# Patent

## Title
Bed status indicators

## Abstract

A bed includes bed status indicators, such as a pair of spaced lamp modules that are illuminated to signify a satisfactory status or an unsatisfactory status of the bed.

## Background
The present application is a continuation of U.S. application Ser. No. 12/233,982 which was filed Sep. 19, 2008 and which is hereby incorporated by reference herein.


TECHNICAL FIELD
The subject matter described herein relates to methods and systems for reporting the status of a bed, such as a hospital bed.
BACKGROUND
Non-residential beds are used in hospitals, private residences and other facilities. These beds include special features such as brakes, head end and foot end siderails and adjustable elevation. The occupant of these types of beds is typically a patient who may be vulnerable to adverse events such as falls. Safeguards can be used to help mitigate the risk to the vulnerable patient. For example, a patient vulnerable to falling can be better protected if the brakes on the bed are set, the bed is at its lowest elevation and at least the head end siderails are deployed. It is desirable to indicate whether or not such safeguards are in place either to convey confidence that the bed is in the desired state or to provoke corrective action if the bed is not in the desired state. The present application discloses a method and system for making such indications.
SUMMARY
A method for reporting the status of a bed whose occupant is at risk of an undesired event includes indicating that the occupant is at risk of the undesired event and operating a lamp module to signify a satisfactory status or an unsatisfactory status of the bed in response to the risk indication and an indication of whether or not a risk related safeguard is in effect.
The foregoing and other features of the various embodiments of the method and associated systems will become more apparent from the following detailed description and the accompanying drawings.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a hospital bed.
FIG. 2 is an enlarged view of a portion of the bed of FIG. 1.
FIG. 3 is a schematic, side elevation view of the bed.
FIG. 4 is a block diagram showing decisions leading to operation of a lamp module in either a first or second manner depending on the state of the bed.
FIG. 5 is a view similar to that of FIG. 4 showing operation of one or the other of two dedicated lamp modules depending on the state of the bed.
FIG. 6 is a schematic view showing certain components of a physical system for reporting the status of the bed.
FIG. 7 is a view similar to that of FIG. 4 showing a method and system that uses an auxiliary condition for assessing the status of the bed.
FIG. 8 is a view similar to that of FIG. 5 showing a method and system that uses an auxiliary condition for assessing the status of the bed.
FIG. 9 is a view showing a generic version of the method and system of FIG. 4.
FIG. 10 is a view showing a generic version of the method and system of FIG. 7.
FIG. 11 is a schematic view of components of a retrofit kit for incorporating the reporting capability disclosed herein in a pre-existing bed.



DETAILED DESCRIPTION
Referring to FIGS. 1 and 2, a bed 12 of the type used for hospital patients includes a base frame 14, a height adjustable frame 16 and a set of links 18, which are part of a system for adjusting the height adjustable frame between lowest and highest elevations. The base frame includes wheels 20 and a brake system controlled by foot pedals 22 for preventing rotation of at least one of the wheels about its rotational axis 24. A variety of brake systems and a variety of height adjustment systems are satisfactory for use with the methods and systems disclosed herein.
The bed also includes a mattress 30 atop the adjustable frame, a headboard 32, and a footboard 34. The adjustable frame supports a set of laterally spaced apart head end siderails 36 and a set of laterally spaced apart foot end siderails 38. The siderails may be deployed, as shown in the illustration, or may be retracted to a lower position or removed to facilitate ingress or egress of a bed occupant or to provide easy access to the occupant by a caregiver. As shown in schematically in FIG. 3, the head end of the bed maybe pivotable such that it can be oriented at a Head of Bed (HOB) angle α.
At least one lamp module 42 is also secured to the height adjustable frame by left and right brackets 43 having shield portions 45. As seen in FIGS. 2 and 6, an exemplary lamp module comprises two arrays 44, 46 of light emitters such as light emitting diodes (LED's) 48, 50 housed behind a translucent or transparent protective lens 54. The lamp module is positioned and oriented relative to the frame and brackets so that light emitted from the module is directed predominantly or at least partially toward the floor. This helps reduce annoyance to occupants of nearby beds when the light is on. However, because the light shines toward the floor, the illumination of the floor and any reflection off the floor will help capture the attention of a caregiver in the vicinity. The shield portions 45 of the bracket shield the lamp module from damage and help intercept light emission in directions that would annoy occupants of nearby beds. The LED arrays emit light having different properties. For example, the LED's 48 of array 44 emit visible green light and the LED's 50 of array 46 emit visible amber light. Either or both arrays may be controlled to produce steady or intermittent (non-steady) light emission. As seen best in FIG. 6, the arrays are arranged so that their individual members alternate.
The bed also includes a Patient Position Monitoring (PPM) system shown schematically as 60. The PPM system has an armed state which is used when it is desired to monitor the position and/or activity of the bed occupant. For example, the PPM system may be armed when the occupant is judged to have an unacceptably high risk of falling or when the occupant is not authorized to exit from the bed without assistance. A typical armed PPM system has three sensitivity levels, one to annunciate an alert when the occupant has moved, one to annunciate an alert if the occupant has moved in a way that suggests an intent to exit the bed and one to annunciate an alert if the occupant has exited the bed.
For an occupant judged to be a fall risk, the states of the brake, the height adjustable frame 16, and the head end siderails 36 may be designated as states or conditions of the bed related to the fall risk. Individually, these states or conditions are input conditions that determine whether or not a safeguard related to the risk is in effect. Collectively, these states define a safeguard related to fall risk. The safeguard can be in effect or not depending on whether or not the associated input conditions are satisfied. For example, the brake being set, the height adjustable frame being at its lowest position and the head end siderails being deployed are relatively safe states of the brake, height adjustable frame and head end siderails respectively for an occupant judged to be a fall risk. By contrast, the brake being released, the height adjustable frame being higher than its lowest position and the head end siderails being retracted or removed are relatively less safe states for that occupant. Preferably, all of the desired conditions must be satisfied (brake set, height adjustable frame at its lowest position, both head end siderails deployed) to declare that the safeguard is in effect. If even one of the desired input conditions is not satisfied, the safeguard is not in effect. Alternatively, the safeguard may be declared to be in effect if even one of the desired conditions is present. Only if all the desired conditions are absent is the safeguard is considered to not be in effect.
The above described condition relating to deployment of the siderails is configurable by the user. Specifically, the user can specify that all four siderails must be deployed or that both head end siderails and either foot end siderail must be deployed in order for the siderails to be considered to be in a desired state. Other variations on the individual condition or conditions and other combinations of conditions fall within the scope of the subject matter claimed herein.
Referring to FIG. 4, a method of reporting the status of a bed for an occupant at risk of falling includes determining if the PPM system is armed. If so, and if a fall risk safeguard is in effect, a lamp module 42 (FIGS. 1 and 2) is operated in a first manner to signify that the bed status is satisfactory. However if the PPM system is armed and a fall risk safeguard is not in effect, the lamp module 42 is operated in a second manner to signify that the bed status is unsatisfactory. If the PPM is not armed, the method refrains from operating the lamp module. The same lamp module is used to signify both the satisfactory bed status and the unsatisfactory bed status. As a result, the module is operated in a different manner depending on which status is to be signified. Preferably, the module emits green light to signify the satisfactory status and amber light to signify the unsatisfactory status. The light emission may be steady or intermittent or may be steady for one status and intermittent for the other. Preferably, the light emission corresponding to the satisfactory bed status is steady; the light emission corresponding to the unsatisfactory status is intermittent. The use of the same lamp module for both the satisfactory status indication and the unsatisfactory indication does not preclude the use of multiple such modules distributed about the bed as seen in FIG. 1. Alternatively, as suggested in FIG. 5, the lamp module operated to signify the satisfactory status and the lamp module operated to signify the unsatisfactory status may be different, mutually exclusive modules, one dedicated to the satisfactory status and one dedicated to the unsatisfactory status, with neither module being operated if the PPM system is disarmed. Because the dedicated modules are mutually exclusive, they can both be operated in the same manner (e.g. both emitting the same color light, at the same intensity and with the same degree of intermittency, including steady emission) or they may be operated in different manners as described above for the nondedicated lamp module. In addition, multiple sets of the dedicated modules may be deployed about the bed.
Referring to FIG. 6, certain components of a physical system related to the status reporting method includes the PPM system 60, at least one lamp module 42, an integrated circuit chip 64 containing lamp logic 62, and a printed circuit board (PCB) 66. The chip includes logic related to a number of functions of the bed including the logic 62 for determining whether the lamp module should indicate a satisfactory or unsatisfactory bed status. The PCB is in communication with the chip and, based on the determination from the logic 62, operates the lamp module to make the required indication. Collectively, the chip and PCB define a means 68 for conditionally governing operation of the lamp module based on inputs from the PPM system (armed or disarmed) and a determination of whether or not a safeguard is in effect as described above. The means 68 produces a SATISFACTORY message or signal to operate the lamp module in a first manner if the PPM is in its armed state and the safeguard is in effect. The means 68 produces an UNSATISFACTORY message or signal to operate the lamp module in a second manner if the PPM is in its armed state and the safeguard is not in effect. Depending on the results (SATISFACTORY OR UNSATISFACTORY) the lamp module is commanded to operate in a first manner to signify a satisfactory status of the bed or in a second manner to signify an unsatisfactory status of the bed. As illustrated, the lamp module operated in the first manner and the lamp module operated in the second manner are the same lamp module. The first manner of operation comprises operating the green LED's, 48 either steadily or intermittently but preferably steadily. The second manner of operation comprises operating the amber LED's 50 either steadily or intermittently, but preferably intermittently. However, in accordance with the method described above in the context of FIG. 5, the system could instead use different lamp modules, one dedicated to the satisfactory bed status and the other dedicated to the unsatisfactory bed status.
If the PPM is not armed, the occupant has not been identified as having an unacceptable risk of falling. Accordingly, the lamp module is operated in a third manner. Specifically, the method and system refrain from issuing a message or signal to operate the lamp module (or modules), resulting in non-emission of visible light from the lamp module. The non-issuance of a signal or message may be viewed as the issuance of a NULL message.
In some situations, the above described system and method may used on a bed already having other systems for alerting, alarming or otherwise indicating noncompliance with a desired state. One example of such an other system is a Head of Bed (HOB) alarm which sounds an audible alarm if the HOB alarm is armed and the Head of Bed angle α (FIG. 3) is determined to be less than 30 degrees. When the system disclosed above is used in conjunction with the other system, it is desirable for the above disclosed system to signal an unsatisfactory status under any conditions that cause or would cause the other system to issue an indication of noncompliance, even if the above disclosed system would otherwise indicate a satisfactory status.
FIG. 7 shows the combination of an auxiliary condition, such as whether or not the HOB angle is less than 30 degrees, with the method and system already described. As seen in the Figure, the method determines if the PPM is armed. If so, and if the safeguard is in effect (e.g. head end siderails deployed, height adjustable frame at its lowest position, brake set), the method determines if an auxiliary condition is acceptable (e.g. the HOB angle is at least 30 degrees). If the auxiliary condition is satisfied or acceptable (path A), the method operates a lamp module in the first manner to signify a satisfactory status of the bed. However if the auxiliary condition is not satisfied or unacceptable (path B), the method operates the lamp in the second manner to signify an unsatisfactory status of the bed. The system also operates the lamp in the second manner to indicate an unsatisfactory status if the PPM is armed and the safeguard is not in effect (path C) or if the auxiliary condition is unacceptable (i.e. the auxiliary condition isn't satisfied) even if the PPM system is not armed and irrespective of whether or not the safeguard is in effect (path D). The method indicates a NULL status if the PPM system is not armed and the state of the auxiliary condition is acceptable (path E).
FIG. 8 shows a method and system similar to that of FIG. 7, but using one lamp module dedicated to the satisfactory status and one dedicated to the unsatisfactory status.
FIGS. 9 and 10 show the method and the associated system generalized to risks of undesired events other than falls. The generalization involves indicating that the bed occupant is at risk of the undesired event (for example arming a PPM system indicates that the bed occupant has an unacceptably high risk of falls) and determining if a safeguard specific to the risk is in effect. Whether or not a particular, risk specific safeguard is in effect will be a function of one or more states or conditions related to the risk in question. Referring specifically to FIG. 9 and the table below, if the occupant is indicated as being at risk and the risk specific safeguard is in effect, an indication is provided to signify a satisfactory status of the bed. If the occupant is indicated as being at risk and the risk specific safeguard is not in effect, an indication is provided to signify an unsatisfactory status as set forth below:
















Is Event Specific





Safeguard
Bed Status



At Risk?
In Effect?
Indication









Yes
Yes
Satisfactory



Yes
No
Unsatisfactory










As seen in FIG. 10 and the table below, an auxiliary condition, such as the HOB angle, can also be accounted for.
















Is Event Specific



Auxiliary

Safeguard
Bed Status


Condition
At Risk?
In Effect?
Indication







Acceptable
Yes
Yes
Satisfactory


Acceptable
Yes
No
Unsatisfactory


Unacceptable


Unsatisfactory









The system and method as illustrated in FIGS. 9 and 10 suggest the use of the same lamp module for signifying both the satisfactory and unsatisfactory states, however dedicated lamp modules, as previously described, can be employed instead. Moreover, it will be appreciated that variations on the theme, such as but not limited to those previously described (property of light emission, dedicated vs. non-dedicated lamp modules, the use of single or multiple lamp modules, and the use of an auxiliary condition) can be employed or not at the discretion of the designer.
The disclosed system may be included in newly manufactured beds, allowing those beds to carry out the disclosed method. The system may also be retrofit into pre-existing beds to upgrade their capabilities. Accordingly, as seen in FIG. 11, a retrofit kit 70 includes at least one lamp module 42 configured to be responsive the SATISFACTORY message, the UNSATISFACTORY message and the NULL message, and left and right brackets 43 for securing the lamp modules to the height adjustable frame 16. The kit also includes chip 64, PCB 66, various fasteners such as bracket screws 72, magnets 74 and cable ties 76 for securing the brackets and wires to a bed. The kit also includes labels 80, instructions 82 and packaging components 84. The chip 64 is substitutable for a pre-existing chip on the bed that does not have the lamp operating logic 62. Similarly, the PCB is substitutable for a pre-existing PCB on the bed that is not capable of operating the lamp modules. The lamp operating logic 62 is capable of receiving a Patient Position Monitoring (PPM) message from a PPM system indicating whether the PPM system is armed or disarmed and is also capable of receiving state or condition information for revealing whether a risk specific safeguard is in effect. The logic 62 and PCB 64 are responsive to the PPM message and the state or condition information for producing a SATISFACTORY or UNSATISFACTORY message as set forth below:

















Bed Status



PPM
Safeguard
Indication









Armed
In Effect
Satisfactory



Armed
Not In Effect
Unsatisfactory.










The method may also be used in conjunction with other systems designed to indicate noncompliance with a requirement. The logic 62 and PCB 64 are responsive to the PPM message, the state or condition information, and the auxiliary condition for producing a SATISFACTORY or UNSATISFACTORY message as set forth below:
















Auxiliary


Bed Status



Condition
PPM
Safeguard
Indication









Acceptable
Armed
In Effect
Satisfactory



Acceptable
Armed
Not In Effect
Unsatisfactory



Unacceptable


Unsatisfactory










Although this disclosure refers to specific embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the subject matter set forth in the accompanying claims.

## Claims

1. A patient support apparatus comprising
a frame having a head end and a foot end,
a footboard coupled to the frame adjacent a foot end of the frame, and
a first lamp module and a second lamp module, the first and second lamp modules being coupled to the frame adjacent the foot end, the first lamp module being spaced apart from the second lamp module, at least a portion of the first and second lamp modules being lower in elevation than a bottom edge of the footboard so as to be observable below the footboard, the first and second lamp modules both being operated to emit light of a first color when a set of monitored bed status conditions are all in a satisfactory condition, the first and second lamp modules each being operated to emit light of a second color when at least one of the set of monitored bed status conditions is in an unsatisfactory condition.

2. The patient support apparatus of claim 1, wherein the first color is green and the second color is amber.

3. The patient support apparatus of claim 1, wherein the first and second lamp modules each include a first array of light emitting diodes (LED's) that are operable to emit the first color and a second array of LED's that are operable to emit the second color.

4. The patient support apparatus of claim 3, wherein LED's of the first and second arrays are arranged in a row such that the LED's of the first array alternate with the LED's of the second array.

5. The patient support apparatus of claim 3, wherein the first and second lamp modules each include a bracket that fastens to the frame.

6. The patient support apparatus of claim 5, wherein the first and second lamp modules each include a lens that is coupled to the bracket and behind which the first and second arrays of LED's are housed.

7. The patient support apparatus of claim 6, wherein the first and second brackets each include a shield portion that blocks a portion of the light emitted from the LED's of the first and second arrays.

8. The patient support apparatus of claim 1, wherein the light emitted from the first and second lamp modules is emitted predominantly downwardly.

9. The patient support apparatus of claim 1, wherein the set of monitored bed conditions all being in a satisfactory condition comprises 1) a caster brake being set, 2) an upper portion of the frame being at a lowered position relative to a base frame of the frame, and 3) a set of siderails all being in a raised position.

10. The patient support apparatus of claim 9, wherein the set of monitored bed conditions all being in a satisfactory condition further comprises a patient position monitoring system alert condition not being detected.

11. The patient support apparatus of claim 1, wherein the set of monitored bed conditions all being in a satisfactory condition comprises 1) a caster brake being set, 2) an upper portion of the frame being at a lowered position relative to a base frame of the frame, and 3) a pair of siderails being in a raised position.

12. The patient support apparatus of claim 11, wherein the set of monitored bed conditions all being in a satisfactory condition further comprises a patient position monitoring system alert condition not being detected.

13. The patient support apparatus of claim 1, wherein the set of monitored bed conditions all being in a satisfactory condition comprises any two or more of the following: 1) a caster brake being set, 2) an upper portion of the frame being at a lowered position relative to a base frame of the frame, 3) a set of siderails all being in a raised position, 4) a patient position monitoring system alert condition not being detected, and 5) an angle of a head section of the frame being above a threshold angle.

14. The patient support apparatus of claim 1, wherein the first and second lamp modules emit light of the first color substantially simultaneously and emit light of the second color substantially simultaneously.

15. The patient support apparatus of claim 1, wherein the first and second lamp modules are located substantially adjacent opposite sides of the frame.

16. A patient support apparatus comprising
a base frame,
an upper frame supported above the based frame, the upper frame having a head end and a foot end, and
a first lamp module and a second lamp module, the first and second lamp modules being coupled to the upper frame adjacent the foot end so as to extend downwardly from a bottom of the upper frame, the first lamp module being spaced apart from the second lamp module, the first and second lamp modules both being operated to emit light of a first color when a set of monitored bed status conditions are all in a satisfactory condition, the first and second lamp modules each being operated to emit light of a second color when at least one of the set of monitored bed status conditions is in an unsatisfactory condition.

17. The patient support apparatus of claim 16, wherein the light emitted from the first and second lamp modules is emitted predominantly downwardly.

18. The patient support apparatus of claim 16, further comprising a system for adjusting the height of the upper frame relative to the base frame, the first and second lamp modules moving with the upper frame as its height is adjusted relative to the base frame.

19. The patient support apparatus of claim 16, wherein the set of monitored bed conditions all being in a satisfactory condition comprises any two or more of the following: 1) a caster brake being set, 2) an upper portion of the frame being at a lowered position relative to a base frame of the frame, 3) a set of siderails all being in a raised position, 4) a patient position monitoring system alert condition not being detected, and 5) an angle of a head section of the frame being above a threshold angle.

20. The patient support apparatus of claim 19, wherein the two or more monitored bed conditions are able to be specified by a user.

21. The patient support apparatus of claim 16, wherein the first and second lamp modules emit light of the first color substantially simultaneously and emit light of the second color substantially simultaneously.

22. The patient support apparatus of claim 16, wherein the first and second lamp modules are located substantially adjacent opposite sides of the upper frame.

23. A patient support apparatus comprising
a frame having a head end and a foot end, the frame having casters,
a set of siderails coupled to the frame and each siderail of the set of siderails being independently movable between a raised position and a lowered position, and
a first lamp module and a second lamp module, the first and second lamp modules being coupled to the frame adjacent the foot end, the first and second lamp modules being spaced apart and located substantially adjacent opposite sides of the frame, the first and second lamp modules both being operated to emit light of a first color substantially simultaneously when a set of monitored bed status conditions are all in a satisfactory condition, the first and second lamp modules each being operated to emit light of a second color substantially simultaneously when at least one of the set of monitored bed status conditions is in an unsatisfactory condition, the first and second lamp modules having an exposed undersurface and emitting light of the first color and light of the second color substantially downwardly through the exposed undersurface.

24. The patient support apparatus of claim 23, wherein the set of monitored bed conditions all being in a satisfactory condition comprises any two or more of the following: 1) a caster brake being set to brake at least one of the casters, 2) an upper portion of the frame being at a lowered position relative to a base frame of the frame, 3) the set of siderails all being in a raised position, 4) a patient position monitoring system alert condition not being detected, and 5) an angle of a head section of the frame being above a threshold angle.