Patent ID: 8992541
Filing Date: 2015-03-31
Classification: A61B,A61F,A61M

Abstract:
1. A method of injecting a viscous material into a patient, the method comprising: providing a delivery device having: an injector body having a reservoir and an exit port in communication with the reservoir, the reservoir containing a viscous bone cement prior to the bone cement having set; a hydraulic tube connected to the body; a hydraulic actuator connected to the hydraulic tube and having a vessel, the vessel containing an incompressible fluid, the hydraulic actuator configured to pressurize the incompressible fluid to apply a force through the hydraulic tube to the injector body to force the viscous bone cement through the exit port; wherein the injector body, hydraulic tube, and hydraulic actuator are configured as a hydraulic press such that a force applied to the hydraulic actuator results in an increased force applied to the viscous bone cement; and applying a force to the hydraulic actuator to drive a flow of viscous bone cement from the reservoir and into the patient at a force that is increased with respect to the force applied to the hydraulic actuator, wherein applying the force to the hydraulic actuator comprises moving a first drive element extending into the vessel of the hydraulic actuator from a first, retracted position to a second, advanced position to drive the flow of viscous bone cement into the patient, wherein the delivery device further comprises a second drive element disposed in the injector body and having a first end that includes a first sealing member for preventing hydraulic fluid from flowing into the reservoir, wherein a portion of the injector body having the first end of the second drive element disposed therein has a diameter that is greater than a diameter of the reservoir, wherein when the force is applied to the hydraulic actuator, a distance traveled by the first drive element is greater than a distance traveled by the second drive element.