SE0801728A0 - A syringe for closed and sterile mixing of two components - Google Patents

Description

General description.

This invention consists of several parts with different functions assembled into one unit. It is intended for mixing two different substances to produce a moldable mass to be deposited where it solidifies rapidly. As such, it can be used for filling cavities or for attaching components including bones.

Known are such substances as e.g. polymethacrylate powder to be mixed with a liquid monomer form of methacrylate to obtain so-called bencement. To avoid the toxic fumes that occur during mixing, there are now closed systems where the fumes are evacuated through various vacuum systems.

The present system differs from others in that liquid located in a glass ampoule and powder are placed in one and the same syringe separated from each other by a flask. In this there is an opening through which after the crushing liquid of the ampoule flows down into the injection cavity. The opening of the piston is closed with a stopper sitting on a shaft in the form of a tube.

This shaft runs through the opening of the syringe. On the shaft is a disc adapted for the spray container with blades reminiscent of a propeller. There is a plug on the disc that fits the hole in the piston.

The plug can be operated with the shaft from the outside into the piston hole, whereby the piston hole can be closed. By twisting the shaft, the plug is separated from the disc.

The syringe is placed in a vertical position. The shaft and the aeration tube lying in it are rotated relative to each other so that the valve mechanism between them is opened. The propeller disc is leveled with the contents of the spray container. The gas lying therein is forced out through the aeration tube by depressing the piston shaft. The vent pipe is closed.

The syringe itself has a special shape with foldable flaps within its upper part.

A ring surrounding the ends is pushed up over them, whereby they are pressed against the piston shaft so that their upper threaded inner side threads against a (53 of the syringe shaft thread. When the piston shaft is turned counterclockwise, a negative impression occurs in the syringe container and its contents are emptied of air and gases.

These are then evacuated by opening the connection outwards when the inner tube in the shaft is rotated for this function. Aeration can be easily repeated if required.

With the piston in the extended condition, the propeller disc is moved to the bottom of the container. The shaft is turned out of the container. The syringe is ready to be delivered.

List of figures of attached drawings.

Figure 1: The mixing syringe seen from the outside.

Figure 2: The mixing syringe seen in section.

Figure 3: The lid of the plastic pipe. a: in cross-section with internal design for ampoule top. b: horizontal cross-sections with internal bulge.

Figure 4 a: Shows a cross section of the syringe plunger. b: The upper part of the shaft without the paddle ring. c. The flask seen from the ampoule side. d.1, d2. Plate with breaking tip.

Figure 5: Ring with shovels. a: The ring seen from above. b: The ring seen from the side Detailed description of the construction.

The product of the invention is intended to be delivered enclosed in a closed plastic bag for sterilization before use.

The unit is to be understood as a syringe, Fig. 1, Fig. 2 with a space in (21) the syringe container, filled with a suitable substance and a piston (13) with piston shaft (2). This piston rod has the shape of a tube, the inside of which is shaped to enclose a glass ampoule (10). The outside is provided with a thread on which a rotatable cover (1) is placed, Fig. 3. A rubber membrane provided with a valve (22) is located on top of the lid in order to increase the pressure in the ampoule when emptying it (10).

The shaft i.e. the tube around the ampoule (Fig.2) is attached to the piston (13) itself (Fig.4a). and thus constitutes the piston shaft.

In the center of the piston (13) itself there is a hole (26) provided with a thread (Figßl). Inside the upper part of this hole there is a fitted space (27a) for a plate (27) (FigAd) provided with a sharp tip (5.) This elongated plate covers only the central part of the hole and thereby provides openings (7) to the sides for the liquid to drain into the spray container.

Above this nail plate there is a circular recess (8a) for a filter (8) which collects any broken glass.

The glass ampoule (10) supports this filter. When the lid (1) (Fig. 3) on the top of the tube containing the glass ampoule is rotated, the bulge (3) on the inside of the lid is pressed against the top of the glass ampoule, which is thereby broken off. Further rotation presses the ampoule against the tip (5) of the plate lying in the recess of the piston therefor, whereby the bottom of the ampoule is broken and the liquid flows down through the filter (8) catching glass fragments into the syringe container.

In the syringe container there is a disc (12) corresponding to the inner diameter of the syringe container constituting the mixing member itself. The disc has several blades (12) with intermediate openings and thus forms a propeller-like body. The disc (Fig.5) is connected to a shaft (19) consisting of a tube, which runs out through the opening of the syringe (20). This makes it possible to operate the mixing means from the outside. The upper part of this outer tube is connected to the stirrer plate and has an opening towards the inside of the container (25). The tube holds within it another 7 (e) tube (14) rotatable towards the outside. This tube is filled with a substance for the resorption of toxic gases. The top of this tube is closed to the booklets (24).

In a certain rotational position, the openings of the tubes will lie opposite each other so that the syringe space is in open connection outwards when the piston pushes gas out of the syringe. When the inner tube is rotated 180 degrees, the connection is closed. A necessary measure when then the mixing procedure is to be performed.

The threaded plug (11) is anchored to the center of the disc - the propeller disc (12) which is to close the hole (26) of the piston (13). When turning the shaft (19) projecting from the opening of the syringe (20), the plug (11) is driven into the hole so that the bottom hole (26) of the piston is closed. When overturning, the plug comes loose from its place and gets stuck in the piston (13).

In the vertical position of the spray unit, the mixture assumes a level which becomes the starting position for the mixing plate with air and gas closest to the spray piston. With pressure on the piston shaft, the gas is removed through the open connection through the coarser pipe into the inner pipe. The inner tube (14) is rotated separately relative to the outer wall through the handle (30) on the inner tube. The contents of the syringe container are turned off.

The ring (15) (Fig. 1) around the flanges (16) is displaced upwards, the threads (18) gripping the thread on the spray shaft (17). When counterclockwise (the position between the outer and inner tube must be closed) rotation of the spray shaft creates a vacuum in the spray container, air and gas blowers are sucked out of the mixture (21). Re-rotation of the inner tube (14) opens the connection to the coarser tube. This gas mixture is evacuated by clockwise rotation of the piston. Re-displacement of ring (15) releases the threaded connection between the flanges (16) and the spray shaft (17) allows a rapid emptying of the gas by pressure on the spray piston.

This evocation of vacuum in the syringe chamber can be easily repeated if necessary.

The mixing of the components in the syringe space takes place by rotating the outer tube (19) at the same time as the mixing disc with the outer tube is inserted into and out of the syringe.

When the mixing process and the vacuum process are finished, the disc is moved with the vanes (12) towards the bottom of the container. The shaft (19) is turned counterclockwise, thereby detaching from the mixing plate. This shaft is then completely removed from the syringe.

The syringe is then prepared to deliver the mixture. s * (e)

Claims (5)

Claims: A syringe (Figs. And 2), which with its piston shaft 2, consisting of a plastic tube enclosing a glass ampoule 10, and whose piston is provided with a hole 26, which can be closed with a stopper 11, via a tubular shaft 19, passes the opening of the syringe, past a substance 21 deposited in the syringe. A device according to claim 1, characterized in that the piston shaft of the syringe is covered by a threaded lid 1, which when rotated first breaks the ampoule tip 10a, and then presses the ampoule so that its bottom is broken against a sharp tip 5, the contents of the ampoule being emptied through the hole 26. A device according to claim 1, characterized in that the plug 11, on the underlying padded disc 12, Fig. 5, in turn attached to the tubular member 19, upon rotation thereof can be inserted into the piston and close its opening by threading until the plug 11 is separated from its bracket in the disc 12, fig.5. A device according to claim 1, characterized in that the tubular shaft 19 fastened through the disc 12, is provided within itself with an inner tube 14, which in its upper part is formed 24, so that in case of some rotation towards the outer tube it gives a complete closure of the connection between the pipes through the disc A device according to claim 1, wherein flaps 16 extend at an angle from an elongated spray container facing the spray shaft provided with thread 17, flaps, which in their upper part are equipped with thread grooves 18, which can be pressed against the piston shaft 2 with a movable around the flanges ring 15 with the possibility of rotatably displacing the piston in the syringe container via the threaded connection in order to achieve a vacuum effect within it.