US2213866A - Blood transfusion syringe - Google Patents

Description

p 1940- v R. P. LANDIS 2,213,866

BLOOD TRANSFUS'ION SYRINGE Filed June 9, 1937 2 Sheets-Sheet I ml, I

WWW RJQLanaQS ATTORNEY p 1949-. R. P. LANDIS 2,213,866

BLOOD TRANSFUS ION SYRINGE Filed June 9, 1937 2 sneets-she t-z INVENTOR I 'R. R Lands Patented Sept. 3, 1940 UNITED STATES angst PATENT orrics BLOOD TRANSFUSION SYRINGE Application June 9, 1937, Serial No. 147,2ilil 4 Claims.

This invention relates to blood transfusion syringes and represents improvements over the syringes shown in my Patent No. 20471726, dated October 20, 1936, and also over the valve mounting arrangement shown in my co-pending application for patent, Serial No. 111,048, filed November 16, 1936.

One of the objects of the present invention is to provide an improved means for mounting the glass body of the syringe in connection with the valved end cap or head, so that the use of a metal coupling ring or the like cemented on the glass is unnecessary, while at the same time the ease and quickness of removal of the cap from the body is retained.

A further object is to provide, as a part of the body mounting means, an improved form of nonslip finger grip, so that there is no chance of the syringe turning or slipping in the hand as it is being used.

Another object is to provide an improved and simplified mounting of the check valves in the head cap, so that both valves may be withdrawn from the outer ends of the cap, and enabling the tube-coupling fittings to be provided with long threaded areas insuring firm mounting and long life.

A further object is to provide a special form of syringe plunger so that coagulating may be avoided.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Fig. 1 is a side elevation of my improved syringe.

Fig. 2 is a cross section of the same on the line 22 of Fig. 1.

Fig. 3 is an enlarged sectional elevation of the head cap and valve unit.

Fig. 4 is a side view partly in section of a special form of plunger for the syringe.

Fig. 5 is a perspective view of an arm band.

Fig. 6 is an enlarged fragmentary section of the same showing the releasable catch means.

Referring now more particularlyto the characters of reference on the drawings, the syringe comprises an open ended transparent glass tube 'I graduated along the outside as usual to indicate the volume of its contents. A glass plunger 3 of usual form slidably projects into the tube "from one end as is customary.

Removably engaging one end of the tube is a head cap 3 having check valves therein as will be later described, while another relatively fiat ring-like cap 4 similarly engages the opposite end of the tube; said last named cap being of course orificed to enable the plunger to project therethrough. The inner end of the head cap is recessed as at 5 to receive and centralize the adjacent end of the tube, a compressible rubber gasket 6 being mounted in the bottom of the recess to engage and form a seal for said end of the tube as shown in Fig. 3. The other cap 4 may be similarly equipped.

Resilient tie rods '3 are secured in sockets 8 formed in the cap 3 on opposite sides of the tube, and extend lengthwise thereof and through bayonet slots S cut in the sides of extensions 9, projecting radially from the cap 4 on opposite sides thereof. Finger nuts it! are adjustably threaded on the free ends of the rods outwardly of the eX- tensions 9 so as to drawthe caps together and seal the tube firmly against the gasket 5.

The rods intermediate their ends are formed with longitudinally extending undulations or waves ll disposed in planes radially of the tube. These serve two functions. In the first place, they provide grips for engagement with the fingers of a hand surrounding the tube, so that the chance of the syringe slipping relative to the hand with the advancing pressure of the plunger is avoided. In the next place, the rods being resilient, a yieldable tension is set up therein when the nuts it] are tightened up, which tends to prevent possible fracture of the glass in the event that said nuts are turned up to an excessive degree.

The head cap 3, on the same side as the sockets 8, is provided with outwardly diverging tubular cylindrical projections 12 and it. A donor-tube fitting M provided with a threaded base portion I5 is screwed into the projection 52 for a certain portion of its extent, while the recipient-tube fitting I6 is similarly provided with a threaded base portion H which screws into the projection l3. The portion ll is larger in diameter than the portion l5 so that there is no chance of the fittings being reversed in position.

Passages l8 and 19 are formed in the cap and projections and lead from the inner ends of fittings M and I6 respectively to the inner face of the cap, the passage l8 being larger. in diameter than the passage Hi.

The intake and the outlet check valves to and 2| respectively, which cooperate with the fittings l4 and I6, are of soft rubber of generally tubular shown in the copending application above referred to. Each is provided at one end with rela- 1 .tively flat converging self closing and normally closed lips 22. These are designed so that they will separate to allow of a flow therethrough only with pressure within the tubular valves.

At their opposite end the valves are provided with outwardly projecting annular flanges 23. The intake valve projects into the-passage f8 and its flange 23 seats against a shoulder 24 formed in the projection l2 at the bottom of the" tapped portion thereof and is engaged on its outer face by the bottom of the fitting l4 when the latter is screwed into place. In this manner a secure seal between the valve and cap is provided posi-- tively eliminating the chance of leakage around the valves.

The body of the valve 2| projects into the fitting l6, so that it thus faces in the'opposite.

direction or outwardly from the tube 1 and its flange 23 is seated in a recess 25 provided in the bottom of said fitting Hi. This recess is shallower in depth than the flange so that the latter projects somewhat beyond the flange and seats against a shoulder 26 formed about the outer end of passage Hi. In this manner this valve also is firmly sealed against possible leakage therepast when the fitting I6 is screwed into place.

Though the valves are identical in size they cannot be misplaced in position since the passage I9 is of insufiicient size to receive the valve body while the bore of the fitting I4 is likewise of insufficient size to receive the valve.

If desired, the special form of plunger shown in Fig. 4 may be used in place of the usual form illustrated in Fig. 1. This special form of plunger is a hollow member 21, adapted to receive an anticoagulating solution, and is provided toward its 40.

inner end with relatively small holes 28. The

outer end is closed by a stopper 29 on which is I mounted a collapsible air bulb 30 communicating with the interior of the plunger by means of a small passage 3| through the stopper.

By providing the holes in the plunger in the manner described the natural frictional surface contact between the cylinder and plunger is replaced by the film of solvent material having lubricating qualities. This material may be eitherv a saline solution, a solution of sodium citrate,

mineral oil or any other suitable anti-coagulat- 1 ing solution or lubricant.

The bulb stopper is, of course, employed in such a manner as to permit constant pressure on the ing the operation. Due to this great advantage it will be obvious that much less anti-coagulating 1 solution will be required to be introduced directly into the blood and render it possible to make a transfusion with substantially unaltered blood.

Furthermore the pressure exerted by the bulb .will counteract the tendency of any blood to creep up between the plunger and cylinder walls and will thereby maintain this area filled with the dilutant lubricating solution. This affords the same advantage as would a fresh syringe for each forward and backward action of the plunger of my improved syringe.

I also provide, as a part of the transfusion apparatus, a novel form of arm band. This comprises a resilient metal strip 32, provided with a longitudinal row of holes 33and secured at one end on a rectangular sleeve 34 through which the opposite end of the strip may freely slide.

Means to releasably hold said end of the strip in any selected position in the sleeve is provided inthe form of a spring pressed U shaped member 35, one leg of which projects lengthwise into the sleeve and carries a pin 36 adapted to project through any hole 33 and to seat in a hole 3'! in the outer face of the sleeve. The other leg of the member 35 extends over said face of the sleeve normally at an acute angle thereto, and forms a depressible release element for engagement with the finger. The member is spring hinged as at 38 on the sleeve at one end at the corresponding end of the outer leg, and the bottom or cross piece of the U is slotted as at 39 to receive the strip 32 so that the latter enters the sleeve between'the inner leg of the catch mem-.

natural resiliency of the strip will cause it to eX-' pand, the sleeve engaged portion thereof now being free to slide out. 7

When inserting the strip into the sleeve and past the catch device, the pin 35 is depressed clear of hole 3i. The end of the strip engages the exposed end of the pin, which being cone shaped,

allows the strip to readily pass over the pin.

From the foregoing description it will be readily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the de-. vice, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention, what I claim as new and usefuland desire to secure by.

Letters Patent is: p

l. A blood transfusion syringe comprising a tubular body, opposed end caps removably engaging the ends of the body, tie rods extending between the caps, and means between the rods and one cap to draw the caps toward each other and place the rods under tension, saidrods being of resilient material and being formed with 1on gitudinal undulations deviating from the axial lines of the ends of the rods.

2. A blood transfusion syringe comprising a tubular body, opposed end caps removably engaging the ends of the body, one cap having .opposed radial extensions, tie rods secured in the other cap on opposite sides of the body and projecting through and beyond the extensions,

and adjusting nuts on the outer ends of the rods,

the extensions having bayonet slots open to one side of said extensions to receive the rods there'- through.

3. In a blood transfusion syringe, a head cap, a tubular outlet fitting having a base, a member on the cap having a bore to receive said base, there being a passage leading through the cap from its inner face to and smaller than said bore whereby to form a shoulder at their junction, a

flange projecting into a recess formed. in the fitting at the bottom thereof, the bottom of the flange being clear of the fitting and seating on said shoulder.

4. In a blood transfusion syringe, a head, said head having a pair of separated passages leading therethrough the inner end portion of each of which is relatively small whereby to form a shoulder at its junction with the outer portion and the inner portion of one passage being larger than the inner portion of the other passage, a pair of identical valves each including a tubular body and an enlarged base flange, the flanges of both therein, and another fitting projecting into the 10 outer portion of the one passage and engaging the base flange of the corresponding valve.

RICHARD P. LANDIS.

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