Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1995-01-18
1996-10-08
Green, Randall L.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604110, 604 89, A61M 532
Patent
active
055626351
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an improved parenteral device.
BACKGROUND OF THE INVENTION
Throughout this specification the term "parenteral device" shall be taken to include any device which can be used for the conveyance of parenteral fluids which are to be introduced into or drawn from the body through the skin and shall include within its scope a syringe, a cannula, a hypodermic needle, an intravenous infusion line, and like devices.
A primary characteristic of parenteral devices is the provision of a sharp hollow needle to facilitate the transfer of fluids to or from the body. The difficulty created by the presence of such a needle arises from the possibility of injury which may be caused to a user or to medical staff when using the device, or indeed to any person who may be required to handle the device before or after use.
Of course, the injury itself does not represent the major concern; the major concern arises from the dangers of infection from such injuries due to the presence of pathogens which may be present on the needle as a result of its use. Indeed, it has been proven that a number of viral infections, notably the HIV virus and hepatitis B, can be transmitted by the reuse of needles previously used to inject an infected individual.
These dangers have resulted in the development of very careful and sometimes detailed disposal procedures being adopted in institutions where such parenteral devices are used. It has also resulted in attempts being made at developing single use parenteral devices that are not capable of being reused.
However, the disposal procedures adopted by such institutions are not able to be enforced in out-of-clinic situations, such as those situations where individuals inject recreational drugs. Further, the users of recreational drugs are often capable of quite easily manipulating a so called "one use" syringe to be able to continue using that same syringe.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an improved parenteral device wherein operation of the device in performing an injection alters the configuration of the device such that the device becomes extremely difficult to refill and also to reuse. A further object is to provide a parenteral device having a needle that retracts so as not to be exposed after use.
The present invention provides a parenteral device comprising a body having a forward end and a rearward end, the forward end being capable of receiving a hollow retractable needle therein so as to project therefrom, the retractable needle being slidable relative to the body, the body also including a chamber capable of receiving parenteral fluid and capable of being reduced in volume to expel fluid contained therein, wherein the needle is capable of being manually retracted within the body such that the chamber reduces in volume to expel fluid contained therein and such that the needle is retracted to be wholly contained within the body.
The retractable needle is preferably mounted in a plug, the plug being configured so as to sealingly engage with the internal walls of the body but to be slidable relative thereto. The chamber is preferably located rearwardly of the plug such that the needle then projects through the plug to provide fluid communication with the chamber at the rear thereof and the hollow interior of the needle.
Thus, by actuating the parenteral device to slide the plug towards the rear of the body, the volume of the chamber is reduced and fluid is expelled therefrom through the hollow needle. At the same time, the needle itself is retracting within the body. With this mode of operation, the parenteral device is preferably configured such that the full dose of parenteral fluid to be injected below the skin has been delivered before the sharp end of the needle is removed from below the skin. Preferably the full dose has been delivered prior to the sharp end of the needle retracting to a depth of about 5 mm below the skin.
Indeed, by holding the body of the parenteral device closely adjac
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Alexander V.
Eastland Technology Australia Pty Ltd
Green Randall L.
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