Medical ventilator protected against electrostatic discharge

Abstract

Title of the Invention: Electrostatic Discharge Protected Medical Ventilator. The invention relates to a medical ventilator (1) comprising an internal metal frame (2) with a first electronic board (3) comprising first grounding means (3.1) electrically connected (30) to said frame (2); a support arm (10) fixed to the frame (2) and carrying a monitor (20) with a display screen (28) comprising a second electronic board (21) comprising second grounding means (21.1). The monitor (20) comprises an internal metal casing (22) electrically connected (32) to the second grounding means (21.1) of the second electronic board (21), and also to the first grounding means (3.1) of the first electronic board (3). Abstract Figure: Figure 2

Description

Title of the invention: Medical ventilator protected against electrostatic discharge

[0001] The invention relates to a medical ventilator equipped with a monitor displaying information or other information, arranged in an orientable manner on a support arm forming a gantry, which monitor and / or display screen are protected against untimely electrostatic discharges.

[0002] A medical ventilator is a respiratory support device used to deliver respiratory assistance, that is, artificial ventilation, to a patient (or patients) suffering from respiratory disorders or insufficiency, of varying severity, which may result from different pathologies or similar conditions. Some patients with severe pathologies may remain ventilated in a hospital setting for several days, or even several months, as during the COVID-19 pandemic.

[0003] During its operation, the medical ventilator delivers a breathing gas to the patient, for example air or oxygen-enriched air, and operates a follow-up, i.e. monitoring, of ventilatory parameters, e.g. gas pressure, esophageal pressure, volumes of gas exchanged, gas flow rate... The breathing gas can be delivered by a motorized blower, also called a turbine, pump, compressor or similar.

[0004] Ventilatory parameters are generally displayed on a display screen of a graphical user interface (GUI), also called a human-machine interface (HMI), of the medical ventilator in the form of curves, data, information, icons or other... The HMI also includes means of selection or adjustment, such as touch keys, allowing healthcare personnel to make selections, adjustments or other.

[0005] The operation of the fan, in particular that of the motorized blower, the displays on the display screen of the HMI... are controlled and driven by control means, typically one (or more) microprocessor-based electronic board(s).

[0006] As taught by EP4043776 or EP4044776, the display screen can be integrated into a swiveling monitor carried by a support arm surmounting the casing of the medical ventilator.

[0007] In practice, it sometimes happens that the ventilator, particularly the monitor, is subjected to unexpected electrostatic discharges, typically electrostatic discharges generated by contact with the clothing of healthcare personnel in hospital settings. Such electrostatic discharges are particularly harmful because they can lead to malfunctions of the medical ventilator and / or damage to sensitive electronic components. including those present in the monitor, typically the electronic board managing the displays.

[0008] A problem is therefore to be able to ensure that electrostatic discharges applied to the device, in particular at the level of the display screen monitor, do not lead to malfunctions, such as ventilation stops or untimely restarts of the fan, and furthermore do not damage sensitive internal components, in particular those present on the electronic board(s) of the monitor used for the display.

[0009] One solution of the invention relates to a medical ventilator, that is to say a respiratory assistance device, used to supply a respiratory gas to a patient, i.e. a person in need of it, comprising an internal metal frame carrying a first electronic board including first means of grounding electrically connected to said frame; a support arm carried by the metal frame; and a display screen monitor carried by the support arm including a second electronic board including second means of grounding.

[0010] Furthermore, in the medical ventilator, the monitor includes an internal metal casing; the second grounding means of the second electronic board are electrically connected to the internal metal casing; and the internal metal casing is electrically connected to the first grounding means of the first electronic board.

[0011] Generally, according to the invention, electrical continuity (i.e., ground connection) is ensured between the monitor, the fan and the electrical network, i.e., the ground connection, so that electrostatic discharges applied to the display monitor can simply flow through the monitor, the fan body and the ground connection, and therefore cannot damage sensitive components and / or cause the fan to malfunction.

[0012] Depending on the embodiment considered, the fan of the invention may comprise one or more of the following features: - the internal metal frame is arranged in a peripheral casing made of insulating material. - the insulating material is polycarbinate / acylonitrile butadiene styrene or ABS / PC which has good impact resistance. - The display screen monitor includes an insulating outer casing. - the internal metal casing is arranged within the external casing of the monitor. - the first means of grounding the first electronic circuit board include a first mass layer. - the second means of connecting to the ground of the second electronic board include a second ground layer. The monitor is attached to the support arm by means of an external plate and an internal plate sandwiching a rear wall of the external shell of the display screen monitor. said plates are fixed to each other by means of retaining. Preferably, the means of retention include screw-in elements passing through the rear wall of the external shell of the display screen monitor, for example screws or the like. The external plate is electrically connected to the internal plate by means of the retaining devices. the means of support are made of electrically conductive material. The means of retention include metallic screw elements, such as metal screws, such as stainless steel or other. The internal circuit board is electrically connected to the internal metal casing, preferably via an electrically conductive foam element. the internal metal casing is electrically connected to the second means of grounding the second electronic board by a conductive spring blade, preferably made of stainless steel alloy or any other suitable metal. It also includes a motorized turbine, also called a pump, compressor, blower or similar, to supply a breathing gas. it further comprises at least one gas passage forming a gas path supplied with gas by said turbine. The motorized turbine and / or the gas passage(s) are arranged on the internal metal frame. It also includes means of electrical connection to the mains, including an earth connection electrically connected to the chassis. The means of electrical connection to the sector further include a phase connection (+) and a neutral connection (-). the internal metal casing is electrically connected to the first means of grounding of the first electronic board by a connecting cable including an electrical ground connection, preferably an HDMI cable. the connecting cable includes one or more strands dedicated to grounding. The connecting cable includes a first connecting end intended to connect to a connector on the first electronic board, i.e. to the first ground layer, also called the "first ground plane". The connecting cable includes a second connecting end designed to be connected to a connector on the second electronic board. that is to say, the second mass layer, also called the "second mass plane". - the connecting cable is an HDMI cable including HDMI connectors at its ends. - the connector of the first electronic board and / or the connector of the second electronic board is / are HDMI connectors configured to be connected to the HDMI connectors of the HDMI cable. - A ground layer or plane comprises a conductive metallic area, typically a copper area, connected to ground arranged on a printed circuit board, i.e., an electronic board. The copper area, i.e., the copper area, can vary in size, for example, covering all or part of the electronic board, particularly in multilayer designs.

[0013] Depending on the embodiment considered, the medical ventilator of the invention may also include one or more of the following additional features: - the turbine is configured to supply a breathing gas, such as air or an air / oxygen mixture, or even pure oxygen. - the turbine is motorized, that is to say it includes an electric motor. - it includes control systems. - the fan control means include the first electronic board. - the control means control the motorized turbine, in particular the accelerations and / or decelerations or braking of the electric motor. - the control systems are arranged on the support chassis. - the support chassis is formed of a rigid structure, in particular a metallic structure, that is to say in an electrically conductive metal, for example in steel or similar. - the support chassis also carries all or part of the external casing of the fan. - the external casing forms a protective envelope around the fan. - the support arm projects above the support chassis and outside the fan frame, that is to say, forms a bracket extending upwards and arranged above and externally to the frame. - the support arm includes a monitor orientation system with display screen which is arranged between the support arm and the monitor incorporating the display screen. - The orientation system is configured to allow the monitor to be oriented relative to the support arm in several directions, i.e., different directions, typically along at least two axes (X, Y), preferably two perpendicular axes (X, Y) comprising a horizontal axis (XX) and a vertical axis (YY). The support arm forms a gantry or similar structure supporting the monitor incorporating the display screen. The orientation system is attached to a free end of the support arm. the support arm is fixed, i.e. secured, to the support frame. the support frame comprises one or more structural elements forming one or more floors, uprights or similar preferably joined together. The support frame comprises (at least) a floor element forming a base and upright elements surmounting said floor element, which together form a three-dimensional frame structure supporting the motorized turbine, the control means, and other internal components of the medical ventilator, including the battery, one or more gas paths (i.e., passages, ducts, etc.). The monitor incorporating the display screen is attached to the external mounting plate, called the external plate. The external plate is attached to the orientation system carried by the support arm. The external plate includes a plate with holes allowing the passage of screwed elements used for fixing, such as screws or the like. The display screen monitor is fixed to the external mounting plate by screwing. The external carcass is formed of several parts, i.e. several carcass elements, including a base and a hood. The external frame includes a base forming a lower part of the frame and into which the support chassis is housed and secured. The external carcass includes a removable hood forming a detachable upper part of the carcass. The base is attached to the hood in a detachable manner. The casing also includes a small rear cover positioned opposite the internal battery and removable to provide access to the battery. The small rear cover is screwed onto the chassis. One or more handling handles arranged on the monitor allow the monitor to be manipulated and oriented with a display screen. The two handles are arranged on either side of the monitor screen. The support arm is protected by a peripheral protective shell. at least one electrical connection cable is arranged along at least part of the support arm, preferably within the arm's casing, advantageously at least one (or more) cable electrically connects the second electronic board of the display screen monitor to the fan control means, in particular to the first electronic board. The peripheral protective shell of the support arm and the fan casing are made of polymer, for example ABS / PC. The first and second electronic boards include one or more microprocessors. The microprocessor(s) implement one or more algorithms. It further includes a gas circuit fluidly connected to the turbine so as to convey the gas supplied by said turbine, such as one or more conduits, passages or the like for the gas, and preferably one or more valves, in particular solenoid valves. The display screen is configured to allow the display of information, graphs, selection or adjustment keys, icons, alarms, or other things. It includes one or more user-operable adjustment or selection buttons or keys, which may be arranged on the monitor and / or on the fan itself. The display screen is touch-sensitive; preferably it includes one or more touch keys, i.e. virtual keys, displayed on the display screen. The display monitor is mounted on top of the fan casing when it is in its normal operating position, i.e. with the base placed on and / or facing a support surface, such as a hospital trolley, a piece of furniture, the floor or other. The control systems are also configured to control the displays on the screen. It also includes means for supplying electrical current. The means of supplying electrical current are electrically connected (directly or indirectly) to the electronic board, the display screen, the blower and more generally to all the elements or components of the fan requiring electrical current to operate. The means of supplying electrical power include a rechargeable battery. The means of supplying electrical current include means of electrical connection to the mains (110 / 220 V), i.e. electrical connection, including an earth connection, a phase (+) connection and a neutral (-) connection, in particular one or more electrical cables and / or one or more electrical sockets. - the support chassis advantageously carries one or more cooling fans used to circulate air in the casing in order to cool the electronic board(s), or even other internal components of the fan. - the chassis preferably also carries an electronic power supply board used to convert the mains voltage (110 / 220V) into an appropriate supply voltage compatible with the electronic and other components of the fan. - the turbine delivers gas at least during the patient's inspiratory phases. - The display screen includes one or more touch keys allowing selections, validations, adjustments, start or stop operation... The touch keys are digitally actuation, that is to say they are activated when the user presses them with their finger, typically their index finger. - The display screen is configured to operate a display of information in the form of alphanumeric characters, graphic representations (e.g. graphs, curves, drawings, icons, etc.), photos, video animations... or other. - the turbine includes an electric motor driving a bladed wheel arranged in the internal compartment of a volute. - the turbine is controlled to reach a rotational speed of up to 25,000 rpm, typically between 500 and 15,000 rpm, for example on the order of 9,500 rpm maximum.

[0014] The invention will now be better understood with reference to the following detailed description, given by way of illustration but not limitation, with reference to the accompanying figures, among which:

[0015] [Fig-1] schematically illustrates an embodiment of a medical ventilator according to the invention.

[0016] [Fig.2] schematically illustrates one embodiment of the internal architecture of the fan [Fig.1], shown without its peripheral carcasses and shells.

[0017] [Fig.3] shows schematic diagrams of the internal electrical connections of the fan and monitor used to dissipate any electrostatic discharges according to the invention.

[0018] [Fig.4] schematically shows the attachment of the monitor to the support arm and the connections electrical devices used to dissipate any electrostatic discharges according to the invention.

[0019] [Fig. 1] and [Fig. 2] schematically illustrate an embodiment of a medical ventilator 1, that is to say a respiratory support device, according to the invention, which is designed to to provide a respiratory gas to a patient, i.e. a medical gas, for example air, oxygen, or oxygen-enriched air.

[0020] The medical ventilator 1 comprises a rigid peripheral casing 4, for example made of polymer, such as ABS / PC, surrounding an internal metallic frame 2, i.e. made of an electrically conductive material, such as steel, on which are arranged at least some of the various elements enabling the operation of the ventilator 1, in particular a motorized blower (not visible), also called a turbine or compressor, delivering the breathing gas, an internal gas circuit (i.e., gas ducts or passages, valves, etc.) for conveying the gas flows, microprocessor-based control means, in particular the first electronic board 3...

[0021] The carcass 4 can be formed of several subunits that come together, for example a base surmounted by a removable cover forming the upper part of the carcass.

[0022] In operation, ambient air is drawn in and preferably filtered by the motorized turbine via an inlet port in fluidic communication with the ambient atmosphere. The motorized turbine has a conventional architecture, as described by EP2947328. It comprises one (or more) impeller driven in rotation by the rotating shaft of an electric motor. The impeller is arranged, free to rotate, within an impeller compartment arranged in a volute, preferably sandwiched between a lower and an upper half-volute sealed together. The volute includes an inlet for air from the air inlet port, i.e., the air drawn in by the impeller during its rotations when driven by the motor.Furthermore, the turbine volute includes a gas outlet duct through which the gas flow is expelled from the volute, during the rotations of the impeller, and delivered to the patient via a flexible gas duct opening at a patient respiratory interface, such as a breathing mask or tracheal tube.

[0023] The operation of the turbine, in particular the accelerations or decelerations / braking of the engine, is controlled by control means, also called electronic control unit, typically one (or more) microprocessor electronic card(s), for example the first electronic card 3, so as to supply the breathing gas at the desired flow rate and pressure.

[0024] Of course, the fan 1 may include other operating elements, such as one or more pressure and / or flow sensors (e.g., mass flow sensor and / or hot-wire sensor) to measure the gas pressure and / or the flow rate of the gas stream in the internal gas circuit. The pressure and / or flow measurements (i.e., signals) are transmitted by the sensors to the fan 1 control means, in order to control the turbine.

[0025] The means for controlling the ventilator 1 include one or more microprocessors arranged on one or more electronic boards, in particular the first electronic board 3, advantageously a microcontroller, implementing one or more algorithms, enabling in particular to monitor and regulate the ventilation delivered to the patient by exploiting in particular the pressure and flow signals measured by the pressure and / or flow sensors.

[0026] The electronic card(s) may also include storage means for storing, in particular, pressure and / or flow values, for example a flash memory or other type carried by the electronic card, or in any other storage means, including in a microprocessor algorithm.

[0027] Furthermore, the fan 1 also includes a support arm 10 carried by the internal metal frame 2, for example fixed by screwing, as seen in [Fig.1] and [Fig.2], i.e. forming a mast or a gantry projecting above the casing 4 of the fan 1. The support arm 10 includes an internal metal structure 10.1 fixed to the frame 2, which is surrounded by a peripheral protective shell 10.2, for example made of polymer, forming a sleeve around the internal metal structure 10.1 of the support arm 10.

[0028] The support arm 10 carries, at its upper end, a monitor 20 with a display screen 28 incorporating a second electronic board 21 used in particular to control the displays.

[0029] Furthermore, the monitor 20 includes an internal metal casing 22, illustrated in [Fig. 3] and [Fig. 4], typically formed from a sheet of, for example, galvanized steel or aluminum alloy. The casing 22 acts as mechanical protection for the screen. It is electrically isolated from the internal components of the monitor 20.

[0030] To allow the monitor 20 with display screen 28 to be oriented, an orientation system 11 is arranged between the support arm 10 and the monitor 20 so as to be able to orient and / or position the display screen 28 in space and allow healthcare personnel to clearly distinguish the information displayed on it. Preferably, the orientation system 11 is orientable along several axes relative to the support arm 10, typically at least two perpendicular axes (X, Y), namely here a horizontal axis (XX) and a vertical axis (YY).

[0031] The support arm 10 is attached to the monitor 20 by means of two mounting plates, namely an outer plate 24 and an inner plate 25, connected to each other by screw-in elements 26, such as screws or the like, passing through the rear wall 23.1 of the outer casing 23 of the monitor 20, as illustrated in [Fig. 4] and detailed below. The inner plate 25 and the outer plate 24 typically comprise or are plates 12 with holes 13 for the passage of the screw-in elements 26.

[0032] As already stated, the support arm 10, in particular its internal metal structure 10.1, is fixed to the internal support frame 2 of the fan 1 which is arranged inside the peripheral casing 4 of the fan 1. The support arm 10 projects above the support frame 2 and protrudes outside and above the casing 4 of the fan 1 so that the monitor 20 and the screen 28 are located above the casing 4. The orientation and manipulation of the monitor 20 is done via two lateral handles 29, for example in the form of arcs or otherwise, arranged on either side of the screen 28, as illustrated in [Fig.1].

[0033] Furthermore, the support chassis 2 also serves as a support for other elements or components of the fan 1, such as the control means, typically the first electronic board 3, the motorized blower, a battery, the ducts or gas passages forming the internal gas path(s)....

[0034] The support chassis 2 is formed of a rigid metal structure forming a an internal framework or skeleton, for example plates, walls or the like, made of sheet steel or other material. This rigid metal structure comprises one or more structural elements forming one or more floors, uprights or the like, joined together in a three-dimensional structure supporting the internal components of the medical ventilator 1, as illustrated in [Fig.2].

[0035] The support chassis 2 also carries the carcass 4 of the fan 1. For example, the carcass 4 includes a base in which the support chassis 2 is housed and secured, and a removable cover that can be detached to give access to the inside of the fan 1.

[0036] As illustrated in [Fig.2], connecting cables, such as an HMI link 34, are arranged along the internal structure 10.1 of the support arm 10, which in particular connect the control means, such as the first electronic board 3, to the internal components of the monitor 20, in order to supply it with current, to control the displays which operate on the screen 28 or to ensure the ground connections, as explained below.

[0037] Furthermore, the display screen 28 is preferably a touchscreen, and preferably in color, on which, during operation, virtual selection or adjustment buttons are displayed, activated by a user's digital action, i.e., when the user presses them with their index finger, for example. The virtual buttons may be in the form of icons or similar symbols. They allow a user to make selections and / or adjustments, for example, desired pressure levels or other ventilation parameters, to activate and deactivate ventilation options or alarms.

[0038] One or more buttons may be provided, particularly on monitor 20, for making selections, adjustments, etc., and for voluntarily validating configurations...

[0039] Electrical current is typically supplied to the fan 1 by means of an electrical connection to the mains 5 (110 / 220V), such as an electrical connection cable with a mains plug. Preferably, the cable includes a phase (+) connection, a neutral (-) connection, and an earthing connection 5.1, i.e., a grounding connection; for example, the connections are or include one or more conductors or one or more metallic stresses. The fan 1 may also include an internal rechargeable battery and / or, preferably, a power supply board acting as a current / voltage converter. The electrical connection means serve to supply electrical energy to the components of the fan 1 that require it to operate, in particular the blower, the control means, including the electronic board(s) and microprocessor(s), the pressure and / or flow sensors, the display screen 28, and / or other components..

[0040] The medical ventilator 1 also includes an expiratory valve connection for fluidly connecting an expiratory valve, an expiratory valve ejection button, a nebulizer device connection connector, a probe connection connector, a patient circuit connector, an FiO2 probe housing 25 and its sealing cover for storing a probe for measuring the patient's blood O2 level, as well as other elements, including connectors for various connections, as taught by EP4043776.

[0041] In practice, it sometimes happens that the fan 1, in particular its monitor 20, is subjected to unexpected electrostatic discharges, for example, electrostatic discharges generated by contact with the clothing of healthcare personnel in hospital settings. Such electrostatic discharges are particularly harmful because they can lead to malfunctions and damage to sensitive electronic components, especially those in the monitor 20, typically the second electronic board 21 which manages the displays on the screen 28. Furthermore, these electrostatic discharges can also affect a person in the immediate vicinity of the monitor 20 and / or handling it.

[0042] According to the invention, to avoid these problems, in particular to ensure that such electrostatic discharges do not lead to malfunctions of the fan 1, such as ventilation shutdowns or unexpected restarts of the fan 1, or to damage to sensitive internal components, in particular the second electronic board 21 of the monitor 20, electrical continuity, i.e., a ground connection, is ensured between the monitor 20, the fan 1, in particular its internal metallic chassis 2, and the electrical network, i.e., the ground connection, so that the electrostatic discharges applied to the display monitor 20 can simply flow through the monitor 20, from the chassis 2 of fan 1 and of the ground connection, and therefore cannot damage sensitive components and / or cause fan 1 to malfunction.

[0043] To do this, the second means of connecting to ground 21.1 of the second electronic board 21, also called the "screen board", and, on the other hand, the first means of connecting to ground 3.1 of the first electronic board 3, also called the "main board", are electrically connected to the internal metal casing 22 of the monitor 20, as schematically shown in [Fig.3] and [Fig.4].

[0044] The second grounding means 21.1 of the screen card 21 are electrically connected to the internal metal shell 22 by an electrically conductive component 32, for example a stainless steel spring blade or other conductive material, while the first grounding means 3.1 of the main card 3 are electrically connected to the internal metal shell 22 by an electrical link 33, typically by a link cable 34 including an electrical ground link, preferably an HDMI or similar cable.

[0045] Furthermore, the first grounding means 3.1 are connected to the internal metal frame 2 of the fan 1 by direct contact, i.e. a screw connection maintaining in contact the first ground layer, i.e. the first ground plane, of the first grounding means 3.1 and the frame 2, while the frame 2 is itself connected to earth via a ground connection of the power supply socket, as illustrated on [Fig.3], where the electrical connection means to the mains 5 are shown, which include an earth connection 5.1 electrically connected 31 to the metal frame 2 and also a phase (+) connection and a neutral (-) connection.

[0046] More specifically, the first grounding means 3.1, which form a ground plane of the first electronic board 3, i.e. the main board, are electrically connected to an HDMI connector 3.1 carried by the main board 3.

[0047] Cable 34, namely an HDMI cable, one or more strands of which are dedicated to earth, i.e. one or more earth terminals, is therefore connected: - on the one hand, via its first connection end 34.1, to the HDMI 3.1 connector of the first electronic board 3, therefore to the first ground layer 3.1, also called the "first ground plane" and - on the other hand, via its second connection end 34.2, to an HDMI connector (not shown) of the second electronic board 21, so as to ensure electrical continuity (33) between the second electronic board 21 and the first ground layer 3.1.

[0048] The HDMI connector (not shown) of the second electronic board 21 is therefore electrically connected to the second grounding means 21.1, typically to the second ground plane of the second electronic board 21, for example by soldering, while the second ground plane of the second electronic board 21 is itself electrically connected to the internal metal shell 22 of the screen, via the electrically conductive component 32, for example the spring blade.

[0049] The monitor 20 also includes an insulating outer shell 23 within which the internal metal shell 22 is arranged.

[0050] As already stated, the first grounding means 3.1 of the first electronic board 3 comprise a first ground layer 3.1, i.e. a first ground plane, and, similarly, the second grounding means 21.1 of the second electronic board 21 comprise a second ground layer, i.e. a second ground plane.

[0051] Typically, a ground layer or plane on a printed circuit board is generally a copper area connected to ground. This copper area can vary in size, for example, covering only a small area or a larger area extending to the entire board in a multilayer design.

[0052] As can be seen, the monitor 20 is fixed to the support arm 10 by means of an external plate 24 and an internal plate 25 sandwiching a rear wall 23.1 of the external shell 23 of the monitor 20.

[0053] The plates 24, 25 are fixed to each other by means of retaining 26, typically screwed elements, such as metal screws or the like, passing through the rear wall 23.1 of the outer shell 23 of the display screen monitor 20.

[0054] Furthermore, the external plate 24 is electrically connected to the internal plate 25 by means of retaining means 26 made of electrically conductive material, preferably metallic screw elements.

[0055] In addition, the internal plate 25 is electrically connected to the internal metal shell 22, preferably via an electrically conductive foam element 27.

[0056] On [Fig.3], the means of electrical connection to the sector 5 comprising an earth connection 5.1 electrically connected 31 to the chassis and furthermore a phase connection (+) and a neutral connection (-).

[0057] Tests carried out with a fan 1 according to the invention have shown that it resists electrostatic discharges applied at any point of the device, in particular contact discharges at ± 8 kV and discharges in air at ± 15 kV; according to standard IEC 61000-4-2:2008.

[0058] Such electrostatic discharges, when applied to the fan 1 of the invention, do not lead to ventilation stops, nor to unexpected restarts of the device 1 and furthermore do not cause deterioration of the electronic components present on the electronic boards of the device 1.

[0059] A ventilator according to the invention is particularly suitable for use in a hospital setting.

Claims

Demands

1. Medical ventilator (1) comprising: - an internal metal frame (2) carrying a first electronic board (3) including first means for grounding (3.1) electrically connected (30) to said frame (2), - a support arm (10) carried by the metal frame (2) and - a monitor (20) with a display screen (28) carried by the support arm (10), including a second electronic board (21) including second means for grounding (21.1), characterized in that: - the monitor (20) includes an internal metal shell (22), - the second means for grounding (21.1) of the second electronic board (21) are electrically connected (32) to the internal metal shell (22) and - the internal metal shell (22) is electrically connected (33) to the first means for grounding (3.1) of the first electronic board (3).

2. Fan according to claim 1, characterized in that the internal metal frame (2) is arranged in a peripheral casing (4) made of insulating material, preferably the insulating material is made of ABS / PC.

3. Fan according to claim 1, characterized in that the monitor (20) with display screen (28) comprises an insulating outer shell (23), the internal metal shell (22) being arranged in said outer shell (23).

4. Fan according to claim 1, characterized in that: - the first means of grounding (3.1) of the first electronic board (3) comprise a first ground layer, and / or - the second means of grounding (21.1) of the second electronic board (21) comprise a second ground layer.

5. Fan according to claims 1 and 3, characterized in that the monitor (20) is fixed to the support arm (10) by means of an external plate (24) and an internal plate (25) sandwiching a rear wall (23.1) of the external shell (23) of the display screen monitor (20), said plates (24, 25) being fixed to each other by retaining means (26), preferably screwed elements, passing through the rear wall (23.1) of the external shell (23) of the display screen monitor (20).

6. Fan according to claim 5, characterized in that the external plate (24) is electrically connected to the internal plate (25) by said retaining means (26), said retaining means (26) being made of electrically conductive material, preferably metallic screwed elements, such as metal screws.

7. Fan according to claim 6, characterized in that the internal plate (25) is electrically connected to the internal metal shell (22), preferably via an electrically conductive foam element (27).

8. Fan according to claim 1, characterized in that the internal metal shell (22) is electrically connected (32) to the second grounding means (21.1) of the second electronic board (21) by a conductive spring blade, preferably made of stainless steel alloy.

9. Fan according to claim 1, characterized in that it further comprises: - a motorized turbine for supplying a breathing gas and at least one gas passage forming a gas path supplied with gas by said turbine, arranged on the internal metal frame (2), and / or - electrical connection means to the mains (5) comprising an earth connection (5.1) electrically connected (31) to the frame, preferably the electrical connection means to the mains (5) further comprise a phase (+) connection and a neutral (-) connection.

10. A fan according to claim 1, characterized in that the internal metal casing (22) is electrically connected (33) to the first grounding means (3.1) of the first electronic board (3) by a connecting cable (34) including an electrical ground connection, preferably an HDMI cable.

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