US1866217A

US1866217A - Piston pump for medical purposes

Info

Publication number: US1866217A
Application number: US357275A
Authority: US
Inventors: Mayer Charles
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-04-30
Filing date: 1929-04-22
Publication date: 1932-07-05
Anticipated expiration: 1949-07-05

Description

July 5, 1932. c. MAYER PISTON PUMP FOR MEDICAL PURPOSES Filed April 22. 1929 l l 1 l l l l l n .J

Patented July 5, k1932 CHARLES MAYER, or :PARISQFRANCE PIs'roN PUMP For. MEDIQATJ vPUnrosns Application sled April 22, 1929, serial No; `357,'2`75",'.f.p1a in france April 3o, 192s.

The present invention has reference to a piston pump for medical purposes of the valveless type and as its object embraces the provision of a pump of the above character' wherein improved operating means is pro-` vided for imparting to the piston a continuous rotary and reciprocatory movement.

Briefly stated the invention may be said to consist in the provision of a crank directly connected with the piston for effecting rotation thereof and provided with a finger movable in a cam slot which is fixed relatively to the pump barrel for simultaneously impart-- ing to the piston reciprocatory movement.

The invention also embraces the provision of a piston pump of the above character wherein the parts are constructed so that they may be rapidly assembled and taken apart with a view of sterilizing the elements.

Other objects as well as the nature, characteristic features and scope of the invention will be more readily apparent from the following description taken in connection with-A the drawing and pointed out in the claims forming a part of this specification.

The accompanying drawing illustrates, by way of example only, a medical pump constructed in accordance with the invention, and in which :fp

Figure 1 is a vertical longitudinal section of the pump in its entirety.

Figure 2 is a partial section of the pump barrel, made through a plane at right angles to Figure 1 showing the suction and delivery ports.

Figures 3 and 4: are diagrammatic views showing the cycle of operation of the pump.

Referring more particularly to the accompanying drawing in which similar characters of reference designate corresponding parts throughout the several views there is provided a pump barrel in the form of a glass cylinder or tube 1 perfectly calibrated internally and on the upper part of which fits the bottom 2 of a metal armature extending down to the lower edge of the tube 1 so as to constitute a socket 3 screw-threaded at 4. The armature is provided with arms 5 and with perforated bosses 6 and 7 which constitute 50 nozzles on which are secured the suction and and of small dimensions.

delivery pipesy (not shownin the drawing). The passage-ways YofV the nozzles coincide with orifices or ports 8 v and 9 provided through the wall 4ofthe tube 1. The armature' isV sealed on the glass by any suitable cement resistant to a prolonged stay in boiling water or in sterilizing stoves-"as well as to the attack of the different antiseptics.

The piston comprises' a cylindrical metal body 10 thelength of which is, as that of the pump barrel, important relatively to 4the stroke, for thevdouble purpose of ensuring a perfect guide action and to obtaina fluidtightness without having recourse to packings or specialdevices.

A rod 11 secured to the piston 10 or in one piece with the same, is arranged in the axis of the said piston and provided with acrank arm 12 having an operating handle 13 and a boss 111.` On'the latter is secured, at right angles to the axis of the pump, a finger 15 which serves as a spindle for a roller 16, guided between the flanges of` a cam-slot 17 formed in a sleeve 18 internally screw-threaded for screwing on the threaded portion 4 of the armature. VThe shape and orientation of the cam-slot 17 are determinedaccording to the stroke adopted andvaccording to the law of movement of the reciprocating displace.- ments of the piston.

This law can obviously be ofpany kind for a medical pump usually `actuated by hand Thus, for greater simplicity, the flanges of the camslot 17 are plane and inclined relatively to the axis of the pump according to the stroke to beimparted'to the .piston10. The sleeve 18 is secured on the pump barrel so as to provide a space, as reduced as possible between the bottom 2 and the piston when it is at the end .of its stroke. Relating to the angular orientation or setting of the sleeve 18 relatively to the pump barrel, it can be determined by reference marks or by abutments for causing the ports 8 and-9 to coincide with grooves 19 and 2O provided on the side surface of thev piston 10, according'to the required cycle of operation.

The

grooves

19 and 20 of the piston 10 are -homologous curves ofthe cam-slot 17.

rlhey open in the bottom of the piston and correspond, one to the inlet port, the other to the delivery port.

The operation of the pump thus described may be reviewed as follows. If, for instance, it is desired to make an injection, the

suction nozzle 7 is connected throughA a pipe,

to the needle '(not shown), Whilst the delivery nozzle 6 receives a pipe (not shown) for discharging the pumped liquid. The

pump barrel being held'l in one hand, the.

plston is caused to Continuously rotate with the other Vhand by meansof the crank;Y itV receives atthe same time reciprocating translations. During the downstroke (Fig. 4)` the groove 19 moves opposite the suction port 8 and vthepump barrel fills up with the suckedv liquid. `At the end of the down stroke, the groovel9 ceases to be in contact i with the port 8, and during the up stroke the Vgroove 20:1noves opposite thef-port 9 through which is delivered the liquid'previously sucked. f After use, the pump can be rapidly taken apart. In fact, it suflicesto unscrew the sleeve 18 for separating the piston from the Y pump barrel and to veryV easily effect the washing and sterilization lof these elements.

What I claim as my invention land desire to secure by Letters Patent is ze i Y 1. In apiston pump for medical purpose Y of the valveless type, a pump barrel, a rotating and reciprocating piston therein, a

hand crank upon the piston'for rotating thev same, a radial finger upon the said crank,

la roller freely mounted upon the said finger,

two inclined flanges upon outer surface of Vthe pump barrel and forming guiding members for the roller placed between them.

2. In a piston pump for medical purposes of the valveless type, a pump barrel, having an inlet and an outlet in its side walls near its outer end,.a rotating and reciprocating piston in the barreha hand crank uponthe piston for rotating the same, a radial finger upon the said crank, a roller freely mount- V ed upon the said finger, a socket jat the inner A Y end ofthe pump'barrel adjacent to the crank,

twoV inclined flanges upon the said socket for receiving betweenthem thev roller and to impart to the piston a reciprocating movement in the barrel duringV the rotation of the crank, f and means for readily connectingor separating the said socket and the pump barrel.

u In testimony whereof I have signed this specification. Y I

CHARLES MAYER.