EP4146292A2 - Dispositif et procédé de désinfection d'un flux de fluide par exposition à un rayonnement uv-c - Google Patents

Dispositif et procédé de désinfection d'un flux de fluide par exposition à un rayonnement uv-c

Info

Publication number
EP4146292A2
EP4146292A2 EP21729935.3A EP21729935A EP4146292A2 EP 4146292 A2 EP4146292 A2 EP 4146292A2 EP 21729935 A EP21729935 A EP 21729935A EP 4146292 A2 EP4146292 A2 EP 4146292A2
Authority
EP
European Patent Office
Prior art keywords
disinfection
radiation
patient
interface device
ventilator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21729935.3A
Other languages
German (de)
English (en)
Inventor
Andrea Bianco
Alessio ZANUTTA
Edoardo Maria Alberto REDAELLI
Luigi LESSIO
Giovanni PARESCHI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Istituto Nazionale di Astrofisica INAF
Original Assignee
Istituto Nazionale di Astrofisica INAF
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Istituto Nazionale di Astrofisica INAF filed Critical Istituto Nazionale di Astrofisica INAF
Publication of EP4146292A2 publication Critical patent/EP4146292A2/fr
Pending legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/16—Disinfection, sterilisation or deodorisation of air using physical phenomena
    • A61L9/18—Radiation
    • A61L9/20—Ultraviolet radiation
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L2209/00—Aspects relating to disinfection, sterilisation or deodorisation of air
    • A61L2209/10—Apparatus features
    • A61L2209/15—Supporting means, e.g. stands, hooks, holes for hanging
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/06—Respiratory or anaesthetic masks
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/08—Bellows; Connecting tubes ; Water traps; Patient circuits
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/105—Filters
    • A61M16/106—Filters in a path
    • A61M16/1065—Filters in a path in the expiratory path
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2202/00—Special media to be introduced, removed or treated
    • A61M2202/20—Pathogenic agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/05—General characteristics of the apparatus combined with other kinds of therapy
    • A61M2205/051—General characteristics of the apparatus combined with other kinds of therapy with radiation therapy
    • A61M2205/053—General characteristics of the apparatus combined with other kinds of therapy with radiation therapy ultraviolet
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2209/00—Ancillary equipment
    • A61M2209/10—Equipment for cleaning

Definitions

  • the present invention relates to a device and to a method for disinfecting a fluid flow via UV-C radiation.
  • the invention has its preferred forms of application in the disinfection of the air exhaled by a patient subjected to non-invasive assisted breathing and of air flows in ducts of air-conditioning or ventilation systems in general.
  • the treatment of the air coming directly from a patient to whom a respiratory aid has been applied is more critical, for example in confined environments such as an ambulance or a room prepared in emergency regime or also in case of home treatment.
  • the air is not always treated before being re-emitted into the environment and the only solution for avoiding entering into contact with pathogenic germs consists in equipping people with individual protection devices (IPDs). This entails non-negligible risks in case of an incorrect use of the IPDs and for their disposal.
  • IPDs individual protection devices
  • the filters must be changed after a few hours of operation, with considerable management and disposal costs, and with the further difficulty of following strict protocols for maintaining the required level of hygiene.
  • the disinfecting power of UV radiation is well known; however, the UV disinfection systems known for being effective, in particular with wavelengths operating in the so-called UVC band (between 250 and 280 nm), require a dosage of several mJ/cm 2 (variable depending on the microorganism considered) and obtainable by using relatively high power sources and/or a relatively long stay of the air in a confined area subjected to the radiation.
  • the object of the present invention is the manufacturing of a device for the disinfection of a fluid flow that is devoid of the drawbacks of the above specified known devices.
  • Figure 1 is a schematic section of a disinfection device according to the invention
  • Figure 2 is a scheme that illustrates an assisted breathing system provided with a device according to the present invention
  • Figure 3 is a perspective and schematic view of a further embodiment of the device according to the present invention
  • Figure 4 is a schematic section of a further embodiment of a device according to the present invention
  • FIGS. 5a, 5b and 5c are perspective views of further embodiments of the present invention.
  • Figure 6 is a perspective and schematic view of a further embodiment of the device according to the present invention.
  • Figure 7 is a partial section according to the line VII-VII of Figure 6.
  • the device 1 comprises a hollow body 2 provided with an inlet opening 3, an outlet opening 4 and one or more sources 5 of UV-C radiation, having a wavelength preferably between
  • the sources 5 can consist of LEDs.
  • the sources 5 can be powered by a battery 6, suitably built into the device 1.
  • the hollow body 2 has a reflective inner surface 7
  • the term "reflective" is used to indicate a surface or coating having a reflectance of at least 0.8 (i.e. 80%).
  • a reflective coating can be metallic reflective films (with a specular or diffusing surface) deposited under vacuum or using other methods, or reflective films deposited under vacuum with a multi-layered structure containing dielectric materials (for example SiCh) to obtain a high reflectivity in the UV-C region and simultaneously filter other bands and protect the surface with respect to reflectivity losses (for example from oxidation).
  • the hollow body can also consist of a sheet made of metal (for example aluminum), having a reflective inner surface (specular or diffusing), suitably worked so that it assumes the optomechanical configuration of the hollow body 2.
  • the inlet opening 3 and the outlet opening 4 in the illustrated example are arranged at the same axial end (base) of the hollow body 2 in order to maximize the time of stay of the gas inside the device, and thus minimize the dimensions of said device.
  • the volume of contaminated gas has an extremely low absorption, of the order of magnitude of 1%, and thus does not reduce the light intensity by significant amounts.
  • the geometry and the characteristics of the device illustrated by way of example in Figure 1 are: cylinder diameter: 80mm; cylinder height: 80mm; inlet/outlet openings: diameter 22mm; inner coating: aluminum; 2 25mW UV-C LEDs; wavelength: 254 nm.
  • the total light power calculated by means of numerical simulation methods is approximately equal to 268 mW.
  • the exhaled flow passes through the device in approximately 1.6 s: the resulting illumination dosage is equal to 6.7 mJ/cm 2 , which is sufficient for the disinfection of the gas with respect to the presence of viruses similar, for example, to SARS-COV- 2, based on recent published estimates.
  • a similar result can be obtained with a row of six SMD LEDs having a power of 9mW. This yields a total light power of 280 mJ corresponding to a dosage of 7 mJ/cm 2 . With an opaque or transparent hollow body under the same conditions, a dosage of 0.54 mJ/cm 2 would be obtained, which is not sufficient for the complete inactivation of the pathogenic agents present in the flow.
  • reference numeral 11 indicates, as a whole, a non-invasive assisted ventilation system.
  • the system essentially comprises, in a known manner: a ventilator device 12, having the purpose of producing an air flow or possibly a gaseous mixture of air enriched with oxygen (in the following, for the sake of brevity,
  • the gas the gas
  • a gas-conditioning device 13 having the purpose of controlling the temperature and humidity of the gas
  • an interface device 14 having the purpose of conveying the gas to the patient's external respiratory airways.
  • the interface device 14 can consist of a simple mask, a nasal tube, a face mask, or a helmet. The type of interface essentially depends on the administered air flow.
  • the exhaled air is re emitted into the environment through holes 15 in said mask.
  • the air is made to pass through a disinfection device 1 manufactured according to the invention .
  • the device 1 comprises coupling means coupled to the used interface device which differ depending on the type of such device, as described in the following using identical numbers for identical components or corresponding to components already described.
  • the device 1 can be manufactured having a box- shaped body 2 as illustrated in Figure 3.
  • the body 2 is shaped to adhere along the perimeter of the mask, to which it can be fixed along an open back edge 20 by means of adhesive, Velcro® or a suction-cup system not illustrated.
  • the UV-C source 4 is housed, which preferably extends downwards from an upper wall 21 of said body (in use, in front of the nose of the patient).
  • the body 2 has a lower slot 22 through which the duct for supplying gas to the mask can pass.
  • the body 2 is expediently provided with a front hole 23 through which the disinfected air outflows, and can also comprise possible shields for avoiding light returns towards the patient.
  • Figure 4 illustrates a disinfection device 1 similar to the one described in Figure 1, from which it differs essentially by the fact that the inlet opening 3 and the outlet opening 4 are arranged on axially opposite sides of the body 2.
  • the body 2 consists of a cylindrical barrel 30, inside which the sources 5 are fixed, and of a pair of end flanges 31, 32 fixed at the opposite ends of the barrel 30 and defining the respective openings 3 and 4.
  • the device 1 of Figure 4 further comprises a coupling connector for coupling to the interface device 14 as illustrated in Figure 5a, 5b or 5c.
  • the interface device is a mask 14 provided with an outlet hole 16, as illustrated in Figure 5a
  • the device 1 can comprise a connector 17 connected to the hole 16 and provided with an adhesive terminal flange 18 designed to be fixed around the hole 16.
  • the connector 17 can be elbow (Fig. 5a) or rectilinear (Fig. 5b). Alternatively, the connector 17 can be flexible so as to allow any orientation of the device 1.
  • Figure 5c illustrates a solution wherein the mask 14 comprises a plurality of small-sized holes 19 as outlet opening.
  • the flange 18 must be dimensioned so as to surround said holes.
  • a bag shaped device 1 as illustrated in Figures 6 and 7 can be used.
  • the device 1 comprises, in this case, a substantially rigid top cap 24, provided with an inlet opening 25 provided with a seal 26 designed to be coupled to the outlet duct of the mask.
  • the cap 24 also houses the UVC source 4.
  • a bag-shaped body 2 Fixed to the cap 24 is a bag-shaped body 2 coated internally with a reflecting material. As it is deformable and devoid of a shape of its own, the body 2 reduces the problems of bulk associated with a rigid body.
  • the body 2 is provided with a bottom outlet opening for the air, not illustrated.
  • a bag-shaped device of the aforementioned type can be used also in the case of a mask with holes, replacing the cap 24 with a suitable open interface designed to fit the profile of the mask around the holes of the same.
  • the multiplicative effect of the light intensity due to the reflective coating of the body 2 allows using the disinfection via UV-C radiation in contexts that require a miniaturization and a portability of the system.
  • the direct connection of the disinfection device to the interface device that interfaces with the patient allows simplifying the apparatus and preventing modifications to existing apparatuses .

Landscapes

  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Apparatus For Disinfection Or Sterilisation (AREA)

Abstract

L'invention concerne un dispositif de désinfection d'un volume contenant un fluide gazeux, comprenant un corps creux (2) comportant une surface interne réfléchissante (7), une ouverture d'entrée (3) et une ouverture de sortie (4), et une ou plusieurs sources (5) de rayonnement UV-C placées à l'intérieur du corps (2) ; le corps (2) délimitant une cavité optique générant un effet multiplicateur de l'intensité d'éclairage en raison de multiples réflexions à l'intérieur du corps (2). Le dispositif peut être utilisé dans des systèmes de respiration ou de ventilation assistés pour désinfecter l'air expiré par un patient.
EP21729935.3A 2020-05-08 2021-05-07 Dispositif et procédé de désinfection d'un flux de fluide par exposition à un rayonnement uv-c Pending EP4146292A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT202000010378 2020-05-08
PCT/IB2021/053905 WO2021224879A2 (fr) 2020-05-08 2021-05-07 Dispositif et procédé de désinfection d'un flux de fluide par exposition à un rayonnement uv-c

Publications (1)

Publication Number Publication Date
EP4146292A2 true EP4146292A2 (fr) 2023-03-15

Family

ID=72266608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21729935.3A Pending EP4146292A2 (fr) 2020-05-08 2021-05-07 Dispositif et procédé de désinfection d'un flux de fluide par exposition à un rayonnement uv-c

Country Status (2)

Country Link
EP (1) EP4146292A2 (fr)
WO (1) WO2021224879A2 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5165395A (en) * 1992-02-14 1992-11-24 Ricci Mark R Ultra-violet germicidal mask system
WO2006119515A1 (fr) * 2005-04-29 2006-11-09 Pawel Wisniewski Equipement respiratoire
US20070101867A1 (en) * 2005-11-08 2007-05-10 Hunter Charles E Air sterilization apparatus
GB0706507D0 (en) * 2007-04-03 2007-05-09 Medi Immune Ltd Protective device
US20120285459A1 (en) * 2010-01-15 2012-11-15 Yasuhiko Sata Air disinfection and cleaning device, and exhaled gas disinfection and cleaning device, interior air disinfection and cleaning device, and simplified isolation device using the same
CN205814823U (zh) * 2016-06-17 2016-12-21 马攀峰 一种可持续消毒的呼吸机无菌空气管路

Also Published As

Publication number Publication date
WO2021224879A2 (fr) 2021-11-11
WO2021224879A3 (fr) 2021-12-16

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