US2044691A - Device for collecting the blood at a certain part of the human body - Google Patents

Description

2,044,69T DEVICE FOR COLLECTING THE BLOOD AT A CERTAIN PART OF THE HUMAN BODY June T6, T936., B. HFLINGER Filed June 5, 19.55

Patented June 16, 1936 DEvIoE FOECOLLEOTINGQTHE BLOOD AT A CERTAIN PART OF THE HUMAN BODY Bruno Hilinger, Berlin, Germany Application .une 5, 1935,` serial No'. 25,161-

`In Germany February 26, 1935 l 5 Claims'. (o1. 12s-327) lIhis invention relates to a device for collecting the blood at a certain partof the humanlbody, wherein the pressure medium produces a constriction zone which progresses through the de- 5 vice to the point'wh'erefit is desired to collect lthe blood. In such a device,` Vin accordance with this invention, the pressure mediumis admitted into the device, preferably into the rst chamber thereof if Vthe apparatus comprises a plurality of chambers disposed one beside the other, so that the pressure medium enters these chambers one after the other insuccession and in such a way that the admission does notV cause inconvenience even if the person using the device performs bodily movement during the use'thereof. With this object in viewjin the blood collecting device according to the invention the first annular chamber to be lled with fluid'under pressure "is provided with a small non-return valve, which to a rubber bulb supplying the fluid under Ypres-V sure can be quickly and easilydetached from the valve after having supplied the fluid under pressure.

The invention willi now bemore particularly described with reference tothe accompanying drawing which illustrates several'` embodiments of the invention by wayof example, and Where- Fig. 1 shows the arrangement of the pressure chambers.

Fig. 2 illustrates a fragmentary part of Fig. 1 on a largei scale. Y 1 w Fig. 3 shows a valveV according totherinven- 5 tion, wherein the axis ofthe valve is perpendicular to the surface ofthe cylinderof the device.

Fig. 4 shows a second embodiment? wherein the axis of the valve is tangential to said surface, and Figs. 5 and 6 show'two modifications of the valve member. Y `V Y "Referring to Fig. 1,7`pressure is established in the lowermost 'chamber 2V by means of 'the air admission device f.- The excess of fluid under pressure thenV passes through the short tubular ber '2 into. the adjacent pressure chamber 2c and from this chamber through the tubular connecting memberfll to the next adjacent pressure chamber 2d. Y

In this manner pressure may be established in any desired number of pressure chambers, one after the other. In this connection it is, of course, necessary that the fluid under pressure shall not be able to pass from one chamber to the other without control, but that itV shall be restricted is so constructed that the end of a hose'attached Y connecting member jlll from the pressure chaminits passage by suitable resistances. Such resistancemaypfor example, be provided by introducing into the short connecting tubes fl and jll small inserts fl3 (Fig. 2) provided with jet likepassages fl4 which are veryflne, their diam'- etersbeing only a fraction of a millimetre. By

'suitably selecting these oonstrictions the result may be; Obtained that the fluidl under pressure will pass to the second chamber only after havinglled the nrst chamber, and so forth.

y The blood collecting apparatus according to the invention includes a comparatively unstretchable casing I made of fabric reinforced Vrubberfor the like. Disposed onthe inner side of this casing there area series of flat annular chambers 2, 2c, 2d, whichV are made of highly elastic material andare adapted 'to be filled with fluid under pressure. The chamber Y2 is rst lledwith fluid under pressure,v and as shown in the drawing has an opening in its wall in Vwhichis mounted the valve f. This'valve comprises a valve body 3 slidably mounted in guides inthe valve casing 4v sufficient clearance between thebody and thewalls of the casing'being provided to permit passage of the fluid around the outer endbya member 5 which is secured thereto by means such as screw threads. The valve bodyA has a guide pin `B at its inner endand a 'guide pin 1 at its outer end. The guide pin Vl passes through a bore in the member 5 and has 'sunlcient play therein to permit passage-of the fluid,V while the guide pin 6 passes through a bore in the inner end of the valve casing 4 Vand hasV sufficient play to permit passage of the fluid.

VA pumping bulb ilV is attached 'to be slipped over -the member 5.

InFig. 3 the casing I and the wall ofthe chamber 2 are compressed between a flange in the innerV end of the casing 4 and the member 5 so that when the member 5 is screwed on member 4 the valve f will besecured in position thereby,

Vassisted by the annular projections and grooves ."l4 and l0 provided on the members 4 and 5.

- pumping bulb B, which may be attached thereby in an air tight manner to the valve closing member and yet may be easily detached therefrom.

-valves periphery. 7 The casing 4 is closed at its The end of the member 5 is also concave, and the valve pin 'I extends into this concavity. The latter substantially conforms with the tip of a thumb, which may enter the concavity when it is desired to depress the pin 'I. The end of the valve body 3 adjacent the member 5 is provided with an annular rubber gasket I I, which is adapted to firmly engage in an air tight manner an annular boss I2 of the member 5 when pressure is exerted upon the rear end of the valve body, so thatV the fluid under pressure in the annular chambers 2, 2c, 2d cannot escape after the removal of the pumping bulb 8. VThe Vannular boss I2 has a sharp edge which penetrates deeplyV into the soft rubber gasket II assoon as the pressure at the inner side of the valve body 'risesV above the atmospheric pressure. Y

When it is desired to remove the fluid under pressure. from the annular chambers 2, 2c, 2d, a slight pressure is exerted upon the valve pin `I, so that the air within the chambers, which is at apressure higher` than atmospheric` air, may escape between the rubber gasket II and the annular boss I2. Y Y Y VIn the embodiment shown in( Fig. 4 a coil spring I3 acts upon Ythe inner endrofthe valve body 3. Such a spring may also be provided in the embodiment shown in Fig. 3,Y but it is not essential. In Fig. 4 the air passage tube III'leadingto the chambers 2, 2c, 24d is disposed below the valve body 3. In this embodiment the'packing is effected `byproviding in the outer end of the Vvalve body an annular recess in which is disposed a rubber gasket I5 which may be pressed against an annular projection II4 on the member 5. In addition; an .annular-A rubber gasket II may be provided on the rear V,end of the :closing member 5, for engagement withthe outer end of the valve body 3.When pressure higher than atmospheric is exerted upon the rear end of the valve body, this pressure being assistedby the action of the spring I3. The removal of the uid under pressure fromjthe'annularchambers is effected in this embodiment also by exerting a slight pressure upon the valve pin 1. It should be noted thatit is'preferable to dispose the valve casing 4 in this embodiment substantially tangent to the wall I, this affording better protection against same being torn oilV the cylindercasing; Y

As it is important, that the rubbergaskets make a tight joint when the valve is seatedf even under slight air'pressures and it may be` desirable according to the invention'to use (instead ofthe solid rubber gasket II of Fig. 3) a chamber IIa (Fig. 5) in the outer end of the valve body 3 andV to close this chamber `by a thin rubberdiaphragm IIb, which will make a tighter joint with the annular boss I 27:. The chamber IIa may also be subjected to a small fluid pressure, especially air pressure, which could be effected as shown `in Fig. 6 by providing ducts 5b and 5c, through the pin'I communicating -sons nger.

V phragm IIb acts in this modification like an air cushion.

I claim: 1.*In avdevice for collecting the blood at a certain part of the human body, a plurality of vinflatable V"chambers connected in series and forming. a tube open at its ends; resistances in Y Ythe connections between the chambers for reguy lating the flow of pressure medium from chamber to chamber, said resistances increasing successively in valueV to offer increased resistance to the pressure medium in passing from chamber to chamber; a hollow stem extending from the end chamber whose connection hashthe lowest value resistance; a check valve in said wstem;

means for unseating the check valve to permit vescape of pressure medium from the chamber; vand pressure generating means detachably con'- nected with Ythe stem. l y

2. In a device for collecting the blood at a certainpart of the human body, a substantially nonfexpansible tubular casing open at its ends; a plurality of annularinflatable chambers connected invseries within the casing; resistances in the connections betweenv the chambers for regulating the flow. of pressure medium from chamber to chamber in a direction towards ythe point where the blood is to be collected; s aid resistances increasing successively in value to offer increased resistance to the pressure medium in passing from chamber to chamber; aV hollow stem extending from the end chamber most remoterfrom the blood collecting point; a check valve in said stem; means for unseating the check valve to permit escape of pressure medium from the chamber; and an elastic pumping bulb 1" for supplying fluid under connected with the stem. Y Y

3. In a device as set forth in claim 2, the outer'wall'of the stem being concave and adapted to enter the stretched end of the bulb to maintain the bulb on the stem.

pressure detachably A4. In a device as set forthl in claim 2, said means comprising a member on the valve extending through the stemv and adapted to be Vmanually shifted. -v

5. In a. device as set forth in claim 2, said stem having a shallow recess in one wall; and said means comprising a pinon the valve extending through the stem and terminating within the recess and adapted to be engaged by a per- BRUNO HFLINGER.

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