Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1997-11-07
2000-08-15
Stright, Jr., Ronald K.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604111, 604198, 604263, A61M 500
Patent
active
061028932
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a "vial-syringe" type medical device. In particular, the invention relates to a disposable prefilled syringe that is ready to be used.
Patent application No. WO-A-93/02728 describes such a conventional device having a tubular body, a nosepiece for a hollow needle, a sliding piston, a protective cover, a protective cap, and inviolability means. The tubular body may be transparent and contains the medicinal liquid that is to be injected in a patient. The nosepiece for the hollow needle communicates with the inside of the tubular body. A sliding piston is provided within the tubular body and is arranged in a predetermined position with respect to the tubular body opposite the nosepiece. The outside extremity of the sliding piston can be actuated by the user, while the inside extremity of the piston forms an internal space with the rest of the tubular body that is partially filled with a dose of the medicinal liquid. The protective cover is coaxial to and placed in a sliding manner on the tubular body and is of sufficient length to completely cover the needle in a protruding position after the injection is performed. The protective cap is positioned in a retractable manner on the front of the tubular body and protects at least the nosepiece of the tubular body. The inviolability means, in particular, is a low resistance, ring-shaped rip line.
A drawback of the above-described device is that it is possible to reuse the syringe by reinserting a new cartridge, which is detrimental in terms of safety and limits the field of application.
Pursuant to U.S. Pat. No. 4,747,837, a similar device is described but has a syringe that is not prefilled and the cap provided inside of the cover at the nosepiece of the body is held by means of friction rather than by inviolability means. This device is also provided with blocking means for the cover in its protruding position impeding any ulterior use. It is possible, however, to move the cover towards the front and to block it inadvertently, thus rendering the device unusable.
BRIEF SUMMARY OF THE INVENTION
The object of this invention is a device such as described above, incorporating inviolability means that concurrently ensures the imperviousness of the nozzle of the syringe against any contamination and protects the injection needle against any accidental pricking once the device has been used.
Another object of this invention is to solve the problems of the above-described devices by providing a single use disposable syringe device for medical use that assures the imperviousness of the device is not violated.
Furthermore, this invention also has the object of providing a device that compels the user to follow a certain procedure, thereby preventing any erroneous handling of the device because of the ergonomics of the device's construction.
In accordance with this invention, the cap is provided at its base with an annular retainer ring held in a permanent manner to the tubular body on the side of its nosepiece and attached to the rest of the cap by the inviolability means. The cap being designed with respect to the cover in such a manner that the cap blocks any sliding movement of the cover and remains in the retracted position while the cap is not separated from the tubular body. To achieve this, by way of example, the cap may be joined to the cover by the inviolability means. The retainer ring may also be fitted or arranged with respect to the cover so as to prevent the sliding movement of the cover in its protruding position.
Because of the design of this invention, it is impossible to change the sequence of the steps for its use and thereby prevents the reuse of the syringe.
Furthermore, blocking means for the cover in either the retracted and protruding positions can be provided between the tubular body and the cap.
In a preferred embodiment of this invention, the device comprises a hollow injection needle placed in the nosepiece of the tubular body. The cap can be of sufficient length to completely protect the
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Biodome
Stright Jr. Ronald K.
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