FR2599259A1 - Device for local anaesthesia by application of a refrigerant or anaesthetizing liquid, in particular for dentistry - Google Patents

Abstract

According to the invention, there is disposed on the exit tube 2 of an aerosol canister comprising a refrigerant or anaesthetizing liquid, an adapator 3 carrying cotton-wool 5 allowing, on the one hand, the liquid to be guided and, by compression, the blood flow to be limited. Applications: faster and better directed local anaesthetics in particular in dental surgery.

Description

The present invention relates to a method intended in particular, but not exclusively, for the production of mucosal anesthesia as well as a device allowing the implementation of the method.

Mucosal anesthesia is anesthesia that is performed in a mucous membrane or soft tissue. It is known that such anesthesia should normally precede any other anesthesia, and in particular, transcortical anesthesia. Mucosal anesthesia is carried out by different means - by infiltration of an anesthetic solution, but this
infiltration requires the use of a needle and can
create pain when penetrating the mucosa.

When using a needle with lateral perforation,
mucosal anesthesia becomes impossible - by brushing with a pad impregnated with a
concentrated anesthetic solution. Such whitewashing
requires prior drying of the mucosa and
applying the product for one to two minutes to
obtain an effective action - the vaporization of a product included in a bomb, this
product can be either an anesthetic or a product
refrigerant. The action of an anesthetic spray is slow, and
vaporization leads to diffusion in a large
part of the oral cavity when applying this
anesthetic. The cooling spray is quickly active,
but provided that its application is punctual, this
which is not the case with a sprayer as they are
currently known.

The action of the coolant which vaporizes during its
entry into the air is thus limited, due to its
uncontrolled broadcast. This results in a time of action
prolonged and the need to use an amount of
more refrigerant than necessary.

The present invention aims to increase the effectiveness of anesthesia by refrigeration or other solution, in particular in the dental field, by allowing on the one hand to spray the liquid in a well-defined area of the mucosa, and on the other hand, to interrupt the blood circulation so as to temporarily stop the heating of the mucous membrane, by simple non-traumatic compression.

According to the present invention, the mucous anesthesia device by cold or by external application of an anesthetic solution, consisting in applying a coolant or anesthetic liquid to the part to be anesthetized, is characterized in that the application of the sprayed liquid is performed through a guide member allowing simultaneous compression of the area to be anesthetized.

It is thus possible to perform anesthesia in approximately 30 seconds of application.

The present invention also relates to a device including an aerosol can of coolant or other liquid, characterized in that it comprises an end fitting fixing to the cannula of the bomb, the end fitting having a housing for a compacted cotton pad.

Thus, the nozzle will guide the aerosol which can pass through the cotton, and the cotton, part of which protrudes out of the nozzle, makes it possible to compress the zone which it is desired to anesthetize.

Other characteristics and advantages of the present invention # will appear during the following description of a particular embodiment, given solely by way of nonlimiting example, with reference to the single figure which represents a setting device. implementing the method according to the invention.

In the figure, we see that the aerosol can 1 is extended at its upper part by a cannula 2 or outlet nozzle.

On this cannula fits a nozzle 3, the connection and the sealing thereof being ensured by simple friction,
At the outer part of the nozzle 3 is provided a housing 4 of larger diameter than the diameter of the nozzle itself. The end piece 3 can for example be constituted by a plastic tube having sufficient strength. The housing 4 can be constituted either by a flaring of the tube 3, or even by an insert. Inside the housing 4 is introduced a cotton pad whose rearward movement is limited by the geometry of the end piece 3. The pad 5 is advantageously made of compacted cotton and its diameter is approximately 2 mm. It projects approximately one millimeter from the front face of the housing 4. The cotton pad can be removable or secured to the nozzle. In the latter case, the nozzle is disposable and is changed at each operation.

The operating process is as follows, in the case of dental anesthesia, the front part of the tip 3 is introduced into the mouth, so that the front part of the tampon 5 bears on the region to be anesthetized. A light pressure is then applied to this nozzle so as to interrupt the circulation in the region considered, then one proceeds to the vaporization of a limited quantity of coolant or other liquid, the contact of which with the area causes anesthesia.

 Indeed, the liquid passing through the cannula soaks the cotton and its evaporation occurs only at this level, which allows to have urae action concentrated on a small area. We thus obtain a much faster action than previously which is not thwarted by the blood circulation, and which is deeper for a less quantity of product.

It goes without saying that many variants can be introduced, in particular by substitution of technically equivalent means without thereby departing from the scope of the invention.

Claims (3)

1. Local anesthesia device by application of a  coolant or anesthetic, especially for art  dental, the liquid being included in an aerosol can,  characterized in that a tip (3) is fixed on the  cannula (2) of the bomb, the nozzle (3) being terminated by a  housing (4) receiving a cotton pad (5). 2. Device according to claim 1, characterized in that  the pad (5) is removable. 3. Device according to claim 2, characterized in that  the cotton pad consists of compacted cotton  whose diameter is approximately 2 mm.