The present invention relates to a pain-alleviating injection needle and, in particular, an injection needle suitable for use by dentists.
In an attempt to overcome the aversion many people have to receiving injections with needles, some pain alleviating injection needles have been developed. U.S. Pat. No. 5,236,419 (Seney 1993) provides an example of such an injection needle. The Seney injection needle has an annular body with an axial central passage. The body is placed like a sheath over a needle, so that the needle is positioned within the central passage. The needle is movable between a retracted position retracted within the central passage and an extended position extending past the annular body. The annular body has hollow defining walls, that contain a substance, which can be frozen. In use, a patient's skin is numbed with the frozen annular body and then the injection needle is moved from the retracted position to the extended position, causing the injection needle to pierce the patient's skin.
Due to space limitations, the teachings of the Seney reference do not work particularly well in the field of dentistry.
What is required is a pain-alleviating injection needle, which is better suited for use by dentists.
According to the present invention there is provided a pain-alleviating injection needle which includes a hollow body adapted to contain a liquid medication. A needle is provided having an attachment end and a piercing end. The attachment end is in fluid communication with the hollow body. A frangible membrane overlies the piercing end of the needle. The membrane is filled with a topical anesthetic. Upon the membrane being pressed against a selected injection site, the membrane ruptures releasing topical anesthetic onto the injection site, thereby numbing the injection site. Upon further pressure being exerted, the piercing end of the needle pierces the injection site.
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
a is a side elevation view showing the end of the injection needle approaching the injection site;
b is a side elevation view showing the end of the injection needle with the frangible membrane ruptured; and
c is a side elevation view showing the needle being injected.
The preferred embodiment, a pain-alleviating injection needle generally identified by reference numeral 10, will now be described with reference to
Structure and Relationship of Parts:
Referring to
Operation:
Referring to
In this patent document, the word “comprising” is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article “a” does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the claims.
Number | Date | Country | Kind |
---|---|---|---|
2,448,541 | Nov 2003 | CA | national |