Surgery – Means for introducing or removing material from body for... – Treating material applied to or removed from external...
Patent
1990-08-08
1994-05-03
Green, Randall L.
Surgery
Means for introducing or removing material from body for...
Treating material applied to or removed from external...
604295, 604186, 604211, A61M 3500, A61M 5178, A61M 500
Patent
active
053083431
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns an application device for the local deposition of a liquid substance onto a surface to be treated, particularly a medicinal solution onto a cutaneous surface for a dermatological treatment, this device having an elongated tubular element comprising an internal cavity, a micrometric-screw dosing mechanism, and a distribution tip provided with a capillary conduit communicating with the interior surface, the micrometric-screw dosing mechanism being designed to allow the volume of the internal cavity to be altered.
The dermalotogical treatment known as topical, by means of medicinal substances deposited onto the surface of a diseased skin, is normally carried out by means of brushes or applicators made of glass or of a synthetic material. The end of these applicators is often rounded in the form of a spatula with the aim of depositing the treatment solution onto the diseased skin. Sometimes these devices are replaced by glass tubes of small diameter comprising a capillary conduit, forming a sort of pipette.
These known devices have shown themselves to be inefficient or inadequate for the treatment of warts, actinic or seborrheic keratoses, acuminate condyloma or of certain skin cancers. In effect, with these devices the physician is practically incapable of precisely dosing the therapeutic substances to be used, and to apply them to the skin. Following on from this, these means of application are shown to be impractical and in particular, imprecise in use.
Applicators based on the principle of microcapillarity have specific drawbacks due to the fact that they develop an oil film at the interior of the capillary tube, which has to be rinsed with alcohol before use. This means that the pipette type of applicator is complicated, impractical and requires a relatively important preparation time before any application operation can actually be carried out.
The present invention proposes to obviate these various drawbacks by proposing an application device such as mentioned above, which is easy to use, of simple conception and structure and which allows a precise dosing of the therapeutic solution, together with a great precision in application of this solution onto the cutaneous surface to be treated.
Towards this end, the application device according to the invention is characterised in that the internal cavity contains at least one supple pocket containing a determined volume of gas, and in that the micrometric-screw dosing mechanism comprises a mobile element designed to compress to a greater or lesser extent, the said supple pocket so as to allow the volume of the said internal cavity to be altered.
According to a preferred embodiment, the supple pocket is open at one of its ends and communicates with the said capillary conduit by means of this end.
According to another embodiment, the supple pocket is closed.
In both cases, the supple pocket may be either a teat with smooth walls, or a teat with accordion-pleated walls.
According to another embodiment, the device comprises a first supple pocket lodged in the internal cavity of the elongated tubular element and a second pocket lodged in the distribution tip.
According to a particularly useful embodiment, the distribution tip is prefilled and contains the liquid substance to be deposited locally on the surface to be treated.
According to an interesting embodiment, the liquid substance to be deposited locally on a surface to be treated is contained in the said supple pocket.
For the case where the tubular element comprises two supple pockets, these may be lodged in the internal cavity of this tubular element.
According to a preferred form of construction, the micrometric mechanism may comprise a hood provided with a micrometric thread, threaded with a micrometric thread linked with the tubular element and designed to exert a force against the said supple pocket and to communicate variations of the volume to the air contained in the capillary conduit of the distribution tip.
In this case, it may comprise a tube lodged in the internal
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Burke Elizabeth M.
Green Randall L.
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