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:
Sep. 07, 2010
Filed:
Mar. 28, 2008
Wenjie Liu, Ma chi kou Town, Changping District, Beijing, CN;
Wenjie Liu, Ma chi kou Town, Changping District, Beijing, CN;
Other;
Abstract
The present invention provides an improved barrel type plunger for use with needle-retractable safety syringes. The plunger includes a barrel, a needle retracted trigger and a supporting member. A front portion of the barrel is fitted over a sealing rubber pad, a slotted hole is provided at a wall of the front portion of said barrel, a bearing piece is provided in the slotted hole, and one end of the bearing piece is connected to the front side wall of the slotted hole. The supporting member is releasably engaged in the barrel. After having released from the barrel, the supporting member is able to translate backwards under the action of a needle retraction force so that the bearing piece can be returned to such a position that the needle can be retracted backwards to the interior of the barrel.