ANESTHESIA AT A CONTINUING AND DECREASING RATE.

摘要

A method of administering post-operative anesthesia directly to the surgical site through a catheter (38) introduced into the site during the post-operative procedure. The flow of medication into the catheter is regulated by a micro-bore cannula (36) that ensures delivery at very small rates. The plunger (22) of a spring-loaded syringe (20) creates the pressure that causes the medication to flow through the cannula and catheter into the wound. Because of the spring's nonlinear characteristics within the range of stroke of the plunger, the pressure exerted on the liquid gradually decreases with the expansion of the spring (30). By appropriately sizing the spring and the inside diameter of the cannula, a device is developped that administers the required dosages of anesthetic continously and at decreasing rates.