IL31210A

IL31210A - Blood sampling tube

Info

Publication number: IL31210A
Application number: IL31210A
Authority: IL
Original assignee: Ims Ltd
Priority date: 1967-12-05
Filing date: 1968-12-03
Publication date: 1973-01-30
Also published as: AT306914B; BE725010A; SE363231B; GB1256523A; NL6817365A; JPS4812159B1; IE32582L; YU31973B; DE1812741A1; YU286368A; TR17011A; BR6804632D0; IE32582B1; CH487649A; FR1593473A; NL162556B; US3536061A; GB1256521A; IL31210A0; ES361059A1

Description

BLOOD TUBE IMS 9 In standard evacuated blood sampling tubes is provided a plug in the open end of the sampling tube to seal The plug is dimpled or dished on the inner and outer surfaces so that the center of the plug forms a diaphragm somewhat thinner than the thickness of the of the The thickness of the diaphragm is such that the inner of the needle of the holder used in conjunction with the tube for the taking of blood by the vacuum method be completely imbedded and sealed This construction is necessary so that the blood sampling tube and the holder can be partially preassembled before the placement of the other end of the needle into the vein from which the blood is to be If the parts were not thus preassembled the veinous pressure upon injection of the needle would cause blood to be discharged into the holder or onto the by imbedding the end of the needle stopper is The preassembled unit is normally placed in the vein and then by forward thrust on the the puncturing of the stopper by the needle is completed to withdraw the The procedure and discussed immediately above has several In order to prevent the unwanted of blood into the holder or onto the operator it is necessary that the lumine of the needle be completely imbedded within the stopper in the preassembled At the same time the lumine must not be pushed so far into the stopper that vacuum is lost prior to injection of the other end of the into the vei the thickness of the diaphragm of the stopper must be great enough to date the length of the lumine of the needle and yet still provide enough additional to maintain a vacuum in the is not One at solving this problem has been by the use of graduations or indicating marks on the holder to tell the operator when the lumine of the needle has been fully inserted within the diaphragm without having completely pierced the The use of guidelines is inconvenient to the since it requires a rather careful placement of the within the To avoid reliance upon guidelines on the holder the current practice is to provide a rather thick diaphragm for the the thickness being intended to provide a safety margin in that the lumine can be imbedded in the stopper a substantial distance beyond the required minimum without any danger of premature loss of diaphragm requires more force to complete the puncturing of the stopper from the preassembled The thrust action required to puncture the thicker stopper frequently results in the entire holder slipping slightly forward in the hands of the permitting the end of the needle to jump from inside the vein through the vein wall into the surrounding If the is drawn from the tissue rather than from the vein there results a rather severe hematoma in the arm of the patient which produces a discoloration and To avoid the foregoing problems it has now been found that a blood tube can be fitted with a stopper which does not rely upon the use of guidelines or entail the need for perfect alignment within the In the stopper utilized in the present invention has a thin diaphragm which can be punctured with a very small thereby minimizing the chances of causing a hematoma because of the withdrawal of blood from the tissue rather from the overlying the end of the The end of the tube is normally made by the rough cut glass In any event the end of the tube is tooled or finished in any The only seal for the maintenance of vacuum is vided by the contact of the underside of the peripheral flange with the fire polished end surface the This seal is imperfect the mating surface of the tube is not smooth and uniform even after fire There is relatively little effective seal between the skirt of the plug and the inside walls of the tube because the vacuum within the tube tends to the skirt of the thereby reducing its diameter drawing it away from the tube Since the sealing surface is therefore limited to that between the underside of the plug and the fire polished end of the there is a gradual loss of vacuum during the storage of the blood sampling For this reason it is almost universal practice to ship the evacuated blood sampling tubes in a vacuum sealed The use of vacuum sealed cans increases the storage life of the evacuated but entails an added packaging More the tubes must be packaged in a rather large number in a single container for reasons of the vacuum sealed can must be broken at the time the first tube is The remaining tubes are thereafter stored until usage without the benefit of an evacuated As a result a certain percentage of the tubes are found to be useless at the time they are applied to the taking of blood because of the loss of The present invention eliminates the need for vacuum packing for evacuated blood sampling The present tion provides an evacuated blood sampling tube which can be e ur u n risk of loss of vacuum The invention comprises a novel blood sampling tube for use with a blood sampling tube said tube being provided at its open end with a stopper having along its tudinal axis a thin imperforate diaphragm above said diaphragm which has an inside diameter less than that of the needle to provide a sealing position for the and above said hole a communicating entrance hole having at its widest point a diameter larger than that of said The present further comprises a novel evacuated blood sampling tube and an imperforate resilient the tube having therein an inwardly extending annular shoulder disposed within the normally at a distance from the open end of the tube corresponding approximately to the skirt length of the stopper so that the stopper effectively seals against said shoulder and maintains the vacuum within the The annular shoulder is of a smooth surface so that an effective sealing surface is The shoulder is preferably formed by the tooling of hot glass and hence does not contain any rough surface or irregularities which would permit the escapage of The shoulder can also be in the form an inwardly projecting ledge or most conveniently formed in the molding of a blood sampling tube from In the conventional the vacuum within the tube tends to draw the stopper more snugly against the annular shoulder to aid in maintaining vacuum rather than to increase the risk of loss of Turning to the Figure 1 shows the blood sampling tube of the present invention loosely inserted in the Figure 2 shows the blood sampling tube in the sealing Figure 3 shows the blood sampling tube in the aspirating Figure 4 shows the blood sampling tube in the puncturing or blood drawing 5 shows one form of the novel evacuated blood sampling tube of the present invention in conjunction with a partial view of the conventional type holders utilized with the blood sampling tubes of the present Figure 6 shows the holder and the blood sampling tube of Figure 5 in the blood drawing Figure 7 shows another embodiment of the novel sampling tube of the present and Figure 8 shows the blood sampling tube and holder of Figure 7 in the blood drawing Turning the drawings in greater the stopper 10 in the blood sampling tube 12 is initially loosely positioned in the holder as shown in Figure The blood sampling tube 12 is advanced within holder 14 to the sealing position where the sealing hole 16 having a diameter slightly less than diameter of the needle 13 seals on the inner end or scarf 20 of the needle as shown in Figure While this position is the other end 22 of the needle is inserted in the vein The operator can then tell whether the needle has been inserted properly in the vein or not by drawing back on the tube so that the scarf 20 of the needle is positioned in entrance hole as shown in Figure and observing the inner end of the If the needle has been inserted properly in the the veinous blood will appear in the form of droplets from around the opening in the stopper as shown in Figure If the needle IS has not been inserted properly in the no blood will appear and the operator will it has been established that the needle IS is properly inserted in the the operator again advances to the sealing position which is that 16 of the hole in the stopper 10 having an inside diameter slightly less than the needle 18 and a length sufficient to cover the scarf This transition from the aspirating position to the sealing position does not require any substantial since no puncturing is I the transition can be accomplished quickly so that only a few drops of aspirating blood are permitted to escape before the operator is able to advance the blood sampling tube to a sealing The operator can detect when the needle is fully in the sealing position by feeling the tip of the needle contact the diaphragm there is no need for any guidelines or indicating In a sealing position no veinous blood can since the scarf 20 of the needle is effectively the operator proceeds to the puncturing position shown in Figure This operation requires only a small force because of the thinness of the diaphragm For this reason there is no chance of the operator in applying the force necessary to pierce the inadvertently causing the needle to jump through the vein wall of the patient and cause a The entire length of the sealing portion 16 need not be of a diameter less than that of the It is sufficient if at least at some point along the length of portion 16 the diameter is than that of the needle so that an effective seal is As is any such point seal must be located in portion 16 at a distance from the diaphragm greater than the length of scarf The underside of the peripheral shoulders of the stopper normally rest against the end of the structure of the holder and needle familiar to those skilled in art and hence need not be described in greater detail in The face of the stopper having the entrance hole 26 is preferably domed or convex to facilitate the detection of blood when the parts are in the aspirating this face can be flat or concave and still be provided with the same general type of hole although the detection of the blood in the aspirating position would be more It can be seen that in the invention the novel blood sampling tube provides an aspirating means not with the existing The invention also provides a sure way of avoiding the discharge of blood on the operator without the need for guidelines or a thick In in the stopper of invention the diaphragm normally has a ness equal to only a fraction of the length of the scarf of the As a little force is required to puncture at the time all is in readiness for the withdrawal In Figure 5 the blood sampling tube is shown generally as annular scaling ring 32 is located at a distance mately equal to the skirt length of the stopper The as is standard has a diameter that is slightly less than the inside diameter of holder In drawing of the tube 30 is inserted within holder 36 so that needle 38 punctures the stopper 34 at its center portion In another embodiment of the present invention the stopper 42 is provided with threads 44 to be made up with threads 46 in holder When the threads are fully made up needle 50 punctures the stopper shown in Figure It will be understood that the stopper of this the as shown in Figures 5 and Such structure is fully applicable to the present invention so long as the distance from the underside of the peripheral shoulder on the stopper to the of the skirt is slightly more than the distance from the end of the tube to the annular shoulder in the The essence of the invention shown in Figures 5 through 8 is the use of an annular shoulder in the blood sampling tube upon which the inner end of the stopper may In this way the the tube works to maintain the seal rather than to create sealing problems as in the prior The tubes of the present invention do not require vacuum packing and can be stored at atmospheric pressure for long The shoulder within the tube may be in cross take the form of a ledge projecting at ninety degrees from the tube or be of still other The shape of the shoulder will obviously dictate the shape of the end of the those skilled in the art will be able to construct a variety of mating tions between the shoulder and stopper for the purpose practicing this insufficientOCRQuality

Claims

CLAIMS :

1. A blood sampling assembly comprising an evacuated blood sampling tube and a blood sampling . tube holder, the holder having a .generally tubular bod , one end of which is open for receiving the blood sampling tube, the holder having a needle which is pointed at each end secured thereto, one end of the needle extending into the tubular body and the other end being free for injection into the vein of a patient, and the blood sampling tube having an open end and a closed end and a stopper within the open end, and the stopper having a sealing hole extending along its longitudinal axis , the lower end of the hole being defined by a thin imperforate diaphragm, and the stopper having, above the sealing hole, a communicating entrance hole leading to the face bf the stopper and having a diameter at the. face of the stopper greater than that of the needle. to facilitate the visual observation of blood, and at least a portion of the sealing hole located at a distance from the diaphragm greater than the length of the scarf of the , said one end of the needle having a diameter less than that bf the needle, so that as the tube is advanced into the holder, the said one end of the needle is sealed in the sealing hole, and the tube can be further advanced so that the said one end of the needle punctures the diaphragm.

2. An assembly as claimed in claim 1, in which the body of the holder is transparent.

3. An assembly as claimed in claim 1 or claim 2, in which the sealing hole has a constant cross-section along its length.

4. An assembly as claimed in any one of claims Ί to 3> in which the stopper has a peripheral shoulder which seals on the open end of the tube.

5. An evacuated blood samplin tube for use as part of an assembly for drawing blood comprising a tube having an open end and a closed end, an imperforate resilient stopper in the open end of said tube, the tube having an inwardly-extending annular shoulder within the open end of the tube and integral with the tube, and the inner end of said stopper sealing upon said annular shoulder to maintain vacuum within the tube.

6. A sampling tube as claimed in claim 5> in which said annular shoulder is positioned at a distance from the open end of the tube approximately equal to the skirt length of the stopper.

7. A sampling tube as claimed in claim 5 or claim 6, in which the stopper is provided at its outer end with a peripheral shoulder, the underside of which forms a seal on the open end of said tube.

8. A.sampling tube as claimed in any one of claims 5 to 7» in which the stopper has threaded means for engagement tube with complementary threaded means on a blood sampling/holder so that a needle secured to the tube holder can be advanoed into the stopper on relative rotation in one direction between the stopper and the tube holder.

9. A sampling tube as claimed in any one of claims 5 to 8, in which the stopper has a thin diaphragm-like centre portion recessed therein.

10. A blood sampling assembly comprising an evacuated blood sampling tube as claimed in any one of claims 5 to 9» and a blood sampling tube holder comprising a generally tubular device having a needle secured thereto and being capable of receiving said blood sampling tube so that one end of said needle can be made to puncture said stopper for the drawing of a blood sample into said tube.

11. An evacuated blood sampling tube substantially as herein described with reference to, and as shown in, Pigs. 1 to 4, or Figs. 5 and 6, or Figs. 7 and 8 of the accompanying drawings.

12. A blood sampling assembly comprising an evacuated blood sampling tube and holder for the tube substantially as herein described with reference to, and as shown in, Figs. 1 to · t or Figs 5 and 6, or Figs. 7 and 8 of the accompanying drawings.