DE8413879U1 - Tube stand with evacuation device - Google Patents

Description

description

The invention relates to a tube stand with an evacuation device, E.g. for small tubes used for blood tests, the bottom opening of which can be pierced elastic stopper is closed.

There are already known tube racks for such tubes, which for example three on top of each other at a distance have arranged walls. In the walls there are holes in the vertical direction align with each other. The holes in the bottom partition have a smaller diameter than the outside diameter of the tube, while the holes in all overlying partitions have a larger diameter than the tubes have. In this way, tubes can be inserted into the holes of the stand from above and rest with their tube bottom on or partially in the holes in the bottom partition.

It is the object of the invention to develop the known tube stand to the effect that with a pierceable elastic stopper sealed tubes in the tube rack evacuated and thus before the Blood draw can be made operational without the use of a plunger.

A tube stand is used to solve this problem type mentioned at the outset, which is characterized by a vacuum chamber which has a number of after

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upwardly directed hollow needles having "and by a Ueto ^a .r the hollow needles posxtionierbaren insert for holding the tubes, which can be lifted off from the vacuum chamber in a guided manner.
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This ensures that with the tube rack positioned above the vacuum chamber, tubes are seen from above can be inserted into the tube rack and evacuated therein. To do this, the tubes only have to be placed in the Area of their bottom opening have a pierceable elastic stopper, which when introduced into the Use of the tube stand according to the invention is pierced by the hollow needle positioned underneath. When the upper end of the tube is closed / for example by one provided with a shut-off element Closure cap, then a tube inserted in this way can be placed over the vacuum chamber of the tube stand to be evacuated. For the simultaneous evacuation of several tubes, the bottom of the chamber faces the vacuum chamber a plurality of upstanding hollow needles, each for piercing the elastic plug a tube inserted from above. The insertion of the tubes into the tube rack has at the same time to be done by hand, with the operator having no difficulty in piercing the elastic Applies plug required force.

To draw blood, a tube can be removed from the associated hollow needle by inserting the desired Pulls up the tube by hand. As soon as the hollow needle comes free from the elastic stopper, it closes again and keeps the negative pressure created in the tube sufficient e.g. for taking blood Upright for a while. However, if several tubes are to be removed from the hollow needles at the same time, so

the use is preferably carried out by a lever mechanism lifted from the chamber floor of the vacuum chamber so that they come free of the hollow needles. Of the The tube stand serves as a work stand at the same time.

To lift the insert off the vacuum chamber, levers are preferably arranged in the side walls / each of which can be pivoted around pins. The levers preferably have teeth on a semicircular arc are arranged and cooperate with correspondingly divided teeth in the side walls of the insert. The levers are expediently provided with elongated holes so that they are only used to form a longer one Lever arm must be raised and then swiveled down. In another version at least one cam arranged on a pivot axis is used to lift the insert.

In addition, guide projections and are preferably used to guide the insert in relation to the vacuum chamber appropriately shaped guide grooves provided. In another version, the insert is provided with guide bores in which on the chamber floor arranged guide pins can penetrate.

Further advantageous refinements of the invention emerge from the subclaims and the following Description of an embodiment.

The invention is explained in more detail below with reference to figures; show it:

Figure 1 is a perspective view of an embodiment in assembled condition;

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Figure 2 is an exploded perspective view of the embodiment of Figure 1 State; and

FIG. 3 shows a partial section through the exemplary embodiment according to FIG. 1.

Figure 1 shows an essentially two-part tube stand 1 with a vacuum chamber 2 and a Insert 22 for receiving tubes 40 shown only in FIG. 3. Insert 22 is essentially cuboid and has a number of holes 24 in its upper side 23, the diameter of which is somewhat is larger than the outer diameter of a conventional tube. The elongated insert 22 is at his narrow side walls 26 guided by side walls 4 of the vacuum chamber 2, so that the tube rack 1 overall has the shape of an approximately cuboid block. In the side walls 4 of the vacuum chamber 2 are Lever 8 is arranged, which serve to lift the insert 22 out of the vacuum chamber 2 upwards. For this the levers 8 are pivoted outward and downward, in a preferred embodiment according to the Lifting took place parallel to the side walls 26 until an elongated hole 12 provided in the levers 8 was also present one end rests against a pin 10 holding the lever 8 in the side walls 4 of the vacuum chamber 2. the Vacuum chamber 2 is connected to a vacuum pump, not shown, via a check valve and a hose 20 connected.

In the upper part, FIG. 2 shows the insert 22 lifted out of the vacuum chamber 2, parallel guide grooves 28 being visible in one of its side walls 26 . The guide grooves 28 run parallel to one

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vertical side edge of the insert 22 over its entire height. Between the guide grooves 28 is also arranged a lever recess 30, which at least in a partial area teeth 32 in the manner of a Has rack and also extends over the entire height of the insert 22.

In the lower part, FIG. 2 shows details of the vacuum chamber 2, the chamber bottom 3 of which corresponds to the number of holes 24 of the insert 22 and corresponds to these Holes 24 has aligned hollow needles 18 which protrude from the chamber floor 3. The hollow needles 1 & have expediently lateral inlet openings; their length and diameter are such that they are in the A separating tube 40 placed in the insert 22 is inserted in the tube bottom 42 of a separating tube 40 to pierce elastic stopper 44 and thus the interior of the separating tube 40 over the chamber bottom 3 and to evacuate the hose 20 according to FIG. 3 without piercing a cylinder section from the stopper 44.

At the ends of the chamber bottom 3, or more precisely at its opposite sides, side walls 4 protrude upwards, which on their mutually facing surfaces have vertical guide projections 7 which cooperate with the guide grooves 28 of the insert 22 and this when lowering or lifting in relation to the rammer floor 3 lead in a vertical direction. The side walls 4 also each have a recess 6 in which a lever 8 is mounted in each case. Each of the two levers 8 has recessed grips 14 at its upper end Mistake. In addition, each lever 8 has an elongated hole 12 through which a connecting the side wall parts Pin 10 is inserted. This pin 10 forms a pivot point for the associated lever 8 around the insert

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22 to lift off from the chamber floor 3. For this purpose, the lower end of each lever 8 is provided with teeth 16, the pitch and profile of which are those present on the insert 22; Teeth 32 corresponds.
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FIG. 3 shows a partial section through the tube stand 1, from which the interaction of the lever 8 with the insert 22 can be seen. In the illustrated embodiment, teeth 16 are arranged at the lower end of the lever 8, specifically on an arc of a circle, the center of which coincides with the center of the lower end of the elongated hole 12. In the rest state, the lever 8 is lowered by its own weight and hangs with the upper end of its elongated hole 12 on the pin 10. In this state, none of the teeth 16 of the lever 8 is in engagement with the teeth 32 of the insert 22, so that the Insert 22 can be raised or lowered freely and unhindered. This is normally the position in which the insert 22 is positioned above the chamber floor 3. Tubes 40 can then be jasted into insert 22 positioned in this way by inserting a tube 40, the tube bottom 42 of which has a bottom opening 43 closed by an elastic stopper 44, from above through one of the holes 24 of the insert 22. The insert 22 has an intermediate wall 34 which is used to guide and hold the tube 40 and, for this purpose, has holes 25 which are aligned with the holes 24 in the upper side 23. Below the intermediate wall 34 there is a bottom wall 36 with holes 38 of smaller diameter, which serve to hold the tube bottom 42 of an inserted tube 40. In another embodiment, not shown, the insert 22 is a block with bores for receiving the tubes 40. When the insert 22 is lowered onto the chamber floor 3, they extend

the hollow needles 18 of the Kanunerbottens 3 in the holes 38 of the bottom wall 36 and protrude over this in a vertical direction Direction a little upwards. As a result, when one is fully inserted, they penetrate with an elastic Stopper 44 provided tube 40 into the interior of the tube 40 and make a connection to a Vacuum pump. In this way, the inside of a tube 40 can be evacuated without difficulty, wherein however, it is assumed that the upper end of the tube 40 is in a manner known per se, for example is closed by a closure cap provided with a shut-off element.

In the application, a tube 4 0 can either from Hand removed from the associated hollow needle 18, the plug 44 due to its elasticity The puncture point closes automatically and the established vacuum is maintained for at least some time. As already mentioned, the hollow needles 18 are only intended to pierce the stopper 44, but not a small one Cut out the plug. For this purpose, the tip of the hollow needles 18 is expediently closed, while 18 entry slots are provided in the jacket of the hollow needles.

If several tubes 40 are to be removed from the hollow needles 18 at the same time and made available for the work purpose, the lever 8 is expediently first raised until the lower end of the elongated hole 12 rests against the pin 10 and the teeth 16 of the lever 8 pass through Pivoting the lever 8 with the teeth 32 of the insert 22 can be brought into engagement. It follows readily from the drawing, that is lifted during the downward pivoting of the lever 8 of the insert 22 upwardly and thus of the chamber floor. 3 The one for this

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The required force can be dimensioned by the length of the lever 8 so that the levering out of the insert 22 from the vacuum chamber 2 does not constitute an unreasonable stress.
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The device according to the invention can be used in the plastic injection molding process Manufacture without difficulty, the assembly effort is low. As metal parts only the pins 10 and the hollow needles 18 would have to be implemented. Another advantage of the invention The device is that tubes 40 can be used, which are only in their tube bottom 42 need to have a resilient plug 44; a piston with associated piston rod is no longer required, what the production of a mass and consumable article representing tube 40, for example significantly cheaper in the form of a blood collection system.

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Claims (12)

A ^ TÖlMEftG european patent attorneys PATENTANWÄLTE BESELERSTRASSE 4 D-aoOO HAMBURS 52 DR. J.-D- FRHR. by UEXKOLL DR. ULRICH GRAF STOLBERS DIPU-ING. JÖRGEN SUCHANTKE DIPL.-ING. ARNULF HUBER DR. ALLARD von KAMEKE Dr. Uwe W. Bailies (20792 HU / co / wo) Jägersberg 7-9 Kiel April 1984 Tube rack with evacuation device claims 1. Tube stand with evacuation device, characterized by a vacuum chamber (2) which has a Number of upwardly directed hollow needles (18), and by one above the hollow needles (18) positionable insert (22) for holding tubes (40) from the vacuum chamber (2) guided way is liftable. 2. Tube stand according to claim 1, characterized in that the vacuum chamber (2) has a a vacuum pump can be connected and the hollow needles (18) load-bearing chamber floor (3) and side walls arranged on opposite sides of the chamber floor (3) (4) for holding the insert (22). I * 5 3. tube rack according to claim 2, characterized marked% is characterized in that for in the side walls (4) levers (9) \ Lifting of the insert (22) from the chamber floor (3) Ί are arranged. 4. tube rack according to claim 3, characterized in that that the levers (8) are arranged in recesses ι 6) of the side walls (4). 5. tube stand according to claim 3 or 4, characterized in that the lever (8) elongated holes (12) have, through which each one the lever (8) in the recesses (6) of the side walls (4) holding pin (10) extends. 6. tube stand according to one of claims 3 to 5, characterized in that the levers (8) at their have upper ends recessed grips (14) and teeth (16) at their lower ends. 7. tube tander according to one of claims 3 to 6, characterized in that the teeth (16) on the levers (8) are each arranged on an arc of a circle are. 8. tube stand according to claim 7, characterized in that the circular arc is chosen so that its center coincides with the center of the adjacent elongated hole end. ι t
ι ■ · - 3 9. tube stand according to claim 1 or 2, characterized in that the insert (22) in opposite Side walls (12 (5) lever recesses (30) having which are provided with teeth (32), which one of the teeth (16) of the lever (8) corresponding Have division. 10. tube stand according to claim 1, 2 or 9, characterized characterized in that guide grooves (28) are provided in the side walls (26) of the insert (22), which guide projections (7) of the vacuum chamber (2) engage. 11. Tube stand according to a ckir claims 1 to 10, characterized in that the insert (22) has at least one seated on a lever axis Cam can be lifted from the vacuum chamber. 12. tube stand according to claim 2, characterized in that the vacuum chamber (2) has a for Vacuum pump continuous check valve can be evacuated.