BACTEC MYCO/F LYTIC CULTURE VIALS

K970512 · Becton Dickinson Microbiology Systems · MDB · Jan 8, 1998 · Microbiology

Device Facts

• Record ID: K970512
• Device Name: BACTEC MYCO/F LYTIC CULTURE VIALS
• Applicant: Becton Dickinson Microbiology Systems
• Product Code: MDB · Microbiology
• Decision Date: Jan 8, 1998
• Decision: SESE
• Submission Type: Traditional
• Regulation: 21 CFR 866.2560
• Device Class: Class 1

Intended Use

BACTEC MYCO/F LYTIC when used with the BACTEC 9000MB instrument is a non-selective culture medium for the qualitative culture and recovery of mycobacteria from blood specimens.

Device Story

BACTEC MYCO/F LYTIC is a non-selective growth medium vial for mycobacteria recovery from 1-5 mL blood specimens. Used with BACTEC 9000MB instrument in clinical laboratories. Vial contains Middlebrook 7H9 and Brain Heart Infusion broth with fluorescence sensor. Principle of operation: sensor monitors oxygen concentration changes resulting from microbial metabolism; decreasing oxygen increases fluorescence. Instrument continuously monitors vials for fluorescence; positive result indicates presumptive presence of viable mycobacteria. Healthcare providers use output to identify mycobacterial infections in patients, including immunocompromised and transplant populations. Benefits include automated, non-invasive detection of mycobacteria in blood.

Clinical Evidence

Clinical study at two tertiary care hospitals compared BACTEC MYCO/F LYTIC to BACTEC 13A using 284 blood specimens. 39 pathogenic mycobacterial isolates recovered. 5 (13%) recovered in subject medium only; 2 (5%) in predicate only. False positive rate 0.4% (1/284); false negative rate 0% based on terminal subcultures. Contamination rate 0.9%. Internal bench testing evaluated recovery of 14 mycobacteria species at various CFU levels.

Technological Characteristics

Growth medium: Modified Middlebrook 7H9 and Brain Heart Infusion broth. Contains fluorescence sensor (O2-based). Dimensions: 1-5 mL blood capacity. Connectivity: Used with BACTEC 9000MB instrument. Monitoring: Non-invasive, fluorescent detection. Incubation: 37°C ± 1.5°C with internal agitation every 10 minutes.

Indications for Use

Indicated for the qualitative culture and recovery of mycobacteria in human blood specimens from patients suspected of having septicemia.

Regulatory Classification

Identification

A microbial growth monitor is a device intended for medical purposes that measures the concentration of bacteria suspended in a liquid medium by measuring changes in light scattering properties, optical density, electrical impedance, or by making direct bacterial counts. The device aids in the diagnosis of disease caused by pathogenic microorganisms.

Predicate Devices

• BACTEC 13A MYCOBACTERIA CULTURE MEDIUM

Reference Devices

• BACTEC MYCO/F Sputa culture medium

Submission Summary (Full Text)

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1410512

# 510(k) SUMMARY OF SAFETY AND EFFECTIVENESS

SUBMITTED BY: BECTON DICKINSON MICROBIOLOGY SYSTEMS
7 LOVETON CIRCLE
SPARKS, MD 21152
JAN - 8 1998

CONTACT: Dennis R. Mertz, Manager of Regulatory Affairs
TELEPHONE: [phone]
FAX: [phone]
PREPARED: December 23, 1997
DEVICE NAME: BACTEC MYCO/F LYTIC BLOOD CULTURE MEDIUM

DEVICE CLASSIFICATION: Monitor, Microbial Growth, Class I

PREDICATE DEVICE: BACTEC 13A MYCOBACTERIA CULTURE MEDIUM

INTENDED USE: BACTEC MYCO/F LYTIC when used with the BACTEC 9000MB instrument is a non-selective culture medium for the qualitative culture and recovery of mycobacteria from blood specimens.

DEVICE DESCRIPTION:

BACTEC MYCO/F LYTIC blood culture medium is a non-selective growth medium intended for the culture and recovery of mycobacteria and designed for blood volumes of one to five mL. BACTEC MYCO/F LYTIC culture medium is a Middlebrook 7H9 and Brain Heart Infusion broth formulation with specific formulation modifications made to enhance the growth of mycobacteria. It is used specifically with the BACTEC 9000MB instrument in the monitoring of clinical blood specimens for the presence of microorganisms. This medium contains the same fluorescence senor as the BACTEC MYCO/F Sputa culture medium and detection is based on changes in oxygen concentration in the vial resulting from metabolism and growth of microorganisms. The sensor is monitored by the BACTEC 9000MB System for increasing fluorescence which is proportional to the decrease in oxygen. A positive determination indicates the presumptive presence of viable microorganisms in the vial.

SUBSTANTIAL EQUIVALENCE:

Table 1 summarizes the similarities and differences between the BACTEC MYCO/F LYTIC Culture medium and the BACTEC 13A Mycobacteria culture medium.

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# INTERNAL PERFORMANCE:

A study was conducted to evaluate the recovery and time to detection of a variety of mycobacteria species at different CFU levels with the BACTEC MYCO/F LYTIC Culture medium. The following isolates were detected as positive in the BACTEC 9000MB instrument using BACTEC MYCO/F Lytic medium: *M. tuberculosis*, *M. kansasii*, *M. fortuitum*, *M. avium*, *M. intracellulare*, *M. bovis*, *M. terrae*, *M. simiae*, *M. gordonae*, *M. celatum*, *M. abscessus*, *M. malmoense*. During internal studies, *M. xenopi* and *M. szulgai* exhibited unsatisfactory recovery with BACTEC MYCO/F LYTIC culture medium. TABLE 2 describes the results of this study.

# CLINICAL PERFORMANCE:

The BACTEC MYCO/F Lytic culture medium was evaluated with the BACTEC 9000MB instrument at two clinical sites considered large tertiary care teaching hospitals in geographically diverse areas. The site populations included patients suspected of a mycobacterial infection, immunocompromised patients and transplant patients. The BACTEC MYCO/F Lytic culture medium was compared to the BACTEC 13A culture medium for the recovery and detection of mycobacteria from blood specimens. A total of 284 blood specimens were tested during the study. The total number of pathogenic mycobacterial isolates recovered in the study was 39 (See TABLE 1). Of these positives, five (13%) were recovered in the BACTEC MYCO/F Lytic culture medium only and two (5%) were recovered by BACTEC 13A culture medium only. A total of 28 BACTEC MYCO/F LYTIC vials were over filled with specimen (between 6 to 20 mL) during the clinical evaluation and were not included in this study since they were above the maximum fill volume. Of these 28 BACTEC MYCO/F LYTIC vials, 16 (57%) were identified as false positive.

Of the 284 blood specimens tested in the clinical study, one BACTEC MYCO/F LYTIC vial (0.4%) was determined to be false positive (instrument-positive, smear and/or subculture-negative). Of the 38 instrument positive MYCO/F LYTIC vials, 1 (2.6%) was determined to be false positive. The false negative rate (instrument-negative, smear and/or subculture-positive) was determined to be 0% based on terminal subcultures of 50% of negative vials. The contamination rate during this evaluation was determination to be 0.9%.

TABLE 1: SUMMARY OF MYCO/F LYTIC CULTURE MEDIUM ISOLATE RECOVERY DURING CLINICAL TRIALS

| Organism | Total Isolates | Myco/F Lytic Medium Only | 13A Medium Only | Both |
| --- | --- | --- | --- | --- |
| All Pathogenic Mycobacteria: | | | | |
| Mycobacterium avium | 30 | 3 | 1 | 26 |
| Mycobacterium tuberculosis | 6 | 0 | 0 | 6 |
| Mycobacterium kansasii | 3 | 2 | 1 | 0 |
| Total | 39 | 5 | 2 | 32 |

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Table 1. Substantial Equivalence of BACTEC MYCO/F LYTIC Culture Medium to BACTEC 13A

| | BACTEC MYCO/F LYTIC | BACTEC 13A |
| --- | --- | --- |
| Intended Use | Qualitative culture and recovery of mycobacteria | Qualitative culture and recovery of mycobacteria |
| Sample Type | Blood, unprocessed and other sterile body fluids | Blood, unprocessed |
| Sample Volume | 1 - 5 mL | 1 - 5 mL |
| Blood to Broth Ratio | 1 to 8 | 1 to 6 |
| Growth Medium | Modified Middlebrook 7H9 and enriched brain heart infusion broth | Modified Middlebrook 7H9 broth |
| Reactive ingredients: • Process water • Brain heart infusion • Soybean-Casein Digest • 7H9 Broth Base • Inositol • Casein Hydrolysate • Ferric Ammonium Citrate • Glycerol • Sodium Polysulfonate(SPS) • Tween 80(Polysorbate) • Saponin • L-Asparagine¹ • Catalase • Antifoam Agent • Hemin • ¹⁴C Substrate • Potassium Phosphate • Pyridoxal HCL • Ammonium Sulfate | 40mL 0.5%w/v 0.10%w/v 0.12%w/v 0.05%w/v 0.10%w/v 0.006%w/v 0.10%w/v 0.025%w/v 0.0025%w/v 0.24%w/v 0.10%w/v --- 0.01%w/v --- --- 0.024%w/v 0.0001%w/v --- | 30mL --- --- 0.47%w/v --- 0.10%w/v --- 0.025%w/v 0.02%w/v --- --- 1440 units --- --- 5μCi --- --- --- |
| Supplement | None | BACTEC Enrichment |
| Instrument | BACTEC 9000MB | BACTEC 460TB |
| Growth Detection | O₂ metabolism | Palmitate Decarboxylation |
| Incubation T°/mixing | 37°C ± 1.5°C; internal instrument agitation every 10 minutes | 37°C ± 1.5°C; no agitation by instrument |
| Type of Monitoring | Non-invasive, fluorescent detection | Invasive vial headspace sampling |
| Antimicrobial Supplement | None | None |

(Noted as Supplement H)

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Table 2

Detection of Mycobacteria in the Myco/F Lytic Medium.

BACTEC 9000MB

| | strain | cfu/bottle | 1 mL blood | 3 mL blood | 5 mL blood |
| --- | --- | --- | --- | --- | --- |
| *M. tuberculosis* | 582 | 0, 0 | 20.7 | 18.7 | 17.3 |
| Replicate | | | 25.0 | neg | neg |
| Average | | | 22.9 | 18.7 | 17.3 |
| *M. avium* | 2638 | 49, 45 | 7.8 | 8.1 | 8.1 |
| Replicate | | | 8.1 | 8.1 | 8.1 |
| Average | | | 8.0 | 8.1 | 8.1 |
| *M. intracellulare* | 2792 | 80, 44 | 25.8 | 16.7 | 10.5 |
| Replicate | | | 24.3 | 22.5 | 15.0 |
| Average | | | 25.0 | 19.6 | 12.8 |
| *M. fortuitum* | 3072 | 5, 0 | 9.1 | 5.6 | 5.0 |
| Replicate | | | 6.8 | 6.0 | 5.2 |
| Average | | | 8.0 | 5.8 | 5.1 |
| *M. bovis* | 2003 | 12, 13 | 24.4 | 20.0 | 20.0 |
| Replicate | | | 24.7 | 21.0 | 20.4 |
| Average | | | 24.5 | 20.5 | 20.2 |
| *M. kansasii* | 2205 | 7,3 | 12.3 | 14.3 | 14.3 |
| Replicate | | | 13.0 | 13.3 | neg |
| Average | | | 12.7 | 13.8 | 14.3 |
| *M. terrae* | 3001 | 0, 0 | 15.3 | 11.6 | 16.6 |
| Replicate | | | 17.0 | 32.4 | neg |
| Average | | | 16.2 | 22.0 | 16.6 |
| *M. szulgai* | 2353 | 1,2 | 15.7 | neg | neg |
| Replicate | | | neg | 22.7 | neg |
| Average | | | 15.7 | 22.7 | neg |
| *M. simiae* | 2304 | 68, 58 | 7.2 | 7.4 | 7.7 |
| Replicate | | | 7.2 | 7.5 | 7.4 |
| Average | | | 7.2 | 7.5 | 7.6 |
| *M. gordonae* | 2454 | 2, 5 | 26.4 | 28.7 | neg |
| Replicate | | | 24.0 | 32.0 | neg |
| Average | | | 25.2 | 30.4 | neg |
| *M. celatum* | 3661 | 53, 31 | 18.3 | 12.0 | 12.3 |
| Replicate | | | 18.3 | 15.0 | 12.3 |
| Average | | | 18.3 | 13.5 | 12.3 |
| *M. abscessus* | 3370 | 1, 0 | 4.9 | 4.4 | 3.9 |
| Replicate | | | 9.3 | 4.3 | neg |
| Average | | | 7.1 | 4.4 | 3.9 |
| *M. malmoense* | 3472 | 16, 20 | 30.0 | 21.5 | 10.8 |
| Replicate | | | 32.0 | 21.1 | 18.6 |
| Average | | | 31.0 | 21.3 | 14.7 |
| *M. haemophilum* | 5121 | 1, 1 | 36.1 | 23.0 | 18.4 |
| Replicate | | | 39.3 | 23.4 | 24.4 |
| Average | | | 37.7 | 23.2 | 21.4 |
| *M. xenopi* | 3052 | 0, 0 | neg | neg | neg |
| Replicate | | | neg | neg | neg |
| Average | | | neg | neg | neg |

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DEPARTMENT OF HEALTH & HUMAN SERVICES
Public Health Service
Food and Drug Administration
2098 Gaither Road
Rockville MD 20850
JAN - 8 1998

Mr. Dennis R. Mertz
Manager, Regulatory Affairs
Becton Dickinson Microbiology Systems
7 Loveton Circle
Sparks, Maryland 21152-0999

Re: K970512
Trade Name: BACTEC Myco/F Lytic Culture Vials
Regulatory Class: I
Product Code: MDB
Dated: October 20, 1997
Received: October 21, 1997

Dear Mr. Mertz:

We have reviewed your Section 510(k) notification of intent to market the device referenced above and we have determined the device is substantially equivalent (for the indications for use stated in the enclosure) to devices marketed in interstate commerce prior to May 28, 1976, the enactment date of the Medical Device Amendments or to devices that have been reclassified in accordance with the provisions of the Federal Food, Drug, and Cosmetic Act (Act). You may, therefore, market the device, subject to the general controls provisions of the Act. The general controls provisions of the Act include requirements for annual registration, listing of devices, good manufacturing practice, labeling, and prohibitions against misbranding and adulteration.

If your device is classified (see above) into either class II (Special Controls) or class III (Premarket Approval), it may be subject to such additional controls. Existing major regulations affecting your device can be found in the Code of Federal Regulations, Title 21, Parts 800 to 895. A substantially equivalent determination assumes compliance with the current Good Manufacturing Practice requirement, as set forth in the Quality System Regulation (QS) for Medical Devices: General regulation (21 CFR Part 820) and that, through periodic (QS) inspections, the Food and Drug Administration (FDA) will verify such assumptions. Failure to comply with the GMP regulation may result in regulatory action. In addition, FDA may publish further announcements concerning your device in the Federal Register. Please note: this response to your premarket notification submission does not affect any obligation you might have under sections 531 through 542 of the Act for devices under the Electronic Product Radiation Control provisions, or other Federal Laws or Regulations.

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Page 2

Under the Clinical Laboratory Improvement Amendments of 1988 (CLIA-88), this device may require a CLIA complexity categorization. To determine if it does, you should contact the Centers for Disease Control and Prevention (CDC) at [phone].

This letter will allow you to begin marketing your device as described in your 510(k) premarket notification. The FDA finding of substantial equivalence of your device to a legally marketed predicate device results in a classification for your device and thus, permits your device to proceed to the market.

If you desire specific advice for your device on our labeling regulation (21 CFR Part 801 and additionally 809.10 for *in vitro* diagnostic devices), please contact the Office of Compliance at [phone]. Additionally, for questions on the promotion and advertising of your device, please contact the Office of Compliance at [phone]. Also, please note the regulation entitled, "Misbranding by reference to premarket notification" (21 CFR 807.97). Other general information on your responsibilities under the Act may be obtained from the Division of Small Manufacturers Assistance at its toll free number [phone] or at [phone] or at its internet address "http://www.fda.gov/cdrh/dsmamain.html"

Sincerely yours,

Steven I. Gutman, M.D., M.B.A.
Director
Division of Clinical Laboratory Devices
Office of Device Evaluation
Center for Devices and Radiological Health

Enclosure

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Page ___ of ___

510(k) Number (if known): K970512

Device Name: Myco/F Lytic Culture Vials

Indications For Use:

The BACTEC ® MYCO/F LYTIC Culture vial when used with the BACTEC 9000MB System is a qualitative test for the culture and recovery of mycobacteria in human blood specimens from patients who are suspected of having septicemia.

(PLEASE DO NOT WRITE BELOW THIS LINE-CONTINUE ON ANOTHER PAGE IF NEEDED)

Concurrence of CDRH, Office of Device Evaluation (ODE)

John Ticohurst MD 1/6/98
(Division Sign-Off) Interim Chief, Microbiology
Division of Clinical Laboratory Devices
510(k) Number K970512

Prescription Use ☑
(Per 21 CFR 801.109)

OR

Over-The-Counter Use ☐
(Optional Format 1-2-96)