Hollow needle applicator for cartridged drugs
First Claim
1. A hollow needle applicator for cartridged drugs etc of a type affording automatic needle retraction after cartridge contents expression, the applicator comprising a hollow elongate body having a top portion and bottom portion and that, at least in operation, housesa hollow drugs etc cartridge biased toward the bottom portion of the body and having side walling slidable in the body and a discharge piston with a piston rod extending out of the cartridge as such longitudinally of the body, anda hollow piston actuator biased toward the top portion of the body and slidable in the body and capable of at least partially bodily accommodating the cartridge as well as the piston rod,the piston rod having deflectable arms that extend sideways further than the side walling of the cartridge, the piston actuator having receiving formations with which the deflectable arms make temporary driving engagement until the deflectable arms are engaged and released during bias driven movement of the piston actuator toward the bottom portion of the body before a bias driven movement of the cartridge toward the bottom portion of the body, and the piston rod having a guiding formation extending into the hollow piston actuator.
1 Assignment
0 Petitions
Accused Products
Abstract
A hollow needle applicator for cartridged drugs etc has provision for automatic needle retraction after cartridge contents expression. Its drugs etc cartridge (125, 225, 325) can itself be at least partially accommodated bodily within a hollow piston actuator (145, 345), and will be released for retraction under bias (123, 3230 thereinto along with and by way of a piston rod (132, 332) first serving to operate contents (131, 331) discharge piston provision (130, 330) of the cartridge (125, 225, 335). The piston rod (132, 332) has deflectable arms (137, 337) that extend sideways further than side walling of the cartridge (125, 225, 335) and into temporary driving engagement with receiving formation(s) (147, 347) of the piston actuator (145, 345) until released by deflection of the arms (137, 337). The piston (132, 332) rod further has guiding formation(s) ((138, 338) extending into the hollow piston actuator (145, 345). The guiding formations (138, 338) and piston actuator (145, 345) are shown with temporary latching provisions (138P, 145G). A triggering ring (160) is also shown for releasing driving connection between the arms (137, 337) and the receiving formations (147, 147).
-
Citations
19 Claims
-
1. A hollow needle applicator for cartridged drugs etc of a type affording automatic needle retraction after cartridge contents expression, the applicator comprising a hollow elongate body having a top portion and bottom portion and that, at least in operation, houses
a hollow drugs etc cartridge biased toward the bottom portion of the body and having side walling slidable in the body and a discharge piston with a piston rod extending out of the cartridge as such longitudinally of the body, and a hollow piston actuator biased toward the top portion of the body and slidable in the body and capable of at least partially bodily accommodating the cartridge as well as the piston rod, the piston rod having deflectable arms that extend sideways further than the side walling of the cartridge, the piston actuator having receiving formations with which the deflectable arms make temporary driving engagement until the deflectable arms are engaged and released during bias driven movement of the piston actuator toward the bottom portion of the body before a bias driven movement of the cartridge toward the bottom portion of the body, and the piston rod having a guiding formation extending into the hollow piston actuator.
-
15. A hollow needle applicator for cartridged drugs etc which affords automatic needle retraction after cartridge contents expression, the applicator comprising a hollow elongate body having a top portion and a bottom portion and that, at least in operation, houses
a hollow drugs etc cartridge biased toward the bottom portion of the body and having side walling slidable in the body and a discharge piston with a piston rod extending out of the cartridge as such longitudinally of the body, and a hollow piston actuator biased toward the top portion of the body and slidable in the body and capable of at least partially bodily accommodating the cartridge as well as the piston rod; the piston rod having deflectable arms that extend sideways further than the side walling of the cartridge, the piston actuator having receiving formations with which the deflectable arms make temporary driving engagement until the deflectable arms are engaged and released during bias driven movement of the piston actuator toward the bottom portion of the body before bias driven movement of the cartridge toward the bottom portion of the body, and a triggering ring about the cartridge to serve in first engaging the deflectable arms to initiate retraction of the cartridge and piston rod after cartridge contents expression. - View Dependent Claims (16, 17, 18, 19)
Specification