Optimised adjustable bed

Abstract

The Invention describes an innovative adjustable bed suitable for bariatric applications, which has a bed base that can be placed at a very low level with respect to the floor, and a highly stable symmetrical lifting mechanism. The Invention will make it possible to manage very high loads that may exceed 600 kg, thanks to an enhanced electromechanical structure.

Description

Optimised adjustable bed

[0001] This Invention describes hospital equipment, which can also be used in a domestic setting, for patients who are obese or severely obese, known as bariatric patients. It can be operated using appropriate technological functions to simplify the management of overweight patients.

[0002] In recent decades issues relating to excess body weight have been becoming increasingly widespread throughout the world. While excess weight can have different causes, such as endocrine, metabolic or genetic aspects, it is also the case that lifestyle and dietary habits do not help in managing this condition, and psychological factors can also contribute significantly. This can be inferred by analysing a series of social and cultural factors:people throughout the world are increasingly consuming what is known as a Western diet, with the production of food in which the amount of calories and the ingredients, mainly refined flours, high amounts of sugar and fats, facilitate an increase in weight. This is also evident in the policies of the multinationals that market foodstuffs which are often formulated to create fully-fledged addictions.food is consumed quickly due to very tight work schedules, therefore pre-cooked food or ready meals become necessary, and these generally feature a low amount of nutrients.while changes to working life due to the use of technology have reduced strenuous work, they have also contributed to a sedentary lifestyle, with many work tasks based on the use of computerised equipment requiring employees to be seated for long periods at work, completely physically immobile.exercise is still not promoted sufficiently as a must for improving health, especially among young people.

[0003] Even though some countries have been tackling this by trying to promote a healthier lifestyle, it is clear that decades of poor eating habits and unhealthy lifestyles have led to a rapid rise in obesity in the population, which exacerbates the tendency to suffer from chronic conditions that are appearing at an increasingly younger age.

[0004] If we consider the United States as an example, obesity in the population has reached 30%, a concerning figure that also puts significant pressure on the healthcare facilities providing support.

[0005] The condition of obese patients can become chronic or deteriorate into the category of a bariatric patient i.e. a patient whose severe obesity is causing a range of issues and conditions that are hard to resolve.

[0006] Bariatric patients are prone to serious falls and limitations in the daily activities we all take for granted, such as cooking, using the toilet, climbing stairs and going shopping etc.

[0007] The support services for bariatric patients therefore have to operate in difficult circumstances and have suitable equipment to allow them to work efficiently and without further harming patients.

[0008] According to medical literature, the hospitalisation of patients suffering from obesity (BMI>30) and / or severe obesity (BMI > 40), with a high body weight which has reached as much as approximately 450 kg in recent years, leads to additional problems as technical infrastructure in hospitals is usually standardised for the average patient.

[0009] Standard hospital beds for the average patient usually have a maximum safe capacity of approximately 220 kg and also tend to be too narrow for bariatric patients, who require beds with a much higher safe capacity and a width more suited to their size.

[0010] Currently there are various adjustable beds available in the prior art, even for bariatric applications, such that hospital patients and medical personnel have access to movement functions that ensure a suitable level of assistance.

[0011] The HillRom bed for example, which can be viewed athttps: / www.hillrom.co.uk / en / products / compella-bariatric-bed / is a bariatric bed equipped with numerous mechanical and electronic functions. It can be reduced in size in a longitudinal and crosswise direction for easy handling operations and / or easy adaptation to patient measurements. The bed can also be set up with various stored mechanical positions that can be activated electronically by the operator, and the mattress base can be lowered to a height of just 43 cm from the floor, making it easier for patients to stand.

[0012] Application US2006085914A illustrates a bariatric bed with a central section and backrest that rotate with respect to the underlying frame, enabling patients to put their feet towards the floor to stand up more easily.

[0013] Application US2003079289A1 illustrates another bariatric bed made with various interconnecting rotating sections, which enables a high level of mobility and is designed for positions that facilitate surgery to the abdomen and genital area e.g. the Trendelenburg position or the reverse Trendelenburg position.

[0014] Application US2007089238A1 illustrates a bariatric bed with an upper section for the patient's head and torso that can move with a particular degree of freedom, as it is not hinged to the next section, which is for the leg position.

[0015] Patent US975729B2 illustrates an adjustable bed with a lifting mechanism consisting of a mechanical arm with considerable hoisting capacity and the ability to place the bed base at a distance of approximately 22 cm from the floor. However the equipment in US975729B2 is moved solely by two electric motors and the layout of the lifting mechanism has an asymmetrical structure between the lower and upper sections, raising doubts regarding proper stability when moving on castors, the avoidance of deformation when used over a long-term period, and the centre of gravity position.

[0016] Moreover, the lifting mechanism in US975729B2 partially moves on one or more semi-curved tracks, via the linear displacement of heads in the mechanical sections fitted with rotating bearings that move along the semi-curved direction of the tracks. These aspects of motion do not contribute to a high level of bed stability or rigidity, as it would be better for a lifting mechanism to have mechanical components whose freedom of movement is restricted as far as possible when handling large loads, with the exception of rotational movements about an axis.

[0017] Obviously the movements and functions available with bed sections built for obese patients and which feature in the prior art were researched extensively, to facilitate the hospitalisation of severely obese patients, enable them to receive care and undergo surgery, and ensure that their condition can be managed in a dignified and psychologically supportive manner.

[0018] The aim of this Invention is to devise a bariatric bed that is also suitable for severely obese patients i.e. those whose excess weight and stature limitations restrict their movement considerably, especially when getting out of bed due to reduced leg length, and for whom the minimum height of bariatric beds from the floor in the prior art (approximately 40 cm plus the mattress) is excessive.

[0019] Another aim of this Invention is to devise a bed base lifting / lowering mechanism with capacity for very heavy loads that may even exceed 600 kg.

[0020] Another aim of this Invention is to devise a lifting mechanism that is basically symmetrical between the upper section i.e. the bed base on which the patient lies, and the section underneath which is closer to the floor, and is preferably symmetrical between the two longitudinal ends of the Invention. The aim here is to create an exceptionally strong mechanism that is durable even after extensive use, and which features mechanical stability and precision even during transients caused by actuator motion.

[0021] Another aim of this Invention is to devise a lifting mechanism with mechanical components whose freedom of movement is restricted as far as possible, with the exception of those representing rotational movements about an axis.

[0022] The Invention describes an innovative adjustable bed suitable for bariatric applications, which has a bed base that can be placed at a very low level with respect to the floor, and a highly stable symmetrical lifting mechanism. The Invention will make it possible to manage very high loads that may exceed 600 kg, thanks to an enhanced electromechanical structure.

[0023] The benefits of this Invention are specified below:The Invention consists of a symmetrical mechanical lifting structure fitted with four actuators that work in synergy to ensure a high level of operational stability and precision, even under conditions of heavy and extensive use over long periods of time,The Invention enables the bed base to be lowered towards the floor to a height of approximately twenty centimetres,Thanks to its innovative mechanical layout, the Invention can safely manage loads of greater than 600 kg,The Invention enables the safe inclination of the head and foot section of the bed base, even when supporting heavy loads to the order of 600 kg,the mechanical symmetry of the Invention and the presence solely of joints that rotate in the respective components of the lifting mechanism, make it possible to minimise torque from the actuator motion, a factor which not only can generate initial imprecision and instability in bed base motion, but which can increase wear and tear on mechanical components.

[0024] The table with diagrams is included with the documentation for this application to illustrate the characteristics of the Invention, with application variations highlighted where described. More specifically it includes:Fig.1

[0025] showing an overall view of the electromechanical structure, as per the Invention implementation method,Fig.2

[0026] showing a longitudinal view of the Invention, illustrating extendable mechanical joints, as per the Invention implementation method,Fig.2a

[0027] showing detail of the extendable mechanical connection, as per the Invention implementation method,Fig.3

[0028] showing detail of the axonometric projection of the extendable mechanical connection, as per the Invention implementation method,Fig.4

[0029] showing additional detail of the axonometric projection of the extendable mechanical connection, as per the Invention implementation method,Fig.5

[0030] showing the Invention with the bed base in a position not parallel to the floor, as per the Invention implementation method,Fig.6

[0031] showing detail of the floor clearance space available with the Invention, as per the Invention implementation method,Fig.7

[0032] showing detail of the electric actuators for axial and expanding movement, as per the Invention implementation method,Fig.8

[0033] showing a complete longitudinal view of the main mechanical moving parts in the Invention, as per the Invention implementation method,Fig.9

[0034] showing the position of the moving mechanical components in the Invention in the floor clearance space, as per the Invention implementation method,Fig.10

[0035] showing the symmetry of the innovative equipment in this Invention along the longitudinal and vertical axes.Description of the Invention

[0036] The description of the various methods for implementing this Invention is outlined for illustration purposes, therefore all possible modifications of an obvious nature in its field of application, when carried out by industry operators, will not limit the licence protection terms.

[0037] The equipment described in this Invention relates to additional solutions already known in the prior art which are referred to for correct implementation in the chosen technical environment.

[0038] In the wording of this Invention, reference to an individual technical element may also apply to multiple instances of it in the Invention, unless stated otherwise.

[0039] In the wording of this Invention,bed baseis defined as the section of the Invention used by the patient and which accommodates the mattress.

[0040] In the wording of this Invention,lower baseis defined as the section of the Invention that moves on the floor thanks to the action of four castors, and which is connected to the bed base via extendable mechanical features.

[0041] In the wording of this Invention,foot sectionis defined as the section of the Invention which supports the patient's lower body, including the feet, legs and part of the pelvic region.

[0042] In the wording of this Invention,head sectionis defined as the section of the Invention which supports the patient's upper body, including the head, torso and part of the pelvic region.

[0043] In the wording of this Invention,floor clearanceis defined as the space between the lower base and the floor, resulting from castors secured to the lower base.

[0044] In the wording of this Invention,lifting mechanismis defined as the ensemble of mechanical joints and actuators that move the bed base with respect to the lower base.

[0045] As per the Invention implementation method, the innovation consists of a complete structure illustrated in the axonometric projection of, namely:a bed base (11) and lower base (10) made from two rectangular metal frames arranged horizontally with respect to the floor, with the longitudinal measurement greater than the crosswise measurement. The bed base is positioned vertically above the lower base and accommodates the mattress on which the patient lies,the bed base and lower base have respective rigid crosswise segments (101, 102) joining the respective longitudinal profiles in the mid-section,four extendable mechanical joints (16,17,18,19) representing the initial section of the lifting mechanism,electric actuators for axial and expanding movement (12,13,14,15) representing the final section of the lifting mechanism,control, monitoring and user interface logic for the movements performed by the Invention (100).

[0046] As per the Invention implementation method, the structure of the bed base, lower base and extendable mechanical joints is made of metal such as steel, or other metals and / or their alloys in accordance with the aforementioned application, and in consideration of thickness and magnitude such that the Invention is compliant with the relevant technical requirements.

[0047] shows a longitudinal view of the Invention, illustrating solely the extendable mechanical joints connected to the two bases. As per the Invention implementation method, the bed base (21) and the lower base (20) are mutually constrained via the extendable mechanical joints (22, 23) (given thatshows the side view only two can be seen), with the aforementioned joints connected to the longitudinal profiles of the bases, two on each side, to position the bed base on a vertical axis above the lower base.

[0048] As per the Invention implementation method, the bed base (21) and the lower base (20) are made from two rectangular metal frames arranged horizontally with respect to the floor, with the longitudinal measurement greater than the crosswise measurement and the aforementioned bases positioned vertically one above the other.

[0049] As per the Invention implementation method, the extendable mechanical joint is made from two metal segments (20a, 21a) united at their respective apex by a rotating joint (22a). The other apices are connected to the bed base and lower base respectively with as many rotating joints (23a, 24a), in which

[0050] the extendable mechanical joints are connected to the lower base with suitable fixing brackets (26a) attached to the two crosswise beams that form part of the bed base frame (25a), with the aforementioned beams arranged beneath the longitudinal beams (27a) of the same lower base i.e. in the floor clearance space.

[0051] As per the Invention implementation method, the extendable mechanical joints are connected to the bed base on the longitudinal profiles of the respective frame.

[0052] As per the Invention implementation method, the mechanical architecture enables expansion and contraction movements in order to vary the overall length of the joint and enable the bed base to:be raised from the lower base,be lowered onto the lower base,be tilted longitudinally on the lower base at the head and foot sections.

[0053] As per the Invention implementation method, and as illustrated in, the extendable mechanical joint segments connected to the bed base on a longitudinal profile (30, 31) are joined to the respective segments connected to the same bed base on the opposite longitudinal profile (32,33) via two interconnection segments (34,35) arranged respectively with a push-pull bracket (36,37) in the shape of an L, and these brackets are fixed such that they do not move on each respective interconnection segment in a non-central position.

[0054] As per the Invention implementation method, the extendable mechanical joint segments connected to the lower base on a longitudinal profile (40, 41) are joined to the respective segments connected to the same lower base on the opposite longitudinal profile (42, 43) via four lower interconnection segments (44, 45, 46, 47), two of which (44, 47) are arranged respectively with a push-pull bracket (48,49) in the shape of an L, and these brackets are fixed such that they do not move on each respective interconnection segment in a non-central position.

[0055] Therefore as per the Invention implementation method, each set of two extendable mechanical joints connected by the respective lower and upper rigid interconnection segments are constrained when expanding and contracting to an identical, symmetrical movement, thanks to the respective rigid interconnection segments, thereby preventing the bed base from tilting in a crosswise direction, which could tip the patient from the right or left side of the bed.

[0056] As per the Invention implementation method, this mechanical architecture for moving the bed base on the lower base and the extendable mechanical joints enable the Invention to have the following features and freedom of movement:to raise and lower the bed base parallel to the lower base and therefore the floor, when both sets of the two extendable mechanical joints move in unison,to raise and lower the bed base such that it is not parallel to the lower base (50) or floor, or raise and lower the bed base foot and head sections in a longitudinal direction, when both sets of the two extendable mechanical joints are not moving in unison or are at different velocities, and therefore have different positions.to have considerable mechanical stability in general, as the entire lifting mechanism is perfectly symmetrical between the bed base (100) and the lower base (101) and between the head section (102) and the foot section (103), enabling high precision during operation and the optimal distribution and balancing of thrusting forces on the respective mechanical parts forming the Invention.

[0057] As per the Invention implementation method,clearly shows one of the technical details in the Invention that enables it to place the bed base at a low height with respect to the floor. This is possible because the crosswise beams forming the lower base (60, 61), which house the rotating joints on the apices of the lower segments of the extendable mechanical parts, are positioned beneath the lower base itself (63) i.e. in the space created by the height of the castors and the castor pegs secured to that base, defined as the floor clearance (62).

[0058] Minimum floor clearance created by the four angular castors (64) is essential for the lower base to move on the floor, and therefore the entire Invention. The floor clearance can be used appropriately to house part of the bed base raising and lowering mechanism, especially when the bed base is at the lowest level from the floor.

[0059] As per the Invention implementation method, the use of the floor clearance space in the Invention by the bed base raising and lowering mechanism enables the bed base to descend to a minimum height off the floor, offering a clear technical benefit with respect to the bariatric beds available in the prior art. The innovation in this Invention actually enables the bed base to be positioned at a height of approximately twenty cm from the floor.

[0060] As per the Invention implementation method, and as described in the subsequent sections, the electric actuators for axial and expanding motion to enable the movement of the Invention and part of the extendable mechanical elements occupy some of the floor clearance space, thereby contributing to a reduction in the minimum height of the bed base from the floor.

[0061] As per the Invention implementation method, all movement in the Invention occurs using electric actuators for axial and expanding motion, as illustrated in (12,13,14,15).

[0062] As per the Invention implementation method, and as illustrated in, these actuators convert electrical energy via an electric motor (70) to create the reversible axial motion of a piston (71), which enables its total length to vary.

[0063] As per the Invention implementation method, four actuators are used, two connected to the extendable mechanical joints at the head section of the Invention, and two connected to the extendable mechanical joints at the foot section of the Invention, creating a structure which overall is mechanically symmetrical and balanced, and able to distribute the thrusting forces generated by moving the bed base evenly and in a balanced manner.

[0064] As per the Invention implementation method, two electric actuators for axial and expanding motion on the lower base are connected to the respective rigid crosswise segment situated at the mid-section (80), which is also joined to the same base beneath its longitudinal beams (804) i.e. in a position occupying the floor clearance space of the Invention.

[0065] As per the Invention implementation method, the offset of the rigid crosswise segment, which extends beneath the lower base, enables the creation of an actuator anchoring area which, similar to the connection of the extendable mechanical elements, occupies the floor clearance space in the Invention, thereby contributing to the reduction in the minimum height of the bed base when positioned at the minimum height from the floor. This is enabled by the fact that all of the aforementioned lifting and lowering mechanical parts in the Invention are housed and moved outside the space established between the lower base and the bed base.

[0066] As per the Invention implementation method, the technique for connecting the actuators to the lower base and bed base is outlined below:two electric actuators for axial and expanding motion (81, 82) are connected to the lower base, with the aforementioned initial apices joined to the rigid crosswise segment (80) and connected using rotating joints (85).the two push-pull brackets joined to the lower rigid interconnection segments of the extendable mechanical elements (801, 802) are connected respectively to the remaining free apices of the two electric actuators for axial and expanding motion connected to the lower base, with the aforementioned apices of the actuators connected using rotating joints (803),the first two apices of another two electric actuators for axial and expanding motion (83, 84) are connected to the bed base, with the aforementioned initial apices joined to the respective rigid crosswise segment (86) and connected using rotating joints (87),the two push-pull brackets joined to the upper rigid interconnection segments of the extendable mechanical elements (88, 89) are connected respectively to the remaining free apices of the two electric actuators for axial and expanding motion connected to the bed base, with the aforementioned apices of the actuators connected using rotating joints (800),

[0067] illustrates the innovative idea in the Invention at the minimum height from the floor that can be reached by the bed base. The mechanisms consisting of the extendable mechanical joints (90,91) and the electric actuators for axial and expanding motion (92,93) are evident, and partially occupy the floor clearance space in the Invention, thereby enabling the bed base to reach a height of just twenty cm from the floor approximately.

[0068] As per the Invention implementation method, the lifting mechanism i.e. the ensemble of extendable mechanical joints and actuators, has a perfectly symmetrical mechanical arrangement whereby:the thrusting forces are evenly distributed over the entire mechanical structure,the mechanical balance enables the high precision and strength of the Invention, even when subjected to loads of greater than 600 kg for long periods of time and under conditions of heavy use.

[0069] As per the Invention implementation method, the lifting mechanism does not move freely other than to rotate around an axis via rotating joints, thereby increasing the stability of the Invention, even when moved in an extended position on the respective castors and with high loads.

[0070] As per the Invention implementation method:the synchronised operation of the four electric actuators at the same speed raises or lowers the bed base parallel to the lower base,the synchronised operation of solely the two actuators at the head or foot section at the same speed tilts the bed base with respect to the lower base along the longitudinal axis (50) i.e. the bed base adopts a position that is not parallel to the lower base,the simultaneous operation of the two actuators at the head section, at a different speed to those at the foot section, raises or lowers the bed base relative to the lower base while gradually tilting the bed base with respect to the lower base.

[0071] As per the Invention implementation method, one or more rotating joints in the Invention have a set of two electromechanical devices i.e. slip rings that transmit electrical signals and / or power, and an encoder and / or resolver to measure the absolute and relative angle of rotation of these joints. The slip rings transmit electrical signals in the rotating joints, preventing cables from breaking when bent continuously; the encoder / resolver measures the absolute or relative angle of rotation of a joint.

[0072] As per the Invention implementation method, the use of these devices is required as one of the essential techniques in the Invention is the ability of the bed base to move on the lower base, when parallel and not parallel to the floor i.e. with the head or foot section tilted.

[0073] As per the Invention implementation method, one or more accelerometers are installed to monitor all movements of the equipment in general in the Invention, and check for unwanted accelerations due to incorrect movements, collisions, malfunctions etc.

[0074] As per the Invention implementation method, additional sensors are fitted to the Invention, such as:a load cell,a GPS sensor,one or more temperature and air humidity sensors,one or more ambient microphones,one or more loudspeakers / buzzers.

[0075] The aim of these sensors is to analyse the environment in which the Invention is placed, to provide data for the control logic to flag potential alerts.

[0076] As per the Invention implementation method, the Invention also has one or more rechargeable backup batteries to enable operation in the event of a power failure.

[0077] As per the Invention implementation method, all electrically-powered equipment in the Invention is connected using suitable electric cable positioned on the mechanical frame of the Invention.

[0078] As per the Invention implementation method, control, monitoring and user interface logic has one or more microprocessors with internal and external memory modules whose overall circuit is configured with the following:a unit to convert power from the mains or a battery to supply each electrical circuit in the Invention, such as a switching unit, with the aforementioned unit consisting of a battery charging circuit connected to the rechargeable battery,a set of electrical interfaces for controlling the motors of the electric actuators for axial and expanding movement,an interface for reading sensor devices such as accelerometers, GPS etc.,an interface for one or more data entry devices, including touch devices, to move the bed base of the Invention and / or program movement times, monitor function status, detect alerts, with at least one data entry device used by the patient,a two-way data communication interface, including a cabled LAN, WLAN and Bluetooth solution for accessing one or more elements of network infrastructure from which:the operation of the Invention can be monitored remotely,the functions of the Invention can be controlled remotely.a wireless communication interface to 3G / 4G / 5G network infrastructure for the same operations specified in section (e),one or more USB communication ports.

[0079] As per the Invention implementation method, the microprocessor control logic in the Invention executes one or more programs residing in external or internal memory specifically devised to perform the following:provide a network server and / or a user terminal, local or connected to the network, with a suitable interface for programming the movements of the bed base in the Invention,provide a network server and / or a user terminal, local or connected to the network, with monitoring and control operations regarding the operation of the Invention,provide a network server and / or a user terminal, local or connected to the network, with advanced programming and self-diagnosis functions, software / firmware upgrades i.e. functions not actionable by the average operator.

[0080] As per the Invention implementation method, various basic self-executing software functions are devised to execute in the background in the control logic in relation to the measurement of parameters of potential risk to the patient, such as:a maximum and minimum threshold of weight variation measured by the load cell in relation to a timeframe, which may flag an alert on the data entry interface and / or on the network and / or an audible alarm. This type of alarm is sent on the presumption that the patient is trying to move inappropriately on the bed base or is agitated,the presence of suspicious environmental noise, which may flag an alert on the data entry interface and / or on the network and / or an audible alarm. This type of alert is sent due to the microphone registering shouts or noise that could relate to a fall from the bed base and / or a request for assistance and / or events relating to a general hazard.the absence of load cell measurements, which may flag an alert on the data entry interface and / or on the network and / or an audible alarm. This type of alert is sent on the presumption that the patient has fallen from the bed base and / or moved away from the bariatric bed inappropriately, which may also combine with the measurement in section a).the detection of unauthorised movement of the Invention from an authorised site, which may flag an alert on the data entry interface and / or on the network and / or an audible alarm. This type of alert is sent on the presumption that an unauthorised user is moving the Invention from its main position, with the motion detected by the GPS sensor,the capture of data showing a series of irregular accelerations, which may flag an alert on the data entry interface and / or on the network and / or an audible alarm. This type of alert is generated from analysing the accelerometer data.the capture of temperature and ambient humidity data, which may flag an alert on the data entry interface and / or on the network and / or an audible alarm. This type of alarm is generated by analysing the data from the temperature and humidity sensor.

[0081] As per the Invention implementation method, the self-executing software functions performed in the background by the control logic can be configured to the patient’s physical and biometric parameters, in addition to the environmental parameters where the bed is installed, such as a hospital room or a specific room in a domestic setting. These parameters are entered via the data entry interface by a qualified operator or by connecting the Invention to the network.Examples

[0082] This description has one of the many mechanical and electrical configurations of the Invention which make it possible to manage a maximum weight of 600 kg on the bed base (Safe Working Load - SWL) and a minimum height of the bed base from the floor of 230 mm.length of segments forming the extendable mechanical joint = 330mm,spacing of the rotating joints fitted to the segments forming the extendable mechanical joint = 290mm,power of the actuators = 10,000 Newton each.

[0083] The industrial application for the Invention is the group of support devices for obese patients in a healthcare or private domestic setting.

[0084] Citation List follows: none.

[0085] US2006085914A

[0086] US2003079289A1

[0087] US2007089238A1

[0088] US975729B2

[0089] https: / www.hillrom.co.uk / en / products / compella-bariatric-bed /

Claims

Bed with variable geometry for hospital or home applications, also for obese and / or bariatric patients, adjustable in height, consisting of a bed base designed to accommodate the patient (21) and a trolley base below the bed base (22) the aforementioned planes constituting in a longitudinal direction a head side (101) and a foot side (102), in which the trolley base is equipped with four ground handling wheels (64) such as to determine a ground clearance (62) given by the distance of the trolley base from the ground floor, the aforementioned bed base and trolley base are joined by a lifting mechanism that allows the bed base to be raised or lowered from the trolley base in which:the bed base (11, 21) and the trolley base (10, 20) are made of two rectangular-shaped metal frames positioned horizontally in relation to the ground, where the longitudinal length is greater than the transverse length; said bases placed vertically one above the other,the transverse beams (24, 25) that make up the trolley base are fixed below the longitudinal beams (26) of the same trolley base, that is in the space delimited by the ground clearance of the bed,the bed base and the trolley base respectively have a stiffening transverse segment (101, 102) joining their respective longitudinal profiles in their median area,the stiffening transverse segment of the trolley base (101,27) is positioned under the longitudinal beams (26) of the same trolley base, that is in the space delimited by the ground clearance of the bed,the bed base and the trolley base are reciprocally connected to the vertices of the lift lifting mechanism made by:four extendable mechanical joints, two on each side, such that the bed base is placed vertically above the trolley base,four electric actuators,the bed base can be tilted along the longitudinal axis (50) among to the trolley plane,the extendable mechanical joint and the electric actuators are characterised by devices that generate mechanical symmetry both in vertical projection between the bed base (100) and the trolley base (101) and in longitudinal projection, between the foot end (102) and the head end (103),the extendable mechanical joint is made up of two metal segments (20a, 21a) united at one of their respective vertices by a rotating junction (22a), the other vertices united respectively at the bed base and at the trolley base by as many rotating junctions (23a, 24a) in which:the connection between the trolley base and the extendable mechanical joint is made by means of a fastening bracket (26a) attached to the transverse beam (25a), which form part of the frame of the trolley base,the connection of the extendable mechanical joints to the bed base is made on the longitudinal profiles of the respective frame (23a),the segments of the extendable mechanical joints linked to the bed base on a longitudinal profile (30,31) are integral to the respective segments connected to the same bed base on the opposite longitudinal profile (32,33) by means of two upper rigid interconnecting segments (34,35) provided respectively with an “L” shaped push and pull bracket (36,37), said brackets installed immovably on each respective interconnecting segment in a non-median position,the segments of the extendable mechanical joints linked to the trolley base on a longitudinal profile (40,41) are integral to the respective segments connected to the same trolley base on the opposite longitudinal profile (42,43) by means of four lower rigid interconnecting segments (44,45,46,47), two of which (44,47) equipped with an “L”- shaped push and pull bracket, said brackets installed immovably on each respective interconnecting segment in a non-median position,the first two vertices of two electric actuators of the axial and extendable type (81,82) are connected to the trolley base, said first vertices integral to the stiffening transverse segment (80) and connected by means of rotating joints (85),the two push and pull brackets integral to the lower rigid interconnecting segments of the extendable mechanical elements (801, 802) are respectively connected to the remaining free vertices of the two electric actuators of the axial and extendable type connected to the trolley base, said vertices of the actuators connected via rotating joints (803),the first two vertices of two further axial and extendable electric actuators (83, 84) are connected to the bed base; said first vertices integral to the respective stiffening transverse segment (86,102) and connected by means of rotating joints (87),the two push and pull brackets integral to the upper rigid interconnecting segments of the extendable elements (88,89) are respectively connected to the remaining free vertices of the two further axial and extendable electric actuators connected to the bed base, said vertices of the actuators connected by means of rotating joints (800).Bed of Claim 1, in which the position of minimum height above the ground of the bed base is obtained by the positioning of the actuators of axial and extendable type (92, 93) and by the extendable mechanical joints (90, 91) in the space bounded by the trolley base to the ground plane, that is in the ground clearance (62).Bed of Claim 1, in which one or more rotating joint are equipped with:a slip ring device,an encoder and / or revolver device.Bed of Claim 1 equipped with one or more rechargeable electric batteries.Bed of Claim 1, equipped with the following sensors:one or more accelerometers,a load cell,a GPS sensor,one or more temperature and air humidity sensors,one or more microphones,one or more loudspeakers / buzzers.Bed of Claim 1 arranged with a logic control and equipped with one or more microprocessors with both internal and external memory whose circuit includes:a device for converting the electric power taken from the mains or battery to supply each circuit of the Invention, even of switching type, said unit comprises a battery charging circuit connected to the rechargeable battery,a plurality of electric interfaces for the control of axial and extendable type electric actuators,a sensors device-communication data interface,an interface for one or more data entry devices, even of touch type, in which at least one data entry device is used by the patient,a bidirectional interface for data communication, both of wired LAN type and of wireless WLAN type and Bluetooth, for access to one or more network telecommunication infrastructures,a wireless communication interface to a network infrastructure 3G / 4G / 5G, also by using a SIM e / o Virtual SIM,one or more USB communication ports.Bed of Claim 1 capable of being programmed and monitored by means of bidirectional data communication from a network infrastructure to which it is connected.Bed of Claim 1 equipped with the following software functions running in background auto execution in the logic control:generation of an alarm by signalling on the data entry interface and / or on the network and / or audible communication resulting from the analysis of the weight parameter detected by the load cell in relation to a time unit,generation of an alarm by signalling on the data entry interface and / or on the network and / or audible communication resulting from the analysis of the load cell data,generation of an alarm by signalling on the data entry interface and / or on the network and / or audible communication resulting from the analysis of data from the microphone,generation of an alarm by signalling on the data entry interface and / or on the network and / or audible communication derived from the analysis of GPS sensor data,generation of an alarm by signalling on the data entry interface and / or on the network and / or audible communication derived from the analysis of accelerometer sensor data.generation of an alarm by signalling on the data entry interface and / or on the network and / or audible communication derived from the analysis of temperature and humidity sensors.

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