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:
Aug. 04, 1987
Filed:
Apr. 12, 1985
Irving Schaffer, Fairfield, CT (US);
Claude L Emmerich, Scarsdale, NY (US);
Meditec Research Associates, Westport, CT (US);
Abstract
An apparatus for ambulatory intravenous delivery of substances to a recipient comprising a container and delivery means for pressurized delivery of the substance. The container communicates with a source of pressurized gas to provide the pressurizing force and is uniquely attachable to the recipient so as to provide portability to the system. The flow rate is controlled by feedback electronics connected to a flow rate meter and a throttle valve. The flow rate meter has a heating resistor in the flow path of the substance and a thermistor to detect a temperature rise in the substance downstream from the resistor. A constriction in the flow tube is disposed between the resistor and thermistor to cause a flat wavefront of temperature increase. The throttle valve is a pin disposed partially within a tube to form an annular gap. The flow rate is adjusted by changing the distance the pin extends into the tube and thereby change the length of the annular gap.