US Patent No: 6,581,594
Number of patents in Portfolio can not be more than 2000
Respiratory mask having gas washout vent and gas washout vent for respiratory mask
Stats
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Jun 24, 2003
Issued date -
May 15, 2000
filing date -
09/570,907
serial no -
In Force
status
Importance
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Abstract
The present invention provides a vent assembly suitable for use with a respiratory mask of the type used in CPAP treatment. In one embodiment the vent is made of a thin air permeable membrane. Generally, the membrane is thinner than 0.5 mm. The membrane can be made of a hydrophobic material such as polytetrafluoroethylene (PTFE). The membrane can also be fabricated from expanded PTFE. The expanded PTFE membrane is mounted on a polypropylene scrim. The pores of the membrane have a reference pore size of 10 to 15 microns. In an alternative embodiment, the vent assembly includes a vent constructed from stainless steel. In another embodiment the membrane has a superficial cross-sectional area of approximately 500 mm.sup.2. In another embodiment the vent assembly comprises a membrane attached to a vent frame, the vent assembly forming an insert which can be removeably attached to a mask fame.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 5,560,354 Facial masks for assisted respiration or CPAP | 196 | 1994 | |
| 6,112,746 Nasal mask and mask cushion therefor | 198 | 1997 | |
| 6,119,693 Forehead support for facial mask | 194 | 1998 | |
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| 5,477,852 Nasal positive airway pressure apparatus and method | 156 | 1993 | |
| 5,657,752 Nasal positive airway pressure mask and method | 158 | 1996 | |
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| 6,192,886 Nasal mask | 125 | 1996 | |
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| 5,065,756 Method and apparatus for the treatment of obstructive sleep apnea | 144 | 1987 | |
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| 5,148,802 Method and apparatus for maintaining airway patency to treat sleep apnea and other disorders | 230 | 1989 | |
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| 5,937,851 Swivel device utilizing bearing clearance to allow carbon dioxide laden exhaust | 98 | 1997 | |
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| 4,258,710 Mask-type respirator | 23 | 1978 | |
| 4,266,540 Nasal oxygen therapy mask | 48 | 1978 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Dec 24, 2014 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |