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. 15, 1991
Filed:
Mar. 17, 1989
Jerrold L Foote, Salt Lake City, UT (US);
Darla R Gill, Salt Lake City, UT (US);
Fred P Lampropolous, Salt Lake City, UT (US);
William Padilla, Bennion, UT (US);
Merit Medical Systems, Inc., Salt Lake City, UT (US);
Abstract
A syringe and method for use which may be selectively operated between a free position and a locked position. A triggering device configured with a trigger attached to the plunger of the syringe is employed. The triggering device includes a set of threads located on the plunger and a corresponding set of threads on the barrel of the syringe. Upon actuation of the trigger, the threads on the plunger are retracted from their position of engagement with the threads on the barrel, thereby placing the syringe in position for free movement of the plunger with respect to the barrel. The threads are biased in the engaged position. Thus, when the trigger is released, the threads on the plunger return to their position of engagement with the threads on the barrel. In the locked position, the plunger may be screwed into or out of the barrel by rotating the plunger, enabling the operator of the syringe to maintain strict control over the amount of pressure in the syringe. The triggering device employs a plurality of ramp and channel configurations which are disposed at approximately the same angle as the threads on the plunger and barrel. Thus, upon actuation of the triggering device, no net force results on the plunger which would cause movement of the plunger with respect to the barrel.