Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1994-12-14
1996-11-12
McDermott, Corrine M.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604263, 128919, A61M 532
Patent
active
055735134
DESCRIPTION:
BRIEF SUMMARY
This invention relates to syringe systems.
After use of a syringe to perform an injection or take up a sample of blood from a patient, there is a risk that doctors or nurses will accidentally prick themselves with the needle of the syringe. This phenomenon is known as "needle stick" and can be highly dangerous due to the risk of transfer of blood-related diseases.
European Patent Specification No. 0268445 discloses a fitment for a syringe in the form of a two-part protective sleeve which surrounds the needle and which, together with the needle, is connectable to, and disconnectable from, the needle connector of the syringe barrel in place of a conventional needle. The sleeve has two sleeve parts which are movable relative to one another from a contracted position, in which the point of the needle projects from the sleeve to an extent to enable an injection to be effected, to an extended position, in which the point of the needle is located within the sleeve to shield the point of the needle. During such movement the two sleeve parts are guided relative to one another by a projection engaging in a track, and a compression spring within the sleeve ensures that the sleeve automatically assumes its extended position, and is locked in that position, after withdrawal of the needle from the patient.
Such a fitment is extremely effective in guarding against needle stick as it ensures that the point of the needle is shielded immediately after withdrawal from the patient without any need for operator action. Furthermore the fitment may be disposed of after use without any danger of the point of the needle being re-exposed. Similar advantages are obtained in use of the syringe fitments disclosed in European Patent Specification No. 0367398. However such fitments are in the form of sealed units incorporating needles, and it is not possible for conventional needles to be fitted to such units or for the units to be fitted to pre-filled syringes or pre-filled cartridge systems in which the needle is either supplied fitted to the barrel or in a common pack for fitting to the barrel. Also the sleeve is initially held in a partially contracted position in which only the tip of the needle is exposed when supplied for use, the sleeve being subsequently moved back by contact with the patient's skin as the needle is introduced into the patient, and this can render the fitment unsuitable for certain applications in which particularly accurate location of the needle at an injection site is required or in which it is necessary for injectate to first be drawn into the syringe by inserting the needle into an injectate bottle or vial.
It is an object of the invention to provide a novel form of syringe system which guards against needle stick and which is capable of being used in a number of applications for which the above-described fitment is unsuitable.
According to the present invention there is provided a syringe system as defined by the accompanying claims.
The protective sleeve of such a syringe system can be temporarily held in the retracted position by the second retaining means in order to enable accurate location of the tip of needle at an injection site or to enable introduction of the needle into an injectate bottle or vial. Since the sleeve is retained in the contracted position away from the tip of the needle during location of the needle, rather than being held in contact with the patient's skin as in the prior arrangement, sensitive control is obtained during location of the needle. Furthermore, after the point of the needle has been located in a patient's vein, the action of depressing the plunger to deliver the required dose of injectate automatically results in release of the second retaining means so as to cause the sleeve to be moved to the extended position under the action of the biasing means and to be retained by the first retaining means in the extended position in which it shields the point of the needle. Such a shielding action is automatically initiated by the action of delivering the injection dose, so t
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patent: 5106379 (1992-04-01), Leap
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patent: 5135514 (1992-08-01), Kimber
patent: 5169392 (1992-12-01), Ranford et al.
patent: 5176656 (1993-01-01), Bayless
patent: 5282793 (1994-02-01), Larson
McDermott Corrine M.
Rodriguez Cris L.
Sterimatic Holdings Limited
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