HIGH-VISCOSITY MATERIAL INJECTION DEVICE Russian patent published in 2011 - IPC A61M37/00 A61M31/00 A61M5/148 A61M5/00 

FIELD: medicine.

SUBSTANCE: invention refers to medical equipment, namely to biomechanical material injection, and more specifically to a device for high-viscosity material injection in a portion of a patient's body. The device for high-viscosity material injection in a cannula comprises a container, a pressing unit in liquid junction with the container, an overload valve for pressure balance in the device and a material moving element. The container is inextensible and has an outlet hole used for connection with the cannula for viscous material transportation. The pressing unit limits a fluid flow path through which an incompressible fluid is transferred. The material moving element cuts the fluid flow path and forms a section for incompressible fluid reception from its one side and a section for viscous material reception from the opposite side. The section for incompressible fluid reception is connected with the fluid flow path of the pressing unit for applying pressure. The section for viscous material reception is connected with the outlet hole of the container. The material moving element is movable under pressure of the actuating incompressible fluid to displace the viscous material from the section for viscous material reception of the container into the cannula. The viscous material injection device contains the inextensible body, material moving element, pressing unit and overload valve for pressure balance in the device. The material moving element divides the inextensible body on a first cavity having a first volume designed for incompressible fluid reception, and a second cavity having a second volume designed for viscous material reception. The material moving element is movable to change the first and second volumes in inverse proportion. The pressing unit for transferring the incompressible fluid into the first cavity which moves the material moving element for increasing the first volume and decreasing the second volume, thereby injecting the viscous material from the inextensible body. The container for the device for viscous material injection in patient's tissue comprises a proximal end, a distal end whereon an outlet hole for cannula connection and a flexible and inextensible package integrated in the container and designed for viscous material reception are provided. The package has a hole connected with the distal end of the container and connected with its outlet hole. The container is designed for receiving pressurised incompressible fluid surrounding the package, and thereby compressing the package and displacing the viscous material contained therein through the outlet hole of the container. The device for viscous material injection in patient's tissue comprises the inextensible container, the pressing unit in liquid junction with the inextensible container and the material moving element. The container has a proximal end with an inlet hole, a distal end with an outlet hole designed for connection with the cannula. The pressing unit is designed to generate pressurisation of the incompressible fluid. The pressing unit comprises a body and a power piston. The body has a fluid inlet, a fluid outlet and a fluid flow path created in between, at least one return valve in the flow path controlling fluid flow. The fluid outlet is designed in liquid junction with the container. The power piston is coupled with the body, by liquid junction with the flow path. The power piston is designed to provide a mechanical advantage by pressurising the fluid flow path when the incompressible fluid is transferred between the first and second positions. When movable to the second position, the power piston creates suction force transferring the incompressible fluid through the inlet. The return valve prevents reverse flow through the outlet back to the body. If returned to the first position, the power piston creates pressure transferring the incompressible fluid through the return valve from the body through the output and into the inextensible container. The material moving element divides the flow path between the inextensible container and pressing unit actuating the section of incompressible fluid reception and the section for viscous material reception. The material moving element is movable under pressure of the incompressible fluid inside the section of incompressible fluid reception to the outlet of the inextensible container, thereby displacing the viscous material from the section for viscous material reception into the cannula. In the second version of the device for viscous material injection into the cannula, the material moving element comprises a membrane elastically stretched under pressure of the actuating incompressible fluid.

EFFECT: invention provides mechanical advantage in viscous material injection.

49 cl, 14 dwg