US2727517A - Blood collecting apparatus - Google Patents

Description

Dec. 20, 1955 w. A. WILKIN 2,727,517

BLOOD COLLECTING APPARATUS Filed 001;. 4, 1954 IN VENTOR ATTORNEYS United States Patent Ofiiice 2,727,517 Patented Dec. 20, 1955 2,727,517 BLOOD COLLECTING APPARATUS William Arthur Wilkin, Centralia, Ill. Application October 4, 1954, Serial No. 460,113 5 Claims. Cl. 128-276) This invention relates to improvements in blood drawing instruments, designed to draw blood by pressure from within the body, and while the device is adapted for various purposes, it is especially designed for extracting samples of blood from cattle and live-stock, for testing in the laboratory. sample from the animal, the animal frequently becomes obstreperous, resulting in breaking of the bottle or sample tube and possible injury to the veterinary.

The primary object of my invention is the provision of a holder for the blood sample tube, which shields and protects the tube and which holder forms the support for the hypodermic needle.

It is another object of this invention to provide a blood drawing instrument of the type described in which the means for holding the blood vial and tubular needle are constructed and arranged so that these parts may be readily assembled and disassembled upon completion of the blood drawing operation in an expeditious manner.

Another object is to provide an improved device wherein the ditference between blood pressure and atmospheric pressure is utilized for extracting blood without the use of a vacuum.

Features of the invention, other than those adverted to, will be apparent from the hereinafter detailed description, when read in conjunction with the accompanying drawings, where:

Fig. l is a side elevation of my improved bleeding tube holder.

Fig. 2 is a side elevation of a hypodermic needle, which my apparatus is adapted to accommodate.

Fig. 3 is a side elevation of a blood sample tube, and

Fig. 4 is a vertical section of my apparatus assembled with the needle and sample tube in place.

Referring now to the drawings it will be observed that the instrument comprises essentially three separable elements, the blood sample tube, the holder and the hypodermic needle. The method of assembling these elements for use will be apparent from consideration of Fig. 1. The two parallel elements, 1 and 10, are conveniently circular in cross section and are separated at either end by the cap plates 2 and 3. The central section of cap plate 2 has been thickened to provide support for the needle when it is in position, and this cap plate has a recess 4, to receive the knurled collar 5 of the needle illustrated in Fig. 2. An optional improvement slight indentation in the surface of cap plate 3 to accommodate the bottom of the sample tube of Fig. 3. The presser plate 7 slides on the rods 1 and 10 and is freely movable between the cap plates 2 and 3 in a direction parallel to the rods. The presser plate 7 is integral with a discharge tube 8, which has an inside diameter slightly larger than the outside diameter 9 of the needle illustrated by Fig. 2. The length of tube 8 is greater than the thickness of stopper 11 of Fig. 3, and the opening adjacent to cap plate 2 may be flared slightly, as illus- In the process of extracting the trated, to facilitate the escape of air which may be displaced from the sample tube.

In assembling the blood collecting apparatus for use, the presser plate 7 is moved toward cap plate 3 which enables one to fit a sterile needle in the cap plate 2 so that the knurled collar 5 is retained in the recess 4. The presser plate 7 is then moved forward to contact the cap plate 2, so that the rear end of the needle 9 extends through and beyond the breather tube 8 thus holding the needle firmly in position. The sample tube of Fig. 3 is then positioned by lining up the bore of stopper 11 with the needle and tube 8 and gently pushing on the end of the tube until the needle passes through the stopper permitting the end of the sample tube to be wedged against cap plate 3. The assembled instrument is illustrated by Fig. 4.

When it is desired to extract a sample of blood, the needle is inserted to tap any desired vein or artery. It

will be noted that the breather tube 8 forms a vent from the sample tube to the atmosphere as the adjacent surfaces of presser plate 7 and cap plate 2 do not form an air tight seal. The blood pressure of the body being greater than atmospheric pressure, the dilference in pressure will cause blood to be forced through the needle into the sample tube. When the desired amount of blood has flowed into the sample tube, the needle is withdrawn and the sample tube removed from the holder by moving the bottom end of this tube out and away from the needle. The used needle may be quickly replaced with a sterile one and a new sample tube wedged into place.

It will be apparent from the foregoing description that the bleeding tube holder of this invention embodies many advantages. It is simple in construction, has a minimum number of moving parts, and is economical to manufac- It may be constructed of any non-corrosive metal or of plastic; and may be kept clean and in sterile condition without the exercise of undue care. The convenience of drawing blood into a tube which may be also used for centrifuging is of importance, since it is not necessary to transfer the blood after coagulation into another tube. The ease and firmness with which the needle may be attached to the test tube, as well as the fact that the test tube may be employed as a handle for the manipulation of the instrument, enables said instrument to be made relatively small and compact.

From the aboi e description it will be seen that I have provided an improved device by the use of which it is possible to dispense with the costly and inconvenient vacuum tube receptacles commonly employed in devices plate is moved to contact it.

2. An adapter for a hollow needle adapted to be detachabl connected to a tube for collecting a blood sample y drawn through said needle comprising in combination agaasr'z a R S9 Plate e uat s. 1 u ?v Estrella ests t! 39!- able in the direction of theitf axes, a discharge tube extending through the presser plate; said rods being sepaa ed by we p ates: aerp mticulat heir'ates e bat-i tom cap plate being recessed to xgec the closed; end.

f a w a ube; he ea ea P at ha i an Op n n a apt o rece v a ne d e nd 9 nos tie tdi tha t e s r w the d s ha e b wh he P 26 562 P ate ismoved to contact the bottom cap plate.

3 An adapter for a; hollow needle adapted to be detaehably connected to a tubefor cOlleet-inga blood sample d awn.- t s a d n edle l nnr n. c mbi ati n a PIQ IP1 IQ mo nted. n wo; parall r d and: maxb e in th di e t no eir axes, a charg ube x endin li q h h Ptt sr Pl t 1 a r ds e n enatat di a itastes t t ah he le e s mat m d ay b tween at} rag a d in. a a axxetht qahthe t Q2 Ail I 9 being separated a distance greater than the diameter of a bleeding tube by cap plates. perpendicular to their axes; the bottom cap plate being recessed to receive the closed end of a bleeding tube; the top cap plate having a recessed annular opening adapted to receive a needle so positioned that it registers with the discharge tube when the presser plate is moved to contact the bottom cap plate.

5. The bleeding tuh holder comprising in combination a presser plate mounted on two parallel rods and m v ble in. he d rec ion x f; the r: a dischar e: be extending through the presser plate midway between said rods and in a plane through their axes; said rods being separated a distance greater than the diameter of a bleeding tube by cap plates perpendicular to their axes; the bottom cap plate being recessed to receive the closed end of a bleeding tube; the. top, cap plate having a; slnt'. adapte to: receive a, needle and o po itiazned; hat it egis er with the'discharge tube when-the.- press n plate ismoved to ontact the bottemi. ap, plate.-

2,437,408 s Mar. 9, 1948

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