Patent RU-2299078-C2 (RU)
Inventor: SHO TOMAS DZH
IPC: A61M25/06
Filed: 2002-11-27
Granted: 2007-05-20
Abstract: FIELD: medical facilities. 
     SUBSTANCE: conductor can be used for introduction of medicinal preparations in patient's body, in particular, for intravenous introduction of fluid. Conductor for introduction of intravenous catheter has tubular case; unit of needle holder provided with tubular case engaged with case for shift; take-away mechanism mounted in ring-shaped space between case and unit of needle holder; plunger unit with plunger pipe introduced into dismountable engagement with tubular case inside casing; and catheter connected to tubular case by means of friction engagement. Tubular case has ring-shaped groove turned outside, which groove is proximal in relation to plunger pipe. Plunger pipe has ring-shaped boss, oriented inside, which boss is proximal in relation to tubular case. Ring-shaped groove and ting-shaped boss are pressed to form dismountable joint. According to other version of manufacture, plunger pipe has end with opening, which has to be opposite to tubular case. According to third version of manufacture, elongated tubular case has first end which fastens hollow needle with slanted end, second end containing porous plug, supported by friction engagement; expanding chamber disposed between first and second ends, which chamber communicates with hollow needle via channel for fluid, and external wall provided with ring-shaped groove, which groove is disposed close to second end. Plunger pipe has open end which is introduced into engagement for shift along second end of tubular casing of unit of needle holder; end with opening to opposite to open end, and engaging structure protruding in radial inside close to open end. Engaging structure is spring-loaded to make engagement with ring-shaped groove of unit of needle holder by force being sufficient to prevent movement of unit of needle holder against plunger unit by take-away mechanism. According to fourth version of manufacture, part of needle mounting goes though take-away mechanism and it protrudes in front of tubular casing. According to fourth mechanism, conductor for introduction of intravenous catheter has transparent plastic tubular casing, unit of needle holder mounted inside casing, plunger unit, take-away mechanism and catheter. Casing has narrow end, wide end, stepwise diameter between wide and narrow ends, and transversely protruding shelves being adjacent to wide end. Unit of needle holder is mounted inside casing and it has hollow needle with slanted end, member of mounting of needle which keeps needle in axial to casing, transparent plastic expansion chamber which communicated with hollow needle along communication channel, porous plug, which plugs expansion chamber at end being opposite to hollow needle, and ring-shaped groove turned in radial outside close to plugged end of expansion chamber. Plunger unit has transparent plastic plunger pipe with open end inserted into casing to embrace part of mounting of unit of needle holder, cavity for taking away, which cavity is big enough to provide removal of slanted end of needle into  casing after taking-away; first structure protruding radial outside to make engagement with casing, and second structure protruding radial inside to make engagement with ring-shaped groove; edge cap provided with opening, which cap plugs plunger pipe at side being opposite to open end. Take-away mechanism, pressed inside casing around unit of mounting of unit of needle holder, which mechanism spring-loads unit if mounting of needle against cavity for take-away inside plunger pipe. Catheter, which embraces narrow end of catheter, has dish disposed in axial to hollow needle and is capable of moving freely inside it. Second structure engages with ring-shaped groove to prevent shift of unit of mounting of needle holder in cavity for take-away by press force of take-away mechanism and by any additional force, which effects top of end when dish is introduced in patient's body. 
     EFFECT: reliability; quick manufacture; lower chance of taking needle away before time at storage and operation; protection of medical personnel against random punctures of needle; reduced chance of getting infected by pathogenic factors transferred by blood. 
     66 cl, 6 dwg