Hypodermic anesthetic injection apparatus and method
First Claim
1. Apparatus for the injection of anesthetics including a hollow hypodermic needle, a handle assembly for carrying the needle, and a single source of liquid anesthetic, the apparatus comprising:
- pump means having a positive duty cycle to expel liquid anesthetic from the needle tip,programmed discharge flow rate control means associated with the positive duty cycle to selectively expel liquid anesthetic at a first rate not to exceed 0.25 to 1.0 cc. per minute and at a second rate of greater than approximately 2.0 cc. per minute,and control means to select between the first and second flow rates, whereby the first flow rate can be established during implantation of the needle in the tissue to establish a small positive low flow rate during penetration, and the second flow rate can be established after implantation.
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Accused Products
Abstract
An aspirating hypodermic syringe and method for injecting dental anesthetic in which anesthetic flow through the needle is established independently of the fingers of the operator and in which different rates of flow are provided, including positive flow while the needle is entering the tissue. Effective aspiration in syringes which use expendable anesthetic vials is assured by means of a yieldable resistance member in the syringe which holds the vial with sufficient force to enable the syringe plunger to lock positively onto the piston of the vial.
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Citations
7 Claims
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1. Apparatus for the injection of anesthetics including a hollow hypodermic needle, a handle assembly for carrying the needle, and a single source of liquid anesthetic, the apparatus comprising:
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pump means having a positive duty cycle to expel liquid anesthetic from the needle tip, programmed discharge flow rate control means associated with the positive duty cycle to selectively expel liquid anesthetic at a first rate not to exceed 0.25 to 1.0 cc. per minute and at a second rate of greater than approximately 2.0 cc. per minute, and control means to select between the first and second flow rates, whereby the first flow rate can be established during implantation of the needle in the tissue to establish a small positive low flow rate during penetration, and the second flow rate can be established after implantation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification