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. 05, 2002
Filed:
Mar. 14, 2001
Applicant:
Inventors:
Lars Peter Klitmose, Gentofte, DK;
Henrik Ljunggreen, Ballerup, DK;
Assignee:
Novo Nordisk A/S, Bagsvaerd, DK;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01B 9/00 ;
U.S. Cl.
CPC ...
F01B 9/00 ;
Abstract
A flexible piston rod for an injection device, which piston has the form of a helical spring made from a number of narrowly adjacent turns of windings. These turns provide an external thread fitting into the internal thread of a nut element. When the nut element is rotated, the piston rod is advanced forward, which movement is used to displace a piston inside a cartridge containing a fluid to be expelled. In order to prevent the piston rod from rotating when the nut element is rotated, the helical spring making up the piston rod is provided with a longitudinal spine, which is located at a peripheral area of the helical spring.