DE2117124A1 - Device for blood tests - Google Patents

Description

The invention relates to a device for carrying out blood tests by measuring the sedimentation rate of erythrocytes.

The general procedure for such tests consists of drawing blood from a patient's vein a syringe. The blood in the syringe is then transferred to a bottle containing an appropriate anticoagulant contains, and mixed. This mixture is then usually sent to a medical laboratory to look for Remix the contents into a wintrobe sediment -. tion velocity pipe is given. When left standing

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of the pipe in a rack can reduce the sedimentation speed can be determined by recording the time taken for the red blood cells to settle and the altitude reached. The above procedure is time consuming, requires various devices that must be cleaned, dried, and sterilized, and usually finds in several stages and in different places.

The aim of the present invention is therefore to improve the device used in such tests.

The device for measuring the sedimentation rate of erythrocytes according to the invention characterized by a syringe with one of the guidelines for Wintrobe-Rofcre for determining sedimentation velocities corresponding cylinder.

There are further advantageous features of the invention 4in that there is an anticoagulant in the hole of the syringe barrel and that a stirring ball is pressed against the outlet through the bore when the piston is in its innermost position. * \

Still other preferred features of the invention are characterized in that with the syringe plunger «: s arranged

^ w _; i · - 2 - BADORfGINAL

Means for removing air from inside the Syringe -are provided during use and that a Needle cover is provided for the needle, which is designed as a container and provided with a shoulder on which a closure for the opening of the needle cover is mounted, with which you can use the needle cover as a container whose opening can close.

An embodiment of the invention is based on the Drawings described in more detail. Show it:

Fig. 1 is a side view of the entire device;

Fig. 2 is a longitudinal section on a larger scale through the end of the syringe on which the needle is located j

Fig. 3 and 4 are longitudinal sections of another and preferred " th piston arrangement in two different working phases and

Figure 5 is a side view of the needle cover for the syringe.

In the illustrated embodiment of the invention, the device consists of a syringe with a Sprlt-

- 3 - ORIGINAL BATHROOM

109843/1321

cylinder 1, which is calibrated and of a size following the guidelines for a Wintrobe sedimentation velocity tube is equivalent to. One end 2 of the cylinder is closed with a shaped bottom 3 through which a Center hole 4 passes through it. The other end 5 is open and the piston shaft 7 extends through it Pistons 6. Finger holders 8 and 9 are attached to the piston and cylinder in the usual way.

A hollow needle 10 protrudes through the bore 4 of the base 3 and is fastened to the base 3 by a Holder .11 held in place *

The inner side of the base has a conical recess 12 which has a valve seat for a stirring ball 13 forms, and the piston is arranged so that it in its innermost position the ball in a sealing Position on the valve seat.

A suitable anticoagulant 14 is located in the device in the space between the ball 13 and the inner end of the piston 6.

When using the device according to the invention Blood drawn from a patient by using the syringe as an

. . ^m * '~ BAD ORIGINAL

1098A3 / 1321

Borrowed withdrawal syringe is used. When the piston is withdrawn, the ball 13 lifts you from the bore and the blood can through the needle into the cylinder penetration. The blood is in the cylinder with the anticoagulant mixed to prevent the blood from clotting.

The piston is above the zero line 15 of the cylinder scale withdrawn out to a position which is expediently marked on the cylinder, for example with an X, and the needle is then withdrawn from the patient.

The syringe is then inverted slowly and repeatedly to mix the anticoagulant with the blood. The mixing is achieved by the movement of the ball 13 in the Inside the cylinder supports.

The syringe is then held vertically with the needle pointing up \ and the excess blood and any air bubbles are expelled by advancing the plunger to the zero mark on the calibrated scale.

The syringe is turned upside down and left in a rack. «In this position the ball and seat act as

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Valve. The sedimentation rate can be in the usual This can be determined by measuring the time it takes for the erythrocytes to settle down and the height they have reached will.

It can happen that an air bubble originating from the air initially in the hollow needle gets stuck on the piston and cannot be expelled in the manner described above. If it is desired to remove such an air bubble, the piston and the piston shaft can be provided with a through bore 17 in which a rod 18 is located, as shown in FIGS. The shaft 19 and the rod 20 are provided at their outer end with a pin with a screw thread 21 and a matching screw 22, so that the rod w by a rotational movement of the lid relative to the shaft partly withdrawn advertising the can. The two extreme positions of the rod are shown in FIGS.

When using such a plunger stem, the blood is drawn in first, and then the air bubble adhering to the plunger is drawn into the bore through the stem by rotating the cover 22 in a suitable manner relative to the stem . To determine the sedi-

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mentation speed is then continued in the manner described above.

The rod can also optionally be omitted, however in this case the cap must be airtight on the pin. Rotation of the cap will in turn cause the air bubble is drawn into the bore, which in this case have a noticeably smaller diameter can as in the case of using the wand. ~

The syringe is preferably made of synthetic resin, like conventional syringes, with the exception of the needle and the ball, which are made of steel or other suitable material; the piston is preferably made of rubber or the like polymeric material.

The device according to the invention expediently has a needle cover 23 so that the needle is sterile remain. This needle cover is preferably designed in the form of a "cylindrical container which has an attachment 24 at its closed end which can carry a cap 25 with which the opening of the container can be closed when it has been removed from the needle. The needle cover and container can then be used together as a sample bottle to take the blood sample for eventual use to keep any further examinations necessary.

10 9843 / ι $ 3 1 BADORK3INAL

The advantages achieved with the device according to the invention consist, inter alia, of the low cost for the device, saving test time and chemicals required for cleaning and sterilization, and a greater measurement accuracy is achieved because there is practically no time delay and the test can be done on the spot. The latter is particularly beneficial for patients in rural areas.

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Claims (10)

Claims ■ \ .J device for measuring the sedimentation rate of red blood cells, characterized by a syringe having a to the guidelines for Wintrobe tubes for the determination of sedimentation velocities corresponding cylinder (1) and a perforating, ten, for receiving a hollow needle (10) formed bottom ( 3) at one end of the cylinder. 2. Device according to claim 1, characterized in that that an anticoagulant (14) is contained inside the device. 3. Apparatus according to claim 1 or 2, characterized in that there is a stirring ball (13) located inside the syringe. t 4. Apparatus according to claim 3, characterized in that the ball (12) to abut at the inner end, shaped as a valve seat, of the bore (4) going through the base and the piston (6) ao is arranged that in its innermost position it holds the ball in a sealing position on the valve seat. 109843/1321 5. Apparatus according to claim 1 to 4, characterized characterized in that the piston and the associated Shaft (19) with a through hole (17) and at the outer end of the bore with a device for Drawing in a quantity of liquid from the syringe into the bore is equipped. 6. Apparatus according to claim 5, characterized in that the device for pulling in the amount of liquid from a rod (20) reaching through the bore and a device with a screw thread for withdrawing the rod to a limited extent from the bore. 7. The device according to claim 5, characterized in that the device for drawing in the _{amount of liquid continues to consist of a screw-threaded 9} with a suitable tap P fen (21) cooperating at the outer end of the shaft and with this screw cap (22) which is in sealing engagement. 8. Apparatus according to claim 1 to 7, characterized in that one designed as a container Sheath (23) is provided for the needle. - 10 10 9 8 4 3/1321 9 «Device according to claim θ, characterized in that that on the HUlIe designed to receive a closure piece (25) for the container Device (24) is attached. 10. Apparatus according to claim 1 to 9, characterized in that the device, insofar as feasible, made of plastic. - 11 - 109843/1321 Jl Blank page