NIDHI-Flow-814 is a fully automatic microprocessor based device with digitally controlled wight based flow transducer. It is designed to monitor the urinary volume and flow rate within a urine collection beaker during micturation. NIDHI-Flow-814 system is quite expedient for very practical day to day flow study.

When the micturation process starts, a volume change is sensed by the microprocessor based device automatically, which determines and stores urinary volume, flow rate and time alongwith other parameters. At the end of micturation process the microprocessor based device programmed to determine parameters relating to urinary flow like voided volume, voiding time, flow time, maximum flow rate, average flow rate and time to maximum flow. It also provides the graphical flow curve of the micturation process by the means of flow rate v/s time. At the end of micturation process, by automatic preset delay, it gives a printout which consists of a graphical flow curve as well as statistics relating to parameters of urinary flow altogether with the patients information.

The urinary system consists of two kidneys, two ureters, bladder and urethra. The kidneys principally function to filter the waste products from the blood and circulate the cleaned blood in the body. The ureters carry the waste products (urine) from the kidneys to the bladder. In the bladder, the urine is stored until urination. Thereafter, the urine passes out of the bladder through urethra.

Prostate is a accessory sex gland found in men at the base of the urinary bladder and surrounds the urethra. As the men age, the prostate gland slowly enlarge (called BPH) and may press on the urethra and cause flow of urine to be slower and less forceful with some other adverse symptoms. BPH is diagnosed with the help of ultra sound examination of urinary system and uroflowmetry.

Uroflowmetry is one way of integrating the activity of the bladder and the outlet during the emptying phase of micturation. The micturation process consists of detrusor function of bladder neck opening and urethral conductivity. It can establish the type of abnormality and filter the patients who require further invasive procedures. Thus, it avoids under treatment in the younger age group & restricts overzealous invasive procedure in the older age group.


NIDHI Flow-814 is fully automatic microprocessor based device with digitally controlled weight base flow transducer. The use of dot-matrix printer (Instead of conventional thermal printer) and weight based flow sensor making the device user-friendly and most economical.

The unit is having following essential standard accessories to arrive upon the accurate data of routine flow study :

Add-on Module

This is the highly precise advance microprocessor based device providing the statistics of urine flow parameters and also determines the graphical curve of flow rate v/s time. It also facilitates the system to provide auto start, auto print and auto stop functions.

One of the key features is that if the urination period goes above 50 seconds, the time scale is automatically compressed. Thereby the system records the data relating to urination time; to the extent of three minutes.


It is a more reliable and cost effective weight base, digitally controlled flow transducer. Its inherent characteristics such as easy placement of collection beaker for flow study and easy maintainability makes the transducer more durable.

Micturation Chair & Funnel

The handy micturation chair with back rest and arms is designed in such a way that it avoids the patient’s psychological discomfort to obtain habitual pattern of micturation during flow measurement.

Urine Collection Beakerurine Collection Beaker

The duly calibrated urine collection beaker is made of special grade, transparent plastic which can be placed easily below the micturation chair. This urine collection beaker is reusable and having capacity of 2000 ml. (max.).


Technical Specification

Line Voltage80 V-230V AC Stabilized
Line Frequency50 Hz
Dimensions (only uroflow module)292 mm x 210 mm x 110 mm (L x b x h )
Repeat CopySelectable in two modes - 5ml / 10ml per sec.
Accuracy±5% of voided volume in reading
±2% of voided volume at full range
Maximum Capacity for a single micturation2000 ml.
Maximum peak flow rate detectable50 ml/sec.
Maximum micturation timesNormal : 50 seconds
Extended : 300 seconds
Maximum detectable "Time to Max Flow"1 second
Parameters MeasuredVoided volume, voiding time, flow time, max. flow rate, time to max. flow, avg. flow rate and hesitancy
Standard AccessoriesAdvance Microprocessor based Ad-On module, Transducer, Micturation chair with back rest and arms, Urine collection beaker and EPSON Compatible Dot matrix Printer
PrinterSupports to WIPRO/EPSON Compatible Dot matrix printer
Note : The flow trace printout normally starts 2mm from the graph left hand side to show the starting point. The time equivalent to this is not included in the derived values printed out.

Parameter Measured

In order to avoid uneven measurements during every process of uroflowmetry the unit (of the transducer) is required to be calibrated on 2000 ml. calibration system prescribed by us is easy and as such user’s friendly. It resumes better accuracy + 1% voided volume and external elements do not affect the system weightage during the process.

Voided Volume
The reproducibility and reliability of the maximum flow rate is best with voided volumes between 200 ml & 400 ml. A reduced flow rate obtained at volumes smaller than 100 to 150 is unreliable in unobstructed cases the maximum flow rate will rise proportionally to the square root of the voided volume up to a volume determined by the bladder capacity.

Flow Time & Voiding Time
In case with intermittent flow the voiding time & flow time will be different Post voiding dribble is often a non-pathological condition may be due to emptying of the urethra of urine by contraction of the bulb cavernous muscle or by manual procedures.

Average Flow Rate
Average flow rate is the voided volume divided by flow time.

Maximum Flow Rate
The maximum flow rate is the most important single parameter in Uroflowmetry but interpretation of maximum flow rate values requires familiarity with the flow curve pattern the voided volume age and sex. In male patients a maximum flow rate exceeding 15 ml/sec. indicates normal bladder and urethral function [90 to 95 %] and maximum flow rate below 10ml/sec. are suggestive of intra-vesicle obstruction [90 to 95 %].

Yearsml/sec. MalesFemales
04-07 1001010
8-13 1001215
14-45 2002118
46-55 2002215
56-80 2000910


The maximum flow rate normally changes with age and young men in particular may be virtually obstructed with maximum flow rate about 15 ml/sec. so calls high flow high pressure intra-vesicle obstruction. In females 20ml/sec. is traditionally the arbitrary lower limit exists but in decreased urethral resistance due to bladder base insufficiency, extremely high flow rates may be encountered.

Delay Time (Hesitancy)
Delay time is the time interval between the existence of considerable urge to urinate & the beginning of the actual voiding. Delay time is usually less than 10 seconds in cases of intra-vesicle obstruction or in cases of psychological inhibition the delay time may be longer.