US2393728A - Nozzle for duodenal pump tubes - Google Patents

Description

Jan. 29, ,1946. C. DE PQAGUIAR 2,393,728

ANozzmi: Fon` DUODENAL PUMP TUBES Filed Sept. 23, 1944 I i W1 i v l '4 INVENTQR CLovls de Paw@ Aguiar mgmwi .A'rroRNEm Patented Jan. 2,9, 1946 UNITED" STATE s PATaNror Fics In Brazil October 19, 1943 3 claims. (omas-276) The present invention relates to improvements in the nozzles of apparatus for the pump treatment of sinuous organic channels and, more particularly, in nozzles or tips for duodenal pump tubes. L

In my U. S. Patent 2,356,659, issued on August 22, 1944, I have described a tip for a duodenal pump tube which is so constructed that liquid pumped through the tube emerges from rearwardly directed openings provided in the tip in order to propel the tip and the attached tube in a forward direction through the duodenal channel.

I have found that in a device of the type set forth in my prior patent the most satisfactory propelling eiiect is obtained if Ythe cross-section of the rearwardly directed outflow openings provided in the tip is kept comparatively small so that the liquid is caused to emerge 4lromthe tip in the form of thin jets of great velocity. When the tip has reached the desired position in the duodenal channel, it is possible to inject through such small openings a suiiicient quantity of liquid by forcing the liquid under suitable pressure through the tube and tip. However, difficulties have been encountered if it is desired to use a tube having a tip with small openings for the removal of liquid from the duodenal or any other organic cavity by suction, because, in this case, strong suction forces act on very limited areas instead of a desirable more uniform suction force actingvonalarger area.'v Y l 5 One object of the present invention is to overcome this disadvantage and to provide an apparatus for the pump treatment if sinuous organic channels which can be used with equal efficiency for the propulsion of the tip and tube through the organic channel and the injection of liquids through the tip into the organic channel and also for the removal of liquids from the channel by suction. y

Another object of the invention is to provide a duodenal pump tube including a tip with a rearwardly directed outiiow opening of variable crosssection. LA further object of the invention is to provide an apparatus for the pump treatment of sinuous organic channels including a tube and a tip with a rearwardly directed iiow passage in which the cross-section of the ow passage is automatically reduced when liquid is pumped through the tube and tip and hence out through -the passage, whereas the cross-sectional area of the flow passage is automatically restored to its normal larger size when liquid is sucked through the tip into the tube.

A stili further object of the; invention is t0 provide a tipof thetype set forth'whichcan be easily manufactured, assembled,` r.taken apart,` cleaned and reassembled and to which the tube can be attached in a simple manner. Y

According to the invention, Iaccomplish these objects by the arrangement andcombination of parts set forth in the following 4detaileddescrip-- tion, deiinedin the appended claims and illustra,-1 tively exemplified in the accompanying drawing inwhichrf .v'

Fig. 1 is a side elevation of a tip according to the present invention with the attached end of the tube. v v v Fig..2 is an axial section through the tip with-l outthe tube. f j K Figs. 3 and flare Vsections similar torthat of Fig. 2, but with the tube attached to the tip and showing two different operative positions, respectively.

Fig. 5 is a perspective ofthetip. Y

Fig. 6 is an exploded perspective view of the tip without the tube holder. n

Fig. '7 is aseparate perspective view of the tube vView of` the cover portionV` holder and n Fig. 8 is an exploded perspective vi-ew of the tip with the wall of the lowertip portion `partly broken away toshow the inserted tube holder.

The tip according to the present invention com-` prises a cup shaped rear :portion II having a come` paratively large cavity I2 provided with an internal screw thread I3 adjacent its upper edge and with an annular shoulder I4 a short distance below the screw thread I3. An axial bore I 5 having a diameter exceeding the normal outer diameter of the elastic tube I6 in its not distended condition permits passing of the end of the tube I6 from the outside` into the cavity I2. The difference between the diameter of the bore I5 and the normal diameter of the tube I6 is such that the concentric flow passage I5a formed between the bore I5 and the tube I6 in its distended condition has a cross-sectional area smaller than the inner cross-sectional area of the tube I6. The end of the tube IG is fixed in the cavity I2v by means of a tube holder (see Fig. 7) which consists of a short tubular element I1 of an outer diameter approximately equal to that of the tube I6 in its normal not distended condition said tubular element I1 being provided with annular grooves I8. At its upper edge, the tubular element Il is formed with three flat uniformly spaced radial projections I9 which seat on the shoulder I4 when the tube holder is inserted into the cavity I2.

When the tip is assembled with the tube, the tube I6V is passed through the bore I5 untilvits end emerges from the cavity VI2 to a suicient extent to permit freeY manipulation thereof, and this end is then pushed, outside of the cavity I2,

\ vonto the tubular element I1 on which it is re- Ytained byfriction augmented by the grooves I8. AIf necessary, additional precautions may be taken to ,secure theattachment of thetubetolhe Lube holder. Tii'enathe tube le is puueagbeek through the boreV I5 until the projections' I9 fthetubula liquidlfrom the inner end of the tube I6 toward element I'I are seated on the annular flange I4, Y,

of the cavity I2.

The cavity I2 is closed by means ofthe cover which is shaped to form with the rear,-portion Il a smooth bulb-shaped unit having a rounded screw-thread 2| which screws'into theinternal screw-thread I3 of the cup Vshaped portion I'I'.'

The innerfaceiofifthe cover=20 isforrned'with a rearwardly pointingffdeector surface, which, when the cover hasbeen screwed'home, has its apex 22ldisposed2in alignment with the axis of the tip near the-inner endof the inlet passage formed byy thejtube I6 andtubular Velement I1,

saiddeflector surface including concave Walls 23v to vguide the liquid emergingv from the Vtub smoothly toward the annular' passage 15a.

Y The Adevice operatesas follows: When liquid isY pumped through the tube I6 into the tip cavity I2,V

the pump pressure, aided bythe smaller'V flow cross-sectionof the passage I5a as compared' to that of the tube I6. acts on the wall portion' of the YelasticY tube |61 disposed in the bore I5 todis-y tend this wall portion',-as shown in Fig':4,'thereby decreasing the' size of the ilowl passage V15a' and causing the liquidto emerge from the tip in the for-m of a thin'walled cylindrical jet'of considerable velocity which exerts a comparatively large propelling force oriv theftip.y f f When the pump action is discontinuedl andffor l instance, a suction force is applied to-tl'ieV tube I6,

the wall portion of the latterin the bore I5` returns to its original'size zCsee Fig. 3) andthe crosssection of the annular passage I5a is accordingly enlarged, thus facilitating thesucking of liquid through thetip intothetube. I

It w'illfbev noticed that `the spaced` projections I9 of the tubular. relement I1 iwhichisupport the latter .inthe' cavity-:I2-d'o not impede the ow kof the passage I5avor vice versa to any noticeable extent. v

I claim:

1. In an apparatusl Vfor the pump treatment of Vsinuous organic channels, the combination with an elastic tube of a tip comprising a'bulb shaped bodyV having a rounded forward end and being provided withA an internal cavity of, supstantial i Yfnffcl ch the e'd of 'said ube passes into said cavity, said bore having a diameter exceeding the normal outer diameter of said tube `VYVin' the not distended condition of the latter so as front end. Along its peripheral"edgvejthelcover.;v 20 is recessedv and providedV with anV externaltoleave between said bore and tube an annular iiow passage, and means for holding the inner end of-said;tube.1in said'fcavity so as to permit the free -owbf liquid between the yinner end ofthe f tube and said annular flow passage, whereby the Vfull cross-'section of said flow passage is available for-zliquid; :suckedv` therethrough -into Vsaid cavity and hence-finto the tube while the cross-sectional t area of 'said annulariflowapassage is reduced :due tothe distentioniof thewall portion of said-tube located in said Vbore when .liquid is 'pumped throughthe tube.v into said'cavity and out through said'low passageV f 2.,-An apparatus,r as,t claimedain lclaim Y1, in which the frontwall `of said cavity opposite said bore-'is provided with? a rearwardly pointingdeflector surface having its apex in'align'ment with the axisr offthe tip and Vin 'cluding concave walls to guide liquid vemerging fromA the tube into said cavity` smoothly'towards said annular flow pas-l y sage, said tubeand tube-holding means cooperatingtoform an axial inlet passage leading into said,` cavity tor a point'near the apex of said de- 3.' 'app'aratu`s,` as- .claimedfinY-claim l; in whichvv said tip includes a' rear portion provided with; af 'cup-'shapedcavity having at 'a distance fromits 'rim' an inwardly projecting annular shoulder anda removable cover shaped to form with said -rearportion-asmooth bulb-shaped unit, Y

and said tubeholdingmeans includes av short tubular ,elementaxially Varranged in said Ycavity and havingther inner end of said 'elastic tube mounted thereon; said tubular element being pro# videdatiit's- `:Erontenr i wthspacedredial preme-Y tions-to seat-on saidannularshoulder., j u* l Q. r CLOVISVDEQI? 'i A AGUIAR.

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