions and first and second stationary portions.
  • Fig. 15D is a perspective side view of the deck of Fig. ID showing the first and second movable portions in a first orientation with respect to the upper frame as the person- support apparatus moves to a chair position.
  • Fig. 16D is a perspective end view of the deck of Fig. ID showing the first and second movable portions in a first orientation with respect to the upper frame as the person- support apparatus moves to a chair position.
  • One illustrative embodiment of the present disclosure can include fluid tank storage assembly with cage configured to extend from the upper frame a first distance when a fluid tank is stored in the fluid tank storage assembly and retract toward the upper frame such that the cage is a second distance from the upper frame that can be less than the first distance when the fluid tank is not stored in the fluid tank storage assembly.
  • Another illustrative embodiment of the present disclosure can include an upper frame with an upper frame base supporting a deck with a seat section having stationary side portions coupled to the upper frame base and movable middle portions positioned between the stationary side portions that can be configured to cooperate with a head deck section and a foot deck section to move the upper frame between a substantially horizontal position and a chair position.
  • a person-support apparatus 10 according to one illustrative embodiment of the current disclosure is shown in Figs. 1D-16D.
  • the person- support apparatus 10 can be a hospital bed with a first section Fl or head support section Fl, where the head of a person (not shown) can be positioned and a second section S 1 or a foot support section S 1 , where the feet of the person (not shown) can be positioned.
  • the person-support apparatus 10 can also be a hospital stretcher or an operating table.
  • the person-support apparatus 10 can define a first longitudinal axis XI passing through the first section Fl and the second section SI and a transverse axis Yl substantially perpendicular to the first longitudinal axis.
  • the person-support apparatus 10 can include a lower frame 12 or base 12, a plurality of supports 14 coupled with the lower frame 12 and an upper frame 16 movably supported by the plurality of supports 14 above the lower frame 12. It should be appreciated that the supports 14 can be lift mechanisms 14 that can move the upper frame 16 with respect to the lower frame 12. It should also be appreciated that in one illustrative embodiment, the person- support apparatus 10 can support a person- support surface 18 on the upper frame 16.
  • the upper frame 16 can include an upper frame base 20, a deck 22, siderails 24, endboards 26, and an accessory support 28 as shown in Figs. 1D-2D, 5D-8D, and 14D-16D.
  • the upper frame base 20 can be coupled with the supports 14 and can support the deck 22 thereon as shown in Figs. ID and 2D.
  • the accessory support 28 can be located at a head end 30 of the upper frame 16. It should be appreciated that the accessory support 28 can be located at a foot end 32 of the upper frame 16.
  • the accessory support 28 can include transport handles 34, accessory pole receptacles 36, and fluid tank receptacles 38 as shown in Figs. 1D-13D.
  • accessory poles 40 such as, for example, IV poles and/or line management devices
  • the transport handles 34 can be configured to be gripped by a person and pushed to move the person- support apparatus 10 from one location to another.
  • the accessory pole receptacles 36 can be configured to removably retain accessory poles, such as, IV poles and/or line management equipment.
  • the transport handles 34 can include a curved portion 44 that can be configured to at least partially surround a portion of an accessory pole 40 received in the accessory pole receptacles 36.
  • the fluid tank receptacle 38 can include a receptacle body 46 with an opening 48 therethrough, a bumper 50, a retainer 52, and a cage 54 as shown in Figs. 1D-13D.
  • the opening 50 can be sized to receive a fluid tank 56, such as, for example, an oxygen tank, therein.
  • the retainer 52 can be secured to the receptacle body 46 and can be configured to couple the cage 54 to the receptacle body 46 and movably couple the bumper 50 to the receptacle body 46.
  • the retainer 52 can include a plurality of holes 58 that can be configured to receive a portion of the cage 54 and fasteners used to secure the retainer 52 to the receptacle body 46.
  • the bumper 50 can be configured to absorb some of the force generated when the bumper 50 collides with an object, such as, for example, a wall.
  • the bumper 50 can be positioned between the receptacle body 46 and the retainer 52 as shown in Figs. 1D-13D.
  • the bumper 50 can be configured to rotate about a rotational axis Rl passing through the center of the opening 48. It should be appreciated that the ability of the bumper 50 to rotate can help reduce the force generated when the bumper 50 indirectly collides with an object, such as, a wall.
  • the cage 54 can be movably coupled to the receptacle body 46 and can be configured to move between a use position where the cage 54 supports a fluid tank 56 received within the fluid tank receptacle 38, and a storage position.
  • the cage 54 can include a plurality of cage supports 60, a support coupler 62, and a plurality of springs 64.
  • the cage supports 60 can include a first support end 66 and a second support end 68.
  • the first support end 66 can be configured to pass through one of the holes 58 in the retainer 52 to slidably engage one of the cage support slots 70 in the receptacle body 46.
  • the second end 68 can be configured to be coupled to the support coupler 62.
  • the cage supports 60 can be U- shaped and the second end 68 can pass through another of the holes 58 to engage another of the cage support slots 70.
  • the first support end 66 can include a retaining ring 72 coupled thereto and configured to cooperate with the spring 64 and/or the retainer 52 to maintain the first support end 66 within the cage support slot 70.
  • the spring 64 can be located in the cage support slot 70 and can be configured to bias the cage 54 toward the storage position.
  • the spring 64 can be positioned between the retaining ring 72 and the retainer 52 as shown in Figs. 11D-13D.
  • the spring 64 can be a first length when the cage 54 is in the storage position as shown in Fig. 14D and can be compressed to a second length when a fluid tank 56 engages the cage 54 and moves the cage 54 to the use position as shown in Fig. 16D. It should be appreciated that the weight of the fluid tank 56 can cause the spring 64 to compress. When the fluid tank 56 is removed, the spring 64 can bias the cage 54 toward the storage position.
  • the deck 22 can include a head portion 74, a seat portion 76, and a foot portion
  • the head portion 74, the seat portion 76, and the foot portion 78 can be movably coupled with each other and/or the upper frame base 20 and can be configured to cooperate with one another to move the deck 22 between a relatively horizontal position and a chair position as shown in Figs. 2D and 16D.
  • the seat portion 76 can include first and second outer portions 80 and 82 and first and second inner portions 84 and 86.
  • the first and second inner portions 84 and 86 can be positioned between the first and second outer portions 80 and 82.
  • the first and second inner portions 84 and 86 can be movable with respect to the upper frame base 20.
  • the first inner portion 84 can be movably coupled to the second inner portion 84 at a first joint 88 and the second inner portion can be coupled to the foot portion 78 at a second joint 90.
  • the first and second outer portions 80 and 82 can be stationary with respect to the upper frame base 20. It should be appreciated that the first and second outer portions 80 and 82 can help reduce incidents of pinch points and maintain the spacing between the deck 22 and the siderails 24 as the first and second inner portions 84 and 86 move with respect to the upper frame base 20.
  • a person-support apparatus comprises a lower frame, an upper frame, and a deck.
  • the upper frame is movably supported above the lower frame by a support.
  • the deck is supported on the upper frame, the deck includes a section with a first portion configured to be movable with respect to the upper frame and a second portion configured to be stationary with respect to the upper frame.
  • the person- support apparatus is configured to be movable between a generally horizontal position and a chair position.
  • a fluid tank receptacle comprises a housing, a cage, and a retainer.
  • the housing includes an opening therethrough configured to receive a fluid tank.
  • the cage movably engages the housing and configured to support the fluid tank.
  • the retainer is coupled to the housing and is configured to movably retain a portion of the cage within the housing such that the cage is able to move between a storage position and a use position with respect to the housing.
  • the subject matter described herein relates to siderails of the type used on hospital beds and particularly to a siderail having a variable height that enables the siderail to comply with potentially conflicting design requirements.
  • Beds of the type used in hospitals, other health care facilities and home health care settings include a frame, a deck, a mattress resting on the deck and a set of siderails.
  • the siderails have a deployed or raised position and a lowered or stored position. In the deployed position the top of the siderail should be a minimum distance above the top of the deck, and the bottom of the siderail should be low enough, and close enough to the neighboring lateral side of the deck, to ensure that any gap between the siderail and the deck is less than a specified amount, for example 60 mm.
  • the top of the siderail In the stowed position, the top of the siderail should be a minimum distance below the top of the mattress to facilitate occupant ingress and egress, and the distance from the bottom of the siderail to the floor should be no less than a prescribed amount, for example 120 mm.
  • a siderail tall enough to satisfy the requirements of the deployed state may be too tall to satisfy one or both of the requirements of the stored state.
  • a siderail short enough to satisfy the requirements of the stored state may be too short to satisfy one or both of the requirements of the deployed state.
  • Siderails should also be designed to minimize "pinch points", i.e. spaces large enough to receive a foreign object when the siderail is in one position, but which become small enough to trap the object when the siderail is placed in a different position.
  • a siderail comprises a rail having a lower edge extending longitudinally from a head end to a foot end, and a longitudinally outer link comprising a head side outer link segment and a foot side outer link segment. Each segment is connected to the rail at a joint OR and connected to a host frame at a joint OF.
  • the siderial also includes an inner link
  • the head side outer link segment extends longitudinally from approximately the head end of the rail lower edge toward the inner link without longitudinally overlapping the inner link.
  • the foot side outer link segment extends longitudinally from approximately the foot end of the rail lower edge toward the inner link without longitudinally overlapping the inner link.
  • FIG. IE is a right side elevation view of a hospital bed having variable height siderails as described herein.
  • FIG. 2E is a plan view of the bed of FIG. IE.
  • FIG. 3E is a perspective view of the right side, head end siderail of FIG. IE in a raised or deployed state as seen from the non-occupant side of the siderail.
  • FIG. 4E is a view similar to that of FIG. 3E with the siderail in a lowered or stored state.
  • FIG. 5E is a side elevation view of the left side head end siderail as seen from the occupant side of the siderail.
  • FIG. 6E is an exploded, perspective view of the siderail of FIG. 6E as seen from the occupant side of the siderail.
  • FIGS. 7E-10E are a sequence of perspective views of the siderail of FIG. 5E as seen from the occupant side of the siderail showing the siderail in a deployed position, a partially lowered position, a more lowered position, and a stored position respectively.
  • FIG. 1 IE is a view similar to that of FIG. 3E showing a variable height siderail in which an outer link portion thereof is constructed of two pieces, the siderail being shown in a deployed position.
  • FIG. 12E is a view similar of the siderail of FIG. 1 IE showing the siderail in a stored position.
  • FIG. 13E is a view similar to that of FIG. IE showing other embodiments of the variable height siderail.
  • FIG. 14E is a perspective view of the head end siderail of FIG. 13E. DETAILED DESCRIPTION
  • a hospital bed 10 having a longitudinally extending centerline 20 extends longitudinally from a head end 12 to a foot end 14 and laterally from a left side 16 to a right side 18.
  • the bed includes a base frame 26 and an elevatable frame 28 mounted on the base frame by interframe links 30.
  • the elevatable frame includes a deck 32.
  • a mattress 34 rests on the deck. Casters 38 extend from the base frame to the floor 40.
  • the bed also includes left and right head end siderails 50, 52 and left and right foot end siderails 54, 56.
  • the head end siderails are substantially mirror images of each other.
  • the foot end siderails are substantially mirror images of each other.
  • Each head end siderail differs from its neighboring foot end siderail, however the differences do not extend to the variable height attribute described herein. Accordingly it will suffice to describe only one siderail in detail.
  • right side head end siderail 52 includes a rail 70 having a lower edge 72 extending longitudinally from a rail head end 74 to a rail foot end 76, thereby defining the longitudinal extent L of the lower edge.
  • a longitudinally outer link 80 comprises a head side outer link segment 82 and a foot side outer link segment 84. Each outer link segment is connected to the rail at joints OR and to the host frame 28 at joints OF.
  • An inner link 110 having a laterally outer side 112, a laterally inner side 114, a head side edge 116 and a foot side edge 118 resides longitudinally intermediate the outer link segments 82, 84.
  • the inner link is connected to rail 70 at a joint IR and to host frame 28 at a joint IF.
  • joints IR, OR, IF, and OF define pivot axes IRx, ORx, IF X , OF x that extend parallel to centerline 20.
  • Joints IR and OR are laterally displaceable relative to the frame such that rail 70, outer link 80, inner link 110 and frame 28 comprise a four bar linkage enabling movement of the rail between a deployed or raised position (FIGS. 3E, 5E, 7E-9E) and a stored or lowered position(FIGS. 4E, 10E). The progression from the deployed position to the stowed position is seen best in the sequence of views of FIGS. 7E-10E.
  • Each outer link segment 82, 84 has a frame end 88, a rail end 90 and an elbow portion 92 extending between the frame and rail ends.
  • the frame end 88 of each segment is connected to frame 28 at joints OF.
  • the frame end 88 of each outer link segment has a longitudinally inboard edge 96 and a longitudinally outboard edge 98, the longitudinally inboard edge 96 being longitudinally closer to inner link 1 10, and the longitudinally outboard 98 edge being longitudinally further away from the inner link.
  • the rail end 90 of each outer link segment extends from joint OR in a direction nonparallel to that of the frame end 88. For example, when the siderail is in the deployed state as seen in FIG. 7E, the frame end 88 of each outer link segment is oriented approximately horizontally while the rail end 90 is oriented substantially vertically.
  • the rail end of each outer link segment includes a wing portion 94 having a top edge 106.
  • the rail ends 90 of the outer link segments extend longitudinally toward the inner link, but not far enough to overlap the inner link, even partially.
  • the rail end of the head side outer link segment 82 extends longitudinally from approximately the head end 74 of the rail lower edge, toward the inner link, and terminates at a terminus 100 longitudinally outboard of the inner link.
  • the rail end of the foot side outer link segment 84 extends longitudinally from approximately the foot end 76 of the rail lower edge toward the inner link, and terminates at a terminus 102 also longitudinally outboard of the inner link.
  • terminus 100 of the head side outer link segment 82 would be no further inboard than the head side edge 116 of inner link 110, and terminus 102 of the foot side outer link segment 84 would be no further inboard than the foot side edge 118 of inner link 110.
  • each outer link segment 82, 84 in addition to being connected to rail 70 at a joint OR, is also connected to rail 70 at a joint P near the longitudinal ends 74, 76 of the rail.
  • Joint P is a joint between the rail 70 and the wing portion 94 of rail end 90 of each link segment.
  • Joint P defines a pivot axis ⁇ which is common with pivot axis ORx of joint OR.
  • Rail end 90 of each outer link segment has a top edge 106 spaced from rail lower edge 72 along substantially all of the longitudinal extent of the rail end of the outer link thereby defining interedge space 130.
  • inter-edge space 130 addresses a pinch risk that would be formed by edges 72, 106 if they were separated by a smaller distance.
  • any pinch risk is limited to the regions 132 where the wing portions 94 are in close proximity to the rail in order to be connected thereto at joint P.
  • the space also facilitates cleaning.
  • a larger space 130 will be more advantageous for limiting pinch risk and facilitating cleaning; a smaller space will be less advantageous.
  • the size of space 130 may be determined by the siderail designer or prescribed by regulation or voluntary standards. As is evident from FIGS. 7E-10E, adequate inter-edge spacing is maintained throughout the range of travel of the rail from deployed to stored.
  • each outer link In the deployed state (e.g. FIG. 7E) the rail end of each outer link, including wing portion 94, extends substantially vertically relative to the rail. Consequently the siderail 52 has an effective height hup defined by a height hi of the rail and a height h 2 of the rail end of the outer link segments.
  • the siderail As the siderail is lowered (FIGS. 8E, 9E) to a fully stored state (FIG. 10E or FIG. 4E) the rail end of each outer link panel, including wing porton 94, folds up laterally inwardly of the rail (i.e. behind the rail). Consequently, the siderail, when in the stored state, has an effective height IIDOWN which is less than hup.
  • no part of the outer link segments 82, 84 projects vertically below lower edge 72 of the rail when the siderail is in the stored state. Accordingly, the outer link segments make no contribution to the height h D owN.
  • the smaller effective height h D owN provides additional latitude for a bed occupant to position his heels under his center of gravity, which is desirable when a bed occupant is moving out of or into the bed by way of a sitting position with his or her legs draped over the side of the bed.
  • the smaller effective height also offers an improved line of sight and access to foot pedal controls, such as foot pedals 42 (FIG. IE).
  • each outer link segment is illustrated as a one piece structure.
  • each outer link segment would be a two piece structure.
  • the two piece structure comprises an arm 140 extending between joints OF and OR and a separately manufactured panel 94', analogous to wing portion 94 of the single piece construction, affixed to arm 140 by fasteners 142.
  • Such a construction allows the designer to specify the use of different materials best suited for the demands placed on the arm and panel portions of the outer link segments.
  • a siderail 52' comprises a rail 70' having an upper panel 70 and a lower panel 94'.
  • the upper panel lower edge 72 extends longitudinally from upper panel head end 74 to upper panel foot end 76.
  • the siderail also includes longitudinally outer link 80 comprising head side outer link segment 82 and foot side outer link segment 84.
  • Each outer link segment comprises the arm 140 comprising frame end, rail end and elbow portions 88, 90, 92 respectively, and the separately manufactured panel 94' affixed to its rail end by fasteners 142.
  • the siderail also includes inner link 1 10 longitudinally intermediate the outer link segments. The inner link is connected to the upper panel 70 at joint IR and to the host frame 78 at joint IF.
  • the rail lower panel 94 comprises head side and foot side subpanels 94 ⁇ , 94'F, each of which is connected to one of the outer link segments by the fasteners 142 so that the subpanels, and therefore the lower panel 94' as a whole, are stationary with respect to the outer link 80.
  • the lower panel extends longitudinally from substantially the head end 74 to the foot end 76 of the upper panel lower edge 72 without longitudinally overlapping or crossing over the laterally outer side 1 12 of the inner link.
  • the illustrated lower panel avoids crossing over the inner link by virtue of the twin panel construction in which subpanel 94 ⁇ extends
  • subpanel 94'F extends longitudinally headwardly toward the inner link but has a terminus 102 longitudinally outboard of inner link foot side edge 1 18.
  • each subpanel 94 ⁇ , 94'F in addition to being connected to one of the arms 140, may also be pivotably connected to upper panel 70 at joint P.
  • Top edge 106 of each subpanel is spaced from upper panel lower edge 72 along substantially all of the longitudinal extent of the lower panel thereby defining the interedge space 130.
  • the subpanels 94 ⁇ , 94'F extend substantially vertically relative to the upper panel 70. Consequently the siderail 52' has an effective height hup defined by a height hi of the upper panel and a height h 2 of the lower panel.
  • the siderail As the siderail is lowered to a fully stored state (FIG. 12E) the subpanels fold up laterally inwardly of the upper panel (i.e. behind the upper panel). Consequently, the siderail, when in the stored state, has an effective height II DOWN which is less than hup. In the illustrated embodiment, no part of the lower panel projects vertically below lower edge 72 of the upper panel when the siderail is in the stored state.
  • the lower panel makes no contribution to the height hoow -
  • FIGS. 13E- 14E show a bed with siderails whose physical configuration differs from that of the siderails shown in FIGS. 1E- 12E.
  • the space 130 between the wing portion of the outer link segments and the rail is smaller than the space 130 of FIGS. 1E-12E.
  • the differences in appearance do not affect the variable height attribute already described herein.

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  • Health & Medical Sciences (AREA)
  • Nursing (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Invalid Beds And Related Equipment (AREA)
  • Devices For Medical Bathing And Washing (AREA)
  • Floor Finish (AREA)

Abstract

La présente demande de brevet internationale PCT combine cinq demandes américaines séparées en une seule demande constituée des parties A-E. La partie A se rapporte à une structure de lit ayant un convertisseur de mouvement de section de plate-forme. La partie B se rapporte à un procédé et à un système de commande des performances d'évaporation et d'extraction de chaleur d'une surface de support d'occupant. La partie C se rapporte à un capteur de lit ci-dessus. La partie D se rapporte à un appareil de support de personne. La partie E se rapporte à un côté de lit à hauteur variable.
PCT/US2011/043392 2010-07-09 2011-07-08 Systèmes, dispositifs et procédés de support de personne WO2012006545A2 (fr)

Priority Applications (8)

Application Number Priority Date Filing Date Title
JP2013518864A JP5986077B2 (ja) 2010-07-09 2011-07-08 使用者保持システム、装置、および方法
AU2011274503A AU2011274503A1 (en) 2010-07-09 2011-07-08 Person support systems, devices, and methods
EP11804417.1A EP2590610B1 (fr) 2010-07-09 2011-07-08 Systèmes, dispositifs et procédés de support de personne
EP17164865.2A EP3210586B1 (fr) 2010-07-09 2011-07-08 Dispositif de fixation pour un réservoir de fluide sur des systèmes de support de patient
US13/733,962 US8713728B2 (en) 2010-07-30 2013-01-04 Medical gas tank holder for patient support apparatus
US13/733,980 US8646131B2 (en) 2010-07-30 2013-01-04 Variable height siderail
US14/176,188 US9060619B2 (en) 2010-07-09 2014-02-10 Variable height siderail
US14/269,492 US9333134B2 (en) 2010-07-09 2014-05-05 Medical gas tank receptacle for patient support apparatus

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
US12/833,321 2010-07-09
US12/833,321 US8516634B2 (en) 2010-07-09 2010-07-09 Bed structure with a deck section motion converter
US12/836,606 US9222685B2 (en) 2010-07-15 2010-07-15 Method and system for controlling evaporative and heat withdrawal performance of an occupant support surface
US12/836,606 2010-07-15
US36949910P 2010-07-30 2010-07-30
US36915210P 2010-07-30 2010-07-30
US12/847,337 2010-07-30
US12/847,337 US8620625B2 (en) 2010-07-30 2010-07-30 Above bed sensor
US61/369,152 2010-07-30
US61/369,499 2010-07-30

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US13/733,980 Continuation US8646131B2 (en) 2010-07-09 2013-01-04 Variable height siderail
US13/733,962 Continuation US8713728B2 (en) 2010-07-09 2013-01-04 Medical gas tank holder for patient support apparatus

Publications (3)

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WO2012006545A2 true WO2012006545A2 (fr) 2012-01-12
WO2012006545A9 WO2012006545A9 (fr) 2013-04-18
WO2012006545A3 WO2012006545A3 (fr) 2013-06-06

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EP (2) EP2590610B1 (fr)
JP (2) JP5986077B2 (fr)
AU (1) AU2011274503A1 (fr)
WO (1) WO2012006545A2 (fr)

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Publication number Publication date
EP3210586B1 (fr) 2019-08-28
EP2590610A4 (fr) 2015-06-03
JP2015211871A (ja) 2015-11-26
JP2013533041A (ja) 2013-08-22
EP3210586A1 (fr) 2017-08-30
WO2012006545A9 (fr) 2013-04-18
WO2012006545A3 (fr) 2013-06-06
AU2011274503A1 (en) 2013-01-31
EP2590610A2 (fr) 2013-05-15
EP2590610B1 (fr) 2017-05-17
JP5986077B2 (ja) 2016-09-06

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