US-12616811-B2 - Emergency ventilator with a fan which is cooled in a conductive and convective manner

US12616811B2US 12616811 B2US12616811 B2US 12616811B2US-12616811-B2

Abstract

An emergency ventilator for artificially ventilating patients in the event of a medical emergency, having: —a housing with an ambient air suction opening and a ventilating gas outlet opening and—a fan which is designed and is arranged in the housing so as to convey ambient air from the ambient air suction opening to the ventilating gas outlet opening, wherein the fan includes a fan housing with an air conveyor which can be moved relative to the fan housing, and the fan housing is arranged in the housing in a fixed manner thereto; the fan housing is secured to the housing with the interposition of a heat conducting body, the heat conducting body including or being made of a material which is selected from light metal, nonferrous metal, and/or a plastic filled with a heat-conductive filler material.

Inventors

Daniel Hepting
Jan Hunger

Assignees

HAMILTON MEDICAL AG

Dates

Publication Date: 20260505
Application Date: 20210706
Priority Date: 20200713

Claims (20)

1 . An emergency ventilator for emergency medicine artificial respiration of patients, comprising: a housing with an ambient air aspiration aperture and a respiratory gas output aperture, and a fan which is configured and arranged in the housing in order to convey ambient air from the ambient air aspiration aperture to the respiratory gas output aperture, where the fan comprises a fan housing with an air conveyor movable relative to the fan housing and where the fan housing is arranged housing-tight in the housing; where the fan housing is fixed to the housing with the interposition of a heat-conducting body, where the heat-conducting body comprises a material or is made from a material which is chosen out of light metal, non-ferrous metal, and/or a synthetic filled with heat-conducting filling material, wherein an outer surface of the fan housing is exposed in a section of a flow path from the ambient air aspiration aperture to the respiratory gas output aperture in such a way that during a ventilation operation of the emergency ventilator it can be bathed by respiratory gas conveyed by the fan and wherein a section of the fan housing which houses a drive is connected with the heat-conducting body and a section of the fan housing which exhibits the air conveyor protrudes into the flow path of the respiratory gas from the ambient air aspiration aperture to the respiratory gas output aperture.
2 . The emergency ventilator according to claim 1 , wherein the fan housing is connected rigidly with the heat-conducting body.
3 . The emergency ventilator according to claim 1 , wherein the heat-conducting body is connected rigidly with the housing.
4 . The emergency ventilator according to claim 1 , wherein the heat-conducting body exhibits at least one duct routed in the heat-conducting body which forms at least one part of a flow path from the ambient air aspiration aperture to the respiratory gas output aperture in such a way that during the ventilation operation of the emergency ventilator flow through the at least one duct of respiratory gas conveyed by the fan is possible.
5 . The emergency ventilator according to claim 1 , wherein a surface of the heat-conducting body forms a wall of a region enclosing a respiratory gas.
6 . The emergency ventilator according to claim 5 , wherein an outer surface of the fan housing is exposed in a section of a flow path from the ambient air aspiration aperture to the respiratory gas output aperture in such a way that during the ventilation operation of the emergency ventilator it can be bathed by respiratory gas conveyed by the fan; the heat-conducting body surrounding a section of the flow path of the respiratory gas on at least three sides forming a recess where the outer surface of the fan housing which can be bathed by respiratory gas is arranged in the recess formed by the heat-conducting body.
7 . The emergency ventilator according to claim 5 , wherein an outer surface of the fan housing is exposed in a section of a flow path from the ambient air aspiration aperture to the respiratory gas output aperture in such a way that during the ventilation operation of the emergency ventilator it can be bathed by respiratory gas conveyed by the fan; the heat-conducting body surrounding a mixing chamber on four sides forming a recess where the outer surface of the fan housing which can be bathed by respiratory gas is arranged in the recess formed by the heat-conducting body.
8 . The emergency ventilator according to claim 1 , wherein the air conveyor is an air conveyor rotationally movable relative to the fan housing, where at least the outer surface of the fan housing which can be bathed by respiratory gas is an outer surface surrounding a rotational axis of the air conveyor.
9 . The emergency ventilator according to claim 1 , wherein the air conveyor is an air conveyor rotationally movable relative to the fan housing, where at least the outer surface of the fan housing which can be bathed by respiratory gas is an outer surface surrounding a rotational axis of the air conveyor and surrounding completely along a closed path.
10 . The emergency ventilator according to claim 1 , wherein the fan housing comprises a material or is made from a material which is chosen out of light metal, non-ferrous metal, and/or a synthetic filled with heat-conducting filling material.
11 . The emergency ventilator according to claim 1 , wherein the housing comprises a material or is made from a material which is chosen out of light metal, non-ferrous metal, and/or a synthetic filled with heat-conducting filling material.
12 . The emergency ventilator according to claim 1 , wherein the light metal comprises aluminum, magnesium, an aluminum alloy, and/or a magnesium alloy; the non-ferrous metal comprises copper and/or a copper alloy; and the heat-conducting filling material comprises a metal, and/or a ceramic, and/or graphite, and/or carbon.
13 . The emergency ventilator according to claim 12 , wherein the heat-conducting body comprises the material or is made from the material which is the synthetic filled material with the heat-conducting filling material and the heat-conducting filling material comprises carbon nanotubes with a heat conductance of at least 14 W/(mK).
14 . The emergency ventilator according to claim 1 , wherein the heat-conducting body exhibits a fan joint-face which lies opposite a section of the fan housing and exhibits a housing joint-face which faces towards an inner surface of the housing, where the housing joint-face is at least twice as large as the fan joint-face.
15 . The emergency ventilator according to claim 14 , wherein the housing joint-face is at least six times as large as the fan joint-face.
16 . The emergency ventilator according to claim 14 , wherein the housing joint-face is planar.
17 . The emergency ventilator according to claim 1 , wherein the emergency ventilator exhibits a control device which is configured to operate the fan only during inspiratory phases.
18 . An emergency ventilator for emergency medicine artificial respiration of patients, comprising: a housing with an ambient air aspiration aperture and a respiratory gas output aperture, and a fan which is configured and arranged in the housing in order to convey ambient air from the ambient air aspiration aperture to the respiratory gas output aperture, where the fan comprises a fan housing with an air conveyor movable relative to the fan housing and where the fan housing is arranged housing-tight in the housing; where the fan housing is fixed to the housing with the interposition of a heat-conducting body, where the heat-conducting body comprises a material or is made from a material which is chosen out of light metal, non-ferrous metal, and/or a synthetic filled with heat-conducting filling material, wherein a surface of the heat-conducting body forms a wall of a region enclosing a respiratory gas and wherein an outer surface of the fan housing is exposed in a section of a flow path from the ambient air aspiration aperture to the respiratory gas output aperture in such a way that during a ventilation operation of the emergency ventilator it can be bathed by respiratory gas conveyed by the fan; the heat-conducting body surrounding a mixing chamber on four sides forming a recess where the outer surface of the fan housing which can be bathed by respiratory gas is arranged in the recess formed by the heat-conducting body.
19 . An emergency ventilator for emergency medicine artificial respiration of patients, comprising: a housing with an ambient air aspiration aperture and a respiratory gas output aperture, and a fan which is configured and arranged in the housing in order to convey ambient air from the ambient air aspiration aperture to the respiratory gas output aperture, where the fan comprises a fan housing with an air conveyor movable relative to the fan housing and where the fan housing is arranged housing-tight in the housing; where the fan housing is fixed to the housing with the interposition of a heat-conducting body, where the heat-conducting body comprises a material or is made from a material which is chosen out of light metal, non-ferrous metal, and/or a synthetic filled with heat-conducting filling material, wherein the heat-conducting body exhibits a fan joint-face which lies opposite a section of the fan housing and exhibits a housing joint-face which faces towards an inner surface of the housing, where the housing joint-face is at least twice as large as the fan joint-face and wherein the housing joint-face is at least six times as large as the fan joint-face.
20 . The emergency ventilator according to claim 19 , wherein an outer surface of the fan housing is exposed in a section of a flow path from the ambient air aspiration aperture to the respiratory gas output aperture in such a way that during a ventilation operation of the emergency ventilator it can be bathed by respiratory gas conveyed by the fan.

Description

This application claims priority in PCT application PCT/EP2021/068636 filed on Jul. 6, 2021, which claims priority in German Patent Application DE 10 2020 118 466.2 filed on Jul. 13, 2020, which are incorporated by reference herein. The present invention concerns an emergency ventilator for emergency medicine artificial respiration of patients, comprising A housing with an ambient air aspiration aperture and a respiratory gas output aperture, andA fan which is configured and arranged in the housing in order to convey ambient air from the ambient air aspiration aperture to the respiratory gas output aperture, Where the fan comprises a fan housing with an air conveyor movable relative to the fan housing and where the fan housing is arranged housing-tight in the housing. BACKGROUND OF THE INVENTION As such an emergency ventilator there are known the mobile ventilator with the designation ‘EOVE-150 Ventilator’ of EOVE SA in Pau (FR), the mobile ventilator with the designation ‘EVENIN’ of Fritz Stephan GmbH in Gackenbach (DE), and the mobile ventilator with the designation ‘Falco 202 Evo’ of the Italian firm Siare Engineering International Group s. r. l. in Valsamoggia (IT). From EP 3 391 924 A1 there is known a mobile ventilator whose respiratory gas flow is guided as a convective cooling gas flow along a wall of the ventilator with which a storage battery is in contact as an energy store of the ventilator. Thereby, heat of the storage battery should be dissipated away from the respiratory gas flow in order to cool the storage battery and thus make possible shorter charging times. Emergency ventilators, inter alia also referred to as ‘intensive care ventilators’, serve for rapid supply of respiratory gas to a patient outside a clinical environment, i.e. for instance at an accident site and/or during transportation of a patient. Of course, emergency ventilators can also be used in a clinical environment, however in hospitals often more powerful ventilators are available as emergency ventilators. The fan with the fan housing which is static relative to the housing of the emergency ventilator and the air conveyor which is accommodated movably in the fan housing and is moving during a ventilation operation produces, like all devices with components which are mounted on each other and are relatively movable, heat due to friction and due to electric resistance in an electric drive of the air conveyor. An other than electric drive is indeed possible in principle, but on practical grounds is out of the question. From WO 2008/098382 A1 of the present applicant there is known a fan for a ventilator which for mitigating the sound emission is cooled by a heat pipe, less frequently also referred to as ‘Wärmerohr’ in German. SUMMARY OF THE INVENTION It is the task of the present invention to protect the fan as heat source of the emergency ventilator against overheating and to this end as far as possible not increase the weight of the emergency ventilator, such that it remains usable as a portable ventilator without further restriction. The present invention solves this task through an emergency ventilator, as mentioned in the beginning, in which additionally the fan housing is fixed to the housing with the interposition of a heat-conducting body, where the heat-conducting body comprises a material or is made from a material which is chosen out of light metal, non-ferrous metal, and/or a synthetic filled with heat-conducting filling material. Consequently the fan housing can give off heat arising in the fan to the heat-conducting body at least through heat conduction but possibly also through additional physical principles of heat transport such as radiation and convection. The emergency ventilator can transfer the heat transferred from the fan housing to the heat-conducting body via its housing to the external environment of the emergency ventilator. Since in any case the fan has to be arranged housing-tight in the housing of the emergency ventilator, through suitable choice of material of the structure fastening the fan housing heat arising in the fan can be given off to the housing and from there to the environment. An additional cooling structure is consequently not necessary. The structure fastening the fan housing is made in order to ensure its sufficient heat conductance at least in part, preferably completely, from at least one of the mentioned materials. Due to the focus of the structure not only on the fixing of the fan in the housing but also on the dissipation of heat from the fan during the fan's operation and thereafter, the structure of the present application which fastens the fan housing is denoted as ‘heat-conducting body’. ‘Housing-tight’ here does not necessarily mean configured directly at the housing, although this is also comprised by the term ‘housing-tight’. ‘Housing-tight’ means ‘in normal use, not separable and/or not removable respectively from the housing except for any repair purposes’. Out of t