The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 29, 1983
Filed:
Jul. 02, 1981
Douglas F De Vries, Redlands, CA (US);
Bear Medical Systems, Inc., Riverside, CA (US);
Abstract
A patient adaptor fitting for a medical ventilator includes a jet pump having a nozzle receiving breathing gas from the inspiratory leg of the patient circuit, and a throat in communication with the expiratory leg of the patient circuit. Gas flows from the nozzle to the throat through a chamber in communication with the patient's breathing passages. The nozzle and the throat are dimensioned so as to produce a pressure drop in the chamber which balances the pressure drop through the expiratory leg of the patient circuit, thereby minimizing residual positive end expiratory pressure (PEEP) caused by the pneumatic resistance in the expiratory leg. The throat and nozzle dimensions are also selected so that the minimization of the residual PEEP occurs over a relatively wide range of flow rates into the nozzle.