RU2033195C1 - Syringe - Google Patents

Abstract

FIELD: medical equipment. SUBSTANCE: unit joining rod with piston has ring installed in one of joined part for rotation round syringe axis. Joint unit is made in form of bosses on the other part from both sides of ring. Ring ends have radial grooves in form of teeth for alternating receiving of bosses in rod reciprocation. Extreme grooves are connected with through longitudinal recesses to pass bosses. EFFECT: provision of single use of syringe for viscous and multicomponent substances by performing the preset number of reciprocations of rod and piston before their separation. 2 cl, 11 dwg

Description

 The invention relates to medical equipment, namely to syringes intended for single use.

 A known syringe containing a housing and a piston with a rod.

 The disadvantage of such a syringe is the possibility of reusable without any restrictions.

 Known syringe containing a housing, inside of which are located the rod and piston, and a device for connecting the rod to the piston.

 The known syringe cannot be used on viscous and multicomponent substances, for filling which require multiple reciprocating movements of the piston.

 The closest in technical essence and the achieved result to the invention is a syringe containing a housing with a needle holder, inside of which there are a piston and a rod, interconnected via a connection node.

 This disposable syringe also cannot be used on viscous and multicomponent substances, since already after the first movement of the rod towards the piston, they are disconnected and the syringe becomes unsuitable for further use.

 The aim of the invention is to provide the possibility of a single use of the syringe for viscous and multicomponent substances by the ability to perform a given number of reciprocating movements of the rod and piston before they are disconnected.

 This goal is achieved by the fact that in a syringe containing a housing with a needle holder, in which a piston and a rod are located, connected by means of a connection unit including a retaining ring and made in the form of a cavity in the first of the connected parts, in which the second part is placed with the possibility of longitudinal movement in which the ring is installed, protrusions are made on the second part of the connection unit, between which is placed a ring with longitudinal longitudinal sections made on its inner surface and at the ends, respectively s teeth and shaped radial grooves which are interconnected and which have the ability to alternate the placement protrusions second member, whereby the ring is rotatable.

 In addition, the edges of the contacting surfaces of the ring and the second part are rounded.

 Figure 1 shows a syringe, a section; figure 2 section aa in figure 1; figure 3, the stem and ring of the syringe for two actuations in a perspective view; in FIG. 4 diagram of the position of the parts of the node connecting the rod to the piston in the initial state; in FIG. 5 the same, for the first movement of the stem from the needle holder of the syringe; Fig.6 is the same, when you first move the rod to the needle holder of the syringe; in FIG. 7 the same, during the second movement of the rod from the needle holder of the syringe; in FIG. 8 the same, with the second movement of the rod to the needle holder of the syringe; Fig.9 is the same, when trying to use a syringe in excess of a given number of reciprocating movements of the rod; figure 10 is a second version of the syringe, a section; figure 11 section BB in figure 10.

 The syringe consists of a housing 1 with a needle holder 2, a piston 3, a rod 4 and a ring 5.

 In the first embodiment of the syringe (Fig. 1-9), the piston 3 is made with a cavity provided with an annular recess in which the retaining ring 5 is rotatably rotated around the longitudinal axis of the syringe. At the ends of the ring there are radial grooves 6 (the number of grooves in Fig. 3 corresponds to a syringe designed for two reciprocating movements of the stem) made in the form of teeth, the extreme grooves being connected to through longitudinal grooves 7 located on the inner surface of the ring. On the stiffening ribs of the rod there are protrusions 8 and 9 for alternately entering the grooves 6 and passing through the grooves 7. The edges of the interacting surfaces of the ring and protrusions are made rounded.

 In another embodiment of the syringe (FIGS. 10 and 11), the ring 5 is placed in the annular groove of the cavity of the glass 10 mounted on the rod 4, and the protrusions 8 and 9 on the stiffening ribs of the tide 11 made on the piston 3.

 The syringe works as follows.

 In the initial state (Fig. 1), the piston 3 is in the extreme (lower) position from the needle holder 2 of the syringe body 1 and the protrusion 8 is placed in the groove "a" (Fig. 4), thereby preventing spontaneous rotation of the ring 5 around the longitudinal axis of the syringe.

 When the rod is first moved away from the needle holder 2 of the housing, the protrusion 8 of the rod 4 exits the groove "a" and at the same time the protrusion 9, entering the groove "b", acts on its lateral inclined surface and rotates the ring 5 to the position shown in Fig. 5 . Further, the movement of the rod 4 by means of stops 9 through the ring 5 is transmitted to the piston 3.

 During the first movement of the rod towards the needle holder 2 of the housing, the protrusion 9 of the rod 4 leaves the groove "b" and at the same time the protrusion 8 enters the groove "c" and, acting on its lateral inclined surface, rotates the ring 5 to the position shown in FIG. 6, after which the movement of the rod 4 is transmitted to the piston 3.

 With the second movement of the rod away from the needle holder 2 of the housing, the protrusion 8 exits the groove "c", and the protrusion 9 enters the groove "g" (Fig.7), then the process is repeated similarly to the first movement.

 During the second movement of the rod towards the needle holder 2 of the housing, the protrusion 9 of the rod 4 leaves the groove "g", and the protrusion 8 enters the groove "d" (Fig. 8), then the process is repeated similarly to the first movement.

 When you try to use the syringe for more than a given number of reciprocating movements of the rod, the protrusion 8 of the rod 4 leaves the groove "e" and at the same time the protrusion 9, going into the groove "e" and acting on its side inclined surface, rotates the ring 5 to the position shown on Fig.9, after which the protrusions 9 of the rod exit through the through longitudinal grooves 7, thereby disconnecting the piston and the rod.

 The syringe shown in FIG. 10 and 11, works in a similar way with the only difference being that in it with a free stroke of the rod, i.e. when the piston remains stationary, the ring 5, installed in the glass 10 of the rod 4, moves relative to the protrusions 8 and 9 mounted on the tide 11 of the piston 3 and, interacting with them, rotates relative to the longitudinal axis of the syringe.

Claims (2)

 1. A SYRINGE containing a housing with a needle holder, in which a piston and a rod are located, connected by means of a connection unit including a retaining ring and made in the form of a cavity in the first of the joined parts, in which the second part is placed with the possibility of longitudinal movement and a ring is installed, characterized in that, in order to ensure the possibility of a one-time use of the syringe for viscous and multicomponent substances by performing a given number of reciprocating movements of the rod and piston until they are disconnected , protrusions are made on the second part of the connection unit, between which there is a ring with radial grooves made on its inner surface and at the ends respectively of through longitudinal grooves and in the form of teeth, which are interconnected and in which the protrusions of the second part can be alternately placed, by means of which the ring is rotatable.  2. The syringe according to claim 1, characterized in that the edges of the contacting surfaces of the ring and the second part are rounded.

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