CN100352519C

CN100352519C - Trace transfusion pump

Info

Publication number: CN100352519C
Application number: CNB031403271A
Authority: CN
Inventors: 杨明杰; 周建嫦; 杨杏芬; 黄俊明
Original assignee: CENTRE FOR DISEASE CONTROL AND PREVENTION OF GUANGDONG PROVINCE
Current assignee: CENTRE FOR DISEASE CONTROL AND PREVENTION OF GUANGDONG PROVINCE
Priority date: 2003-08-29
Filing date: 2003-08-29
Publication date: 2007-12-05
Anticipated expiration: 2023-08-29
Also published as: CN1589915A

Abstract

The present invention relates to a microinfusion pump with low cost and high automation. The microinfusion pump comprises an iron sheet, a transfusion hose, a spring on an input end, a button on the input end, an extrusion spring, an extrusion button, a spring on an output end, a pressing device on the output end and an electromagnet control device, wherein the extrusion spring is positioned between the spring on the input end and the spring on the output end; the button on the input end, the extrusion button and the pressing device on the output end are respectively connected one end of the spring on the input end, one end of the extrusion spring and one end of the spring on the output end; the input spring and the extrusion spring are installed on the iron sheet and are positioned between the iron and the transfusion hose. The spring on the input end is longer than the extrusion spring. The pressing device on the output end pushes the transfusion hose and seals the output end. The electromagnet control device comprises an electromagnet used for controlling the iron sheet. Liquid in the hose of the present invention only makes contact with the hose, and thus, is not easy to pollute. The adoption of the electromagnet control device can accurately control the transfusion quantity and the automation degree is high. The present invention can be used by matching frequently used disposable transfusion systems, and does not need a special hose. Therefore, the price of consumable material is low.

Description

Microinfusion pump

[affiliated technical field]

The present invention relates to a kind of microinfusion pump.

[background technology]

Along with the development of modern biomedical, people use the transfusion of constant speed trace more and more.As wish that can anesthesia continuing infusion lentamente with less dosage gives patient when anaesthetizing, also wish during oncotherapy and medicine slowly can be transported to target position exactly, need continue to pour into by stomach tube during zoopery to animal, dynamic cellular cultivate to need constantly all need to infuse with the speed that per minute be counted microlitre even per hour count microlitres for cultured cell upgrades culture fluid etc., and not only require the flow velocity of trace transfusion, but also requirement side controls the amount of infusion in the different unit interval more accurately.Everything realization that is the trace transfusion has proposed new high requirement.In Experiment of Instrumental Analysis, need use the transfusion of constant speed trace in addition equally.

Present pump mechanism kind is a lot, but microinfusion pump is less, and peristaltic pump, microinfusion pump etc. are only arranged; The basic functional principle of peristaltic pump is to drive cloverleaf roller extruding infusion tube by motor to realize the liquid conveying, mainly regulates the rotating speed of motor and the diameter of infusion tube and reaches adjusting transfusion speed purpose; The vortex motive force that microinfusion pump generally adopts the driven by motor propeller to rotate generation realizes the conveying of liquid, carries the adjusting of flow rate of liquid mainly to rely on the adjusting rotating speed of motor; In addition, the device that the microinfusion pump that has adopts motor to drive transfusion propeller promotion syringe-like is realized the trace transfusion, and transfusion speed is regulated also and mainly realized by the speed of regulating motor; The microinfusion pump that has is then realized the liquid conveying with the micro device of the similar steam engine piston of driven by motor, and the adjusting of transfusion speed can be achieved by regulating rotating speed of motor and piston volume.Be not difficult to find out that a common feature of above infusion pump is to adopt general motor or step motor drive, cost is higher, cost an arm and a leg, to such an extent as to be difficult to apply, and automaticity is lower.Peristaltic pump need be equipped with special hose and could move in addition, and microinfusion pump regular meeting causes the pollution to institute's infusion liquid, but uses disposable micro infusion pump cost too high.

[summary of the invention]

In order to overcome existing microinfusion pump cost height, automaticity and the low problem of accuracy, the invention provides that a kind of cost is low, automaticity and the high microinfusion pump of accuracy.

The microinfusion pump that the present invention is adopted for its technical problem of solution comprises iron plate, infusion tube, the input spring, the input button, extrusion spring, squeeze buttons, the outfan spring, outfan press device and electromagnet control device, extrusion spring is between input spring and outfan spring, the input button, squeeze buttons and outfan press device are connected to the input spring, extrusion spring and outfan spring one end, the length of input spring is bigger than extrusion spring, and between iron plate and infusion tube, the length of input spring and extrusion spring is inconsistent, the outfan press device is pushed infusion tube, with the outfan sealing of infusion tube, electromagnet control device comprises that one is used to control the electric magnet that iron plate moves.

Compared to prior art, microinfusion pump of the present invention is realized the trace transfusion easily, is easy to the controlling liquid input quantity, adopts electromagnet control device that electric magnet is controlled, and can accurately control amount of infusion, the automaticity height.Because the liquid in the flexible pipe only contacts with flexible pipe, so be difficult for contaminated to the liquid of institute's infusion.The present invention can be used with the disposable transfusion device that hospital uses always, does not need special special hose, the cheap and acquisition easily of consumptive material.

[description of drawings]

Fig. 1, Fig. 2, Fig. 3 and Fig. 4 are that the pump installation of microinfusion pump of first embodiment of the invention is at the sketch map of each state;

Fig. 5 is the sketch map of the electromagnet control device of microinfusion pump of the present invention;

Fig. 6, Fig. 7, Fig. 8 and Fig. 9 are that the pump installation of microinfusion pump of second embodiment of the invention is at the sketch map of each state.

[specific embodiment]

See also Fig. 1 and Fig. 5, the microinfusion pump of the first embodiment of the present invention comprises pump installation 1 and electromagnet control device 2.This pump installation 1 comprises iron plate 15, infusion tube 14, input spring 10, input button 12, extrusion spring 11, squeeze buttons 13, outfan spring 20, outfan press device 21 and substrate 22.Extrusion spring 11 is between input spring 10 and outfan spring 20.Input button 12, squeeze buttons 13 and outfan press device 21 are connected to an end of input spring 10, extrusion spring 11 and outfan spring 20.Input spring 10 and extrusion spring 11 are installed on the iron plate 15, and wherein the length of input spring 10 is bigger than extrusion spring 11.Outfan spring 20 is installed on the substrate 22, and between infusion tube 14 and substrate 22.Outfan press device 21 is one to have the fixture block on inclined-plane (indicate), and this inclined-plane helps forming the component of dead spring 20, outfan press device 21 is pushed open, thereby made the liquid in the infusion tube 14 press to outfan.Outfan spring 20 promotes outfan press device 21 extruding infusion tubes 14, and the outfan of infusion tube 14 is sealed, and liquid can not be circulated.

Electromagnet control device 2 comprises input equipment 40, encoder 41, memory 42, enumerator 43, comparator 44, quartz crystal oscillator 45, frequency divider 46, decoder 47, display device 48 and electric magnet 49.Electric magnet 49 is installed on and iron plate 15 corresponding positions, is used to produce electromagnetic attracting force or pushes iron plate 15.Electromagnet control device 2 is by the energising of input equipment 40 input electric magnet 49, power-off time and each extruding liquid output amount etc., deposit memory 42 in behind encoded device 41 codings, after accepting enabled instruction, frequency divider 46 occured frequently 0.01 second from quartz crystal oscillator in 45 minutes, and begin to count power-off time by enumerator 43, when power-off time default in power-off time that comparator 44 relatively obtains timing and the memory 42 equates, send power on signal, electric magnet 49 energisings, enumerator 43 begins to count conduction time, when comparator 44 relatively obtains equating with the default conduction time of memory 42 storages conduction time, send power-off signal, electric magnet 49 outages, so move in circles, unison counter 43 count cycle number of times multiply each other cycle-index and each extruding liquid output amount of presetting, the amount of liquid of exporting infusion is shown in display device 48 to decoder 47 through decoding.When equated with default running time running time, electric magnet 49 cut off the power supply automatically, and sent the alarm of program end of run.

See also Fig. 1 to Fig. 4, when electric magnet 49 was not switched on, the elastic force of outfan spring 20 promoted the outfan sealing of fixture block 21 with infusion tube 14, and the liquid in the infusion tube 14 can not circulate; Electric magnet 49 energising back electromagnetic attracting forces or push iron plate 15 to pressing down, because the length of input spring 10 is bigger than extrusion spring 11, input button 12 on the input spring 10 at first seals the input of infusion tube 14, and along with electromagnetic attracting force iron plate 15 to pressing down, the input of infusion tube 14 is closed closelyr, and the liquid between input button 12 and the fixture block 21 can not flow to the input (see figure 2); Along with iron plate 15 to pressing down, squeeze buttons 13 is pushed infusion tube 14, the pressure of infusion tube 14 this moment between input button 12 and fixture block 21 rises, produce downward component on fixture block 21 inclined-planes, promote fixture block 21 downward pressing springs 20, output port is opened, and liquid is pressed to the outfan (see figure 3); When electric magnet 49 outages, iron plate 15 is by the restoring force resilience (see figure 4) of input spring 10, extrusion spring 11 and infusion tube 14.The pressure of infusion tube 14 between input button 12 and outfan press device 21 descends, and the elastic force of outfan spring 20 promotes fixture block 21 rapidly with the outfan sealing of infusion tube 14, and liquid can not reflux.Input button 12 is opened, and the input of infusion tube 14 is open, along with infusion tube 14 distortion recover formed captivation, liquid is sucked (see figure 1) from input.Like this with electric magnet 49 do not stop open close, make iron plate 15 constantly drive input buttons 12 and squeeze buttons 13 extruding infusion tubes 14, liquid is constantly pumped.By the amount of liquid of the control energising number of times of electric magnet in 49 unit interval and each extruding output, the accurate amount of control pump device 1 output liquid just.

See also Fig. 6 to Fig. 9, the second embodiment of the present invention and first embodiment are basic identical.Difference in, outfan press device 21 is a clip, outfan spring 20 1 ends are installed on iron plate 15, the other end is connected with clip 21.When electric magnet 49 is not switched on, clip 21 clamps sealing by self elastic force with the outfan of infusion tube 14, the liquid (see figure 6) that can not circulate, electric magnet 49 energising back electromagnetic attracting forces or push iron plate 15 to pressing down, input button 12 on the input spring 10 also seals the input of infusion tube 14, and along with electromagnetic attracting force iron plate 15 to pressing down, input seals closelyr, makes the liquid between input button 12 and the outfan press device 21 can not flow to the input (see figure 7); When the squeeze buttons on the extrusion spring 11 is pushed infusion tube 14, the pressure of the infusion tube 14 between input button 12 and outfan press device 21 rises, and the outfan spring 20 that links to each other with clip 21 is pushed clip 21, it is opened, thereby make liquid press to the outfan (see figure 8); When electric magnet 49 outages, clip 21 relies on the rapid resilience of himself elastic force, outfan is clamped sealing, liquid can not be refluxed, and rely on the elastic force of outfan spring 20 that iron plate 15 is resetted, lift input button 12 and squeeze buttons 13, open input, infusion tube 14 is also according to self elastic reset (see figure 9); Infusion tube 14 deformation recover formed captivation liquid are sucked (seeing accompanying drawing 6) from input.Like this with electric magnet 49 do not stop open close, liquid is constantly pumped.By the amount of liquid of the control energising number of times of electric magnet in 49 unit interval and each extruding output, just accurately control pump goes out the amount of liquid.

Same the present invention also can adopt single-chip microcomputer to control the energising and the outage of electric magnet 49.

Because the liquid in the infusion tube 14 only contacts with flexible pipe, so that the liquid of infusion is difficult for is contaminated.And microinfusion pump of the present invention realizes trace transfusion being easy to the controlling liquid input quantity easily, adopts electromagnet control device that electric magnet 49 is controlled, and can accurately control amount of infusion, the automaticity height.The present invention can be used with the disposable transfusion device that hospital uses always, does not need special special hose, the cheap and acquisition easily of consumptive material.

Although the present invention describes with reference to specific embodiment, this description and not meaning that is construed as limiting the present invention.With reference to description of the invention, other distortion of the disclosed embodiments all can be expected for those skilled in the art.

Claims

1. microinfusion pump, it comprises infusion tube, it is characterized in that this microinfusion pump also comprises iron plate, the input spring, the input button, extrusion spring, squeeze buttons, the outfan spring, outfan press device and electromagnet control device, extrusion spring is between input spring and outfan spring, the input button, squeeze buttons and outfan press device are connected to the input spring, extrusion spring and outfan spring one end, input spring and extrusion spring are installed on the iron plate, and between iron plate and infusion tube, the length of input spring is bigger than extrusion spring, the outfan press device is pushed infusion tube, with the outfan sealing of infusion tube, electromagnet control device comprises that one is used to control the electric magnet that iron plate moves; This microinfusion pump also comprises a substrate, the outfan spring is installed on the substrate, and this outfan press device comprises that one has the fixture block on an inclined-plane, and it is connected with the outfan spring, the outfan spring promotes fixture block extruding infusion tube, and the outfan of infusion tube is sealed.

2. the described microinfusion pump of root a tree name claim 1, it is characterized in that, this electromagnet control device also comprises the energising of importing electric magnet, the input equipment of power-off time and each extruding liquid output amount, encoder with the input signal coding, the memory of the coding of storage encoder, quartz crystal oscillator, be used for from the frequency divider of quartz crystal oscillator frequency division time, enumerator and comparator, this enumerator is used to count the outage and the conduction time of electric magnet, and comparator is used for when the default power-off time of the power-off time of relatively enumerator timing and memory equates sending power-off signal to electric magnet in conduction time of comparison enumerator timing and memory when electric magnet sends power on signal or equate default conduction time of storing.

3. the described microinfusion pump of root a tree name claim 2, it is characterized in that, this electromagnet control device also comprises encoder and display device, enumerator also is used for the count cycle number of times cycle-index and each extruding liquid output amount of presetting is multiplied each other, the amount of liquid of exporting infusion is shown in display device to decoder through decoding.

4. microinfusion pump, it comprises infusion tube, it is characterized in that this microinfusion pump also comprises iron plate, the input spring, the input button, extrusion spring, squeeze buttons, the outfan spring, outfan press device and electromagnet control device, extrusion spring is between input spring and outfan spring, the input button, squeeze buttons and outfan press device are connected to the input spring, extrusion spring and outfan spring one end, input spring and extrusion spring are installed on the iron plate, and between iron plate and infusion tube, the length of input spring is bigger than extrusion spring, the outfan press device is pushed infusion tube, with the outfan sealing of infusion tube, electromagnet control device comprises that one is used to control the electric magnet that iron plate moves; This outfan press device comprises clip, and clip clamps sealing by self elastic force with the outfan of infusion tube, and outfan spring one end is installed on iron plate, and the other end is connected with clip.

5. the described microinfusion pump of root a tree name claim 4, it is characterized in that, this electromagnet control device also comprises the energising of importing electric magnet, the input equipment of power-off time and each extruding liquid output amount, encoder with the input signal coding, the memory of the coding of storage encoder, quartz crystal oscillator, be used for from the frequency divider of quartz crystal oscillator frequency division time, enumerator and comparator, this enumerator is used to count the outage and the conduction time of electric magnet, and comparator is used for when the default power-off time of the power-off time of relatively enumerator timing and memory equates sending power-off signal to electric magnet in conduction time of comparison enumerator timing and memory when electric magnet sends power on signal or equate default conduction time of storing.

6. the described microinfusion pump of root a tree name claim 5, it is characterized in that, this electromagnet control device also comprises encoder and display device, enumerator also is used for the count cycle number of times cycle-index and each extruding liquid output amount of presetting is multiplied each other, the amount of liquid of exporting infusion is shown in display device to decoder through decoding.