EP3694463A1

EP3694463A1 - Patient monitoring system and method thereof

Info

Publication number: EP3694463A1
Application number: EP18866646.5A
Authority: EP
Inventors: Viren Pramodray MISTRY; Ketan JAJAL; Dashmeet OBEROI; Dushyant ANANTHARAMAN; Abhishek KULKARNI; Saravana Nataraj; Venkateswaran Perumal
Original assignee: Stryker Global Technology Center Pvt Ltd
Current assignee: Stryker Global Technology Center Pvt Ltd
Priority date: 2017-10-10
Filing date: 2018-10-09
Publication date: 2020-08-19
Also published as: BR112020006270A2; EP3694463A4; WO2019073389A1; AU2018349285A1; JP2020536641A

Abstract

A patient monitoring system includes a patient support apparatus. The patient support apparatus includes an intermediate frame. The intermediate frame may include a plurality of planks with each plank having two face sheets and a core layer disposed between the two face sheets. Load cells are disposed within the core layer between the two face sheets and configured to generate signals responsive to load supported by the intermediate frame. A control module receives the signals from the load cells and generates signals to an output module such as a display to indicate to a caregiver a current load supported by the intermediate frame.

Description

PATIENT MONITORING SYSTEM AND METHOD THEREOF

TECHNICAL FIELD

[0001] The present disclosure relates, generally, to a patient monitoring system and method thereof.

BACKGROUND

[0002] Patient support apparatuses, such as hospital beds, stretchers, cots, tables, wheelchairs, and chairs facilitate care of patients. Patient monitoring systems are often outfitted with equipment to assist caregivers in monitoring real-time patient information while the patient is supported by the patient support apparatus. Real-time patient information received from the patient monitoring system can prove to be important to caregivers for fostering a comfortable environment for the patient. Acquisition of real-time patient information for some patients who have difficulty moving relative to the patient support apparatus e.g., patients who have a debilitating illness or injury, can be difficult.

[0003] Therefore, a patient monitoring system designed to address one or more of the aforementioned challenges is desired.

SUMMARY

[0004] The present disclosure provides a patient monitoring system. The patient monitoring system comprises a plurality of planks. A plurality of load cells are coupled to each plank. The plurality of load cells are configured to generate first input signals responsive to a load applied to each plank for measuring patient weight. One or more patient information sensors that are different from the plurality of load cells are configured to generate one or more second input signals responsive to one or more patient parameters different from patient weight. A control module is coupled to the plurality of load cells of each of the planks and the one or more patient information sensors. The control module is configured to receive the first input signals and the one or more second input signals and to generate one or more output signals responsive to the first and second input signals. An output module is coupled to the control module. The output module is configured to receive the one or more output signals from the control module. The output module is configured to indicate to a caregiver the patient weight and the one or more patient parameters different from patient weight.

BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 is a perspective view of a patient monitoring system comprising a patient support apparatus.

[0006] Figure 2 is a perspective view of the patient monitoring system with a mattress removed.

[0007] Figure 2B is a perspective view of another embodiment of the patient monitoring system with the mattress removed.

[0008] Figure 3 is a perspective view of an alternative mattress.

[0009] Figure 4 is a plan view of an intermediate frame of Figure 2 with face sheets removed.

[0010] Figure 5 is an exploded view of the planks of Figure 2 showing a first face sheet, a second face sheet, and a core layer disposed therebetween.

[0011] Figure 6A is a schematic view of a first supporting structure.

[0012] Figure 6B is a schematic view of a second supporting structure.

[0013] Figure 6C is a schematic view of a third supporting structure.

[0014] Figure 6D is a schematic view of a fourth supporting structure.

[0015] Figure 6E is a schematic view of a fifth supporting structure. [0016] Figure 7 A is an elevation view of a load being applied to the mattress supported on one embodiment of the supporting structure including vertical and angled ribs of a first pattern.

[0017] Figure 7B is an elevation view of a load being applied to the mattress supported on another embodiment of the supporting structure including vertical and angled ribs of a second pattern.

[0018] Figure 7C is an elevation view of a load being applied to the mattress supported on another embodiment of the supporting structure including vertical and angled ribs of a third pattern.

[0019] Figure 8 is a plan view of a plank of the intermediate frame with a face sheet removed.

[0020] Figure 9A illustrates one embodiment of a display of an output module showing a patient weight.

[0021] Figure 9B illustrates another embodiment of a display of the output module showing a position of the patient on the patient support apparatus.

[0022] Figure 9C illustrates another embodiment of a display of the output module showing a weight trend, a turn log, and a report.

[0023] Figure 10 is a flow chart of a method of operating the patient monitoring system.

[0024] Figure 11 is a perspective view of another embodiment of the patient monitoring system comprising a patient support apparatus having an intermediate frame with a removable X- ray cassette holder.

[0025] Figure 12 is a perspective sectional view of one embodiment of a plank.

[0026] Figure 13 is a perspective sectional view of another embodiment of a plank. DETAILED DESCRIPTION

[0027] With reference to the drawings, wherein like numerals are used to designate like features throughout the several views, a patient monitoring system 100 is shown in Figures 1 and 2. The patient monitoring system 100 collects, stores, monitors, and outputs information of the patient, using a centralized communication system. Detailed embodiments of the patient monitoring system 100 are disclosed herein. However, it is understood that the disclosed embodiments are merely exemplary. Therefore, the specific structural and functional details disclosed herein are not to be interpreted as limiting.

[0028] The patient monitoring system 100 comprises a patient support apparatus 10. The patient support apparatus 10 illustrated in the figures comprises a hospital bed. In other embodiments, however, the patient support apparatus 10 may comprise a cot, stretcher, table, wheelchair, chair, or similar apparatus utilized in the care of a patient. The patient support apparatus 10 generally includes a frame structure that comprises a patient support deck 12 and a base 14. In the illustrated embodiments, the base 14 includes a plurality of legs that extend downward to support the patient support deck 12.

[0029] The patient support apparatus 10 may comprise a headboard 18 adjacent a head end of the patient support apparatus 10. The patient support apparatus may further comprise a footboard 19 adjacent a foot end of the patient support apparatus 10. Side rails 21 may be located between the headboard 18 and footboard 19. The patient support apparatus 10 may comprise an elevation mechanism (not shown) and/or articulation mechanisms (not shown) configured to lift the patient support deck 12 and/or articulate one or more deck sections 12a, 12b, 12c, 12d of the patient support deck 12, thereby enabling articulation of one or more of the deck sections 12a, 12b, 12c, 12d of the patient support apparatus 10 into various configurations (e.g., positions and/or orientations). In general, the base 14 comprises a transport system including wheels 16 and a braking system (not shown) that allows for motion and maneuverability of the patient support apparatus 10.

[0030] In one embodiment, the system 100 provides a weight measuring module 101 that provides information related to weight when the patient is on the patient support apparatus 10. An electronic device 103, described further below, may be attached to the patient support apparatus 10, such as on the foot end of the patient support apparatus 10, to provide a reference/unique identifier/unique code associated with the patient support apparatus 10 and/or the patient for tracking patient weight. The weight measuring module 101 is attached to the patient support apparatus 10 and can communicate the patient weight information to a central information server 400 (see Figure 2) via either WiFi, Bluetooth, cellular or any other mode of communication, such as along a data network. The communicated information can be retrieved for that specific patient support apparatus 10/patient using the unique identifier on the patient support apparatus 10. The weight measuring module has the ability to read/identify any patient support apparatus 10 in the healthcare facility (e.g., hospital) using the reference/unique identifier/unique code present on the patient support apparatus 10 or using any other available signal from the patient support apparatus 10. The weight measuring module 101 can also feed information to the central information server 400 when the patient support apparatus 10 is empty, such as when the patient exits the patient support apparatus 10.

[0031] In one version of the weight measuring module 101, an intermediate frame 201 is equipped with sensors S (described further below) and is operatively coupled to the patient support deck 12 to weigh the patient. In some versions, as the deck sections 12a, 12b, 12c, 12d move (e.g., articulate), so do sections of the intermediate frame 201 (referred to below as planks 201a, 201b, 201c, 201 d). In other versions, the weight measuring module can be a sheet or a mattress with a built-in patient weight measuring module. For example, the weight measuring module could be built into the patient support deck 12, i.e., the features of the intermediate frame 201 described herein could instead form part of each of the deck sections 12a, 12b, 12c, 12d of the patient support deck 12. The weight measuring module 101 is activated once the patient is on the patient support apparatus 10 and will send information (e.g., patient weight and other patient information described below) to the central information server 400 and/or one or more electronic devices via one or more communication modules.

[0032] Portable electronic devices 105 can also display the weight of the patient when requested via an input button I, such as on a mobile phone, tablet, or the like. As a result, a caregiver may be able to remotely view the weight of one or more patients under their care. One or more cameras C may also be arranged to take one or more images of the patient support apparatus 10 and/or the patient and a control module 204 can process the images to determine if other items, such as extra pillows, bags, patient equipment, or the like are also present on the patient support apparatus 10, which may affect the weight measurement. This ensures that accurate weight is being measured of the patient, such as by providing an alert when such additional items are present. The system 100 is capable of storing weight information locally as well as on a data cloud, which can be easily retrieved whenever the weight history of the patient is needed. Further, this information can be stored at another location or inside the hospital or on a cloud server. The system 100 may also comprise a tare function (see "set zero" interface in Figure 9C) that allows the caregiver to eliminate the weight measurements associated with extra items present on the patient support apparatus such as those described above. In other words, the tare functionality permits the system 100 to isolate the weight of the patient from the extra items on the patient support apparatus 10. In some instances, if the patient is on the patient support apparatus 10 while the caregiver attempts to use the tare function, the caregiver may be alerted that the tare functionality is temporarily unavailable. For example, the control unit 204 may be programmed to prevent the tare function when the weight reading is 501bs or greater, lOOlbs or greater, or the like.

[0033] As shown in Figures 1-2B, the intermediate frame 201 comprises at least one plank 201a, 201b, 201c, 20 Id (also referred to as a section, board, or panel), a head-end frame 202, and a foot-end frame 203. In one version, the head-end frame 202 is fixed to the plank 201a and the foot-end frame 203 is fixed to the plank 201 d. The frames 202, 203 may be fixed to the planks 201a, 20 Id via fasteners, welding, or the like. The intermediate frame 201 is placed between the patient support deck 12 and a mattress 20. In the illustrated embodiments, the intermediate frame 201 comprises four planks 201a, 201b, 201c, 20 Id. It is contemplated that the intermediate frame 201 could comprise three or fewer planks. It is also contemplated that the intermediate frame 201 could comprise five or more planks. The planks 201a, 201b, 201c, 201d could be separate, independent planks, or may be connected to one another by way of connecting links, joints, or the like.

[0034] Referring to Figure 5, each of the planks 201a, 201b, 201c, 201 d may comprise a core layer 2013 disposed between a first face sheet 2011 and a second face sheet 2012. The face sheets 2011, 2012 may be made of material selected from one or more of a metal, a plastic or a reinforced plastic. When reinforced plastic is selected, the reinforced plastic may be reinforced with carbon, aramid, glass or hybrid fibers. The hybrid fibers may comprise either synthetic or natural fibers, or a combination of synthetic and natural fibers. The mattress 20 may comprise a top layer comprising a foam or other suitable material. [0035] Referring to Figures 6A-6E, supporting structure 2014 may be incorporated into the first face sheet 2011, the second face sheet 2012, and/or the core layer 2013. The supporting structure 2014 may have the benefit of reducing weight and/or costs of the first face sheet 2011, the second face sheet 2012, and/or the core layer 2013. The supporting structure 2014 may also reinforce the first face sheet 2011, the second face sheet 2012, and/or the core layer 2013 to increase rigidity. For example, as shown in various examples of supporting structures 2014 shown in Figures 6A-6E, the supporting structures 2014 may comprise additional ribs R, angled walls W, and other structural elements. Additionally, the supporting structures 2014 may be arranged in a specific geometry such as honeycombed (see Figure 6E), corrugated, and/or layered for effective transfer of load from the patient to enable measurement of the patient's weight.

[0036] Referring to Figures 7A-7C, patient load 30 is divided into three components which comprises a normal load 30a, inclined load 30b and shear load 30c. The shear load is the loading force applied to the plane of loading when the loading force acts parallel to the plane of loading. Normal load is the maximum downward (compression) load or force that can be applied to a mechanical component perpendicular to the loaded surface such as the center of force, or the center of gravity of the load, which is located in the center of the loaded surface. Inclined load is the loading force applied to the plane of loading when the loading force acts at some angle to the plane of loading. Different geometries of the supporting structures 2014 are represented in Figures 7A- 7C. Each of Figures 7A-7C illustrate different supporting structure 2014 (see solid and broken lines) to facilitate the effective transfer of patient loads to load cells 2015a, 2015b, 2015c, 2015d (discussed further below).

[0037] In one embodiment shown in Figure 5, the planks 201a, 201b, 201c, 20 Id include the core layer 2013 and the core layer 2013 comprises the supporting structure 2014. In this version, the supporting structure is rigid material of greater thickness than the face sheets 2011, 2012. The core layer 2013 is adapted to attach to the first face sheet 2011 and is disposed between the face sheets 2011, 2012. In other embodiments, the planks 201a, 201b, 201c, 201d may not include a core layer. Instead, the first face sheet 2011 comprises the supporting structure 2014 and/or the supporting structure 2014 is integrally formed with the first face sheet 2011.

[0038] In one version of the intermediate frame 201, such as shown in Figure 4, load cells 2015a, 2015b, 2015c, 2015d are deployed on each corner of the core layer 2013. In other versions, the load cells 2015a, 2015b, 2015c, 2015d may be deployed on each corner of the first face sheet

2011 or may be connected to both the first face sheet 2011 and the second face sheet 2012. The load cells 2015a, 2015b, 2015c, 2015d are coupled to the control module 204 and configured to generate signals transmitted to the control module that are responsive to load supported above the first face sheet 2011. The core layer 2013 may be secured between the first face sheet 2011 and the second face sheet 2012 by means of any fasteners, including adhesives or mechanical fasteners. The aim of providing the supporting structures 2014 to the core layer 2013 and/or face sheets 2011,

2012 is to measure the weight of all components of load in different directions accurately. Another aim of providing the supporting structures 2014 to one or more of the core layer 2013 and/or face sheets 2011, 2012 is to increase the rigidity of the planks 201a, 201b, 201c, 20 Id to ensure that all load is transferred to the load cells 2015a, 2015b, 2015c, 2015d.

[0039] Referring to Figures 1, 2, 2B, and 4, the head-end frame 202 and foot-end frame 203 act as protection barriers for the patient and prevent direct touching of the patient and the mattress 20 on the patient support deck 12. Referring to the embodiment illustrated in Figure 2B, plank side rails 24 may be coupled to the planks 201a, 201b, 201c, 201 d to serve as additional protection barriers. The aim of providing the frames 202, 203 and the plank side rails 24 is to accurately measure weight of the patient. More specifically, the frames 202, 203 and the plank side rails 24 prevent the mattress 20 from rubbing against other components of the patient support apparatus 10, such as the headboard 18, footboard 19, and side rails 21 thereby mitigating opportunity for a load of the mattress 20 and/or a load of the patient supported by the mattress 20 to be unaccounted for when the load cells 2015a, 2015b, 2015c, 2015d are generating output signals responsive to load disposed on the first face sheet 2011. This configuration is particularly advantageous when the mattress 20 comprises an air mattress. For example, when the air mattress is inflated, pressure from inside the air mattress may result in surfaces of the air mattress being brought into contact with the headboard 18, the footboard 19, and/or the side rails 21 of the patient support apparatus 10, which may cause load to be transferred to the headboard 18, the footboard 19, and/or the side rails 21 and result in an inaccurate weight signal.

[0040] In some versions, the frames 202, 203 and plank side rails 24 are mounted to the first face sheet 2011 of their associated planks and extend upwardly from the first face sheet 2011. In the version shown, the frames 202, 203 and plank side rails 24 are attached to sides of each plank and extend upwardly therefrom. In some cases, the frames 202, 203 and plank side rails 24 are attached to the planks so that the frames 202, 203 and plank side rails 24 remain spaced from the deck sections 12a, 12b, 12c, 12d when the planks 201a, 201b, 201c, 201 d are located on the deck sections 12a, 12b, 12c, 12d. It should be appreciated that while only two plank side rails 24 are shown in Figure 2B, more or fewer plank side rails 24 may be present, and one or more plank side rails 24 may be present on each of the planks 201a, 201b, 201c, 201 d.

[0041] Although not shown in the Figures, the planks 201a, 201b, 201c, 201d may be connected to each other and/or to the control unit 204 through wires and communicate to each other. It is also contemplated that the planks 201a, 201b, 201c, 20 Id and/or the control unit 204 may communicate to each other wirelessly.

[0042] As shown in Figure 4, a plan view of the core layer 2013 is shown with the face sheets 2011, 2012 removed for ease of description. The core layer 2013 comprises load cell grids 2016 and the core layer 2013 comprises each of the load cells 2015a, 2015b, 2015c, 2015d located in cells of the grids. For example, the plank 201a illustrates a grid of four cells, with each of the load cells 2015a, 2015b, 2015c, 2015d located in one of the cells. In the version shown, each of the planks 201a, 201b, 201c, 201d comprises at least one load cell 2015a, 2015b, 2015c, 2015d placed at each quadrant of each plank 201a, 201b, 201c, 201 d, preferably at each corner to sense or monitor load anywhere on the intermediate frame 201. The load cell grids 2016 help in determining changes in the position of the patient on the intermediate frame 201. In other words, the control module 204 is able to determine which quadrant of each plank 201a, 201b, 201c, 20 Id is receiving the largest signals, so that the control module 204 can then determine in which quadrant(s) the patient is located on each plank 201a, 201b, 201c, 201 d, to thereby determine the patient's overall position on the intermediate frame 201. As shown in the embodiment illustrated in Figure 4, the planks 201a, 201b, 201c, 201 d may have varying widths and lengths. Despite the differences in width and length of the planks 201a, 201b, 201c, 201d, the control module 204 may receive signals from the load cells 2015a, 2015b, 2015c, 2015d of each plank 201a, 201b, 201c, 20 Id and generate a signal indicating the weight of the patient and patient location on the intermediate frame 201 in response. The output module 206 display shown in Figure 9B illustrates one example of output showing the patient's position on each plank.

[0043] Figure 8 shows one arrangement of the load cells 2015a, 2015b, 2015c, 2015d in each plank 201a, 201b, 201c, 201 d. The load cells 2015a, 2015b, 2015c, 2015d are placed at the corner of each of the planks 201a, 201b, 201c, 201 d, which are linked to each other either wired or wirelessly. Four load cells 2015a, 2015b, 2015c, 2015d are shown, but more or fewer load cells could be employed in other embodiments. The signals from the load cells 2015a, 2015b, 2015c, 2015d can be processed by a processing unit PU capable of monitoring, processing and controlling signals from the load cells 2015a, 2015b, 2015c, 2015d. Each processing unit PU may then communicate with the control module 204, either wired or wirelessly. The load cells 2015a, 2015b, 2015c, 2015d can provide a measure for pressure, weight, or mass. The processing unit PU may further comprise an angle sensor such as an inclinometer, an accelerometer, and/or another sensor configured to generate signals to the control module 204 responsive to angular position of the planks 201a, 201b, 201c, 201 d relative to gravity. The control module 204 is configured to receive the signals from the angle sensor. In one embodiment, the control module 204 may be configured to factor the angular position of the planks 201a, 201b, 201c, 201 d when computing the weight of the patient. In another embodiment, the control module 204 may be configured to prevent computing of the weight of the patient until the angular position of the planks 201a, 201b, 201c, 20 Id are generally level with respect to gravity.

[0044] As shown in one embodiment illustrated in Figures 8 and 12, the load cells 2015a, 2015b, 2015c, 2015d comprise planar beam load cells. It is contemplated that the load cells 2015a, 2015b, 2015c, 2015d may comprise other types of load cells adapted to generate signals responsive to load supported by the intermediate frame 201.

[0045] Referring to Figure 12, one embodiment of the load cells 2015a, 2015b, 2015c, 2015d is shown in detail. The load cell 2015c comprises a body having a mounting portion 220 and a deformable portion 222. One or more strain gauges may be mounted to the body at an interface of the mounting portion 220 and the deformable portion 222. The mounting portion 220 is coupled to the core layer 2013 (or could be mounted directly to the first face sheet 2011 when the core layer 2013 is absent). The deformable portion 222 extends from the mounting portion 220. The load cell 2015c further comprises a foot 224 coupled to the deformable portion 222. The second face sheet 2012 defines an aperture 226 and the foot 224 extends from the deformable portion 222 through the aperture 226 and past an outer surface 228 of the second face sheet 2012. The foot 224 may be coupled to or otherwise be supported by the patient support deck 12a, 12b, 12c, 12d. In this embodiment, the core layer 2013, the face sheets 2011, 2012, and the mounting portion 220 of the load cell 2015c collectively form a rigid structure. When load, e.g. the patient, is applied to the plank 201a, the core layer 2013, the face sheets 2011, 2012 and the mounting portion 220 are configured to move relative the deformable portion 222 and the foot 224. More specifically, the deformable portion 222 is adapted to deform/deflect relative the mounting portion 220 and the one or more strain gauges are adapted to generate one or more signals responsive to the deformation/deflection between the deformable portion 222 and the mounting portion 220. The control module 204 is adapted to receive the one or more signals from the one or more strain gauges and determine the load applied corresponding to the deformation/deflection.

[0046] In the above embodiment, it is appreciated that the second face sheet 2012 serves as a protective cover and could be removed without compromising functionality of the load cell 2015c to generate signals providing accurate weight measurements. Further, it is contemplated that the core layer 2013 could be removed and instead the mounting portion 220 could be coupled directly to the first face sheet 2011. In such a configuration, the first face sheet 2011 would comprise supporting structure 2014 to provide rigidity to the first face sheet 2011.

[0047] As shown in Figure 13, an embodiment employing both the first and second face sheets 2011, 2012 with the load cell 2015c is shown. This embodiment may not include the core layer 2013. One or more strain gauges may be mounted to the body of the load cell 2015c at the interface of the mounting portion 220 and the deformable portion 222. The mounting portion 220 is coupled (e.g., fixed) to the first face sheet 2011. The deformable portion 222 extends from the mounting portion 220. The deformable portion 222 is coupled (e.g., fixed) to the second face sheet 2012. Both the first and second face sheets 2011, 2012 comprise supporting structure 2014 to provide rigidity to the respective face sheets 2011, 2012. The first face sheet 2011 is spaced from the second face sheet 2012 such that the first and second face sheets 2011, 2012 can move toward each other when a load, such as the patient, is applied. The mounting portion 220 is configured to move with the first face sheet 2011 and the deformable portion 222 is configured to move with the second face sheet 2012. When load is applied to the plank 201a, the first face sheet 2011 and the mounting portion 220 are configured to move relative the second face sheet 2012 and the deformable portion 222. More specifically, the deformable portion 222 is adapted to deform/deflect relative the mounting portion 220 when the face sheets 2011, 2012 move toward each other and the one or more strain gauges are adapted to generate one or more signals responsive to the deformation/deflection between the deformable portion 222 and the mounting portion 220. The control module 204 is adapted to receive the one or more signals from the one or more strain gauges and determine the load applied corresponding to the deformation/deflection.

[0048] An output module 206 is depicted in Figures 9A and 9B and comprises a display unit DU which can be any console interface, LED display, LCD panel, or the like, at the head end and/or foot end (see Figures 2 and 11) of the patient support apparatus 10, at any suitable location on the patient support apparatus 10, and/or at some distance from the patient support apparatus 10 linked remotely to the patient support apparatus 10. In one embodiment, there is one display unit DU showing information of the patient including vital signs of the patient such as respiratory pattern, fluid percentage of the body, height, and temperature, moisture content of the body, bed sore grade, weight of the patient etc., another display unit DU for showing position of the patient on the patient support apparatus 10 (see Figure 9B), and handheld display units DU of the user, such as those on portable electronic devices, e.g., phones and tablets (see Figure 2).

[0049] The mattress 20 is mounted on the intermediate frame 201 for receiving the patient thereon. The weight and movement of the patient lying on the patient support apparatus 10 can be detected by the intermediate frame 201 by the way of the load cells 2015a, 2015b, 2015c, 2015d. In one embodiment, the mattress 20 is provided with air inflated cells to support the body of the patient. Figure 3 depicts the mattress 20 provided with a pump 20b for inflating the cells and a body massager 20a. The pump 20b is provided for inflating the cells to prevent deep vein thrombosis in patients and the body part massager 20a is provided for preventing bed sores in patients. The mattress 20 is adapted in such a way so that it does not touch the headboard 18, footboard 19, or side rails 21 of the patient support apparatus 10 and does not move outside the boundary of the patient support apparatus 10 defined by the head-end frame 202, foot-end frame 203, and/or plank side rails 24 of the intermediate frame 201. In the illustrated embodiment the mattress 20 is provided with patient information sensors S that can sense temperature and height of the patient, or other parameters of the patient, as described herein.

[0050] Figure 2 depicts components of the control module 204 and an input module 205 of an information measuring module. The information measuring module is provided on the intermediate frame 201 to enable specific input/output/control of electronic elements of the intermediate frame 201 for desired operation thereof and monitoring of operating conditions of the electronic elements and additional patient support apparatus conditions. The control module 204 enables monitoring of the current status of the operational parameters of the electronic elements of input modules 205; evaluation of accumulated data with a set of standard operational characteristics providing the system 100 with a means for detection of potential fault or error when a specified electronic element is not operating within a desired or predetermined range; producing alarm(s) if there is any deviation in the predetermined range and/or current operational values of an electronic element; and then sending of commands to, electronic devices or other devices to perform predefined action(s). For example if readings from one of the load cells 2015a, 2015b, 2015c, 2015d is being monitored and an extraneous load reading is detected, the system 100 can re-query the load measuring component to evaluate if it was merely an inaccurate reading. Each of the electronic elements associated with the intermediate frame 201 or the patient support apparatus 10 can be monitored in this manner.

[0051] The control module 204 further performs the act of continuous monitoring or periodic monitoring of the different parameters of a patient by taking, in real-time, patient data from various sensors S and comparing it against one or more standard values for that given parameter which has been pre-fed into the system 100 and stored in memory in the control module 204. The parameters of the patient refers to the various vital signs, or other patient information, being monitored by the control module 204. The control module 204 is capable of querying the patient information sensors S for current readings for comparison with operational parameters and periodic monitoring is performed against pre-fed data (also referred to as predetermined data). For example, the control module 204 may be programmed with various prescribed patient protocols, e.g., patient repositioning, reorientation, mobility, or the like, with the change to be performed over predetermined time periods, such as every two hours. The control module 204 is also capable of comparing patient data before and after the prescribed protocols. If the scheduled prescription has not been administered or followed, the control module 204 can trigger notification/alarm to the concerned surgeon or user. The patient information sensors S may be provided on the mattress 20, on one or more of the planks 201a, 201b, 201c, 20 Id, tethered to the mattress 20 and/or one or more of the planks 201a, 201b, 201c, 201 d, or otherwise provided to sense various parameters of the patient. The sensors S may comprise various attachment devices, if needed, for attaching portions of the sensors S to the patient to obtain certain readings, such as tape, adhesive, or other methods.

[0052] In one embodiment, the control module 204 is provided with the ability of calculating body fat of the patient using a Bioelectrical Impedance Vector Analysis (BIVA) method via one or more of the patient information sensors S. The BIVA method actually determines the electrical impedance, or opposition to the flow of an electric current through body tissues which can then be used to estimate total body water (TBW), which can be used to estimate fat-free body mass and, by difference with body weight, body fat.

[0053] The control module 204 can detect fluid overload /dehydration in the body with one or more of the patient information sensors S. Dehydration is a recognized factor affecting the BIVA measurements as it causes an increase in the body's electrical resistance, and has been measured to cause a 5 kg underestimation of fat- free mass i.e. an over estimation of body fat.

[0054] One or more of the patient information sensors S may be configured to generate one or more input signals to be transmitted to the control module 204 responsive to moisture content at localized regions of the patient's body for predicting potential bed sores and their severity. The control module 204 may be configured to generate a signal to be transmitted to the output module 206 in response to the signals received from the patient information sensors S. The display of the output module 206 may then display bedsore information responsive to the signal received from the control module 204, such as when the humidity sensor S detects humidity above a threshold.

[0055] Further, the control module 204 is provided with the ability of monitoring a respiratory pattern of the patient with one or more of the patient information sensors S and generating an alarm when the respiratory pattern of the patient is uneven and/or beyond a standard value which has been pre-fed into the system 100 and stored in the control module 204.

[0056] In addition to the aforementioned features, the control module 204 can calculate the body mass index (BMI) of the patient with the help of the height of the patient, enabling the system 100 to predict a patient's risk for diseases that can occur with being overweight or obese.

[0057] In one embodiment, the control module 204 initializes or calibrates the operation of each of the electronic elements, for example actuators and/or patient information sensors S, so that these electronic elements can provide the desired level of accuracy and desired functionality to the patient support apparatus 10.

[0058] In one embodiment, the control module 204, while providing control of the functionality of the patient support apparatus 10, can additionally ensure that a procedure requested to be performed on the patient is both possible and safe to be performed. In this scenario the control module 204 can evaluate the current status of the patient support apparatus 10, and determine if the selected function is possible. The evaluation of the requested function is determined based on the current treatment of the patient.

[0059] In one embodiment, the control module 204 is designed using an interface- controller-model architecture. The user interface can provide user access to the functions of the patient support apparatus 10, as well as provide a query or notification system that can provide access to patient support apparatus information and/or information about the patient. The term 'user' for the purposes of this specification refers to the persons accessing the real-time patient data including the nursing staff, doctors, surgeons, and/or other authorized personnel. The user interface may comprise a touchscreen user interface, mechanical buttons, gesture-sensors, or the like to receive input from the user and generate corresponding input signals to be received by the control module 204.

[0060] The input module 205 shown in Figure 2 comprises memory, the patient information sensors S (including the sensors S from the mattress 20) such as infrared sensors, light reflection sensors, humidity sensors, impedance sensors, force sensors, temperature sensors, cameras, scanners, vital signs monitoring sensors (e.g., intelligent sensors or any measurement module having processors that can measure and record key vital signs (such as heart rates and respiration rates)), height sensors (e.g., optical, infrared, ultrasonic) for sensing height of the patient, etc.

[0061] Another example of a patient information sensor S is a flexible exam camera 205a provided in one or more of the planks (shown only in one plank 201b for illustration) for detecting status of blood vessels of the patient. The system 100 is capable of providing pictures of bedsore areas using the flexible exam camera 205a.

[0062] In the embodiment illustrated in Figure 2, the one or more cameras C may be provided either at the head end or foot end of the patient support apparatus 10 or at some distance from the patient support apparatus 10. The one or more cameras Ca can be oriented in all directions to provide a continuous visual communication between the caregiver and the patient.

[0063] In one embodiment illustrated in Figure 11, an X-ray image cassette holder 208 is provided in an X-ray slot 207 in the plank 201a for taking X-ray images of the patient using X-ray image cassettes 209 placed in the X-ray image cassette holder 208. The X-ray image cassette holder 208 may be in the form of a sliding drawer. In the illustrated embodiment, only one plank 201a defines an X-ray slot 207 for receiving the X-ray image cassette holder 208. In other embodiments, one or more of the planks 201a, 201b, 201c, 20 Id define X-ray slots for receiving an X-ray image cassette holder. In one embodiment, the core layer 2013 of the plank 201a defines the X-ray slot 207. In other embodiments, the face sheets 2011, 2012 and the core layer 2013 collectively define the X-ray slot 207. The X-ray image cassette holder 208 is moveable to an engaged position and to a disengaged position. In the engaged position, the X-ray slot 207 receives the X-ray image cassette holder 208 within the X-ray slot 207. In the disengaged position, the X- ray image cassette holder 208 is extended away from the patient support apparatus 10. More specifically, in the disengaged position the caregiver may separate the X-ray image cassette holder 208 from the patient support apparatus 10 such that the X-ray image cassette holder 208 may be transported away from the patient support apparatus 10. Movement of the X-ray image cassette holder 208 between the engaged position and the disengaged position is independent of load supported on the intermediate frame 201. In other words, the X-ray image cassette holder 208 may be moved to the engaged and disengaged positions regardless of whether the patient is supported by the intermediate frame 201. In this manner, a caregiver need not manipulate the patient to place the X-ray image cassette holder 208. In some instances, this feature can eliminate the need for multiple caretakers when taking X-rays. Further, reduced manipulation of the patient when taking X-rays may mitigate risks of extubation or dislodging of drains, IV, etc. from the patient if present.

[0064] The control module 204 and the input module 205, which is coupled to the input module 205, may be linked to the network by any kind of known serial communication networks. The control module 204 and the input module 205 can also be wireless, based on various wireless communication networks such as Bluetooth communication, Zigbee communication, RF (Radio Frequency field propagation) communications, Infrared communications, Ultrasound communications, etc. Moreover, the control module 204 and/or input module 205 can communicate with apparatuses other than the patient support apparatus 10. The control module 204 and/or the input module 205 can have an antenna to communicate with and control functions of the other apparatuses through wireless communication or through wired communication. In the illustrated embodiment, the patient support apparatus 10 comprises the intermediate frame 201 and comprises one or more patient information sensors S or detectors for sensing and detecting the status of functional components of the patient support apparatus 10, vital signs, moisture of skin, body fat, temperature of a patient, etc. For example, sensors or detectors can be appropriately designed load sensors, pressure sensors, temperature sensors or any other type of sensor or detector that would be appropriate for integration into a patient support apparatus 10. Each of these sensors or detectors can be configured to evaluate a desired piece of information relating to the supported person or the patient support apparatus 10 itself. Moreover, in one version of the intermediate frame 201, each of the planks 201a, 201b, 201c, 20 Id are also provided with a built-in fan F (see Figure 8), coupled to and controlled by the processing unit PU and/or control module 204, for better circulation of air and to reduce the heating of the planks 201a, 201b, 201c, 20 Id due to processors and electronic devices integrated in the planks 201a, 201b, 201c, 201 d. The input module 205 may further comprises a translator TL, speaker SP, and/or microphone MP for improving communication between the user and patient.

[0065] The system 100 can include a definition or description of the patient support apparatus' operational parameters, for example desired operating conditions in the form of a virtual machine model, database, or the like. The system 100 can also read information from the model or database enabling the system 100 to check whether it is performing in a desired state or not.

[0066] In one embodiment, the control module 204 is deployed in such a manner, that a central processing unit (CPU) of the control module 204 is installed in the intermediate frame 201 so that it acquires all the data coming from the patient information sensors S (accumulated data), user input(s), and based on the information, the program of the system 100 sends signals to the various electronic devices to determine and/or adjust for any deviation in the data.

[0067] The control module 204 may comprise one or more processors, microprocessors, single integrated circuits (IC), memory, and peripheral interfaces, or the like, which may be installed in the intermediate frame 201 for sending data between microcontrollers and small peripherals devices such as sensors and memory. The control module 204, upon detection of a fault or error, activates one or more alarms that can be visible, audible, tactile, or other form of fault indication.

[0068] The position of the patient can be graphically displayed at a remote monitoring station RMS (see Figure 2) where the position can be displayed either in a color-coded position diagram or in image form of the patient showing position. In one embodiment, based on the patient' s position, the state of the patient exiting the patient support apparatus 10 can be determined and an appropriate alarm is activated if the patient is about to fall or in any inappropriate position.

[0069] In one embodiment shown in Figure 9C, current weight, change since weight was last recorded, time in a current turn position, and bed sore location information are displayed. Additionally, the user may access data, such as weight trend, turn log, and bed sore report using touch- selectable buttons (e.g., on a touchscreen) as shown. The weight trend may display a change in weight of the patient over a predetermined duration or since the caregiver starting recording the weight for a given patient. The turn log may display turn history, including amount of time in each turned position (e.g., left or right), amount of time not turned, or any suitable history of patient turn information. The bed sore report function may allow a caregiver to select additional bed sore locations on a graphical representation of the patient via user input (e.g, touchscreen input) to report the bed sore locations and save the bed sore locations to the network. A bed sore label (e.g., circles) may be added to the graphical representation of the patient on the display as shown.

[0070] In one embodiment, the translator TL, a speaker SP and a microphone MP may also be provided as components of the output module 206. A music player may also be provided in the intermediate frame 201, as part of the output module 206, or other located on the patient support apparatus 10, to reduce the anxiety among the patients.

[0071] In one embodiment, the output module 206 comprises security features to ensure that only authorized personnel access the output module 206 to thereby prevent the misuse of the output module 206. In one embodiment, the output module 206 comprises a digital recognition system that allows only authorized users to operate the output module 206. Recognition can be made based on fingerprints, iris patterns, etc. The output module 206 can have an antenna to communicate with and control functions of other apparatuses through wireless communication or wired communication. The output module 206 is linked to the patient support apparatus 10, the control module 204, and/or the input module 205, through Bluetooth communication, RF (Radio Frequency field propagation) communications, Infrared communications, Ultrasound communications, wired communication, etc. Moreover, the output module 206 can communicate with apparatuses other than the patient support apparatus 10. The input module 206 can have an antenna to communicate with and control functions of the other apparatuses through wireless communication or through wired communication. [0072] In addition to providing the necessary algorithms to control and monitor the functions of the system 100, software operable by the control module 204 may provide a graphical user interface (GUI) to organize the various functions of the patient support apparatus 10. The GUI can display a set of symbols such as "icons" and buttons in any arrangement for a particular function, for example, patient support apparatus motion. The GUI can be configured such that the operation of each function is easy to understand for the nursing staff. Examples of functions that can be operated or monitored from the display unit DU of the output module 206, for example, are: patient weight, apparatus motion, patient motion, alerts, exit and bed sore history, diagnostics, etc. The actual screen displays and menus of the touch screen for a particular patient support apparatus will be determined by the functions of the patient support apparatus and the needs of the operator.

[0073] The patient and/or the patient support apparatus 10 may comprise a central communication reference or unique identifier, such as a unique code including but not limited to bar code, QR code, attached preferably on the foot end of the patient support apparatus 10, which can be read through any bar code reader or point of scale scanner or camera or through any signal strength or wireless emitter via any wireless communication means such as Bluetooth, WiFi and Radio Frequency (RF) communication, infrared communication to capture and read the information of the patient, information of patient support apparatus 10, etc. during the stay of the patient on the patient support apparatus 10. The reference/ unique identifier may be used to track the patient information on or near the patient support apparatus 10. The reference/unique identifier can be stored and transmitted from a wireless emitter, such as the electronic device 103, which may be a RFID tag. [0074] The central information server 400 comprises servers and storage devices to link the data to the network (e.g., a hospital network) for managing information of the patient and/or patient support apparatus 10 remotely so that the user can remotely access the data. In one embodiment, the intermediate frame 201 is adapted to wirelessly communicate with the hospital network to transmit data of the patient and/or the patient support apparatus 10 to the hospital network. The data which is stored or transmitted may include any information of the patient for example test results, past histories, vital signs information, weight, height of the patient, or the like. The linking of the data to the hospital network servers may provide remote access to the data by one or more users. Moreover updates of the software and operational parameters may be provided to the control module 204, input module, 205, output module 206 or the like, when desired. Linking data to the network enables the centralization of patient and patient support apparatus monitoring which assists in providing more efficient patient care.

[0075] Referring to Figure 10, patient information may be transmitted either wired or wirelessly by the patient support apparatus 10 to a remote station located on the hospital network where the accumulated data and /or information received is processed to configure or control the patient support apparatus 10 or various other systems. In one embodiment, the remote monitoring station RMS is positioned at a central nurse's station in the healthcare facility and is implemented in a workstation for use at the central nurse station. The workstation may include software to manipulate the data received from the various systems or the patient support apparatus 10. The workstation is configured to receive data from the control module 204, input module 205, and/or the electronic device 103 to transmit the reference/unique identifier, or to transfer data back to the modules 204, 205, 206. The workstation may comprise a plurality of monitors/screens to assist the caregiver in comparing and cross-referencing information retrieved via load cells and patient information sensors with information saved on the network.

[0076] It should be noted that in many of the figures described herein, certain components of the patient monitoring system 100 have been removed for convenience of description and ease of illustration.

[0077] Several configurations have been discussed in the foregoing description. However, the configurations discussed herein are not intended to be exhaustive or limit the invention to any particular form. The terminology which has been used is intended to be in the nature of words of description rather than of limitation. Many modifications and variations are possible in light of the above teachings and the invention may be practiced otherwise than as specifically described.

Claims

CLAIMS What is claimed is:

1. A patient monitoring system comprising:

a plurality of planks;

a plurality of load cells coupled to each plank, the plurality of load cells configured to generate first input signals responsive to a load applied to each plank for measuring patient weight; one or more patient information sensors being different from the plurality of load cells, the one or more patient information sensors configured to generate one or more second input signals responsive to one or more patient parameters different from patient weight;

a control module coupled to the plurality of load cells of each plank and the one or more patient information sensors, the control module configured to receive the first input signals and the one or more second input signals and generate one or more output signals responsive to the first and second input signals; and

an output module coupled to the control module, the output module configured to receive the one or more output signals from the control module and to indicate to a caregiver the patient weight and the one or more patient parameters different from patient weight.

2. The patient monitoring system of claim 1, wherein each of the plurality of planks comprise one or more of a metal, a plastic, and a reinforced plastic.

3. The patient monitoring system of claim 2, wherein the reinforced plastic comprises one or more of carbon, aramid, glass and hybrid fiber.

4. The patient monitoring system of any of claims 1-3, wherein each of the plurality of planks comprises supporting structure for providing rigidity to the plurality of planks.

5. The patient monitoring system of claim 4, wherein at least one of the plurality of planks comprises a first face sheet configured to face the patient and a second face sheet opposite the first face sheet, and the at least one of the plurality of planks further comprises a core layer disposed between the first and second face sheets, with one or more of the core layer and the first and second face sheets comprising the supporting structure, and wherein the plurality of load cells for the at least one of the plurality of planks are attached to one of the core layer and the first face sheet.

6. The patient monitoring system of claim 4, wherein at least one of the plurality of planks comprises a first face sheet configured to face the patient and a second face sheet opposite the first face sheet, with the first and second face sheets comprising the supporting structure, and wherein the plurality of load cells for the at least one of the plurality of planks are attached to both the first and second face sheets.

7. The patient monitoring system of any of claims 4-6, wherein the supporting structure comprises ribs.

8. The patient monitoring system of any of claims 4-7, wherein at least a portion of the supporting structure comprises one or more of a foam, a corrugated structure, a honeycomb structure, and a structure having ribs disposed between two generally planar panels.

9. The patient monitoring system of any of claims 1-8, wherein the plurality of load cells for each of the plurality of planks generate the first input signals responsive to normal load, shear load, and inclined load transferred from one of the face sheets to the plurality of load cells.

10. The patient monitoring system of any of claims 1 -9, wherein the one or more patient information sensors are adapted to generate signals responsive to patient vital signs.

11. The patient monitoring system of any of claims 1-10, wherein the one or more patient information sensors comprise one or more of a humidity sensor, an impedance sensor, a pressure sensor, a temperature sensor, an image sensor, an infrared sensor, a light reflection sensor, a force sensor, a heart rate sensor, a respiration sensor, and an ultrasonic sensor.

12. The patient monitoring system of any of claims 1-11, further comprising a reference coupled to the control module and configured to track patient information comprising at least one of the patient weight, the one or more patient parameters different from weight, and patient support apparatus information.

13. The patient monitoring system of claim 12, wherein the reference comprises a unique identifier selected from one of a bar code, a quick response (QR) code, and a radio frequency identification (RFID) tag.

14. The patient monitoring system of any of claims 12-13, further comprising a central information server coupled to the reference, with the central information server comprising one or more of a server and a storage device to store the tracked patient information and link the tracked patient information to a hospital network for managing information of the patient remotely.

15. The patient monitoring system of any of claims 1-14, wherein the output module comprises one or more display devices configured to display patient weight and patient position on the plurality of planks responsive to the output signal received from the control module.

16. The patient monitoring system of any of claims 1-15, wherein the output module comprises one or more of a microphone, a translator, and a speaker.

17. The patient monitoring system of any of claims 5 and 6, further comprising an X- ray image cassette holder for taking X-ray images of a patient, wherein one or more of the plurality of planks defines a slot for receiving the X-ray image cassette holder.

18. The patient monitoring system of claim 17, wherein the slot is defined between the first and second face sheets, and wherein the X-ray image cassette holder is movable to an engaged position and a disengaged position, and wherein the slot permits movement of the X-ray image cassette holder to the engaged and disengaged positions when the patient is supported by the plurality of planks.

19. The patient monitoring system of any of claims 1-18, further comprising a mattress disposed on the plurality of planks and configured to be interposed between the patient and the plurality of planks, wherein the mattress comprises a top layer configured to face the patient, wherein the top layer further comprises one or more of a body massager and a pump for prevention of deep vein thrombosis.

20. The patient monitoring system of any of claims 1-19, wherein the one or more patient information sensors comprises an impedance sensor configured to generate a signal to the control module responsive to body fluid content in the patient's body.

21. The patient monitoring system of claim 20, wherein the control module is configured to receive the signal from the impedance sensor and generate a signal to be transmitted to the output module to indicate to the caregiver at least one of fluid overload and dehydration.

22. The patient monitoring system of any of claims 1-21, wherein the one or more patient information sensors comprise a humidity sensor, the humidity sensor configured to generate a signal to be transmitted to the control module responsive to moisture content at localized regions of the patient's body for predicting potential bed sores and their severity.

23. The patient monitoring system of claim 22, wherein the output module comprises a display, and wherein the control module is configured to generate a signal to be transmitted to the output module responsive to the signal received from the humidity sensor and the display is configured to display bedsore information responsive to the signal received from the control module.

24. The patient monitoring system of any of claims 1-23, wherein the output module comprises an alarm for alerting the caregiver in response to signals received from the control module.

25. The patient monitoring system of claim 24, wherein the one or more patient information sensors comprise a sensor configured to generate signals responsive to the patient's respiratory patterns, wherein the control module is configured to receive the signal and generate a signal to the output module to trigger the alarm when the respiratory pattern is uneven.

26. The patient monitoring system of any of claims 1-25, further comprising at least one of a head-end frame, a foot-end frame, and a plank side rail coupled to one or more of the plurality of planks for assisting with accurate weight readings.