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MicroRint > CAT NO: MR5000


Micro Medical’s unique design has taken a hitherto specialised measurement out of the pulmonary function laboratory and into the clinic or home. MicroRint enables airway resistance to be measured with the same ease as peak flow but without effort or technique from the patient. The subject simply breathes passively through a mouthpiece or face mask. A rapidly occluding valve automatically interrupts the airway for a period so brief as to be imperceptible to the patient.

The airway resistance result is automatically computed and displayed. The whole procedure takes only a few minutes and can be performed on all age ranges from neonates to adults. With the transducer weighing only 350g, the instrument is palm sized, easy to use and comes complete with all accessories in a sturdy carrying case.

The Problem

Wheeziness is a common problem in pre-school children. Objective assessment of this is difficult because such children cannot usually co-operate with conventional test of pulmonary function such as peak expiratory flow (PEF), or spirometry (FEV1 — FVC). This has hindered both the diagnosis of respiratory tract conditions and assessment of the response to therapy.

The Solution

Airway resistance is determined by the calibre of the airways, the same factor which determines PEF. Airway resistance may be determined by momentary interruption of the airflow. During interruption alveolar pressure equilibrates with airway pressure allowing airway resistance (Rint) to be determined from airway pressure immediately after interruption and flow(Q) immediately before interruption (Rint — pressure/flow).

Features

• Lightweight and portable, operating from internal rechargeable batteries.
• Rapid, non-invasive inspiratory and expiratory measurements.
• An alternative to Spirometry for pre-school age children.
• Hand-held design with PC connection and upload software included.
• Well tolerated by neonates and geriatric patients.
• Fully configurable features menu.
• Pre and post medication comparisons with predicted values.
• Results printed directly to a Hewlett Packard bubble-jet printer.

  • Specification


    Storage Capacity:

    Printer compatibility:


    Predicted values:

    Display:

    Transducer type:

    Pressure:

    Resolution:

    Flow range:

    Power supply:


    Battery Pack:


    Dimensions:


    Weight:
  • 1024 tests

    Hewlett Packard bubble jet printer
    [adaptor needed - Cat. No MLA 350]

    Percent predicted and normal range reported

    Graphic LCD 128 x 64 dots

    Flow: Pneumotachometer

    Piezo resistive

    0.01 l/s

    0 to 2 l/s

    Either primary 230V AC 50 Hertz secondary 9V DC 300mA or primary 120V AC 60 Hertz secondary 9V DC 300mA

    Micro controller unit: Rechargeable NiCad 7.2V 220mA hours
    Transducer: Rechargeable NiCad 6V 220mA hours

    Micro controller unit 274 x 134 x 36mm
    Transducer: 160 x 65 x 40mm

    1kg, 2.75kg with carrycase and accessories


Biblography


1. Isobel Dundas and Sheila McKenzie: Measurement of lung function in preschool children. Airways J 2003; 1:30-3

2. Bridge PD, Ranganathan S, McKenzie SA: Measurement of airway resistance using the interrupter technique in pre-school children in the ambulatory setting. European Respiratory Journal, 1999; 13, 1—52

3. Kannisto S,Vanninen E, Remes K and Korppi M: Interrupter technique for evaluation of exercise-inducedbronchospasm in children. Pediatric Pulmonology, vol. 27, Number 3, March 1999; 203—207

4. Phagoo SB, Wilson NM, Silverman M: Evaluation of a new interrupter device for measuring bronchial responsiveness and the response to bronchodilator in 3 year old children. European Respiratory Journal, 1996; 9, 1374—1380

5. Bridge PD, Lee H, M Silverman: A portable device based on the interrupter technique to measure bronchodilator response in schoolchildren. European Respiratory Journal, 1996; 9, 1368—13735

6. Chowienczyk PJ, Lawson CP, Lane S et al. A flow interruption device for the measurement of airway resistance. European Respiratory Journal, 1991; 4, 623—628

7. Enrico Lombardi MD, Elio Novembre, MD and Alberto Vierucci MD; Pediatric Allergy and Pulmonology Center, Anna Meyer Children's Hospital, University of Florence, Italy


Please note: This product is not yet approved for sale in the USA

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