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:
Oct. 29, 1996
Filed:
Jul. 22, 1994
Stephen J Brown, Palo Alto, CA (US);
Raya Systems, Inc., Mountain View, CA (US);
Abstract
An apparatus for electrically determining and recording the dose of an agent delivered with a syringe consisting of a barrel for holding the agent and a plunger for expelling the agent. The syringe has a conducting path with an input terminal and an output terminal, and at least one electrically resistive element, whose resistance changes depending on the position of the plunger inside the barrel. The apparatus produces a voltage difference across the terminals and causes an electric current to flow through the conducting path. An electric response measuring device, preferably an ammeter, measures the electric current delivered from the syringe's output terminal and calculates the dose therefrom. The result is recorded by a digital memory unit.