US3393626A - Safety arrangements for electrically-operated equipment in surgery or anesthesia rooms - Google Patents

Safety arrangements for electrically-operated equipment in surgery or anesthesia rooms Download PDF

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Publication number
US3393626A
US3393626A US555772A US55577266A US3393626A US 3393626 A US3393626 A US 3393626A US 555772 A US555772 A US 555772A US 55577266 A US55577266 A US 55577266A US 3393626 A US3393626 A US 3393626A
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US
United States
Prior art keywords
equipment
air
surgery
room
zone
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.)
Expired - Lifetime
Application number
US555772A
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English (en)
Inventor
Braun Karl
Streu Benno
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.)
Fritz Hellige und Co GmbH
Original Assignee
Fritz Hellige und Co GmbH
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
Priority to DEH56476A priority Critical patent/DE1254756B/de
Application filed by Fritz Hellige und Co GmbH filed Critical Fritz Hellige und Co GmbH
Priority to US555772A priority patent/US3393626A/en
Priority to FR67692A priority patent/FR1485933A/fr
Priority to NL6609201A priority patent/NL6609201A/xx
Application granted granted Critical
Publication of US3393626A publication Critical patent/US3393626A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/24—Protection against failure of cooling arrangements, e.g. due to loss of cooling medium or due to interruption of the circulation of cooling medium
    • 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
    • A61M16/0087—Environmental safety or protection means, e.g. preventing explosion
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
    • A61N1/00—Electrotherapy; Circuits therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P1/00—Safety devices independent of the control and operation of any machine

Definitions

  • a blower at the base of the inlet tube pressurizes the cabinet containing the equipment.
  • An exhaust tube, coaxial with the inlet tube, exhausts air to the room a substantial distance above the fioor.
  • a pressure sensing device is also provided in the equipment cabinet to prevent energization of the equipment until the required pressure is built up within the cabinet.
  • This invention refers to safety arrangements and techniques for surgery rooms and anesthesia rooms, for example in hospitals, where electrically-operated equipment is employed in the presence of inflammable or explosive anethetic vapors. It is, therefore, an object of the invention to simplify the installation and maintenance of such rooms without sacrificing the high-level safety factor under operating conditions.
  • zones or areas in surgery and anesthesia rooms which normally may be filled with inflammable or explosive vapor-air mixtures and constitute zones of danger, are assumed to include spherical zones with radii of one meter above the head of a patient, or above the equipment to be protected during a surgical operation. Consequently, the zone of danger generally reaches to a height of at least two meters above the floor of the operating room in the vicinity of the anesthetic equipment, and somewhat lower elsewhere in the room.
  • the present invention is based on the officially required provision of a fresh air supply into surgery and anesthesia rooms from or through the ceiling.
  • Such fresh air supply basically consists of a unidirectional, generally vertically downward directed, flow of fresh humidified air effecting a change of air eight to ten times per hour.
  • This fresh air supply it is intended to continuously purge the surgery and/or anesthesia room and the equipment positioned in the zone of danger with fresh air.
  • installation and upkeep of contemporary surgery and anesthesia rooms require significantly higher expenditures.
  • fresh air as supplied to the upper zone of a room in which anesthetic vapors are present, is used for feeding a shielding air flow into electrical equipment operated in the lower zone of the same room.
  • air ducts extending upwardly from, and supported by, the electrical equipment to be shielded, with the ducts being preferably telescoping tubular structures.
  • One of the ducts is the inlet duct which, when extended, reaches into the upper zone of the room filled with fresh air, while another duct may be the outlet, terminating below the fresh air zone.
  • several units of equipment may be operated with a common fresh air supply, with a common outlet duct, or both.
  • the dashed line 10 is assumed to be the boundary between the lower portion 12 of the room, defined as the zone of danger, and the upper portion 14 of the room into which fresh air is continuously introduced by a standard equipment, schematically indicated by a perforated pipe 16.
  • the fresh air supply is built into the ceiling and fed from a central system, as is conventional with contemporary design of hospitals.
  • a patient 18 and surgery equipment 20, 22 are shown disposed within the zone of danger 12. At least one of these equipment units, for example that designated by numeral 20, is provided with a compressor or blower, for example a centrifugal pump 24, having an inlet tubing 26 extending vertically upward and into the upper portion 14 of the room.
  • the blower 24 is driven by a motor 28 and a safety device 30 is provided for inhibiting energization of equipment 20 unless the threshold value of excess pressure has been reached, as is shown in the prior art.
  • the air flow as represented by arrows 32, is forced through the equipment 20 and escapes through an outlet duct 34.
  • the outlet duct preferably does not terminate in the vicinity of the floor 36 of the room, but rather in the upper area, for example at location 38 of equipment 20.
  • the outlet duct 34 may continue upwardly as an outlet tubing 40 concentrically surrounding the inlet tubing 26, but it still terminates within the zone of danger .12, i.e. below boundary 10 and a significant distance below the upper opening of inlet tubing 26.
  • both tubings 26 and 40 are telescoping tubular structures so that they may be retracted to permit easy passage through doors, and for facilitating storage and transportation. Also, when stored away, the inlet and outlet tubings are less cumbersome when in their retracted positions.
  • Additional units of equipment such as that designated 22, which might be required for surgery, may be connected through a length of hose 42 to the equipment including compressor 24.
  • unit 22 may be provided with an individual compressor connected to the main inlet tubing 26. The outlet air from the additional unit 22 of the equipment escapes through hose 44.
  • the present invention eliminates the necessity of providing inlet pipes or hoses for supplying air to blower or compressor 24 by connection to locations outside the surgery room. Were it intended to accomplish this, a multiple cable composed of hoses and pipes would be necessary. Rather, the present invention is based on the fact that fresh air is continuously supplied into the room from above, so that the danger zone does not reach up to the ceiling of the room. Thus, the fresh air constantly at disposal in a zone above the zone of danger in cooperation with the inlet tubing 26 provides the air flow for shielding the equipment.
  • the compressor or blower 24 feeds fresh air into the equipment and, if properly designed, it sustains the required excess pressure of 0.3 torr above the surrounding pressure. Consequently, inflammable vapor-air mixtures are prevented from ignition, as they cannot reach the equipment.
  • the air flow may be permitted to escape through locations of the electrical equipment which are not entirely air-tight, or the equipment may be provided with an appropriate outlet tube of any other design.
  • Each one of the units of electrical equipment operating in the zone of danger may be provided with an individual, upwardly extending inlet tubing 26 for supplying fresh air to its compressor or blower 24.
  • a common inlet tubing may be provided for several compressors or blowers; or a common blower or compressor may be used to supply fresh air to every equipment unit operating in one room.
  • This type of unit is conventionally provided with a tubular supporting structure which may effectively be used as the air inlet tubing.
  • supporting structures of other equipment such as light sources for surgery rooms, may be used as the inlet tubing for blowing air into electrical equipment.
  • hose may connect the common inlet tubing with the individual inlets to the blowers of other equipments.
  • the outlet of the common blower is connected by means of lengths of hose with the interior of the other units to be protected, such as unit 22.
  • hose connections 42 will be required, the expenditure and the inconvenience caused thereby are greatly reduced as compared to an arrangement in which an air duct must be provided from each one of the units to a location outside the room.
  • the equipment unit may be provided with the pair of concentrically arranged tubing sections 26 and 40, described above, with some concentrical space left between one and the other. Then, suitably, the internal tubing section 26 operates as the inlet, while the external tubing section 40 conducts the outlet air upwardly.
  • This external tubing 40 which conducts the outlet air should terminate at a location between fifty centimeters and one meter below the inlet opening of the inlet tubing 26 so that the outlet air is conducted to a location 46 within the upper portion of the zone of danger 12 Without the risk that the outstreaming air disturbs the fresh air intake into the equipment.
  • several units, or several blowers, may be provided with a common outlet tubing.
  • Apparatus for using fresh air supplied to the upper zone of a room wherein anesthetic vapors are present to supply a protective air flow into electrical equipment in the lower zone of the room comprising:
  • an inlet duct in the form of a telescoping tubular structure extending from, and supported by, the electrical equipment;
  • blower means connected to the duct for forcing air from a zone above the equipment through the equipment to thereby cause and maintain the pressure of air forced into the equipment;

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Veterinary Medicine (AREA)
  • Biomedical Technology (AREA)
  • Public Health (AREA)
  • Animal Behavior & Ethology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Emergency Medicine (AREA)
  • Mechanical Engineering (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Environmental Sciences (AREA)
  • Radiology & Medical Imaging (AREA)
  • Pulmonology (AREA)
  • Anesthesiology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Power Engineering (AREA)
  • Ventilation (AREA)
US555772A 1965-07-01 1966-06-07 Safety arrangements for electrically-operated equipment in surgery or anesthesia rooms Expired - Lifetime US3393626A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DEH56476A DE1254756B (de) 1965-07-01 1965-07-01 Verfahren und Vorrichtung zur Fremdbelueftung von Elektrogeraeten in Anaesthesieraeumen
US555772A US3393626A (en) 1965-07-01 1966-06-07 Safety arrangements for electrically-operated equipment in surgery or anesthesia rooms
FR67692A FR1485933A (fr) 1965-07-01 1966-06-30 Procédé et dispositif pour la ventilation des appareils électriques dans les salles d'anesthésie
NL6609201A NL6609201A (de) 1965-07-01 1966-07-01

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEH56476A DE1254756B (de) 1965-07-01 1965-07-01 Verfahren und Vorrichtung zur Fremdbelueftung von Elektrogeraeten in Anaesthesieraeumen
US555772A US3393626A (en) 1965-07-01 1966-06-07 Safety arrangements for electrically-operated equipment in surgery or anesthesia rooms

Publications (1)

Publication Number Publication Date
US3393626A true US3393626A (en) 1968-07-23

Family

ID=25980325

Family Applications (1)

Application Number Title Priority Date Filing Date
US555772A Expired - Lifetime US3393626A (en) 1965-07-01 1966-06-07 Safety arrangements for electrically-operated equipment in surgery or anesthesia rooms

Country Status (3)

Country Link
US (1) US3393626A (de)
DE (1) DE1254756B (de)
NL (1) NL6609201A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6620038B1 (en) * 1999-10-26 2003-09-16 Daikin Industries, Ltd. Suction and exhaust device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1011497A (en) * 1910-09-08 1911-12-12 Carlisle St John Furnace-chimney and ventilator.
US2960924A (en) * 1957-11-14 1960-11-22 Frank S Grott Air distributing conduit system for portable air conditioners
US3173353A (en) * 1962-05-07 1965-03-16 Raymond H Watkins Heat retrieving device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1011497A (en) * 1910-09-08 1911-12-12 Carlisle St John Furnace-chimney and ventilator.
US2960924A (en) * 1957-11-14 1960-11-22 Frank S Grott Air distributing conduit system for portable air conditioners
US3173353A (en) * 1962-05-07 1965-03-16 Raymond H Watkins Heat retrieving device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6620038B1 (en) * 1999-10-26 2003-09-16 Daikin Industries, Ltd. Suction and exhaust device

Also Published As

Publication number Publication date
NL6609201A (de) 1967-01-02
DE1254756B (de) 1967-11-23

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