MULTIPLATE 5.0 AGGREGOMETER

K103555 · Verum Diagnostica GmbH · JOZ · Jul 27, 2012 · Hematology

Device Facts

• Record ID: K103555
• Device Name: MULTIPLATE 5.0 AGGREGOMETER
• Applicant: Verum Diagnostica GmbH
• Product Code: JOZ · Hematology
• Decision Date: Jul 27, 2012
• Decision: SESE
• Submission Type: Traditional
• Regulation: 21 CFR 864.5700
• Device Class: Class 2

Indications for Use

The Multiplate 5.0 aggregometer is intended for in vitro use to measure platelet aggregation in response to Arachidonic acid or ADP in citrated whole blood samples for the qualitative assessment of platelet function. The ADPtest reagent is a lyophilized preparation of adenosine-5-diphosphate for in vitro diagnostic use to measure platelet aggregation for the qualitative assessment of platelet function. For professional laboratory use only. The ASPItest reagent is a lyophilized preparation of arachidonic acid (AA) for in vitro diagnostic use to measure platelet aggregation for the qualitative assessment of platelet function. For professional laboratory use only. For use as an assayed quality control verification of the resistance measure of impedance aggregometry.

Device Story

Multiplate 5.0 is an automated whole blood analyzer for platelet function assessment. It utilizes disposable test cells containing multiple electrodes; electrical impedance sensing principle. When whole blood is introduced, platelets adhere to electrodes; agonist-induced aggregation increases electrical resistance (impedance) between electrode pairs. System features five independent channels; dual sensor technology records two measurements per test cell; reports mean value in Units (U) representing area under the curve of resistance change. Operated by laboratory professionals in clinical settings. Integrated computer system with software manages data collection; output assists clinicians in evaluating platelet function. Benefits include standardized, objective assessment of platelet aggregation compared to traditional methods.

Clinical Evidence

Multi-center study of 171 patients suspected of decreased platelet function. Performance compared to predicate. ASPItest: 100% PPA, 65% NPA. ADPtest: 93% PPA, 54% NPA. Sensitivity/specificity analysis (n=91) against physician-reviewed clinical history: ASPItest sensitivity 93%, specificity 67%; ADPtest sensitivity 59%, specificity 80%.

Technological Characteristics

Electrical impedance-based platelet aggregometer. 5-channel system with integrated computer, screen, keyboard, mouse, and electronic pipette. Reagents: lyophilized ADP and Arachidonic acid. Controls: liquid-based, ionic strength-verified. Software-driven data acquisition and curve plotting. Dimensions/form factor: benchtop instrument. Connectivity: standalone system with peripheral interfaces. Sterilization: not applicable (reagents/consumables).

Indications for Use

Indicated for qualitative assessment of platelet function in citrated whole blood samples from patients suspected of platelet dysfunction. For professional laboratory use only.

Regulatory Classification

Identification

An automated platelet aggregation system is a device used to determine changes in platelet shape and platelet aggregation following the addition of an aggregating reagent to a platelet-rich plasma.

Predicate Devices

• Chrono-log Model 700 Whole Blood Lumi-Aggregometer (K050265)

Submission Summary (Full Text)

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# 510(k) SUBSTANTIAL EQUIVALENCE DETERMINATION DECISION SUMMARY

A. 510(k) Number:
k103555

B. Purpose for Submission:
New submission

C. Measurand:
Platelet aggregation

D. Type of Test:
Platelet aggregometer assays: ADPtest (10 μM ADP) and ASPItest (0.5 mM Arachidonic Acid)

E. Applicant:
Verum Diagnostica GmbH

F. Proprietary and Established Names:
Multiplate 5.0 aggregometer
ADPtest
ASPItest

G. Regulatory Information:
1. Regulation section:
864.5700 – Automated Platelet Aggregation System
2. Classification:
Class II
3. Product code:

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JOZ System, Automated Platelet Aggregation

4. Panel:
Hematology (81)

H. Intended Use:

1. Intended use(s):
Instrument- The Multiplate 5.0 aggregometer is intended for in vitro use to measure platelet aggregation in response to Arachidonic acid or ADP in citrated whole blood samples for the qualitative assessment of platelet function.

Reagent- The ADPtest reagent is a lyophilized preparation of adenosine-5-diphosphate for in vitro diagnostic use to measure platelet aggregation for the qualitative assessment of platelet function. For professional laboratory use only.

Reagent- The ASPItest reagent is a lyophilized preparation of arachidonic acid (AA) for in vitro diagnostic use to measure platelet aggregation for the qualitative assessment of platelet function. For professional laboratory use only.

Controls- For use as an assayed quality control verification of the resistance measure of impedance aggregometry.

For Professional Use Only.

2. Indication(s) for use:
Same as intended use.

3. Special conditions for use statement(s):
For Prescription Use Only 120

4. Special instrument requirements:
The Multiplate 5.0 ASPItest (0.5 mM Arachidonic acid) and ADPtest (10 μM ADP) are to be run on the Verum Multiplate 5.0 whole blood aggregometer.

I. Device Description:
The Multiplate 5.0 aggregometer is a platelet aggregometer for the analysis of platelet function in whole blood. It provides a five channel aggregometer and an integrated computer system with associated software and is connected to a computer screen, keyboard, mouse, and an electronic pipette.

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Included with the aggregometer are reagents for ADP or Arachidonic acid assays (ADPtest or ASPItest reagents respectively). These reagents activate platelets through specific platelet membrane receptor/signal transduction pathways and are therefore, used for determination of platelet function or alterations in function.

## J. Substantial Equivalence Information:

1. Predicate device name(s):

Chrono-Log Whole Blood Lumi-Aggregometer

2. Predicate 510(k) number(s):

k050265

3. Comparison with predicate:

| Similarities | | |
| --- | --- | --- |
| Item | Device | Predicate k050265 |
| Intended Use | The Multiplate 5.0 aggregometer is intended for in vitro use to measure platelet aggregation in response to Arachidonic acid or ADP in citrated whole blood samples for the qualitative assessment of platelet function | For in-vitro diagnostic use for measuring platelet aggregation and ATP secretion in whole blood or platelet rich plasma. |
| Matrix | Citrated (3.2%) whole blood | Citrated (3.2 and 3.8%) whole blood and Platelet Rich Plasma |
| Test Method | Platelet aggregation | Same, predicate also measures ATP secretion |
| Principle of Operation | Electrical impedance | Same |
| Assay type | ADP or Arachidonic Acid | Same |
| Differences | | |
| --- | --- | --- |
| Item | Device | Predicate |
| Reported Units | Units (U) | Ohms (Ω) for whole blood
Percent (%) for PRP
Nanomole (nM) for ATP release |
| Method of Reporting | Software utilized for data management | Alternative reporting by connection to a strip chart recorder |

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| Differences | | |
| --- | --- | --- |
| Item | Device | Predicate |
| Number of Channels | 5 channels | 2 or 4 channels |
| Sensor units per channel | One per channel | Two per channel |
| Controls | Liquid control | None |

## K. Standard/Guidance Document Referenced (if applicable):

Format for Traditional and Abbreviated 510(k)s-Guidance for Industry and FDA Staff

510(k) Submissions for Coagulation Instruments- Guidance for Industry and FDA Staff

In Vitro Diagnostic Devices: Guidance for the Preparation of 510(k) Submissions

General Principles of Software Validation; Final Guidance for Industry and FDA Staff

Guidance for the Content of Premarket Submissions for Software Contained in Medical Devices- Guidance for Industry and FDA Staff

H58-A Platelet Function Testing by Aggregometry; Approved Guideline

## L. Test Principle:

The principle of measurement of the Multiplate device is electrical impedance. An electrical current passes through individual sets of electrodes. When the electrodes come into contact with a whole blood sample platelets bind to and cover the electrodes in a small monolayer. As the platelets become activated after exposure to a specific platelet agonist, the platelets strongly adhere to the electrodes and begin to aggregate. An increase in the number of platelets adhering to the electrodes increases the resistance (impedance) between the pair of electrodes. The Multiplate software plots these changes as a curve. The instrument transforms the measured signal into units (U), which are dependent on the change of resistance. The aggregation is plotted against the time and the area under the measuring curve is expressed as units (U).

## M. Performance Characteristics (if/when applicable):

1. Analytical performance:

a. Precision/Reproducibility:

Donor samples containing low (<34U for ADP and <32U for AA), medium

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(between 34 and 52U for ADP and between 32 and 48U for AA) and high (>52U for ADP and >48U for AA) platelet function levels were tested with three lots of reagents, using three different devices and two different operators. For each configuration, samples were measured in duplicate. The experiment was repeated for 10 days for high and medium platelet function level samples. Low platelet function samples were repeated for 5 days.

The percent positive and negative agreement for the ADPtest and ASPItest at low and high level platelet function samples was 100%. At medium platelet levels, the following observations were made:

**ADPtest**- The measurements for precision were performed with freshly drawn blood from donors, tested with three different lots of reagent, using three different devices, and two different operators. For each configuration two replicates were measured. The experiment was repeated for a minimum of five days with a new blood draw on each day. Samples from one donor each with high, medium, and low platelet function levels were tested. Agreement for the high and low platelet function level samples was 100% for device and lot variabilities. Lot-to-lot variability with medium platelet function levels around the cut-off determined a mean of 15.7 (15-17) for samples determined to have decreased platelet function level and 43.7 (43-45) for samples which exhibit normal platelet function. Comparably, the mean observations for the device variability study were 16.3 (11-24) for samples with decreased platelet function, and 43.7 (36-49) for normal samples. The repeatability study showed similar results as the reproducibility study.

**ASPItest**- The measurements for precision were performed with freshly drawn blood from donors, tested with three different lots of reagents, using three different devices, and two different operators. For each configuration two replicates were measured. The experiment was repeated for a minimum of five days with a new blood draw on each day. Samples from one donor each with at high, medium, and low platelet function levels were tested. Agreement for the high and low platelet function level samples was 100% for device and lot variabilities. Lot-to-lot variability with medium platelet function levels around the cut-off determined a mean of 28 (23-34) for samples determined to have decreased platelet function level and 32 (26-37) for samples which exhibit normal platelet function. Likewise, the mean observations for device variability study were 28 (22-37) for samples with decreased platelet function, and 32 (23-38) for normal samples. The repeatability study showed similar results as the reproducibility study.

**b. Linearity/assay reportable range:**

Increasing concentrations of platelet function antagonists (Aspirin for the Arachidonic acid assay and Thienopyridine for the ADP assay) were added to blood samples from healthy donors prior to measurement. The linear range

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was determined by linear regression.

| Platelet agonist | Platelet antagonist | Linear Range |
| --- | --- | --- |
| Arachidonic acid | Aspirin | 20-61 U |
| ADP | P2Y12 receptor antagonist (Thienopyridine) | 25-56 U |

c. Traceability, Stability, Expected values (controls, calibrators, or methods):

Controls - The control material that is available for the Verum Multiplate 5.0 aggregometer consists of two liquids of different ionic strengths. The liquid quality control is an artificial quality control to ensure the quality of the electronic parts and sensors of the Multiplate system by evaluating the resistance measurement of the system. Because the controls are used for a functional test, they do not contain a specific analyte. Rather, mixing of the 2 controls at varying proportions provides two distinct levels of resistance that are representative of two distinct ranges or measurements on the Verum Multiplate system.

Expected Values - Value assignment for the liquid control material is performed by comparison testing at 11 sites for a total of 200 measurements per control, assessed as amplitude of the electrical signal produced by the control, expressed in Amplitude Units (AU). In accordance with CLSI guideline C28-A3c, a reference range is established using the inner $90\%$ confidence interval.

| Control Level 1 | |
| --- | --- |
| Lower Limit (AU) | 50.6721 |
| 90% CI (AU) | 48.7624-52.5418 |
| Upper Limit (AU) | 75.1331 |
| 90% CI (AU) | 73.1240-77.0471 |
| Control Level 2 | |
| Lower Limit (AU) | 101.2910 |
| 90% CI (AU) | 99.0841-103.3680 |
| Upper Limit (AU) | 142.8217 |
| 90% CI (AU) | 140.3830-145.2971 |

Results were rounded to the next full integer. Based on the CI limits, acceptable values for control measurements were set at 50-75 AU for level 1 and 100-140 AU for level 2. Each new lot of liquid control material is tested and must meet established performance values and pass accelerated stability testing.

Stability claims - Stability of the lyophilized reagents, frozen reagents, reconstituted reagents, controls and test cells was determined. The shelf life

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stability of the control material was established by performing accelerated and real-time stability studies. Expiration dates are assigned based on real time stability. All test passed the acceptance criteria of a mean difference of claimed stability time point and $t = 0$ of $\leq 12\%$ .

Reagent stability

| | Storage Condition | No. of samples at t=0 | No. of samples at t=claimed timepoint | Claimed stability |
| --- | --- | --- | --- | --- |
| Lyophilized ADPtest and ASPItest reagent | 2-8°C | 5 | 10 | 2 years |
| Frozen ADPtest and ASPItest reagent | -20°C | 10 | 10 | 4 weeks |
| Thawed ADPtest and ASPItest reagent | Room Temperature (RT) | 5 | 5 | 24 hours |

Salt solution stability

| | Storage Condition | No. of samples at t=0 | No. of samples at t=claimed timepoint | Claimed stability |
| --- | --- | --- | --- | --- |
| NaCl/CaCl2 | 2-8°C | 4 | 8 | 1 year |

Control stability

| | Storage Condition | No. of samples at t=0 | No. of samples at t=claimed timepoint | Claimed stability |
| --- | --- | --- | --- | --- |
| Shelf life- liquid controls | 2-8°C | 25 | 5 | 2 years |
| Open vial- liquid controls | RT | 25 | 5 | 24 hours |

Test cell stability

| | Storage Condition | No. of samples at t=0 | No. of samples at t=claimed timepoint | Claimed stability |
| --- | --- | --- | --- | --- |
| Shelf life-test cells | RT | 10 | 10 | 14 months |

d. Detection limit:

Not applicable

e. Analytical specificity:

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Not applicable

f. Assay cut-off:

260 healthy volunteers with no known bleeding disorders who reported to have abstained from intake of anti-platelet agents were tested with the Verum Multiplate 5.0 aggregometer Arachidonic acid and ADP assays in three centers. One measurement was omitted as outlier. The reference intervals were calculated as the inner 90% confidence interval. Results are summarized in the table below:

| Test | No. of Measurements | Mean (U) | Standard Deviation (U) | 5th Percentile (U) | 95th Percentile (U) | Reference Interval (U) |
| --- | --- | --- | --- | --- | --- | --- |
| Arachidonic acid (0.5mM) | 260 | 63.4 | 14.8 | 40 | 91 | 40-91 |
| ADP (10μM) | 259 | 67.1 | 14.3 | 43 | 92 | 43-92 |

The ranges for normal and abnormal platelet function are therefore defined as follows:

| Assay | Normal platelet function | Abnormal platelet function |
| --- | --- | --- |
| ADPtest | 43-92 U | < 43 U |
| ASPItest | 40-91 U | < 40 U |

2. Comparison studies:

a. Method comparison with predicate device:

Whole blood samples from adult patients suspected of platelet dysfunction were collected at one EU and two U.S. clinical sites. Samples were measured in singlicate using the Chrono-Log and Multiplate assay ADP and Arachidonic Acid assays. Using the previously determined cut-offs, samples were determined to have normal or abnormal platelet function. The positive and negative percent agreements of the Multiplate to its predicate Chrono-Log were calculated.

| Arachidonic Acid | Chrono-Log | | | |
| --- | --- | --- | --- | --- |
| | | Normal | Abnormal | Total |
| Multiplate | Normal | 91 | 28 | 119 |
| | Abnormal | 0 | 52 | 52 |
| | Total | 91 | 80 | 171 |

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| ADP | Chrono-Log | | | |
| --- | --- | --- | --- | --- |
| | | Normal | Abnormal | Total |
| Multiplate | Normal | 38 | 60 | 98 |
| | Abnormal | 3 | 70 | 73 |
| | Total | 41 | 130 | 171 |
| | Arachidonic Acid | | ADP | |
| --- | --- | --- | --- | --- |
| | Positive Percent Agreement | Negative Percent Agreement | Positive Percent Agreement | Negative Percent Agreement |
| Agreement | 100% | 65% | 93% | 54% |
| 95% Confidence Interval | [96%, 100%] | [54%, 75%] | [81%, 97%] | [45%, 62%] |

b. Matrix comparison:

Not applicable.

3. Clinical studies:

a. Clinical Sensitivity and Specificity:

The evaluation of the platelet function status (normal/abnormal) via the Multiplate 5.0 aggregometer was compared to the clinical assessment of a three member adjudication panel using the patient clinical history. To this end, 260 patients suspected of platelet dysfunction were tested at three clinical sites using the Verum Multiplate 5.0 or the predicate device using the ADP and Arachidonic Acid reagents. The presence of normal or abnormal platelet function was determined using the cut-off of $&lt;43\mathrm{U}$ for ADPtest and $&lt;40\mathrm{U}$ for ASPItest. Due to restricted access to patient data through the local IRB at one site, the patient history files (including laboratory results, clinical history, clinical procedures, demographic data, etc.) of 171 study patients were further assessed by 2 adjudicators for presence of abnormal platelet function based on the information in each subject's clinical history. In case of disagreement, a third panel member made the final determination. Patient sample histories were numbered sequentially and no identifiers allowed for patient identification or identification of the clinical testing site.

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| | Arachidonic Acid | | ADP | |
| --- | --- | --- | --- | --- |
| | Sensitivity | Specificity | Sensitivity | Specificity |
| Multiplate | 93% | 67% | 59% | 80% |
| 95% Confidence Interval | [85%, 97%] | [44%, 84%] | [46%, 70%] | [63%, 90%] |
| Predicate Device | 88% | 67% | 41% | 87% |
| 95% Confidence Interval | [78%, 93%] | [44%, 84%] | [30%, 54%] | [70%, 95%] |

c. Other clinical supportive data (when a. is not applicable):

Not applicable.

4. Clinical cut-off:

| Assay | Normal platelet function | Abnormal platelet function |
| --- | --- | --- |
| ADPtest | 43-92 U | < 43 U |
| ASPItest | 40-91 U | < 40 U |

Expected values/Reference range:

| Test | No. of Measurements | Mean (U) | Standard Deviation (U) | 5th Percentile (U) | 95th Percentile (U) | Reference Interval (U) |
| --- | --- | --- | --- | --- | --- | --- |
| ASPItest (0.5mM Arachidonic acid) | 260 | 63.4 | 14.8 | 40 | 91 | 40-91 |
| ADPtest (10μM ADP) | 259 | 67.1 | 14.3 | 43 | 92 | 43-92 |

N. Instrument Name:

Verum Multiplate 5.0

O. System Descriptions:

1. Modes of Operation:

The instrument is semi-automated. The software manages data collection.

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2. Software:

FDA has reviewed applicant’s Hazard Analysis and software development processes for this line of product types:

Yes ☐ x ☐ or No ☐

3. Specimen Identification:

A patient ID can be manually assigned using the patient ID option of the program menu.

4. Specimen Sampling and Handling:

300 µL each of NaCl/CaCl₂ diluent solution for the ADPtest or NaCl diluent for the ASPItest and the citrated whole blood sample are manually pipetted into the test cell.

5. Calibration:

Not applicable.

6. Quality Control:

The Multiplate analyzer is based on the detection of the change of electrical resistance during platelet aggregation. Two controls (solution 1 and 2) of different ionic strengths (50-75 AU and 100-140 AU respectively) are included as quality control material. An internal electronic quality control check is available to ensure electrical system performance.

P. Other Supportive Instrument Performance Characteristics Data Not Covered In the “Performance Characteristics” Section above:

Not applicable

Q. Proposed Labeling:

The labeling is sufficient and it satisfies the requirements of 21 CFR Part 809.10.

R. Conclusion:

The submitted information in this premarket notification is complete and supports substantial equivalence decision.

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