DE7624077U1 - VOLUMETRIC PUMP - Google Patents

Description

PATCNTANV. '* LTE

Dr. -!.:. ί. HANS RUSCHKE
DipL-Mg. OLAF RUSCHKE
DipL-lrG. HANS E. RUSCHKE
A 65

1000 Berlin 33

Imed Corporation, San Diego, California, V.St.A ₁

Volumetric pump

The invention relates to _a% volumetric Infustionspumpe for intravenous administration of fluids to patients with a volumetric cassette for receiving a liquid from an IV fluid reservoir and pumping this liquid at a controlled rate by means of a IV-Verabfolgungssatzes, administered until a predetermined volume of fluid to the patient has been. When filled, the volumetric cassette contains a predetermined volume of liquid. If it is coupled to a drive mechanism in the pump, it pumps the liquid out of the pump at a predetermined speed. When the cassette chamber has been emptied at least partially by a predetermined amount as a result of the operation of the pump, the volumetric chamber of the cassette becomes rapid

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ί .2.

filled again, and the pumping process then continues with this alternating emptying and filling until the predetermined volume has been pumped.

The cassette is a .syringe cassette ("syringe type cassette") with a chamber and a piston,; whereby the piston stroke is controlled by the drive mechanism of the pump is controlled. A variety of alarm devices ensure the safety of the operation of the pump and provide indications that give the operator a diagnosis of the cause of the pump alarm. These alarm devices give an alarm when air is in the line, low battery level, line occlusion and end of infusion, etc.

The present invention relates to a volumetric infusion pump for intravenous administration of fluids to patients. The pump can of course also be used to pump others Liquids are used as intravenous to be administered, but will be used here using the example of such an intravenous one Administering a liquid to a patient will be described.

When administering fluids to patients intravenously, it is desirable to control the flow rate at which the fluid is being administered and also to precisely control the total amount administered. The most common method of administration calls for it the use of a conventional IV administration unit in which a bottle with the liquid to be administered is hung up

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and the administration of the liquid to the patient takes place passively under the influence of gravity.

h The liquid from the hanging bottle kaxin through Ij

flow through a drip chamber, the number of drops per | Minute allows a rough setting of the speed, with j "

I '' to whom the liquid is administered. The nurse must take the drip- j jj

speed as well as the liquid remaining in the bottle;

kcitsmenge often immediately check and Tropfge- \ '

Adjust the speed by hand or stop the administration when the patient draws the desired amount of liquid . "> Has been carried out. The frequent examination by a the nurse is;

Time consuming and manual adjustment of the administration time j. and the rate of administration using the drip chamber are not very accurate. J

To overcome the numerous difficulties encountered in administering IV fluids with one to be set by the nursing staff To overcome drip chamber, numerous pumps have been proposed in which a control of the administration of the liquid! takes place on the patient. ;

One type of pump uses electronic means to determine the rate of drip in a drip chamber and automatically adjust the drip speed according to the determined speed. This type of pump can also included a cam-like element that supports the IV tube massaged in order to have a forced pumping effect for the

7624077 17.0177

sufficient liquid to be reached.

Although this type of pump is an improvement over the usual! borrowed arrangement with the bottle hanging high and under gravity The amount of liquid administered is also subject to certain restrictions with regard to the pumping speed and the ; Pumping a controlled volume of the fluid to the patient; subject.

Another type of pump proposed is based on the omission. the suspended bottle and the use of a volumetric

■ Chamber that is filled with the liquid to be pumped. the

i entire chamber is emptied slowly, to any one of ϊ many different methods, with the emptying speed

! speed is controlled accordingly to also the administration of the j fluid to control the patient.

! This type of pump has several disadvantages, including the

: Standes that the standard IV bottle and its accessories are not

is used and / an expensive special chamber has to be filled with the liquid to be administered. If this is a disposable chamber, the expense of creating a relatively large special ^{chamber that is filled with the desired liquid is high compared to the normal ht IV bottles} cleaned and sterilized with each use. Should the infusion rate continue to be low, can

7624077 17.0177

It will be difficult to precisely set a slow infusion rate for the exit from a large chamber.

j
I.

; The present invention overcomes many of the difficulties! of the known methods of administering IV fluids and in particular provides for the pumping in of an IV fluid

i in the patient with precisely set predetermined throughput; set until a predetermined amount of liquid has been introduced. In this case, provides a number of safety devices da-ί for that the pumping process interrupted either one or: is slowed very low speed when certain ^one preset conditions occur.

For example, if there is air in the pipe, the .rumpe abi switched and cannot be restarted until

j this condition has been eliminated. If the battery charge is too I
ι

low, an alarm is given although the pump continues to run. If the battery charge drops to a value that drives the ι If the pump is no longer sufficient, the pump is switched off until the battery has either been charged or replaced has been or until you connect a charger to the battery to recharge both the battery and the pump drive to deliver the required electrical power.

If the IV line is blocked beyond the pump's ability to pump, a locking alarm is triggered and the pump is switched off until the cause of the alarm has been eliminated. Is after all the predetermined volume of liquid is supplied to the patient

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; yy, the end of infusion alarm is triggered and the pump speed lowered to a very small value until the caregiver turns off either the pump and the IV administration unit decreases or a fresh supply of the liquid is used and the pump is again set to a predetermined value for the patient sets the amount of liquid to be administered.

With the volumetric infusion pump of the present invention, the controlled pumping of a liquid is under A conventional IV administration unit can be used to dispense the liquid into a disposable volumetric cassette fills a suspended bottle with the liquid »

In particular, it is a Spritsgnkassette ("syring © = type-cassette ") with a chamber of predetermined volume and a plunger that is used to empty the chamber when connected to the pump and pumping the Controls liquid from the cassette at a predetermined speed. In particular, a stepper motor is used to Driving pistons at a controlled speed according to the number and frequency of pulses supplied to the motor will.

The volume of the chamber in the cassette is small in relation to the volume of liquid that the patient normally has the infusion is administered. For example, the cassette volume can be 5 cm ", whereas the patient with the infusion generally receives a large multiple of 5 cm - both

7624077 17.0177

for example 500 or 1000 car - so that the cassette is filled
and must be emptied at least partially a predetermined amount a plurality of times to deliver the required amount of fluid to the patient.

Since the cartridge is small in size, it can also be "cheap." so that a fresh, sterilized cassette can be used for each infusion and discarded when the infusion is complete.

The pump itself comes with the liquid during the infusion process never in contact and therefore does not have to be sterilized after each use. The only part of the? "Pump-cassette combination, which consequently comes into contact with the liquid is the inexpensive disposable cassette.

In general, the cassette is carried by positioning means on the pump so that the pendulum piston of the pump on one
Approach of the cartridge piston engages and the hose from the
Liquid bottle is connected to the inlet of the disposable volumetric cassette.

The output line of the disposable cartridge passes through one
Be careful for the presence of air in the pipe and is
then connected to the patient for the purpose of infusion. The pump has presettable scales on which the volume of liquid to be introduced and the throughput with which it is to be introduced are set.

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il I I I I Il I I *

-Q-

After the lines to and from the cassette have been vented so that there is only liquid in the lines from the bottle to the patient, the pump is switched on, to drive the piston of the cassette, which pumps liquid at the set flow rate until the set rate Liquid volume is reached.

! The cartridge is partially emptied during the administration of the liquid \ many times at least a vorbestimtite amount and refilled; During filling, the piston works at high speed in the opposite direction to the pumping operation. The time it takes to fill the cassette chamber is relatively short

at the same time the chamber is emptied.

j However, to ensure that the liquid is administered with the precisely adhered throughput, the time required is

j to refill the cartridge chamber is determined and the step

I ι

ι motor that drives the piston with additional pulses during j of the next displacement stroke applied to the by the ι Refilling the cartridge chamber to make up for lost time. >

So, as can be seen, the volumetric infusion pump uses; according to the present invention a cheap, sterilized \ cassette which can be discarded after each use and which has a volume chamber with precisely adjusted cross-sectional area, the overall a plurality of times before After introduction of the predetermined quantity of liquid into the patient

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fills and is at least partially emptied.

The throughput at which the liquid is introduced into the patient is, is precisely controlled using a stepping motor to drive the piston in the cartridge chamber, and the at Any loss of time when filling the cassette is reported.

ι were similar in that the stepper motor receives additional pulses Accuracy of the cross-sectional area of the chamber determines the accuracy of the liquid displacement, and inaccuracies of the Chamber volume are not included in the throughput.

The volumetric infusion pump of the present invention i has a large number of safety devices, as already mentioned above j. It is important that the pump has:

. i

specified volume and throughput works accurately; It is just as important, however, that the pump does not endanger the patient's health by attempting to supply fluid, so-; l when the flow of fluid to the patient is not uninterrupted.

For example, the volumetric infusion pump according to the present invention to a device that detects air present in the line to the patient. If it does, will immediately shut off the pump to ensure that air is not being forced into the patient. Empties

I ^:

^! For example, if the bottle is complete, air will eventually enter the line and be pumped to the patient.

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If this happens, the alarm is triggered and the pump is switched off, to prevent this air from entering the patient. Conditions other than an empty bottle can also be used cause air to enter the pipe. The IV line in the air detector cannot be arranged properly either. In In all these cases the pump is switched off and cannot be restarted until the fault has been resolved.

Furthermore, the pump has a battery alarm, which emits an alarm signal if the pump has an operating time of approximately one hour from the battery charge. Will the If the alarm is initially triggered, the pump does not switch off yet. However, if the pump is operated beyond the warning period, without plugging in the charger, the battery eventually discharges so far that there is no longer enough power available, to feed the pump, and this fact triggers an occlusion in addition to the battery alarm.

The battery alarm can be silenced by connecting the charger to the battery. Then after a short period the pump can be operated with the charger while it is charging the battery at the same time.

The pump also has an occlusion alarm given to the operator indicates that the IV line has pumpability the pump is clogged or the battery is dead. A major cause of this alarm can be that the patient lies down on the hose. The line can also, for example

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be squeezed at the edge of the bed, the filter clogged or the hose clamp on the bottle still closed being. To release the occlusion alarm, the cause of the alarm must be eliminated before the pump can be switched on again.

Furthermore, the pump according to the present invention has an end of infusion alarm which is designed so that the operator the volume to be introduced into the patient

can set, and which emits an alarm signal when this volume is reached.

In particular, the volume to be introduced can be printed on the front panel '

of the pump can be set using a counting scale. The pump !

automatically counts the volume introduced in subsets of;

1 cnr ^/ ab and places the remaining volume to be introduced on the ^l

Volume scale of the ι umpe is visible.:

If the pump has entered the entire preset liquid volume {, the scale shows KuIl and the infusion end

i alarm triggered. If this is the case, the device does not switch off, I. However, it reduces the flow rate from the pump to a very low value of 1 cm / hour, intended to be kept open. away. With this very low throughput, the venipuncture cannula is less likely to become clogged before a caregiver can take care of the Alert Care. To release this alarm, either the pump must be taken out of operation or a fresh volume of liquid must be supplied can be entered using the presetting scale. If required, another source of liquid must be connected.

7624077 I7.ca77

It will be appreciated, therefore, that the present invention provides a highly accurate volumetric infusion pump in which an in The volume of liquid to be given to the patient can be precisely dosed using standard IV administration with a hanging bottle can. The pump has a disposable, low volume volumetric cartridge that is discarded after each use will. The invention will now be described in more detail using an exemplary embodiment with reference to the drawings.

Fig. 1 shows, isometric, a front view of the volumetric Infusion pump according to the present invention;

Fig. 2 shows an exploded view of the Putnpenteils the cassette takes up, with a pendulum piston that on

hon a-oTrrvrvrval + · i.i-i τηΛ.

Figure 3 shows a disposable volumetric cassette for use with the pump according to the present invention in detail;

Fig. 4- shows the pump according to the present invention in one Rear view;

Figure 5 is a first view of an air detector detecting air in the flow line detected;

Figure 6 is a second view of the air detector;

Fig. 7 is a functional diagram of the control electronics for the volumetric infusion pump according to the present invention; and

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FIGS. 8 to 24 show the details of the circuitry of the control electronics for the volumetric infusion pump according to the present invention and particularly illustrate the details of the functional blocks of FIG.

Referring to Fig. 1, in an isometric view, a pump according to the present invention is mounted on a stand 10 using two clamps 12, 14 shown attached. Furthermore, the Stand a standard IV administration unit with a bottle 16 attached. Bottle 16 delivers liquid to pump j through line 20. However, a pump exerts an induced draft, ι why the bottle 16 is not necessarily higher than the pump, brings to be orderly. A terminal 22 controls the liquids nAnn

The volumetric infusion pump according to the present invention ' comprises a disposable volumetric cartridge 24 which;

; Receives liquid from the line 20 by this line 20 j being connected to the inlet port 26 of the cassette 24. '

The volumetric cassette 24 has a piston shaft 28, the end portion of which fits onto a Peridel piston 30 which is supported by the Pump protrudes forth and serves to drive the piston shaft 28 in the vertical direction to the flow of liquid in the and to steer from the cassette, further a pair of dowel pins 32 extend from the pump, and the cassette 2h- faces Openings 34 which snap onto the pins 32. A valve

7624077 17.93.77

A valve motor shaft 36 extends from the pump into the valve portion 38 of the cassette to control the inflow and outflow of the liquid in to control the and out of the cassette and consequently for an alternate filling and at least partial emptying of the Cassette during the introduction of the liquid into the Patient care.

The output flow of the cassette 24 is taken off at the outlet connection 40 and then via an extension tube 42 to the Patient led. The extension hose 42 is also arranged in an air detector 44, which detects the presence of air recorded in the line to the patient. The details of the air detector 44 and the cassette together with the control mechanism for the pump will be explained in detail below.

The volumetric infusion pump of the present invention shows; a variety of working mechanisms and alarm indicators on the front and back of the pump. V / ie shown for example in Fig. 1, provide several alarm display elements 46 to 52 the alarm display for certain alarm conditions. In particular, the alarm display element 46 is for the air alarm, the element 48 is the alarm display element for the battery alarm, element 50 is an alarm indicator for the shutter alarm and element 52 an alarm indicator for the end of the Infusion process.

Controlling the volume of liquid to be introduced and the speed at which it is introduced will be great

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preset by means of the setting scales 54, 56. In particular
The scale ^{mechanism is 5 ^ to} cLie scale for setting the volume to be introduced, the output display 'elements counting down with increasing liquid delivery. The j scale 56 determines the throughput that can be set before the _;

i liquid is introduced into the patient. !

The i'aster 58 is a rinsing button that can be used before inserting i

j fluid in the patient the air is removed from the lines j. The switch 60 is an off switch, the button 62 is the
Operating switch that controls the operation of the pump after |

the off switch has been placed in the "on" position. ,

As shown in Fig. 4, the back of the volumetric ^ ¹ infusion pump carries an audible alarm 64 and a switch 66, j

can be switched on and off with the acoustic alarm. On
the socket 68 can be taken from an output signal and used for remote reporting to a nurse or other staff that an
the pump has one of the alarm conditions.

For connecting a battery charger for the power supply
A battery socket 701 is used for the battery inserted in the pump
the lid 72 covers the storage portion of the pump, the
Battery charger contains, accessible from.

Figs. 2 and 5 show further details of the construction
that part of the pump which, together with the cassette 24
the movement of the piston shaft 28 of the cartridge and the operation

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1 <ι III

the valve mechanism 38 of the cassette causes the flow
the liquid through the cassette 24 from the inlet port 26 to
Outlet port 40 is controlled.

As indicated above, the openings 34 lay in the cassette 24
the dowel pins 32 in the pump to move the cassette into
to record their working position. The valve motor shaft 36 is
ί stored and controls in the valve structure 38 of the cassette

the position of the valve according to the work of the motor 74 ..

ι The valve 38 is a two-way valve that

the passage of liquid from the inlet port 26 into a

j volumetric chamber 76 allows this to be in a first position

j of valve 38 to fill. In a second position of the valve

! 38 is the liquid from the chamber 76 via the outlet

ι neck 40 pumped to the patient. As can be seen, causes

the change control by the motor to control the position ^!

j

^! of the shaft 36 the actuation of the valve mechanism 38 in such a way that j the cassette chamber 76 is alternately filled and the liquid I.

! is passed on to the patient. <

The actual filling and emptying of the chamber 76 takes place ^!

j speaking of the movement of a piston 78 in the chamber 76. The; Piston shaft 28 is located at the end of piston 78 and is with; coupled to the pendulum piston 30. The element 28 snaps onto the; Pendulum piston 30 opens when the cassette on the pump is brought into the working position. The movement of valve 38 _:

between the two positions is with the movement of the piston 78:

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coordinated in its two seals to facilitate the filling and ent- j

j emptying chamber 76 to reach. !

The floating piston 30 is comparable with a slide construction ^80: inhibited by a shaft 8? is driven. The shaft 82 is i

, in turn rotated by a stepper motor 84-. The shaft 82 moves the slide 80 by means of a screw and a:

; I.

: Worm nut 86 to give the pendulum piston 30 a precise movement:

: j

' granted. A disc 88 with a plurality of slots 90 j; is also coupled to the shaft, and two detectors 92, \ 94-, each consisting of a light source and a light detector, detect the rotation of the shaft 82 each time the slot passes over one of the detectors 92, 94-, the slotted disc 88 and the '■■ ; Detectors 92, 94- are used to detect a closure of the line, as it is communicated by the standstill of the motor 84-.

^: As from the I ¹ Ig. 2 and 3, when the motor 84 is driven by stepping pulses, the shaft 82 rotates and gives the slide 80 and the pendulum piston 30 a vertical movement. This in turn gives the piston 78 in the volumetric chamber 76 a vertical movement in order either in one position of the valve 38 and at a controlled slow speed of the piston 78 to pump out the liquid upward in the chamber 76, or in a second position of the valve 38 with it

', rapidly moving piston 78 draws liquid downward into chamber 76.

The alternating fast pulling and slow pumping of Fluid in and out of chamber 76 by movement of piston 78 provides precise control of the speed and the amount of fluid that is delivered to the patient until a predetermined amount has passed through the pump.

FIGS. 5 and 6 show in detail that shown in FIG Air detector 44. As can be seen in FIGS. 5 and 6, the air detector includes a channel 96 that is shown in FIG Hose 42 receives. A pair of light sources 98, 100 are positioned over channel 96 to direct light energy through tube 42 send. In particular, each light source sends a light beam from outside the hose through one to the inside opening of the Hose's tangential point. The light source 96 enables air in the duct to be detected in the rear half of the hose 42, the light source 100 detecting air in the front half of the hose 42.

A pair of detectors 102, 104 detect the presence or absence from light refracted by the liquid and tube. Because the tube's common refractive index is with The liquid is relatively constant, but differs considerably from that of the air-filled hose Air detectors 102, 104 output signals indicating the two states make distinguishable.

The volumetric infusion pump of the present invention

is generally treated by a nurse or other hospital person & l in the following manner. First, the scale 56 for the infusion rate suf "O" is set before the switch 60 is set to "On." The air alarm display element 46 is now energized and continues to illuminate until the tube 42 is inserted into the air detector 44 and the air is removed has been removed in the tube 42 from the system, the flush switch 58 is depressed and held in this position, at an angle of 45 to the to the slot at the end of the valve motor shaft ^36.. is left this is the position the one shown in Fig. 2 Valve motor shaft 36.

Now the volumetric cassette 24 is placed on the dowel pins' pushed and set, the valve 38 in "'slot at the end ι the valve motor shaft 36 blocked. The shaft 28 of the cassette I

The piston is then pushed over the pendulum piston 30 and snaps in its debit position. The extension hose 42 is i now inserted into the air detector 44 and attached to the outlet connection 40 of the cassette.

The IV administration unit with the tube 20 is now removed from the Bottle Io filled before putting the hose on the inlet port 26 of the cassette is set. The clamp 22 is released in the open position and the flushing switch 58 is pressed to activate the pump Let the flushing mode work until the cassette 24 and the extension 42 up to the tip of the venipuncture cannula are completely free of air at the end of the extension hose 42. to

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At this point the cannula can be inserted into the patient's vein to allow the liquid to be introduced from bottle 16 under the control of the pump of the present invention can be.

Now it sets the scale 56 for the infusion flow rate to the desired value (cmVStd.), Then the scale 54 for the volume to be administered to the patient to verabfolgende '■, liquid volume. The operating button 62 is then pressed, whereby the administration of the liquid to the patient begins.

j While the volumetric infusion pump is working according to the ; The present invention can cause a number of hazardous conditions j occur- and the pump is designed · that by the ι Control of the pump in accordance with such Gef 3nbedingungen the j the highest possible safety for the patient is guaranteed.

In order to achieve a quick elimination of the threat condition, the alarm circuits provide visual diagnosis of the cause of the alarm. If one of the dangerous conditions occurs, lights up a special indicator light assigned to it. If the switch 66 for the acoustic alarm is still switched on, the loudspeaker 64- also becomes an acoustic alarm submitted.

The special alarm conditions are air in the line, low battery level, line occlusion and end of infusion. The air alarm is triggered when the bottle 16 is completely

3/17/77

Wt- '

empties iiat or some other condition occurs, as a result air occurs on the outlet side of the cassette and would be pressed towards the patient, or if the tube 42 does not enter the air detector

44 is inserted. If this alarm condition occurs, the pump switches off and the indicator lamp 46 lights up. The pump lets do not start operating again until the alarm condition is cleared. After the air is removed from the pipe, one depresses the operation button 62 to restart the pump operation.

The battery alarm is triggered when there is approximately one hour of running time left for the pump from the battery charge J. The alarm also provides an alarm indication by means of lamp 48, but the pumps continue to run. Will the Puinpenbetrieb however more! continued over an hour to infect without the charger and recharge the battery, the battery will discharge to a \ point where not enough power is available more to the - to make work ^ ump. The locking alarm is triggered in this pail. ι The battery alarm can be silenced by turning off the charger ^! is connected to the battery !, the battery is briefly

for example two to three minutes - can be reloaded and then press the operating button 62. The pump is then powered by the charger fed while this is charging the battery.

The occlusion alarm is triggered when the IV lines are over the preset pumpability of the instrument is also closed or the battery is so discharged that it can no longer feed the pump. Other causes of the

7624077 I7.oa77

solving the locking alarm are, for example, that the hose lines clog the patient's tubing, do? r has been lying on it, or being squeezed against a bed rail or in some other way.

The filter contained in the IV unit can also become clogged or blocked the hose clamp 22 on the bottle 16 must be closed. In order to cancel the locking alarm, the individual must be present Alarm condition resolved and then the operating standard>? 62 must be pressed.

The end of infusion alarm is triggered when the predetermined Volume has been introduced into the patient. This alarm allows your operator to determine the volume of liquid to be introduced to discontinue; has this set volume been introduced, the alarm is triggered. One sets the scale 5 ^ for that to be introduced Volume to the desired value; while pumping in, the pump automatically counts those introduced into the patient Volume units and represents the remaining volume to be introduced on the scale 5 ^.

If the scale 5 ^ has reached the display "O", the scale indicates the Alarm status by activating the display element 5 ^ on and reduced then the further supply of the liquid to a very low value of 1 cm / hour; with this slight diffusion, clogging occurs the cannula prevents the caregiver from intervening. To reset the end of infusion alarm, dial 54 a new volume of liquid to be introduced is set and

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if necessary a new source of liquid - for example two-j

! se a new bottle 16 - to be connected. j

, The control of the operation of the pump for the administration of; Liquid to a patient according to the preset; Conditions is done by the electronics of the pump, which j

j

_s in the conventional way in the form of a printed circuit inside j

i half of the pump housing. ^;

A functional diagram of the pump electronics is given in Fig. 7j with the blocks A to D and AA to DD. In Fig. 8 j

i through 24 are the details of how to carry out each:

Functions required circuits specified. The blocks outlined in broken lines with the designations \ A to Z and AA to DD correspond to those in FIG
Function of each of the blocks in the figure? generally described < .

Block A is referred to as the speed control. The block
A receives the commands that determine the direction of rotation of the stepper motor
Determine Ö4, which drives the pendulum piston 30, which in turn
the piston 78 in the cassette 24 continues to contain the
Block A the functions of the flush control switch.

In block B there is a division by 96; compare the
Designation. The circuit in block B is used to count the motor feed pulses. After every 96 pulses, block B outputs

7624077 17.8 * 77 yrs

I I

- 24 -

a pulse to block G, the oinen control pulse for a preset counter generates the scale 54 for the to be introduced Contains volume of liquid; see Fig. 1. Block D represents the preset counter itself and is corresponding designated. As stated above, the preset switch contains a scale 54 on which the volume of liquid to be introduced is preset.

In the pump of the present invention, corresponding to 96, motor pulses one cubic centimeter of that to be delivered to the patient Liquid, so that every time the block B 96 pulses has • detected, the driver C the preset counter DD by one , Counting step down counts. The scale 54 also has display elements on that during the pump operation to introduce the; To count down fluid in the patient in zero direction to visually display the remaining volume to be introduced at any time.

If the presetting counter DD has reached the counting state zero, the normal working state of the pump is interrupted and opened switched to hold mode, in which the pump pumps liquid at a very low speed. The block DD continues a contact, the closing of which indicates that an infusion process has ended.

The function of block K is to indicate that the engine has stopped. The block K receives pulses from two standstill sensors that indicate when the motor 84 (Fig. 2) has been forced to a standstill

will. In particular, the pulses received from these sensors are used to generate a counter in block K. reset.

The excitation circuit for the stepper motor of block 0 supplies the stepper motor of block Z with stepping pulses. These pulses are also detected in the standstill detector circuit K while the motor 84 is running. As in the Pig. As shown in FIG. 2, the small disk 88 on the shaft of the ^: stepper motor 84 provides standstill pulses which a counter in the; Set detector circuit K to zero each time a slot, 90 passes one of the light detectors.

^; If the standstill detector K receives more motor stepping pulses

; than the counter can record, before a reset ellimjj than from the

Standstill detector arrives, the block K gives an output signal from, which indicates that the shaft 82 does not rotate and the motor consequently stands still, although the motor 84 stepping pulses are fed.

The block L contains the control logic for the stepper motor and provides output signals that determine whether the motor is clockwise or Should run counterclockwise. These signals are alternately given to driver circuit 0 for the stepper motor.

The block P contains the buffers for the error and sensor output circuit; with the block P the display

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elements such as LED displays on the front panel of the ¹ pump in Pig. 1 excited. In particular, are for the display element? 4-6 to 52 LED display elements are specified, and these give a visual alarm in the presence of dangerous conditions in the operation of the pump.

The display elements 46 \ xs 52 combined in block X are used by the display elements 46 \ xs 52 in block -j? combined LED drivers. The output signals of block P corresponding to the various alarm conditions are also given to the error and display control elements of block T which controls the pump area in accordance with an alarm condition. The block W contains the relay driver, which applies a call signal to the nurse call output 68 (Pig. 4).

The block D is an oscillator, in particular an oscillator, which supplies pulses with a frequency of 211.11 Hz to a pulse width control in block G. The output pulses of the Blocks G in turn control their three-decade throughput scaling circuit located in block I, which is controlled by the in block 88 located digital switches are controlled, which the scale 56 shown in Fig. for the flow rate (liquid throughput) form.

The setting values of these switches forming the scale 56 provide ensuring that stepping pulses at the desired frequency are fed to the motor so that the infusion fluid is delivered to the patient can be entered with the predetermined throughput.

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The block J contains a circuit with which the refill interval is compensated. It saves those during the replenishment
of the cassette chamber 76 by deflecting the piston 78 in the
opposite direction of incoming impulses. When the plunger then moves forward again to add infusion fluid,
Block J compensates for the loss of time by using the motor drive
those pulses are added that during ^the: had accumulated Nachfüllintervalls, so that the supply Rato
for the liquid by the periodic interruption of the \ pump operation for the purpose of filling the _{Kassettenkammor;} is not affected. ■

The block h provides an audible and LED timing circuit is: drive pulses and provides for the in FIG _s acoustics shown 4! Alarm flags una to üiinKeniassen of the display elements 46 to \ 52. The detector included in the block N for low battery 'charge initially switches a the display element 48; thereafter ^: runs for a predetermined period of time - for example one
Hour - the pump continues, although the indicator 48 is on
The battery power is low. Discharges the
Battery on a fumct where the pump is no longer powered
Can be, the device is switched off and the Versc :: Iußaiarir. display element 5> C in addition to the display element 48
excited.

Lter j ^ ock N thus records the state in which the charge level of the
-att-erie low but there is still enough power available,
UiT: to operate the pump, the display element 48 indicating the alarm

7624077 17.0177

and the pump continues to deliver infusion fluid to the patient. Then a second level is reached in ^! that the charge level of the battery is no longer sufficient to operate pump J; at this point the locking alarm is also triggered and the associated display element 50 is energized.

In block Q there is a circuit which ensures that when the device is switched on for the first time, similar circuits be brought into the required initial states. This block Q ensures that the pump cannot work, before the operating button has been pressed or other undesired operating states have been eliminated.

The forward-backward logic is located in block R. The output signal of block R determines the direction of rotation dt> ^ DC voltage motor 74 of Fig. 2 showing the valve 38 in the cassette actuated. The block R takes - ^ input signals from the engine control logic and the driver circuits of the block S. In particular, the block S contains a pair of position sensors that determine the position of the slide 80 is detected in the upper and lower positions.

If the circuit determines these positions, it reports that a reversal of the direction of rotation of the motor 84 and also a control of the Motor 84- required for valve switching in the cassette are. The position sensors are shown in FIG. 2; they are two light transmitters and -receiver I50, 152.

7824077 17.K77

The Bloc} «: U represents the light transmitter-receiver combinations, with which the presence of air in the feed lines is detected

; will. The structure of these sensors is shown in FIGS. 5 and 6, placed.

^; As stated above, the block T contains the error and display

; control and furthermore the coding networks that determine ■ which processes take place during an alarm state. Into the- ; In particular, the pump then either continues to run in holding mode or is completely shut down.

In addition, the pump also runs in the first stage Battery alarms continue. The pump also runs after the end of Tnf URI nnsvOPffaTlcroo -im TToI -hoVvo-t — r> -5 cV> uoi-hQTi n-i

there is an air, occlusion, or low battery alarm.

The block AA represents the charger for the battery and serves! to do this, the battery via the battery socket shown in Fig. 4-; to load. ;

8 to 24 show in detail the circuits of Blocks of FIG. 7 and also the interconnection of these blocks. In Figs. 8 to 24, the circuit parts which the Blocks correspond to FIG. 7, outlined in dashed lines and identified with the identification letters corresponding to FIG. 7.

The oscillator block D of Figure 8 includes a pair of inverters 200, 202. A variable resistor network with the resistor 204 and the potentiometer 206 is between a common connection of the inverter and a common connection of one Resistor 208 and a capacitor 210. The two inverters 200, 202 ensure that the voltage potential across the j

Capacitor 210 switches alternately so that the capacitor; is continuously reloaded.

Loading of the capacitor 210, for example, in a direction '■ on, the voltage at the input of the inverter 200 is dependent on; the charging direction of the capacitor 210 is positive or negative _; polt. Correspondingly, a positive or negative potential is also required at the output of the inverter 202, so that the polarity on the other side of the capacitor wants to reverse the direction of charge. Polarity of the capacitor is continuously recharging, whereby the oscillator D supplies a pulse-shaped output voltage. This output signal represents the reference signal ^: for the entire electronics of the pump and can have a frequency of 211, 11 Hz.

The pulse signal from the oscillator D can be used as an input signal for the pulse width control of the block G in i'ig. 10 used will. In particular, this pulse signal can be applied to a partial counter 212, which is a conventional one 4-stage 1: 8 Johnson divider, which is from the to the clock input applied positive pulses is advanced.

7624077 17.9177

Four of the clock outputs serve together with a switch 314
to generate an output signal with a desired

Pulse position used as indicated by the position of the pulses to the

four output connections corresponding to the position of switch j

I 214 are given. ί

The output signal of the partial counter goes to a j as a set signal

Buffer 216, another output signal of the partial counter

Lers 212, which has the pulse position shown, as a reset ι

pulse to latch 216. The difference between the ^;

Latch 216 set and reset inputs j

causes the buffer 216 corresponding to the position j

of switch 214 a pulse signal of variable pulse width:

can deliver. i

The partial counter 212 can be a conventional integrated one Act digital circuit - for example the type: CD 4022 from RCA. The buffer 216 can also be used in a conventional integrated digital circuit can be included, for example, in the CD 4043 type from RCA.

The partial counter 212 provides an output signal that once
assumes a certain pulse position within each cycle of eight input pulses and is used to set a buffer.

This buffer is reset once per cycle and is therefore an output signal to an inverter 218, whose
Frequency is equal to one eighth that of the input signal. This

7624077 17.8177

tt t, II III! * · I till

»* F ϊ t t

The signal serves as the input signal of the pulse width control G. The pulse width of the output signal depends on the position of the Switch 214- off. In particular, the will be set in individual cases Pulse width selected so that the stepper motor receives pulses of the appropriate width. This measure is necessary S because some stepper motors require longer pulse lengths ^ lLs

'others to ensure proper operation.

j An output from the pulse width control block G becomes

given to a block I shown in FIG
Contains scaling circuit. This circuit has three decades: counters 220, 222 and 224 for the units, tens and hundreds ι represent the throughput control for the pumped liquid. The setting of the throughput by the operator takes place with the digital switch 88 from the switches 56 on eggs; Front plate of the pump. In particular, the switch 56 has the switch parts 226, 228 and 250 for the units, tens and hundreds. Although the visual display to the operator is decimal, the switches provide BCD-coded input signals to the scaling circuit of the block

If the operator sets switches 226, 228 and 230 on; the desired throughput with which the infusion liquid is to be administered is controlled by the BGD-coded input signals! to the decade counters 220, 222 and 224 and the clock input signal)

the scaling circuit in such a way that it emits an output signal whose pulse repetition frequency corresponds to the setting of the switches ^ 226, 228 and 230.

7624077 17.03177

A variety of resistive groups 232, 234, and 236
are used to bias the BCD input signals to the scaling circuit as shown in block I. An input signal
to switches 226, 228 and 230 is supplied by an inverter 237, at the input of which there is an output signal. A plurality of NOR gates 238, 24-0 and 24-2 serve in conjunction with
a NAND gate 24-4- to ensure that the pump is only
can then be flushed when all switches 226, 228 and
230 have been set to ZERO with the setting dial 56.

The output signal of the decadic scaling circuit of block I consists of the motor drive pulses which are transmitted to the speed control circuit in block A (! Fig. 8) and the compensation; circuit in block J of Fig. 1? walk. In particular, the motor drive pulses that are sent to the compensation circuit of the
Blocks J are placed, also as an input signal to an AND gate 24-6, the other input of which receives a forward signal. As a result, AND gate 24-6 provides an output signal when the pump is not running forward.

The output signal of the AND gate 24-6 is sent to an ODEH gate
24-8, with the output of which a pair of counters 250, 252 is clocked. The counters can be a four-stage up / down counter with a clock input, a carry input, blocking inputs, an up / down counter input and an up / down input for the prefix function.

These counters also have a carry output signal.

\ The up / down counter can be a conventional design

j tion - for example an integrated digital circuit

!

For example, of the type OO 4029 from RGA. ^;

j I

■ The counters 250, 252 collect the pulses from the OR ^{gate when 1 is} the on signal from the pump "L" used as the prefix gate signal. The count.!? counts up when the up / down signal is "H" and counts down when the up / down signal is "L".

The up / down signal is the forward signal, and it can be seen that the forward signal is "H" to count up when the pump is filling and that the forward signal "L" is to count down when the pump is emptying the cassette. As a result, the counters 250, 252 store output pulses, when the pump fills the cassette, and these pulses are counted back down to zero when the pump fills the cassette empties.

The output signal of the counter is passed to a flip-flop 254 via a NAND stage 2p6. The NAND gate wants to ensure that the counter output signal only goes to the flip-flop 254 when the pump is pumping in the forward direction and a signal from the period timing block I ^v i is present.

The flip-flop 254 is controlled by the output of the pulse width control block G clocked so that the

7624077 17.0177

de opposite logic levels during the positive rise of the clock pulse from the pulse width control block G to the Output Q is transmitted.

The output of flip-flop 254 serves as an input signal I to counter 224-, so that the frequency of the output pulses for l · is switched to a higher value according to the clocking of flip-flops the stepping motor until all the pulses from the counters 25C, have been counted down 252nd

The output of flip-flop 254 is also used as an input used for an AND gate 258, which together with the forward signal a second input signal for the OR gate 24 8 represents: represents. The output signal of the OR gate 248 clocks the input of the counters 250, 252 and effects during the forward operation

j the pump counts down the accumulated pulses. '

The pulse rate signal which controls the stepping motor is given as an input signal to a NAND gate 260, which is shown in FIG . Block F is coming.

Air operating switch 62 is not operated in the correct order, An RC network 262 eliminates interference voltages and a buffer memory 264- is set. The latch 264 can the same design as already described above, and in particular one of the memory circuits on a

7624077 17.0a 77

integrated circuit of the type GD 4043 of the Pa. RCA. The V>

output signal of the buffer passes through an inverter 266, i to be applied to a NAND gate 268. The output signal

i of NAND gate 268 is one of the input signals to NAND-j

Link 260.

The set input of the buffer memory 264 is derived from the reset or Operation stop logic of block H controlled. In particular, the circuit of the block H has a NAND gate 270, the three inputs linked, which correspond to the states that determine whether the buffer memory 264 in block F should be set.

! The AusfranKSignal of the NAND gate 260 goes to a second ^: NAND gate 272; the output signal of the NAND equation 272 is öas! Control signal for the motor. The NAND element 272 delivers the: Motor control signal corresponding to the puncture of the speed

keitssteuerblocks A, the puncture will be described below.

The output of the NAND gate 272 is also applied to the divider ch-96 block the Pig. 9 given. The circuit of block B has a pair of divider stages 274, 276. The first divisor 274 divides by 6, the second divisor 276 divides by 16. Both divisors together divide by 96, and in the pump according to the present one According to the invention, 96 motor control pulses correspond to a delivery of 1 cnr of the infusion liquid.

7624077 17.0177

The divider 274- can also be made using the appropriate output signal a divisor-by-8. For example, the divider 274- can be a four-stage 1: 8 Johnson counter of the type described above in the implementation of an integrated circuit CD 4022 of the Pa. RGA act. at the input CE is a clock opening input, the strobe signal being supplied by a NAND gate 278.

The inputs to NAND gate 278 are the forward signal and the load signal, which represent the state that the pump operates in the forward direction and the cartridge does not load.

The output signals of the divider 274- go as set and reset pulses to an intermediate counter 280, which is also one of the conventional designs described above can act. The buffer 280 is alternately set from 0 and corresponding to the count of the divider 274- to 6 is reset, the buffer 280 clearing and resetting the divider 274- after each count of 6 clock pulses caused.

In particular, the output of the latch 280 is applied to a NAND gate via an inverter 282, so that the divider 274- a Reset signal is delivered when the NAITO-GIied the In— Rück = Setζsignal and receives the output signal of the inverter 282.

7624077 17.0177

One of the output signals of the divider 274- is sent as a clock signal to the divider 276, and the divider k? 6 receives one pulse for every six pulses received by the divider 274-. The divider 276 can be a binary counter of the type described above - for example a type CD 4029 from RCA. The carry signal of the divider 276 is used as the output signal and occurs once for every sixteen input pulses of the divider ^ 76. The ₍ output signal of divider 276 goes to block C, ie the driver for the preset counter in block DD. '

The output of the divider-by-96 in block B goes through a capacitor 286 and a resistor 290 differentiated on an inverter 288. The resistor 290 continues to operate a correct presetting setting for the inverter 288. That The output signal of the inverter 288 is passed through a ** n resistor 292 given to the base of a driver transistor 29 * +, while a Diode 296 the inductive voltage peak at the collector of the Transistor 294- depressed.

The output signal of the transistor 294- goes to the preset ell- i counter DD with the scale 54- shown in block DD for presetting the infusion volume to be administered. The counter is set by the operator on the front panel of the pump by setting the buttons on the scale 54- to the total number of cubic centimeters of the infusion fluid to be administered to the patient placed.

Every time the divider-by-96 of block B has 96 motor pulses! has counted, the preset counter is one step down

3!

switched, which means that the patient has 1 cm of infusion |

fluid was administered; at the same time the ι is reduced

Scale display by one partial step. If the counter reaches the | stood toull, a switch 298 closes and supplies an output |

i signal of the counter block DD.

Fig. & Now represents the speed control of block A-. This circuit provides signals that ultimately determine the speed at which the motor is operated. At- ^!

For example, during the flushing operation of the engine, the engine is; driven quickly both back and forth to the cassette to fill quickly and then quickly pump the filling out of the cassette j in order to evacuate the lines.

During normal jr-umpening operation, the motor is selected with Forward speed to infusion fluid according to the setting of switches 226, 228 and 230, which are part of the 56 * scale, to be administered.

The motor control pulses with the required speed represent one of the three LIn ₁ angssignals of the NAND element 260. The other input signals of the i-iAND element 260 are a signal that represents the motor function in the forward direction, and the output signal of the start / operation Buffer block F, which represents the function of the operating switch 62. The initial

7624077 17.0177

t · tt ta suffered

I »· * t t I

t * »1 y

β I * 1 » * I

- 40 -

signal of the NAND gate 260 goes to the NAND gate 2? 2, whose The output signal in turn represents the motor control signal for normal pump operation.

The flush switch 58 "is normally in the open position, unless it is closed by pressing, - so that it is in the flushing or loading position. Is the

'Switch 58 is in the flushing position, this fact causes a

Input signal for a NAND element 300, whose further input; signals from the NAND gates 302 and 304 come.

The NAND gate 304 is controlled by the signals loading and loading, since a first input to NAND gate 304 is the Load signal after passing through inverter 306 is. The

: Second input to NAND gate 304 is the output ι a buffer 308 after passing through an inverter

The set input to latch 308 is the load;

Signal. This circuit part ensures that the flushing signal j

the NAND gate 300 cannot pass when the pump is on;

I is not in charging mode. A forward stop signal \ illustrating the state that the motor is to run backward to '■ to fill the cartridge, is used to reset the latch ^ 308th A pair of resistors 312 and 314 are connected to one ^! Supply voltage applied to bias the flush and load signals. j

7624077 17.0177

The output of the NAND gate 300 is used as a data input
is used for flip-flop 316, and this flip-flop can be
be in an integrated circuit with two conventional flip-flops ^-..!. "For example, the GD type 4013 from the company RGA The level '<this signal, the data input is transferred during the positive presence Stieg the clock signal on the output Q A clock I

j

; input signal to flip-flop 316 is from output Q an i; second, corresponding flip-flops 318 derived. The flip-flop \

: j

318 is in turn determined by the oscillator in block D!

holding reference signal controlled. The signal at output Q of the
, Flip-flops 316 is an input signal of a NAND gate 320,
\ whose other input signal is the Q signal of flip-flop 318

; is. The output signal of the NAND gate 320 serves as the second
'Input signal to NAND gate 372 and causes the display
; of the motor control signal from the NAND gate 272.

: The motor control signal from block M is used as an input signal
to block L of FIG. 11, which is the control logic
for the stepper motor. In particular, the motor control signal is sent as a clock signal to a pair of flip-flops 322, 324
given, which can be data lip-flops
those of the level of the signal at the data input on the positive
Edge of the clock pulse is transferred to the exit Q. Both flip-flops 322 and 324 can be integrated in an integrated digital switch

^: device such as the type CD 4013 from RGA.

7624077 17.0177

j The forward and forward signals appear as input signals, j the AND gates 326, 328, whose output signals are sent to an OR gate 330 go. The AND gates 326, 328 together with '

! the OR gate 330 an AND / OR selection gate, and the three ver, links can be part of an integrated,. Digital circuit '

such as "for example of the type CD 4-019 from RCA. " ·

The output of FLJpflop 324-, denoted as N and N are, also go as an input signal to the AND gates 326, 328. The input signal of the flip-flop 322 thus represents the forward or Represents the forward state for the motor drive.

Furthermore, the forward and forward signals are paired AND gates 332, 33 ^ given, the output signals of which on a OR gate 336 go. The AND gate 332, 334 and the OR gate ed 336 form an AND / OR selection circuit similar to that discussed above is identical and can also be part of an integrated digital circuit, for example of the CD 4-019 type from RCA.

The other inputs of the AND gates 332, 334- are the output signals of flip-flop 332, labeled M and M.

The four output signals M, Fi, N and F are used as input signals of driver block 0 is used for the stepping motor of FIG and in particular used to drive the stepper motor 84- in the correct direction and with the required To induce speed.

7624077 17.0177

As can be seen in FIG. 15, the signals go in driver block C K, IT, fr and K to the inputs of a large number of NAND gates 338 to 344. The four NAND elements 338 to 344 can all be part of an integrated circuit such as the CD 4011 of the RCA company. The other input signal of the NAND gate 338 to 344- is an output signal from the block E of FIG. 12, whose circuit - an overdrive detected.

The output signals of the NAND gates 338 to 344 go over Inverter 3 ^ 6 to 332 to a plurality of transistors 35 ^ - to 360, the output signals of which are applied to the stepper motor as a multitude of input signals in order to move it in certain directions and to control it with certain speed texts, as prescribed by the input signals. The stepper motor can Conventionally designed and, for example, a type R 86201 from Hayden Mfg. Corp. being.

The circuit in block E which detects an overdrive receives input signals which represent the delivery rate for the infusion liquid according to the presetting of the scale 56 on the front plate of the pump. In particular, the input signals are taken from the binary-coded counters 220, 222 and d-έ ¹ + and represent the most important ones digit, all tens and two hundred digits.

So there are a total of seven £ input signals that start with a multitude of seven diodes, collectively referred to as 380, and a multitude of seven resistors, which are

7624077 17.DS.77

are collectively referred to as 382, can be summed. An output signal is generated, the voltage value of which corresponds to the throughput, to which the operator has preset the pump. The output signal of the summing network is via a biased RO circuit 382 and through an inverter 386 given the transistor 360 in block O of FIG.

The motor control signal from block A is generated via a diode and an RC circuit 380 made up of two resistors and a capacitor given to an inverter 392, the output signal through a resistor 39 ^ for the purpose of summing with the electrical Input signal from the scale 56 runs. Two diodes 396, 398 ! couple the motor control signal from the input information j of scale 56.

The motor control signal is also applied to a NAND element 402 via an inverter 400, the second input signal of which is the

Full on - signal is on. The output signal of the NAND element 402, I, which represents the motor control signal, is still used as an input

! output signal for the NAND gates 338 to 3 ^ in block 0 given.

The signal of the NAND gate 402 continues to run through the diode! 398 to the summing point. As long as the motor control pulses do not change are a certain amount above the set throughput, j the output signal of the inverter 386 does not represent an overdrive state represent.

7824077 17.0177

The block K shown in Fig. 11 is the circuit for detecting an engine standstill and enables a comparison of the j Frequency of the hotoransteuerimpulse with the actual speed of the stepping motor 84 ·. In particular, the ones shown in FIGS. and 21 two standstill sensors 92 and 94 input signals across resistors 404-, 406 to the NAND gates 408, 410.

^: The output signal of the NAND gates 408, 410, as it is applied to a NAND gate 412, and the output signal of the NAND

: Link 412 corresponds to the speed with which the Hotor drives the pump. The output of the NAND gate 412

j is applied to a flip-flop 414 and serves as its clock

j pulse. In the case of the Flipxlop 414 karin see an implementation act as already described above - for example! a type CP 4013 from RGA. The outputs Q and Q of the . Flip-flops 414 go as second input signals to the j NAND gates 408 and 410. The output Q of flip-flop 414 is used furthermore as a data output signal for the same flip-flop.

The output signal of the NAND element 412 is also given to a NAND element 415 via a capacitor 418. The second input signal of the NAND gate 416 comes from the block R shown in FIG. 1, ie the forward-backward logic. The output signal of the NAND gate 416 is given as a reset signal to a divider 420 which aucu. receives ^{the i v} iotoransteuerimpulse as a clock signal. The divider 420 can be a five-stage Johnson decade counter that acts as a comparator

7824077 17. » η

is used between the reset and the clock input. In particular, it can be an integrated digital circuit of the
Type CD 4017 from Pa. Act EGA.

The motor drive pulse signal used as the clock input pulse for the divider 420 causes it to occur with every positive one
Clock edge of the motor control pulse to change the count status if the clock signal input is "L". As can be seen, one of the counter outputs is connected to the counter as a Taictauftastimpuls. If the counter continues to count up to the value determined by the counter output, the clock strobe signal goes to "H" to indicate that the motor has stopped. However, if the output signal of the NAND gate 416 occurs periodically and
resets the counter 420, the output of the
Counter 420 never becomes "H" and thus indicates that the motor is not> ß
rotates perfectly and does not stand still.

The block K is essentially an electromechanical comparator, since the signals from the standstill sensors are related to the actual movement of the shaft of the motor 84, as shown by
the standstill sensors is detected, these mechanical
Movement is compared with the electrical pulse signal used to control the hotors 84. Lias output signal of the
Counter 420 serves as an input signal for a buffer in the error and sensor output block P of FIG. 18.

The block P of Fig. 18, which is the buffer for the error and sensor output signals,

7824071 17.ΛΤ »

accepts a variety of input signals corresponding to the various Represent error states. The block P has four Cache 4-22, 4-24-, 426 and 428, all of which are part

a single digital integrated circuit as one type I.

4-043 from RCA.

The latch 422 takes the output signal as its input of the air sensors from the light transmitters 98 and 100 and the light receivers 102, 104 in block U of FIG. 21 and the j Figs. 5 and 6 are formed. The light transmitters receive operating current from a positive voltage source via a resistor ι 430. The output signals of the light receivers 102, 104 are in Series connected to one another via a resistor 432 on the buffer 422.

Executed Yfie above, the output signal of the memory intermediate 'is derived 424 from the block K + circuit with the engine stall detecting and represents a signal which corresponds to the stoppage of the hotors - usually a state in which the flow conduit is closed. The input signal of the block K comes from the standstill sensors 92, 94, which deliver parallel output signals. The light transmitter part of the standstill sensors takes the operating power from a positive voltage source via a resistor 434.

The latch 426 accepts an input signal from the block contained in the I DD Voreinstellzahler that t the end of the Infu- indicating sion process. In particular, switch 298 closes in J.

7624077 1710177 i

9, when the counter 54 has reached zero. to at this point the output of the counter is 5 ^ - over a resistor 436 is applied to the latch 426.

Finally, the latch 428 receives an input signal which comes from the detector block N of the Ifig * 18 and which indicates a low battery charge level. The block N represents; fixed [ when the voltage of the battery is below a predetermined value

falls off. In particular, the battery voltage is applied via a ' voltage divider with a resistor 438 and a potentiometer ι 440 and a Zener diode 442 parallel to the potentiometer

[ The output voltage of the potentiometer 440 at its tap serves as an adjustable threshold value and goes via an inverter 444 and a resistor 446 as an input signal to a second inverter 448. Furthermore, there is a capacitor between the battery voltage and the input to the inverter 448. The output signal of the inverter 448 is a signal corresponding to the voltage value of the battery. If this falls below a certain value, as determined by the position of the tap on the potentiometer 440, the charge level detector of block N emits a signal that controls the buffer 428 of block P.

The output signal of the buffer store 422 to 428 in block P goes to the error and display control part T of FIGS. 18, 19. The circuit of the block T includes a plurality of inverters 452 to 452 458, the output signals to the relay driver block W the

7624077 I7.oa77

Pig. 19 for the nurse call. The one in Pig. 19 part shown of the block T furthermore has a logic circuit which supplies output signals which indicate the end of the output of a predetermined the th plus quantity and then the submission of a j Check the minimum delivery of the liquid. !

Im in Pig. 18 shown part of the block T, the output signal of the inserter 4-52 to 4-58 on a variety of inverters 4-60 to ι

i given 4-66. The output signals of these inverters feed the I.

Light-emitting diodes (LED's) 4-6, 4-8, 50 and 52, which represent the display elements> ; on the front of the pump and as block X in the j : Pig. 18 are designated. :

ι; The actual raising of the LEDs 4-6 to 52 and the LED 62 for ' ι the status display, all of which are summarized in block X,

i!

; takes place from the timing block, h and the LED-Treibei ^l ~ Block V, 'I both in the Pig. 17 are shown. In particular, in the circuit of block M, a high-speed pulse signal is applied to a divider 4-68, and this number of pulses can be supplied by the divider 224- from that in block I as the first throughput level signal.

The divider can, for example, be a four-stage 1: 8 Johnson divider his, for example, in de r integrated circuit GD 4-0 ^ 2 of the Pa. RCA is present. Certain output signals of the Divider 4-68 are used so that the pulse signal given to the divider is counted down and the output signals to the NOR members 4-70 and 4-72 are placed. For example, this takes

7624077 17.0177

The NOR element 472 has signals which correspond to the output ¹¹ O "and the output 4, the NOR element 470 input signals which represent the output 0 <j, the output 2 and the output 5. The output signals of the NOR elements 470 , 472 are therefore pulse signals with a lower frequency than the input signals of the divider 468.

The output signal of the NOR element 472 is fed through a resistor, stood 474 given to a transistor 476, the de-a block V forms. The transistor 476 provides a Viechseipotential to Control of the light-emitting diodes arranged in block X and to excite a horn 64 when the switch 66 is in the closed position is located (see. Fig. 19).

The output of NOR gate 470 goes as an input to a NOR gate 478, the other input signal of which is the input signal going to the divider 468. The output signal of NOR gate 478 is applied to NAND gate 256 in block J as an input. The ones shown in block X Light-emitting diodes flash or the horn sounds with a frequency that corresponds to the pulse frequency de ", output signal of transistor 476 in block V corresponds.

The block W in Fig. 19, the relay three stages for the nurse call, takes input signals for all alarm conditions from the plock T, which go to a NOR gate 480 and an inverter 482. In particular, only the error signal goes for the low one Battery charge status to inverter 482, all other fault status

7624077 3/17/77

signals to the NOR gate 480. The output signals of the NOR gate 480 and the inverter 482 go to a NAND gate 484. How As can be seen, deliver - apart from the battery charge level signal - the other error status signals linked via the NOR element 480 an error signal which is used as an input signal to the NAND gate 270 in the reset and stop logic of the block H in of Fig. 8 is.

As a result, if an error condition occurs, the pump is stopped .; If the low battery charge is left for a sufficient length of time, without recharging the battery, there is no longer enough power available to drive the pump; this state; j leads to a standstill of the motor 84, which the standstill | sensors detect so that the NOR gate 480 emits a signal, I uEAfcs uen xtucktseLü — ουυρ — Logicuj-Ock η so oiled that uxe » The pump is switched off if the power supply is not mshr | sufficient. |

The output of the NAND gate 484 is applied in parallel to a pair of inverters 486, 488 to a nurse call relay 490 and to control an atiustiscne warning device 84. The relay 490 receive operating current from a source of positive voltage a diode

The acoustic alerting device 64 is connected to the block W via a Resistor 494 and a diode 496 connected. If one of the remote conditions occurs, the care call relay 490 is energized, the applies an output to the nurse call jack 68. Is the

7624077 17.0177

If switch 66 is closed, an acoustic signal sounds in addition to the lighting up of the corresponding light-emitting diode in block X. j

As shown in the part of block T contained in i "ig. 19, the alarm signals and especially the end of infusion, air and the shutter signal are used to generate an end-of-discharge signal and a minimum-discharge signal. In particular When the infusion is complete, a signal is given to a NOR gate 489, which is an output signal via an inverter 500 to a NAND gate 502 gives. The output of inverter 500 is the end of infusion signal.

The two if error signals, which report air in the line and line closure, go to a NOR element 504, which also has a ■ -c,. — __ ._____ n .o _._.-.._ 7- ·· μ -_- ι-; ; _,? - £ ϋ ₀ ΓοΓΐ. »As the output signal

, of NAND gate 502 is the minimum output signal. So as can be seen will be after the completed delivery of the predetermined

! Plüssigkeist amount the pump to a very low displacement

'switched by, for example, 1 cvar . This minimum fee is always; but not desirable, unless no air in the ^line: there are still a line closure.

The light-emitting diodes on the front panel of the pump are ■ Block X has a light emitting diode which generates light in the operating button 62 when the pump is working. As shown in Fig. 20, an on-signal is inverted to the on-signal via an inverter 506. In addition, the output signal of the inverter goes through a further inverter 508 and a resistor 510

7624077 I7.oa77

to provide a signal indicating the function of the button 62 assigned Part of the display unit in block X controls.

The block R of FIG. 22, which is the forward: reverse logic acts, determines the direction of rotation of the DC voltage motor 74 »which actuates the valve control element 36, as in FIG Pig. 2 shown. Element 36 controls the operation of valve 38 of cassette 24 of Fig. 3. A pair of light detectors 50, 6, 508 forms block Y of FIG. 18, and detectors 506 are also shown in FIG. The detectors 506, 508 provide Output signals that correspond to the holding position of the valve in the forward and reverse directions. An operating voltage supply is connected to a resistor 510, around the light transmitting part of the light detectors 506, 50Ö

A disk 512 with a slot 514-1 as in FIG. 2 shown can be used together with the light detectors 506, 508 to provide output signals corresponding to the positions of valve 38.

The signals from the light detectors 50t ·, 5C8 and their complement signals as well as other signals developed in system electronics (Figs. 8 through 24) are used as the various inputs to the forward / reverse logic block R. In particular the backward and forward signals are given to a NOR element 5I6, whose output signal controls a flip-flop 3I6 that Is part of block A in fig. The output signal of the NOR

7624077 3/17/77

GJiedes 516 goes through an inverter 518 to an NCR gate 520 and also to a NAND gate 416 in block K, in which it is about the motor standstill detection.

The reverse s signal and the forward signal serve as input signals for a NOR gate 522, the output signal of which is the reset represents zsignal for a buffer 524.

The reverse stop signal is passed through an inverter 526 to a NAND gate 528, the thrust forward signal also to the NAND gate 528. Signal is. The output signal of the buffer 530 runs through an inverter 532, which Λ ο ο "ΙΓ / - \ - τ> ΐ.ι QTi-f er> ο -in» rin "l * ί * -» · ΐτ- »/ 3 r \ -r \ ΛΤ γ \ ττ \ Α -ι ~ i γί "» η + · -η -ΐ * 3V \ Ω τ »Γ7 Ci Π CT ~ \ ~ · ril ooQG C2 TO ¹ VIqT

runs through another inverter 53 ^ and becomes the reverse signal for the valve drive.

Furthermore, the output signal of the inverter 534- goes to Input of the NAND gate 536. The output signal of the inverter 532 goes directly to a KAND gate 538. The on-reset signal is the second input signal of the NAND elements 536 and 538. The output signal of the NAND element 536 serves as a reset signal for the buffer 524. The output signal of the Latch 524 goes through a pair of inverters 540 and and becomes a reverse signal.

7S24Q77 3/17/77

The forward signal for the valve and the clock signal of the flip

j flops 254 in block J go as -input signal to the NAND-

Element 544 · A resistor 546 applies the positive operating voltage to the same input of the NAND gate 544 as the forward stop signal. The output signal of the NAND gate 5 ^ represents the input signals together with the reverse signal from the inverter 5 ^ 2 to the NOR element 5 ^ 8, the output signal of which is the Reset signal for a latch 550 is its Set signal from NAND gate 558 received. The output signal of the Buffer 550 goes through an inverter 552, becomes

j forward signal as well as a further inverter 5 ^ ₅ of the

Provides forward signal.

The block S of Fig. 24 represents the engine control logic and the; Control circuit for the DC voltage motor 74- which actuates the valve $ b in the cassette. The valve forward signal and the valve reverse signal from block R in FIG. 22 \ go to NAND gates 556, 558, the other input signals of which come from NOR gate 520 in block R.

The output signal of the NAND gate 556 is closer to the NAND gate 560 and also connected to the base of transistor 568 via two inverters 562, 564 and a resistor 556. The The output of the NAND gate 550 serves as the second input signal of the NAND gate 560 and goes through two inverters

j 570, 572 and a resistor 57 ^ on the base of a transistor

576. The collectors of transistors 568 and 576 are across the Diodes 578, 580 connected to ground; the output signals via the

7624077 17.0177

- - - qn \

Diodes 578 and 580 are the control signals for the DC motor 74.

The output signal of the NAND gate 560 goes through a capacitor 582 and a parallel circuit 584 of a resistor with a diode to two inverters 586, 588 connected in parallel The output voltage of the inverters 586 and 588 is used for excitation an electromagnet 590, the contact 592 of which ensures dynamic braking control of the DC motor. Over the winding of the electromagnet is a diode 594. Furthermore two transistors 596, 598 control the DC voltage motor 74 and in particular its direction of rotation. The rotation of the motor 72 controls the position of valve 38 in cassette 24.

The collectors of the transistors 596 and 598 are connected to a positive voltage source via the diode 600, 602. The base of the transistor 598 is connected to the collector of the transistor 596 via a resistor 604, the base of the transistor 596 via a resistor 606 to the collector of the transistor 598. If the transistor 568 turns on when a valve drive signal is applied in a first seal, the transistor also turns on 598 ^: through to complete the current flow path, while the transistor 596 blocks.

The opposite situation occurs when transistor 576 at j

ι switches a valve drive signal in a second direction transit \. The electromagnet 590 is used to drive the DC motor; 74 to brake dynamically. ;

The forward and reverse stop light detectors I50, 152 provide the \ forward and reverse stop signals in the block R of the Pig. 22, these light detectors are also designated as a second part of block R of FIG. Resistor 608 is used to provide operating power to the light emitter portion of light detectors 150 * 152. The output signals of the light detectors 150, 152 are parallel to a pair of resistors; stands 610, 612 (S ¹ Ig. 14), which are connected to a positive voltage source. The signal across resistor 610 is running _; by two NAND gates 614, 616 and then sets the forward | stop signal. i

j

ι To be in different parts of the system of FIGS. 8 to 24 be-j

i

:. To produce forced on reset signal shown in FIG 23 ge-j showed block serves Q. The output signal of the operating switch is' ■ as one input to a NOR gate 618, which his second: input signal through a resistor 620 and receives an inverter 622 \ from a positive voltage source. The output signal of the inverter 622 is taken from a parallel circuit 624 consisting of a resistor and a capacitor.

The output of the inverter 62c! is made by a parallel connection 624 taken from a resistor and a capacitor. The output of inverter 622 is the on-reset signal, and the output signal corresponding to the on-reset signal serves as the input of the inverter 622. The output of the NOR gate 618 is an on-reset signal, the ι is inverted by an inverter 6262 to the on-reset signal.

ι This on-reset signal is the reset signal for the

Temporary storage in block P.

: The Pig's 628 battery charger. 13 (block AA) is via a Line plug connected to the mains voltage. It can the charger is a conventional design, the output voltage of which is connected to the connector 71 on the back of the pump is connected to supply charge current to the battery 630. The battery 630 provides the main source of energy for the pump A fuse 632 secures the loading process, and with the Switch 60 on the front panel of the pump is used to apply battery supply voltage to the various circuits controlled by the pump.

In general, the following applies to the work of the pump that for start-up 2: the same first the operating circuit with the switch 60 in block AA, which is the on-off circuit for the battery charger. When the supply voltage is switched on the block Q supplies the signals, rafc them all Circuits within the pump are reset so that the pump is ready to load the cassette 24.

If a cassette 2-4- is loaded, all switches 226 and 230 of the reset dial 56 are set to zero. This zero state causes an output signal of the NAND ^{gate 244, the B} input signals of which are the output signals of the NOR gates 238, 240

and 242 are.

7624077 ir.0177

The output signal of the NAND gate 24-4 is used to switch the flushing switch ^ b ready for operation, so that no pump operation can be caused by this without the output signal of the NAND gate 24-4 being present.

The control circuit of block A controls the motor control logic of block L, which supplies output signals that the motor ' 84- command the right direction and speed. These output signals of the block L go to the driver block 0 for the stepper motor and then on to block Z, i.e. the stepper motor ο4- itself.

h ach rinsing, ie, air clearing the lines to the pump and to the patient, the operator on the scale ^ & in Liuuk oo the gewunscn-ce xniusxonsra "ue (zext; xxcner rcengendurchs ^ tz). A scaling circuit in block I provides output pulses corresponding to of the desired infusions, whereby the scaling device is controlled by the oscillator shown in block D and via the pulse width control of block G.

Iisboscnaere are the input pulses of the scaling circuit of the ixocks 1 aow ^ rts counted. Depending on the 58 Una in particular the switches 226, 228 and 230 specified i uiiKOen W'-ifiit the control circuit decoding points to to generate impulses, each one impulse to a volume of 1 / ^ 6 of a cubic centimeter, where the Frequency of these impulses of the desired infusion rate is equivalent to.

17.§a77

The preset counter 5 ^ i ^m Block DD is also set to the gswünschte introduced total liquid volume. ;

At this point the piston is propelled up in the cassette, to supply infusion fluid to the patient, the light sensors shown in block R being the top and bottom Record the position of the piston., - ^ ie forward and reverse stop points are ultimately specified by block A in order to decode the drive direction for the motor. The one used to drive the The pulses used in motor 84 are also derived from the 1:96 divisor of the Blocks 9 captured. After every 96 pulses, a pulse is sent to the driver for the preset counter block B; this impulse counts down the presetting counter DD by one step.

! Has the default counter 54 in block DD the counter reading zero

is enough, the patient's desired amount of fluid is full. ; been administered continuously. However, the pump will not complete stopped, but pumps in holding mode with one

^; 7th

; Throughput of 1 cnr / hour further.

The motor standstill circuit of block K also picks up the motor control pulses, as do the pulses for the actual rotation _; correspond to the motor shaft in order to detect a blockage of the flow line or a motor standstill. If one of these faults occurs, the pump is switched off. In particular, the disk on the stepper motor has a coding disk with six slots, so that the number of pulses required to turn the motor upstream by a sixth of a turn is matched by the actual rotation of the coding disk as determined by the standstill sensors

95 \

92, 94 is compared.

If the motor stops or if a line blockage occurs so that the motor can no longer operate the pump, the , Block K more hotoransteuerimpulse than necessary before the next slot is detected. Then the pump is switched off and the locking alarm is triggered.

Among the other alarm conditions is that of an air embolism: in which the presence of air in the line is detected by the pump switched off and the warning device is triggered. In addition, the battery charge level and the end of the infu

! is monitored in the manner described above. ' j!

The compensation circuit for an out-of-the-way line cveriust in uIock j . compensates for the loss of accuracy caused by the interval in which the piston returns to the down position is guided to fill the cassette 24. In general, be j wears this interval five express; at higher infusion rates j this period of time can result in a significant loss of momentum for the; Motor drive mean the accuracy of the infusion rate impaired.

The circuit shown in block J takes the motor drive pulses that occur during the filling interval, and outputs them then slowly return to the Kotor together with the normal control impulses. So then for a short period of time is the infusion rate slightly higher than that of the scaling circuit in the

Block I prescribed. The circuit arrangement of the block J thus causes a slow addition of additional liquid over a period of time that compensates for the loss of accuracy due to the refill interval for the cartridge.

The forward-reverse logic block R generates signals which command the forward-reverse control of the motor 7 ^ which actuates the valve 38 ' in the cassette 24-. This valve must be during the

i Infusion of a liquid into the patient in a first | Position, and after the \ piston has cleared the cartridge, are during refilling of the cartridge, in a second position.

The various circuits that make up the blocks in Fig. '/ have now been described in retail with reference to FIGS. 8 to 24. Additionally, it will be noted that many of the gates, flip-flops, counters and the like are in addition to the above show further markings described. In particular, acts it is the reference numerals beginning with the capital letter "Z" such as Z12, Z18 and the like, which have a certain ' integrated circuit concern.

In block L of FIG. 11, for example, there are a total of four AND gates and two OR gates are provided with the reference symbol Z18, which indicates that all these logic elements are in on the same integrated circuit. Sometimes a second reference number is also given, which is a

7624077 3/17/77

four-digit number - for example 4019 both AND- and ODEB links marked Z18. These further reference symbols denote a certain type of integrated circuits, as they are from the CD series from the Pa. RCA available are. The reference numeral 4019 thus denotes an integrated circuit of the type CD 4019 from Pa. RCA.

Although other companies manufacture similar conventional integrated circuits, the Pa. RCA used and serve as convenient reference numerals in describing the present application. For example, in the Blocl> L a pair of plip-flops 322, 324 as Z19 and with the four-digit Number 4013 designated. This designation indicates that these are in the same integrated circuit of the type CD 4013 of the Pa. RCA, identified here as Z19, is contained in plip-flops. The other numbers and letters at the input and output connections - for example on flip-flop 322 - are the normal connection designations as they are for the integrated circuits of Pa. RCA are common.

These conventional names are only for the sake of clarity the specific mode of operation of the device according to the invention and do not limit the invention. Although Furthermore, the invention has been described based on a specific embodiment, can be based on the executed Details make changes, and it is intended that the invention itself be limited only by the scope of the following claims.

7624077 17.03177 *

Claims (1)

Protection claims . Volumetric pump for pumping a liquid from a source volume into a delivery line with preselected controlled Temporal throughput until a preselected volume of liquid has been pumped, indicated by a volumetric cassette, the liquid from the liquid source volume receives and passes it on to the output line, a chamber with a predetermined volume, which is is a fraction of a liquid source volume, the cassette also being movable in the chamber Piston on v / eist to the chamber upon movement of the piston to fill in alternating directions and at least partially to empty, a drive mechanism for the piston, which is coupled to this in order to drive it alternately and while filling the chamber or at least partially emptying it by a predetermined amount, and by a control that is coupled to the drive mechanism for the piston in order to control it in such a way that it alternates with the piston controlled speed in a direction in which the cassette chamber with the preselected throughput at least is partially emptied until the chamber is emptied by the preselected amount and drifts in the other direction, in which he refills the cassette, whereby the alternating actuation of the piston in one direction is monitored, to determine the volume of liquid pumped out of the cassette until a preselected volume of liquid is selected. has been pumped. 2. Volumetric pump according to claim 1, characterized by a plurality of diagnostic alarm devices that the Monitor pumps of liquid and preselected accordingly Alarm conditions trigger a plurality of separate alarm devices. 3 · Volumetric pump according to claim 2, characterized in, that one of the preselected alarm conditions is the occurrence of air in the output line leaving the cassette chamber is, wherein means are provided to the air in the Detect the output line leaving the cassette, trigger one of a plurality of alarm devices and then the Interrupt the pumping process automatically. H-. Volumetric pump according to claim 3, characterized in that the means for detecting air in the output line from the cassette have a light transmitter which directs light onto the output line leaving the cassette, and a light receiver which detects changes in the light which occur in the presence of Air in the cartridge output line. j ?. Volumetric pump according to claim 4, characterized in that that the output line of the cassette is a transparent plastic tube and the means for detecting air in the same have an external, light blocking channel, 7624077 17.8177 functions when this status is detected, with additional Means are provided that the pumping process in an ErrH »Soc 7.ηοΊ" ατιΛοο s'j ^^ ni ^ ticeil imtcrtrcchcn. 7624077 17.0177 which receives the hose, the light transmitter arranged in this way is that it directs light onto the inner surface of the tube in the channel, and the light receiver detects light that broken by the hose filled with liquid. 6. Volumetric pump according to claim 2, characterized in that one of the preselected alarm states besceht that the control of the pump commands the liquid to pump with the preselected \ temporal throughput, but this actually pumps with a lower than the preselected temporal throughput, and that Means are provided that detect this state and one of a variety of alarm devices 7- volumetric pump according to claim 6, characterized in that \ | that the preselected alarm condition is a closure of a liquid line between the source of liquid to the cassette or in the dispensing line of the cassette. Ö. Volumetric pump according to claim 6, characterized in that that the preselected alarm status is a malfunction the piston drive mechanism is. V. Volumetric pump according to claim 2, characterized in that that one of the preselected alarm conditions is the end of the transmission of the preselected volume of liquid, wherein Means are provided that detect this state and, when it is detected, one of a plurality of alarm devices trigger. 10. Volumetric pump according to claim 9 »characterized by means which in response to adjust to the detection of the end of the transfer of the selected fluid volume control so that the pump will now be made with low predetermined time throughput, gear around the pumping process ■ after the handover of the initially preselected To keep the liquid volume open. 11. Volumetric pump according to claim 2, characterized in that; that it is a battery-operated pump and ! exner of the preselected AlaTmznR-hanclft mß ~ - "f λrriitior οη · ηοτ> ^{! is the} battery voltage which is below a preselected value, means are provided to enable this state j and then trigger one of the multitude of alarms. 12. Volumetric pump according to claim 2, characterized by means responsive to the triggering of one of the plurality of alarm devices responding to deliver an output signal for evaluation at a location remote from the pump. 13 · Volumetric pump according to claim 1, characterized by a scale with which the operator can preselect a desired throughput rate over time. 7624077 17.8177 Volumetric pump according to Claim 13, characterized by a device which is connected to the control and which the measures the time required to refill the cartridge chamber and the speed of the piston when emptying the cartridge accordingly to a higher throughput than the throughput set by the throughput scale, by the amount of filling to compensate for any loss in the cassette chamber. Volumetric pump according to Claim 1, characterized in that a scale is provided on which the operator can use can set a desired volume of liquid to be pumped by the pump. Λ / ΌΊ TT »/ ·» Ή ο- that the volume setting scale has volume display elements, the display of which decreases continuously during the pumping process. ^: 17. Volumetric pump according to claim 1, characterized in that 'that the drive mechanism for the piston is a stepper motor ^! which responds to a pulse control signal from the controller, where a preselected number of step-switching pulses corresponds to a pumped unit amount of the liquid and the pumped amount of liquid corresponds to the frequency of the control pulses. 7624077 3/17/77 1ö. Volumetric pump according to claim 17 'characterized by means, responsive to the step switching pulse signal during the hachfüllens the chamber that occurs during the Nachfüllintervalls number of ^ chrittschaltimpulsen determine and ^D chrittschaltsignal during emptying of the cartridge chamber additional pulses to the total number d adds & r detected pulses, to bring the throughput back to the pre-selected value. 19 · Volumetric pump according to -k _ns p _ruc h 17, characterized in that a device compares the number of stepping pulses with the output movement of the stepping motor in order to monitor the stepping motor for correct movement according to the driving stepping pulse signal, and! the Fuuiptt öL / illegL, if the Ausgarigsbewep ^ ung aes öcnri'ct; - switching motor does not correspond to the driving step switching impulses. 20. Volumetric pump according to claim 1, characterized in that that the volumetric cassette is disposable and additionally lent a facility is provided that the cassette for Holds pumps in the correct position, but allows quick removal of the cassette when changing cassettes, whereby the drive mechanism for the piston can be connected to it by means of a quick-release coupling. 21. Volumetric pump according to claim 20, characterized in that the additional device has at least one pair of pins 7624077 17.0177 .rife .. having, which enter into a complementary pair of openings protrude in order to hold the cassette in the desired position. 22. Volumetric pump according to claim 1, characterized in that the volumetric cassette contains a valve mechanism, controlling the flow of liquid to and from the cassette chamber during filling and emptying of the cassette chamber controls. 23- volumetric pump according to claim 22, characterized! that the valve mechanism has two positions in which [ the control of the liquid flow to and from the! Cassette chamber takes place, with an additional valve Position detecting device is provided that the Detected position of the valve mechanism, and the valve; I device that detects the position coupled with the control system * is to control the direction of action of the piston drive mechanism. Volumetric pump according to Claim 23, additionally characterized by a device which detects the position of the piston drive mechanism and determines when the piston drive mechanism is in an empty cassette or a position corresponding to a full cassette, | wherein the device for determining the piston drive \ mechanics is coupled to the valve mechanism in order to control their work. ν Il It * · * ■ ' ι .It · I I t - 7-1 - 25 Volumetric pump for pumping a liquid from a liquid source to a dispensing line, characterized by a volumetric cassette which takes liquid from the 5 ¹ liquid source and transfers it to the dispensing line and has a chamber with a predetermined volume which is a fraction of the volume of the Is a source of liquid, the cassette further comprising a piston movable in the chamber for filling the chamber and at least partially emptying it by a predetermined amount when the piston moves in one of two directions, a piston drive mechanism is connected to the piston part of the cassette and drives the piston alternately in one of two directions to fill the chamber and at least partially empty it, and a controller is connected to the piston drive mechanism which controls the piston drive mechanism and a first device which alternately drives the piston at a controlled speed in an R. icht drives to empty the cassette chamber at a preselected speed until it is at least partially emptied by a predetermined amount, and drives in the other direction to refill the cassette, and includes a second device with which the alternating drive of the piston is monitored in one direction to determine the volume of liquid pumped from the cassette until a preselected volume has been pumped. 7624077 17.0177 26. Volumetric pump according to claim 25, additionally characterized through a variety of diagnostic warning devices to monitor the pumping of the liquid and to Triggering of a large number of separate alarm devices when preselected alarm conditions are present. 27 · Volumetric pump according to claim 26, characterized in that that one of said preselected alarm conditions, the presence of \ air in the output line of the cartridge chamber, and that means that detect the air in the output line and j then one of a large number of alarm devices beta I and additional funds are provided in: in this case automatically interrupt the pumping process. ί 28. Volumetric pump according to claim 27, characterized ^ that the means for detecting air in the output line of the cassette is a light transmitter that sends light onto the output line directs from the cassette, as well as having a light receiver that changes the through the output line of the Cassette detected light passing through according to the presence of air in the same. 29 · Volumetric pump according to claim 28, characterized in that that the output line of the cassette is a transparent plastic tube and the device for detecting the presence of air is a duct covered from outside light has, which receives the hose and in which the 7624077 3/17/77 Light emitter is located to shine light on the inner surface of the Hoses to be directed within the duct, being the light receiver detects the light refracted by the tube filled with liquid. 30. Volumetric pump according to claim 29 _r characterized ^ that one of the preselected alarm states is that the control of the pump commands liquid (lui.t a preselected temporal) throughput to pump, but the liquid actually with a lower than the preselected throughput is pumped, that means are provided to detect this condition and then to operate one of a plurality of alarm devices, and that further means are provided which automatically interrupt the pumping process in this case. 31 · Volumetric pump according to claim 30, characterized in that that the preselected alarm condition a closure of a flow line from the liquid source to the cassette or The output line of the cassette is. 32. Volumetric pump according to claim 30, characterized that the preselected alarm condition is a malfunction of the piston drive mechanism. 33 · Volumetric pump according to claim 26, characterized in that that the selected alarm state is that the selected one Volume of liquid has been pumped, whereby 7624077 17.0177 Sutζliehe means are provided to record this condition and then actuate one of the plurality of alarm devices. 34. Volumetric pump according to claim 33, characterized by Hittel which, when the preselected volume of liquid has been pumped through, to this state in response to switch control to a low predetermined pumping rate for the pumping operation after reaching the ^superiors: keep open selected pumping volume. 1 35- volumetric pump according to claim 26, characterized in that that the pump is battery charged and one of the preselected! Λ1 oYimanri-l-ä-nrin / ίο-πί ■ »-> ΚΛη4- _Λ ν» 4- A « Ω AA * -«. Π «-ί — l · - Λ-ηή --ν * - -ν *. «-.-» - * -ν »1 1 · * ™ » -.- »- ν J ...» »I A .ι-ι ^ χ. '»" «Ο U ^ A-LVJ-SS U.UIJ. J-IJ. 1- / 0OUCJlJ-Li ₅ VXCUO VJ-JLCJ J-ICl U UC JL-T_ ^ QJ _r /OllllUll.l Genealogie 5 W ^ A UCi 'j falls a preselected value, means being provided which, in response to this condition, actuate one of the plurality of separate alarm devices. 36. Volumetric pump according to claim 26, characterized by means which respond to the actuation of one of the plurality of alarm devices and deliver an output signal for evaluation at a location remote from the pump. 5 /. Volumetric ± UMPE according to claim 25, characterized by adjustable e.tne Durcnsatzskala at which the operator can select a desired throughput. 7624077 3/17/77 58- Volumetric pump according to claim 37, characterized by means which are connected to the control, which for Measure the time required to refill the cartridge chamber and Adjust the piston speed so that the emptying of the cassette chamber is higher than that indicated on the flow rate scale The set throughput takes place in order to compensate for the loss of time that occurred when refilling the dex 'cassette. 39 · Volumetric pump according to claim 25, characterized by an adjustable volume scale on which the operator can set a desired volume of liquid to be pumped. 40. Volumetric pump according to claim 39: characterized dbua the Tolunieiiskala display element on we ~, its display value smaller as the liquid is pumped continuously will. 4-1. Volumetric pump according to claim 25, characterized in that that the piston drive mechanism contains a stepper motor that responds to a stepping pulse signal from the controller responds, and that a predetermined number of the stepping pulses of a unit quantity of the pumped liquid and the time throughput of the liquid corresponds to the frequency of the activating step switch pulse signal. 7624077 17JI77 42. Volumetric pump according to claim 25, characterized in that that the volumetric cassette contains a valve mechanism and additional means which are coupled to the valve mechanism and the flow of liquid to and from the cartridge chamber during filling and emptying of the Control the cassette chamber. 43. Volumetric pump according to claim 42, characterized in that, that the valve mechanism has two positions to control the flow of liquid to and from the cassette chamber, as well has a device for determining the valve position, which detects the position of the valve mechanism and to which Control is coupled to the direction of action of the piston; to control drive mechanics. : i 4. Volumetric pump according to claim 43, characterized by ■ a device for detecting the position of the piston drive mechanics that detects when the piston drive mechanism is ι is in the position corresponding to an empty cassette chamber and that of a full cassette chamber, the j Device for detecting the position of the piston drive mechanism to control the function of the valve mechanism is coupled to this coupled device. 45. Device for use in a pump for pumping a Liquid with a preselected controlled flow rate from one Source volume through the cassette and into a dispensing line until a preselected volume of liquid has been pumped, 7624077 17.0177 characterized in that the pump has a drive mechanism for controlling the filling process and the at least partial emptying of the cassette and a valve control mechanism to control the delivery of the liquid from the source volume to the cassette and the flow of liquid from the cassette to the discharge line, that a volumetric Cassette receives the liquid from the liquid source and forwards it to the dispensing line and a chamber with a predetermined volume of a size which is a fraction of the volume of the liquid source ^; a piston movable in the chamber, which can be coupled with the drive mechanism in the pump in order to fill the chamber) and at least partially by a predetermined amount ^: empty when the piston is in alternating seals with ou -.- ueruüg aurcn aie AiiOriebsiuecriaiii *. moves, and has a valve mechanism that can be moved back and forth between at least two positions and can be coupled to the valve stem mechanism of the pump in order to control the delivery of: the liquid to and the flow of the liquid from the: cassette chamber when the piston moves in the alternating ^; to control smelting seals. 4-6. Volumetric cassette according to Claim 46, characterized in that that the volumetric cassette is disposable and additional Has gown to hold the cassette in place in the pump during pumping and a quick removal of the cassette for replacement allow, with the piston still a quick coupling 7624077 17.0177 for connection to the drive mechanism. 4-7 Volumetric pump according to claim 46, characterized! that the additional means include at least two openings which receive a complementary pair of pins projecting from \ forth the pump to allow snap the cassette into its operating position. 4ö. Volumetric pump for pumping a liquid from a _; Liquid source volume to a dispensing line at a preselected controlled flow rate until a preselected volume of liquid has been pumped, characterized by a volumetric cassette which picks up liquid from the liquid source volume and delivers it to the dispensing line. passes, through a chamber with a predetermined volume, at! which is a fraction of the liquid source volume, the cassette further comprising an irid chamber < movable piston for filling the chamber and at least partially emptying it by a predetermined amount as the piston moves in the alternating seals, by a piston drive mechanism , which is coupled to the piston in order to drive the piston in alternating seals and so to fill the chamber and at least partially empty it, by a controller which is connected to the piston drive mechanism in order to control the latter, the controller having a first device to drive the piston alternately at a controlled speed in one direction and thereby the cartridge chamber at least partially around one 762407? 17.0177 to empty predetermined narrow with preselected throughput until the chamber is at least partially empty, and to drive the piston in the opposite seal to the cassette to fill, as well as a second device to the alternating drive of the piston in one direction monitor and determine the volume of fluid pumped from the cassette up to a preselected volume of fluid has been pumped, a first diagnostic alarm device to the second device is connected and triggers an alarm when the preselected volume of liquid has been pumped, whereby a second diagnostic alarm device the piston drive mechanism monitors and detects when the piston works with lower ^ than the preselected speed and then triggers an alarm. 49. Volumetric pump according to claim 48, characterized in that that actuation of the second diagnostic alarm closes a fluid line from the fluid source volume to the cassette or the output line of the cassette. 50. Volumetric pump according to claim 48, characterized in j that the actuation of the second diagnostic alarm represents a malfunction of the Kolen mechanics. 5> 1. Volumetric pump according to Claim 48, characterized in that through additional funds based on the actuation of the first 7624077 17.0177 in response to the diagnostic alarm device, adjust the controller to a low predetermined pump flow rate, j to keep the pumping process open even after the preselected volume of liquid has passed through. \ 52. Volumetric pump for pumping a liquid dispensed from a liquid source volume into a dispensing line with a preselected controlled throughput, characterized by; a volumetric cassette for containing liquid; from the liquid source volume and its transfer to diel Dispensing line, through a chamber of predetermined volume, which is a predetermined fraction of the liquid volume acts, with a movable in the hammer; Piston to move the chamber downwards when the piston moves: alternating directions to fill and at least partially to empty a predetermined ^ narrow, and by a piston drive mechanism, which is coupled to the piston to drive it in alternating directions and the chamber to fill and at least partially empty, by a control coupled to the piston drive mechanism, which the Controls the piston drive mechanism in such a way that it drives the piston at a controlled speed in one direction, in order to empty the cassette chamber at least partially by a predetermined amount at a preselected speed, until the chamber is at least partially emptied and that this drives the piston in the opposite direction, in order to refill the cassette, by a device which is connected to the output line of the cassette and which 7624077 17.0a 77 Presence of air in the output line detected, and through, an alarm mechanism connected to the detection device and if air is detected in the line, an alarm is triggered and the liquid is automatically pumped then interrupts. 5r> - Volumetric pump according to claim 52, characterized in that j that the device that detects air in the output line of the cassette is a light emitter that shines light on the output line of the cassette, as well as having a light receiver that changes the output line of the Cassette detected light passing through according to the presence of air. 54. Volumetric pump according to claim 53, characterized in that. that the output line of the cassette is a transparent plastic tube and the device for the detection of air has a channel which is covered against outside light and which receives the hose, the light transmitter being arranged in such a way that that it directs light onto an inner surface of the tube in the channel, and the light receiver that of with liquid filled tube broke loves captured. 55- Battery operated volumetric pump for pumping eggs out a liquid source volume to a dispensing line with a preselected throughput of liquid passed on through a volumetric cassette, the liquid 7624077 17.0177 from the liquid volume and this to the output line passes, through a chamber of predetermined volume, which is a fraction of the liquid source volume acts, wherein the cassette further comprises a movable piston in the chamber around the To fill the chamber and at least partially when the piston is moved in one of two directions by a predetermined amount frenge to empty and by a piston drive mechanism, which is coupled to the piston and this for filling and at least partially emptying the chamber in alternating directions, by means of an attached to the piston drive mechanism coupled control that drives the piston drive mechanism in such a way controls that this drives the piston at a controlled speed in one direction, uni the KsssettenkauHner tnii; a preselected rate at least partially around i agreed empty henge a vorb ^ until the -ammer ^is at least partially empty to the piston in the opposite f drive seal to fill the cassette through an a device coupled to the öoden, which controls the voltage of the battery detected, and connected to this device by a Alarm & echanik that triggers an alarm if you establishes that the battery voltage is below a preselected level worth falling. Volumetric pump for the rumpec one from a liquid source volume dispensed liquid to a dispensing line with a preselected controlled flow rate until a preselected fluid volume has been pumped with a volume 7624077 17.0177 tric cassette, which takes up liquid from the liquid source volume and passes it on to the dispensing line, through a k-otnmer predetermined volume in the cassette, which makes up a fraction of the liquid source volume, a piston movable in the chamber in order to fill the chamber and at least partially empty it , when the piston moves in alternating seals, by a piston drive mechanism that is coupled to the piston and drives the piston in alternating directions in order to fill the chamber and at least partially empty it, through an adjustable flow rate scale, on which a desired liquid flow rate is can be pre-selected by the operator, through an adjustable volume scale on which the operator can pre-select the desired volume of liquid to be pumped by the pump, and also a control connected to the flow rate scale and the volume scale as well as to the piston drive mechanism to alternate around the piston with gesture uter speed to drive in one direction in order to empty the cassette with the throughput set on the throughput dial at least partially by a predetermined amount until the chamber is at least partially emptied, and to drive the piston in the opposite direction to the Refill the cassette and monitor the ' alternating drive of the piston in one direction' and determine the volume of liquid pumped out of the cassette until the volume preselected on the volume scale has been pumped. 7624077 17.0177 57 · Volumetric pump according to claim 56 »characterized by additional means connected to the control measure the time it takes to refill the cassette is required, and the speed of the plunger when emptying the cassette is higher than that with the Set the preselected throughput scale to the one when filling up to compensate for the loss of time that has occurred in the cassette chamber. 58. Volumetric pump according to claim 56, characterized by Display elements for the volume on the volume scale, the display value of which decreases continuously during the pumping process will. 5V. Volumetric pump for pumping a liquid out of a Liquid source volume to a dispensing line with a preselected controlled flow rate, up to a preselected liquid volume has been pumped, characterized by a volumetric cassette for receiving liquid from the Liquid swell volume and pass it on to the Dispensing line, through a chamber of predetermined volume, which is a fraction of the fluid volume is a matter of which hammer continues to be a movable in inr Piston for filling and at least partial emptying when moving the piston in alternating seals has, by a Ko.ibenantriebsmechanik with a Stepper motor, which is coupled to the piston in order to move it in alternating directions according to a stepping 7624077 17.9177 To excite a pulse signal to fill and at least partially empty the chamber, a predetermined number of Stepping pulses of a quantity of the pumped liquid and the throughput of the pumped liquid Frequency of the stepping pulse signal correspond, and by a controller coupled to the piston drive mechanism and providing a stepping pulse signal that the piston drive mechanism for alternating drive of the Piston with controlled speed according to the magnitude of the stepping pulse signal in one direction propels to the cartridge chamber at least partially by a predetermined amount at a preselected speed Empty until the cartridge chamber is at least partially empty and around the piston in the opposite direction et u ui w_i_ utiJU, Uuj Controls the number of pulses delivered to the stepper motor to drive the piston in one direction monitored to determine the volume of liquid leaving the cassette up to a preselected volume of liquid has been pumped. 60. Volumetric pump according to claim '3τ', characterized in that that the control contains a device to the number of ochrittschaltimpulse supplied to the stepping motor to count continuously and thus to continuously determine the amount of residual liquid to be pumped. 7624077 17.6177 61. Volumetric pump according to. Claim 59, characterized by additional means responsive to the index pulse signal during refilling of the cartridge chamber, the Store the pulses of the driving pulse signal during the refill period and the driving pulse signal during after emptying the cassette, continue adding pulses up to the number of pulses stored to allow fluid flow set to the preselected value ". | 62. Volumetric pump according to claim 59, characterized by! further means that increase the size of the stepping pulse signal n, it the movement of the output shaft of the stepper motor i compare in order to monitor the correct movement of the stepper motor according to the activation by the applied stepper ^: switching pulse signal and to interrupt the pump operation if the movement of the output shaft of the stepper motor does not match the size of the activating stepper; switching pulse signal corresponds. 63. Volumetric pump for pumping a ^{liquid from a source volume:} dispensed liquid into a dispensing line with a preselected controlled throughput, characterized by a volumetric cassette which absorbs liquid from the liquid source volume and transfers it to the dispensing line gives, through a chamber of predetermined volume in the cassette, a fraction of the liquid source volume makes up, with the cassette still one in the chamber movable piston includes to fill the chamber upon movement of the piston in one of two directions and at least partially to empty, by a piston drive mechanism which is coupled to the piston and it in a propels from two directions in order to fill the chamber and at least partially empty it, by means of a valve mechanism, controlling the flow of liquid to and from the cassette chamber during filling and at least partial emptying the cassette chamber controls, and by a controller that is coupled to the piston drive mechanism to the Piston drive mechanisms control that they alternate the piston at a controlled speed in one direction drives, in which the valve mechanism is in a position in which the cassette chamber with a preselected throughput is at least partially emptied until the chamber is at least partially empty, and the piston in the opposite Direction drives the valve mechanism in a second position to fill the cassette is located. 64. Volumetric pump according to claim 6 ^, characterized by an additional device for detecting the valve setting, which is coupled to the controller, about the effective direction to control the piston drive mechanism. 65. Volumetric pump according to claim 64, characterized by additionally a device for detecting the position of the Piston drive mechanism in the empty and full 782 * 077 Cassette chamber corresponding position, with the device for detecting the position of the piston drive mechanism on the valve mechanism is coupled to control the valve mechanism. 66. Apparatus for use in a pump for pumping fluid at a controlled speed between a Source and a person, the pump having a first device for pumping the liquid and a second device for controlling the pumping of the liquid between the source and the person, characterized by a hollow chamber with a certain volume and a first and a second conduit, which chamber allows the passage of liquid between the source and the chamber through the first conduit and for the passage of the liquid between the chamber and the person allowed through the second conduit, the chamber and the first and second conduits being arranged so that the passage of the Fluid between source and chamber and between chamber and person without touching the pump or the first or the second Device made possible by a piston arranged in the chamber, which is moved by the first device in a first direction can be moved to the liquid through the first conduit between the chamber and the source and also in a second, the first opposite direction in which the liquid flows from the chamber to the person, through a in flow communication with the chamber and the first and second conduits standing valve with a first and a second position, the in the first position the flow of liquid between the source and the chamber enables a flow of the 7624077 17.0177 Prevents liquid between the chamber and the person, and that in the second position prevents the liquid from flowing between allows the chamber and the person, but prevents the fluid from flowing between the source and the person, and by means of the chamber and there? Connect the valve to the pump. 67. Apparatus according to claim 66, characterized in that Means are operatively coupled to the chamber having a certain mutual arrangement of the valve and the second device cause in the pump so that the valve can be operated by the second device. 68. Apparatus according to claim 66, characterized in that Means are operatively coupled to the chamber having a certain mutual relationship of the piston to the first device cause in the pump so that the piston can be actuated by the first device. 69 Device according to Claim 68, characterized in that a latch is operatively connected to the chamber and cooperates with a latch on the pump to to connect the chamber quickly with the pump in a fixed mutual assignment and a quick separation of the chamber from the Allow pump. 70. Apparatus according to claim 69, characterized in that 762407717.03.77 ι the locking device on the Kanmer nü.t the locking device the pump interacts in the manner of a plug-socket arrangement and in that means are operatively coupled to the chamber for a particular mutual arrangement between the valve and the second device in the pump so that the valve can be actuated by the second device. 71. Apparatus for pumping liquid between a source and a person characterized by a reciprocating drive member, pump means operable to reciprocate the drive member in a controlled manner, a hollow chamber having a predetermined volume and first and second conduits, the chamber being arranged to be the through-σαησ vnn ΡΐίΊςςΐ olcpi t νηπ Λρτ Oiifilift to the chamber through the; first line and from the chamber to the person through the second line made possible by a piston arranged in the chamber, which with the drive element in a first direction, in which liquid can pass through the first line between the chamber and the source, and in a second, the first opposite direction reciprocable, in which liquid can flow between the chamber and the person, through a valve arranged in flow communication with the chamber and the first and second conduits and having a first and a second position shown in the first position operationally allows a flow of liquid between the source and the chamber and prevents between the Karniie-φηά the person and that in the second position operationally a flow of liquid between 7624077 17.0177 the chamber and the person allowed and prevented between the source and the chamber, by a valve control that operates on the Responses reciprocating movement of the drive element in the first or the second position and the reciprocating movement of the drive elements in the other, i.e. second or first position, and that the hollow chamber, the piston and the valve are operatively separated from the drive element, the pumping device and the valve control to allow the liquid to pass through the chamber and the first and second conduits between the Source and the person can be pumped without using the drive and
element, the pumping device / valve control in contact to kick. the movement of the drive element in one, - was correct of the two Addresses to and fro directions to determine the time for the element to move in that particular direction, and by means which, in response to the time determined by the aforesaid means, do so during the movement of the drive element is compensated in the other of the two reciprocating directions. 73. Apparatus according to claim 71, characterized by a device responsive to the transfer of liquid from the chamber and the amount of liquid thus transferred measures, and by means of a device which acts on the cumulative transfer of a certain amount of the liquid from the chamber I. 762407? 17.8177 responds and then reduces the level of transfer of the liquid from the chamber to a certain minimum. 74. Apparatus according to claim 72, characterized by an operationally in the first or the second line connected device, which determines whether through this particular line Fluid flows, and through a device responsive to the determination made by the aforesaid device and the flow of liquid through that particular conduit interrupted when the aforementioned device detects that not only liquid is flowing through this line. 75 ο Device according to claim 71, characterized by an operationally device coupled to the pump that determines whether the pump is operating at a preselected flow rate, and by a facility responsive to the determination made by the aforementioned facility and the operation of the Pumping stops when the pump is working with a lower flow rate than the specified one. 76. Apparatus according to claim 73, characterized in that the pump has a stepper motor that operates on a step-by-step basis works to pump a certain amount of liquid with each step, and that means are provided which respond to a movement of the drive element respond in a certain of the reciprocating directions to the number of steps in the Ectrieb determine the stepping motor during the reciprocating motion, 7624077 17.0177 and that means are provided based on those of those previously mentioned Means address made determination and this accordingly during the operation of the engine when driving the drive element cause compensation in the other of the two back and forth movements. 77. Device for use with a Punroe for guiding a Controlled flow fluid between a source and a person, characterized in that the pump has a. first device of a first particular configuration which is constructed so that a flow of the liquid with the specific throughput takes place, a second device of a second specific configuration, which is constructed so that the Direction of the liquid flow determined, as well as a third device having a third specific configuration which is designed to nest and is further characterized by a hollow chamber containing a can store a limited volume of liquid to be transferred from the source and the person and a first and a two-- te line, which is in flow connection between the! Source and the person are disposed back by a in the chamber in alternate directions successively and herbeweg-., I cash flask during a movement in a hold back the set directions of reciprocation in the sequence the input of liquid into the chamber and during the movement of the piston in the other of the two opposite reciprocating directions in sequence If the liquid from the chamber is effected by a device 7624077 3/17/77 - 94 - a with one of the first particular corresponding configuration, | to interfit between the first means and the piston for operation of the piston in opposite directions To allow reciprocating directions through the first device, through one between a first and a second Position reciprocating valve which, in the first position, is operative in fluid communication between the source and establishes the chamber through the first conduit and prevents flow communication between the chamber and the person, and that in the second position operationally a flow connection between the chamber and the person to be supplied through the second line establishes and prevents a flow connection between the source and the chamber, by means of a device with one of the second particular corresponding configuration for interfitting between the second device and the valve to effect the controlled operation of the valve between the first and the second position, and by means of one of the third particular corresponding configuration that involves a fixed arrangement of the chamber and piston and valve relative to the Pump causes. 78. The device according to claim 77, characterized in that the device with the third specific configuration at least is a pair of spaced pins or a pair of spaced holes. 79. Apparatus according to claim 77, characterized in that - 95 - the piston protrudes into the chamber and a portion lying outside the chamber mating coupling with the having first device. I 694 / OR.-ro 7824077