Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1987-05-29
1989-01-17
Pellegrino, Stephen C.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604125, 433 90, A61C 504
Patent
active
047985968
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a disposable applicator syringe for a dental compound, with a syringe body enclosing a cylindrical space and tapering into a thin discharge tube, and with a piston displaceable in the cylindrical space, in the state of rest the cylindrical space receiving the dental compound in a front portion and the piston in a rear portion.
It is customary for the dentist to pick up the separately mixed dental compound by means of a re-usable syringe which ends in a thin discharge tube and which contains a displaceable piston, in order to apply it by means of this syringe (GB-A-No. 734,983 and U.S. Pat. No. -A 4,184,490) This operation is complicated, especially since the syringe has to be cleaned and sterilized after each use.
Applicator syringes intended for once-only use and containing mercury and silver filings in separate chambers have therefore been developed, these components being mixed in the syringe itself (German Offenlegungsschrift No. 2,903,331); but these syringes have proved inappropriate, because there are difficulties in storing the mercury in a sealed manner and combining the components in exact quantities and mixing them completely.
The principle of the so-called disposable syringes was first adopted successfully in connection with photosetting single-component filling compounds contained in syringe-like applicator cartridges. These comprise a syringe body with a cylinder displaceable in it, and a curved discharge tube. Since the force exerted to displace the piston in the syringe body is considerable, to use it a tool, for example of tong-like or pistol-like design, is required (German Auslegeschrift No. 12,045,509, German Offenlegungsschrift No. 2,110,463, German Offenlegungsschrift No. 3,235,232 and U.S. Pat. No. 4,391,590). The need for a special tool is a disadvantage, especially since it could come into contact with the patient's mouth and would have to be sterilized. The production of these disposable syringes involves a high outlay, because the curved shape of the discharge tubes for forming the cavity require a multi-part core of complicated construction. Another disadvantage of this type of production is that the curved discharge tube can only be relatively short.
Applicator syringes for single-component filling compounds, which have a large holding capacity and which are intended for repeated use, are also known (German Offenlegungsschrift No. 3,212,187). These too should be sterilized before each use, but this is scarcely possible because they are in a filled state.
The object on which the invention is based therefore, is to provide an inexpensive disposable applicator syringe which can be employed without a tool, but which nevertheless ensures hygienic use. Furthermore, the object on which the invention is based is to provide a simple process for producing such an applicator syringe with a curved discharge tube which can be of any length.
In the solution according to the invention, the syringe body and the piston designed as a rod are made thin, in particular with a ratio of the effective stroke to the diameter of the cylindrical space and the syringe piston of at least approximately 10, and the diameter of the piston is less than the diameter in the rear portion of the cylindrical space.
The invention, to provide an applicator syringe designed as a whole for once-only use, had to overcome two difficulties. One is that the force required to propel the piston must be so low that there is no need for a special tool. The other is that, because of the need for competitiveness in the field of small and simple applicator capsules, the outlay in terms of production must be kept very low, so that it is possible to compete with the applicator capsules mentioned above.
Because of the choice of an unusually small piston diameter which is appropriately no greater than approximately 10 or preferably 7 mm.sup.2, the force required to expel the compound from a nozzle orifice of predetermined size is reduced considerably. Although the small piston diameter results in a considerab
REFERENCES:
patent: 1654905 (1928-01-01), Voos
patent: 2756747 (1956-07-01), Axelrad
patent: 3262608 (1966-07-01), Macey
patent: 3581399 (1971-06-01), Dragan
patent: 3809298 (1974-05-01), Harris, Sr. et al.
patent: 3827147 (1974-08-01), Condon
patent: 3918355 (1975-11-01), Weber
patent: 4184490 (1980-01-01), Jacklich
patent: 4266557 (1981-05-01), Merry
patent: 4354507 (1982-10-01), Raitto
patent: 4470505 (1984-09-01), Korwin et al.
patent: 4551135 (1985-11-01), Gorman et al.
patent: 4617918 (1986-10-01), Donohue et al.
patent: 4619613 (1986-10-01), Dragan
Lewis Ralph
Pellegrino Stephen C.
LandOfFree
Applicator syringe for a dental compound does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Applicator syringe for a dental compound, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Applicator syringe for a dental compound will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2412610