Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Reexamination Certificate
2000-06-26
2001-03-13
Yasko, John D. (Department: 3763)
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
C604S187000
Reexamination Certificate
active
06200291
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a device for controlling the penetration depth of a needle, for application to an injection syringe.
As is known, several substances are conventionally injected into the human body, for example intracutaneously, i.e. by injections which affect substantially only the surface layer of the human derma.
In particular, for performing the above mentioned injections, it is necessary to cause a syringe needle to enter for a limited length the patient derma.
On the other hand, as prior syringes are used for the above mentioned application, it is difficult to obtain a proper penetration depth of the needle, since this penetration depth substantially depends on the manual skillness of the operator.
In this connection, it should be apparent that an excessive penetration of the syringe needle would originate a disagreable pain feel for the patient, while preventing the injected substance from being properly absorbed.
A further aspect to be considered is that intradermal injection treatments, such as, in particular, those of a dermatological type, would require a comparatively high number of intradermal or intracutaneous injections, thereby the above mentioned problems will recursively occur.
SUMMARY OF THE INVENTION
Accordingly, the aim of the present invention is to provide a device for controlling or adjusting the penetration depth of-a syringe needle, which is specifically designed for application to an intradermal injection syringe, which allows the injections to be performed in an optimum manner.
The above aim is achieved by the present invention providing a device for controlling the penetration depth of a needle, for application to an injection syringe, characterized in that said device comprises a skin contacting element, said skin contacting element including a surface encompassing, at least partially, the tip of said needle, and in that said skin contacting element is operatively associated with coupling means for connection with said syringe.
According to a preferred embodiment of the present invention, the skin contacting element comprises an end tapering portion ending with the above mentioned surface.
Preferably, said surface has a spherical cap configuration and has its concavity facing the needle tip.
Moreover, the needle tip projects for a short length from said surface.
According to a further preferred embodiment of the present invention, the mentioned end tapering portion is provided with a plurality of throughgoing holes passing through said surface.
According to a further preferred embodiment of the invention, the means for coupling the skin contacting element and syringe comprise an outer cylindric body ending with said tapering portion and an inner cylindric body, substantially coaxial to the outer cylindric body supporting the syringe needle.
Finally, the inner cylindric body comprises a circular rim or edge, opposite to the end portion the needle tip projects from, and the circular rim or edge is arranged inside the outer cylindric body.
The invention provides the following advantages, with respect to the prior art.
Firstly, the device according to the present invention allows to accurately adjust the needle penetration depth, without the need of performing manual controlling operations by the operator.
Secondly, the provision of throughgoing microholes or any other throughgoing holes, through the end tapering portion of the device, allows to prevent any suction effect due to the pressure difference between the inside of the tapering portion and the outer atmospheric pressure, thereby allowing air to outflow.
Thus, the syringe will be prevented from adhering to the skin of the patient by its end tapering portion, which would compel the operator to forcibly detach the syringe from the patient.
This suction cup effect would be particularly dangerous in all those cases in which the medical treatment provides a plurality of subsequent injections.
Moreover, the use of a suitably contoured surface, to be slightly pressed against the skin of the patient, will allow to sensitize the region encompassing the needle puncture region, thereby the slight pain feeling affecting the patient during the intradermal injection will be further diluted or reduced, to assure, mainly in a case of a plurality of subsequent injections, a greater pain release for the patient.
Finally, the device according to the present invention can be easily constructed by using easily commercially available elements and materials and, moreover, said device can be used with existing syringes.
REFERENCES:
patent: 1934046 (1933-11-01), Demarch
patent: 4769003 (1988-09-01), Stamler
patent: 4898588 (1990-02-01), Roberts
patent: 4978344 (1990-12-01), Dombrowski et al.
Hedman & Costigan ,P.C.
Yasko John D.
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