Surgery – Truss – Pad
Patent
1986-12-23
1988-11-01
Schwartz, Larry I.
Surgery
Truss
Pad
128897, F24F 900
Patent
active
047811080
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to a method and a means for supplying clean air to an operating room or similar clean working places.
PRIOR ART
In U.S. Pat. No. 3,626,837 there is disclosed a device for supplying clean air to an operating table or similar. According to said device, the clean air is supplied through an inner ceiling and a laminar flow is directed vertically downwards towards the operating table. At the border areas of said laminar flow, the air is deflected outwards and in the area outside the zone of laminar air there is an area with turbulence. According to said patent specification, said turbulence will never reach the laminar area. However, practical experiencies show that the slightest disturbance of the flow pattern results in the air being contaminated. Already the operation personal and equipment such as an operating lamp, results in substantial disturbances of the ideal pattern such that the static pattern will be missleading in the practical case.
In the Swedish patent specification No. 213 277 there is disclosed a device for maintaining a zone of ventilated air in a room. According to the preferred embodiment the device comprises an air supply device in the ceiling of the room for supplying clean air and a slit surrounding said air supply device, whereby a curtain of air having high velocity surrounds the clean air. The device operates so that the air curtain having high air velocity excludes particles from the area inside the air curtain whereby the air supplied through the air supply device will remain clean.
The device according to said patent specification should operate well in the static case and has been used in practice with a certain success. However, the personal around an operating table will be positioned in said surrounding air curtain and are thus subjected to a strong draught. This may be acceptable, but means at the same time that said placement of the personal will disturb the air curtain and the air will be heavily spread. In certain cases such spreading will mean that particles from the surrounding air may reach inside the air curtain for diminishing the cleaness of the air inside the air curtain.
Moreover, an operating lamp is positioned above the operating table and said lamp entails that the air flow from the air supply device will be disturbed and results in a spreading of said air.
Moreover, the heavy surrounding air curtain means that particles outside said air curtain are ejected by said air flow. There is a risk that such particles subsequently will whirl up a second time inside the air curtain, i.e. in the middle of the clean air flow.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a method and a means for supplying clean air to an operating room or similar in which the drawbacks of the previously known devices have been almost completely eliminated.
In the practically case it is observed that there is almost always an operating lamp positioned right above the operating table. This lamp will of course disturb the flow pattern. In view thereof and according to the present invention, the clean air is not supplied vertically from above but from the side, either 45.degree. downwards or in a horizontally directed air flow. Embodiments therebetween will of course be plausible.
Fundamental for the invention is the observation that a surrounding air curtain with high air velocity according to the above-mentioned Swedish patent specification No. 213 277 always will be deflected inside towards the clean air positioned therein, since the air supply inside the air curtain takes place with a lower velocity. Thus, ejected particles in the air curtain will pass into the clean air.
According to the present invention, the air is supplied in a strong central air beam or curtain, a so called carry beam, surrounded by side lower velocity. The central carry beam will always eject air from the surroundings thereof. The ejected air will however be said secondary air supplied in said side areas and thus, said ejected air wil
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patent: 3462920 (1969-08-01), Denny
patent: 3511162 (1970-05-01), Truhan
patent: 3626837 (1971-12-01), Pelosi
patent: 3998142 (1976-12-01), Foreman et al.
patent: 4129122 (1978-12-01), Dout et al.
patent: 4471688 (1984-09-01), Smets
MTD Medical Technology and Development Ltd.
Schwartz Larry I.
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