Method of automatically disinfecting door handles of disinfecting units

• US 5,314,668 A
• Filed: 03/19/1993
• Issued: 05/24/1994
• Est. Priority Date: 03/23/1990
• Status: Expired due to Fees

• Current Assignee: BHT Hygienetechnik GmbH (Coltene Holding AG)
• Original Assignee: Stephan Biermaier
• Inventors: Biermaier, Stephan
• Primary Examiner(s): ALEXANDER, LYLE
• Application Number:
  US08/034,165
• Time in Patent Office: 431 Days
• Field of Search: 422/292, 422/300, 422/301, 422/22, 422/36-28, 134/104.11
• US Class Current: 422/292
• CPC Class Codes: A61L 2/18 Liquid substances or solutions comprising solids or dissolved gases
• CPC Class Codes: E05B 1/0069 Sanitary doorknobs or handles, e.g. comprising a disinfectant

Abstract

An automated method of disinfecting door handles of units such as disinfecting apparatus. Disinfecting occurs in response to a predetermined function or state, such as the termination of a cleansing operation in a disinfecting apparatus, established time intervals, or a set number of manipulations of the door handle. The door handle may be disinfected by physically moving the handle into the disinfecting apparatus chamber. Alternatively, the handle may be sprayed or impregnated with a disinfecting solution. As another alternative, the door handle may be covered with a sterile, protective film. As a final alternative, the door handle may be disinfected by thermal convection.

Claims

1. A disinfecting system comprising:

a disinfecting apparatus comprising wall means defining a disinfection chamber, a door for providing selective access to said disinfection chamber, means for disinfecting objects placed within said chamber, and a handle mounted to one of said wall means and said door and accessible from an exterior of said disinfecting apparatus;

wherein an improvement comprises;

handle disinfecting means for selectively, automatically disinfecting said handle while said handle remains mounted to said one of said wall means and said door, said handle disinfecting means including a source of liquid disinfectant, at least one spray nozzle provided on at least one of said door and said wall means, and separate from said handle, for directing a liquid disinfectant toward and onto a surface of the handle, and means for conveying liquid disinfectant from said source to said at least one spray nozzle; and

control means for controlling an operation of said handle disinfecting means, so that said liquid disinfectant is conveyed to said handle disinfecting means one of at predetermined time intervals and in response to the disinfecting apparatus entering a specified state.

2. A disinfecting system comprising:

a disinfecting apparatus having a disinfecting means for disinfecting objects placed within an interior of the apparatus; and

a handle attached to and accessible from an exterior of said disinfecting apparatus;

wherein an improvement comprises;

means for drawing sterile tubular film over said handle including;

a supply reel located at a first end of said handle to supply the film to enclose said handle;

a discharge reel disposed at a second end of said handle to take up the film from the handle;

a knife, disposed adjacent to said discharge reel, for cutting the film after passing over said handle and before being wound on said discharge reel; and

rotating means for rotating said reels so as to transport the film over said handle; and

wherein said system further comprises;

control means for controlling an operation of said drawing means, for automatically enclosing the handle within said sterile tubular film in response to one of passage of a predetermined period of time and a predetermined state of operation of the disinfecting apparatus.

3. A disinfecting system comprising:

a disinfecting apparatus comprising wall means defining a disinfection chamber, a door for providing selective access to said disinfection chamber, means for disinfecting objects placed within said chamber, and a handle mounted to one of said wall means and said door and accessible from an exterior of said disinfecting apparatus;

wherein an improvement comprises;

handle disinfecting means for selectively, automatically disinfecting said handle while said handle remains mounted to said one of said wall means and said door, said handle disinfecting means including an induction coil mounted to one of said wall means and said door and adjacent to handle so as to direct a magnetic field produced by said coil about said handle; and

control means for controlling an operation of said handle disinfecting means so that said induction coil is selectively moved in and out of an operating position on the basis of a predetermined cleaning cycle of said disinfecting apparatus.

4. A disinfecting system according to claim 3, wherein said handle disinfection means includes means for transporting said induction coil to surround said handle in a first position and to withdraw from said handle in a second position.

5. A disinfecting system comprising:

a disinfecting apparatus comprising wall means defining a disinfection chamber, a door for providing selective access to said disinfection chamber, means for disinfecting objects placed within the chamber, and a handle fixedly mounted to one of said wall means and said door so as to be at least selectively accessible from an exterior of said disinfecting apparatus;

wherein an improvement comprises;

handle disinfecting means for selectively, automatically disinfecting said handle while said handle remains mounted to said one of said wall means and said door, said handle disinfecting means including means for selectively exposing said handle to an interior of said chamber while said disinfecting apparatus is operating, said handle disinfecting means providing access to the handle form outside said chamber when in a first state and providing access to the handle from inside said chamber when in a second state, wherein in said second state the handle can be disinfected together with the objects in said chamber; and

control means for controlling an operation of said handle disinfecting means, said control means placing the handle disinfecting means in one of said first and second states on the basis of a predetermined cleaning cycle of the disinfecting apparatus.

6. A disinfecting system according to claim 5, further comprising:

a fixed window defined in said one of said wall means and said door and which said handle is disposed;

a semicylindrical cover mounted to said one of said wall means and said door adjacent said window so as to be pivotable about a cylinder axis parallel to a longitudinal axis of said handle;

wherein said semicylindrical cover is placed in a first position that obstructs the window from inside said chamber when said apparatus is in said first state and said semicylindrical cover is placed in a second position that obstructs the window from outside said chamber when said apparatus is in said second state.

7. A disinfecting system according to claim 5, further comprising:

a fixed window defined in said one of said wall means and said door, wherein said handle is fixedly mounted so as to be within an interior of said chamber adjacent to the window;

a moveable plate mounted upon an inner surface of said one of said wall means and said door adjacent to said window, said plate closing said window by obstructing it in a first position and opening said window by not obstructing it in a second position;

wherein said moveable plate is placed into said second position when said disinfecting apparatus is placed into said first state and said moveable plate is placed into said first position when said disinfecting apparatus is placed into said second state.

8. A disinfecting system comprising:

a disinfecting apparatus comprising wall means defining a disinfection chamber, a door for providing selective access to said disinfection chamber, means for disinfecting objects placed within said chamber, and a handle mounted to one of said door and said wall means, wherein said handle is comprised of first and second portions;

wherein an improvement comprises;

handle disinfecting means for selectively, automatically disinfecting said handle while mounted to said disinfecting apparatus, said handle disinfecting means including means for moving said handle through a plane defined by said one of said wall means and door between a first and second position, wherein in said first position said first handle portion is within said disinfection chamber and said second handle portion is outside said disinfection chamber and in said second position said first handle portion is outside said disinfection chamber and said second handle portion is within said disinfection chamber; and

control means for controlling an operation of said handle disinfecting means, said control means disposing said first or second handle portion into said chamber on the basis of a predetermined cleaning cycle of said disinfecting apparatus.

9. A disinfecting system according to claim 8 wherein:

the handle is a closed ring, half disposed within the disinfecting apparatus and half disposed outside of the disinfecting apparatus.

10. A disinfecting system comprising:

a disinfecting apparatus comprising wall means defining a disinfection chamber, a door for providing selective access to said disinfection chamber, and means for disinfecting objects placed within said chamber;

wherein an improvement comprises;

a first handle mounted on a first side of said door;

a second handle mounted on a second side of said door;

handle disinfecting means for selectively, automatically disinfecting one of said first and second handles while mounted to the door by exposing one of said first and second handles to the chamber of said disinfecting apparatus, said handle disinfecting means including hinge means for selectively reversing a facing disposition of said first and second sides of said door; and

control means for controlling an operation of said handle disinfecting means, said control means controlling the operation of said hinge means so as to reverse the a facing direction of said first and second sides of said door on the basis of a predetermined cleaning cycle of the disinfecting apparatus.