US2015574A - Transfusion device - Google Patents

Description

Sept. 24, 1935. A, WEBB 2,015,574

\ TRANSFUSION DEVICE Filed 7 April 30, 1935 FIG 1 Q INVENTOR. 3:3? I 1 Q. m

ATTORNEY.

Patented Sept. 24, 1935 orrilcs 5 Claims.

This invention relates to new and useful improvements in pump mechanisms particularly adapted for use in the medical and surgical professions for the transfusion of blood, intravenous medication, withdrawal of fluids from serous cavities and the like, and it is among the objects thereof to provide an apparatus of simple, compact construction which shall be efficient in its operation and reliable for use in serious surgical operations.

A further object of the invention is the provision of pumping mechanism which, when employed for direct blood transfusions, will function to Withdraw the blood from a donor and deliver it to a recipient in a substantially continuous stream, the blood being out of the veins the briefest time practicable during which time the motion of the blood is substantially continuous.

In the type of blood transfusion apparatus commonly in use, known as the syringe type, the blood is stagnant at intervals causing it to clot, one stagnant condition being during the charging of the syringe and another in the receiving tube while the syringe is being discharged.

The present apparatus eliminates these difficulties and permits the transfusion of a large volume of whole blood because of less opportunity for clotting.

The before-mentioned objects of the invention will become more apparent from a consideration of the accompanying drawing constituting a part hereof in which like reference characters designate like parts and in which:

Fig. 1 is a front ele'vational view of a pump mechanism embodying the principles of this invention; and

Fig. 2 a rear elevation of the top portion thereof with the frame partially broken away to illustrate the pump valve mechanism.

In the drawing, the numeral I designates a base on which is mounted a standard 2 for supporting a disk 3 which is hollowed-out at 4. The outer periphery of the disk is provided with a track 5 for supporting a flexible tube 6, the track 5 being interrupted at l and 0 at which portions the tubing 6 is drawn into the cavity 4 of the disk, one terminal of the tubing being designated by the numeral 9 and the other by the numeral I 8.

Disk 3 is provided with a shaft I I for receiving a crank 12 having a handle l 3 at the extended end thereof and a roller I4 journalled on the handle end of the crank. Upon angular movement of crank [2, the roller M engages the flexible tube 6 in the'manner indicated in dotted lines in Fig. 1, and in traversing the outer periphery of the tube 6, the roller controls the flow of fluid therein by creating a suction behind the roller and pressure in front of the roller which is productive of the pumping action of the mechanism.

The crank it is further provided with a earn it that cooperates with a lever l6 pivoted to disk 3 at H, the upper surface of lever it being adapted to contact and squeeze the flexible tube 6 at the time roller i0 is out of contact with the tube 6, as shown in the drawing. Sections of flexible tubing is may be connected to the terminals 9 and it of the tube 6 and the tubing it may be provided with glass adaptors 0 for making connections with hypodermic needles or cannulas inserted in. blood veins.

Mounted on the standard 2 is a bracket 26 on which is mounted a counter mechanism 2i secured by clamp Zita having a lever 22 which extends in the path of travel of the roller M which, in its angular movement around disk 3, trips the lever 22 which actuates a counter mechanism to register the number of revolutions of the crank, and in addition serves as a positive lock against reversal of operation to prevent flow of a recipients blood to the donor. Clamp 26a permits the removal of counter 22! if it is desired that all other parts of the apparatus be sterilized.

One of the important features of the apparatus is the provision of means for preventing the stretching of the flexible tubing 6 behind the roller and the piling or humping of the tubing ahead of the roller.

To this end, a strip of inelastic tape 6a is cemented or vulcanized to the tubing over that section traversed by the roller. The fabric of the tape prevents the longitudinal stretch of the tube. By looping the tubing over the terminals '5 and 8 and drawing the ends through the openings in disk 3 as shown, movement of the tube on the disk periphery is prevented and any tendency for the roller to work the tubing around the disk and choke off the lumen at the point Where the intake end leaves the periphery of the disk is off-set. The end of the inelastic tape 6a is shown anchored by pin 5b on disk 3.

While the apparatus has been described as particularly adapted for the transfusion of blood, it may also be employed for intravenous medication delivered either over a short period or continuously by operating the device with a motor.

In operation, the roller I4 is drawn over the tubing 6 by means of the crank 12, the roller closing the lumen of the tube as it moves forward. producing a suction behind and pressure ahead. During about 40 of each revolution of the crank, the roller is not in contact with the tube, and at this interval, the cam l5 and lever l6 close the tube to prevent back flow and loss of pressure. By employing the fabric tape as surfacing material for the tube 6, a smooth rolling action is obtained that eliminates the tendency for the tube to creep, and the apparatus will function continuously to pump blood in a con tinuous, steady, unclogging flow without any stagnant periods excepting the momentary passing of the roller across the gap of the tube.

Also the herein-above described apparatus is adapted for immediate use in successive transfusion operations by replacing the entire tubing 6 without intermediate cleaning operations so necessary in the employment of the syringe type device.

Although one embodiment of the invention has been herein illustrated and described, it will be apparent to those skilled in the art that various modifications may be made in the details of con struction without departing from the principles herein set forth.

I claim:

1. Apparatus for transferring fluid comprising a support having a cylindrical surface, a conduit having a receiving and a discharge end, a portion of which conduit is supported on the cylindrical surface of said support, a roller mounted for angular movement around the outer cylindrical portion of the tubing in intimate contact therewith, and valve mechanism for closing the lumen of the tubing when the roller is out of engagement with its cylindrical surface portion.

2. Apparatus for transferring fluid comprising a cylindrical support having a crank mounted concentric therewith, said cylindrical support having a flat and slotted portion, a flexible tube mounted on said cylindrical support forming a gap at the fiat and slotted portion thereof, a roller mounted on the crank to engage and compress the tubing when the crank is subjected to angular movement, and means operative in response to movement of the crank to close the lumen of the tubing when the roller traverses the flat portion of the cylindrical tubing support.

3. Apparatus for transferring fluid comprising a cylindrical support having a crank mounted concentric therewith, said cylindrical support having a segment portion removed therefrom, a flexible tube mounted on said cylindrical support forming a gap at the segment portion thereof, a roller mounted on the crank to engage and compress the tubing when the crank is subjected to angular movement, and means comprising a cam and lever actuated by movement of the crank for closing the lumen of the tubing during a portion of the travel of the roller.

4. Apparatus as set forth in claim 1 characterized by the tubing havinga fabric material on the outer surface thereof to prevent stretching of the tubing by the roller.

5. Apparatus for transferring fluid comprising a cylindrical support having a crank mounted concentric therewith, said cylindrical support having a flat portion, a flexible tube mounted on said cylindrical support forming a gap at the flat portion thereof, a roller mounted on the crank to engage andcompress the tubing when the crank is subjected to angular movement, means in the path of movement of the crank for preventing complete rotation thereof in one direction, and means responsive to the movement of the crank for closing the lumen of the tubing when the crank roller is out of contact therewith.

PAUL A. WEBB.

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