SU1602539A1 - Infusion pump - Google Patents

Abstract

The invention allows the intravenous infusion of drugs when using a roller pump with high accuracy at low flow rates of biological fluid. This is achieved by switching the pump to the forced mode at the rate of fluid supply in the phase of the pump roller exit from contact with the pipeline. For this, an infusion pump comprising a feed control 6 and a drive motor 1 connected to the outlets of the control system and mechanically connected to the roller pump 2 is equipped with a boost sensor 7 mounted on the roller pump 2 and the waiting multivibrator 8 generating a boost switch-on signal, as well as their controlled switch 4, which switches on the specified signal of the control system of the driving motor 1 from the feed setpoint 3, which determines the rotation frequency of the engine 1 in the main mode, guide dosing required liquid supply to supply the marginal dial 6 forming the flow parameters in the boost mode. 3 il.

Description

The invention relates to medical. Equipment, namely to dispensers of medicinal faiths (and can be used for intravenous infusion.

The purpose of the invention is to increase the accuracy of dosing of biological fluid at low flow rates.

Fig, 1 shows the structural scheme of the infusion pump; Figure 2 shows a force sensor; in FIG. 3, view A in FIG. 2; Fig. 4 shows fluid flow diagrams.

The infusion pump contains a drive motor 1, a roller pump 2, a liquid flow setting device 3, a switch 4, a drive control system 5

motor, setting device 6 for supplying maximum, sensor 7 forcing, waiting for multivibrator 8, controlled oscillator 9, driver 10 for phase sequence, controlled by source. current nickname 11, cylindrical support surface, surface 12, pipeline 13, support surface 14, sensing element 15, mod l tor 16, radiator 17, photo receiver 18, pulse converter 19, carrier 20, rollers 21 (2 1) . The device works as follows.

The dials 3 and 6 set the required rotational speed of the drive engine 1 in the main and forced modes, respectively, and for the time I specify O5 O 1CH E

WITH

the common RC circuit of the standby multivibrator 8 is the duration of the control signal of the switch 4, corresponding to the time the roller 21 (21) leaves the contact with the pipeline 13 of the roller pump 2 ,.

If, when the device is turned on, the rollers 21 (2g) are outside the speed forcing zone, they rotate uniformly with a frequency whose value is set by the setting device 3 (since the pins of the modulator of the 16 luminous flux do not block from radiator-1 | 5 l 1 to the photodetector 18 of the sensitive element 15 of the force sensor 7). At the same time, the control signal from the force sensor 7 is absent, and the setpoint 3 is connected via the switch 4 to the input of the drive engine control system 5. Depending on the frequency of these pulses, the output of the formaitit 10 produces amplitude-constant sitgusoidal signals shifted by 120 °, the frequency of which determines the rotation frequency of the single-pole motor 1 or Atna number polyusov.dvigatel.

The source of current controlled by these signals generates sinusoidal currents in the windings of the engine 1, ensuring uniform rotation of the rotor, mechanically connected with the carrier 20 of the rollers 21 (2l) of the roller pump 2, with a frequency determined by the signal level of the control unit 3,

At the moment when the roller 21 (21) passes point A of co-operation of the supporting surfaces 12 and 14 of the pipeline 13, the corresponding pin of the modulator dc 16 of the light flux blocks the light beam of the emitter 7 and thereby triggers the pulse converter 19. The waiting multivibrator 8 (FIG. 1) on the output of the converter 19 of the force sensor 7 starts and generates a signal whose leading edge corresponds to the beginning of the output of roller 21 (21) from contact with pipeline 13, and the falling edge coincides with the moment of output roller 21 (21) out of contact with the pipeline 13, for an even selecting the corresponding signal duration.

At the same time, the switch 4 connects the setpoint 6 to the input of control systems 5 on the leading edge of the signal from the multivibrator 8, which increases the rotational speed of the engine 1 to the limit value set by setpoint 6, and on the falling edge of this signal disconnects the setpoint 6 from output setting knob 3 filing.

The engine's rotational rotational speed is chosen so that the time taken by roller 21 (2l of the boost zone (i.e., the zone where the roller comes out of contact with the pipeline, starting from point A) is minimum less than a second. Then, in contrast to when the flow rate is less than 0.1 l / min, the time it takes for the roller outflow trajectory (e.g., 21) to come out of contact with the pipeline 3 reaches 1 minute, during which the next roller feeds the liquid only to compensate for the volume released by the spraying roller 21, in p edlagaemom device fluid flow rate at the outlet of the pump 2 is interrupted for a significantly shorter time, with the result that also the inertia shtyva flow in these conditions comparable with the time it interrupts fluid metering accuracy is increased (see Figure 4).

Due to the large time T of the roller coming off the pipeline in the device. The prototype of the metering error UQ (Fig. 4, plot a) significantly results in the error at the forced time T, the roll off (plot b) for the proposed device.

Claims (1)

Thus, the acceleration of the rotation of the rollers 21 (2l) along the path of their arch from the pipeline 13 of the roller pump 2 helps to reduce in time the phase of interruption of the flow from the pump and the flow actually becomes continuous, which improves the accuracy of the dosing of the liquid. Invention Formula The infusion pump containing the feed control unit, the drive motor control system fy and connected to the drive motor control system ,. mechanically coupled to a roller pump, which means that it is connected to a chain . but Phie.1 , ; "2G 21 13  /, / V 18 FIG. 2 (Pug.3