Surgery – Respiratory method or device – Inhaled gas heated or humidified by exhaled gas
Patent
1995-03-23
1997-01-14
Millin, V.
Surgery
Respiratory method or device
Inhaled gas heated or humidified by exhaled gas
12820527, A61M 1600, A62B 900
Patent
active
055929338
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a hygroscopic cartridge particularly for filters for medical use.
BACKGROUND ART
As known, in many medical applications, and in particular in the fields of medicine and surgery, filters treated with hygroscopic salts are currently used. The filters are employed as humidifying elements to provide a respiration process which is similar to the normal physiological action of the respiratory tract.
Italian Patent Application No. 21794 A/90, filed on Oct. 19, 1990, discloses a hygroscopic cartridge for filters which is made substantially of a band constituted by first and second layers of paper impregnated with hygroscopic salts. The layers are superimposed and have mutually opposite corrugations forming a plurality of channels which extend transversely with respect to the plane of lay of the bobbin.
This type of filter, which has proved to be valid in some respects, is however not devoid of inconveniences. It is relatively difficult to manufacture since the channels are created by forming corrugations on paper bands and thus, during winding, the channels may be crushed such that the transverse cross sectional passage area of the channels is substantially reduced.
A further disadvantage resides in the fact that, during inhalation, air entering the filter creates a significant drop in the temperature of the filter cartridge, with a consequent increase in condensation and a reduction in the moisture content of the aeriform flow which the patient breathes.
DISCLOSURE OF THE INVENTION
Wiyh the foregoing and other objects in view, there is provided a hygroscopic cartridge particularly for filters for medical use, which permits the accumulation of heat in the filter during the exhalation phase with a successive release of heat during the inhalation phase, consequently increasing the humidity content of the aeriform inflow.
Within the above aim, an object of the present invention is to provide a hygroscopic cartridge having elements which impart a relatively stable configuration to the channels for the passage of the aeriform flow, employing means which are not susceptible to "crushing" even during the winding of the cartridge, thereby providing a correct transverse cross sectional passage for the aeriform flow.
Another object of the present invention is to provide a hygroscopic cartridge particularly for filters for medical use which, by virtue of its unique characteristics, is highly reliable and safe in use.
A further object of the present invention is to provide a hygroscopic cartridge particularly for filters for medical use which can be easily manufactured by using commercially available elements and materials.
BRIEF DESCRIPTION OF THE DRAWINGS
Further characteristics and advantages of the hygroscopic cartridge particularly for filters for medical use, will become apparent from the following description of a preferred but non-exclusive embodiment thereof, shown in the following illustrative non-limitative drawings wherein:
FIG. 1 is a schematic exploded perspective view of the cartridge according to the present invention, showing one embodiment of the filter;
FIG. 2 is a perspective view showing the overlapping of the layers;
FIG. 3 is a plan view showing the adjacent layers;
FIG. 4 is a sectional view of a filter incorporating a cartridge according to the present invention.
WAYS OF CARRYING OUT THE INVENTION
With reference to the above-mentioned drawing figures, the hygroscopic cartridge particularly for filters for medical use, according to the present invention, is generally designated by the reference numeral 1. The cartridge 1 comprises a band-like element 2 which is wound so as to form a flat bobbin 7 which may have any configuration, such as a circular, oval, or similar configuration.
An important characteristic of the present invention is constituted by the fact that the band-like element 2 has a first layer or tape 3 provided with a plurality of corrugations 4, which extend in a transverse direction with respect to the longitudinal extension o
REFERENCES:
patent: 3433692 (1969-03-01), Gewiss
patent: 4497753 (1985-02-01), Streif
patent: 5384178 (1995-01-01), Rye
Hey David A.
Mallinckrodt Medical Inc.
Millin V.
Raciti Eric P.
LandOfFree
Hygroscopic cartridge particularly for filters for medical use does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hygroscopic cartridge particularly for filters for medical use, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hygroscopic cartridge particularly for filters for medical use will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1381794