Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1987-09-14
1989-05-30
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604 85, 222135, A61M 508
Patent
active
048347140
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a syringe for medical use.
FIG. 1 schematically shows a conventional syringe for medical use. This syringe includes a compartment 1 into which the liquid to be injected is introduced. This compartment is bordered by an exterior cylinder 2, by a partition 3 that closes off the cylinder at its first extremity, and by a piston 4 that slides into the cylinder 2. In the partition 3 is provided an opening with a tip 5 to which the needle or catheter to be used for injection or sample taking is attached.
In order to operate the syringe, an axial rod 6 is attached to the piston 4, the extremity of this rod being linked to either a circular plate or flanges 7, the flanges 8 being also provided at the extremity of the cylinder 2 opposite the partition 3. The flanges or circular plates 7 and 8 are shaped in such a way as to allow one to simply pull on the plate or flanges 7 without being hindered by the other plate or flange 8, thus ensuring a grip that allows the fingers to push the piston 4 by means of the rod 6.
Conventionally, radial wings are attached to the rod 6, for example three or four wings, that start at this rod 6 and come into sliding contact into the inner wall of the cylinder 2 to ensure that the piston 4 does not slant and remains perpendicular to the axle of the cylinder during its shift.
Such syringes are either manufactured in a sterile environment or they are sterilized during the last stage of their production. They are sold wrapped, the piston 4 being completely pushed down to come in contact with the partition 3. Different types of gaskets 9 can ensure the tightness between the piston 4 and the inside of the cylinder 2. The gaskets have any suitable form, for example U-shaped gaskets, or quite simply, the friction between the plastic material composing both the piston 4 and the cylinder 2 will ensure a tight fit.
In this manner, during use, the piston 4 will be separated from the partition after a needle or catheter has been attached to the tip 5 and the compartment 1 will be gradually filled by either the injection or the sample liquid. In order to avoid errors in handling, there is usually provided a retaining ring (not shown) that limits the movement of the piston 4 to the inside of the cylinder 2, this retaining ring being positioned in such a way that the compartment 1 will hold a predetermined volume, for example five or ten cubic centimeters, when the piston 4 falls against the retaining ring.
A whole range of disposable syringes are usually marketed together, each syringe having a determined capacity. For the pratictioner, doctor, or nurse, the prior art design results in the necessity of having at their disposal a relatively large stock of syringes corresponding to the injections or the sample taking that they are likely to perform between two purchases. This drawback is particularly evident in the case of those doctors, nurses or veterinarians who go on rounds and are obliged to load themselves up with a large number of syringes in order to face all the situations which they can find themselves confronted with during their day. The drawback is, of course, even more pronounced for those doctors and nurses who must go on long stays in the bush without being resupplied for relatively long periods of time.
Another drawback of the conventional syringes as shown in FIG. 1 is that, as we see in the figure, the volume of the injection or sample is limited by the diameter of the cylinder and the passage of the piston. For those syringes that hold a large capacity, for example one hundred cubic centimeters or more, it is already a matter of syringes of considerable diameter for which the passage of the piston is long, rendering the syringes cumbersome, difficult to manipulate, and not convenient for the syringue-pusher devices.
An object of the invention is to provide for syringues overcoming the drawbacks of the prior art.
For achieving this objective and others, this invention provides for a double compartment syringe comprising a first compartment constitute
REFERENCES:
patent: 1234582 (1916-07-01), Trueblood
patent: 1600587 (1926-09-01), Hein
patent: 2841145 (1958-07-01), Epps
patent: 2939459 (1960-06-01), Lazarte et al.
patent: 3437242 (1966-04-01), Poitras
patent: 3749084 (1973-07-01), Cucchiar
patent: 4029236 (1977-06-01), Carson et al.
patent: 4050612 (1977-09-01), Stone
patent: 4220261 (1980-09-01), White
patent: 4655747 (1987-04-01), Allen
Charpentier Jacques
Lascar Marcel
Polutta Mark O.
Rosenbaum C. Fred
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