Maintaining disinfection of medical equipment
A method is provided for maintaining the disinfection of medical equipment, in particular medical endoscopes ( 10 ), following processing. The method comprises placing the disinfected equipment ( 10 ) in a sealed chamber ( 12 ), and subsequently reducing the pressure within the sealed chamber ( 12 ) to cause evaporation of residual moisture. Gas scavenger sachets ( 21 ) are also provided within the sealed chamber ( 12 ) to remove atmospheric oxygen, thus causing a further reduction in the chamber pressure. The method may optionally include a further step of charging the sealed chamber ( 12 ) with a disinfectant gas or vapor. The processed medical equipment ( 10 ) is then maintained at the desired level of disinfection within the controlled biostatic environment in the sealed chamber ( 12 ).
1. A method for maintaining disinfection of medical equipment following processing thereof, comprising placing disinfected equipment in a sealed chamber comprising
a reusable tray having a rigid construction, and having a downwardly-dished, inner compartment defined by a generally planar base and surrounding walls upstanding thereform; and
a protective cover comprising a rigid lid having tapered edges engaging with complementary tapered edges provided on the walls of the tray, thereby to provide a substantially gas-tight seal;
wherein at least one of said tray and said cover has a valve for connection to a disinfection maintenance station comprising a suction device and a vessel for a disinfectant;
and wherein the tray is housed within an oxygen-impermeable pouch, also having a valve for connection to said disinfection maintenance station, and arranged to communicate with said valve in at least one of said tray and said cover, and subsequently performing the following steps:
(A) reducing pressure within the sealed chamber using said suction device, thereby to cause evaporation of residual moisture;
(B) removing atmospheric oxygen from the sealed chamber, thus further reducing pressure within the sealed chamber, using a gas scavenger present in at least one sachet;
(C) charging the sealed chamber with a disinfectant from said vessel, said disinfectant being selected from a disinfectant gas and a disinfectant vapour;
and subsequently maintaining a biostatic environment within the sealed chamber, whereby viable inter-procedural disinfected storage time for said medical equipment is greater than 3 hours.
2. The method as claimed in claim 1 , wherein maintenance of a biostatic environment within the sealed chamber is achieved by maintaining reduced pressure.
3. The method as claimed in claim 1 , wherein maintenance of a biostatic environment within the sealed chamber is achieved by maintaining the charge of disinfectant from step (C).
4. The method as claimed in claim 1 , wherein evaporated residual moisture from step (A) and atmospheric water vapour are removed from the sealed chamber using a desiccant.
5. The method as claimed in claim 1 , wherein in step (B) at least one further gas selected from carbon dioxide, hydrogen sulphide, sulphur dioxide, hydrogen chloride and ammonia is removed from the sealed chamber using at least one appropriate further gas scavenger, wherein said at least one further gas scavenger includes a material selected from finely divided iron powder and activated carbon.
6. The method as claimed in claim 1 , wherein the sealed chamber is provided with an oxygen indicator, to provide a visual indication of the condition of the chamber.
7. The method as claimed in claim 1 , wherein the disinfectant comprises at least one component selected from dry disinfectant nitrogen gas and hydrogen peroxide vapour.
8. The method as claimed in claim 1 , wherein the re-usable tray is further provided with a single-use, disposable tray-liner formed of a flexibly deformable, sheet material such that in use the tray-liner is able to conform itself substantially to the contours of the tray.
9. The method as claimed in claim 1 , wherein said at least one gas scavenger sachet is activated by removing a tear-off strip to expose said scavenger to atmospheric oxygen.
10. The method as claimed in claim 1 , wherein multiple sealed chambers individually housed in pouches are provided within a rack to enable disinfection of a plurality of articles of medical equipment to be maintained simultaneously, and independently of one another, and wherein removal of a selected article of medical equipment from its sealed chamber does not compromise disinfection of other articles of medical equipment also housed in like chambers within the rack.
11. The method as claimed in claim 10 , wherein said rack comprises a plurality of disinfection maintenance stations, each comprising a port for engaging with the valve of a said pouch housing a said sealed chamber, each said port enabling fluid connection of a said sealed chamber to a said suction device for performance of step (A).
12. The method as claimed in claim 11 , wherein each said port further enables fluid connection of a said sealed chamber to a said vessel for disinfectant, for performance of step (C).