FR2567416A2 - Blood stirrer - Google Patents

Abstract

Improvement to a blood stirrer according to Fance patent 81 04918. According to this invention the stirrer in accordance with the main patent is characterised by a stirring system in which the tray is driven in a sinusoidal motion by virtue of a rotation mechanism represented by a tray carrying rollers of different length. According to the invention the stirrer in accordance with the main patent is characterised by a weighing device using springs 13 and square frame 14. These springs are connected by a movable square frame 15 which supports the lid 28 supporting the stirrer. The weighing device is associated with a sampling cutting device operating by virtue of an end stop 29 actuating the microswitch 21 which actuates the electromagnet 32 which triggers the lever 22 which releases the plunger 23 which actuates, via a spring 33, the stud 30 which thus pinches the tubing ensuring the clamping. The cursor 20 supporting the microswitch 21 provides the target value by modifying the separation distance between the latter and the end stop 29. The invention can be employed for the automatic sampling of blood in pouches, and for the continuous stirring of liquids in the course of sampling.

Description

The present invention relates to improvements made
to French Patent NO 81 049I8 for blood shaker in the name of the applicant.

The main patent relates more specifically to a blood shaker in a bag, characterized mainly by a mechanism driving a pocket-carrying tray in a sinuso # dal movement.

According to a provision of this patent resulting in particular from claims 7 and 8. The pocket-carrying plate cooperates with three roller-carrying arms of different length imparting to the plate its sinusoidal movement as it rotates, this plate being retained by a flexible axis tilting in all directions to follow the kinematics of the platform.

Although this set is entirely satisfactory from a functional point of view, it has been found useful to control the weight of blood withdrawn with agitation so as not to exceed a certain withdrawal rate of the order of 350 g for individuals under 60 k0 and 450 grs for individuals over 60Kb
The invention therefore has as its object an apparatus of the type described in the main patent, but having an incorporated weighing device, which, associated with a cut-off device automatically stops the sampling when the target weight is reached.

To this end, the device conforms to the Main Patent and equipped with a weighing device characterized by the fact that it comprises system of leaf springs I3, mounted in parallelogram on the brackets I4 and 15 whose bracket 14 is fixed on the box 27, the square I5 ensuring the connection with the cover 28 integral with the box I2, contains the mobile element of the weighing, acting on the micro SWITCH 21 mounted on the adjustment slider 20.

The spring 17 being connected to the bracket I6 fixed on the housing 27 ensures the taring of the weighing with the bracket 15, mobile element of the weighing mechanism.

According to a provision of the invention, the agitator is title cut off from any electrical supply thanks to the cam I8 raising the bracket 15, blocking the agitator in the off position and tripping the contact I9 of the energy source.

In the on position, the parallelogram is released thanks to the lever 18 switching the contact I9 for starting the agitator.

When the set weight is reached, the parallelogram has collapsed carrying with it the cover 28 and the housing I2, therefore the stop 29 acting on the micro SWITCH 21 actuates the electromagnet 32 which releases the lever 22 releases the piston 23, which automatically clamps the tubing.

 This stops the sampling, without stopping the agitator because it is controlled by raising the cam 18 which triggers the contact I9.

Another novelty of the system consists in the fact that the piston 23 has at one end a cam 3I which triggers the contact 25, thus lighting the indicator 26 for signaling the end of sampling,
The resetting of the piston 23 extinguishes the indicator 26, releases the sampling tube, the agitator is ready for a new sampling.

Other characteristics and advantages still appear on reading the detailed description which follows, of an embodiment given here by way of example and represented in the single attached figure showing, in perspective, the constituent elements of the 'apparatus.

Claims (1)

 - R E V E N D I C A T I O N S -  1O blood shaker, in particular according to claims 1, 7 and 8 of the main patent, characterized in that the pocket-carrying tray and the housing containing the drive mechanism is associated with a weighing device adjusted to a value of deposit, this device cooperating with a mechanism ensuring the automatic cut off of the blood sample when the target value is reached.  2 - Blood shaker according to claim 1 characterized in that the weighing device consists of two leaf springs 13 and a fixed bracket 14, as well as a movable bracket 15 which supports the shaker.  3O blood shaker according to claims 1 and 2 in that the mechanism ensuring the automatic clamping of the sample consists of a stop 29 which, acting on the micro-SWITCE 21 actuates the electromagnet 32 which triggers the lever 22 which releases the piston 23, the lug 30 pinches the tubing, this occurs when the collapse of the weighing system has reached its set value.  4. Blood agitator according to claims 1, 2 and 3 comprising an indicator for checking the end of the sample 26, is fed free of charge to a cam 31 Solid with the piston 23, responsible for stopping the sample, acting on the microphone -SWITCH 25.  5- ~ Stolon blood shaker claims 1,2,3 and 4 is equipped with a weighing neutralization button 18 and stop switch 1C on running rust mechanism in position High - OFF.