Surgery – Respiratory method or device – Face mask covering a breathing passage
Reexamination Certificate
1998-10-30
2001-07-24
Lewis, Aaron J. (Department: 3761)
Surgery
Respiratory method or device
Face mask covering a breathing passage
C128S910000, C128S205250
Reexamination Certificate
active
06263874
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a oral scavenging hood for use when a nasal anesthesia mask is used for inhaled sedation.
The administration of anesthetic or analgesic (inhalation sedation) gas to patients involves a mask (hood) which is placed over the nose of the patient and the introduction of a controlled amount of gas, through the mask, to the patient. Heretofore, such gas that either has leaked from the mask perimeter or was exhaled by the patient has been allowed to dissipate into the ambient environment. Concerns about the danger presented by this escaping gas in the environment of an operating room, particularly the side effects on personnel who are subject to this environment on a continual basis, have prompted increased attention and approaches to the elimination of such gas escape. Consequently, nasal anesthesia masks including scavenging means are well-known in the art. Among such art, are the following patents:
Kelley U.S. Pat. No. 3,867,936 Patented Feb. 25, 1975
That patent provided a structure whereby while anaesthetic gas which was administered to a patient, and which was exhaled from the patient was passed through a replaceable, man-transportable absorber unit to absorb the anaesthetic gas employed.
Parkes U.S. Pat. No. 4,112,940 Patented Sep. 12, 1978
That patent provided a scavenging valve for anaesthesia gas which was released in pediatric anaesthesia apparatus which was of generally conical configuration and which had an axial bore extending therethrough from an open base to an open apex. A control valve comprised a pair of nipples, each of generally-conical configuration, in base-to-base relation with an axial bore extending therethrough from one open apex end to the other. The control valve had a radially-extending bore which tapered down from the bases. The control valve coupled an anaesthesia bag to the scavenging valve and had a gas flow control and shut off plate pivotally mounted in the bore thereof in the area of the bases of the control valve. A manually-operable control member was provided outside the control valve.
Brown U.S. Pat. No. 4,015,598
That patent disclosed a double wall face mask, i.e., a mask over a mask. The inner mask defined a chamber over the patient's face communicating with a source of gas to be inhaled. The outer mask enclosed and defined an exhaust chamber outside of the inner mask, the exhaust chamber communicating with a gas removal line. A check valve opened the facial chamber to the exhaust chamber during exhalation and the exhaust chamber was open to the surrounding atmosphere adjacent the face-engaging perimeter of the inner mask to draw escaped gases from the surrounding atmosphere into the exhaust passage for disposal.
Czajka U.S. Pat. No. 4,219,020 Patented Aug. 26, 1980
That patent provided a mask assembly for administering a gas to be inhaled by an individual including a mask body to fit over the nose of the individual, and against the surrounding facial area of said individual, the mask body terminating in a peripheral surface contoured to fit against the facial area of said individual and when so positioned defining therewith a mask chamber, the mask body also including an inlet port which was adapted to be operatively connected to a source of gas to be administered to said individual thereby to direct said gas to said mask chamber. Valve means were provided including a valve body member disposed through the mask body in an area of the mask body remote from the contoured peripheral surface, the valve body member including an exhalation valve member movable between a first seated closed position during inhalation of the individual and a second open position during exhalation of said individual, the valve body member including a first exhaust chamber formed about the exhalation valve member to receive exhalation gas of said individual flowing through said exhalation valve member and a second annular exhaust chamber formed of a pair of substantially frustoconically shaped members radiating outwardly from said valve body member and spaced from each other to define said second annular exhaust chamber. Means afforded fluid communication between the first and second exhaust chambers and an outlet port which was adapted to be connected to a vacuum source in one of the exhaust chambers, thereby to provide a source of vacuum to each of the first and second exhaust chambers to exhaust gas exhaled by said individual. The pair of radiating members defined an area at their termini, the area being disposed circumferentially and outwardly of the mask body and being located distantly from the periphery surface and the facial area of the individual when the mask was in use and being spaced from said inlet port. The pair of radiating members had inlet means to the annular exhaust chamber near the outer edge surface of the annular exhaust chamber, thereby to establish a suction effect about the whole exterior of the mask body when the mask body was connected to the vacuum source.
Fischer U.S. Pat. No. 4,248,218 Patented Feb. 3, 1981
That patent provided a scavenging mask apparatus for administering gas to a patient, wherein lost and exhaled gas was scavenged by vacuum means. The apparatus included a nosepiece which was adapted to fit over the patient's nose and was shaped to form a seal between the rim of the nosepiece and the patient's face. Means connected the nosepiece to a source of vacuum. A nasal cannula was disposed inside the nosepiece and attached thereto. Means were provided for connecting the cannula to a source of gas. The constant flow of gas entering the cannula was delivered directly to the patient's nostrils. Any gas escaping from the cannula, as well as gas which was exhaled through the nostrils, was scavenged by the continuous air flow inside the nosepiece and was swept toward the source of vacuum. One or more holes in the underside of the nosepiece broke the vacuum, allowing air flow for scavenging gas exhaled through the patient's mouth. The holes also prevented the mask from locking onto the patient's face due to suction.
Fischer, Jr. et al U.S. Pat. No. 4,25,239 Patented May 5, 1981
That patent provided an exhaust assembly for a gas supply system for administering gas to a patient, the system having a remote vacuum means, a scavenging mask with a peripheral chamber adjacent to the rim of the mask, means for supplying gas to the mask, means for removing exhaled gas from the mask, and an exhaust port communicating with the mask through the means for removing exhaled gas. The exhaust assembly included resistance means communicating with the exhaust port for creating a resistance to gas flow therefrom. It also included divider means for dividing gas flow, the divider means communicating with the resistance means, with the peripheral chamber, with the ambient atmosphere, and with the remote vacuum means, so that the vacuum-induced gas flow was divided between exhaled gas from the exhaust port, scavenged gas from the peripheral chamber and air from the ambient atmosphere.
Thompson, Sr. U.S. Pat. No. 4,312,339 Patented Jan. 26. 1982
That patent provided a system for administering an anaesthetic gas to a patient, including a mask, means for supplying an anaesthetic gas to the mask when the patient inhaled, and an exhaust line having its proximal end connected to the mask and adapted to have its terminal end connected to a source of vacuum to exhaust gas from the mask when the patient exhaled. A closed reservoir was in series with the exhaust line between the proximal and terminal ends thereof. The reservoir had an inlet and an outlet with a check valve adjacent to the inlet to prevent the flow of gas out of the reservoir through the inlet when the patient inhaled. A nozzle was secured to one side of the face mask for scavenging gas escaping from the mask and a second exhaust line was connected the nozzle directly to the upper end of the lower portion of the reservoir. A tube connected the upper and lower portions of the reservoir and had an opening adjacent the bott
Au James Wing
LeDez Kenneth Michael
Lewis Aaron J.
Meyer Jerald L.
Nath Gary M.
Nath & Associates PLLC
Weiss, Jr. Joseph F.
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