BIOCIRCUITS IOS (IN-OFFICE SYSTEM)

K952719 · Biocircuits Corp. · KHO · Nov 22, 1995 · Clinical Chemistry

Device Facts

Record IDK952719
Device NameBIOCIRCUITS IOS (IN-OFFICE SYSTEM)
ApplicantBiocircuits Corp.
Product CodeKHO · Clinical Chemistry
Decision DateNov 22, 1995
DecisionSESE
Submission TypeTraditional
Regulation21 CFR 862.2560
Device ClassClass 1

Indications for Use

The IOS™ system is intended for use with specific IOS™ test cartridges in clinical laboratories, physicians' office laboratories, and other alternate sites to perform immunoassay testing close to the point of patient care.

Device Story

Biocircuits IOS™ is a point-of-care fluorometer for clinical immunoassay testing. System components include the instrument, buffer kits, quality control cartridge, sample pipette, and software card. Operation: user inserts test cartridge; instrument reads barcoded analyte info/calibration; user adds serum sample. Instrument uses syringe pump for buffer, waste pump for fluidics, and motor-driven magnet to spin cartridge impellers. Optics (mercury vapor lamp, photomultiplier) measure fluorescent signal. Microprocessor calculates analyte concentration from fluorescence readings. Output: results displayed on LCD and printed. Used in clinical/physician office labs to provide rapid, automated immunoassay results, aiding clinical decision-making by enabling immediate diagnostic testing.

Clinical Evidence

Bench testing and clinical comparison studies performed. Accuracy evaluated against fluorescent enzyme immunoassay using 126 samples (T4, TU, FTI); correlation coefficients (r) ranged 0.703–0.937. Precision studies (within-day, between-day, total) conducted at manufacturer site. Clinical validation at a physician's office laboratory (n=43) compared IOS™ results to the predicate device; correlation coefficients (r) for T4, TU, and FTI were 0.919, 0.821, and 0.927 respectively. Total imprecision (% CV) reported for various control levels.

Technological Characteristics

Front-surface fluorometer; mercury vapor lamp excitation (365 nm); photomultiplier detector (440 nm emission). Components: syringe pump, waste pump, motor-driven magnet for cartridge impellers, bar code reader, LCD interface, keypad. Connectivity: software card-based updates. Operating environment: 15°-30°C. Microprocessor-based data analysis.

Indications for Use

Indicated for use in clinical laboratories, physicians' office laboratories, and alternate sites for performing immunoassay testing (e.g., T4, T-Uptake, FTI) on serum samples.

Regulatory Classification

Identification

A fluorometer for clinical use is a device intended to measure by fluorescence certain analytes. Fluorescence is the property of certain substances of radiating, when illuminated, a light of a different wavelength. This device is used in conjunction with certain materials to measure a variety of analytes.

Predicate Devices

Submission Summary (Full Text)

{0} K-1-2717 10-22 1995 # 510(k) Summary of Information Respecting Safety and Effectiveness A. Submitter: Biocircuits Corporation 1324 Chesapeake Terrace Sunnyvale, CA 94089 (408) 745-1961 Contact: Sheila Ramerman Date Prepared: November 14, 1995 B. Device Names: Proprietary Name: Biocircuits IOS™ (In-Office System) Common Name: Fluorometer for clinical use Classification Name: Fluorometer for clinical use C Legally Marketed Device: The IOS™ system is substantially equivalent to the Dade Stratus II immunoassay analyzer, (K890908). D. Device Description: The IOS™ system consists of the IOS™ instrument, a Buffer Start-up Kit, a Buffer Kit, the IOS™ Quality Control Cartridge (IOSQC), the IOS™ Sample Pipette, and an IOS™ Software Card. The system performs immunoassay tests close to the point of patient care. The system provides rapid, reliable, and accurate results with minimal user involvement. It performs checks of both the instrument and reagent components every time a testis run. The Biocircuits IOS™ instrument reads the test information - the analyte that is being run, its calibration coefficients, the lot number and expiration ate from the bar code on the 10S Test Cartridge and then asks the user to add a patient sample. When appropriate, the instrument adds buffer solution to the test cartridge to dilute sample, to rehydrate the dried reagents and to wash out excess sample and reagents. The easy-to-read multi-line liquid crystal display (LCD) guides the user through each step of the Biocircuits IOS™ operation. The user enters instructions and data via the keypad. The Biocircuits IOS™ instrument is configured with: - a syringe pump for dispensing buffer - a bar code reader - optics that read the fluorescent signal - a waste pump for clearing excess fluid from the test cartridge - a magnet attached to a motor for spinning the impellers in the cartridge - a microprocessor that calculates analyte concentration from the fluorescence readings - a buffer compartment that holds the buffer and waste bottles - a software card containing the latest version of the software that runs the Biocircuits IOS™ E. Intended Use: The IOS™ system is intended for use with specific IOS™ test cartridges in clinical laboratories, physicians' office laboratories, and other alternate sites to perform immunoassay testing close to the point of patient care. F. Comparison] with the Predicate Device: Table 1 summarizes the comparative features of both the IOS™ and the Stratus II instruments. {1} ### G. Performance Data: Nonclinical testing performed at the manufacturer's laboratories gave the following results: Accuracy: A comparison of methods obtained by testing 126 patient samples in the manufacturer's laboratories using the 10S T4/TU cartridges and a commercially available fluorescent enzyme immunoassay gave the following results, in the form y = b +mx, with "r" being the correlation coefficient. The samples tested ranged from 1.8 ug/dL to 24.6 ug/dL T4. | T4: | y =0.229+ 0.943x, r = 0.937 | | --- | --- | | TU: | y = 7.120+ 0.748x, r = 0.703 | | FTI: | y = -0.037+ 0.959x, r = 0.932 | Precision: The following results were obtained from a laboratory study performed at the manufacture for within-day, between-day, and total imprecision: | T4 | | | | | --- | --- | --- | --- | | Control Level | 1 | 2 | 3 | | Mean (ug/dL) | 8.1 | 12.9 | 4.65 | | SD, overall (ug/dL) | 0.72 | 1.14 | 0.56 | | % CV, within-day (n=10) | 8.5% | 8.8% | 14.4% | | % CV, between-day (n=40) | 5.0% | 4.4% | 6.9% | | % CV, total | 8.9% | 8.8% | 12.1% | | T-Uptake | | | | | --- | --- | --- | --- | | Control Level | 1 | 2 | 3 | | Mean (% uptake) | 32.4 | 39.7 | 22.82 | | SD, overall (% uptake) | 1.04 | 0.93 | 1.78 | | % CV, within-day (n=10) | 2.9% | 2.4% | 3.8% | | % CV, between-day (n=40) | 2.0% | 1.1% | 5.9% | | % CV, total | 3.2% | 2.3% | 7.8% | Clinical testing performed at a typical physician's office laboratory gave the following results: Accuracy: A comparison of methods using a total of 43 patient samples was performed using IOS™ T4/TU cartridges; the samples were split and sent to the manufacturer's laboratory for retesting on both the IOS™ and on the predicate device. These studies gave the following results, in the form y = b + mx, with "r" being the correlation coefficient. The samples tested ranged from 1.8 ug/dL to 20.6 ug/dL T4. | T4: | y = 1.915+ 0.771x, r = 0.919 | | --- | --- | | TU: | y = 3.470+ 0.878x, r = 0.821 | | FTI: | y = 1.814+ 0.775x, r = 0.927 | Precision [lie following results were obtained from a study to determine total imprecision: | T4 | | | | | --- | --- | --- | --- | | Control Level | 1 | 2 | 3 | | Mean (ug/dL) | 7.46 | 11.75 | 4.79 | | SD, overall (ug/dL) | 0.75 | 1.40 | 1.01 | | % C", total | 10.1% | 11.9% | 21.2% | | T-Uptake | | | | | Control Level | 1 | 2 | 3 | | Mean (% uptake) | 32.24 | 39.63 | 24.54 | | SD, overall (% uptake) | 1.46 | 1.06 | 2.93 | | % C", total | 4.5% | 2.7% | 12.0% | It is self-evident from the data and information presented here that the IOS™ system is as safe and as effective, and performs as well as, the predicate device. Attachment: Table I: Instrument Comparison {2} # TABLE 1 DADE STRATUS II vs. BIOCIRCUITS IOS™ Instrument Comparison | ATTRIBUTE | STRATUS II | IOS | | --- | --- | --- | | Technology | Front surface fluorometry | Front surface fluorometry | | Reagents | | | | Immobilization Medium | Reaction tab | Plastic cartridge | | Dry | Antibody only | Antibody, substrate, other assay-specific reagents as needed | | Wet | 2 or 3 (depending on assay), loaded by operator at start of each assay | 1 (same for all assays), continuously on-board | | Delivery | Fully automated | Fully automated | | Short Reagent Detect | Yes | Yes | | Calibration | By user | At factory | | Sample | | | | Type | Serum or plasma | Serum | | Volume | 0.2 ml | 0.033 ml | | Short Sample Detect | Yes | Yes | | Optics | | | | Type | Fluorometer | Fluorometer | | Detector | Photomultiplier | Photomultiplier | | Light Source | Low pressure mercury lamp | Mercury vapor lamp | | Excitation Wavelength | 365 nm | 365 nm | | Emission Wavelength | 450 nm | 440 nm | | Quality Control | Liquid, assay-specific, tested each run | Electronic/instrument, tested each day Liquid, assay-specific, tested once/week | | Instrument Calibration | One fluorescent standard on instrument, read prior to each run | Two fluorescent standards on instrument, read prior to each test | | Operating environment | 22°-320 C | 15°-300 C | | Data analysis | Microprocessor-controlled Stored standard curves | Microprocessor-controlled Stored standard curves | | Data output | LCD display Printed alphanumeric hard copy | LCD display Printed alphanumeric hard copy |
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