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1. WO1997024153 - DUAL-FILTERED ISOLATION VALVE FOR RESUSCITATION

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[ EN ]

CLAIMS
I claim:
1. A dual-filtered rotary isolation valve for resuscitation of patients, which comprises:
an upper housing (1) having an upper tube (3) containing a bore (4)
formed by a surrounding upper tube wall (5), the first end (6) of which upper
tube (3) may either be placed directly into a care provider's mouth or be
connected to a mouthpiece to be placed into the mouth of the care provider, the
second end (7) of which upper tube (3) expands outward to create a top (8) of
an upper chamber segment (9) and then returns to its original direction to form
a wall (10) of an upper chamber segment (9) having a circular cross section
concentrically located with respect to the cross section of the upper tube (3). the
cross section of said upper tube (3) also being circular, and the wall (10) of the
upper chamber segment (9) protruding outward at a location between the top
(8) of the upper chamber segment (9) and the bottom (21) of the wall (10) of
the upper chamber segment (9) to create an annular ridge;
a lower housing (2) having a lower tube (11) containing a bore (12)
formed by a surrounding lower tube wall (13), the first end (14) of which lower
tube (1 1) may either be placed directly into the patient's mouth or be connected
to a mask to be placed around the nose and mouth of the patient or be attached
to a mouthpiece to be inserted into the mouth of the patient, the second end (15)
of which lower tube (11) expands outward to create a bottom (16) of a lower
chamber segment (17) and then returns to its original direction to form a wall
(18) of a lower chamber segment (17) having a circular cross section
concentrically located with respect to the cross section of the lower tube (11),
the cross section of said lower tube (1 1 ) also being circular, the wall (18) of the
lower chamber segment (17) bulging outward to create an annular channel (20)
at a location between the bottom (16) of the lower chamber segment (17) and the top (19) of the wall (18) of the lower chamber segment (17) so aligned with the annular ridge (22) in the wall (10) of the upper chamber segment (9) that the lower chamber segment (17) can be snap-fit onto the upper chamber segment

(9), the inner diameter of the wall (18) of the lower chamber segment (17) being slightly greater than the outer diameter of the wall (10) of the upper chamber segment (9) to permit the lower chamber segment (17) to rotate with respect to the upper chamber segment (9), the inner diameter of the annular channel (20) being slightly greater than the outer diameter of the annular ridge

(22) but not so much greater that the lower chamber segment (17) could slip from the upper chamber segment (9) once the lower chamber segment (17) and the upper chamber segment (9) have been snap-fit together, one or more apertures (25) existing in the bottom (16) of the lower chamber segment (17), and an annular step (26) formed at the junction of the bottom (16) of the lower chamber segment (17) and the wall (18) of the lower chamber segment (17);
an exhalation filter (23) placed on the bottom ( 16) of the lower chamber segment (17), which exhalation filter (23) contains an aperture (24) that is approximately aligned with the bore (12) of the lower tube (1 1);
a flexible diaphragm (27) having a check valve (28) near the center of said flexible diaphragm (27), having a support (29) which rests on the exhalation filter (23) adjacent to the support (29) but covering only the outer edge of the exhalation filter (23) so that the majority of the surface (30) of the exhalation filter (23) that is opposite to the bottom (16) of the lower chamber segment (17) is adjacent to a passage (31) which communicates with the bore

(12) of the lower tube (1 1), and having an outer edge (32) that extends into the space (33) between the wall (18) of the lower chamber segment (17) and the wall (10) of the upper chamber segment (9) with the bottom (21) of the wall an air-tight seal between the upper chamber segment (9) and the lower chamber
segment (17); and
a transmission filter (34), said transmission filter (34) filling the upper
chamber segment (9) and being adjacent to the diaphragm (27).
2. The dual-filtered rotary isolation valve for resuscitation of patients as recited in claim 1 , wherein:
the transmission filter (34) has an upper filter segment (35) and a lower
filter segment (36), the upper filter segment (35) being adjacent to the top (8) of
the upper chamber segment (9) and the lower filter segment (36) being adjacent
to the diaphragm (27), with an annular spacer (37) separating the upper filter
segment (35) from the lower filter segment (36) and thereby creating an air
space (38).
3. The dual-filtered rotary isolation valve for resuscitation of patients as recited in claim 2, wherein:
the upper filter segment (35) is hydrophobic.
4. The dual-filtered rotary isolation valve for resuscitation of patients as recited in claim 3, wherein:
the lower filter segment (36) is hydrophilic.
5. The dual-filtered rotary isolation valve for resuscitation of patients as recited in claim 4. wherein:
the exhalation filter (23) is hydrophobic.
6. The dual-filtered rotary isolation valve for resuscitation of patients as recited in claim 5, further comprising:
two thin bands (40) placed parallel to one another across the second end
(7) of the upper tube (3) and connected to the tube wall (5) of the upper tube
(3).
7. The dual-filtered rotary isolation valve for resuscitation of patients as recited in claim 1. wherein: the check valve (28) is a duck-bill valve, the valve lips (39) of which
duck-bill valve axially extend into the bore (12) of the lower tube (1 1).
8. The dual-filtered rotary isolation valve for resuscitation of patients as recited in claim 7, wherein:
the transmission filter (34) has an upper filter segment (35) and a lower
filter segment (36), the upper filter segment (35) being adjacent to the top (8) of
the upper chamber segment (9) and the lower filter segment (36) being adjacent
to the diaphragm (27), with an annular spacer (37) separating the upper filter
segment (35) from the lower filter segment (36) and thereby creating an air
space (38).
9. The dual-filtered rotary isolation valve for resuscitation of patients as recited in claim 8, wherein:
the upper filter segment (35) is hydrophobic.
10. The dual-filtered rotary isolation valve for resuscitation of patients as recited in claim 9, wherein:
the lower filter segment (36) is hydrophilic.
1 1. The dual-filtered rotary isolation valve for resuscitation of patients as recited in claim 10, wherein:
the exhalation filter (23) is hydrophobic.

12. The dual-filtered rotary isolation valve for resuscitation of patients as recited in claim 1 1, further comprising:
two thin bands (40) placed parallel to one another across the second end
(7) of the upper tube (3) and connected to the tube wall (5) of the upper tube
(3).