Device, system and method of interconnecting doorways
A doorway interconnection and method of creating an airtight seal between two doorways includes a first temporary membrane creating an airtight seal on a first doorway and a second temporary membrane creating an airtight seal on a second doorway and a gasket between the two doorways, and vents and valves to place and remove a sterilizing fluid in the inter-doorway volume. Such a system may be used to attach a sterile modular building unit to a sterile facility without losing the sterility of either the facility or the module building unit. Access to the membranes may be from one direction only. The gasket may provide motion and sound isolation between. Additional elements limit relative motions between the first and second doorways.
1. An air seal for use between a first, fixed doorway and a second, movable doorway comprising:
wherein the first doorway comprises an inside face and an opposing outside face; wherein the second doorway comprises an inside face and an opposing outside face; wherein the outside face of the first doorway faces the outside face of the second doorway;
a first membrane removably attached on a face of the first doorway blocking airflow through the first doorway;
a second membrane removably attached on a face of the second doorway blocking airflow through the second doorway;
a pliable annulus removably placed between the outside of the first doorway and the outside of the second doorway, creating an airtight inter-doorway volume, the volume surrounded in part by the pliable annulus and both membranes;
a first fluid vent and operable first valve between the inter-doorway volume and free air.
2. The air seal of claim 1 wherein access to the first membrane for attachment is from an air volume in contact with the inside face of the first doorway.
3. The air seal of claim 1 wherein access to the second membrane for attachment is from an air volume in contact with the outside face of the second doorway.
4. The air seal of claim 1 wherein the pliable annulus is inflatable.
5. The air seal of claim 1 wherein the pliable annulus is a baffle.
6. The air seal of claim 1 further comprising one or more mechanical retainers, wherein each of the one or more mechanical retainer permits relative motion between the first doorway and the second doorway within a distance greater than a first preset distance and less than a second preset distance; and wherein each of the one or more mechanical retainer limits relative motion between the first doorway and the second doorway less than the first preset distance and limits relative motion between the first doorway and the second doorway greater than the second preset distance.
7. The air seal of claim 1 wherein the membranes are single-use or limited use.
8. The air seal of claim 1 further comprising a second fluid vent and operable second valve between the inter-doorway volume and outside the inter-doorway volume; wherein one fluid vent accepts sterilizing fluid and the other fluid vent is an exhaust vent.
9. The air seal of claim 1 further comprising a first membrane support surface permanently attached to a perimeter of the first doorway wherein the first membrane is attached to the first membrane support surface.
10. The air seal of claim 1 further comprising a second membrane support surface permanently attached to a perimeter of the second doorway wherein the second membrane is attached to the second membrane support surface.
11. The air seal of claim 1 further comprising:
a sterile first building or module comprising the first doorway;
a sterile, mobile second building or module comprising the second doorway.
12. The air seal of claim 1 , wherein:
the air seal is between two modules of a modular vivarium.
13. The air seal of claim 1 wherein the two doorways, two membranes, and annulus create four air volumes isolated from each other: air on the inside of the first doorway and first membrane, air on the inside of the second doorway and second membrane, air in the inter-doorway gap, and ambient air.
14. A method of providing a sterile, airtight fitting between a first, fixed doorway and a second, movable doorway comprising the steps of:
(a) applying a first removable membrane to a first doorway, sealing the doorway;
(b) applying a second removable membrane to a movable second doorway, sealing the second doorway;
(c) placing removably a pliable annulus between the first and second doorway;
(d) moving the second doorway so that the pliable annulus is compressed, forming an airtight seal against both doorways, creating a sealed inter-doorway volume;
(e) using a sterilizing fluid, gas, aerosol or liquid to sterilize the inter-doorway volume;
(f) removing the first membrane;
(g) removing the second membrane;
wherein air may flow freely through both doorways and the inter-doorway volume.
15. The method of claim 14 , wherein:
the first doorway is in a vivarium, and
the second doorway is in a vivarium module.