Hypodermic anesthetic injection method
First Claim
1. A method for anesthetizing body tissue by means of local anesthetic using a hollow hypodermic needle, the steps ofestablishing a uniform flow of anesthetic at a flow rate less than 1.0 cc. per minute through the needle no later than the instant of entry into the tissuemaintaining said uniform flow while moving the needle into the tissue, whereby said flow rate is sufficient to establish and maintain a sheath of liquid anesthetic around the forward portion of the moving needle thereby to anesthetize the path of travel of the needle.
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Accused Products
Abstract
A method and apparatus for effecting painless hypodermic needle administration of liquid anesthetics particularly in dentistry in which the needle is carried on a light wand and the anesthetic is delivered to the needle by motive means independently of the operator'"'"'s fingers during penetration of the needle, with both the rates of penetration and expression of liquid being controlled to achieve intermediate numbing followed by a high rate of liquid expression, if desired, to achieve full anesthesia of the site.
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Citations
4 Claims
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1. A method for anesthetizing body tissue by means of local anesthetic using a hollow hypodermic needle, the steps of
establishing a uniform flow of anesthetic at a flow rate less than 1.0 cc. per minute through the needle no later than the instant of entry into the tissue maintaining said uniform flow while moving the needle into the tissue, whereby said flow rate is sufficient to establish and maintain a sheath of liquid anesthetic around the forward portion of the moving needle thereby to anesthetize the path of travel of the needle.
Specification