Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1997-02-26
1999-09-28
McDermott, Corrine
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604110, 604195, 604187, 604232, A61M 5315
Patent
active
059578971
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to hollow needle applicators suitable for administering cartridged drugs etc.
In using the term "drugs etc" herein, there is no intention to limit application of this invention to drugs as such, even to antidote substances. This invention is seen as generally applicable to any usefully injectable substance; and to doing so into any appropriate receiver, i.e. whether or not that is tissue of a human or even animal subject.
BACKGROUND ART
Dangers of infection and cross-infection, much high-lighted by the spread of AIDS, mean there is a need for hollow-needle devices as drugs etc applicators with automatic retraction and designed for single use only, i.e. designedly not lending themselves to re-use. This is, perhaps, particularly the case for cartridged drugs etc supplied as a one-dose item complete with applicator. Indeed, there have been many proposals over the years for such applicators, especially recently, but most are of doubtful practicality or of complex and costly construction, even both. We have, ourselves, made basic proposals (PCT application GB92/00652) for practical and low-cost single use hypodermic syringes (and body-fluid samplers) with automatic needle retraction on release of integral internal latching of an outer body part for a needle holder, including usable with cartridged drugs etc by use of a plunger element to release the needle holder latching after cartridge discharge.
We have made further proposals (PCT application no GB93/01004) for preloaded cartridged drugs etc applicators affording automatic needle retraction, including self-powering provisions for automatic needle extension before discharge of cartridge contents and needle retraction, and having deflectable angled piston rod arms for temporary drive stroke latching and then release deflection by cartridge engagement.
DISCLOSURE OF THE INVENTION
Objects of aspects of this invention include making further advantageous proposals for preloaded cartridged drugs etc applicators. Specifically, we are looking at achieving or improving one or more of certainty and/or reliability of operation and greater facility for automatic assembly.
The importance of certainty and/or reliability of operation for of drugs etc applicators is believed to be self-evident. However, it is also a matter of fundamental importance to facilitate automatic assembly; otherwise the essentials (for commercial success) of high production volumes at low unit cost will not be achievable.
According to one aspect of this invention, there is provided a hollow needle applicator for cartridged drugs etc having provision for automatic needle retraction after cartridge contents expression, wherein its drugs etc cartridge can itself be at least partially accommodated bodily within a hollow piston actuator and will be released for retraction under bias thereinto along with and by way of a piston rod first serving to operate contents discharge piston provision of the cartridge, the piston rod having deflectable arms that extend sideways further than side walling of the cartridge and into temporary driving engagement with receiving formation(s) of the piston actuator until released by deflection of the arms, wherein the piston rod further has guiding formation(s) always extending into the hollow piston actuator.
At least, indeed particularly but not necessarily exclusively, for assembly of more complex self-powering applicators with needle extension before discharge and retraction, it is further preferred that the guiding formation(s) further have temporary latching provision(s) relative to the hollow piston actuator.
This guidance aspect of this invention, including with said temporary latching, contributes substantially to facilitating automatic assembly, at least in connection with first associating the piston rod with the piston actuator, and whether or not for the purpose of further handling thereof as a sub-assembly. Moreover, as will become clear later herein, there are at least potential design and/or dimensional specifica
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McDermott Corrine
Nath Gary M.
Novick Harold L.
Rodriguez Cris L.
Safe-T-Limited
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