CN2233256Y

CN2233256Y - Intelligent ultrafiltration monitor

Info

Publication number: CN2233256Y
Application number: CN 95209562
Authority: CN
Inventors: 张铁英
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-05-03
Filing date: 1995-05-03
Publication date: 1996-08-21
Anticipated expiration: 2005-05-03

Abstract

The utility model relates to an intelligent ultrafiltration monitor, which is composed of following components: a first differential pressure detection circuit which is composed of a differential pressure transducer 1, an amplifying circuit 2, a conversion keeping circuit 3 and an integral A/D 4 and measures the flow difference on the coming path of dialysis fluid, and a second differential pressure detection circuit which is composed of a differential pressure transducer 5, an amplifying circuit 6, a conversion keeping circuit 7 and an integral A/D 8 and measures the flow difference on the loop of the dialysis fluid; the differential pressure transducers 1 and 2 are respectively connected to two differential pressure sensing connectors out of a main body 16. The intelligent ultrafiltration monitor also comprises a computer system composed of a clock 9, a computer 10, a display 11, a display 12 and a display 13, wherein, the computer 10 carries out circuit processing to two-way measured flow difference signals and obtains ultrafiltration cumulant; the ultrafiltration cumulant is sent to the display 13 for displaying. A control part is composed of a relay 14 and a motor 15.

Description

Intelligence ultrafiltration monitor

This utility model is about a kind of medical industry that is applicable to, matching used with various Medical Instruments (as hemo system etc.), as to be used to measure the fluid flow difference a kind of intelligent measuring control instrument.

At present, China has more than 10,000 of the hemo system of various models, almost is the import hemo system entirely, and wherein majority is manually to adjust negative pressure to carry out ultrafiltration, promptly under the effect of negative pressure water unnecessary in the uremic patient body is taken off through dialyser.Ultrafiltration also is referred to as dehydration.The factor that influences ultrafiltration volume has: negative pressure, sound pulse pressure, dialyser area etc.Conventional hemo system, to determine corresponding negative pressure through calculating to the ultrafiltration volume that different patients are different, because it is many to influence the factor of ultrafiltration volume, ultrafiltration volume is difficult to grasp accurately, thereby influence dialysis-effect, this is the thing that patient and machine user are unsatisfied with and have no way, and how a process has been found ultrafiltration or be few if dialysis is over, and is also late.

Therefore, the purpose of this utility model provides a kind of matching used intelligent ultrafiltration monitor of conventional hemo system that is.It can be supervised actual ultrafiltration volume and show and control, so that it meets predetermined ultrafiltration volume.

According to intelligent ultrafiltration monitor of the present utility model, it is by forming as lower member: constitute the first differential pressure testing circuit by differential pressure pick-up, amplifying circuit, conversion maintenance and integration A/D, it measures the difference in flow on the dialysis solution incoming road; Constitute the second differential pressure testing circuit by differential pressure pick-up, amplifying circuit, conversion maintenance and integration A/D, it measures the difference in flow on the dialysis fluid circuit; Two differential pressure pick-ups are connected on two differential pressure sensing adapters of main body outside; By the computer system that clock, computer, display, three display and display constitute, computer carries out processing of circuit to the two-way difference in flow signal that records, and draws the ultrafiltration cumulant, and send display to show this ultrafiltration cumulant; Relay and motor constitute control section.

Said computer adopts 8031 microprocessors, and has increased watchdog system in software.

Fig. 1 is the outside drawing of this utility model intelligence ultrafiltration monitor.

Fig. 2 is the circuit block diagram of this utility model intelligence ultrafiltration monitor.

Fig. 3 is the structural representation of differential pressure sensing adapter in this utility model intelligence ultrafiltration monitor.

Fig. 4 is the concrete layout of amplifying circuit among Fig. 2.

Fig. 5 is conversion retaining part and an integration A/D concrete layout partly among Fig. 2.

Fig. 6 is the software flow pattern of this utility model intelligence ultrafiltration monitor.

Referring to Fig. 1 and Fig. 2, intelligent ultrafiltration monitor of the present utility model composed as follows: differential pressure pick-up 1, amplifying circuit 2, conversion keep 3 and integration A/D4 constitute the first differential pressure testing circuit, it measures the difference in flow on the dialysis solution incoming road, differential pressure pick-up 1 becomes analog voltage signal with the difference in flow on this dialysis solution incoming road, 2 pairs of these aanalogvoltage letters of amplifying circuit amplify, after handling by conversion maintenance 3 and integration A/D4 then, become digital signal, deliver to computer system (9,10,11,12,13).Differential pressure pick-up 5, amplifying circuit 6, conversion maintenance 7 and integration A/D8 constitute the second differential pressure testing circuit, it measures the difference in flow on the dialysis fluid circuit, differential pressure pick-up 2 becomes analog voltage signal with the difference in flow on this dialysis fluid circuit, 6 pairs of these aanalogvoltage letters of amplifying circuit amplify, after handling by conversion maintenance 7 and integration A/D8 then, become digital signal, deliver to computer system (9,10,11,12,13).Differential pressure pick-

up

1 and 2 is connected on two differential pressure sensing adapters (referring to Fig. 3) of main body 16 outsides.Computer system is made of clock 9, computer 10, display 11, display 12 and display 13.The two-way difference in flow signal that 10 pairs in computer records carries out processing of circuit (referring to flow chart shown in Figure 6), promptly draws the ultrafiltration cumulant, and send display 13 to show this ultrafiltration cumulant.Intelligent ultrafiltration monitor of the present utility model can show and set that ultrafiltration time and ultrafiltration scheduled volume show respectively to ultrafiltration time and ultrafiltration on display 11,12.

Display

11,12,13 all adopts the LED charactron, and they all are arranged on the front panel of main body 16 (as shown in Figure 1).Relay 14 and motor 15 constitute control section.In countdown, display 13 shows actual ultrafiltration volume, when the actual ultrafiltration volume of certain reason is less than in the unit interval or during more than predetermined ultrafiltration volume, computer control relay 14, make it to connect, increase or reduce negative pressure with control (stepping) motor forward or reverse, so that actual ultrafiltration volume meets predetermined ultrafiltration volume.

Fig. 3 shows two differential pressures and passes the concrete structure of containing adapter 21,22.Wherein 23,24,25 and 26 is the differential pressure pick-up union joint, and

union joint

23,24 usefulness sebific ducts are connected with differential pressure pick-up 1 shown in Figure 2, and

union joint

25,26 usefulness sebific ducts are connected with differential pressure pick-up 5 shown in Figure 2.Dotted portion is a metering hole, and it makes between the

union joint

23 and 24,25 and 26, and to produce slight pressure poor, and this slight pressure difference is picked up by differential pressure pick-up.27,28 is dialysis solution incoming road path; 29,30 is the dialysis fluid circuit path.Unnecessary moisture content enters in the dialysis solution of loop in the uremic patient blood vessel that dialyser ultrafiltration (dehydration) goes out.This adapter is connected with interface on the main body 16.

The little differential pressure sensor that above-mentioned differential pressure pick-up adopts ICSenor company to produce.Fig. 4 shows the amplifying circuit that differential pressure signal is amplified, and amplifying circuit 2 is the same with 6 structure, and wherein terminal JP1 connects differential pressure and passes device, and AD1 is a lead-out terminal, and conversion maintenance shown in Figure 5 and integration A/D part are delivered in its output.Computer 10 adopts 8031 general microprocessors.Carry out the computing of root side, subtraction, integral operation at 8031 microprocessor internals successively by software, signal further is converted to flow signal, difference in flow signal and flow accumulation amount difference signal successively, and shows flow accumulation amount difference signal (being the ultrafiltration cumulant).Drive motor by software according to the difference in flow signal control relay simultaneously and adjust negative pressure.

Software flow to native system describes below.Referring to Fig. 6, when step 2 is power-on self-test, initialization, increased Watching DOG (house dog) system, to improve the feasibility of CPU.At third step, by Keyboard Control, can carry out Zero calibration, the demarcation of working to the last minute, time be provided with and total throughflow difference setting.After above-mentioned demarcation and setting were finished, in the 4th step, computer began sampling.Signal with sampling carries out digital filtering processing and saving result then, is scheduled to total throughflow difference demonstration, actual total throughflow difference demonstration and time showing then.

The utlity model has that function is complete, reliability is high, antijamming capability is strong, long service life, The characteristics such as easy and simple to handle.

Claims

1, a kind of intelligent ultrafiltration monitor is characterized in that it is by forming as lower member: constitute the first differential pressure testing circuit by differential pressure pick-up 1, amplifying circuit 2, conversion maintenance 3 and integration A/D4, its measures the difference in flow on dialysis solution incoming road; Constitute the second differential pressure testing circuit by differential pressure pick-up 5, amplifying circuit 6, conversion maintenance 7 and integration A/D8, its measures the difference in flow on dialysis fluid circuit, and differential pressure pick-up 1 and 2 is connected on two differential pressure sensing adapters of main body 16 outsides; By the computer system that clock 9, computer 10, display 11, display 12 and display 13 constitute, the two-way difference in flow signal that 10 pairs in computer records carries out processing of circuit, draws the ultrafiltration cumulant, and send display 13 to show this ultrafiltration cumulant; Relay 14 and motor 15 constitute control section.

2, according to the intelligent ultrafiltration monitor of claim 1, it is characterized in that: said computer 10 adopts 8031 microprocessors, and has increased watchdog system in software.