Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1993-03-10
1994-08-09
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604242, 604258, 433 88, A61M 531
Patent
active
053362020
DESCRIPTION:
BRIEF SUMMARY
This application is a PCT application.
The present invention relates to equipment for syringes for spraying mixtures of fluids as used, in particular, in dentistry.
At the present time, in order to spray a mixture of air and of water onto the site of the dental operation, or one of the two fluids alone, use is made of equipment consisting of a syringe (of various models) and of corresponding cannulas whose free end is introduced into the patient's mouth. These cannulas, which are reusable, are of course soiled while being used, and it is essential to sterilise them after use.
However, the trend in the medical field in general, and in the dental field in particular, is to employ disposable instruments and tools in order, on the one hand, to do away with the need for laborious sterilisation after each use and, on the other hand, to give a sense of security to the patient--and in some cases the attendant personnel--fearing contamination from previously soiled instruments.
Equipment has already been proposed, which consists of a metallic adaptor having, viewed in the direction of flow of the fluids, an upstream end which can be connected to the syringe and a downstream end which can be connected to a disposable cannula, the said cannula defining at least two fluid-distribution channels which extend side by side, and the said adaptor comprising a corresponding number of supply channels which can be brought into correspondence, for communication of fluid, with the said distribution channels.
Thus, FR-A-2 639 534 HEUILLON proposes equipment comprising a disposable cannula, of which the constituent material is not specified, and an adaptor. Two supply channels of circular cross-section are formed side by side in the solid material of the adaptor, which also has a circular cross-section, but one which is considerably larger than that of the supply channels. For its part, the cannula has two distribution channels defined by a cavity of circular cross-section decreasing rapidly from upstream to downstream and divided diametrically by a partition, in such a way that the distribution channels have a substantially semicircular and decreasing cross-section. Upstream of the partitioned cavity, the cannula defines a socket designed to receive the downstream end of the adaptor. This downstream end is slotted in a diametral plane equidistant from the two supply channels, the purpose of the slot being to accommodate the abovementioned partition when the cannula is fitted onto the adaptor.
Such a device has a number of disadvantages, most of which are associated with the considerable difference in flow cross-section between the downstream end of the supply channels and that, more than fifteen times larger, of the upstream end of the distribution channels.
The results are that: and their discharge at the end of the cannula is irregular; in the cannula, so that, when the practitioner cuts off the supply of water, the flow does not stop immediately and the cannula drips; for the same reason, if the practitioner changes from spraying water to spraying air, for example in order to dry a composite substance, the air, due to the Venturi effect, aspirates the residual water in the neighbouring channel, and it is humid air which is directed onto the preparation to be dried.
In addition, the turbulence effect mentioned above, on account of the forces resulting therefrom, risks causing the untimely disconnection of the cannula and the adaptor.
Finally, it is fairly unlikely that the proposed cannula could be made of moulded plastic material, since it is difficult to see how the demoulding would be carried out.
Another solution has been proposed in WO90/07912 SEGAL. This time, the supply channels of the adaptor and the corresponding distribution channels of the cannula are not juxtaposed side by side, but instead are coaxial. The manufacture of such cannulas is all the more complicated by the fact that it is intended to provide them with a bayonet socket for their connection to the adaptor, with a view to preventing the disconnection ment
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Bailly Alain
Ramsteiner Gerard
Saurou Michel
Adams, III W. Thad
Rosenbaum C. Fred
Wilkens Frank
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