Patent RU-2714945-C2 (RU)
Title: Fluid medium supply device and method
Inventor: REJZENBURG MOLSON Ketrin
IPC: A61M5/315
Filed: 2013-11-11
Granted: 2020-02-21
Abstract: FIELD: medicine. 
     SUBSTANCE: group of inventions refers to medical equipment, namely to devices for supply of fluid medium and more specifically to medical syringe for percutaneous fluid medium supply. Fluid supply injector comprises a syringe. Syringe has: a cylinder with a peripheral wall, having a longitudinal axis and a distal end wall; plunger movable inside the cylinder parallel to the longitudinal axis in the direction towards and away from the end wall; at least one hollow needle attached at its proximal end to the plunger and extending parallel to the axis towards the end wall, wherein the needle is contained within the cylinder; fluid medium reservoir formed at least inside the cylinder; and power accumulation device for supporting plunger in initial position diverted from one end wall, wherein at least one hollow needle is contained inside the cylinder, and to return the needle to the initial position, as soon as the pressure on the plunger is stopped. Needle extends beyond the end wall of the cylinder only when the pressure is applied to the plunger in the direction of the distal end wall. Fluid medium container is fluidly communicated with inlet needle port when pressure limiting volume is applied to fluid medium. Injector for supplying fluid medium for injection of a solution mixed of at least two components, at least one of which represents a liquid, contains a syringe. Syringe includes: cylinder with closed end wall; a plunger made in the form of an elastomer coupling with a distal end wall; a first needle attached at a proximal end to the plunger such that it is configured to slide along the axis within the cylinder; an additional coupling having a pierceable distal end wall configured to axially slide within the elastomer coupling and forming a first cavity between the elastomer coupling and the additional coupling; a pressure member connected to the additional coupling to form a sealed second cavity therewith; at least additional needle attached to elastomer distal end wall and extending into first cavity; a first fluid medium reservoir formed in the cylinder between the end wall of the cylinder and the elastomeric distal end wall; and a mixing chamber formed in the second cavity configured to contain a separate component. At that, when the pressure is applied to the pressure element and thus to the plunger, the additional clutch moves along the axis inside the elastomer coupling, providing a puncture with the first needle, as well as the extra needle of the end wall of the additional clutch, and, as the plunger continues its axial movement, the fluid medium from the first reservoir enters the mixing chamber to form a solution with the second component, and the solution flows into the first needle, while the first needle protrudes through the end wall of the cylinder. First needle has a section extending into the first cavity. Besides, at least additional needle is connected with the first reservoir. According to another embodiment of the injector for supply of fluid medium, the reservoir includes at least a part of energy content for the effect of volume-limiting pressure on the fluid. Retractable needle assembly comprises a syringe. Syringe comprises: a rigid cylinder having an end wall with a hole for missing the needle; module of plunger and needle, made with possibility of axial movement inside cylinder and needle movement through hole in end wall; device for removal of needle from position, in which needle extends beyond end wall, in position, in which needle is retracted inside cylinder, leaving end wall; and a needle blocking device connected to the end wall and including at least one sliding element configured to cross the hole in the end wall when the needle is retracted and pulled out of the opening. Locking device includes rigid cover installed with possibility of movement at distal end of cylinder and including working surface of cam defined on one of inner surface of cover and outer surface of cylinder, and cam follower to other of said surfaces; energy accumulation device inside cover and cylinder end wall; and a hole defined in the cover aligned along the axis with the needle when the injector is in the initial position. Energy storage device is compressed when pressure is applied to extend the needle through the hole in the cover, and when pressure is stopped, energy storage device expands to allow interaction of working cam follower and cam working surface for removal from alignment of hole in cover with needle when the needle is retracted. 
     EFFECT: inventions are simple, inexpensive and safe. 
     38 cl, 29 dwg