Safety syringe preventing the needle storage mechanism from being operated before use

Patent metadata

Field	Value
Publication number	US-9408982-B2
Application number	US-99180706-A
Country	US
Kind code	B2
Filing date	Sep 12, 2006
Priority date	Sep 13, 2005
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

To provide a syringe with a needle storage mechanism in which the needle storage mechanism is not activated before use. A safety syringe including an injection barrel 1 having a connecting portion 11 at the distal end and an opening at the proximal end thereof, a needle assembly B having an injection needle 5 and a needle base 6 fixed to the proximal end of the injection needle 5 and being connected to the connecting portion 11 , a gasket 2 provided liquid-tightly and slidably in the injection barrel, a plunger 3 being connected to the proximal end of the gasket 2 and joining means 21 provided at the distal portion of the gasket 2 or the plunger 3 , and joined means 61 provided at the proximal portion of the needle base 6 , wherein a joint preventing means 90 which prevents the joining means 21 and the joined means 61 from being joined unintentionally before use, and allows joining to each other when in use is provided.

First claim

The invention claimed is:

1. A safety syringe including: a hollow and substantially cylindrical injection barrel having a distal end and a proximal end and having a connecting portion at the distal end and an opening at the proximal end thereof; a needle assembly including an injection needle and a needle base, the injection needle having a distal end and a proximal end, the needle base having a distal end and a proximal end, and the needle base being fixed to the proximal end of the injection needle and being connected to the connecting portion of the injection barrel; a gasket provided liquid-tightly and slidably in the injection barrel, the gasket having a distal end and a proximal end; a plunger being connected to the proximal end of the gasket, the plunger having a distal end and a proximal end and being rotatable in the injection barrel; joining means provided at the distal end of the gasket or the distal end of the plunger; and joined means provided at the proximal end of the needle base;
the safety syringe further comprising a joint preventing means, which prevents only movement of the plunger toward the distal end of the injection barrel and allows movement of the plunger toward the proximal end of the injection barrel, whereby the joining means and the joined means are prevented from being joined unintentionally before use, and are allowed to be joined to each other when in use, the joint preventing means including an engaging portion provided in an interior of the proximal end of the injection barrel and an engaged portion provided at a midsection of the plunger, and the engaging portion and the engaged portion being engaged before use and disengaged during use; wherein the engaging portion provided in the interior of the proximal end of the injection barrel is an engaging rib provided on a portion of an inner wall of the injection barrel and the engaged portion is a proximal end of an L-shape vertical rib provided on the plunger, the L-shaped vertical rib being engaged with the engaging rib in a first position of the rotatable plunger prior to use and disengaged with the engaging rib in a second rotated position of the rotatable plunger during use.

Assignees

• Sano Minoru
• Hama Yoshihisa
• Nipro Corp

Inventors

• Sano Minoru
• Hama Yoshihisa

Classifications

• A61M5/31501

  Means for blocking or restricting the movement of the rod or piston (A61M5/5013 takes precedence) · CPC title

• A61M2005/5073

  by breaking or rupturing the connection parts · CPC title

• A61M2005/31508

  provided on the piston-rod · CPC title

• A61M5/31505

  Integral with the syringe barrel, i.e. connected to the barrel so as to make up a single complete piece or unit · CPC title

• A61M5/322 Primary

  Retractable needles, i.e. disconnected from and withdrawn into the syringe barrel by the piston (devices for protecting guide needles in combination with catheters A61M25/0612) · CPC title