Medical ventilator
Patent 5494028 Issued on February 27, 1996. Estimated Expiration Date: 
February 27, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 27, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsAssigneeApplicationNo. 116701 filed on 11/04/1987US Classes:128/205.24, Valve, or valve control, structure128/204.18, Means for supplying respiratory gas under positive pressure128/204.21, Electric control means128/204.23, Means for sensing condition of user's body251/256EncasedExaminersPrimary: Hindenburg, MaxAssistant: Lacyk, John P. Attorney, Agent or FirmForeign Patent References
International ClassA62B 009/02AbstractA medical ventilator having a valve which controls the flow of gas from a pressurized gas source to a patient for inhalation. Flow through the valve is choked and pressure upstream of the valve is held stable so that a known relationship exists between the position of the valve and the flow rate through the valve. An open loop control system causes the valve to open or close as needed to deliver a preselected tidal volume of gas to the patient on each breath. Since the flow rate is known, no feedback to the controller regarding actual flow conditions is required. The exact positioning of the valve and length of time that the valve is to be held open is predetermined by the controller before the breath is delivered, and is repeated for subsequent breaths. Preferably, the valve is driven by a stepping motor, and the controller comprises a microcomputer. The controller compensates for ramping of the stepping motor as the valve opens and closes in determining the positions of the valve required to deliver the preselected tidal volume. To ensure precise engagement between a valve member and a valve seat, the valve member is mounted on a flexible, linear wire. Additionally, a spirally-wound spring surrounds a stepping motor shaft and biases the shaft so as to close the valve in the event of a power loss.Other References
Field of SearchInvolving nucleic acidEnzymatic production of a protein or polypeptide (e.g., enzymatic hydrolysis, etc.) Using tissue cell culture to make a protein or polypeptide SUBCELLULAR PARTS OF MICRO-ORGANISMS MICRO-ORGANISM, TISSUE CELL CULTURE OR ENZYME USING PROCESS TO SYNTHESIZE A DESIRED CHEMICAL COMPOUND OR COMPOSITION Antigens BIOSPECIFIC LIGAND BINDING ASSAY Nucleoproteins, e.g., chromatin, chromosomal proteins, histones, protamines, salmine, etc. PROTEINS, I.E., MORE THAN 100 AMINO ACID RESIDUES Immunoglobulin, antibody, or fragment thereof, other than immunoglobulin antibody, or fragment thereof that is conjugated or absorbed N-glycosides, polymers thereof, metal derivatives (e.g., nucleic acids, oligonucleotides, etc.) Synthesis of polynucleotides or oligonucleotides | |
