Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1994-05-19
1996-03-12
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604192, 604197, 604263, 128919, A61M 532
Patent
active
054982456
DESCRIPTION:
BRIEF SUMMARY
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 and shall include within its scope a syringe, a cannula, hypodermic needle, intravenous infusion line and the like devices.
The parenteral device according to the invention relates to one in which the needle body which incorporates a needle is slidably supported in the body of the device to be movable between a first position at which the needle body and needle are fully accommodated within the body to be inaccessible and a second position at which the needle is caused to extend beyond the body whereby on the needle being moved to the second position it is in communication with a cheer or duct to or from which fluid can be transferred through the needle.
A difficulty which exists in relation to any form of parenteral device which incorporates a needle relates to the danger of inadvertent pricking of the user or another person during the assembly and utilisation of the device and its subsequent disposal.
Furthermore, while devices are available which provide for a retractable needle such devices are specialised.
It is an object of this invention to provide a parenteral device of the form described above where once the parenteral device has been used the needle can be withdrawn to be inaccessible. Furthermore it is an object of the invention to provide a device which can be used with existing parenteral devices.
Previously syringes have been proposed which incorporate retractable needles, however the interrelationship between the components of the syringe have resulted in a variety of complex arrangements. These forms of retractable syringe have been found to be of limited acceptability because of their complexity and consequent cost of manufacture.
Another arrangement is disclosed in EP 0479303 and comprises a retractable device which is to be attached to a specially modified syringe. The attachment accommodates a retractable needle. This device however requires that the needle be in an extended position prior to its use and on completion of the stroke of the plunger of the syringe the needle is irretrievably retracted into the body of the attachment. As a result the device does not avoid the possibility of an accidental "stick" injury or contamination prior to being used. This necessitates the utilisation of some form of protective cover for the needle prior to its use. In addition there are circumstances where it is not desirable to have the needle retract immediately on the plunger of the syringe completing its stroke in the syringe. In addition, less than careful operation of the device can lead to the inadvertent retraction of the needle which can itself be dangerous. Furthermore it is frequently necessary to remove the contaminated needle from the patient before the plunger has completed its stroke in the syringe so the need for retraction operated by the plunger is ineffective in such circumstances.
It is an object of the invention to provide an attachment which can be used with a conventional parenteral device and which enables a needle to be mounted to the parenteral device which can be extended and retracted in a controlled manner as required by the user.
In one form the invention resides in an attachment to a parenteral device where the parenteral device comprises a body having a duct which is to convey a parenteral fluid, said duct having a first opening at its outer end, said attachment comprising a housing adapted to be removably engagable with the body and to be rigidly supported by the body when in engagement therewith, a hollow needle body slidably supported within a passageway provided in the housing and comprising a hollow needle having a free end; said needle body being movable between a first position at which the free end is received within the housing and a second position at which the free end extends from the housing, and said needle body being movable from the second position
REFERENCES:
patent: 4941883 (1990-07-01), Venturini
patent: 4994042 (1991-02-01), Vadher
patent: 5000167 (1991-03-01), Sunderland
patent: 5037402 (1991-08-01), Bartman
patent: 5222947 (1993-06-01), D'Amico
patent: 5263942 (1993-11-01), Smedley et al.
patent: 5267973 (1993-12-01), Haber et al.
patent: 5300038 (1994-04-01), Haber et al.
patent: 5356395 (1899-10-01), Chen
Eastland Technology Australia Pty Ltd
Gring N. Kent
Rosenbaum C. Fred
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